create copy

161 files changed, 19919 insertions, 0 deletions

diff --git a/ports/stm/.gitignore b/ports/stm/.gitignore
new file mode 100644
index 000000000..3080ece14
--- /dev/null
+++ b/ports/stm/.gitignore
@@ -0,0 +1,9 @@
+# Build files
+#####################
+build-*/
+
+# Reference files
+#####################
+ref/
+
+.gdb_history
\ No newline at end of file
diff --git a/ports/stm/Makefile b/ports/stm/Makefile
new file mode 100755
index 000000000..3a6191c85
--- /dev/null
+++ b/ports/stm/Makefile
@@ -0,0 +1,284 @@
+# This file is part of the MicroPython project, http://micropython.org/
+#
+# The MIT License (MIT)
+#
+# Copyright (c) 2019 Dan Halbert for Adafruit Industries
+# Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+# DEBUG = 1
+
+# Select the board to build for.
+ifeq ($(BOARD),)
+	$(error You must provide a BOARD parameter)
+else
+	ifeq ($(wildcard boards/$(BOARD)/.),)
+		$(error Invalid BOARD specified)
+	endif
+endif
+
+# If the build directory is not given, make it reflect the board name.
+BUILD ?= build-$(BOARD)
+
+include ../../py/mkenv.mk
+# Board-specific
+include boards/$(BOARD)/mpconfigboard.mk
+# Port-specific
+include mpconfigport.mk
+
+# CircuitPython-specific
+include $(TOP)/py/circuitpy_mpconfig.mk
+
+# qstr definitions (must come before including py.mk)
+QSTR_DEFS = qstrdefsport.h
+
+# include py core make definitions
+include $(TOP)/py/py.mk
+
+include $(TOP)/supervisor/supervisor.mk
+
+# Include make rules and variables common across CircuitPython builds.
+include $(TOP)/py/circuitpy_defns.mk
+
+CROSS_COMPILE = arm-none-eabi-
+
+#######################################
+# CFLAGS
+#######################################
+
+INC += -I.
+INC += -I../..
+INC += -I$(BUILD)
+INC += -I$(BUILD)/genhdr
+INC += -I./stm32f4/STM32F4xx_HAL_Driver/Inc
+INC += -I./stm32f4/STM32F4xx_HAL_Driver/Inc/Legacy
+INC += -I./stm32f4/CMSIS/Device/ST/STM32F4xx/Include
+INC += -I./stm32f4/CMSIS/Include
+INC += -I./boards
+INC += -I./boards/$(BOARD)
+INC += -I./peripherals
+INC += -I../../lib/mp-readline
+INC += -I../../lib/tinyusb/src
+INC += -I../../supervisor/shared/usb
+
+
+#Debugging/Optimization
+ifeq ($(DEBUG), 1)
+	CFLAGS += -ggdb
+	# You may want to enable these flags to make setting breakpoints easier.
+	CFLAGS += -fno-inline -fno-ipa-sra
+else
+	CFLAGS += -Os -DNDEBUG
+	CFLAGS += -ggdb
+	# TODO: Test with -flto
+	### CFLAGS += -flto
+endif
+
+
+C_DEFS = -DMCU_PACKAGE=$(MCU_PACKAGE) -DUSE_HAL_DRIVER -DUSE_FULL_LL_DRIVER -D$(CMSIS_MCU)
+
+CFLAGS += $(INC) -Werror -Wall -std=gnu11 -nostdlib $(BASE_CFLAGS) $(C_DEFS) $(CFLAGS_MOD) $(COPT)
+
+# Undo some warnings.
+# STM32 apparently also uses undefined preprocessor variables quite casually,
+# so we can't do warning checks for these.
+CFLAGS += -Wno-undef
+# STM32 might do casts that increase alignment requirements.
+CFLAGS += -Wno-cast-align
+
+CFLAGS += \
+	-mthumb \
+	-mabi=aapcs-linux \
+	-mfloat-abi=hard \
+	-mcpu=cortex-m4 \
+	-mfpu=fpv4-sp-d16
+
+# TODO: check this
+CFLAGS += -D__START=main
+
+#need both command and valid file to use uf2 bootloader
+ifndef LD_FILE
+    ifneq ($(and $(UF2_BOOTLOADER),$(LD_BOOT)),)
+        LD_FILE = $(LD_BOOT)
+        BOOTLOADER_OFFSET = $(UF2_OFFSET)
+        CFLAGS += -DUF2_BOOTLOADER_ENABLED
+    else
+        LD_FILE = $(LD_DEFAULT)
+    endif
+endif
+
+# Add bootloader specific items
+ifndef BOOTLOADER_OFFSET
+	BOOTLOADER_OFFSET := 0x8000000
+endif
+
+LDFLAGS = $(CFLAGS) -fshort-enums -Wl,-nostdlib -Wl,-T,$(LD_FILE) -Wl,-Map=$@.map -Wl,-cref -Wl,-gc-sections -specs=nano.specs
+LIBS := -lgcc -lc
+
+LDFLAGS += -mthumb -mcpu=cortex-m4
+
+# Use toolchain libm if we're not using our own.
+ifndef INTERNAL_LIBM
+LIBS += -lm
+endif
+
+# TinyUSB defines
+CFLAGS += -DCFG_TUSB_MCU=OPT_MCU_STM32F4 -DCFG_TUD_CDC_RX_BUFSIZE=1024 -DCFG_TUD_CDC_TX_BUFSIZE=1024 -DCFG_TUD_MSC_BUFSIZE=4096 -DCFG_TUD_MIDI_RX_BUFSIZE=128 -DCFG_TUD_MIDI_TX_BUFSIZE=128
+
+
+######################################
+# source
+######################################
+
+SRC_STM32 = \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_adc.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_adc_ex.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dac.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dac_ex.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c_ex.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_qspi.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rng.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rtc.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rtc_ex.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_spi.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_tim.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_tim_ex.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_uart.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_usart.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rcc.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rcc_ex.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash_ex.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash_ramfunc.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_gpio.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dma_ex.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dma.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr_ex.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_cortex.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_exti.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_sd.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_gpio.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_adc.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_usb.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_fsmc.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_i2c.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_dma.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_sdmmc.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_usart.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_rcc.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_utils.c \
+	stm32f4/STM32F4xx_HAL_Driver/Src/stm32f4xx_ll_exti.c \
+	system_stm32f4xx.c
+
+
+SRC_C += \
+	background.c \
+	fatfs_port.c \
+	mphalport.c \
+	tick.c \
+	boards/$(BOARD)/board.c \
+	boards/$(BOARD)/pins.c \
+	peripherals/stm32f4/$(MCU_SUB_VARIANT)/pins.c \
+	peripherals/stm32f4/$(MCU_SUB_VARIANT)/clocks.c \
+	peripherals/stm32f4/$(MCU_SUB_VARIANT)/gpio.c \
+	peripherals/stm32f4/$(MCU_SUB_VARIANT)/periph.c \
+	lib/libc/string0.c \
+	lib/mp-readline/readline.c \
+	lib/oofatfs/ff.c \
+	lib/oofatfs/option/ccsbcs.c \
+	lib/timeutils/timeutils.c \
+	lib/utils/buffer_helper.c \
+	lib/utils/context_manager_helpers.c \
+	lib/utils/interrupt_char.c \
+	lib/utils/pyexec.c \
+	lib/utils/stdout_helpers.c \
+	lib/utils/sys_stdio_mphal.c \
+	supervisor/shared/memory.c
+
+ifneq ($(USB),FALSE)
+SRC_C += lib/tinyusb/src/portable/st/synopsys/dcd_synopsys.c
+endif
+
+SRC_S = \
+	supervisor/cpu.s \
+	boards/startup_$(MCU_SUB_VARIANT).s
+
+SRC_COMMON_HAL_EXPANDED = $(addprefix shared-bindings/, $(SRC_COMMON_HAL)) \
+						  $(addprefix shared-bindings/, $(SRC_BINDINGS_ENUMS)) \
+						  $(addprefix common-hal/, $(SRC_COMMON_HAL))
+
+SRC_SHARED_MODULE_EXPANDED = $(addprefix shared-bindings/, $(SRC_SHARED_MODULE)) \
+							 $(addprefix shared-module/, $(SRC_SHARED_MODULE)) \
+							 $(addprefix shared-module/, $(SRC_SHARED_MODULE_INTERNAL))
+
+
+ifneq ($(FROZEN_MPY_DIR),)
+FROZEN_MPY_PY_FILES := $(shell find -L $(FROZEN_MPY_DIR) -type f -name '*.py')
+FROZEN_MPY_MPY_FILES := $(addprefix $(BUILD)/,$(FROZEN_MPY_PY_FILES:.py=.mpy))
+endif
+
+OBJ += $(PY_O) $(SUPERVISOR_O) $(addprefix $(BUILD)/, $(SRC_C:.c=.o))
+OBJ += $(addprefix $(BUILD)/, $(SRC_STM32:.c=.o))
+OBJ += $(addprefix $(BUILD)/, $(SRC_COMMON_HAL_EXPANDED:.c=.o))
+OBJ += $(addprefix $(BUILD)/, $(SRC_SHARED_MODULE_EXPANDED:.c=.o))
+ifeq ($(INTERNAL_LIBM),1)
+OBJ += $(addprefix $(BUILD)/, $(SRC_LIBM:.c=.o))
+endif
+OBJ += $(addprefix $(BUILD)/, $(SRC_S:.s=.o))
+OBJ += $(addprefix $(BUILD)/, $(SRC_MOD:.c=.o))
+
+$(BUILD)/$(FATFS_DIR)/ff.o: COPT += -Os
+$(filter $(PY_BUILD)/../extmod/vfs_fat_%.o, $(PY_O)): COPT += -Os
+
+# List of sources for qstr extraction
+SRC_QSTR += $(SRC_C) $(SRC_SUPERVISOR) $(SRC_MOD) $(SRC_COMMON_HAL_EXPANDED) $(SRC_SHARED_MODULE_EXPANDED)
+# Sources that only hold QSTRs after pre-processing.
+SRC_QSTR_PREPROCESSOR +=
+
+
+all: $(BUILD)/firmware.bin $(BUILD)/firmware.uf2
+
+$(BUILD)/firmware.elf: $(OBJ)
+	$(STEPECHO) "LINK $@"
+	$(Q)$(CC) -o $@ $(LDFLAGS) $^ -Wl,--start-group $(LIBS) -Wl,--end-group
+	$(Q)$(SIZE) $@ | $(PYTHON3) $(TOP)/tools/build_memory_info.py $(LD_FILE)
+
+$(BUILD)/firmware.bin: $(BUILD)/firmware.elf
+	$(STEPECHO) "Create $@"
+	$(Q)$(OBJCOPY) -O binary $^ $@
+#   $(Q)$(OBJCOPY) -O binary -j .vectors -j .text -j .data $^ $@
+
+$(BUILD)/firmware.hex: $(BUILD)/firmware.elf
+	$(STEPECHO) "Create $@"
+	$(Q)$(OBJCOPY) -O ihex $^ $@
+#   $(Q)$(OBJCOPY) -O ihex -j .vectors -j .text -j .data $^ $@
+
+$(BUILD)/firmware.uf2: $(BUILD)/firmware.hex
+	$(ECHO) "Create $@"
+	$(PYTHON3) $(TOP)/tools/uf2/utils/uf2conv.py -f 0x57755a57 -b $(BOOTLOADER_OFFSET) -c -o "$(BUILD)/firmware.uf2" $^
+
+include $(TOP)/py/mkrules.mk
+
+# Print out the value of a make variable.
+# https://stackoverflow.com/questions/16467718/how-to-print-out-a-variable-in-makefile
+print-%:
+	@echo $* = $($*)
diff --git a/ports/stm/README.md b/ports/stm/README.md
new file mode 100644
index 000000000..a860c01ce
--- /dev/null
+++ b/ports/stm/README.md
@@ -0,0 +1,3 @@
+# CircuitPython Port To The ST Microelectronics STM32F4 Series
+
+This is a port of CircuitPython to the STM32F4 series of chips. 
diff --git a/ports/stm/background.c b/ports/stm/background.c
new file mode 100644
index 000000000..8c1897043
--- /dev/null
+++ b/ports/stm/background.c
@@ -0,0 +1,60 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/runtime.h"
+#include "supervisor/filesystem.h"
+#include "supervisor/usb.h"
+#include "supervisor/shared/stack.h"
+
+#if CIRCUITPY_DISPLAYIO
+#include "shared-module/displayio/__init__.h"
+#endif
+
+static bool running_background_tasks = false;
+
+void background_tasks_reset(void) {
+    running_background_tasks = false;
+}
+
+void run_background_tasks(void) {
+    // Don't call ourselves recursively.
+    if (running_background_tasks) {
+        return;
+    }
+    running_background_tasks = true;
+    filesystem_background();
+
+    #if USB_AVAILABLE
+    usb_background();
+    #endif
+
+    #if CIRCUITPY_DISPLAYIO
+    displayio_background();
+    #endif
+    running_background_tasks = false;
+
+    assert_heap_ok();
+}
diff --git a/ports/stm/background.h b/ports/stm/background.h
new file mode 100644
index 000000000..05a4f894a
--- /dev/null
+++ b/ports/stm/background.h
@@ -0,0 +1,35 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Dan Halbert for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_BACKGROUND_H
+#define MICROPY_INCLUDED_STM32F4_BACKGROUND_H
+
+#include <stdbool.h>
+
+void background_tasks_reset(void);
+void run_background_tasks(void);
+
+#endif  // MICROPY_INCLUDED_STM32F4_BACKGROUND_H
diff --git a/ports/stm/boards/STM32F401xd_fs.ld b/ports/stm/boards/STM32F401xd_fs.ld
new file mode 100644
index 000000000..c42dfcca8
--- /dev/null
+++ b/ports/stm/boards/STM32F401xd_fs.ld
@@ -0,0 +1,107 @@
+/*
+    GNU linker script for STM32F401 with bootloader (such as the Meowbit)
+*/
+
+/* Specify the memory areas */
+MEMORY
+{
+    FLASH (rx)      : ORIGIN = 0x08000000, LENGTH = 384K /* entire flash */
+    FLASH_ISR (rx)  : ORIGIN = 0x08000000, LENGTH = 16K /* sector 0 */
+    FLASH_FS (rx)   : ORIGIN = 0x08004000, LENGTH = 48K /* sectors 1,2,3 are 16K */
+    FLASH_TEXT (rx) : ORIGIN = 0x08010000, LENGTH = 320K /* sector 4 is 64K, sectors 5,6,7 are 128K */
+    RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 96K
+}
+
+/* produce a link error if there is not this amount of RAM for these sections */
+_minimum_stack_size = 2K;
+_minimum_heap_size = 16K;
+
+/* Define tho top end of the stack.  The stack is full descending so begins just
+   above last byte of RAM.  Note that EABI requires the stack to be 8-byte
+   aligned for a call. */
+_estack = ORIGIN(RAM) + LENGTH(RAM);
+
+/* RAM extents for the garbage collector */
+_ram_start = ORIGIN(RAM);
+_ram_end = ORIGIN(RAM) + LENGTH(RAM);
+
+ENTRY(Reset_Handler)
+
+/* define output sections */
+SECTIONS
+{
+    /* The startup code goes first into FLASH */
+    .isr_vector :
+    {
+        . = ALIGN(4);
+        KEEP(*(.isr_vector)) /* Startup code */
+
+        /* This first flash block is 16K annd the isr vectors only take up
+           about 400 bytes. Micropython pads this with files, but this didn't
+           work with the size of Circuitpython's ff object. */
+
+        . = ALIGN(4);
+    } >FLASH_ISR
+
+    /* The program code and other data goes into FLASH */
+    .text :
+    {
+        . = ALIGN(4);
+        *(.text*)          /* .text* sections (code) */
+        *(.rodata*)        /* .rodata* sections (constants, strings, etc.) */
+    /*  *(.glue_7)   */    /* glue arm to thumb code */
+    /*  *(.glue_7t)  */    /* glue thumb to arm code */
+
+        . = ALIGN(4);
+        _etext = .;        /* define a global symbol at end of code */
+    } >FLASH_TEXT
+
+    /* used by the startup to initialize data */
+    _sidata = LOADADDR(.data);
+
+    /* This is the initialized data section
+    The program executes knowing that the data is in the RAM
+    but the loader puts the initial values in the FLASH (inidata).
+    It is one task of the startup to copy the initial values from FLASH to RAM. */
+    .data :
+    {
+        . = ALIGN(4);
+        _sdata = .;        /* create a global symbol at data start; used by startup code in order to initialise the .data section in RAM */
+        *(.data*)          /* .data* sections */
+
+        . = ALIGN(4);
+        _edata = .;        /* define a global symbol at data end; used by startup code in order to initialise the .data section in RAM */
+    } >RAM AT> FLASH_TEXT
+
+    /* Uninitialized data section */
+    .bss :
+    {
+        . = ALIGN(4);
+        _sbss = .;         /* define a global symbol at bss start; used by startup code */
+        *(.bss*)
+        *(COMMON)
+
+        . = ALIGN(4);
+        _ebss = .;         /* define a global symbol at bss end; used by startup code and GC */
+    } >RAM
+
+    /* this is to define the start of the heap, and make sure we have a minimum size */
+    .heap :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_heap_size;
+        . = ALIGN(4);
+    } >RAM
+
+    /* this just checks there is enough RAM for the stack */
+    .stack :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_stack_size;
+        . = ALIGN(4);
+    } >RAM
+
+    .ARM.attributes 0 : { *(.ARM.attributes) }
+}
+
+
diff --git a/ports/stm/boards/STM32F401xe_boot.ld b/ports/stm/boards/STM32F401xe_boot.ld
new file mode 100644
index 000000000..125d785fc
--- /dev/null
+++ b/ports/stm/boards/STM32F401xe_boot.ld
@@ -0,0 +1,106 @@
+/*
+    GNU linker script for STM32F401 with bootloader (such as the Meowbit)
+*/
+
+/* Specify the memory areas */
+MEMORY
+{
+    FLASH (rx)      : ORIGIN = 0x08010000, LENGTH = 512K - 64K  /* entire flash, sans bootloader region */
+    FLASH_ISR (rx)  : ORIGIN = 0x08010000, LENGTH = 64K         /* sector 4 */
+    FLASH_TEXT (rx) : ORIGIN = 0x08020000, LENGTH = 384K        /* sectors 5,6,7 are 128K */
+    RAM (xrw)       : ORIGIN = 0x20000194, LENGTH = 96K - 0x194
+}
+
+/* produce a link error if there is not this amount of RAM for these sections */
+_minimum_stack_size = 2K;
+_minimum_heap_size = 16K;
+
+/* Define tho top end of the stack.  The stack is full descending so begins just
+   above last byte of RAM.  Note that EABI requires the stack to be 8-byte
+   aligned for a call. */
+_estack = ORIGIN(RAM) + LENGTH(RAM);
+
+/* RAM extents for the garbage collector */
+_ram_start = ORIGIN(RAM);
+_ram_end = ORIGIN(RAM) + LENGTH(RAM);
+
+ENTRY(Reset_Handler)
+
+/* define output sections */
+SECTIONS
+{
+    /* The startup code goes first into FLASH */
+    .isr_vector :
+    {
+        . = ALIGN(4);
+        KEEP(*(.isr_vector)) /* Startup code */
+
+        /* This first flash block is 16K annd the isr vectors only take up
+           about 400 bytes. Micropython pads this with files, but this didn't
+           work with the size of Circuitpython's ff object. */
+
+        . = ALIGN(4);
+    } >FLASH_ISR
+
+    /* The program code and other data goes into FLASH */
+    .text :
+    {
+        . = ALIGN(4);
+        *(.text*)          /* .text* sections (code) */
+        *(.rodata*)        /* .rodata* sections (constants, strings, etc.) */
+    /*  *(.glue_7)   */    /* glue arm to thumb code */
+    /*  *(.glue_7t)  */    /* glue thumb to arm code */
+
+        . = ALIGN(4);
+        _etext = .;        /* define a global symbol at end of code */
+    } >FLASH_TEXT
+
+    /* used by the startup to initialize data */
+    _sidata = LOADADDR(.data);
+
+    /* This is the initialized data section
+    The program executes knowing that the data is in the RAM
+    but the loader puts the initial values in the FLASH (inidata).
+    It is one task of the startup to copy the initial values from FLASH to RAM. */
+    .data :
+    {
+        . = ALIGN(4);
+        _sdata = .;        /* create a global symbol at data start; used by startup code in order to initialise the .data section in RAM */
+        *(.data*)          /* .data* sections */
+
+        . = ALIGN(4);
+        _edata = .;        /* define a global symbol at data end; used by startup code in order to initialise the .data section in RAM */
+    } >RAM AT> FLASH_TEXT
+
+    /* Uninitialized data section */
+    .bss :
+    {
+        . = ALIGN(4);
+        _sbss = .;         /* define a global symbol at bss start; used by startup code */
+        *(.bss*)
+        *(COMMON)
+
+        . = ALIGN(4);
+        _ebss = .;         /* define a global symbol at bss end; used by startup code and GC */
+    } >RAM
+
+    /* this is to define the start of the heap, and make sure we have a minimum size */
+    .heap :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_heap_size;
+        . = ALIGN(4);
+    } >RAM
+
+    /* this just checks there is enough RAM for the stack */
+    .stack :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_stack_size;
+        . = ALIGN(4);
+    } >RAM
+
+    .ARM.attributes 0 : { *(.ARM.attributes) }
+}
+
+
diff --git a/ports/stm/boards/STM32F401xe_fs.ld b/ports/stm/boards/STM32F401xe_fs.ld
new file mode 100644
index 000000000..fd30e1622
--- /dev/null
+++ b/ports/stm/boards/STM32F401xe_fs.ld
@@ -0,0 +1,107 @@
+/*
+    GNU linker script for STM32F401 with bootloader (such as the Meowbit)
+*/
+
+/* Specify the memory areas */
+MEMORY
+{
+    FLASH (rx)      : ORIGIN = 0x08000000, LENGTH = 512K /* entire flash */
+    FLASH_ISR (rx)  : ORIGIN = 0x08000000, LENGTH = 16K /* sector 0 */
+    FLASH_FS (rx)   : ORIGIN = 0x08004000, LENGTH = 48K /* sectors 1,2,3 are 16K */
+    FLASH_TEXT (rx) : ORIGIN = 0x08010000, LENGTH = 448K /* sector 4 is 64K, sectors 5,6,7 are 128K */
+    RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 96K
+}
+
+/* produce a link error if there is not this amount of RAM for these sections */
+_minimum_stack_size = 2K;
+_minimum_heap_size = 16K;
+
+/* Define tho top end of the stack.  The stack is full descending so begins just
+   above last byte of RAM.  Note that EABI requires the stack to be 8-byte
+   aligned for a call. */
+_estack = ORIGIN(RAM) + LENGTH(RAM);
+
+/* RAM extents for the garbage collector */
+_ram_start = ORIGIN(RAM);
+_ram_end = ORIGIN(RAM) + LENGTH(RAM);
+
+ENTRY(Reset_Handler)
+
+/* define output sections */
+SECTIONS
+{
+    /* The startup code goes first into FLASH */
+    .isr_vector :
+    {
+        . = ALIGN(4);
+        KEEP(*(.isr_vector)) /* Startup code */
+
+        /* This first flash block is 16K annd the isr vectors only take up
+           about 400 bytes. Micropython pads this with files, but this didn't
+           work with the size of Circuitpython's ff object. */
+
+        . = ALIGN(4);
+    } >FLASH_ISR
+
+    /* The program code and other data goes into FLASH */
+    .text :
+    {
+        . = ALIGN(4);
+        *(.text*)          /* .text* sections (code) */
+        *(.rodata*)        /* .rodata* sections (constants, strings, etc.) */
+    /*  *(.glue_7)   */    /* glue arm to thumb code */
+    /*  *(.glue_7t)  */    /* glue thumb to arm code */
+
+        . = ALIGN(4);
+        _etext = .;        /* define a global symbol at end of code */
+    } >FLASH_TEXT
+
+    /* used by the startup to initialize data */
+    _sidata = LOADADDR(.data);
+
+    /* This is the initialized data section
+    The program executes knowing that the data is in the RAM
+    but the loader puts the initial values in the FLASH (inidata).
+    It is one task of the startup to copy the initial values from FLASH to RAM. */
+    .data :
+    {
+        . = ALIGN(4);
+        _sdata = .;        /* create a global symbol at data start; used by startup code in order to initialise the .data section in RAM */
+        *(.data*)          /* .data* sections */
+
+        . = ALIGN(4);
+        _edata = .;        /* define a global symbol at data end; used by startup code in order to initialise the .data section in RAM */
+    } >RAM AT> FLASH_TEXT
+
+    /* Uninitialized data section */
+    .bss :
+    {
+        . = ALIGN(4);
+        _sbss = .;         /* define a global symbol at bss start; used by startup code */
+        *(.bss*)
+        *(COMMON)
+
+        . = ALIGN(4);
+        _ebss = .;         /* define a global symbol at bss end; used by startup code and GC */
+    } >RAM
+
+    /* this is to define the start of the heap, and make sure we have a minimum size */
+    .heap :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_heap_size;
+        . = ALIGN(4);
+    } >RAM
+
+    /* this just checks there is enough RAM for the stack */
+    .stack :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_stack_size;
+        . = ALIGN(4);
+    } >RAM
+
+    .ARM.attributes 0 : { *(.ARM.attributes) }
+}
+
+
diff --git a/ports/stm/boards/STM32F405_boot.ld b/ports/stm/boards/STM32F405_boot.ld
new file mode 100644
index 000000000..64da3b652
--- /dev/null
+++ b/ports/stm/boards/STM32F405_boot.ld
@@ -0,0 +1,107 @@
+/*
+    GNU linker script for STM32F405 with bootloader
+    Based on Micropython
+*/
+
+/* Specify the memory areas */
+MEMORY
+{
+    FLASH (rx)      : ORIGIN = 0x08010000, LENGTH = 1024K - 64K         /* entire flash, sans bootloader region */
+    FLASH_ISR (rx)  : ORIGIN = 0x08010000, LENGTH = 64K                 /* sector 0 */
+    FLASH_TEXT (rx) : ORIGIN = 0x08020000, LENGTH = 1024K - 64K - 64K   /* sectors 5+ */
+    CCMRAM (xrw)    : ORIGIN = 0x10000000, LENGTH = 64K
+    RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 128K
+}
+
+/* produce a link error if there is not this amount of RAM for these sections */
+_minimum_stack_size = 2K;
+_minimum_heap_size = 16K;
+
+/* Define the top end of the stack.  The stack is full descending so begins just
+   above last byte of RAM.  Note that EABI requires the stack to be 8-byte
+   aligned for a call. */
+_estack = ORIGIN(RAM) + LENGTH(RAM);
+
+/* RAM extents for the garbage collector */
+_ram_start = ORIGIN(RAM);
+_ram_end = ORIGIN(RAM) + LENGTH(RAM);
+
+ENTRY(Reset_Handler)
+
+/* define output sections */
+SECTIONS
+{
+    /* The startup code goes first into FLASH */
+    .isr_vector :
+    {
+        . = ALIGN(4);
+        KEEP(*(.isr_vector)) /* Startup code */
+
+        /* This first flash block is 16K annd the isr vectors only take up
+           about 400 bytes. Micropython pads this with files, but this didn't
+           work with the size of Circuitpython's ff object. */
+
+        . = ALIGN(4);
+    } >FLASH_ISR
+
+    /* The program code and other data goes into FLASH */
+    .text :
+    {
+        . = ALIGN(4);
+        *(.text*)          /* .text* sections (code) */
+        *(.rodata*)        /* .rodata* sections (constants, strings, etc.) */
+    /*  *(.glue_7)   */    /* glue arm to thumb code */
+    /*  *(.glue_7t)  */    /* glue thumb to arm code */
+
+        . = ALIGN(4);
+        _etext = .;        /* define a global symbol at end of code */
+    } >FLASH_TEXT
+
+    /* used by the startup to initialize data */
+    _sidata = LOADADDR(.data);
+
+    /* This is the initialized data section
+    The program executes knowing that the data is in the RAM
+    but the loader puts the initial values in the FLASH (inidata).
+    It is one task of the startup to copy the initial values from FLASH to RAM. */
+    .data :
+    {
+        . = ALIGN(4);
+        _sdata = .;        /* create a global symbol at data start; used by startup code in order to initialise the .data section in RAM */
+        *(.data*)          /* .data* sections */
+
+        . = ALIGN(4);
+        _edata = .;        /* define a global symbol at data end; used by startup code in order to initialise the .data section in RAM */
+    } >RAM AT> FLASH_TEXT
+
+    /* Uninitialized data section */
+    .bss :
+    {
+        . = ALIGN(4);
+        _sbss = .;         /* define a global symbol at bss start; used by startup code */
+        *(.bss*)
+        *(COMMON)
+
+        . = ALIGN(4);
+        _ebss = .;         /* define a global symbol at bss end; used by startup code and GC */
+    } >RAM
+
+    /* this is to define the start of the heap, and make sure we have a minimum size */
+    .heap :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_heap_size;
+        . = ALIGN(4);
+    } >RAM
+
+    /* this just checks there is enough RAM for the stack */
+    .stack :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_stack_size;
+        . = ALIGN(4);
+    } >RAM
+
+    .ARM.attributes 0 : { *(.ARM.attributes) }
+}
+
diff --git a/ports/stm/boards/STM32F405_default.ld b/ports/stm/boards/STM32F405_default.ld
new file mode 100644
index 000000000..c2b8c843e
--- /dev/null
+++ b/ports/stm/boards/STM32F405_default.ld
@@ -0,0 +1,107 @@
+/*
+    GNU linker script for STM32F405 via Micropython
+*/
+
+/* Specify the memory areas */
+MEMORY
+{
+    FLASH (rx)      : ORIGIN = 0x08000000, LENGTH = 1024K /* entire flash */
+    FLASH_ISR (rx)  : ORIGIN = 0x08000000, LENGTH = 16K /* sector 0 */
+    FLASH_TEXT (rx) : ORIGIN = 0x08004000, LENGTH = 1008K /* sectors 0-7*/
+    CCMRAM (xrw)    : ORIGIN = 0x10000000, LENGTH = 64K
+    RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 128K
+}
+
+/* produce a link error if there is not this amount of RAM for these sections */
+_minimum_stack_size = 2K;
+_minimum_heap_size = 16K;
+
+/* Define tho top end of the stack.  The stack is full descending so begins just
+   above last byte of RAM.  Note that EABI requires the stack to be 8-byte
+   aligned for a call. */
+_estack = ORIGIN(RAM) + LENGTH(RAM);
+
+/* RAM extents for the garbage collector */
+_ram_start = ORIGIN(RAM);
+_ram_end = ORIGIN(RAM) + LENGTH(RAM);
+
+ENTRY(Reset_Handler)
+
+/* define output sections */
+SECTIONS
+{
+    /* The startup code goes first into FLASH */
+    .isr_vector :
+    {
+        . = ALIGN(4);
+        KEEP(*(.isr_vector)) /* Startup code */
+
+        /* This first flash block is 16K annd the isr vectors only take up
+           about 400 bytes. Micropython pads this with files, but this didn't
+           work with the size of Circuitpython's ff object. */
+
+        . = ALIGN(4);
+    } >FLASH_ISR
+
+    /* The program code and other data goes into FLASH */
+    .text :
+    {
+        . = ALIGN(4);
+        *(.text*)          /* .text* sections (code) */
+        *(.rodata*)        /* .rodata* sections (constants, strings, etc.) */
+    /*  *(.glue_7)   */    /* glue arm to thumb code */
+    /*  *(.glue_7t)  */    /* glue thumb to arm code */
+
+        . = ALIGN(4);
+        _etext = .;        /* define a global symbol at end of code */
+    } >FLASH_TEXT
+
+    /* used by the startup to initialize data */
+    _sidata = LOADADDR(.data);
+
+    /* This is the initialized data section
+    The program executes knowing that the data is in the RAM
+    but the loader puts the initial values in the FLASH (inidata).
+    It is one task of the startup to copy the initial values from FLASH to RAM. */
+    .data :
+    {
+        . = ALIGN(4);
+        _sdata = .;        /* create a global symbol at data start; used by startup code in order to initialise the .data section in RAM */
+        *(.data*)          /* .data* sections */
+
+        . = ALIGN(4);
+        _edata = .;        /* define a global symbol at data end; used by startup code in order to initialise the .data section in RAM */
+    } >RAM AT> FLASH_TEXT
+
+    /* Uninitialized data section */
+    .bss :
+    {
+        . = ALIGN(4);
+        _sbss = .;         /* define a global symbol at bss start; used by startup code */
+        *(.bss*)
+        *(COMMON)
+
+        . = ALIGN(4);
+        _ebss = .;         /* define a global symbol at bss end; used by startup code and GC */
+    } >RAM
+
+    /* this is to define the start of the heap, and make sure we have a minimum size */
+    .heap :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_heap_size;
+        . = ALIGN(4);
+    } >RAM
+
+    /* this just checks there is enough RAM for the stack */
+    .stack :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_stack_size;
+        . = ALIGN(4);
+    } >RAM
+
+    .ARM.attributes 0 : { *(.ARM.attributes) }
+}
+
+
diff --git a/ports/stm/boards/STM32F405_fs.ld b/ports/stm/boards/STM32F405_fs.ld
new file mode 100644
index 000000000..7f7c91784
--- /dev/null
+++ b/ports/stm/boards/STM32F405_fs.ld
@@ -0,0 +1,108 @@
+/*
+    GNU linker script for STM32F405 via Micropython
+*/
+
+/* Specify the memory areas */
+MEMORY
+{
+    FLASH (rx)      : ORIGIN = 0x08000000, LENGTH = 1024K /* entire flash */
+    FLASH_ISR (rx)  : ORIGIN = 0x08000000, LENGTH = 16K /* sector 0 */
+    FLASH_FS (rx)   : ORIGIN = 0x08004000, LENGTH = 48K /* sectors 1,2,3 are 16K */
+    FLASH_TEXT (rx) : ORIGIN = 0x08010000, LENGTH = 960K /* sector 4 is 64K, sectors 5,6,7 are 128K */
+    CCMRAM (xrw)    : ORIGIN = 0x10000000, LENGTH = 64K
+    RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 128K
+}
+
+/* produce a link error if there is not this amount of RAM for these sections */
+_minimum_stack_size = 2K;
+_minimum_heap_size = 16K;
+
+/* Define tho top end of the stack.  The stack is full descending so begins just
+   above last byte of RAM.  Note that EABI requires the stack to be 8-byte
+   aligned for a call. */
+_estack = ORIGIN(RAM) + LENGTH(RAM);
+
+/* RAM extents for the garbage collector */
+_ram_start = ORIGIN(RAM);
+_ram_end = ORIGIN(RAM) + LENGTH(RAM);
+
+ENTRY(Reset_Handler)
+
+/* define output sections */
+SECTIONS
+{
+    /* The startup code goes first into FLASH */
+    .isr_vector :
+    {
+        . = ALIGN(4);
+        KEEP(*(.isr_vector)) /* Startup code */
+
+        /* This first flash block is 16K annd the isr vectors only take up
+           about 400 bytes. Micropython pads this with files, but this didn't
+           work with the size of Circuitpython's ff object. */
+
+        . = ALIGN(4);
+    } >FLASH_ISR
+
+    /* The program code and other data goes into FLASH */
+    .text :
+    {
+        . = ALIGN(4);
+        *(.text*)          /* .text* sections (code) */
+        *(.rodata*)        /* .rodata* sections (constants, strings, etc.) */
+    /*  *(.glue_7)   */    /* glue arm to thumb code */
+    /*  *(.glue_7t)  */    /* glue thumb to arm code */
+
+        . = ALIGN(4);
+        _etext = .;        /* define a global symbol at end of code */
+    } >FLASH_TEXT
+
+    /* used by the startup to initialize data */
+    _sidata = LOADADDR(.data);
+
+    /* This is the initialized data section
+    The program executes knowing that the data is in the RAM
+    but the loader puts the initial values in the FLASH (inidata).
+    It is one task of the startup to copy the initial values from FLASH to RAM. */
+    .data :
+    {
+        . = ALIGN(4);
+        _sdata = .;        /* create a global symbol at data start; used by startup code in order to initialise the .data section in RAM */
+        *(.data*)          /* .data* sections */
+
+        . = ALIGN(4);
+        _edata = .;        /* define a global symbol at data end; used by startup code in order to initialise the .data section in RAM */
+    } >RAM AT> FLASH_TEXT
+
+    /* Uninitialized data section */
+    .bss :
+    {
+        . = ALIGN(4);
+        _sbss = .;         /* define a global symbol at bss start; used by startup code */
+        *(.bss*)
+        *(COMMON)
+
+        . = ALIGN(4);
+        _ebss = .;         /* define a global symbol at bss end; used by startup code and GC */
+    } >RAM
+
+    /* this is to define the start of the heap, and make sure we have a minimum size */
+    .heap :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_heap_size;
+        . = ALIGN(4);
+    } >RAM
+
+    /* this just checks there is enough RAM for the stack */
+    .stack :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_stack_size;
+        . = ALIGN(4);
+    } >RAM
+
+    .ARM.attributes 0 : { *(.ARM.attributes) }
+}
+
+
diff --git a/ports/stm/boards/STM32F407_fs.ld b/ports/stm/boards/STM32F407_fs.ld
new file mode 100644
index 000000000..7f7c91784
--- /dev/null
+++ b/ports/stm/boards/STM32F407_fs.ld
@@ -0,0 +1,108 @@
+/*
+    GNU linker script for STM32F405 via Micropython
+*/
+
+/* Specify the memory areas */
+MEMORY
+{
+    FLASH (rx)      : ORIGIN = 0x08000000, LENGTH = 1024K /* entire flash */
+    FLASH_ISR (rx)  : ORIGIN = 0x08000000, LENGTH = 16K /* sector 0 */
+    FLASH_FS (rx)   : ORIGIN = 0x08004000, LENGTH = 48K /* sectors 1,2,3 are 16K */
+    FLASH_TEXT (rx) : ORIGIN = 0x08010000, LENGTH = 960K /* sector 4 is 64K, sectors 5,6,7 are 128K */
+    CCMRAM (xrw)    : ORIGIN = 0x10000000, LENGTH = 64K
+    RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 128K
+}
+
+/* produce a link error if there is not this amount of RAM for these sections */
+_minimum_stack_size = 2K;
+_minimum_heap_size = 16K;
+
+/* Define tho top end of the stack.  The stack is full descending so begins just
+   above last byte of RAM.  Note that EABI requires the stack to be 8-byte
+   aligned for a call. */
+_estack = ORIGIN(RAM) + LENGTH(RAM);
+
+/* RAM extents for the garbage collector */
+_ram_start = ORIGIN(RAM);
+_ram_end = ORIGIN(RAM) + LENGTH(RAM);
+
+ENTRY(Reset_Handler)
+
+/* define output sections */
+SECTIONS
+{
+    /* The startup code goes first into FLASH */
+    .isr_vector :
+    {
+        . = ALIGN(4);
+        KEEP(*(.isr_vector)) /* Startup code */
+
+        /* This first flash block is 16K annd the isr vectors only take up
+           about 400 bytes. Micropython pads this with files, but this didn't
+           work with the size of Circuitpython's ff object. */
+
+        . = ALIGN(4);
+    } >FLASH_ISR
+
+    /* The program code and other data goes into FLASH */
+    .text :
+    {
+        . = ALIGN(4);
+        *(.text*)          /* .text* sections (code) */
+        *(.rodata*)        /* .rodata* sections (constants, strings, etc.) */
+    /*  *(.glue_7)   */    /* glue arm to thumb code */
+    /*  *(.glue_7t)  */    /* glue thumb to arm code */
+
+        . = ALIGN(4);
+        _etext = .;        /* define a global symbol at end of code */
+    } >FLASH_TEXT
+
+    /* used by the startup to initialize data */
+    _sidata = LOADADDR(.data);
+
+    /* This is the initialized data section
+    The program executes knowing that the data is in the RAM
+    but the loader puts the initial values in the FLASH (inidata).
+    It is one task of the startup to copy the initial values from FLASH to RAM. */
+    .data :
+    {
+        . = ALIGN(4);
+        _sdata = .;        /* create a global symbol at data start; used by startup code in order to initialise the .data section in RAM */
+        *(.data*)          /* .data* sections */
+
+        . = ALIGN(4);
+        _edata = .;        /* define a global symbol at data end; used by startup code in order to initialise the .data section in RAM */
+    } >RAM AT> FLASH_TEXT
+
+    /* Uninitialized data section */
+    .bss :
+    {
+        . = ALIGN(4);
+        _sbss = .;         /* define a global symbol at bss start; used by startup code */
+        *(.bss*)
+        *(COMMON)
+
+        . = ALIGN(4);
+        _ebss = .;         /* define a global symbol at bss end; used by startup code and GC */
+    } >RAM
+
+    /* this is to define the start of the heap, and make sure we have a minimum size */
+    .heap :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_heap_size;
+        . = ALIGN(4);
+    } >RAM
+
+    /* this just checks there is enough RAM for the stack */
+    .stack :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_stack_size;
+        . = ALIGN(4);
+    } >RAM
+
+    .ARM.attributes 0 : { *(.ARM.attributes) }
+}
+
+
diff --git a/ports/stm/boards/STM32F411VETx_FLASH.ld b/ports/stm/boards/STM32F411VETx_FLASH.ld
new file mode 100644
index 000000000..ac1ba3240
--- /dev/null
+++ b/ports/stm/boards/STM32F411VETx_FLASH.ld
@@ -0,0 +1,109 @@
+/*
+    GNU linker script for STM32F411 via Micropython
+*/
+
+/* Specify the memory areas */
+MEMORY
+{
+    FLASH (rx)      : ORIGIN = 0x08000000, LENGTH = 512K /* entire flash */
+    FLASH_ISR (rx)  : ORIGIN = 0x08000000, LENGTH = 16K /* sector 0 */
+    FLASH_FS (rx)   : ORIGIN = 0x08004000, LENGTH = 48K /* sectors 1,2,3 are 16K */
+    FLASH_TEXT (rx) : ORIGIN = 0x08010000, LENGTH = 448K /* sector 4 is 64K, sectors 5,6,7 are 128K */
+    RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 128K
+}
+
+/* produce a link error if there is not this amount of RAM for these sections */
+_minimum_stack_size = 2K;
+_minimum_heap_size = 16K;
+
+/* Define tho top end of the stack.  The stack is full descending so begins just
+   above last byte of RAM.  Note that EABI requires the stack to be 8-byte
+   aligned for a call. */
+_estack = ORIGIN(RAM) + LENGTH(RAM);
+
+/* RAM extents for the garbage collector */
+_ram_start = ORIGIN(RAM);
+_ram_end = ORIGIN(RAM) + LENGTH(RAM);
+_heap_start = _ebss; /* heap starts just after statically allocated memory */
+_heap_end = 0x2001c000; /* tunable */
+
+ENTRY(Reset_Handler)
+
+/* define output sections */
+SECTIONS
+{
+    /* The startup code goes first into FLASH */
+    .isr_vector :
+    {
+        . = ALIGN(4);
+        KEEP(*(.isr_vector)) /* Startup code */
+
+        /* This first flash block is 16K annd the isr vectors only take up
+           about 400 bytes. Micropython pads this with files, but this didn't
+           work with the size of Circuitpython's ff object. */
+
+        . = ALIGN(4);
+    } >FLASH_ISR
+
+    /* The program code and other data goes into FLASH */
+    .text :
+    {
+        . = ALIGN(4);
+        *(.text*)          /* .text* sections (code) */
+        *(.rodata*)        /* .rodata* sections (constants, strings, etc.) */
+    /*  *(.glue_7)   */    /* glue arm to thumb code */
+    /*  *(.glue_7t)  */    /* glue thumb to arm code */
+
+        . = ALIGN(4);
+        _etext = .;        /* define a global symbol at end of code */
+    } >FLASH_TEXT
+
+    /* used by the startup to initialize data */
+    _sidata = LOADADDR(.data);
+
+    /* This is the initialized data section
+    The program executes knowing that the data is in the RAM
+    but the loader puts the initial values in the FLASH (inidata).
+    It is one task of the startup to copy the initial values from FLASH to RAM. */
+    .data :
+    {
+        . = ALIGN(4);
+        _sdata = .;        /* create a global symbol at data start; used by startup code in order to initialise the .data section in RAM */
+        *(.data*)          /* .data* sections */
+
+        . = ALIGN(4);
+        _edata = .;        /* define a global symbol at data end; used by startup code in order to initialise the .data section in RAM */
+    } >RAM AT> FLASH_TEXT
+
+    /* Uninitialized data section */
+    .bss :
+    {
+        . = ALIGN(4);
+        _sbss = .;         /* define a global symbol at bss start; used by startup code */
+        *(.bss*)
+        *(COMMON)
+
+        . = ALIGN(4);
+        _ebss = .;         /* define a global symbol at bss end; used by startup code and GC */
+    } >RAM
+
+    /* this is to define the start of the heap, and make sure we have a minimum size */
+    .heap :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_heap_size;
+        . = ALIGN(4);
+    } >RAM
+
+    /* this just checks there is enough RAM for the stack */
+    .stack :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_stack_size;
+        . = ALIGN(4);
+    } >RAM
+
+    .ARM.attributes 0 : { *(.ARM.attributes) }
+}
+
+
diff --git a/ports/stm/boards/STM32F412ZGTx_FLASH.ld b/ports/stm/boards/STM32F412ZGTx_FLASH.ld
new file mode 100644
index 000000000..e0586709e
--- /dev/null
+++ b/ports/stm/boards/STM32F412ZGTx_FLASH.ld
@@ -0,0 +1,105 @@
+/*
+    GNU linker script for STM32F412
+*/
+
+/* Specify the memory areas */
+MEMORY
+{
+    FLASH (rx)      : ORIGIN = 0x08000000, LENGTH = 1024K /* entire flash */
+    FLASH_ISR (rx)  : ORIGIN = 0x08000000, LENGTH = 16K /* sector 0 */
+    FLASH_FS (rx)   : ORIGIN = 0x08004000, LENGTH = 48K /* sectors 1,2,3 are 16K */
+    FLASH_TEXT (rx) : ORIGIN = 0x08010000, LENGTH = 960K /* sector 4 is 64K, sectors 5,6,7 are 128K */
+    RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 256K
+}
+
+/* produce a link error if there is not this amount of RAM for these sections */
+_minimum_stack_size = 2K;
+_minimum_heap_size = 16K;
+
+/* Define tho top end of the stack.  The stack is full descending so begins just
+   above last byte of RAM.  Note that EABI requires the stack to be 8-byte
+   aligned for a call. */
+_estack = ORIGIN(RAM) + LENGTH(RAM);
+
+/* RAM extents for the garbage collector */
+_ram_start = ORIGIN(RAM);
+_ram_end = ORIGIN(RAM) + LENGTH(RAM);
+_heap_start = _ebss; /* heap starts just after statically allocated memory */
+_heap_end = 0x20020000; /* tunable */
+
+ENTRY(Reset_Handler)
+
+/* define output sections */
+SECTIONS
+{
+    /* The startup code goes first into FLASH */
+    .isr_vector :
+    {
+        . = ALIGN(4);
+        KEEP(*(.isr_vector)) /* Startup code */
+
+        /* This first flash block is 16K annd the isr vectors only take up
+           about 400 bytes. Micropython pads this with files, but this didn't
+           work with the size of Circuitpython's ff object. */
+
+        . = ALIGN(4);
+    } >FLASH_ISR
+
+    /* The program code and other data goes into FLASH */
+    .text :
+    {
+        . = ALIGN(4);
+        *(.text*)          /* .text* sections (code) */
+        *(.rodata*)        /* .rodata* sections (constants, strings, etc.) */
+
+        . = ALIGN(4);
+        _etext = .;        /* define a global symbol at end of code */
+    } >FLASH_TEXT
+
+    /* used by the startup to initialize data */
+    _sidata = LOADADDR(.data);
+
+    /* This is the initialized data section
+    The program executes knowing that the data is in the RAM
+    but the loader puts the initial values in the FLASH (inidata).
+    It is one task of the startup to copy the initial values from FLASH to RAM. */
+    .data :
+    {
+        . = ALIGN(4);
+        _sdata = .;        /* create a global symbol at data start; used by startup code in order to initialise the .data section in RAM */
+        *(.data*)          /* .data* sections */
+
+        . = ALIGN(4);
+        _edata = .;        /* define a global symbol at data end; used by startup code in order to initialise the .data section in RAM */
+    } >RAM AT> FLASH_TEXT
+
+    /* Uninitialized data section */
+    .bss :
+    {
+        . = ALIGN(4);
+        _sbss = .;         /* define a global symbol at bss start; used by startup code */
+        *(.bss*)
+        *(COMMON)
+
+        . = ALIGN(4);
+        _ebss = .;         /* define a global symbol at bss end; used by startup code and GC */
+    } >RAM
+
+    /* this is to define the start of the heap, and make sure we have a minimum size */
+    .heap :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_heap_size;
+        . = ALIGN(4);
+    } >RAM
+
+    /* this just checks there is enough RAM for the stack */
+    .stack :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_stack_size;
+        . = ALIGN(4);
+    } >RAM
+
+    .ARM.attributes 0 : { *(.ARM.attributes) }
+}
diff --git a/ports/stm/boards/board.h b/ports/stm/boards/board.h
new file mode 100644
index 000000000..22d9e99be
--- /dev/null
+++ b/ports/stm/boards/board.h
@@ -0,0 +1,45 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+// This file defines board specific functions.
+
+#ifndef MICROPY_INCLUDED_STM32F4_BOARDS_BOARD_H
+#define MICROPY_INCLUDED_STM32F4_BOARDS_BOARD_H
+
+#include <stdbool.h>
+
+// Initializes board related state once on start up.
+void board_init(void);
+
+// Returns true if the user initiates safe mode in a board specific way.
+// Also add BOARD_USER_SAFE_MODE in mpconfigboard.h to explain the board specific
+// way.
+bool board_requests_safe_mode(void);
+
+// Reset the state of off MCU components such as neopixels.
+void reset_board(void);
+
+#endif  // MICROPY_INCLUDED_STM32F4_BOARDS_BOARD_H
diff --git a/ports/stm/boards/espruino_pico/README.md b/ports/stm/boards/espruino_pico/README.md
new file mode 100644
index 000000000..9f0321c47
--- /dev/null
+++ b/ports/stm/boards/espruino_pico/README.md
@@ -0,0 +1,15 @@
+# Flashing the Espruino Pico
+
+The Espruino Pico is normally updated via a bootloader activated by the Espruino web app. This approach is not practical for Circuitpython as it takes too much space from the internal filesystem - thus, you will need to follow the instructions for advanced reflashing using the built-in ROM bootloader on all STM32F4 MCUs (instructions sourced from https://www.espruino.com/Pico#advanced-reflashing)
+
+ - Short out the BOOT0/BTN solder jumper on the back of the board - you can do this by drawing over it with a pencil.
+ - Install ST's DFU utility on Windows, or dfu-util for Mac or Linux
+ 	- **Mac**: install with Homebrew: `brew install dfu-util`
+ 	- **Linux**: install with apt-get: `sudo apt-get install dfu-util`
+ 	- **Windows**: download [ST's application](https://www.st.com/en/development-tools/stsw-stm32080.html) or install the Linux subsystem for Windows 10 and follow the linux instructions. 
+ - Hold down the Pico's button while plugging it into USB (when overwriting Espruino's default firmware)
+ - Navigate to the same directory as your firmware.bin file for Circuitpython and run the following command: `sudo dfu-util -a 0 -s 0x08000000 -D firmware.bin` or use the ST utility on Windows. 
+ - Restart the board. 
+
+
+To reinstall Espruino, follow the same steps with the latest Espruino Pico binary from espruino.com/binaries. This will reinstall the usual Espruino bootloader. You must un-short the BOOT0/BTN jumper to re-use the original Espruino Bootloader again. If you used a Pencil mark then you may need to use cleaning fluid and a small brush to totally clear out the graphite.
\ No newline at end of file
diff --git a/ports/stm/boards/espruino_pico/board.c b/ports/stm/boards/espruino_pico/board.c
new file mode 100644
index 000000000..82b0c506e
--- /dev/null
+++ b/ports/stm/boards/espruino_pico/board.c
@@ -0,0 +1,39 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "boards/board.h"
+#include "mpconfigboard.h"
+
+void board_init(void) {
+}
+
+bool board_requests_safe_mode(void) {
+    return false;
+}
+
+void reset_board(void) {
+
+}
diff --git a/ports/stm/boards/espruino_pico/mpconfigboard.h b/ports/stm/boards/espruino_pico/mpconfigboard.h
new file mode 100644
index 000000000..d4430380c
--- /dev/null
+++ b/ports/stm/boards/espruino_pico/mpconfigboard.h
@@ -0,0 +1,39 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+//Micropython setup
+
+#define MICROPY_HW_BOARD_NAME       "Espruino Pico"
+#define MICROPY_HW_MCU_NAME         "STM32F401xD"
+
+#define FLASH_SIZE                  (0x60000)
+#define FLASH_PAGE_SIZE             (0x4000)
+
+#define AUTORESET_DELAY_MS (500)
+#define BOARD_FLASH_SIZE (FLASH_SIZE - 0x4000)
+
+#define BOARD_OSC_DIV (8)
+
diff --git a/ports/stm/boards/espruino_pico/mpconfigboard.mk b/ports/stm/boards/espruino_pico/mpconfigboard.mk
new file mode 100644
index 000000000..151ca1437
--- /dev/null
+++ b/ports/stm/boards/espruino_pico/mpconfigboard.mk
@@ -0,0 +1,16 @@
+USB_VID = 0x239A
+USB_PID = 0x808E
+USB_PRODUCT = "Espruino Pico"
+USB_MANUFACTURER = "Espruino"
+USB_DEVICES = "CDC,MSC"
+
+INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL = NONE
+
+MCU_SERIES = m4
+MCU_VARIANT = stm32f4
+MCU_SUB_VARIANT = stm32f401xe
+MCU_PACKAGE = 48
+CMSIS_MCU = STM32F401xE
+LD_FILE = boards/STM32F401xd_fs.ld # use for internal flash
+
diff --git a/ports/stm/boards/espruino_pico/pins.c b/ports/stm/boards/espruino_pico/pins.c
new file mode 100644
index 000000000..55c0336c5
--- /dev/null
+++ b/ports/stm/boards/espruino_pico/pins.c
@@ -0,0 +1,33 @@
+#include "shared-bindings/board/__init__.h"
+
+STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_B15), MP_ROM_PTR(&pin_PB15) },
+    { MP_ROM_QSTR(MP_QSTR_B14), MP_ROM_PTR(&pin_PB14) },
+    { MP_ROM_QSTR(MP_QSTR_B13), MP_ROM_PTR(&pin_PB13) },
+    { MP_ROM_QSTR(MP_QSTR_B10), MP_ROM_PTR(&pin_PB10) },
+    { MP_ROM_QSTR(MP_QSTR_B1), MP_ROM_PTR(&pin_PB01) },
+    { MP_ROM_QSTR(MP_QSTR_A7), MP_ROM_PTR(&pin_PA07) },
+    { MP_ROM_QSTR(MP_QSTR_A6), MP_ROM_PTR(&pin_PA06) },
+    { MP_ROM_QSTR(MP_QSTR_A5), MP_ROM_PTR(&pin_PA05) },
+
+    { MP_ROM_QSTR(MP_QSTR_B3), MP_ROM_PTR(&pin_PB03) },
+    { MP_ROM_QSTR(MP_QSTR_B4), MP_ROM_PTR(&pin_PB04) },
+    { MP_ROM_QSTR(MP_QSTR_B5), MP_ROM_PTR(&pin_PB05) },
+    { MP_ROM_QSTR(MP_QSTR_B6), MP_ROM_PTR(&pin_PB06) },
+    { MP_ROM_QSTR(MP_QSTR_B7), MP_ROM_PTR(&pin_PB07) },
+    { MP_ROM_QSTR(MP_QSTR_A8), MP_ROM_PTR(&pin_PA08) },
+
+    { MP_ROM_QSTR(MP_QSTR_A4), MP_ROM_PTR(&pin_PA04) },
+    { MP_ROM_QSTR(MP_QSTR_A3), MP_ROM_PTR(&pin_PA03) },
+    { MP_ROM_QSTR(MP_QSTR_A2), MP_ROM_PTR(&pin_PA02) },
+    { MP_ROM_QSTR(MP_QSTR_A1), MP_ROM_PTR(&pin_PA01) },
+    { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA00) },
+    { MP_ROM_QSTR(MP_QSTR_A10), MP_ROM_PTR(&pin_PA10) },
+    { MP_ROM_QSTR(MP_QSTR_B9), MP_ROM_PTR(&pin_PB09) },
+    { MP_ROM_QSTR(MP_QSTR_B8), MP_ROM_PTR(&pin_PB08) },
+
+    { MP_ROM_QSTR(MP_QSTR_BTN), MP_ROM_PTR(&pin_PC13) },
+    { MP_ROM_QSTR(MP_QSTR_LED1), MP_ROM_PTR(&pin_PB02) },
+    { MP_ROM_QSTR(MP_QSTR_LED2), MP_ROM_PTR(&pin_PB12) },
+};
+MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/stm/boards/espruino_pico/stm32f4xx_hal_conf.h b/ports/stm/boards/espruino_pico/stm32f4xx_hal_conf.h
new file mode 100644
index 000000000..ab04df318
--- /dev/null
+++ b/ports/stm/boards/espruino_pico/stm32f4xx_hal_conf.h
@@ -0,0 +1,440 @@
+/**
+  ******************************************************************************
+  * @file    stm32f4xx_hal_conf_template.h
+  * @author  MCD Application Team
+  * @brief   HAL configuration template file. 
+  *          This file should be copied to the application folder and renamed
+  *          to stm32f4xx_hal_conf.h.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */ 
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __STM32F4xx_HAL_CONF_H
+#define __STM32F4xx_HAL_CONF_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+
+/* ########################## Module Selection ############################## */
+/**
+  * @brief This is the list of modules to be used in the HAL driver 
+  */
+#define HAL_MODULE_ENABLED  
+
+#define HAL_ADC_MODULE_ENABLED
+/* #define HAL_CRYP_MODULE_ENABLED   */
+/* #define HAL_CAN_MODULE_ENABLED   */
+/* #define HAL_CRC_MODULE_ENABLED   */
+/* #define HAL_CRYP_MODULE_ENABLED   */
+#define HAL_DAC_MODULE_ENABLED
+/* #define HAL_DCMI_MODULE_ENABLED   */
+/* #define HAL_DMA2D_MODULE_ENABLED   */
+/* #define HAL_ETH_MODULE_ENABLED   */
+/* #define HAL_NAND_MODULE_ENABLED   */
+/* #define HAL_NOR_MODULE_ENABLED   */
+/* #define HAL_PCCARD_MODULE_ENABLED   */
+/* #define HAL_SRAM_MODULE_ENABLED   */
+/* #define HAL_SDRAM_MODULE_ENABLED   */
+/* #define HAL_HASH_MODULE_ENABLED   */
+#define HAL_I2C_MODULE_ENABLED
+#define HAL_I2S_MODULE_ENABLED
+/* #define HAL_IWDG_MODULE_ENABLED   */
+/* #define HAL_LTDC_MODULE_ENABLED   */
+/* #define HAL_RNG_MODULE_ENABLED   */
+/* #define HAL_RTC_MODULE_ENABLED   */
+/* #define HAL_SAI_MODULE_ENABLED   */
+/* #define HAL_SD_MODULE_ENABLED   */
+/* #define HAL_MMC_MODULE_ENABLED   */
+#define HAL_SPI_MODULE_ENABLED
+#define HAL_TIM_MODULE_ENABLED
+#define HAL_UART_MODULE_ENABLED   
+#define HAL_USART_MODULE_ENABLED
+/* #define HAL_IRDA_MODULE_ENABLED   */
+/* #define HAL_SMARTCARD_MODULE_ENABLED   */
+/* #define HAL_WWDG_MODULE_ENABLED   */
+#define HAL_PCD_MODULE_ENABLED
+/* #define HAL_HCD_MODULE_ENABLED   */
+/* #define HAL_DSI_MODULE_ENABLED   */
+/* #define HAL_QSPI_MODULE_ENABLED   */
+/* #define HAL_QSPI_MODULE_ENABLED   */
+/* #define HAL_CEC_MODULE_ENABLED   */
+/* #define HAL_FMPI2C_MODULE_ENABLED   */
+/* #define HAL_SPDIFRX_MODULE_ENABLED   */
+/* #define HAL_DFSDM_MODULE_ENABLED   */
+/* #define HAL_LPTIM_MODULE_ENABLED   */
+/* #define HAL_EXTI_MODULE_ENABLED   */
+#define HAL_GPIO_MODULE_ENABLED
+#define HAL_EXTI_MODULE_ENABLED
+#define HAL_DMA_MODULE_ENABLED
+#define HAL_RCC_MODULE_ENABLED
+#define HAL_FLASH_MODULE_ENABLED
+#define HAL_PWR_MODULE_ENABLED
+#define HAL_CORTEX_MODULE_ENABLED
+
+/* ########################## HSE/HSI Values adaptation ##################### */
+/**
+  * @brief Adjust the value of External High Speed oscillator (HSE) used in your application.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSE is used as system clock source, directly or through the PLL).  
+  */
+#if !defined  (HSE_VALUE) 
+  #define HSE_VALUE    ((uint32_t)8000000) /*!< Value of the External oscillator in Hz */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSE_STARTUP_TIMEOUT)
+  #define HSE_STARTUP_TIMEOUT    ((uint32_t)100U)   /*!< Time out for HSE start up, in ms */
+#endif /* HSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief Internal High Speed oscillator (HSI) value.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSI is used as system clock source, directly or through the PLL). 
+  */
+#if !defined  (HSI_VALUE)
+  #define HSI_VALUE    ((uint32_t)16000000) /*!< Value of the Internal oscillator in Hz*/
+#endif /* HSI_VALUE */
+
+/**
+  * @brief Internal Low Speed oscillator (LSI) value.
+  */
+#if !defined  (LSI_VALUE) 
+ #define LSI_VALUE  ((uint32_t)40000)    
+#endif /* LSI_VALUE */                      /*!< Value of the Internal Low Speed oscillator in Hz
+                                             The real value may vary depending on the variations
+                                             in voltage and temperature.  */
+/**
+  * @brief External Low Speed oscillator (LSE) value.
+  */
+#if !defined  (LSE_VALUE)
+ #define LSE_VALUE  ((uint32_t)32768)    /*!< Value of the External Low Speed oscillator in Hz */
+#endif /* LSE_VALUE */
+
+#if !defined  (LSE_STARTUP_TIMEOUT)
+  #define LSE_STARTUP_TIMEOUT    ((uint32_t)5000U)   /*!< Time out for LSE start up, in ms */
+#endif /* LSE_STARTUP_TIMEOUT */
+
+
+/**
+  * @brief External clock source for I2S peripheral
+  *        This value is used by the I2S HAL module to compute the I2S clock source 
+  *        frequency, this source is inserted directly through I2S_CKIN pad. 
+  */
+#if !defined  (EXTERNAL_CLOCK_VALUE)
+  #define EXTERNAL_CLOCK_VALUE    ((uint32_t)12288000U) /*!< Value of the External audio frequency in Hz*/
+#endif /* EXTERNAL_CLOCK_VALUE */
+
+/* Tip: To avoid modifying this file each time you need to use different HSE,
+   ===  you can define the HSE value in your toolchain compiler preprocessor. */
+
+/* ########################### System Configuration ######################### */
+/**
+  * @brief This is the HAL system configuration section
+  */
+#define  VDD_VALUE          ((uint32_t)3300U) /*!< Value of VDD in mv */           
+#define  TICK_INT_PRIORITY            ((uint32_t)0U)   /*!< tick interrupt priority */            
+#define  USE_RTOS                     0U     
+#define  PREFETCH_ENABLE              1U
+#define  INSTRUCTION_CACHE_ENABLE     1U
+#define  DATA_CACHE_ENABLE            1U
+
+/* ########################## Assert Selection ############################## */
+/**
+  * @brief Uncomment the line below to expanse the "assert_param" macro in the 
+  *        HAL drivers code
+  */
+/* #define USE_FULL_ASSERT    1U */
+
+/* ################## Ethernet peripheral configuration ##################### */
+
+/* Section 1 : Ethernet peripheral configuration */
+
+/* MAC ADDRESS: MAC_ADDR0:MAC_ADDR1:MAC_ADDR2:MAC_ADDR3:MAC_ADDR4:MAC_ADDR5 */
+#define MAC_ADDR0   2U
+#define MAC_ADDR1   0U
+#define MAC_ADDR2   0U
+#define MAC_ADDR3   0U
+#define MAC_ADDR4   0U
+#define MAC_ADDR5   0U
+
+/* Definition of the Ethernet driver buffers size and count */   
+#define ETH_RX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for receive               */
+#define ETH_TX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for transmit              */
+#define ETH_RXBUFNB                    ((uint32_t)4U)       /* 4 Rx buffers of size ETH_RX_BUF_SIZE  */
+#define ETH_TXBUFNB                    ((uint32_t)4U)       /* 4 Tx buffers of size ETH_TX_BUF_SIZE  */
+
+/* Section 2: PHY configuration section */
+
+/* DP83848_PHY_ADDRESS Address*/ 
+#define DP83848_PHY_ADDRESS           0x01U
+/* PHY Reset delay these values are based on a 1 ms Systick interrupt*/ 
+#define PHY_RESET_DELAY                 ((uint32_t)0x000000FFU)
+/* PHY Configuration delay */
+#define PHY_CONFIG_DELAY                ((uint32_t)0x00000FFFU)
+
+#define PHY_READ_TO                     ((uint32_t)0x0000FFFFU)
+#define PHY_WRITE_TO                    ((uint32_t)0x0000FFFFU)
+
+/* Section 3: Common PHY Registers */
+
+#define PHY_BCR                         ((uint16_t)0x0000U)    /*!< Transceiver Basic Control Register   */
+#define PHY_BSR                         ((uint16_t)0x0001U)    /*!< Transceiver Basic Status Register    */
+ 
+#define PHY_RESET                       ((uint16_t)0x8000U)  /*!< PHY Reset */
+#define PHY_LOOPBACK                    ((uint16_t)0x4000U)  /*!< Select loop-back mode */
+#define PHY_FULLDUPLEX_100M             ((uint16_t)0x2100U)  /*!< Set the full-duplex mode at 100 Mb/s */
+#define PHY_HALFDUPLEX_100M             ((uint16_t)0x2000U)  /*!< Set the half-duplex mode at 100 Mb/s */
+#define PHY_FULLDUPLEX_10M              ((uint16_t)0x0100U)  /*!< Set the full-duplex mode at 10 Mb/s  */
+#define PHY_HALFDUPLEX_10M              ((uint16_t)0x0000U)  /*!< Set the half-duplex mode at 10 Mb/s  */
+#define PHY_AUTONEGOTIATION             ((uint16_t)0x1000U)  /*!< Enable auto-negotiation function     */
+#define PHY_RESTART_AUTONEGOTIATION     ((uint16_t)0x0200U)  /*!< Restart auto-negotiation function    */
+#define PHY_POWERDOWN                   ((uint16_t)0x0800U)  /*!< Select the power down mode           */
+#define PHY_ISOLATE                     ((uint16_t)0x0400U)  /*!< Isolate PHY from MII                 */
+
+#define PHY_AUTONEGO_COMPLETE           ((uint16_t)0x0020U)  /*!< Auto-Negotiation process completed   */
+#define PHY_LINKED_STATUS               ((uint16_t)0x0004U)  /*!< Valid link established               */
+#define PHY_JABBER_DETECTION            ((uint16_t)0x0002U)  /*!< Jabber condition detected            */
+  
+/* Section 4: Extended PHY Registers */
+#define PHY_SR                          ((uint16_t)0x10U)    /*!< PHY status register Offset                      */
+
+#define PHY_SPEED_STATUS                ((uint16_t)0x0002U)  /*!< PHY Speed mask                                  */
+#define PHY_DUPLEX_STATUS               ((uint16_t)0x0004U)  /*!< PHY Duplex mask                                 */
+
+/* ################## SPI peripheral configuration ########################## */
+
+/* CRC FEATURE: Use to activate CRC feature inside HAL SPI Driver
+* Activated: CRC code is present inside driver
+* Deactivated: CRC code cleaned from driver
+*/
+
+#define USE_SPI_CRC                     0U
+
+/* Includes ------------------------------------------------------------------*/
+/**
+  * @brief Include module's header file 
+  */
+
+#ifdef HAL_RCC_MODULE_ENABLED
+  #include "stm32f4xx_hal_rcc.h"
+#endif /* HAL_RCC_MODULE_ENABLED */
+
+#ifdef HAL_EXTI_MODULE_ENABLED
+  #include "stm32f4xx_hal_exti.h"
+#endif /* HAL_EXTI_MODULE_ENABLED */
+
+#ifdef HAL_GPIO_MODULE_ENABLED
+  #include "stm32f4xx_hal_gpio.h"
+#endif /* HAL_GPIO_MODULE_ENABLED */
+
+#ifdef HAL_DMA_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma.h"
+#endif /* HAL_DMA_MODULE_ENABLED */
+   
+#ifdef HAL_CORTEX_MODULE_ENABLED
+  #include "stm32f4xx_hal_cortex.h"
+#endif /* HAL_CORTEX_MODULE_ENABLED */
+
+#ifdef HAL_ADC_MODULE_ENABLED
+  #include "stm32f4xx_hal_adc.h"
+#endif /* HAL_ADC_MODULE_ENABLED */
+
+#ifdef HAL_CAN_MODULE_ENABLED
+  #include "stm32f4xx_hal_can.h"
+#endif /* HAL_CAN_MODULE_ENABLED */
+
+#ifdef HAL_CRC_MODULE_ENABLED
+  #include "stm32f4xx_hal_crc.h"
+#endif /* HAL_CRC_MODULE_ENABLED */
+
+#ifdef HAL_CRYP_MODULE_ENABLED
+  #include "stm32f4xx_hal_cryp.h" 
+#endif /* HAL_CRYP_MODULE_ENABLED */
+
+#ifdef HAL_DMA2D_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma2d.h"
+#endif /* HAL_DMA2D_MODULE_ENABLED */
+
+#ifdef HAL_DAC_MODULE_ENABLED
+  #include "stm32f4xx_hal_dac.h"
+#endif /* HAL_DAC_MODULE_ENABLED */
+
+#ifdef HAL_DCMI_MODULE_ENABLED
+  #include "stm32f4xx_hal_dcmi.h"
+#endif /* HAL_DCMI_MODULE_ENABLED */
+
+#ifdef HAL_ETH_MODULE_ENABLED
+  #include "stm32f4xx_hal_eth.h"
+#endif /* HAL_ETH_MODULE_ENABLED */
+
+#ifdef HAL_FLASH_MODULE_ENABLED
+  #include "stm32f4xx_hal_flash.h"
+#endif /* HAL_FLASH_MODULE_ENABLED */
+ 
+#ifdef HAL_SRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sram.h"
+#endif /* HAL_SRAM_MODULE_ENABLED */
+
+#ifdef HAL_NOR_MODULE_ENABLED
+  #include "stm32f4xx_hal_nor.h"
+#endif /* HAL_NOR_MODULE_ENABLED */
+
+#ifdef HAL_NAND_MODULE_ENABLED
+  #include "stm32f4xx_hal_nand.h"
+#endif /* HAL_NAND_MODULE_ENABLED */
+
+#ifdef HAL_PCCARD_MODULE_ENABLED
+  #include "stm32f4xx_hal_pccard.h"
+#endif /* HAL_PCCARD_MODULE_ENABLED */ 
+  
+#ifdef HAL_SDRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sdram.h"
+#endif /* HAL_SDRAM_MODULE_ENABLED */      
+
+#ifdef HAL_HASH_MODULE_ENABLED
+ #include "stm32f4xx_hal_hash.h"
+#endif /* HAL_HASH_MODULE_ENABLED */
+
+#ifdef HAL_I2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2c.h"
+#endif /* HAL_I2C_MODULE_ENABLED */
+
+#ifdef HAL_I2S_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2s.h"
+#endif /* HAL_I2S_MODULE_ENABLED */
+
+#ifdef HAL_IWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_iwdg.h"
+#endif /* HAL_IWDG_MODULE_ENABLED */
+
+#ifdef HAL_LTDC_MODULE_ENABLED
+ #include "stm32f4xx_hal_ltdc.h"
+#endif /* HAL_LTDC_MODULE_ENABLED */
+
+#ifdef HAL_PWR_MODULE_ENABLED
+ #include "stm32f4xx_hal_pwr.h"
+#endif /* HAL_PWR_MODULE_ENABLED */
+
+#ifdef HAL_RNG_MODULE_ENABLED
+ #include "stm32f4xx_hal_rng.h"
+#endif /* HAL_RNG_MODULE_ENABLED */
+
+#ifdef HAL_RTC_MODULE_ENABLED
+ #include "stm32f4xx_hal_rtc.h"
+#endif /* HAL_RTC_MODULE_ENABLED */
+
+#ifdef HAL_SAI_MODULE_ENABLED
+ #include "stm32f4xx_hal_sai.h"
+#endif /* HAL_SAI_MODULE_ENABLED */
+
+#ifdef HAL_SD_MODULE_ENABLED
+ #include "stm32f4xx_hal_sd.h"
+#endif /* HAL_SD_MODULE_ENABLED */
+
+#ifdef HAL_MMC_MODULE_ENABLED
+ #include "stm32f4xx_hal_mmc.h"
+#endif /* HAL_MMC_MODULE_ENABLED */
+
+#ifdef HAL_SPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_spi.h"
+#endif /* HAL_SPI_MODULE_ENABLED */
+
+#ifdef HAL_TIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_tim.h"
+#endif /* HAL_TIM_MODULE_ENABLED */
+
+#ifdef HAL_UART_MODULE_ENABLED
+ #include "stm32f4xx_hal_uart.h"
+#endif /* HAL_UART_MODULE_ENABLED */
+
+#ifdef HAL_USART_MODULE_ENABLED
+ #include "stm32f4xx_hal_usart.h"
+#endif /* HAL_USART_MODULE_ENABLED */
+
+#ifdef HAL_IRDA_MODULE_ENABLED
+ #include "stm32f4xx_hal_irda.h"
+#endif /* HAL_IRDA_MODULE_ENABLED */
+
+#ifdef HAL_SMARTCARD_MODULE_ENABLED
+ #include "stm32f4xx_hal_smartcard.h"
+#endif /* HAL_SMARTCARD_MODULE_ENABLED */
+
+#ifdef HAL_WWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_wwdg.h"
+#endif /* HAL_WWDG_MODULE_ENABLED */
+
+#ifdef HAL_PCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_pcd.h"
+#endif /* HAL_PCD_MODULE_ENABLED */
+
+#ifdef HAL_HCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_hcd.h"
+#endif /* HAL_HCD_MODULE_ENABLED */
+   
+#ifdef HAL_DSI_MODULE_ENABLED
+ #include "stm32f4xx_hal_dsi.h"
+#endif /* HAL_DSI_MODULE_ENABLED */
+
+#ifdef HAL_QSPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_qspi.h"
+#endif /* HAL_QSPI_MODULE_ENABLED */
+
+#ifdef HAL_CEC_MODULE_ENABLED
+ #include "stm32f4xx_hal_cec.h"
+#endif /* HAL_CEC_MODULE_ENABLED */
+
+#ifdef HAL_FMPI2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_fmpi2c.h"
+#endif /* HAL_FMPI2C_MODULE_ENABLED */
+
+#ifdef HAL_SPDIFRX_MODULE_ENABLED
+ #include "stm32f4xx_hal_spdifrx.h"
+#endif /* HAL_SPDIFRX_MODULE_ENABLED */
+
+#ifdef HAL_DFSDM_MODULE_ENABLED
+ #include "stm32f4xx_hal_dfsdm.h"
+#endif /* HAL_DFSDM_MODULE_ENABLED */
+
+#ifdef HAL_LPTIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_lptim.h"
+#endif /* HAL_LPTIM_MODULE_ENABLED */
+   
+/* Exported macro ------------------------------------------------------------*/
+#ifdef  USE_FULL_ASSERT
+/**
+  * @brief  The assert_param macro is used for function's parameters check.
+  * @param  expr: If expr is false, it calls assert_failed function
+  *         which reports the name of the source file and the source
+  *         line number of the call that failed. 
+  *         If expr is true, it returns no value.
+  * @retval None
+  */
+  #define assert_param(expr) ((expr) ? (void)0U : assert_failed((uint8_t *)__FILE__, __LINE__))
+/* Exported functions ------------------------------------------------------- */
+  void assert_failed(uint8_t* file, uint32_t line);
+#else
+  #define assert_param(expr) ((void)0U)
+#endif /* USE_FULL_ASSERT */    
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __STM32F4xx_HAL_CONF_H */
+ 
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/ports/stm/boards/espruino_wifi/README.MD b/ports/stm/boards/espruino_wifi/README.MD
new file mode 100644
index 000000000..8c2cd3be2
--- /dev/null
+++ b/ports/stm/boards/espruino_wifi/README.MD
@@ -0,0 +1,15 @@
+# Flashing the Espruino Wifi
+
+The Espruino Wifi is normally updated via a bootloader activated by the Espruino web app. This approach is not practical for Circuitpython as it takes too much space from the internal filesystem - thus, you will need to follow the instructions for advanced reflashing using the built-in ROM bootloader on all STM32F4 MCUs (instructions sourced from https://www.espruino.com/Wifi#advanced-reflashing)
+
+ - Short out the BOOT0/BTN solder jumper on the back of the board - you can do this by drawing over it with a pencil.
+ - Install ST's DFU utility on Windows, or dfu-util for Mac or Linux
+ 	- **Mac**: install with Homebrew: `brew install dfu-util`
+ 	- **Linux**: install with apt-get: `sudo apt-get install dfu-util`
+ 	- **Windows**: download [ST's application](https://www.st.com/en/development-tools/stsw-stm32080.html) or install the Linux subsystem for Windows 10 and follow the linux instructions. 
+ - Hold down the Wifi's button while plugging it into USB (when overwriting Espruino's default firmware)
+ - Navigate to the same directory as your firmware.bin file for Circuitpython and run the following command: `sudo dfu-util -a 0 -s 0x08000000 -D firmware.bin` or use the ST utility on Windows. 
+ - Restart the board. 
+
+
+To reinstall Espruino, follow the same steps with the latest Espruino Wifi binary from espruino.com/binaries. This will reinstall the usual Espruino bootloader. You must un-short the BOOT0/BTN jumper to re-use the original Espruino Bootloader again. If you used a Pencil mark then you may need to use cleaning fluid and a small brush to totally clear out the graphite.
\ No newline at end of file
diff --git a/ports/stm/boards/espruino_wifi/board.c b/ports/stm/boards/espruino_wifi/board.c
new file mode 100644
index 000000000..4421970ee
--- /dev/null
+++ b/ports/stm/boards/espruino_wifi/board.c
@@ -0,0 +1,38 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "boards/board.h"
+
+void board_init(void) {
+}
+
+bool board_requests_safe_mode(void) {
+  return false;
+}
+
+void reset_board(void) {
+
+}
diff --git a/ports/stm/boards/espruino_wifi/mpconfigboard.h b/ports/stm/boards/espruino_wifi/mpconfigboard.h
new file mode 100644
index 000000000..abdc9e8fa
--- /dev/null
+++ b/ports/stm/boards/espruino_wifi/mpconfigboard.h
@@ -0,0 +1,36 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+//Micropython setup
+
+#define MICROPY_HW_BOARD_NAME       "Espruino Wifi"
+#define MICROPY_HW_MCU_NAME         "STM32F411xE"
+
+#define FLASH_SIZE                  (0x80000) //512K
+#define FLASH_PAGE_SIZE             (0x4000)  //16K
+
+#define BOARD_OSC_DIV (8)
+#define BOARD_OVERWRITE_SWD (1)
diff --git a/ports/stm/boards/espruino_wifi/mpconfigboard.mk b/ports/stm/boards/espruino_wifi/mpconfigboard.mk
new file mode 100644
index 000000000..8b28cf07c
--- /dev/null
+++ b/ports/stm/boards/espruino_wifi/mpconfigboard.mk
@@ -0,0 +1,16 @@
+USB_VID = 0x239A
+USB_PID = 0x8090
+USB_PRODUCT = "Espruino Wifi"
+USB_MANUFACTURER = "Espruino"
+USB_DEVICES = "CDC,MSC"
+
+INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL = NONE
+
+MCU_SERIES = m4
+MCU_VARIANT = stm32f4
+MCU_SUB_VARIANT = stm32f411xe
+MCU_PACKAGE = 48
+CMSIS_MCU = STM32F411xE
+LD_FILE = boards/STM32F411VETx_FLASH.ld
+
diff --git a/ports/stm/boards/espruino_wifi/pins.c b/ports/stm/boards/espruino_wifi/pins.c
new file mode 100644
index 000000000..8800317d5
--- /dev/null
+++ b/ports/stm/boards/espruino_wifi/pins.c
@@ -0,0 +1,39 @@
+#include "shared-bindings/board/__init__.h"
+
+STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
+  //P1
+  { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA00) },
+  { MP_ROM_QSTR(MP_QSTR_A1), MP_ROM_PTR(&pin_PA01) },
+  { MP_ROM_QSTR(MP_QSTR_A4), MP_ROM_PTR(&pin_PA04) },
+  { MP_ROM_QSTR(MP_QSTR_A5), MP_ROM_PTR(&pin_PA05) },
+  { MP_ROM_QSTR(MP_QSTR_A6), MP_ROM_PTR(&pin_PA06) },
+  { MP_ROM_QSTR(MP_QSTR_A7), MP_ROM_PTR(&pin_PA07) },
+  { MP_ROM_QSTR(MP_QSTR_B1), MP_ROM_PTR(&pin_PB01) },
+  { MP_ROM_QSTR(MP_QSTR_B10), MP_ROM_PTR(&pin_PB10) },
+  { MP_ROM_QSTR(MP_QSTR_B13), MP_ROM_PTR(&pin_PB13) },
+  { MP_ROM_QSTR(MP_QSTR_B14), MP_ROM_PTR(&pin_PB14) },
+  { MP_ROM_QSTR(MP_QSTR_B15), MP_ROM_PTR(&pin_PB15) },
+
+  { MP_ROM_QSTR(MP_QSTR_B0), MP_ROM_PTR(&pin_PB00) },
+  { MP_ROM_QSTR(MP_QSTR_B9), MP_ROM_PTR(&pin_PB09) },
+  { MP_ROM_QSTR(MP_QSTR_B8), MP_ROM_PTR(&pin_PB08) },
+  { MP_ROM_QSTR(MP_QSTR_B7), MP_ROM_PTR(&pin_PB07) },
+  { MP_ROM_QSTR(MP_QSTR_B6), MP_ROM_PTR(&pin_PB06) },
+  { MP_ROM_QSTR(MP_QSTR_B5), MP_ROM_PTR(&pin_PB05) },
+  { MP_ROM_QSTR(MP_QSTR_B4), MP_ROM_PTR(&pin_PB04) },
+  { MP_ROM_QSTR(MP_QSTR_B3), MP_ROM_PTR(&pin_PB03) },
+
+  { MP_ROM_QSTR(MP_QSTR_A10), MP_ROM_PTR(&pin_PA10) },
+  { MP_ROM_QSTR(MP_QSTR_A8), MP_ROM_PTR(&pin_PA08) },
+
+  { MP_ROM_QSTR(MP_QSTR_LED1), MP_ROM_PTR(&pin_PB02) },
+  { MP_ROM_QSTR(MP_QSTR_LED2), MP_ROM_PTR(&pin_PB12) },
+  { MP_ROM_QSTR(MP_QSTR_BTN), MP_ROM_PTR(&pin_PC13) },
+
+  { MP_ROM_QSTR(MP_QSTR_ESP_RX), MP_ROM_PTR(&pin_PA02) },
+  { MP_ROM_QSTR(MP_QSTR_ESP_TX), MP_ROM_PTR(&pin_PA03) },
+  { MP_ROM_QSTR(MP_QSTR_ESP_GPIO0), MP_ROM_PTR(&pin_PA13) },
+  { MP_ROM_QSTR(MP_QSTR_ESP_CHPD), MP_ROM_PTR(&pin_PA14) },
+  { MP_ROM_QSTR(MP_QSTR_ESP_GPIO13), MP_ROM_PTR(&pin_PA15) },
+};
+MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/stm/boards/espruino_wifi/stm32f4xx_hal_conf.h b/ports/stm/boards/espruino_wifi/stm32f4xx_hal_conf.h
new file mode 100644
index 000000000..18d9d60eb
--- /dev/null
+++ b/ports/stm/boards/espruino_wifi/stm32f4xx_hal_conf.h
@@ -0,0 +1,439 @@
+/**
+  ******************************************************************************
+  * @file    stm32f4xx_hal_conf_template.h
+  * @author  MCD Application Team
+  * @brief   HAL configuration template file. 
+  *          This file should be copied to the application folder and renamed
+  *          to stm32f4xx_hal_conf.h.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */ 
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __STM32F4xx_HAL_CONF_H
+#define __STM32F4xx_HAL_CONF_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+
+/* ########################## Module Selection ############################## */
+/**
+  * @brief This is the list of modules to be used in the HAL driver 
+  */
+#define HAL_MODULE_ENABLED  
+
+#define HAL_ADC_MODULE_ENABLED
+/* #define HAL_CRYP_MODULE_ENABLED   */
+/* #define HAL_CAN_MODULE_ENABLED   */
+/* #define HAL_CRC_MODULE_ENABLED   */
+/* #define HAL_CRYP_MODULE_ENABLED   */
+/* #define HAL_DAC_MODULE_ENABLED   */
+/* #define HAL_DCMI_MODULE_ENABLED   */
+/* #define HAL_DMA2D_MODULE_ENABLED   */
+/* #define HAL_ETH_MODULE_ENABLED   */
+/* #define HAL_NAND_MODULE_ENABLED   */
+/* #define HAL_NOR_MODULE_ENABLED   */
+/* #define HAL_PCCARD_MODULE_ENABLED   */
+/* #define HAL_SRAM_MODULE_ENABLED   */
+/* #define HAL_SDRAM_MODULE_ENABLED   */
+/* #define HAL_HASH_MODULE_ENABLED   */
+#define HAL_I2C_MODULE_ENABLED
+#define HAL_I2S_MODULE_ENABLED
+/* #define HAL_IWDG_MODULE_ENABLED   */
+/* #define HAL_LTDC_MODULE_ENABLED   */
+/* #define HAL_RNG_MODULE_ENABLED   */
+/* #define HAL_RTC_MODULE_ENABLED   */
+/* #define HAL_SAI_MODULE_ENABLED   */
+/* #define HAL_SD_MODULE_ENABLED   */
+/* #define HAL_MMC_MODULE_ENABLED   */
+#define HAL_SPI_MODULE_ENABLED
+#define HAL_TIM_MODULE_ENABLED
+#define HAL_UART_MODULE_ENABLED   
+/* #define HAL_USART_MODULE_ENABLED   */
+/* #define HAL_IRDA_MODULE_ENABLED   */
+/* #define HAL_SMARTCARD_MODULE_ENABLED   */
+/* #define HAL_WWDG_MODULE_ENABLED   */
+#define HAL_PCD_MODULE_ENABLED
+/* #define HAL_HCD_MODULE_ENABLED   */
+/* #define HAL_DSI_MODULE_ENABLED   */
+/* #define HAL_QSPI_MODULE_ENABLED   */
+/* #define HAL_QSPI_MODULE_ENABLED   */
+/* #define HAL_CEC_MODULE_ENABLED   */
+/* #define HAL_FMPI2C_MODULE_ENABLED   */
+/* #define HAL_SPDIFRX_MODULE_ENABLED   */
+/* #define HAL_DFSDM_MODULE_ENABLED   */
+/* #define HAL_LPTIM_MODULE_ENABLED   */
+/* #define HAL_EXTI_MODULE_ENABLED   */
+#define HAL_GPIO_MODULE_ENABLED
+#define HAL_EXTI_MODULE_ENABLED
+#define HAL_DMA_MODULE_ENABLED
+#define HAL_RCC_MODULE_ENABLED
+#define HAL_FLASH_MODULE_ENABLED
+#define HAL_PWR_MODULE_ENABLED
+#define HAL_CORTEX_MODULE_ENABLED
+
+/* ########################## HSE/HSI Values adaptation ##################### */
+/**
+  * @brief Adjust the value of External High Speed oscillator (HSE) used in your application.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSE is used as system clock source, directly or through the PLL).  
+  */
+#if !defined  (HSE_VALUE) 
+  #define HSE_VALUE    ((uint32_t)8000000U) /*!< Value of the External oscillator in Hz */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSE_STARTUP_TIMEOUT)
+  #define HSE_STARTUP_TIMEOUT    ((uint32_t)100U)   /*!< Time out for HSE start up, in ms */
+#endif /* HSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief Internal High Speed oscillator (HSI) value.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSI is used as system clock source, directly or through the PLL). 
+  */
+#if !defined  (HSI_VALUE)
+  #define HSI_VALUE    ((uint32_t)16000000U) /*!< Value of the Internal oscillator in Hz*/
+#endif /* HSI_VALUE */
+
+/**
+  * @brief Internal Low Speed oscillator (LSI) value.
+  */
+#if !defined  (LSI_VALUE) 
+ #define LSI_VALUE  ((uint32_t)32000U)       /*!< LSI Typical Value in Hz*/
+#endif /* LSI_VALUE */                      /*!< Value of the Internal Low Speed oscillator in Hz
+                                             The real value may vary depending on the variations
+                                             in voltage and temperature.*/
+/**
+  * @brief External Low Speed oscillator (LSE) value.
+  */
+#if !defined  (LSE_VALUE)
+ #define LSE_VALUE  ((uint32_t)32768U)    /*!< Value of the External Low Speed oscillator in Hz */
+#endif /* LSE_VALUE */
+
+#if !defined  (LSE_STARTUP_TIMEOUT)
+  #define LSE_STARTUP_TIMEOUT    ((uint32_t)5000U)   /*!< Time out for LSE start up, in ms */
+#endif /* LSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief External clock source for I2S peripheral
+  *        This value is used by the I2S HAL module to compute the I2S clock source 
+  *        frequency, this source is inserted directly through I2S_CKIN pad. 
+  */
+#if !defined  (EXTERNAL_CLOCK_VALUE)
+  #define EXTERNAL_CLOCK_VALUE    ((uint32_t)12288000U) /*!< Value of the External audio frequency in Hz*/
+#endif /* EXTERNAL_CLOCK_VALUE */
+
+/* Tip: To avoid modifying this file each time you need to use different HSE,
+   ===  you can define the HSE value in your toolchain compiler preprocessor. */
+
+/* ########################### System Configuration ######################### */
+/**
+  * @brief This is the HAL system configuration section
+  */
+#define  VDD_VALUE		      ((uint32_t)3300U) /*!< Value of VDD in mv */           
+#define  TICK_INT_PRIORITY            ((uint32_t)0U)   /*!< tick interrupt priority */            
+#define  USE_RTOS                     0U     
+#define  PREFETCH_ENABLE              1U
+#define  INSTRUCTION_CACHE_ENABLE     1U
+#define  DATA_CACHE_ENABLE            1U
+
+/* ########################## Assert Selection ############################## */
+/**
+  * @brief Uncomment the line below to expanse the "assert_param" macro in the 
+  *        HAL drivers code
+  */
+/* #define USE_FULL_ASSERT    1U */
+
+/* ################## Ethernet peripheral configuration ##################### */
+
+/* Section 1 : Ethernet peripheral configuration */
+
+/* MAC ADDRESS: MAC_ADDR0:MAC_ADDR1:MAC_ADDR2:MAC_ADDR3:MAC_ADDR4:MAC_ADDR5 */
+#define MAC_ADDR0   2U
+#define MAC_ADDR1   0U
+#define MAC_ADDR2   0U
+#define MAC_ADDR3   0U
+#define MAC_ADDR4   0U
+#define MAC_ADDR5   0U
+
+/* Definition of the Ethernet driver buffers size and count */   
+#define ETH_RX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for receive               */
+#define ETH_TX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for transmit              */
+#define ETH_RXBUFNB                    ((uint32_t)4U)       /* 4 Rx buffers of size ETH_RX_BUF_SIZE  */
+#define ETH_TXBUFNB                    ((uint32_t)4U)       /* 4 Tx buffers of size ETH_TX_BUF_SIZE  */
+
+/* Section 2: PHY configuration section */
+
+/* DP83848_PHY_ADDRESS Address*/ 
+#define DP83848_PHY_ADDRESS           0x01U
+/* PHY Reset delay these values are based on a 1 ms Systick interrupt*/ 
+#define PHY_RESET_DELAY                 ((uint32_t)0x000000FFU)
+/* PHY Configuration delay */
+#define PHY_CONFIG_DELAY                ((uint32_t)0x00000FFFU)
+
+#define PHY_READ_TO                     ((uint32_t)0x0000FFFFU)
+#define PHY_WRITE_TO                    ((uint32_t)0x0000FFFFU)
+
+/* Section 3: Common PHY Registers */
+
+#define PHY_BCR                         ((uint16_t)0x0000U)    /*!< Transceiver Basic Control Register   */
+#define PHY_BSR                         ((uint16_t)0x0001U)    /*!< Transceiver Basic Status Register    */
+ 
+#define PHY_RESET                       ((uint16_t)0x8000U)  /*!< PHY Reset */
+#define PHY_LOOPBACK                    ((uint16_t)0x4000U)  /*!< Select loop-back mode */
+#define PHY_FULLDUPLEX_100M             ((uint16_t)0x2100U)  /*!< Set the full-duplex mode at 100 Mb/s */
+#define PHY_HALFDUPLEX_100M             ((uint16_t)0x2000U)  /*!< Set the half-duplex mode at 100 Mb/s */
+#define PHY_FULLDUPLEX_10M              ((uint16_t)0x0100U)  /*!< Set the full-duplex mode at 10 Mb/s  */
+#define PHY_HALFDUPLEX_10M              ((uint16_t)0x0000U)  /*!< Set the half-duplex mode at 10 Mb/s  */
+#define PHY_AUTONEGOTIATION             ((uint16_t)0x1000U)  /*!< Enable auto-negotiation function     */
+#define PHY_RESTART_AUTONEGOTIATION     ((uint16_t)0x0200U)  /*!< Restart auto-negotiation function    */
+#define PHY_POWERDOWN                   ((uint16_t)0x0800U)  /*!< Select the power down mode           */
+#define PHY_ISOLATE                     ((uint16_t)0x0400U)  /*!< Isolate PHY from MII                 */
+
+#define PHY_AUTONEGO_COMPLETE           ((uint16_t)0x0020U)  /*!< Auto-Negotiation process completed   */
+#define PHY_LINKED_STATUS               ((uint16_t)0x0004U)  /*!< Valid link established               */
+#define PHY_JABBER_DETECTION            ((uint16_t)0x0002U)  /*!< Jabber condition detected            */
+  
+/* Section 4: Extended PHY Registers */
+#define PHY_SR                          ((uint16_t)0x10U)    /*!< PHY status register Offset                      */
+
+#define PHY_SPEED_STATUS                ((uint16_t)0x0002U)  /*!< PHY Speed mask                                  */
+#define PHY_DUPLEX_STATUS               ((uint16_t)0x0004U)  /*!< PHY Duplex mask                                 */
+
+/* ################## SPI peripheral configuration ########################## */
+
+/* CRC FEATURE: Use to activate CRC feature inside HAL SPI Driver
+* Activated: CRC code is present inside driver
+* Deactivated: CRC code cleaned from driver
+*/
+
+#define USE_SPI_CRC                     0U
+
+/* Includes ------------------------------------------------------------------*/
+/**
+  * @brief Include module's header file 
+  */
+
+#ifdef HAL_RCC_MODULE_ENABLED
+  #include "stm32f4xx_hal_rcc.h"
+#endif /* HAL_RCC_MODULE_ENABLED */
+
+#ifdef HAL_EXTI_MODULE_ENABLED
+  #include "stm32f4xx_hal_exti.h"
+#endif /* HAL_EXTI_MODULE_ENABLED */
+
+#ifdef HAL_GPIO_MODULE_ENABLED
+  #include "stm32f4xx_hal_gpio.h"
+#endif /* HAL_GPIO_MODULE_ENABLED */
+
+#ifdef HAL_DMA_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma.h"
+#endif /* HAL_DMA_MODULE_ENABLED */
+   
+#ifdef HAL_CORTEX_MODULE_ENABLED
+  #include "stm32f4xx_hal_cortex.h"
+#endif /* HAL_CORTEX_MODULE_ENABLED */
+
+#ifdef HAL_ADC_MODULE_ENABLED
+  #include "stm32f4xx_hal_adc.h"
+#endif /* HAL_ADC_MODULE_ENABLED */
+
+#ifdef HAL_CAN_MODULE_ENABLED
+  #include "stm32f4xx_hal_can.h"
+#endif /* HAL_CAN_MODULE_ENABLED */
+
+#ifdef HAL_CRC_MODULE_ENABLED
+  #include "stm32f4xx_hal_crc.h"
+#endif /* HAL_CRC_MODULE_ENABLED */
+
+#ifdef HAL_CRYP_MODULE_ENABLED
+  #include "stm32f4xx_hal_cryp.h" 
+#endif /* HAL_CRYP_MODULE_ENABLED */
+
+#ifdef HAL_DMA2D_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma2d.h"
+#endif /* HAL_DMA2D_MODULE_ENABLED */
+
+#ifdef HAL_DAC_MODULE_ENABLED
+  #include "stm32f4xx_hal_dac.h"
+#endif /* HAL_DAC_MODULE_ENABLED */
+
+#ifdef HAL_DCMI_MODULE_ENABLED
+  #include "stm32f4xx_hal_dcmi.h"
+#endif /* HAL_DCMI_MODULE_ENABLED */
+
+#ifdef HAL_ETH_MODULE_ENABLED
+  #include "stm32f4xx_hal_eth.h"
+#endif /* HAL_ETH_MODULE_ENABLED */
+
+#ifdef HAL_FLASH_MODULE_ENABLED
+  #include "stm32f4xx_hal_flash.h"
+#endif /* HAL_FLASH_MODULE_ENABLED */
+ 
+#ifdef HAL_SRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sram.h"
+#endif /* HAL_SRAM_MODULE_ENABLED */
+
+#ifdef HAL_NOR_MODULE_ENABLED
+  #include "stm32f4xx_hal_nor.h"
+#endif /* HAL_NOR_MODULE_ENABLED */
+
+#ifdef HAL_NAND_MODULE_ENABLED
+  #include "stm32f4xx_hal_nand.h"
+#endif /* HAL_NAND_MODULE_ENABLED */
+
+#ifdef HAL_PCCARD_MODULE_ENABLED
+  #include "stm32f4xx_hal_pccard.h"
+#endif /* HAL_PCCARD_MODULE_ENABLED */ 
+  
+#ifdef HAL_SDRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sdram.h"
+#endif /* HAL_SDRAM_MODULE_ENABLED */      
+
+#ifdef HAL_HASH_MODULE_ENABLED
+ #include "stm32f4xx_hal_hash.h"
+#endif /* HAL_HASH_MODULE_ENABLED */
+
+#ifdef HAL_I2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2c.h"
+#endif /* HAL_I2C_MODULE_ENABLED */
+
+#ifdef HAL_I2S_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2s.h"
+#endif /* HAL_I2S_MODULE_ENABLED */
+
+#ifdef HAL_IWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_iwdg.h"
+#endif /* HAL_IWDG_MODULE_ENABLED */
+
+#ifdef HAL_LTDC_MODULE_ENABLED
+ #include "stm32f4xx_hal_ltdc.h"
+#endif /* HAL_LTDC_MODULE_ENABLED */
+
+#ifdef HAL_PWR_MODULE_ENABLED
+ #include "stm32f4xx_hal_pwr.h"
+#endif /* HAL_PWR_MODULE_ENABLED */
+
+#ifdef HAL_RNG_MODULE_ENABLED
+ #include "stm32f4xx_hal_rng.h"
+#endif /* HAL_RNG_MODULE_ENABLED */
+
+#ifdef HAL_RTC_MODULE_ENABLED
+ #include "stm32f4xx_hal_rtc.h"
+#endif /* HAL_RTC_MODULE_ENABLED */
+
+#ifdef HAL_SAI_MODULE_ENABLED
+ #include "stm32f4xx_hal_sai.h"
+#endif /* HAL_SAI_MODULE_ENABLED */
+
+#ifdef HAL_SD_MODULE_ENABLED
+ #include "stm32f4xx_hal_sd.h"
+#endif /* HAL_SD_MODULE_ENABLED */
+
+#ifdef HAL_MMC_MODULE_ENABLED
+ #include "stm32f4xx_hal_mmc.h"
+#endif /* HAL_MMC_MODULE_ENABLED */
+
+#ifdef HAL_SPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_spi.h"
+#endif /* HAL_SPI_MODULE_ENABLED */
+
+#ifdef HAL_TIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_tim.h"
+#endif /* HAL_TIM_MODULE_ENABLED */
+
+#ifdef HAL_UART_MODULE_ENABLED
+ #include "stm32f4xx_hal_uart.h"
+#endif /* HAL_UART_MODULE_ENABLED */
+
+#ifdef HAL_USART_MODULE_ENABLED
+ #include "stm32f4xx_hal_usart.h"
+#endif /* HAL_USART_MODULE_ENABLED */
+
+#ifdef HAL_IRDA_MODULE_ENABLED
+ #include "stm32f4xx_hal_irda.h"
+#endif /* HAL_IRDA_MODULE_ENABLED */
+
+#ifdef HAL_SMARTCARD_MODULE_ENABLED
+ #include "stm32f4xx_hal_smartcard.h"
+#endif /* HAL_SMARTCARD_MODULE_ENABLED */
+
+#ifdef HAL_WWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_wwdg.h"
+#endif /* HAL_WWDG_MODULE_ENABLED */
+
+#ifdef HAL_PCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_pcd.h"
+#endif /* HAL_PCD_MODULE_ENABLED */
+
+#ifdef HAL_HCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_hcd.h"
+#endif /* HAL_HCD_MODULE_ENABLED */
+   
+#ifdef HAL_DSI_MODULE_ENABLED
+ #include "stm32f4xx_hal_dsi.h"
+#endif /* HAL_DSI_MODULE_ENABLED */
+
+#ifdef HAL_QSPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_qspi.h"
+#endif /* HAL_QSPI_MODULE_ENABLED */
+
+#ifdef HAL_CEC_MODULE_ENABLED
+ #include "stm32f4xx_hal_cec.h"
+#endif /* HAL_CEC_MODULE_ENABLED */
+
+#ifdef HAL_FMPI2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_fmpi2c.h"
+#endif /* HAL_FMPI2C_MODULE_ENABLED */
+
+#ifdef HAL_SPDIFRX_MODULE_ENABLED
+ #include "stm32f4xx_hal_spdifrx.h"
+#endif /* HAL_SPDIFRX_MODULE_ENABLED */
+
+#ifdef HAL_DFSDM_MODULE_ENABLED
+ #include "stm32f4xx_hal_dfsdm.h"
+#endif /* HAL_DFSDM_MODULE_ENABLED */
+
+#ifdef HAL_LPTIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_lptim.h"
+#endif /* HAL_LPTIM_MODULE_ENABLED */
+   
+/* Exported macro ------------------------------------------------------------*/
+#ifdef  USE_FULL_ASSERT
+/**
+  * @brief  The assert_param macro is used for function's parameters check.
+  * @param  expr: If expr is false, it calls assert_failed function
+  *         which reports the name of the source file and the source
+  *         line number of the call that failed. 
+  *         If expr is true, it returns no value.
+  * @retval None
+  */
+  #define assert_param(expr) ((expr) ? (void)0U : assert_failed((uint8_t *)__FILE__, __LINE__))
+/* Exported functions ------------------------------------------------------- */
+  void assert_failed(uint8_t* file, uint32_t line);
+#else
+  #define assert_param(expr) ((void)0U)
+#endif /* USE_FULL_ASSERT */    
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __STM32F4xx_HAL_CONF_H */
+ 
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/ports/stm/boards/feather_stm32f405_express/board.c b/ports/stm/boards/feather_stm32f405_express/board.c
new file mode 100644
index 000000000..82b0c506e
--- /dev/null
+++ b/ports/stm/boards/feather_stm32f405_express/board.c
@@ -0,0 +1,39 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "boards/board.h"
+#include "mpconfigboard.h"
+
+void board_init(void) {
+}
+
+bool board_requests_safe_mode(void) {
+    return false;
+}
+
+void reset_board(void) {
+
+}
diff --git a/ports/stm/boards/feather_stm32f405_express/mpconfigboard.h b/ports/stm/boards/feather_stm32f405_express/mpconfigboard.h
new file mode 100644
index 000000000..6600fcf67
--- /dev/null
+++ b/ports/stm/boards/feather_stm32f405_express/mpconfigboard.h
@@ -0,0 +1,58 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+//Micropython setup
+
+#define MICROPY_HW_BOARD_NAME       "Feather STM32F405 Express"
+#define MICROPY_HW_MCU_NAME         "STM32F405RG"
+
+#define FLASH_SIZE                  (0x100000)
+#define FLASH_PAGE_SIZE             (0x4000)
+
+#define MICROPY_HW_NEOPIXEL (&pin_PC00)
+
+#define BOARD_OSC_DIV (12)
+
+// On-board flash
+#define SPI_FLASH_MOSI_PIN          (&pin_PB05)
+#define SPI_FLASH_MISO_PIN          (&pin_PB04)
+#define SPI_FLASH_SCK_PIN           (&pin_PB03)
+#define SPI_FLASH_CS_PIN            (&pin_PA15)
+
+// Bootloader only
+#ifdef UF2_BOOTLOADER_ENABLED
+    #define BOARD_VTOR_DEFER (1) //Leave VTOR relocation to bootloader
+#endif
+
+#define DEFAULT_I2C_BUS_SCL (&pin_PB06)
+#define DEFAULT_I2C_BUS_SDA (&pin_PB07)
+
+#define DEFAULT_SPI_BUS_SCK (&pin_PB13)
+#define DEFAULT_SPI_BUS_MOSI (&pin_PB15)
+#define DEFAULT_SPI_BUS_MISO (&pin_PB14)
+
+#define DEFAULT_UART_BUS_RX (&pin_PB11)
+#define DEFAULT_UART_BUS_TX (&pin_PB10)
diff --git a/ports/stm/boards/feather_stm32f405_express/mpconfigboard.mk b/ports/stm/boards/feather_stm32f405_express/mpconfigboard.mk
new file mode 100644
index 000000000..312ca6b48
--- /dev/null
+++ b/ports/stm/boards/feather_stm32f405_express/mpconfigboard.mk
@@ -0,0 +1,22 @@
+USB_VID = 0x239A
+USB_PID = 0x805A
+USB_PRODUCT = "Feather STM32F405 Express"
+USB_MANUFACTURER = "Adafruit Industries LLC"
+USB_DEVICES = "CDC,MSC"
+
+SPI_FLASH_FILESYSTEM = 1
+EXTERNAL_FLASH_DEVICE_COUNT = 1
+EXTERNAL_FLASH_DEVICES = GD25Q16C
+LONGINT_IMPL = MPZ
+
+MCU_SERIES = m4
+MCU_VARIANT = stm32f4
+MCU_SUB_VARIANT = stm32f405xx
+MCU_PACKAGE = 64
+CMSIS_MCU = STM32F405xx
+
+# Default includes filesystem, but uses external flash
+LD_DEFAULT = boards/STM32F405_default.ld 
+LD_BOOT = boards/STM32F405_boot.ld # UF2 boot option
+UF2_OFFSET = 0x8010000
+
diff --git a/ports/stm/boards/feather_stm32f405_express/pins.c b/ports/stm/boards/feather_stm32f405_express/pins.c
new file mode 100644
index 000000000..ebc8fa337
--- /dev/null
+++ b/ports/stm/boards/feather_stm32f405_express/pins.c
@@ -0,0 +1,35 @@
+#include "shared-bindings/board/__init__.h"
+
+STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA04) },
+    { MP_ROM_QSTR(MP_QSTR_A1), MP_ROM_PTR(&pin_PA05) },
+    { MP_ROM_QSTR(MP_QSTR_A2), MP_ROM_PTR(&pin_PA06) },
+    { MP_ROM_QSTR(MP_QSTR_A3), MP_ROM_PTR(&pin_PA07) },
+    { MP_ROM_QSTR(MP_QSTR_A4), MP_ROM_PTR(&pin_PC04) },
+    { MP_ROM_QSTR(MP_QSTR_A5), MP_ROM_PTR(&pin_PC05) },
+    { MP_ROM_QSTR(MP_QSTR_VOLTAGE_MONITOR), MP_ROM_PTR(&pin_PA03) },
+
+    { MP_ROM_QSTR(MP_QSTR_D5), MP_ROM_PTR(&pin_PC07) },
+    { MP_ROM_QSTR(MP_QSTR_D6), MP_ROM_PTR(&pin_PC06) },
+    { MP_ROM_QSTR(MP_QSTR_D9), MP_ROM_PTR(&pin_PB08) },
+    { MP_ROM_QSTR(MP_QSTR_D10), MP_ROM_PTR(&pin_PB09) },
+    { MP_ROM_QSTR(MP_QSTR_D11), MP_ROM_PTR(&pin_PC03) },
+    { MP_ROM_QSTR(MP_QSTR_D12), MP_ROM_PTR(&pin_PC02) },
+    { MP_ROM_QSTR(MP_QSTR_D13), MP_ROM_PTR(&pin_PC01) },
+
+    { MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_PB07) },
+    { MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_PB06) },
+
+    { MP_ROM_QSTR(MP_QSTR_SCK), MP_ROM_PTR(&pin_PB13) },
+    { MP_ROM_QSTR(MP_QSTR_MISO), MP_ROM_PTR(&pin_PB14) },
+    { MP_ROM_QSTR(MP_QSTR_MOSI), MP_ROM_PTR(&pin_PB15) },
+
+    { MP_ROM_QSTR(MP_QSTR_TX), MP_ROM_PTR(&pin_PB10) },
+    { MP_ROM_QSTR(MP_QSTR_RX), MP_ROM_PTR(&pin_PB11) },
+
+    { MP_ROM_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_PC00) },
+    { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
+    { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
+};
+MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/stm/boards/feather_stm32f405_express/stm32f4xx_hal_conf.h b/ports/stm/boards/feather_stm32f405_express/stm32f4xx_hal_conf.h
new file mode 100644
index 000000000..8031403a9
--- /dev/null
+++ b/ports/stm/boards/feather_stm32f405_express/stm32f4xx_hal_conf.h
@@ -0,0 +1,440 @@
+/**
+  ******************************************************************************
+  * @file    stm32f4xx_hal_conf_template.h
+  * @author  MCD Application Team
+  * @brief   HAL configuration template file. 
+  *          This file should be copied to the application folder and renamed
+  *          to stm32f4xx_hal_conf.h.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */ 
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __STM32F4xx_HAL_CONF_H
+#define __STM32F4xx_HAL_CONF_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+
+/* ########################## Module Selection ############################## */
+/**
+  * @brief This is the list of modules to be used in the HAL driver 
+  */
+#define HAL_MODULE_ENABLED  
+
+#define HAL_ADC_MODULE_ENABLED
+/* #define HAL_CRYP_MODULE_ENABLED   */
+/* #define HAL_CAN_MODULE_ENABLED   */
+/* #define HAL_CRC_MODULE_ENABLED   */
+/* #define HAL_CRYP_MODULE_ENABLED   */
+#define HAL_DAC_MODULE_ENABLED
+/* #define HAL_DCMI_MODULE_ENABLED   */
+/* #define HAL_DMA2D_MODULE_ENABLED   */
+/* #define HAL_ETH_MODULE_ENABLED   */
+/* #define HAL_NAND_MODULE_ENABLED   */
+/* #define HAL_NOR_MODULE_ENABLED   */
+/* #define HAL_PCCARD_MODULE_ENABLED   */
+/* #define HAL_SRAM_MODULE_ENABLED   */
+/* #define HAL_SDRAM_MODULE_ENABLED   */
+/* #define HAL_HASH_MODULE_ENABLED   */
+#define HAL_I2C_MODULE_ENABLED
+#define HAL_I2S_MODULE_ENABLED
+/* #define HAL_IWDG_MODULE_ENABLED   */
+/* #define HAL_LTDC_MODULE_ENABLED   */
+#define HAL_RNG_MODULE_ENABLED
+/* #define HAL_RTC_MODULE_ENABLED   */
+/* #define HAL_SAI_MODULE_ENABLED   */
+/* #define HAL_SD_MODULE_ENABLED   */
+/* #define HAL_MMC_MODULE_ENABLED   */
+#define HAL_SPI_MODULE_ENABLED
+#define HAL_TIM_MODULE_ENABLED
+#define HAL_UART_MODULE_ENABLED   
+#define HAL_USART_MODULE_ENABLED
+/* #define HAL_IRDA_MODULE_ENABLED   */
+/* #define HAL_SMARTCARD_MODULE_ENABLED   */
+/* #define HAL_WWDG_MODULE_ENABLED   */
+#define HAL_PCD_MODULE_ENABLED
+/* #define HAL_HCD_MODULE_ENABLED   */
+/* #define HAL_DSI_MODULE_ENABLED   */
+/* #define HAL_QSPI_MODULE_ENABLED   */
+/* #define HAL_QSPI_MODULE_ENABLED   */
+/* #define HAL_CEC_MODULE_ENABLED   */
+/* #define HAL_FMPI2C_MODULE_ENABLED   */
+/* #define HAL_SPDIFRX_MODULE_ENABLED   */
+/* #define HAL_DFSDM_MODULE_ENABLED   */
+/* #define HAL_LPTIM_MODULE_ENABLED   */
+/* #define HAL_EXTI_MODULE_ENABLED   */
+#define HAL_GPIO_MODULE_ENABLED
+#define HAL_EXTI_MODULE_ENABLED
+#define HAL_DMA_MODULE_ENABLED
+#define HAL_RCC_MODULE_ENABLED
+#define HAL_FLASH_MODULE_ENABLED
+#define HAL_PWR_MODULE_ENABLED
+#define HAL_CORTEX_MODULE_ENABLED
+
+/* ########################## HSE/HSI Values adaptation ##################### */
+/**
+  * @brief Adjust the value of External High Speed oscillator (HSE) used in your application.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSE is used as system clock source, directly or through the PLL).  
+  */
+#if !defined  (HSE_VALUE) 
+  #define HSE_VALUE    ((uint32_t)12000000) /*!< Value of the External oscillator in Hz */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSE_STARTUP_TIMEOUT)
+  #define HSE_STARTUP_TIMEOUT    ((uint32_t)100U)   /*!< Time out for HSE start up, in ms */
+#endif /* HSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief Internal High Speed oscillator (HSI) value.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSI is used as system clock source, directly or through the PLL). 
+  */
+#if !defined  (HSI_VALUE)
+  #define HSI_VALUE    ((uint32_t)16000000) /*!< Value of the Internal oscillator in Hz*/
+#endif /* HSI_VALUE */
+
+/**
+  * @brief Internal Low Speed oscillator (LSI) value.
+  */
+#if !defined  (LSI_VALUE) 
+ #define LSI_VALUE  ((uint32_t)40000)    
+#endif /* LSI_VALUE */                      /*!< Value of the Internal Low Speed oscillator in Hz
+                                             The real value may vary depending on the variations
+                                             in voltage and temperature.  */
+/**
+  * @brief External Low Speed oscillator (LSE) value.
+  */
+#if !defined  (LSE_VALUE)
+ #define LSE_VALUE  ((uint32_t)32768)    /*!< Value of the External Low Speed oscillator in Hz */
+#endif /* LSE_VALUE */
+
+#if !defined  (LSE_STARTUP_TIMEOUT)
+  #define LSE_STARTUP_TIMEOUT    ((uint32_t)5000U)   /*!< Time out for LSE start up, in ms */
+#endif /* LSE_STARTUP_TIMEOUT */
+
+
+/**
+  * @brief External clock source for I2S peripheral
+  *        This value is used by the I2S HAL module to compute the I2S clock source 
+  *        frequency, this source is inserted directly through I2S_CKIN pad. 
+  */
+#if !defined  (EXTERNAL_CLOCK_VALUE)
+  #define EXTERNAL_CLOCK_VALUE    ((uint32_t)12288000U) /*!< Value of the External audio frequency in Hz*/
+#endif /* EXTERNAL_CLOCK_VALUE */
+
+/* Tip: To avoid modifying this file each time you need to use different HSE,
+   ===  you can define the HSE value in your toolchain compiler preprocessor. */
+
+/* ########################### System Configuration ######################### */
+/**
+  * @brief This is the HAL system configuration section
+  */
+#define  VDD_VALUE          ((uint32_t)3300U) /*!< Value of VDD in mv */           
+#define  TICK_INT_PRIORITY            ((uint32_t)0U)   /*!< tick interrupt priority */            
+#define  USE_RTOS                     0U     
+#define  PREFETCH_ENABLE              1U
+#define  INSTRUCTION_CACHE_ENABLE     1U
+#define  DATA_CACHE_ENABLE            1U
+
+/* ########################## Assert Selection ############################## */
+/**
+  * @brief Uncomment the line below to expanse the "assert_param" macro in the 
+  *        HAL drivers code
+  */
+/* #define USE_FULL_ASSERT    1U */
+
+/* ################## Ethernet peripheral configuration ##################### */
+
+/* Section 1 : Ethernet peripheral configuration */
+
+/* MAC ADDRESS: MAC_ADDR0:MAC_ADDR1:MAC_ADDR2:MAC_ADDR3:MAC_ADDR4:MAC_ADDR5 */
+#define MAC_ADDR0   2U
+#define MAC_ADDR1   0U
+#define MAC_ADDR2   0U
+#define MAC_ADDR3   0U
+#define MAC_ADDR4   0U
+#define MAC_ADDR5   0U
+
+/* Definition of the Ethernet driver buffers size and count */   
+#define ETH_RX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for receive               */
+#define ETH_TX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for transmit              */
+#define ETH_RXBUFNB                    ((uint32_t)4U)       /* 4 Rx buffers of size ETH_RX_BUF_SIZE  */
+#define ETH_TXBUFNB                    ((uint32_t)4U)       /* 4 Tx buffers of size ETH_TX_BUF_SIZE  */
+
+/* Section 2: PHY configuration section */
+
+/* DP83848_PHY_ADDRESS Address*/ 
+#define DP83848_PHY_ADDRESS           0x01U
+/* PHY Reset delay these values are based on a 1 ms Systick interrupt*/ 
+#define PHY_RESET_DELAY                 ((uint32_t)0x000000FFU)
+/* PHY Configuration delay */
+#define PHY_CONFIG_DELAY                ((uint32_t)0x00000FFFU)
+
+#define PHY_READ_TO                     ((uint32_t)0x0000FFFFU)
+#define PHY_WRITE_TO                    ((uint32_t)0x0000FFFFU)
+
+/* Section 3: Common PHY Registers */
+
+#define PHY_BCR                         ((uint16_t)0x0000U)    /*!< Transceiver Basic Control Register   */
+#define PHY_BSR                         ((uint16_t)0x0001U)    /*!< Transceiver Basic Status Register    */
+ 
+#define PHY_RESET                       ((uint16_t)0x8000U)  /*!< PHY Reset */
+#define PHY_LOOPBACK                    ((uint16_t)0x4000U)  /*!< Select loop-back mode */
+#define PHY_FULLDUPLEX_100M             ((uint16_t)0x2100U)  /*!< Set the full-duplex mode at 100 Mb/s */
+#define PHY_HALFDUPLEX_100M             ((uint16_t)0x2000U)  /*!< Set the half-duplex mode at 100 Mb/s */
+#define PHY_FULLDUPLEX_10M              ((uint16_t)0x0100U)  /*!< Set the full-duplex mode at 10 Mb/s  */
+#define PHY_HALFDUPLEX_10M              ((uint16_t)0x0000U)  /*!< Set the half-duplex mode at 10 Mb/s  */
+#define PHY_AUTONEGOTIATION             ((uint16_t)0x1000U)  /*!< Enable auto-negotiation function     */
+#define PHY_RESTART_AUTONEGOTIATION     ((uint16_t)0x0200U)  /*!< Restart auto-negotiation function    */
+#define PHY_POWERDOWN                   ((uint16_t)0x0800U)  /*!< Select the power down mode           */
+#define PHY_ISOLATE                     ((uint16_t)0x0400U)  /*!< Isolate PHY from MII                 */
+
+#define PHY_AUTONEGO_COMPLETE           ((uint16_t)0x0020U)  /*!< Auto-Negotiation process completed   */
+#define PHY_LINKED_STATUS               ((uint16_t)0x0004U)  /*!< Valid link established               */
+#define PHY_JABBER_DETECTION            ((uint16_t)0x0002U)  /*!< Jabber condition detected            */
+  
+/* Section 4: Extended PHY Registers */
+#define PHY_SR                          ((uint16_t)0x10U)    /*!< PHY status register Offset                      */
+
+#define PHY_SPEED_STATUS                ((uint16_t)0x0002U)  /*!< PHY Speed mask                                  */
+#define PHY_DUPLEX_STATUS               ((uint16_t)0x0004U)  /*!< PHY Duplex mask                                 */
+
+/* ################## SPI peripheral configuration ########################## */
+
+/* CRC FEATURE: Use to activate CRC feature inside HAL SPI Driver
+* Activated: CRC code is present inside driver
+* Deactivated: CRC code cleaned from driver
+*/
+
+#define USE_SPI_CRC                     0U
+
+/* Includes ------------------------------------------------------------------*/
+/**
+  * @brief Include module's header file 
+  */
+
+#ifdef HAL_RCC_MODULE_ENABLED
+  #include "stm32f4xx_hal_rcc.h"
+#endif /* HAL_RCC_MODULE_ENABLED */
+
+#ifdef HAL_EXTI_MODULE_ENABLED
+  #include "stm32f4xx_hal_exti.h"
+#endif /* HAL_EXTI_MODULE_ENABLED */
+
+#ifdef HAL_GPIO_MODULE_ENABLED
+  #include "stm32f4xx_hal_gpio.h"
+#endif /* HAL_GPIO_MODULE_ENABLED */
+
+#ifdef HAL_DMA_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma.h"
+#endif /* HAL_DMA_MODULE_ENABLED */
+   
+#ifdef HAL_CORTEX_MODULE_ENABLED
+  #include "stm32f4xx_hal_cortex.h"
+#endif /* HAL_CORTEX_MODULE_ENABLED */
+
+#ifdef HAL_ADC_MODULE_ENABLED
+  #include "stm32f4xx_hal_adc.h"
+#endif /* HAL_ADC_MODULE_ENABLED */
+
+#ifdef HAL_CAN_MODULE_ENABLED
+  #include "stm32f4xx_hal_can.h"
+#endif /* HAL_CAN_MODULE_ENABLED */
+
+#ifdef HAL_CRC_MODULE_ENABLED
+  #include "stm32f4xx_hal_crc.h"
+#endif /* HAL_CRC_MODULE_ENABLED */
+
+#ifdef HAL_CRYP_MODULE_ENABLED
+  #include "stm32f4xx_hal_cryp.h" 
+#endif /* HAL_CRYP_MODULE_ENABLED */
+
+#ifdef HAL_DMA2D_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma2d.h"
+#endif /* HAL_DMA2D_MODULE_ENABLED */
+
+#ifdef HAL_DAC_MODULE_ENABLED
+  #include "stm32f4xx_hal_dac.h"
+#endif /* HAL_DAC_MODULE_ENABLED */
+
+#ifdef HAL_DCMI_MODULE_ENABLED
+  #include "stm32f4xx_hal_dcmi.h"
+#endif /* HAL_DCMI_MODULE_ENABLED */
+
+#ifdef HAL_ETH_MODULE_ENABLED
+  #include "stm32f4xx_hal_eth.h"
+#endif /* HAL_ETH_MODULE_ENABLED */
+
+#ifdef HAL_FLASH_MODULE_ENABLED
+  #include "stm32f4xx_hal_flash.h"
+#endif /* HAL_FLASH_MODULE_ENABLED */
+ 
+#ifdef HAL_SRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sram.h"
+#endif /* HAL_SRAM_MODULE_ENABLED */
+
+#ifdef HAL_NOR_MODULE_ENABLED
+  #include "stm32f4xx_hal_nor.h"
+#endif /* HAL_NOR_MODULE_ENABLED */
+
+#ifdef HAL_NAND_MODULE_ENABLED
+  #include "stm32f4xx_hal_nand.h"
+#endif /* HAL_NAND_MODULE_ENABLED */
+
+#ifdef HAL_PCCARD_MODULE_ENABLED
+  #include "stm32f4xx_hal_pccard.h"
+#endif /* HAL_PCCARD_MODULE_ENABLED */ 
+  
+#ifdef HAL_SDRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sdram.h"
+#endif /* HAL_SDRAM_MODULE_ENABLED */      
+
+#ifdef HAL_HASH_MODULE_ENABLED
+ #include "stm32f4xx_hal_hash.h"
+#endif /* HAL_HASH_MODULE_ENABLED */
+
+#ifdef HAL_I2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2c.h"
+#endif /* HAL_I2C_MODULE_ENABLED */
+
+#ifdef HAL_I2S_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2s.h"
+#endif /* HAL_I2S_MODULE_ENABLED */
+
+#ifdef HAL_IWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_iwdg.h"
+#endif /* HAL_IWDG_MODULE_ENABLED */
+
+#ifdef HAL_LTDC_MODULE_ENABLED
+ #include "stm32f4xx_hal_ltdc.h"
+#endif /* HAL_LTDC_MODULE_ENABLED */
+
+#ifdef HAL_PWR_MODULE_ENABLED
+ #include "stm32f4xx_hal_pwr.h"
+#endif /* HAL_PWR_MODULE_ENABLED */
+
+#ifdef HAL_RNG_MODULE_ENABLED
+ #include "stm32f4xx_hal_rng.h"
+#endif /* HAL_RNG_MODULE_ENABLED */
+
+#ifdef HAL_RTC_MODULE_ENABLED
+ #include "stm32f4xx_hal_rtc.h"
+#endif /* HAL_RTC_MODULE_ENABLED */
+
+#ifdef HAL_SAI_MODULE_ENABLED
+ #include "stm32f4xx_hal_sai.h"
+#endif /* HAL_SAI_MODULE_ENABLED */
+
+#ifdef HAL_SD_MODULE_ENABLED
+ #include "stm32f4xx_hal_sd.h"
+#endif /* HAL_SD_MODULE_ENABLED */
+
+#ifdef HAL_MMC_MODULE_ENABLED
+ #include "stm32f4xx_hal_mmc.h"
+#endif /* HAL_MMC_MODULE_ENABLED */
+
+#ifdef HAL_SPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_spi.h"
+#endif /* HAL_SPI_MODULE_ENABLED */
+
+#ifdef HAL_TIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_tim.h"
+#endif /* HAL_TIM_MODULE_ENABLED */
+
+#ifdef HAL_UART_MODULE_ENABLED
+ #include "stm32f4xx_hal_uart.h"
+#endif /* HAL_UART_MODULE_ENABLED */
+
+#ifdef HAL_USART_MODULE_ENABLED
+ #include "stm32f4xx_hal_usart.h"
+#endif /* HAL_USART_MODULE_ENABLED */
+
+#ifdef HAL_IRDA_MODULE_ENABLED
+ #include "stm32f4xx_hal_irda.h"
+#endif /* HAL_IRDA_MODULE_ENABLED */
+
+#ifdef HAL_SMARTCARD_MODULE_ENABLED
+ #include "stm32f4xx_hal_smartcard.h"
+#endif /* HAL_SMARTCARD_MODULE_ENABLED */
+
+#ifdef HAL_WWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_wwdg.h"
+#endif /* HAL_WWDG_MODULE_ENABLED */
+
+#ifdef HAL_PCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_pcd.h"
+#endif /* HAL_PCD_MODULE_ENABLED */
+
+#ifdef HAL_HCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_hcd.h"
+#endif /* HAL_HCD_MODULE_ENABLED */
+   
+#ifdef HAL_DSI_MODULE_ENABLED
+ #include "stm32f4xx_hal_dsi.h"
+#endif /* HAL_DSI_MODULE_ENABLED */
+
+#ifdef HAL_QSPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_qspi.h"
+#endif /* HAL_QSPI_MODULE_ENABLED */
+
+#ifdef HAL_CEC_MODULE_ENABLED
+ #include "stm32f4xx_hal_cec.h"
+#endif /* HAL_CEC_MODULE_ENABLED */
+
+#ifdef HAL_FMPI2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_fmpi2c.h"
+#endif /* HAL_FMPI2C_MODULE_ENABLED */
+
+#ifdef HAL_SPDIFRX_MODULE_ENABLED
+ #include "stm32f4xx_hal_spdifrx.h"
+#endif /* HAL_SPDIFRX_MODULE_ENABLED */
+
+#ifdef HAL_DFSDM_MODULE_ENABLED
+ #include "stm32f4xx_hal_dfsdm.h"
+#endif /* HAL_DFSDM_MODULE_ENABLED */
+
+#ifdef HAL_LPTIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_lptim.h"
+#endif /* HAL_LPTIM_MODULE_ENABLED */
+   
+/* Exported macro ------------------------------------------------------------*/
+#ifdef  USE_FULL_ASSERT
+/**
+  * @brief  The assert_param macro is used for function's parameters check.
+  * @param  expr: If expr is false, it calls assert_failed function
+  *         which reports the name of the source file and the source
+  *         line number of the call that failed. 
+  *         If expr is true, it returns no value.
+  * @retval None
+  */
+  #define assert_param(expr) ((expr) ? (void)0U : assert_failed((uint8_t *)__FILE__, __LINE__))
+/* Exported functions ------------------------------------------------------- */
+  void assert_failed(uint8_t* file, uint32_t line);
+#else
+  #define assert_param(expr) ((void)0U)
+#endif /* USE_FULL_ASSERT */    
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __STM32F4xx_HAL_CONF_H */
+ 
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/ports/stm/boards/meowbit_v121/board.c b/ports/stm/boards/meowbit_v121/board.c
new file mode 100644
index 000000000..a0ae98824
--- /dev/null
+++ b/ports/stm/boards/meowbit_v121/board.c
@@ -0,0 +1,121 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "boards/board.h"
+#include "mpconfigboard.h"
+
+#include "shared-bindings/board/__init__.h"
+#include "shared-bindings/displayio/FourWire.h"
+#include "shared-module/displayio/__init__.h"
+#include "shared-module/displayio/mipi_constants.h"
+#include "shared-bindings/busio/SPI.h"
+
+#include "supervisor/spi_flash_api.h"
+
+#include "tick.h"
+
+displayio_fourwire_obj_t board_display_obj;
+
+#define DELAY 0x80
+
+uint8_t display_init_sequence[] = {
+    0x01, 0 | DELAY, 150, // SWRESET
+	0x11, 0 | DELAY, 255, // SLPOUT
+	0xb1, 3, 0x01, 0x2C, 0x2D, // _FRMCTR1
+	0xb2, 3, 0x01, 0x2C, 0x2D, //
+	0xb3, 6, 0x01, 0x2C, 0x2D, 0x01, 0x2C, 0x2D,
+	0xb4, 1, 0x07, // _INVCTR line inversion
+	0xc0, 3, 0xa2, 0x02, 0x84, // _PWCTR1 GVDD = 4.7V, 1.0uA
+	0xc1, 1, 0xc5, // _PWCTR2 VGH=14.7V, VGL=-7.35V
+	0xc2, 2, 0x0a, 0x00, // _PWCTR3 Opamp current small, Boost frequency
+	0xc3, 2, 0x8a, 0x2a,
+	0xc4, 2, 0x8a, 0xee,
+	0xc5, 1, 0x0e, // _VMCTR1 VCOMH = 4V, VOML = -1.1V
+	0x20, 0, // _INVOFF //MISMATCh 0x2a vs 0x20
+	0x36, 1, 0x18, // _MADCTL bottom to top refresh
+	// 1 clk cycle nonoverlap, 2 cycle gate rise, 3 sycle osc equalie,
+	// fix on VTL
+	0x3a, 1, 0x05, // COLMOD - 16bit color
+	0xe0, 0x10, 0x02, 0x1c, 0x07, 0x12,
+				0x37, 0x32, 0x29, 0x2d,
+				0x29, 0x25, 0x2B, 0x39, 
+				0x00, 0x01, 0x03, 0x10, // _GMCTRP1 Gamma
+	0xe1, 0x10, 0x03, 0x1d, 0x07, 0x06,
+				0x2E, 0x2C, 0x29, 0x2D,
+				0x2E, 0x2E, 0x37, 0x3F,
+				0x00, 0x00, 0x02, 0x10, // _GMCTRN1
+	0x13, 0 | DELAY, 10, // _NORON
+	0x29, 0 | DELAY, 100, // _DISPON
+};
+
+void board_init(void) {
+    displayio_fourwire_obj_t* bus = &displays[0].fourwire_bus;
+    bus->base.type = &displayio_fourwire_type;
+    busio_spi_obj_t *internal_spi = &supervisor_flash_spi_bus;
+    common_hal_displayio_fourwire_construct(bus,
+        internal_spi,
+        &pin_PA08, // Command or data
+        &pin_PB12, // Chip select
+        &pin_PB10, // Reset
+        24000000);
+
+    displayio_display_obj_t* display = &displays[0].display;
+    display->base.type = &displayio_display_type;
+    common_hal_displayio_display_construct(display,
+        bus,
+        160, // Width
+        128, // Height
+        0, // column start
+        0, // row start
+        90, // rotation
+        16, // Color depth
+        false, // Grayscale
+        false, // Pixels in a byte share a row. Only used for depth < 8
+        1, // bytes per cell. Only valid for depths < 8
+        false, // reverse_pixels_in_byte. Only valid for depths < 8
+        MIPI_COMMAND_SET_COLUMN_ADDRESS, // Set column command
+        MIPI_COMMAND_SET_PAGE_ADDRESS, // Set row command
+        MIPI_COMMAND_WRITE_MEMORY_START, // Write memory command
+        0x37, // set vertical scroll command
+        display_init_sequence,
+        sizeof(display_init_sequence),
+        &pin_PB03,
+        NO_BRIGHTNESS_COMMAND,
+        1.0f, // brightness (ignored)
+        true, // auto_brightness
+        false, // single_byte_bounds
+        false, // data_as_commands
+        true, // auto_refresh
+        60); // native_frames_per_second
+}
+
+bool board_requests_safe_mode(void) {
+    return false;
+}
+
+void reset_board(void) {
+
+}
diff --git a/ports/stm/boards/meowbit_v121/mpconfigboard.h b/ports/stm/boards/meowbit_v121/mpconfigboard.h
new file mode 100644
index 000000000..babf54a3a
--- /dev/null
+++ b/ports/stm/boards/meowbit_v121/mpconfigboard.h
@@ -0,0 +1,47 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+//Micropython setup
+
+#define MICROPY_HW_BOARD_NAME       "MEOWBIT"
+#define MICROPY_HW_MCU_NAME         "STM32F401xE"
+
+#define FLASH_SIZE                  (0x80000)
+#define FLASH_PAGE_SIZE             (0x4000)
+
+#define AUTORESET_DELAY_MS 500
+#define BOARD_FLASH_SIZE (FLASH_SIZE - 0x4000)
+
+#define BOARD_OSC_DIV (12)
+#define BOARD_NO_VBUS_SENSE (1)
+#define BOARD_VTOR_DEFER (1) //Leave VTOR relocation to bootloader
+#define BOARD_USE_INTERNAL_SPI
+
+// On-board flash
+#define SPI_FLASH_MOSI_PIN          (&pin_PB15)
+#define SPI_FLASH_MISO_PIN          (&pin_PB14)
+#define SPI_FLASH_SCK_PIN           (&pin_PB13)
+#define SPI_FLASH_CS_PIN            (&pin_PB01)
diff --git a/ports/stm/boards/meowbit_v121/mpconfigboard.mk b/ports/stm/boards/meowbit_v121/mpconfigboard.mk
new file mode 100644
index 000000000..16268ba11
--- /dev/null
+++ b/ports/stm/boards/meowbit_v121/mpconfigboard.mk
@@ -0,0 +1,24 @@
+USB_VID = 0x239A
+USB_PID = 0x805A
+USB_PRODUCT = "Meowbit"
+USB_MANUFACTURER = "Kittenbot"
+USB_DEVICES = "CDC,MSC"
+
+SPI_FLASH_FILESYSTEM = 1
+EXTERNAL_FLASH_DEVICE_COUNT = 1
+EXTERNAL_FLASH_DEVICES = W25Q16JV_IQ
+LONGINT_IMPL = MPZ
+
+BOOTLOADER_OFFSET = 0x8010000
+
+# INTERNAL_FLASH_FILESYSTEM = 1
+# LONGINT_IMPL = NONE
+
+MCU_SERIES = m4
+MCU_VARIANT = stm32f4
+MCU_SUB_VARIANT = stm32f401xe
+MCU_PACKAGE = 64
+CMSIS_MCU = STM32F401xE
+LD_FILE = boards/STM32F401xe_boot.ld 
+# LD_FILE = boards/STM32F401xe_fs.ld # use for internal flash
+
diff --git a/ports/stm/boards/meowbit_v121/pins.c b/ports/stm/boards/meowbit_v121/pins.c
new file mode 100644
index 000000000..af896fad8
--- /dev/null
+++ b/ports/stm/boards/meowbit_v121/pins.c
@@ -0,0 +1,68 @@
+#include "shared-bindings/board/__init__.h"
+#include "supervisor/spi_flash_api.h"
+
+#include "shared-module/displayio/__init__.h"
+
+STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_LED_RED), MP_ROM_PTR(&pin_PB04) },
+    { MP_ROM_QSTR(MP_QSTR_LED_GREEN), MP_ROM_PTR(&pin_PB05) },
+
+    { MP_ROM_QSTR(MP_QSTR_DISP_SCK), MP_ROM_PTR(&pin_PB13) },
+    { MP_ROM_QSTR(MP_QSTR_DISP_MISO), MP_ROM_PTR(&pin_PB14) },
+    { MP_ROM_QSTR(MP_QSTR_DISP_MOSI), MP_ROM_PTR(&pin_PB15) },
+    { MP_ROM_QSTR(MP_QSTR_DISP_CS), MP_ROM_PTR(&pin_PB12) },
+    { MP_ROM_QSTR(MP_QSTR_DISP_DC), MP_ROM_PTR(&pin_PA08) },
+    { MP_ROM_QSTR(MP_QSTR_DISP_RST), MP_ROM_PTR(&pin_PB10) },
+    { MP_ROM_QSTR(MP_QSTR_DISP_BL), MP_ROM_PTR(&pin_PB03) },
+
+    { MP_ROM_QSTR(MP_QSTR_BUZZ), MP_ROM_PTR(&pin_PB08) },
+    { MP_ROM_QSTR(MP_QSTR_BTNA), MP_ROM_PTR(&pin_PB09) },
+    { MP_ROM_QSTR(MP_QSTR_BTNB), MP_ROM_PTR(&pin_PC03) },
+    { MP_ROM_QSTR(MP_QSTR_RIGHT), MP_ROM_PTR(&pin_PB02) },
+    { MP_ROM_QSTR(MP_QSTR_DOWN), MP_ROM_PTR(&pin_PA05) },
+    { MP_ROM_QSTR(MP_QSTR_LEFT), MP_ROM_PTR(&pin_PA07) },
+    { MP_ROM_QSTR(MP_QSTR_TEMP), MP_ROM_PTR(&pin_PC05) },
+    { MP_ROM_QSTR(MP_QSTR_UP), MP_ROM_PTR(&pin_PA06) },
+    { MP_ROM_QSTR(MP_QSTR_LIGHT), MP_ROM_PTR(&pin_PC02) },
+    { MP_ROM_QSTR(MP_QSTR_MENU), MP_ROM_PTR(&pin_PC15) },
+
+    { MP_ROM_QSTR(MP_QSTR_JACK_TX), MP_ROM_PTR(&pin_PA09) },
+    { MP_ROM_QSTR(MP_QSTR_JACK_PWREN), MP_ROM_PTR(&pin_PA07) },
+    { MP_ROM_QSTR(MP_QSTR_JACK_SND), MP_ROM_PTR(&pin_PB08) },
+    { MP_ROM_QSTR(MP_QSTR_ACC_INT), MP_ROM_PTR(&pin_PC14) },
+    { MP_ROM_QSTR(MP_QSTR_ACC_SCL), MP_ROM_PTR(&pin_PB06) },
+    { MP_ROM_QSTR(MP_QSTR_ACC_SDA), MP_ROM_PTR(&pin_PB07) },
+
+    { MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_PB07) },
+    { MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_PB06) },
+    // { MP_ROM_QSTR(MP_QSTR_TX), MP_ROM_PTR(&pin_PC06) },  //these are wrong on Meowbit diagram.
+    // { MP_ROM_QSTR(MP_QSTR_RX), MP_ROM_PTR(&pin_PA03) },  //they cannot be used together (UART2 vs 6)
+    { MP_ROM_QSTR(MP_QSTR_NSS), MP_ROM_PTR(&pin_PA15) },
+    { MP_ROM_QSTR(MP_QSTR_MOSI), MP_ROM_PTR(&pin_PC12) },
+    { MP_ROM_QSTR(MP_QSTR_MISO), MP_ROM_PTR(&pin_PC11) },
+    { MP_ROM_QSTR(MP_QSTR_SCK), MP_ROM_PTR(&pin_PC10) },
+
+    { MP_ROM_QSTR(MP_QSTR_P20), MP_ROM_PTR(&pin_PB07) },
+    { MP_ROM_QSTR(MP_QSTR_P19), MP_ROM_PTR(&pin_PB06) },
+    { MP_ROM_QSTR(MP_QSTR_P16), MP_ROM_PTR(&pin_PA15) },
+    { MP_ROM_QSTR(MP_QSTR_P15), MP_ROM_PTR(&pin_PC12) },
+    { MP_ROM_QSTR(MP_QSTR_P14), MP_ROM_PTR(&pin_PC11) },
+    { MP_ROM_QSTR(MP_QSTR_P13), MP_ROM_PTR(&pin_PC10) },
+    { MP_ROM_QSTR(MP_QSTR_P2), MP_ROM_PTR(&pin_PA02) },
+    { MP_ROM_QSTR(MP_QSTR_P12), MP_ROM_PTR(&pin_PA03) },
+    { MP_ROM_QSTR(MP_QSTR_P11), MP_ROM_PTR(&pin_PB03) },
+    { MP_ROM_QSTR(MP_QSTR_P10), MP_ROM_PTR(&pin_PC00) },
+    { MP_ROM_QSTR(MP_QSTR_P9), MP_ROM_PTR(&pin_PC06) },
+    { MP_ROM_QSTR(MP_QSTR_P8), MP_ROM_PTR(&pin_PA04) },
+    { MP_ROM_QSTR(MP_QSTR_P1), MP_ROM_PTR(&pin_PA01) },
+    { MP_ROM_QSTR(MP_QSTR_P7), MP_ROM_PTR(&pin_PA10) }, //in use by USB
+    { MP_ROM_QSTR(MP_QSTR_P6), MP_ROM_PTR(&pin_PC07) },
+    { MP_ROM_QSTR(MP_QSTR_P5), MP_ROM_PTR(&pin_PB05) },
+    { MP_ROM_QSTR(MP_QSTR_P4), MP_ROM_PTR(&pin_PC01) },
+    { MP_ROM_QSTR(MP_QSTR_P0), MP_ROM_PTR(&pin_PA00) },
+    { MP_ROM_QSTR(MP_QSTR_P3), MP_ROM_PTR(&pin_PB00) },
+
+    { MP_ROM_QSTR(MP_QSTR_DISPLAY), MP_ROM_PTR(&displays[0].display)},
+    { MP_ROM_QSTR(MP_QSTR_INTERNAL_SPI), MP_ROM_PTR(&supervisor_flash_spi_bus) },
+};
+MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/stm/boards/meowbit_v121/stm32f4xx_hal_conf.h b/ports/stm/boards/meowbit_v121/stm32f4xx_hal_conf.h
new file mode 100644
index 000000000..68a49b4ba
--- /dev/null
+++ b/ports/stm/boards/meowbit_v121/stm32f4xx_hal_conf.h
@@ -0,0 +1,440 @@
+/**
+  ******************************************************************************
+  * @file    stm32f4xx_hal_conf_template.h
+  * @author  MCD Application Team
+  * @brief   HAL configuration template file. 
+  *          This file should be copied to the application folder and renamed
+  *          to stm32f4xx_hal_conf.h.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */ 
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __STM32F4xx_HAL_CONF_H
+#define __STM32F4xx_HAL_CONF_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+
+/* ########################## Module Selection ############################## */
+/**
+  * @brief This is the list of modules to be used in the HAL driver 
+  */
+#define HAL_MODULE_ENABLED  
+
+#define HAL_ADC_MODULE_ENABLED
+/* #define HAL_CRYP_MODULE_ENABLED   */
+/* #define HAL_CAN_MODULE_ENABLED   */
+/* #define HAL_CRC_MODULE_ENABLED   */
+/* #define HAL_CRYP_MODULE_ENABLED   */
+#define HAL_DAC_MODULE_ENABLED
+/* #define HAL_DCMI_MODULE_ENABLED   */
+/* #define HAL_DMA2D_MODULE_ENABLED   */
+/* #define HAL_ETH_MODULE_ENABLED   */
+/* #define HAL_NAND_MODULE_ENABLED   */
+/* #define HAL_NOR_MODULE_ENABLED   */
+/* #define HAL_PCCARD_MODULE_ENABLED   */
+/* #define HAL_SRAM_MODULE_ENABLED   */
+/* #define HAL_SDRAM_MODULE_ENABLED   */
+/* #define HAL_HASH_MODULE_ENABLED   */
+#define HAL_I2C_MODULE_ENABLED
+#define HAL_I2S_MODULE_ENABLED
+/* #define HAL_IWDG_MODULE_ENABLED   */
+/* #define HAL_LTDC_MODULE_ENABLED   */
+/* #define HAL_RNG_MODULE_ENABLED   */
+/* #define HAL_RTC_MODULE_ENABLED   */
+/* #define HAL_SAI_MODULE_ENABLED   */
+/* #define HAL_SD_MODULE_ENABLED   */
+/* #define HAL_MMC_MODULE_ENABLED   */
+#define HAL_SPI_MODULE_ENABLED
+#define HAL_TIM_MODULE_ENABLED
+#define HAL_UART_MODULE_ENABLED   
+#define HAL_USART_MODULE_ENABLED
+/* #define HAL_IRDA_MODULE_ENABLED   */
+/* #define HAL_SMARTCARD_MODULE_ENABLED   */
+/* #define HAL_WWDG_MODULE_ENABLED   */
+#define HAL_PCD_MODULE_ENABLED
+/* #define HAL_HCD_MODULE_ENABLED   */
+/* #define HAL_DSI_MODULE_ENABLED   */
+/* #define HAL_QSPI_MODULE_ENABLED   */
+/* #define HAL_QSPI_MODULE_ENABLED   */
+/* #define HAL_CEC_MODULE_ENABLED   */
+/* #define HAL_FMPI2C_MODULE_ENABLED   */
+/* #define HAL_SPDIFRX_MODULE_ENABLED   */
+/* #define HAL_DFSDM_MODULE_ENABLED   */
+/* #define HAL_LPTIM_MODULE_ENABLED   */
+/* #define HAL_EXTI_MODULE_ENABLED   */
+#define HAL_GPIO_MODULE_ENABLED
+#define HAL_EXTI_MODULE_ENABLED
+#define HAL_DMA_MODULE_ENABLED
+#define HAL_RCC_MODULE_ENABLED
+#define HAL_FLASH_MODULE_ENABLED
+#define HAL_PWR_MODULE_ENABLED
+#define HAL_CORTEX_MODULE_ENABLED
+
+/* ########################## HSE/HSI Values adaptation ##################### */
+/**
+  * @brief Adjust the value of External High Speed oscillator (HSE) used in your application.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSE is used as system clock source, directly or through the PLL).  
+  */
+#if !defined  (HSE_VALUE) 
+  #define HSE_VALUE    ((uint32_t)12000000) /*!< Value of the External oscillator in Hz */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSE_STARTUP_TIMEOUT)
+  #define HSE_STARTUP_TIMEOUT    ((uint32_t)100U)   /*!< Time out for HSE start up, in ms */
+#endif /* HSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief Internal High Speed oscillator (HSI) value.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSI is used as system clock source, directly or through the PLL). 
+  */
+#if !defined  (HSI_VALUE)
+  #define HSI_VALUE    ((uint32_t)16000000) /*!< Value of the Internal oscillator in Hz*/
+#endif /* HSI_VALUE */
+
+/**
+  * @brief Internal Low Speed oscillator (LSI) value.
+  */
+#if !defined  (LSI_VALUE) 
+ #define LSI_VALUE  ((uint32_t)40000)    
+#endif /* LSI_VALUE */                      /*!< Value of the Internal Low Speed oscillator in Hz
+                                             The real value may vary depending on the variations
+                                             in voltage and temperature.  */
+/**
+  * @brief External Low Speed oscillator (LSE) value.
+  */
+#if !defined  (LSE_VALUE)
+ #define LSE_VALUE  ((uint32_t)32768)    /*!< Value of the External Low Speed oscillator in Hz */
+#endif /* LSE_VALUE */
+
+#if !defined  (LSE_STARTUP_TIMEOUT)
+  #define LSE_STARTUP_TIMEOUT    ((uint32_t)5000U)   /*!< Time out for LSE start up, in ms */
+#endif /* LSE_STARTUP_TIMEOUT */
+
+
+/**
+  * @brief External clock source for I2S peripheral
+  *        This value is used by the I2S HAL module to compute the I2S clock source 
+  *        frequency, this source is inserted directly through I2S_CKIN pad. 
+  */
+#if !defined  (EXTERNAL_CLOCK_VALUE)
+  #define EXTERNAL_CLOCK_VALUE    ((uint32_t)12288000U) /*!< Value of the External audio frequency in Hz*/
+#endif /* EXTERNAL_CLOCK_VALUE */
+
+/* Tip: To avoid modifying this file each time you need to use different HSE,
+   ===  you can define the HSE value in your toolchain compiler preprocessor. */
+
+/* ########################### System Configuration ######################### */
+/**
+  * @brief This is the HAL system configuration section
+  */
+#define  VDD_VALUE          ((uint32_t)3300U) /*!< Value of VDD in mv */           
+#define  TICK_INT_PRIORITY            ((uint32_t)0U)   /*!< tick interrupt priority */            
+#define  USE_RTOS                     0U     
+#define  PREFETCH_ENABLE              1U
+#define  INSTRUCTION_CACHE_ENABLE     1U
+#define  DATA_CACHE_ENABLE            1U
+
+/* ########################## Assert Selection ############################## */
+/**
+  * @brief Uncomment the line below to expanse the "assert_param" macro in the 
+  *        HAL drivers code
+  */
+/* #define USE_FULL_ASSERT    1U */
+
+/* ################## Ethernet peripheral configuration ##################### */
+
+/* Section 1 : Ethernet peripheral configuration */
+
+/* MAC ADDRESS: MAC_ADDR0:MAC_ADDR1:MAC_ADDR2:MAC_ADDR3:MAC_ADDR4:MAC_ADDR5 */
+#define MAC_ADDR0   2U
+#define MAC_ADDR1   0U
+#define MAC_ADDR2   0U
+#define MAC_ADDR3   0U
+#define MAC_ADDR4   0U
+#define MAC_ADDR5   0U
+
+/* Definition of the Ethernet driver buffers size and count */   
+#define ETH_RX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for receive               */
+#define ETH_TX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for transmit              */
+#define ETH_RXBUFNB                    ((uint32_t)4U)       /* 4 Rx buffers of size ETH_RX_BUF_SIZE  */
+#define ETH_TXBUFNB                    ((uint32_t)4U)       /* 4 Tx buffers of size ETH_TX_BUF_SIZE  */
+
+/* Section 2: PHY configuration section */
+
+/* DP83848_PHY_ADDRESS Address*/ 
+#define DP83848_PHY_ADDRESS           0x01U
+/* PHY Reset delay these values are based on a 1 ms Systick interrupt*/ 
+#define PHY_RESET_DELAY                 ((uint32_t)0x000000FFU)
+/* PHY Configuration delay */
+#define PHY_CONFIG_DELAY                ((uint32_t)0x00000FFFU)
+
+#define PHY_READ_TO                     ((uint32_t)0x0000FFFFU)
+#define PHY_WRITE_TO                    ((uint32_t)0x0000FFFFU)
+
+/* Section 3: Common PHY Registers */
+
+#define PHY_BCR                         ((uint16_t)0x0000U)    /*!< Transceiver Basic Control Register   */
+#define PHY_BSR                         ((uint16_t)0x0001U)    /*!< Transceiver Basic Status Register    */
+ 
+#define PHY_RESET                       ((uint16_t)0x8000U)  /*!< PHY Reset */
+#define PHY_LOOPBACK                    ((uint16_t)0x4000U)  /*!< Select loop-back mode */
+#define PHY_FULLDUPLEX_100M             ((uint16_t)0x2100U)  /*!< Set the full-duplex mode at 100 Mb/s */
+#define PHY_HALFDUPLEX_100M             ((uint16_t)0x2000U)  /*!< Set the half-duplex mode at 100 Mb/s */
+#define PHY_FULLDUPLEX_10M              ((uint16_t)0x0100U)  /*!< Set the full-duplex mode at 10 Mb/s  */
+#define PHY_HALFDUPLEX_10M              ((uint16_t)0x0000U)  /*!< Set the half-duplex mode at 10 Mb/s  */
+#define PHY_AUTONEGOTIATION             ((uint16_t)0x1000U)  /*!< Enable auto-negotiation function     */
+#define PHY_RESTART_AUTONEGOTIATION     ((uint16_t)0x0200U)  /*!< Restart auto-negotiation function    */
+#define PHY_POWERDOWN                   ((uint16_t)0x0800U)  /*!< Select the power down mode           */
+#define PHY_ISOLATE                     ((uint16_t)0x0400U)  /*!< Isolate PHY from MII                 */
+
+#define PHY_AUTONEGO_COMPLETE           ((uint16_t)0x0020U)  /*!< Auto-Negotiation process completed   */
+#define PHY_LINKED_STATUS               ((uint16_t)0x0004U)  /*!< Valid link established               */
+#define PHY_JABBER_DETECTION            ((uint16_t)0x0002U)  /*!< Jabber condition detected            */
+  
+/* Section 4: Extended PHY Registers */
+#define PHY_SR                          ((uint16_t)0x10U)    /*!< PHY status register Offset                      */
+
+#define PHY_SPEED_STATUS                ((uint16_t)0x0002U)  /*!< PHY Speed mask                                  */
+#define PHY_DUPLEX_STATUS               ((uint16_t)0x0004U)  /*!< PHY Duplex mask                                 */
+
+/* ################## SPI peripheral configuration ########################## */
+
+/* CRC FEATURE: Use to activate CRC feature inside HAL SPI Driver
+* Activated: CRC code is present inside driver
+* Deactivated: CRC code cleaned from driver
+*/
+
+#define USE_SPI_CRC                     0U
+
+/* Includes ------------------------------------------------------------------*/
+/**
+  * @brief Include module's header file 
+  */
+
+#ifdef HAL_RCC_MODULE_ENABLED
+  #include "stm32f4xx_hal_rcc.h"
+#endif /* HAL_RCC_MODULE_ENABLED */
+
+#ifdef HAL_EXTI_MODULE_ENABLED
+  #include "stm32f4xx_hal_exti.h"
+#endif /* HAL_EXTI_MODULE_ENABLED */
+
+#ifdef HAL_GPIO_MODULE_ENABLED
+  #include "stm32f4xx_hal_gpio.h"
+#endif /* HAL_GPIO_MODULE_ENABLED */
+
+#ifdef HAL_DMA_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma.h"
+#endif /* HAL_DMA_MODULE_ENABLED */
+   
+#ifdef HAL_CORTEX_MODULE_ENABLED
+  #include "stm32f4xx_hal_cortex.h"
+#endif /* HAL_CORTEX_MODULE_ENABLED */
+
+#ifdef HAL_ADC_MODULE_ENABLED
+  #include "stm32f4xx_hal_adc.h"
+#endif /* HAL_ADC_MODULE_ENABLED */
+
+#ifdef HAL_CAN_MODULE_ENABLED
+  #include "stm32f4xx_hal_can.h"
+#endif /* HAL_CAN_MODULE_ENABLED */
+
+#ifdef HAL_CRC_MODULE_ENABLED
+  #include "stm32f4xx_hal_crc.h"
+#endif /* HAL_CRC_MODULE_ENABLED */
+
+#ifdef HAL_CRYP_MODULE_ENABLED
+  #include "stm32f4xx_hal_cryp.h" 
+#endif /* HAL_CRYP_MODULE_ENABLED */
+
+#ifdef HAL_DMA2D_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma2d.h"
+#endif /* HAL_DMA2D_MODULE_ENABLED */
+
+#ifdef HAL_DAC_MODULE_ENABLED
+  #include "stm32f4xx_hal_dac.h"
+#endif /* HAL_DAC_MODULE_ENABLED */
+
+#ifdef HAL_DCMI_MODULE_ENABLED
+  #include "stm32f4xx_hal_dcmi.h"
+#endif /* HAL_DCMI_MODULE_ENABLED */
+
+#ifdef HAL_ETH_MODULE_ENABLED
+  #include "stm32f4xx_hal_eth.h"
+#endif /* HAL_ETH_MODULE_ENABLED */
+
+#ifdef HAL_FLASH_MODULE_ENABLED
+  #include "stm32f4xx_hal_flash.h"
+#endif /* HAL_FLASH_MODULE_ENABLED */
+ 
+#ifdef HAL_SRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sram.h"
+#endif /* HAL_SRAM_MODULE_ENABLED */
+
+#ifdef HAL_NOR_MODULE_ENABLED
+  #include "stm32f4xx_hal_nor.h"
+#endif /* HAL_NOR_MODULE_ENABLED */
+
+#ifdef HAL_NAND_MODULE_ENABLED
+  #include "stm32f4xx_hal_nand.h"
+#endif /* HAL_NAND_MODULE_ENABLED */
+
+#ifdef HAL_PCCARD_MODULE_ENABLED
+  #include "stm32f4xx_hal_pccard.h"
+#endif /* HAL_PCCARD_MODULE_ENABLED */ 
+  
+#ifdef HAL_SDRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sdram.h"
+#endif /* HAL_SDRAM_MODULE_ENABLED */      
+
+#ifdef HAL_HASH_MODULE_ENABLED
+ #include "stm32f4xx_hal_hash.h"
+#endif /* HAL_HASH_MODULE_ENABLED */
+
+#ifdef HAL_I2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2c.h"
+#endif /* HAL_I2C_MODULE_ENABLED */
+
+#ifdef HAL_I2S_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2s.h"
+#endif /* HAL_I2S_MODULE_ENABLED */
+
+#ifdef HAL_IWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_iwdg.h"
+#endif /* HAL_IWDG_MODULE_ENABLED */
+
+#ifdef HAL_LTDC_MODULE_ENABLED
+ #include "stm32f4xx_hal_ltdc.h"
+#endif /* HAL_LTDC_MODULE_ENABLED */
+
+#ifdef HAL_PWR_MODULE_ENABLED
+ #include "stm32f4xx_hal_pwr.h"
+#endif /* HAL_PWR_MODULE_ENABLED */
+
+#ifdef HAL_RNG_MODULE_ENABLED
+ #include "stm32f4xx_hal_rng.h"
+#endif /* HAL_RNG_MODULE_ENABLED */
+
+#ifdef HAL_RTC_MODULE_ENABLED
+ #include "stm32f4xx_hal_rtc.h"
+#endif /* HAL_RTC_MODULE_ENABLED */
+
+#ifdef HAL_SAI_MODULE_ENABLED
+ #include "stm32f4xx_hal_sai.h"
+#endif /* HAL_SAI_MODULE_ENABLED */
+
+#ifdef HAL_SD_MODULE_ENABLED
+ #include "stm32f4xx_hal_sd.h"
+#endif /* HAL_SD_MODULE_ENABLED */
+
+#ifdef HAL_MMC_MODULE_ENABLED
+ #include "stm32f4xx_hal_mmc.h"
+#endif /* HAL_MMC_MODULE_ENABLED */
+
+#ifdef HAL_SPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_spi.h"
+#endif /* HAL_SPI_MODULE_ENABLED */
+
+#ifdef HAL_TIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_tim.h"
+#endif /* HAL_TIM_MODULE_ENABLED */
+
+#ifdef HAL_UART_MODULE_ENABLED
+ #include "stm32f4xx_hal_uart.h"
+#endif /* HAL_UART_MODULE_ENABLED */
+
+#ifdef HAL_USART_MODULE_ENABLED
+ #include "stm32f4xx_hal_usart.h"
+#endif /* HAL_USART_MODULE_ENABLED */
+
+#ifdef HAL_IRDA_MODULE_ENABLED
+ #include "stm32f4xx_hal_irda.h"
+#endif /* HAL_IRDA_MODULE_ENABLED */
+
+#ifdef HAL_SMARTCARD_MODULE_ENABLED
+ #include "stm32f4xx_hal_smartcard.h"
+#endif /* HAL_SMARTCARD_MODULE_ENABLED */
+
+#ifdef HAL_WWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_wwdg.h"
+#endif /* HAL_WWDG_MODULE_ENABLED */
+
+#ifdef HAL_PCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_pcd.h"
+#endif /* HAL_PCD_MODULE_ENABLED */
+
+#ifdef HAL_HCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_hcd.h"
+#endif /* HAL_HCD_MODULE_ENABLED */
+   
+#ifdef HAL_DSI_MODULE_ENABLED
+ #include "stm32f4xx_hal_dsi.h"
+#endif /* HAL_DSI_MODULE_ENABLED */
+
+#ifdef HAL_QSPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_qspi.h"
+#endif /* HAL_QSPI_MODULE_ENABLED */
+
+#ifdef HAL_CEC_MODULE_ENABLED
+ #include "stm32f4xx_hal_cec.h"
+#endif /* HAL_CEC_MODULE_ENABLED */
+
+#ifdef HAL_FMPI2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_fmpi2c.h"
+#endif /* HAL_FMPI2C_MODULE_ENABLED */
+
+#ifdef HAL_SPDIFRX_MODULE_ENABLED
+ #include "stm32f4xx_hal_spdifrx.h"
+#endif /* HAL_SPDIFRX_MODULE_ENABLED */
+
+#ifdef HAL_DFSDM_MODULE_ENABLED
+ #include "stm32f4xx_hal_dfsdm.h"
+#endif /* HAL_DFSDM_MODULE_ENABLED */
+
+#ifdef HAL_LPTIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_lptim.h"
+#endif /* HAL_LPTIM_MODULE_ENABLED */
+   
+/* Exported macro ------------------------------------------------------------*/
+#ifdef  USE_FULL_ASSERT
+/**
+  * @brief  The assert_param macro is used for function's parameters check.
+  * @param  expr: If expr is false, it calls assert_failed function
+  *         which reports the name of the source file and the source
+  *         line number of the call that failed. 
+  *         If expr is true, it returns no value.
+  * @retval None
+  */
+  #define assert_param(expr) ((expr) ? (void)0U : assert_failed((uint8_t *)__FILE__, __LINE__))
+/* Exported functions ------------------------------------------------------- */
+  void assert_failed(uint8_t* file, uint32_t line);
+#else
+  #define assert_param(expr) ((void)0U)
+#endif /* USE_FULL_ASSERT */    
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __STM32F4xx_HAL_CONF_H */
+ 
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/ports/stm/boards/openocd_stm32f4.cfg b/ports/stm/boards/openocd_stm32f4.cfg
new file mode 100644
index 000000000..19631a7c8
--- /dev/null
+++ b/ports/stm/boards/openocd_stm32f4.cfg
@@ -0,0 +1,44 @@
+# This script configures OpenOCD for use with an ST-Link V2 programmer/debugger
+# and an STM32F4 target microcontroller.
+#
+# To flash your firmware:
+#
+#    $ openocd -f openocd_stm32f4.cfg \
+#        -c "stm_flash build-BOARD/firmware0.bin 0x08000000 build-BOARD/firmware1.bin 0x08020000"
+#
+# For a gdb server on port 3333:
+#
+#    $ openocd -f openocd_stm32f4.cfg
+
+
+source [find interface/stlink-v2.cfg]
+transport select hla_swd
+source [find target/stm32f4x.cfg]
+reset_config srst_only
+init
+
+proc stm_flash { BIN0 ADDR0 {BIN1 ""} {ADDR1 ""} } {
+    reset halt
+    sleep 100
+    wait_halt 2
+    flash write_image erase $BIN0 $ADDR0
+    sleep 100
+    verify_image $BIN0 $ADDR0
+    sleep 100
+    if {$BIN1 ne ""} {
+        flash write_image erase $BIN1 $ADDR1
+        sleep 100
+        verify_image $BIN1 $ADDR1
+        sleep 100
+    }
+    reset run
+    shutdown
+}
+
+proc stm_erase {} {
+    reset halt
+    sleep 100
+    stm32f4x mass_erase 0
+    sleep 100
+    shutdown
+}
diff --git a/ports/stm/boards/pyb_nano_v2/board.c b/ports/stm/boards/pyb_nano_v2/board.c
new file mode 100644
index 000000000..82b0c506e
--- /dev/null
+++ b/ports/stm/boards/pyb_nano_v2/board.c
@@ -0,0 +1,39 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "boards/board.h"
+#include "mpconfigboard.h"
+
+void board_init(void) {
+}
+
+bool board_requests_safe_mode(void) {
+    return false;
+}
+
+void reset_board(void) {
+
+}
diff --git a/ports/stm/boards/pyb_nano_v2/mpconfigboard.h b/ports/stm/boards/pyb_nano_v2/mpconfigboard.h
new file mode 100644
index 000000000..965e7d5ff
--- /dev/null
+++ b/ports/stm/boards/pyb_nano_v2/mpconfigboard.h
@@ -0,0 +1,47 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+//Micropython setup
+
+#define MICROPY_HW_BOARD_NAME       "PYB LR Nano V2"
+#define MICROPY_HW_MCU_NAME         "STM32F411CE"
+
+#define FLASH_SIZE                  (0x80000)
+#define FLASH_PAGE_SIZE             (0x4000)
+
+#define BOARD_OSC_DIV (8)
+
+// On-board flash
+#define SPI_FLASH_MOSI_PIN          (&pin_PB15)
+#define SPI_FLASH_MISO_PIN          (&pin_PB14)
+#define SPI_FLASH_SCK_PIN           (&pin_PB13)
+#define SPI_FLASH_CS_PIN            (&pin_PB12)
+
+#define CIRCUITPY_AUTORELOAD_DELAY_MS (500)
+
+#define BOARD_FLASH_SIZE (FLASH_SIZE - 0x2000 - 0xC000)
+
+#define AUTORESET_DELAY_MS (500)
diff --git a/ports/stm/boards/pyb_nano_v2/mpconfigboard.mk b/ports/stm/boards/pyb_nano_v2/mpconfigboard.mk
new file mode 100644
index 000000000..a8472608b
--- /dev/null
+++ b/ports/stm/boards/pyb_nano_v2/mpconfigboard.mk
@@ -0,0 +1,18 @@
+USB_VID = 0x239A
+USB_PID = 0x8068
+USB_PRODUCT = "PYB LR Nano V2"
+USB_MANUFACTURER = "MicroPython Chinese Community"
+USB_DEVICES = "CDC,MSC"
+
+SPI_FLASH_FILESYSTEM = 1
+EXTERNAL_FLASH_DEVICE_COUNT = 1
+EXTERNAL_FLASH_DEVICES = W25Q64JV_IQ
+LONGINT_IMPL = MPZ
+
+MCU_SERIES = m4
+MCU_VARIANT = stm32f4
+MCU_SUB_VARIANT = stm32f411xe
+MCU_PACKAGE = 48
+CMSIS_MCU = STM32F411xE
+LD_FILE = boards/STM32F411VETx_FLASH.ld
+
diff --git a/ports/stm/boards/pyb_nano_v2/pins.c b/ports/stm/boards/pyb_nano_v2/pins.c
new file mode 100644
index 000000000..e10124f6a
--- /dev/null
+++ b/ports/stm/boards/pyb_nano_v2/pins.c
@@ -0,0 +1,59 @@
+#include "shared-bindings/board/__init__.h"
+
+STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_Y10), MP_ROM_PTR(&pin_PA10) },
+    { MP_ROM_QSTR(MP_QSTR_Y9), MP_ROM_PTR(&pin_PA13) },
+    { MP_ROM_QSTR(MP_QSTR_Y8), MP_ROM_PTR(&pin_PA14) },
+    { MP_ROM_QSTR(MP_QSTR_Y7), MP_ROM_PTR(&pin_PA15) },
+    { MP_ROM_QSTR(MP_QSTR_Y6), MP_ROM_PTR(&pin_PB03) },
+    { MP_ROM_QSTR(MP_QSTR_Y5), MP_ROM_PTR(&pin_PB04) },
+    { MP_ROM_QSTR(MP_QSTR_Y4), MP_ROM_PTR(&pin_PB05) },
+    { MP_ROM_QSTR(MP_QSTR_Y3), MP_ROM_PTR(&pin_PB06) },
+    { MP_ROM_QSTR(MP_QSTR_Y2), MP_ROM_PTR(&pin_PB07) },
+    { MP_ROM_QSTR(MP_QSTR_Y1), MP_ROM_PTR(&pin_PB08) },
+    { MP_ROM_QSTR(MP_QSTR_Y0), MP_ROM_PTR(&pin_PB09) },
+
+    { MP_ROM_QSTR(MP_QSTR_X15), MP_ROM_PTR(&pin_PA08) },
+    { MP_ROM_QSTR(MP_QSTR_X14), MP_ROM_PTR(&pin_PB15) },
+    { MP_ROM_QSTR(MP_QSTR_X13), MP_ROM_PTR(&pin_PB14) },
+    { MP_ROM_QSTR(MP_QSTR_X12), MP_ROM_PTR(&pin_PB13) },
+    { MP_ROM_QSTR(MP_QSTR_X11), MP_ROM_PTR(&pin_PB12) },
+    { MP_ROM_QSTR(MP_QSTR_X10), MP_ROM_PTR(&pin_PB10) },
+    { MP_ROM_QSTR(MP_QSTR_X9), MP_ROM_PTR(&pin_PB01) },
+    { MP_ROM_QSTR(MP_QSTR_X8), MP_ROM_PTR(&pin_PB00) },
+    { MP_ROM_QSTR(MP_QSTR_X7), MP_ROM_PTR(&pin_PA07) },
+    { MP_ROM_QSTR(MP_QSTR_X6), MP_ROM_PTR(&pin_PA06) },
+    { MP_ROM_QSTR(MP_QSTR_X5), MP_ROM_PTR(&pin_PA05) },
+    { MP_ROM_QSTR(MP_QSTR_X4), MP_ROM_PTR(&pin_PA04) },
+    { MP_ROM_QSTR(MP_QSTR_X3), MP_ROM_PTR(&pin_PA03) },
+    { MP_ROM_QSTR(MP_QSTR_X2), MP_ROM_PTR(&pin_PA02) },
+    { MP_ROM_QSTR(MP_QSTR_X1), MP_ROM_PTR(&pin_PA01) },
+    { MP_ROM_QSTR(MP_QSTR_X0), MP_ROM_PTR(&pin_PA00) },
+
+    { MP_ROM_QSTR(MP_QSTR_SDA1), MP_ROM_PTR(&pin_PB09) },
+    { MP_ROM_QSTR(MP_QSTR_SCL1), MP_ROM_PTR(&pin_PB08) },
+    { MP_ROM_QSTR(MP_QSTR_SDA2), MP_ROM_PTR(&pin_PB03) },
+    { MP_ROM_QSTR(MP_QSTR_SCL2), MP_ROM_PTR(&pin_PB10) },
+    { MP_ROM_QSTR(MP_QSTR_SDA3), MP_ROM_PTR(&pin_PB04) },
+    { MP_ROM_QSTR(MP_QSTR_SCL3), MP_ROM_PTR(&pin_PA08) },
+
+    { MP_ROM_QSTR(MP_QSTR_SCK1), MP_ROM_PTR(&pin_PA05) },
+    { MP_ROM_QSTR(MP_QSTR_MISO1), MP_ROM_PTR(&pin_PA06) },
+    { MP_ROM_QSTR(MP_QSTR_MOSI1), MP_ROM_PTR(&pin_PA07) },
+    { MP_ROM_QSTR(MP_QSTR_SCK2), MP_ROM_PTR(&pin_PB13) },
+    { MP_ROM_QSTR(MP_QSTR_MISO2), MP_ROM_PTR(&pin_PB14) },
+    { MP_ROM_QSTR(MP_QSTR_MOSI2), MP_ROM_PTR(&pin_PB15) },
+
+    { MP_ROM_QSTR(MP_QSTR_TX1), MP_ROM_PTR(&pin_PB07) },
+    { MP_ROM_QSTR(MP_QSTR_RX1), MP_ROM_PTR(&pin_PB06) },
+    { MP_ROM_QSTR(MP_QSTR_TX2), MP_ROM_PTR(&pin_PA02) },
+    { MP_ROM_QSTR(MP_QSTR_RX2), MP_ROM_PTR(&pin_PA03) },
+
+    { MP_ROM_QSTR(MP_QSTR_LED_RED), MP_ROM_PTR(&pin_PA00) },
+    { MP_ROM_QSTR(MP_QSTR_LED_GREEN), MP_ROM_PTR(&pin_PA01) },
+    { MP_ROM_QSTR(MP_QSTR_LED_YELLOW), MP_ROM_PTR(&pin_PA02) },
+    { MP_ROM_QSTR(MP_QSTR_LED_BLUE), MP_ROM_PTR(&pin_PA03) },
+
+    { MP_ROM_QSTR(MP_QSTR_SW), MP_ROM_PTR(&pin_PC13) },
+};
+MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/stm/boards/pyb_nano_v2/stm32f4xx_hal_conf.h b/ports/stm/boards/pyb_nano_v2/stm32f4xx_hal_conf.h
new file mode 100644
index 000000000..ab04df318
--- /dev/null
+++ b/ports/stm/boards/pyb_nano_v2/stm32f4xx_hal_conf.h
@@ -0,0 +1,440 @@
+/**
+  ******************************************************************************
+  * @file    stm32f4xx_hal_conf_template.h
+  * @author  MCD Application Team
+  * @brief   HAL configuration template file. 
+  *          This file should be copied to the application folder and renamed
+  *          to stm32f4xx_hal_conf.h.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */ 
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __STM32F4xx_HAL_CONF_H
+#define __STM32F4xx_HAL_CONF_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+
+/* ########################## Module Selection ############################## */
+/**
+  * @brief This is the list of modules to be used in the HAL driver 
+  */
+#define HAL_MODULE_ENABLED  
+
+#define HAL_ADC_MODULE_ENABLED
+/* #define HAL_CRYP_MODULE_ENABLED   */
+/* #define HAL_CAN_MODULE_ENABLED   */
+/* #define HAL_CRC_MODULE_ENABLED   */
+/* #define HAL_CRYP_MODULE_ENABLED   */
+#define HAL_DAC_MODULE_ENABLED
+/* #define HAL_DCMI_MODULE_ENABLED   */
+/* #define HAL_DMA2D_MODULE_ENABLED   */
+/* #define HAL_ETH_MODULE_ENABLED   */
+/* #define HAL_NAND_MODULE_ENABLED   */
+/* #define HAL_NOR_MODULE_ENABLED   */
+/* #define HAL_PCCARD_MODULE_ENABLED   */
+/* #define HAL_SRAM_MODULE_ENABLED   */
+/* #define HAL_SDRAM_MODULE_ENABLED   */
+/* #define HAL_HASH_MODULE_ENABLED   */
+#define HAL_I2C_MODULE_ENABLED
+#define HAL_I2S_MODULE_ENABLED
+/* #define HAL_IWDG_MODULE_ENABLED   */
+/* #define HAL_LTDC_MODULE_ENABLED   */
+/* #define HAL_RNG_MODULE_ENABLED   */
+/* #define HAL_RTC_MODULE_ENABLED   */
+/* #define HAL_SAI_MODULE_ENABLED   */
+/* #define HAL_SD_MODULE_ENABLED   */
+/* #define HAL_MMC_MODULE_ENABLED   */
+#define HAL_SPI_MODULE_ENABLED
+#define HAL_TIM_MODULE_ENABLED
+#define HAL_UART_MODULE_ENABLED   
+#define HAL_USART_MODULE_ENABLED
+/* #define HAL_IRDA_MODULE_ENABLED   */
+/* #define HAL_SMARTCARD_MODULE_ENABLED   */
+/* #define HAL_WWDG_MODULE_ENABLED   */
+#define HAL_PCD_MODULE_ENABLED
+/* #define HAL_HCD_MODULE_ENABLED   */
+/* #define HAL_DSI_MODULE_ENABLED   */
+/* #define HAL_QSPI_MODULE_ENABLED   */
+/* #define HAL_QSPI_MODULE_ENABLED   */
+/* #define HAL_CEC_MODULE_ENABLED   */
+/* #define HAL_FMPI2C_MODULE_ENABLED   */
+/* #define HAL_SPDIFRX_MODULE_ENABLED   */
+/* #define HAL_DFSDM_MODULE_ENABLED   */
+/* #define HAL_LPTIM_MODULE_ENABLED   */
+/* #define HAL_EXTI_MODULE_ENABLED   */
+#define HAL_GPIO_MODULE_ENABLED
+#define HAL_EXTI_MODULE_ENABLED
+#define HAL_DMA_MODULE_ENABLED
+#define HAL_RCC_MODULE_ENABLED
+#define HAL_FLASH_MODULE_ENABLED
+#define HAL_PWR_MODULE_ENABLED
+#define HAL_CORTEX_MODULE_ENABLED
+
+/* ########################## HSE/HSI Values adaptation ##################### */
+/**
+  * @brief Adjust the value of External High Speed oscillator (HSE) used in your application.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSE is used as system clock source, directly or through the PLL).  
+  */
+#if !defined  (HSE_VALUE) 
+  #define HSE_VALUE    ((uint32_t)8000000) /*!< Value of the External oscillator in Hz */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSE_STARTUP_TIMEOUT)
+  #define HSE_STARTUP_TIMEOUT    ((uint32_t)100U)   /*!< Time out for HSE start up, in ms */
+#endif /* HSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief Internal High Speed oscillator (HSI) value.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSI is used as system clock source, directly or through the PLL). 
+  */
+#if !defined  (HSI_VALUE)
+  #define HSI_VALUE    ((uint32_t)16000000) /*!< Value of the Internal oscillator in Hz*/
+#endif /* HSI_VALUE */
+
+/**
+  * @brief Internal Low Speed oscillator (LSI) value.
+  */
+#if !defined  (LSI_VALUE) 
+ #define LSI_VALUE  ((uint32_t)40000)    
+#endif /* LSI_VALUE */                      /*!< Value of the Internal Low Speed oscillator in Hz
+                                             The real value may vary depending on the variations
+                                             in voltage and temperature.  */
+/**
+  * @brief External Low Speed oscillator (LSE) value.
+  */
+#if !defined  (LSE_VALUE)
+ #define LSE_VALUE  ((uint32_t)32768)    /*!< Value of the External Low Speed oscillator in Hz */
+#endif /* LSE_VALUE */
+
+#if !defined  (LSE_STARTUP_TIMEOUT)
+  #define LSE_STARTUP_TIMEOUT    ((uint32_t)5000U)   /*!< Time out for LSE start up, in ms */
+#endif /* LSE_STARTUP_TIMEOUT */
+
+
+/**
+  * @brief External clock source for I2S peripheral
+  *        This value is used by the I2S HAL module to compute the I2S clock source 
+  *        frequency, this source is inserted directly through I2S_CKIN pad. 
+  */
+#if !defined  (EXTERNAL_CLOCK_VALUE)
+  #define EXTERNAL_CLOCK_VALUE    ((uint32_t)12288000U) /*!< Value of the External audio frequency in Hz*/
+#endif /* EXTERNAL_CLOCK_VALUE */
+
+/* Tip: To avoid modifying this file each time you need to use different HSE,
+   ===  you can define the HSE value in your toolchain compiler preprocessor. */
+
+/* ########################### System Configuration ######################### */
+/**
+  * @brief This is the HAL system configuration section
+  */
+#define  VDD_VALUE          ((uint32_t)3300U) /*!< Value of VDD in mv */           
+#define  TICK_INT_PRIORITY            ((uint32_t)0U)   /*!< tick interrupt priority */            
+#define  USE_RTOS                     0U     
+#define  PREFETCH_ENABLE              1U
+#define  INSTRUCTION_CACHE_ENABLE     1U
+#define  DATA_CACHE_ENABLE            1U
+
+/* ########################## Assert Selection ############################## */
+/**
+  * @brief Uncomment the line below to expanse the "assert_param" macro in the 
+  *        HAL drivers code
+  */
+/* #define USE_FULL_ASSERT    1U */
+
+/* ################## Ethernet peripheral configuration ##################### */
+
+/* Section 1 : Ethernet peripheral configuration */
+
+/* MAC ADDRESS: MAC_ADDR0:MAC_ADDR1:MAC_ADDR2:MAC_ADDR3:MAC_ADDR4:MAC_ADDR5 */
+#define MAC_ADDR0   2U
+#define MAC_ADDR1   0U
+#define MAC_ADDR2   0U
+#define MAC_ADDR3   0U
+#define MAC_ADDR4   0U
+#define MAC_ADDR5   0U
+
+/* Definition of the Ethernet driver buffers size and count */   
+#define ETH_RX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for receive               */
+#define ETH_TX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for transmit              */
+#define ETH_RXBUFNB                    ((uint32_t)4U)       /* 4 Rx buffers of size ETH_RX_BUF_SIZE  */
+#define ETH_TXBUFNB                    ((uint32_t)4U)       /* 4 Tx buffers of size ETH_TX_BUF_SIZE  */
+
+/* Section 2: PHY configuration section */
+
+/* DP83848_PHY_ADDRESS Address*/ 
+#define DP83848_PHY_ADDRESS           0x01U
+/* PHY Reset delay these values are based on a 1 ms Systick interrupt*/ 
+#define PHY_RESET_DELAY                 ((uint32_t)0x000000FFU)
+/* PHY Configuration delay */
+#define PHY_CONFIG_DELAY                ((uint32_t)0x00000FFFU)
+
+#define PHY_READ_TO                     ((uint32_t)0x0000FFFFU)
+#define PHY_WRITE_TO                    ((uint32_t)0x0000FFFFU)
+
+/* Section 3: Common PHY Registers */
+
+#define PHY_BCR                         ((uint16_t)0x0000U)    /*!< Transceiver Basic Control Register   */
+#define PHY_BSR                         ((uint16_t)0x0001U)    /*!< Transceiver Basic Status Register    */
+ 
+#define PHY_RESET                       ((uint16_t)0x8000U)  /*!< PHY Reset */
+#define PHY_LOOPBACK                    ((uint16_t)0x4000U)  /*!< Select loop-back mode */
+#define PHY_FULLDUPLEX_100M             ((uint16_t)0x2100U)  /*!< Set the full-duplex mode at 100 Mb/s */
+#define PHY_HALFDUPLEX_100M             ((uint16_t)0x2000U)  /*!< Set the half-duplex mode at 100 Mb/s */
+#define PHY_FULLDUPLEX_10M              ((uint16_t)0x0100U)  /*!< Set the full-duplex mode at 10 Mb/s  */
+#define PHY_HALFDUPLEX_10M              ((uint16_t)0x0000U)  /*!< Set the half-duplex mode at 10 Mb/s  */
+#define PHY_AUTONEGOTIATION             ((uint16_t)0x1000U)  /*!< Enable auto-negotiation function     */
+#define PHY_RESTART_AUTONEGOTIATION     ((uint16_t)0x0200U)  /*!< Restart auto-negotiation function    */
+#define PHY_POWERDOWN                   ((uint16_t)0x0800U)  /*!< Select the power down mode           */
+#define PHY_ISOLATE                     ((uint16_t)0x0400U)  /*!< Isolate PHY from MII                 */
+
+#define PHY_AUTONEGO_COMPLETE           ((uint16_t)0x0020U)  /*!< Auto-Negotiation process completed   */
+#define PHY_LINKED_STATUS               ((uint16_t)0x0004U)  /*!< Valid link established               */
+#define PHY_JABBER_DETECTION            ((uint16_t)0x0002U)  /*!< Jabber condition detected            */
+  
+/* Section 4: Extended PHY Registers */
+#define PHY_SR                          ((uint16_t)0x10U)    /*!< PHY status register Offset                      */
+
+#define PHY_SPEED_STATUS                ((uint16_t)0x0002U)  /*!< PHY Speed mask                                  */
+#define PHY_DUPLEX_STATUS               ((uint16_t)0x0004U)  /*!< PHY Duplex mask                                 */
+
+/* ################## SPI peripheral configuration ########################## */
+
+/* CRC FEATURE: Use to activate CRC feature inside HAL SPI Driver
+* Activated: CRC code is present inside driver
+* Deactivated: CRC code cleaned from driver
+*/
+
+#define USE_SPI_CRC                     0U
+
+/* Includes ------------------------------------------------------------------*/
+/**
+  * @brief Include module's header file 
+  */
+
+#ifdef HAL_RCC_MODULE_ENABLED
+  #include "stm32f4xx_hal_rcc.h"
+#endif /* HAL_RCC_MODULE_ENABLED */
+
+#ifdef HAL_EXTI_MODULE_ENABLED
+  #include "stm32f4xx_hal_exti.h"
+#endif /* HAL_EXTI_MODULE_ENABLED */
+
+#ifdef HAL_GPIO_MODULE_ENABLED
+  #include "stm32f4xx_hal_gpio.h"
+#endif /* HAL_GPIO_MODULE_ENABLED */
+
+#ifdef HAL_DMA_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma.h"
+#endif /* HAL_DMA_MODULE_ENABLED */
+   
+#ifdef HAL_CORTEX_MODULE_ENABLED
+  #include "stm32f4xx_hal_cortex.h"
+#endif /* HAL_CORTEX_MODULE_ENABLED */
+
+#ifdef HAL_ADC_MODULE_ENABLED
+  #include "stm32f4xx_hal_adc.h"
+#endif /* HAL_ADC_MODULE_ENABLED */
+
+#ifdef HAL_CAN_MODULE_ENABLED
+  #include "stm32f4xx_hal_can.h"
+#endif /* HAL_CAN_MODULE_ENABLED */
+
+#ifdef HAL_CRC_MODULE_ENABLED
+  #include "stm32f4xx_hal_crc.h"
+#endif /* HAL_CRC_MODULE_ENABLED */
+
+#ifdef HAL_CRYP_MODULE_ENABLED
+  #include "stm32f4xx_hal_cryp.h" 
+#endif /* HAL_CRYP_MODULE_ENABLED */
+
+#ifdef HAL_DMA2D_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma2d.h"
+#endif /* HAL_DMA2D_MODULE_ENABLED */
+
+#ifdef HAL_DAC_MODULE_ENABLED
+  #include "stm32f4xx_hal_dac.h"
+#endif /* HAL_DAC_MODULE_ENABLED */
+
+#ifdef HAL_DCMI_MODULE_ENABLED
+  #include "stm32f4xx_hal_dcmi.h"
+#endif /* HAL_DCMI_MODULE_ENABLED */
+
+#ifdef HAL_ETH_MODULE_ENABLED
+  #include "stm32f4xx_hal_eth.h"
+#endif /* HAL_ETH_MODULE_ENABLED */
+
+#ifdef HAL_FLASH_MODULE_ENABLED
+  #include "stm32f4xx_hal_flash.h"
+#endif /* HAL_FLASH_MODULE_ENABLED */
+ 
+#ifdef HAL_SRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sram.h"
+#endif /* HAL_SRAM_MODULE_ENABLED */
+
+#ifdef HAL_NOR_MODULE_ENABLED
+  #include "stm32f4xx_hal_nor.h"
+#endif /* HAL_NOR_MODULE_ENABLED */
+
+#ifdef HAL_NAND_MODULE_ENABLED
+  #include "stm32f4xx_hal_nand.h"
+#endif /* HAL_NAND_MODULE_ENABLED */
+
+#ifdef HAL_PCCARD_MODULE_ENABLED
+  #include "stm32f4xx_hal_pccard.h"
+#endif /* HAL_PCCARD_MODULE_ENABLED */ 
+  
+#ifdef HAL_SDRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sdram.h"
+#endif /* HAL_SDRAM_MODULE_ENABLED */      
+
+#ifdef HAL_HASH_MODULE_ENABLED
+ #include "stm32f4xx_hal_hash.h"
+#endif /* HAL_HASH_MODULE_ENABLED */
+
+#ifdef HAL_I2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2c.h"
+#endif /* HAL_I2C_MODULE_ENABLED */
+
+#ifdef HAL_I2S_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2s.h"
+#endif /* HAL_I2S_MODULE_ENABLED */
+
+#ifdef HAL_IWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_iwdg.h"
+#endif /* HAL_IWDG_MODULE_ENABLED */
+
+#ifdef HAL_LTDC_MODULE_ENABLED
+ #include "stm32f4xx_hal_ltdc.h"
+#endif /* HAL_LTDC_MODULE_ENABLED */
+
+#ifdef HAL_PWR_MODULE_ENABLED
+ #include "stm32f4xx_hal_pwr.h"
+#endif /* HAL_PWR_MODULE_ENABLED */
+
+#ifdef HAL_RNG_MODULE_ENABLED
+ #include "stm32f4xx_hal_rng.h"
+#endif /* HAL_RNG_MODULE_ENABLED */
+
+#ifdef HAL_RTC_MODULE_ENABLED
+ #include "stm32f4xx_hal_rtc.h"
+#endif /* HAL_RTC_MODULE_ENABLED */
+
+#ifdef HAL_SAI_MODULE_ENABLED
+ #include "stm32f4xx_hal_sai.h"
+#endif /* HAL_SAI_MODULE_ENABLED */
+
+#ifdef HAL_SD_MODULE_ENABLED
+ #include "stm32f4xx_hal_sd.h"
+#endif /* HAL_SD_MODULE_ENABLED */
+
+#ifdef HAL_MMC_MODULE_ENABLED
+ #include "stm32f4xx_hal_mmc.h"
+#endif /* HAL_MMC_MODULE_ENABLED */
+
+#ifdef HAL_SPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_spi.h"
+#endif /* HAL_SPI_MODULE_ENABLED */
+
+#ifdef HAL_TIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_tim.h"
+#endif /* HAL_TIM_MODULE_ENABLED */
+
+#ifdef HAL_UART_MODULE_ENABLED
+ #include "stm32f4xx_hal_uart.h"
+#endif /* HAL_UART_MODULE_ENABLED */
+
+#ifdef HAL_USART_MODULE_ENABLED
+ #include "stm32f4xx_hal_usart.h"
+#endif /* HAL_USART_MODULE_ENABLED */
+
+#ifdef HAL_IRDA_MODULE_ENABLED
+ #include "stm32f4xx_hal_irda.h"
+#endif /* HAL_IRDA_MODULE_ENABLED */
+
+#ifdef HAL_SMARTCARD_MODULE_ENABLED
+ #include "stm32f4xx_hal_smartcard.h"
+#endif /* HAL_SMARTCARD_MODULE_ENABLED */
+
+#ifdef HAL_WWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_wwdg.h"
+#endif /* HAL_WWDG_MODULE_ENABLED */
+
+#ifdef HAL_PCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_pcd.h"
+#endif /* HAL_PCD_MODULE_ENABLED */
+
+#ifdef HAL_HCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_hcd.h"
+#endif /* HAL_HCD_MODULE_ENABLED */
+   
+#ifdef HAL_DSI_MODULE_ENABLED
+ #include "stm32f4xx_hal_dsi.h"
+#endif /* HAL_DSI_MODULE_ENABLED */
+
+#ifdef HAL_QSPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_qspi.h"
+#endif /* HAL_QSPI_MODULE_ENABLED */
+
+#ifdef HAL_CEC_MODULE_ENABLED
+ #include "stm32f4xx_hal_cec.h"
+#endif /* HAL_CEC_MODULE_ENABLED */
+
+#ifdef HAL_FMPI2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_fmpi2c.h"
+#endif /* HAL_FMPI2C_MODULE_ENABLED */
+
+#ifdef HAL_SPDIFRX_MODULE_ENABLED
+ #include "stm32f4xx_hal_spdifrx.h"
+#endif /* HAL_SPDIFRX_MODULE_ENABLED */
+
+#ifdef HAL_DFSDM_MODULE_ENABLED
+ #include "stm32f4xx_hal_dfsdm.h"
+#endif /* HAL_DFSDM_MODULE_ENABLED */
+
+#ifdef HAL_LPTIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_lptim.h"
+#endif /* HAL_LPTIM_MODULE_ENABLED */
+   
+/* Exported macro ------------------------------------------------------------*/
+#ifdef  USE_FULL_ASSERT
+/**
+  * @brief  The assert_param macro is used for function's parameters check.
+  * @param  expr: If expr is false, it calls assert_failed function
+  *         which reports the name of the source file and the source
+  *         line number of the call that failed. 
+  *         If expr is true, it returns no value.
+  * @retval None
+  */
+  #define assert_param(expr) ((expr) ? (void)0U : assert_failed((uint8_t *)__FILE__, __LINE__))
+/* Exported functions ------------------------------------------------------- */
+  void assert_failed(uint8_t* file, uint32_t line);
+#else
+  #define assert_param(expr) ((void)0U)
+#endif /* USE_FULL_ASSERT */    
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __STM32F4xx_HAL_CONF_H */
+ 
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/ports/stm/boards/pyboard_v11/board.c b/ports/stm/boards/pyboard_v11/board.c
new file mode 100644
index 000000000..4421970ee
--- /dev/null
+++ b/ports/stm/boards/pyboard_v11/board.c
@@ -0,0 +1,38 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "boards/board.h"
+
+void board_init(void) {
+}
+
+bool board_requests_safe_mode(void) {
+  return false;
+}
+
+void reset_board(void) {
+
+}
diff --git a/ports/stm/boards/pyboard_v11/mpconfigboard.h b/ports/stm/boards/pyboard_v11/mpconfigboard.h
new file mode 100644
index 000000000..398731d30
--- /dev/null
+++ b/ports/stm/boards/pyboard_v11/mpconfigboard.h
@@ -0,0 +1,38 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+//Micropython setup
+
+#define MICROPY_HW_BOARD_NAME       "PyboardV1_1"
+#define MICROPY_HW_MCU_NAME         "STM32F405RG"
+
+#define FLASH_SIZE                  (0x100000)
+#define FLASH_PAGE_SIZE             (0x4000)
+
+#define BOARD_OSC_DIV (12)
+
+#define DEFAULT_I2C_BUS_SCL (&pin_PB06)
+#define DEFAULT_I2C_BUS_SDA (&pin_PB07)
diff --git a/ports/stm/boards/pyboard_v11/mpconfigboard.mk b/ports/stm/boards/pyboard_v11/mpconfigboard.mk
new file mode 100644
index 000000000..ef1b8f0ca
--- /dev/null
+++ b/ports/stm/boards/pyboard_v11/mpconfigboard.mk
@@ -0,0 +1,16 @@
+USB_VID = 0x239A
+USB_PID = 0x805C
+USB_PRODUCT = "Pyboard Version 1.1"
+USB_MANUFACTURER = "George Robotic"
+USB_DEVICES = "CDC,MSC"
+
+INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL = NONE
+
+MCU_SERIES = m4
+MCU_VARIANT = stm32f4
+MCU_SUB_VARIANT = stm32f405xx
+MCU_PACKAGE = 64
+CMSIS_MCU = STM32F405xx
+LD_FILE = boards/STM32F405_fs.ld
+
diff --git a/ports/stm/boards/pyboard_v11/pins.c b/ports/stm/boards/pyboard_v11/pins.c
new file mode 100644
index 000000000..8783dfcf1
--- /dev/null
+++ b/ports/stm/boards/pyboard_v11/pins.c
@@ -0,0 +1,52 @@
+#include "shared-bindings/board/__init__.h"
+
+STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_Y1), MP_ROM_PTR(&pin_PC06) },
+    { MP_ROM_QSTR(MP_QSTR_Y2), MP_ROM_PTR(&pin_PC07) },
+    { MP_ROM_QSTR(MP_QSTR_Y3), MP_ROM_PTR(&pin_PB08) },
+    { MP_ROM_QSTR(MP_QSTR_Y4), MP_ROM_PTR(&pin_PB09) },
+    { MP_ROM_QSTR(MP_QSTR_Y5), MP_ROM_PTR(&pin_PB12) },
+    { MP_ROM_QSTR(MP_QSTR_Y6), MP_ROM_PTR(&pin_PB13) },
+    { MP_ROM_QSTR(MP_QSTR_Y7), MP_ROM_PTR(&pin_PB14) },
+    { MP_ROM_QSTR(MP_QSTR_Y8), MP_ROM_PTR(&pin_PB15) },
+    { MP_ROM_QSTR(MP_QSTR_Y9), MP_ROM_PTR(&pin_PB10) },
+    { MP_ROM_QSTR(MP_QSTR_Y10), MP_ROM_PTR(&pin_PB11) },
+    { MP_ROM_QSTR(MP_QSTR_Y11), MP_ROM_PTR(&pin_PB00) },
+    { MP_ROM_QSTR(MP_QSTR_Y12), MP_ROM_PTR(&pin_PB01) },
+
+    { MP_ROM_QSTR(MP_QSTR_X1), MP_ROM_PTR(&pin_PA00) },
+    { MP_ROM_QSTR(MP_QSTR_X2), MP_ROM_PTR(&pin_PA01) },
+    { MP_ROM_QSTR(MP_QSTR_X3), MP_ROM_PTR(&pin_PA02) },
+    { MP_ROM_QSTR(MP_QSTR_X4), MP_ROM_PTR(&pin_PA03) },
+    { MP_ROM_QSTR(MP_QSTR_X5), MP_ROM_PTR(&pin_PA04) },
+    { MP_ROM_QSTR(MP_QSTR_X6), MP_ROM_PTR(&pin_PA05) },
+    { MP_ROM_QSTR(MP_QSTR_X7), MP_ROM_PTR(&pin_PA06) },
+    { MP_ROM_QSTR(MP_QSTR_X8), MP_ROM_PTR(&pin_PA07) },
+    { MP_ROM_QSTR(MP_QSTR_X9), MP_ROM_PTR(&pin_PB06) },
+    { MP_ROM_QSTR(MP_QSTR_X10), MP_ROM_PTR(&pin_PB07) },
+    { MP_ROM_QSTR(MP_QSTR_X11), MP_ROM_PTR(&pin_PC04) },
+    { MP_ROM_QSTR(MP_QSTR_X12), MP_ROM_PTR(&pin_PC05) },
+
+    { MP_ROM_QSTR(MP_QSTR_X17), MP_ROM_PTR(&pin_PB03) },
+    { MP_ROM_QSTR(MP_QSTR_X18), MP_ROM_PTR(&pin_PC13) },
+    { MP_ROM_QSTR(MP_QSTR_X19), MP_ROM_PTR(&pin_PC00) },
+    { MP_ROM_QSTR(MP_QSTR_X20), MP_ROM_PTR(&pin_PC01) },
+    { MP_ROM_QSTR(MP_QSTR_X21), MP_ROM_PTR(&pin_PC02) },
+    { MP_ROM_QSTR(MP_QSTR_X22), MP_ROM_PTR(&pin_PC03) },
+
+    { MP_ROM_QSTR(MP_QSTR_P2), MP_ROM_PTR(&pin_PB04) },
+    { MP_ROM_QSTR(MP_QSTR_P3), MP_ROM_PTR(&pin_PA15) },
+    { MP_ROM_QSTR(MP_QSTR_P4), MP_ROM_PTR(&pin_PA14) },
+    { MP_ROM_QSTR(MP_QSTR_P5), MP_ROM_PTR(&pin_PA13) },
+
+    { MP_ROM_QSTR(MP_QSTR_LED1), MP_ROM_PTR(&pin_PB04) },
+    { MP_ROM_QSTR(MP_QSTR_LED2), MP_ROM_PTR(&pin_PA15) },
+    { MP_ROM_QSTR(MP_QSTR_LED3), MP_ROM_PTR(&pin_PA14) },
+    { MP_ROM_QSTR(MP_QSTR_LED4), MP_ROM_PTR(&pin_PA13) },
+
+    { MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_PB06) },
+    { MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_PB07) },
+
+    { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+};
+MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/stm/boards/pyboard_v11/stm32f4xx_hal_conf.h b/ports/stm/boards/pyboard_v11/stm32f4xx_hal_conf.h
new file mode 100644
index 000000000..4dc18cb7f
--- /dev/null
+++ b/ports/stm/boards/pyboard_v11/stm32f4xx_hal_conf.h
@@ -0,0 +1,440 @@
+/**
+  ******************************************************************************
+  * @file    stm32f4xx_hal_conf_template.h
+  * @author  MCD Application Team
+  * @brief   HAL configuration template file. 
+  *          This file should be copied to the application folder and renamed
+  *          to stm32f4xx_hal_conf.h.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */ 
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __STM32F4xx_HAL_CONF_H
+#define __STM32F4xx_HAL_CONF_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+
+/* ########################## Module Selection ############################## */
+/**
+  * @brief This is the list of modules to be used in the HAL driver 
+  */
+#define HAL_MODULE_ENABLED  
+
+#define HAL_ADC_MODULE_ENABLED
+/* #define HAL_CRYP_MODULE_ENABLED   */
+/* #define HAL_CAN_MODULE_ENABLED   */
+/* #define HAL_CRC_MODULE_ENABLED   */
+/* #define HAL_CRYP_MODULE_ENABLED   */
+#define HAL_DAC_MODULE_ENABLED
+/* #define HAL_DCMI_MODULE_ENABLED   */
+/* #define HAL_DMA2D_MODULE_ENABLED   */
+/* #define HAL_ETH_MODULE_ENABLED   */
+/* #define HAL_NAND_MODULE_ENABLED   */
+/* #define HAL_NOR_MODULE_ENABLED   */
+/* #define HAL_PCCARD_MODULE_ENABLED   */
+/* #define HAL_SRAM_MODULE_ENABLED   */
+/* #define HAL_SDRAM_MODULE_ENABLED   */
+/* #define HAL_HASH_MODULE_ENABLED   */
+#define HAL_I2C_MODULE_ENABLED
+#define HAL_I2S_MODULE_ENABLED
+/* #define HAL_IWDG_MODULE_ENABLED   */
+/* #define HAL_LTDC_MODULE_ENABLED   */
+#define HAL_RNG_MODULE_ENABLED
+/* #define HAL_RTC_MODULE_ENABLED   */
+/* #define HAL_SAI_MODULE_ENABLED   */
+/* #define HAL_SD_MODULE_ENABLED   */
+/* #define HAL_MMC_MODULE_ENABLED   */
+#define HAL_SPI_MODULE_ENABLED
+#define HAL_TIM_MODULE_ENABLED
+#define HAL_UART_MODULE_ENABLED   
+/* #define HAL_USART_MODULE_ENABLED   */
+/* #define HAL_IRDA_MODULE_ENABLED   */
+/* #define HAL_SMARTCARD_MODULE_ENABLED   */
+/* #define HAL_WWDG_MODULE_ENABLED   */
+#define HAL_PCD_MODULE_ENABLED
+/* #define HAL_HCD_MODULE_ENABLED   */
+/* #define HAL_DSI_MODULE_ENABLED   */
+/* #define HAL_QSPI_MODULE_ENABLED   */
+/* #define HAL_QSPI_MODULE_ENABLED   */
+/* #define HAL_CEC_MODULE_ENABLED   */
+/* #define HAL_FMPI2C_MODULE_ENABLED   */
+/* #define HAL_SPDIFRX_MODULE_ENABLED   */
+/* #define HAL_DFSDM_MODULE_ENABLED   */
+/* #define HAL_LPTIM_MODULE_ENABLED   */
+/* #define HAL_EXTI_MODULE_ENABLED   */
+#define HAL_GPIO_MODULE_ENABLED
+#define HAL_EXTI_MODULE_ENABLED
+#define HAL_DMA_MODULE_ENABLED
+#define HAL_RCC_MODULE_ENABLED
+#define HAL_FLASH_MODULE_ENABLED
+#define HAL_PWR_MODULE_ENABLED
+#define HAL_CORTEX_MODULE_ENABLED
+
+/* ########################## HSE/HSI Values adaptation ##################### */
+/**
+  * @brief Adjust the value of External High Speed oscillator (HSE) used in your application.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSE is used as system clock source, directly or through the PLL).  
+  */
+#if !defined  (HSE_VALUE) 
+  #define HSE_VALUE    ((uint32_t)12000000) /*!< Value of the External oscillator in Hz */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSE_STARTUP_TIMEOUT)
+  #define HSE_STARTUP_TIMEOUT    ((uint32_t)100U)   /*!< Time out for HSE start up, in ms */
+#endif /* HSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief Internal High Speed oscillator (HSI) value.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSI is used as system clock source, directly or through the PLL). 
+  */
+#if !defined  (HSI_VALUE)
+  #define HSI_VALUE    ((uint32_t)16000000) /*!< Value of the Internal oscillator in Hz*/
+#endif /* HSI_VALUE */
+
+/**
+  * @brief Internal Low Speed oscillator (LSI) value.
+  */
+#if !defined  (LSI_VALUE) 
+ #define LSI_VALUE  ((uint32_t)40000)    
+#endif /* LSI_VALUE */                      /*!< Value of the Internal Low Speed oscillator in Hz
+                                             The real value may vary depending on the variations
+                                             in voltage and temperature.  */
+/**
+  * @brief External Low Speed oscillator (LSE) value.
+  */
+#if !defined  (LSE_VALUE)
+ #define LSE_VALUE  ((uint32_t)32768)    /*!< Value of the External Low Speed oscillator in Hz */
+#endif /* LSE_VALUE */
+
+#if !defined  (LSE_STARTUP_TIMEOUT)
+  #define LSE_STARTUP_TIMEOUT    ((uint32_t)5000U)   /*!< Time out for LSE start up, in ms */
+#endif /* LSE_STARTUP_TIMEOUT */
+
+
+/**
+  * @brief External clock source for I2S peripheral
+  *        This value is used by the I2S HAL module to compute the I2S clock source 
+  *        frequency, this source is inserted directly through I2S_CKIN pad. 
+  */
+#if !defined  (EXTERNAL_CLOCK_VALUE)
+  #define EXTERNAL_CLOCK_VALUE    ((uint32_t)12288000U) /*!< Value of the External audio frequency in Hz*/
+#endif /* EXTERNAL_CLOCK_VALUE */
+
+/* Tip: To avoid modifying this file each time you need to use different HSE,
+   ===  you can define the HSE value in your toolchain compiler preprocessor. */
+
+/* ########################### System Configuration ######################### */
+/**
+  * @brief This is the HAL system configuration section
+  */
+#define  VDD_VALUE          ((uint32_t)3300U) /*!< Value of VDD in mv */           
+#define  TICK_INT_PRIORITY            ((uint32_t)0U)   /*!< tick interrupt priority */            
+#define  USE_RTOS                     0U     
+#define  PREFETCH_ENABLE              1U
+#define  INSTRUCTION_CACHE_ENABLE     1U
+#define  DATA_CACHE_ENABLE            1U
+
+/* ########################## Assert Selection ############################## */
+/**
+  * @brief Uncomment the line below to expanse the "assert_param" macro in the 
+  *        HAL drivers code
+  */
+/* #define USE_FULL_ASSERT    1U */
+
+/* ################## Ethernet peripheral configuration ##################### */
+
+/* Section 1 : Ethernet peripheral configuration */
+
+/* MAC ADDRESS: MAC_ADDR0:MAC_ADDR1:MAC_ADDR2:MAC_ADDR3:MAC_ADDR4:MAC_ADDR5 */
+#define MAC_ADDR0   2U
+#define MAC_ADDR1   0U
+#define MAC_ADDR2   0U
+#define MAC_ADDR3   0U
+#define MAC_ADDR4   0U
+#define MAC_ADDR5   0U
+
+/* Definition of the Ethernet driver buffers size and count */   
+#define ETH_RX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for receive               */
+#define ETH_TX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for transmit              */
+#define ETH_RXBUFNB                    ((uint32_t)4U)       /* 4 Rx buffers of size ETH_RX_BUF_SIZE  */
+#define ETH_TXBUFNB                    ((uint32_t)4U)       /* 4 Tx buffers of size ETH_TX_BUF_SIZE  */
+
+/* Section 2: PHY configuration section */
+
+/* DP83848_PHY_ADDRESS Address*/ 
+#define DP83848_PHY_ADDRESS           0x01U
+/* PHY Reset delay these values are based on a 1 ms Systick interrupt*/ 
+#define PHY_RESET_DELAY                 ((uint32_t)0x000000FFU)
+/* PHY Configuration delay */
+#define PHY_CONFIG_DELAY                ((uint32_t)0x00000FFFU)
+
+#define PHY_READ_TO                     ((uint32_t)0x0000FFFFU)
+#define PHY_WRITE_TO                    ((uint32_t)0x0000FFFFU)
+
+/* Section 3: Common PHY Registers */
+
+#define PHY_BCR                         ((uint16_t)0x0000U)    /*!< Transceiver Basic Control Register   */
+#define PHY_BSR                         ((uint16_t)0x0001U)    /*!< Transceiver Basic Status Register    */
+ 
+#define PHY_RESET                       ((uint16_t)0x8000U)  /*!< PHY Reset */
+#define PHY_LOOPBACK                    ((uint16_t)0x4000U)  /*!< Select loop-back mode */
+#define PHY_FULLDUPLEX_100M             ((uint16_t)0x2100U)  /*!< Set the full-duplex mode at 100 Mb/s */
+#define PHY_HALFDUPLEX_100M             ((uint16_t)0x2000U)  /*!< Set the half-duplex mode at 100 Mb/s */
+#define PHY_FULLDUPLEX_10M              ((uint16_t)0x0100U)  /*!< Set the full-duplex mode at 10 Mb/s  */
+#define PHY_HALFDUPLEX_10M              ((uint16_t)0x0000U)  /*!< Set the half-duplex mode at 10 Mb/s  */
+#define PHY_AUTONEGOTIATION             ((uint16_t)0x1000U)  /*!< Enable auto-negotiation function     */
+#define PHY_RESTART_AUTONEGOTIATION     ((uint16_t)0x0200U)  /*!< Restart auto-negotiation function    */
+#define PHY_POWERDOWN                   ((uint16_t)0x0800U)  /*!< Select the power down mode           */
+#define PHY_ISOLATE                     ((uint16_t)0x0400U)  /*!< Isolate PHY from MII                 */
+
+#define PHY_AUTONEGO_COMPLETE           ((uint16_t)0x0020U)  /*!< Auto-Negotiation process completed   */
+#define PHY_LINKED_STATUS               ((uint16_t)0x0004U)  /*!< Valid link established               */
+#define PHY_JABBER_DETECTION            ((uint16_t)0x0002U)  /*!< Jabber condition detected            */
+  
+/* Section 4: Extended PHY Registers */
+#define PHY_SR                          ((uint16_t)0x10U)    /*!< PHY status register Offset                      */
+
+#define PHY_SPEED_STATUS                ((uint16_t)0x0002U)  /*!< PHY Speed mask                                  */
+#define PHY_DUPLEX_STATUS               ((uint16_t)0x0004U)  /*!< PHY Duplex mask                                 */
+
+/* ################## SPI peripheral configuration ########################## */
+
+/* CRC FEATURE: Use to activate CRC feature inside HAL SPI Driver
+* Activated: CRC code is present inside driver
+* Deactivated: CRC code cleaned from driver
+*/
+
+#define USE_SPI_CRC                     0U
+
+/* Includes ------------------------------------------------------------------*/
+/**
+  * @brief Include module's header file 
+  */
+
+#ifdef HAL_RCC_MODULE_ENABLED
+  #include "stm32f4xx_hal_rcc.h"
+#endif /* HAL_RCC_MODULE_ENABLED */
+
+#ifdef HAL_EXTI_MODULE_ENABLED
+  #include "stm32f4xx_hal_exti.h"
+#endif /* HAL_EXTI_MODULE_ENABLED */
+
+#ifdef HAL_GPIO_MODULE_ENABLED
+  #include "stm32f4xx_hal_gpio.h"
+#endif /* HAL_GPIO_MODULE_ENABLED */
+
+#ifdef HAL_DMA_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma.h"
+#endif /* HAL_DMA_MODULE_ENABLED */
+   
+#ifdef HAL_CORTEX_MODULE_ENABLED
+  #include "stm32f4xx_hal_cortex.h"
+#endif /* HAL_CORTEX_MODULE_ENABLED */
+
+#ifdef HAL_ADC_MODULE_ENABLED
+  #include "stm32f4xx_hal_adc.h"
+#endif /* HAL_ADC_MODULE_ENABLED */
+
+#ifdef HAL_CAN_MODULE_ENABLED
+  #include "stm32f4xx_hal_can.h"
+#endif /* HAL_CAN_MODULE_ENABLED */
+
+#ifdef HAL_CRC_MODULE_ENABLED
+  #include "stm32f4xx_hal_crc.h"
+#endif /* HAL_CRC_MODULE_ENABLED */
+
+#ifdef HAL_CRYP_MODULE_ENABLED
+  #include "stm32f4xx_hal_cryp.h" 
+#endif /* HAL_CRYP_MODULE_ENABLED */
+
+#ifdef HAL_DMA2D_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma2d.h"
+#endif /* HAL_DMA2D_MODULE_ENABLED */
+
+#ifdef HAL_DAC_MODULE_ENABLED
+  #include "stm32f4xx_hal_dac.h"
+#endif /* HAL_DAC_MODULE_ENABLED */
+
+#ifdef HAL_DCMI_MODULE_ENABLED
+  #include "stm32f4xx_hal_dcmi.h"
+#endif /* HAL_DCMI_MODULE_ENABLED */
+
+#ifdef HAL_ETH_MODULE_ENABLED
+  #include "stm32f4xx_hal_eth.h"
+#endif /* HAL_ETH_MODULE_ENABLED */
+
+#ifdef HAL_FLASH_MODULE_ENABLED
+  #include "stm32f4xx_hal_flash.h"
+#endif /* HAL_FLASH_MODULE_ENABLED */
+ 
+#ifdef HAL_SRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sram.h"
+#endif /* HAL_SRAM_MODULE_ENABLED */
+
+#ifdef HAL_NOR_MODULE_ENABLED
+  #include "stm32f4xx_hal_nor.h"
+#endif /* HAL_NOR_MODULE_ENABLED */
+
+#ifdef HAL_NAND_MODULE_ENABLED
+  #include "stm32f4xx_hal_nand.h"
+#endif /* HAL_NAND_MODULE_ENABLED */
+
+#ifdef HAL_PCCARD_MODULE_ENABLED
+  #include "stm32f4xx_hal_pccard.h"
+#endif /* HAL_PCCARD_MODULE_ENABLED */ 
+  
+#ifdef HAL_SDRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sdram.h"
+#endif /* HAL_SDRAM_MODULE_ENABLED */      
+
+#ifdef HAL_HASH_MODULE_ENABLED
+ #include "stm32f4xx_hal_hash.h"
+#endif /* HAL_HASH_MODULE_ENABLED */
+
+#ifdef HAL_I2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2c.h"
+#endif /* HAL_I2C_MODULE_ENABLED */
+
+#ifdef HAL_I2S_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2s.h"
+#endif /* HAL_I2S_MODULE_ENABLED */
+
+#ifdef HAL_IWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_iwdg.h"
+#endif /* HAL_IWDG_MODULE_ENABLED */
+
+#ifdef HAL_LTDC_MODULE_ENABLED
+ #include "stm32f4xx_hal_ltdc.h"
+#endif /* HAL_LTDC_MODULE_ENABLED */
+
+#ifdef HAL_PWR_MODULE_ENABLED
+ #include "stm32f4xx_hal_pwr.h"
+#endif /* HAL_PWR_MODULE_ENABLED */
+
+#ifdef HAL_RNG_MODULE_ENABLED
+ #include "stm32f4xx_hal_rng.h"
+#endif /* HAL_RNG_MODULE_ENABLED */
+
+#ifdef HAL_RTC_MODULE_ENABLED
+ #include "stm32f4xx_hal_rtc.h"
+#endif /* HAL_RTC_MODULE_ENABLED */
+
+#ifdef HAL_SAI_MODULE_ENABLED
+ #include "stm32f4xx_hal_sai.h"
+#endif /* HAL_SAI_MODULE_ENABLED */
+
+#ifdef HAL_SD_MODULE_ENABLED
+ #include "stm32f4xx_hal_sd.h"
+#endif /* HAL_SD_MODULE_ENABLED */
+
+#ifdef HAL_MMC_MODULE_ENABLED
+ #include "stm32f4xx_hal_mmc.h"
+#endif /* HAL_MMC_MODULE_ENABLED */
+
+#ifdef HAL_SPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_spi.h"
+#endif /* HAL_SPI_MODULE_ENABLED */
+
+#ifdef HAL_TIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_tim.h"
+#endif /* HAL_TIM_MODULE_ENABLED */
+
+#ifdef HAL_UART_MODULE_ENABLED
+ #include "stm32f4xx_hal_uart.h"
+#endif /* HAL_UART_MODULE_ENABLED */
+
+#ifdef HAL_USART_MODULE_ENABLED
+ #include "stm32f4xx_hal_usart.h"
+#endif /* HAL_USART_MODULE_ENABLED */
+
+#ifdef HAL_IRDA_MODULE_ENABLED
+ #include "stm32f4xx_hal_irda.h"
+#endif /* HAL_IRDA_MODULE_ENABLED */
+
+#ifdef HAL_SMARTCARD_MODULE_ENABLED
+ #include "stm32f4xx_hal_smartcard.h"
+#endif /* HAL_SMARTCARD_MODULE_ENABLED */
+
+#ifdef HAL_WWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_wwdg.h"
+#endif /* HAL_WWDG_MODULE_ENABLED */
+
+#ifdef HAL_PCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_pcd.h"
+#endif /* HAL_PCD_MODULE_ENABLED */
+
+#ifdef HAL_HCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_hcd.h"
+#endif /* HAL_HCD_MODULE_ENABLED */
+   
+#ifdef HAL_DSI_MODULE_ENABLED
+ #include "stm32f4xx_hal_dsi.h"
+#endif /* HAL_DSI_MODULE_ENABLED */
+
+#ifdef HAL_QSPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_qspi.h"
+#endif /* HAL_QSPI_MODULE_ENABLED */
+
+#ifdef HAL_CEC_MODULE_ENABLED
+ #include "stm32f4xx_hal_cec.h"
+#endif /* HAL_CEC_MODULE_ENABLED */
+
+#ifdef HAL_FMPI2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_fmpi2c.h"
+#endif /* HAL_FMPI2C_MODULE_ENABLED */
+
+#ifdef HAL_SPDIFRX_MODULE_ENABLED
+ #include "stm32f4xx_hal_spdifrx.h"
+#endif /* HAL_SPDIFRX_MODULE_ENABLED */
+
+#ifdef HAL_DFSDM_MODULE_ENABLED
+ #include "stm32f4xx_hal_dfsdm.h"
+#endif /* HAL_DFSDM_MODULE_ENABLED */
+
+#ifdef HAL_LPTIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_lptim.h"
+#endif /* HAL_LPTIM_MODULE_ENABLED */
+   
+/* Exported macro ------------------------------------------------------------*/
+#ifdef  USE_FULL_ASSERT
+/**
+  * @brief  The assert_param macro is used for function's parameters check.
+  * @param  expr: If expr is false, it calls assert_failed function
+  *         which reports the name of the source file and the source
+  *         line number of the call that failed. 
+  *         If expr is true, it returns no value.
+  * @retval None
+  */
+  #define assert_param(expr) ((expr) ? (void)0U : assert_failed((uint8_t *)__FILE__, __LINE__))
+/* Exported functions ------------------------------------------------------- */
+  void assert_failed(uint8_t* file, uint32_t line);
+#else
+  #define assert_param(expr) ((void)0U)
+#endif /* USE_FULL_ASSERT */    
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __STM32F4xx_HAL_CONF_H */
+ 
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/ports/stm/boards/startup_stm32f401xe.s b/ports/stm/boards/startup_stm32f401xe.s
new file mode 100644
index 000000000..815ac1719
--- /dev/null
+++ b/ports/stm/boards/startup_stm32f401xe.s
@@ -0,0 +1,448 @@
+/**
+  ******************************************************************************
+  * @file      startup_stm32f401xe.s
+  * @author    MCD Application Team
+  * @brief     STM32F401xExx Devices vector table for GCC based toolchains. 
+  *            This module performs:
+  *                - Set the initial SP
+  *                - Set the initial PC == Reset_Handler,
+  *                - Set the vector table entries with the exceptions ISR address
+  *                - Branches to main in the C library (which eventually
+  *                  calls main()).
+  *            After Reset the Cortex-M4 processor is in Thread mode,
+  *            priority is Privileged, and the Stack is set to Main.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT 2017 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+    
+  .syntax unified
+  .cpu cortex-m4
+  .fpu softvfp
+  .thumb
+
+.global  g_pfnVectors
+.global  Default_Handler
+
+/* start address for the initialization values of the .data section. 
+defined in linker script */
+.word  _sidata
+/* start address for the .data section. defined in linker script */  
+.word  _sdata
+/* end address for the .data section. defined in linker script */
+.word  _edata
+/* start address for the .bss section. defined in linker script */
+.word  _sbss
+/* end address for the .bss section. defined in linker script */
+.word  _ebss
+/* stack used for SystemInit_ExtMemCtl; always internal RAM used */
+
+/**
+ * @brief  This is the code that gets called when the processor first
+ *          starts execution following a reset event. Only the absolutely
+ *          necessary set is performed, after which the application
+ *          supplied main() routine is called. 
+ * @param  None
+ * @retval : None
+*/
+
+    .section  .text.Reset_Handler
+  .weak  Reset_Handler
+  .type  Reset_Handler, %function
+Reset_Handler:  
+  ldr   sp, =_estack    		 /* set stack pointer */
+
+/* Copy the data segment initializers from flash to SRAM */  
+  movs  r1, #0
+  b  LoopCopyDataInit
+
+CopyDataInit:
+  ldr  r3, =_sidata
+  ldr  r3, [r3, r1]
+  str  r3, [r0, r1]
+  adds  r1, r1, #4
+    
+LoopCopyDataInit:
+  ldr  r0, =_sdata
+  ldr  r3, =_edata
+  adds  r2, r0, r1
+  cmp  r2, r3
+  bcc  CopyDataInit
+  ldr  r2, =_sbss
+  b  LoopFillZerobss
+/* Zero fill the bss segment. */  
+FillZerobss:
+  movs  r3, #0
+  str  r3, [r2], #4
+    
+LoopFillZerobss:
+  ldr  r3, = _ebss
+  cmp  r2, r3
+  bcc  FillZerobss
+
+/* Call the clock system intitialization function.*/
+  bl  SystemInit   
+/* Call static constructors */
+  /*  bl __libc_init_array */
+/* Call the application's entry point.*/
+  bl  main
+  bx  lr    
+.size  Reset_Handler, .-Reset_Handler
+
+/**
+ * @brief  This is the code that gets called when the processor receives an 
+ *         unexpected interrupt.  This simply enters an infinite loop, preserving
+ *         the system state for examination by a debugger.
+ * @param  None     
+ * @retval None       
+*/
+    .section  .text.Default_Handler,"ax",%progbits
+Default_Handler:
+Infinite_Loop:
+  b  Infinite_Loop
+  .size  Default_Handler, .-Default_Handler
+/******************************************************************************
+*
+* The minimal vector table for a Cortex M3. Note that the proper constructs
+* must be placed on this to ensure that it ends up at physical address
+* 0x0000.0000.
+* 
+*******************************************************************************/
+   .section  .isr_vector,"a",%progbits
+  .type  g_pfnVectors, %object
+  .size  g_pfnVectors, .-g_pfnVectors
+    
+g_pfnVectors:
+  .word  _estack
+  .word  Reset_Handler
+  .word  NMI_Handler
+  .word  HardFault_Handler
+  .word  MemManage_Handler
+  .word  BusFault_Handler
+  .word  UsageFault_Handler
+  .word  0
+  .word  0
+  .word  0
+  .word  0
+  .word  SVC_Handler
+  .word  DebugMon_Handler
+  .word  0
+  .word  PendSV_Handler
+  .word  SysTick_Handler
+  
+  /* External Interrupts */
+  .word     WWDG_IRQHandler                   /* Window WatchDog              */                                        
+  .word     PVD_IRQHandler                    /* PVD through EXTI Line detection */                        
+  .word     TAMP_STAMP_IRQHandler             /* Tamper and TimeStamps through the EXTI line */            
+  .word     RTC_WKUP_IRQHandler               /* RTC Wakeup through the EXTI line */                      
+  .word     FLASH_IRQHandler                  /* FLASH                        */                                          
+  .word     RCC_IRQHandler                    /* RCC                          */                                            
+  .word     EXTI0_IRQHandler                  /* EXTI Line0                   */                        
+  .word     EXTI1_IRQHandler                  /* EXTI Line1                   */                          
+  .word     EXTI2_IRQHandler                  /* EXTI Line2                   */                          
+  .word     EXTI3_IRQHandler                  /* EXTI Line3                   */                          
+  .word     EXTI4_IRQHandler                  /* EXTI Line4                   */                          
+  .word     DMA1_Stream0_IRQHandler           /* DMA1 Stream 0                */                  
+  .word     DMA1_Stream1_IRQHandler           /* DMA1 Stream 1                */                   
+  .word     DMA1_Stream2_IRQHandler           /* DMA1 Stream 2                */                   
+  .word     DMA1_Stream3_IRQHandler           /* DMA1 Stream 3                */                   
+  .word     DMA1_Stream4_IRQHandler           /* DMA1 Stream 4                */                   
+  .word     DMA1_Stream5_IRQHandler           /* DMA1 Stream 5                */                   
+  .word     DMA1_Stream6_IRQHandler           /* DMA1 Stream 6                */                   
+  .word     ADC_IRQHandler                    /* ADC1, ADC2 and ADC3s         */                   
+  .word     0               				  /* Reserved                      */                         
+  .word     0              					  /* Reserved                     */                          
+  .word     0                                 /* Reserved                     */                          
+  .word     0                                 /* Reserved                     */                          
+  .word     EXTI9_5_IRQHandler                /* External Line[9:5]s          */                          
+  .word     TIM1_BRK_TIM9_IRQHandler          /* TIM1 Break and TIM9          */         
+  .word     TIM1_UP_TIM10_IRQHandler          /* TIM1 Update and TIM10        */         
+  .word     TIM1_TRG_COM_TIM11_IRQHandler     /* TIM1 Trigger and Commutation and TIM11 */
+  .word     TIM1_CC_IRQHandler                /* TIM1 Capture Compare         */                          
+  .word     TIM2_IRQHandler                   /* TIM2                         */                   
+  .word     TIM3_IRQHandler                   /* TIM3                         */                   
+  .word     TIM4_IRQHandler                   /* TIM4                         */                   
+  .word     I2C1_EV_IRQHandler                /* I2C1 Event                   */                          
+  .word     I2C1_ER_IRQHandler                /* I2C1 Error                   */                          
+  .word     I2C2_EV_IRQHandler                /* I2C2 Event                   */                          
+  .word     I2C2_ER_IRQHandler                /* I2C2 Error                   */                            
+  .word     SPI1_IRQHandler                   /* SPI1                         */                   
+  .word     SPI2_IRQHandler                   /* SPI2                         */                   
+  .word     USART1_IRQHandler                 /* USART1                       */                   
+  .word     USART2_IRQHandler                 /* USART2                       */                   
+  .word     0               				  /* Reserved                       */                   
+  .word     EXTI15_10_IRQHandler              /* External Line[15:10]s        */                          
+  .word     RTC_Alarm_IRQHandler              /* RTC Alarm (A and B) through EXTI Line */                 
+  .word     OTG_FS_WKUP_IRQHandler            /* USB OTG FS Wakeup through EXTI line */                       
+  .word     0                                 /* Reserved     				  */         
+  .word     0                                 /* Reserved       			  */         
+  .word     0                                 /* Reserved 					  */
+  .word     0                                 /* Reserved                     */                          
+  .word     DMA1_Stream7_IRQHandler           /* DMA1 Stream7                 */                          
+  .word     0                                 /* Reserved                     */                   
+  .word     SDIO_IRQHandler                   /* SDIO                         */                   
+  .word     TIM5_IRQHandler                   /* TIM5                         */                   
+  .word     SPI3_IRQHandler                   /* SPI3                         */                   
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */
+  .word     DMA2_Stream0_IRQHandler           /* DMA2 Stream 0                */                   
+  .word     DMA2_Stream1_IRQHandler           /* DMA2 Stream 1                */                   
+  .word     DMA2_Stream2_IRQHandler           /* DMA2 Stream 2                */                   
+  .word     DMA2_Stream3_IRQHandler           /* DMA2 Stream 3                */                   
+  .word     DMA2_Stream4_IRQHandler           /* DMA2 Stream 4                */                   
+  .word     0                    			  /* Reserved                     */                   
+  .word     0              					  /* Reserved                     */                     
+  .word     0              					  /* Reserved                     */                          
+  .word     0             					  /* Reserved                     */                          
+  .word     0              					  /* Reserved                     */                          
+  .word     0              					  /* Reserved                     */                          
+  .word     OTG_FS_IRQHandler                 /* USB OTG FS                   */                   
+  .word     DMA2_Stream5_IRQHandler           /* DMA2 Stream 5                */                   
+  .word     DMA2_Stream6_IRQHandler           /* DMA2 Stream 6                */                   
+  .word     DMA2_Stream7_IRQHandler           /* DMA2 Stream 7                */                   
+  .word     USART6_IRQHandler                 /* USART6                       */                    
+  .word     I2C3_EV_IRQHandler                /* I2C3 event                   */                          
+  .word     I2C3_ER_IRQHandler                /* I2C3 error                   */                          
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */                         
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */
+  .word     FPU_IRQHandler                    /* FPU                          */
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */
+  .word     SPI4_IRQHandler                   /* SPI4                         */     
+                    
+/*******************************************************************************
+*
+* Provide weak aliases for each Exception handler to the Default_Handler. 
+* As they are weak aliases, any function with the same name will override 
+* this definition.
+* 
+*******************************************************************************/
+   .weak      NMI_Handler
+   .thumb_set NMI_Handler,Default_Handler
+  
+   .weak      HardFault_Handler
+   .thumb_set HardFault_Handler,Default_Handler
+  
+   .weak      MemManage_Handler
+   .thumb_set MemManage_Handler,Default_Handler
+  
+   .weak      BusFault_Handler
+   .thumb_set BusFault_Handler,Default_Handler
+
+   .weak      UsageFault_Handler
+   .thumb_set UsageFault_Handler,Default_Handler
+
+   .weak      SVC_Handler
+   .thumb_set SVC_Handler,Default_Handler
+
+   .weak      DebugMon_Handler
+   .thumb_set DebugMon_Handler,Default_Handler
+
+   .weak      PendSV_Handler
+   .thumb_set PendSV_Handler,Default_Handler
+
+   .weak      SysTick_Handler
+   .thumb_set SysTick_Handler,Default_Handler              
+  
+   .weak      WWDG_IRQHandler                   
+   .thumb_set WWDG_IRQHandler,Default_Handler      
+                  
+   .weak      PVD_IRQHandler      
+   .thumb_set PVD_IRQHandler,Default_Handler
+               
+   .weak      TAMP_STAMP_IRQHandler            
+   .thumb_set TAMP_STAMP_IRQHandler,Default_Handler
+            
+   .weak      RTC_WKUP_IRQHandler                  
+   .thumb_set RTC_WKUP_IRQHandler,Default_Handler
+            
+   .weak      FLASH_IRQHandler         
+   .thumb_set FLASH_IRQHandler,Default_Handler
+                  
+   .weak      RCC_IRQHandler      
+   .thumb_set RCC_IRQHandler,Default_Handler
+                  
+   .weak      EXTI0_IRQHandler         
+   .thumb_set EXTI0_IRQHandler,Default_Handler
+                  
+   .weak      EXTI1_IRQHandler         
+   .thumb_set EXTI1_IRQHandler,Default_Handler
+                     
+   .weak      EXTI2_IRQHandler         
+   .thumb_set EXTI2_IRQHandler,Default_Handler 
+                 
+   .weak      EXTI3_IRQHandler         
+   .thumb_set EXTI3_IRQHandler,Default_Handler
+                        
+   .weak      EXTI4_IRQHandler         
+   .thumb_set EXTI4_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream0_IRQHandler               
+   .thumb_set DMA1_Stream0_IRQHandler,Default_Handler
+         
+   .weak      DMA1_Stream1_IRQHandler               
+   .thumb_set DMA1_Stream1_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream2_IRQHandler               
+   .thumb_set DMA1_Stream2_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream3_IRQHandler               
+   .thumb_set DMA1_Stream3_IRQHandler,Default_Handler 
+                 
+   .weak      DMA1_Stream4_IRQHandler              
+   .thumb_set DMA1_Stream4_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream5_IRQHandler               
+   .thumb_set DMA1_Stream5_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream6_IRQHandler               
+   .thumb_set DMA1_Stream6_IRQHandler,Default_Handler
+                  
+   .weak      ADC_IRQHandler      
+   .thumb_set ADC_IRQHandler,Default_Handler
+            
+   .weak      EXTI9_5_IRQHandler   
+   .thumb_set EXTI9_5_IRQHandler,Default_Handler
+            
+   .weak      TIM1_BRK_TIM9_IRQHandler            
+   .thumb_set TIM1_BRK_TIM9_IRQHandler,Default_Handler
+            
+   .weak      TIM1_UP_TIM10_IRQHandler            
+   .thumb_set TIM1_UP_TIM10_IRQHandler,Default_Handler
+      
+   .weak      TIM1_TRG_COM_TIM11_IRQHandler      
+   .thumb_set TIM1_TRG_COM_TIM11_IRQHandler,Default_Handler
+      
+   .weak      TIM1_CC_IRQHandler   
+   .thumb_set TIM1_CC_IRQHandler,Default_Handler
+                  
+   .weak      TIM2_IRQHandler            
+   .thumb_set TIM2_IRQHandler,Default_Handler
+                  
+   .weak      TIM3_IRQHandler            
+   .thumb_set TIM3_IRQHandler,Default_Handler
+                  
+   .weak      TIM4_IRQHandler            
+   .thumb_set TIM4_IRQHandler,Default_Handler
+                  
+   .weak      I2C1_EV_IRQHandler   
+   .thumb_set I2C1_EV_IRQHandler,Default_Handler
+                     
+   .weak      I2C1_ER_IRQHandler   
+   .thumb_set I2C1_ER_IRQHandler,Default_Handler
+                     
+   .weak      I2C2_EV_IRQHandler   
+   .thumb_set I2C2_EV_IRQHandler,Default_Handler
+                  
+   .weak      I2C2_ER_IRQHandler   
+   .thumb_set I2C2_ER_IRQHandler,Default_Handler
+                           
+   .weak      SPI1_IRQHandler            
+   .thumb_set SPI1_IRQHandler,Default_Handler
+                        
+   .weak      SPI2_IRQHandler            
+   .thumb_set SPI2_IRQHandler,Default_Handler
+                  
+   .weak      USART1_IRQHandler      
+   .thumb_set USART1_IRQHandler,Default_Handler
+                     
+   .weak      USART2_IRQHandler      
+   .thumb_set USART2_IRQHandler,Default_Handler
+                                  
+   .weak      EXTI15_10_IRQHandler               
+   .thumb_set EXTI15_10_IRQHandler,Default_Handler
+               
+   .weak      RTC_Alarm_IRQHandler               
+   .thumb_set RTC_Alarm_IRQHandler,Default_Handler
+            
+   .weak      OTG_FS_WKUP_IRQHandler         
+   .thumb_set OTG_FS_WKUP_IRQHandler,Default_Handler
+            
+   .weak      DMA1_Stream7_IRQHandler               
+   .thumb_set DMA1_Stream7_IRQHandler,Default_Handler
+                     
+   .weak      SDIO_IRQHandler            
+   .thumb_set SDIO_IRQHandler,Default_Handler
+                     
+   .weak      TIM5_IRQHandler            
+   .thumb_set TIM5_IRQHandler,Default_Handler
+                     
+   .weak      SPI3_IRQHandler            
+   .thumb_set SPI3_IRQHandler,Default_Handler
+                     
+   .weak      DMA2_Stream0_IRQHandler               
+   .thumb_set DMA2_Stream0_IRQHandler,Default_Handler
+               
+   .weak      DMA2_Stream1_IRQHandler               
+   .thumb_set DMA2_Stream1_IRQHandler,Default_Handler
+                  
+   .weak      DMA2_Stream2_IRQHandler               
+   .thumb_set DMA2_Stream2_IRQHandler,Default_Handler
+            
+   .weak      DMA2_Stream3_IRQHandler               
+   .thumb_set DMA2_Stream3_IRQHandler,Default_Handler
+            
+   .weak      DMA2_Stream4_IRQHandler               
+   .thumb_set DMA2_Stream4_IRQHandler,Default_Handler
+            
+   .weak      OTG_FS_IRQHandler      
+   .thumb_set OTG_FS_IRQHandler,Default_Handler
+                     
+   .weak      DMA2_Stream5_IRQHandler               
+   .thumb_set DMA2_Stream5_IRQHandler,Default_Handler
+                  
+   .weak      DMA2_Stream6_IRQHandler               
+   .thumb_set DMA2_Stream6_IRQHandler,Default_Handler
+                  
+   .weak      DMA2_Stream7_IRQHandler               
+   .thumb_set DMA2_Stream7_IRQHandler,Default_Handler
+                  
+   .weak      USART6_IRQHandler      
+   .thumb_set USART6_IRQHandler,Default_Handler
+                        
+   .weak      I2C3_EV_IRQHandler   
+   .thumb_set I2C3_EV_IRQHandler,Default_Handler
+                        
+   .weak      I2C3_ER_IRQHandler   
+   .thumb_set I2C3_ER_IRQHandler,Default_Handler
+                        
+   .weak      FPU_IRQHandler                  
+   .thumb_set FPU_IRQHandler,Default_Handler  
+
+   .weak      SPI4_IRQHandler                  
+   .thumb_set SPI4_IRQHandler,Default_Handler 
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
+
diff --git a/ports/stm/boards/startup_stm32f405xx.s b/ports/stm/boards/startup_stm32f405xx.s
new file mode 100644
index 000000000..6b77655ca
--- /dev/null
+++ b/ports/stm/boards/startup_stm32f405xx.s
@@ -0,0 +1,516 @@
+/**
+  ******************************************************************************
+  * @file      startup_stm32f405xx.s
+  * @author    MCD Application Team
+  * @brief     STM32F405xx Devices vector table for GCC based toolchains. 
+  *            This module performs:
+  *                - Set the initial SP
+  *                - Set the initial PC == Reset_Handler,
+  *                - Set the vector table entries with the exceptions ISR address
+  *                - Branches to main in the C library (which eventually
+  *                  calls main()).
+  *            After Reset the Cortex-M4 processor is in Thread mode,
+  *            priority is Privileged, and the Stack is set to Main.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT 2017 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+    
+  .syntax unified
+  .cpu cortex-m4
+  .fpu softvfp
+  .thumb
+
+.global  g_pfnVectors
+.global  Default_Handler
+
+/* start address for the initialization values of the .data section. 
+defined in linker script */
+.word  _sidata
+/* start address for the .data section. defined in linker script */  
+.word  _sdata
+/* end address for the .data section. defined in linker script */
+.word  _edata
+/* start address for the .bss section. defined in linker script */
+.word  _sbss
+/* end address for the .bss section. defined in linker script */
+.word  _ebss
+/* stack used for SystemInit_ExtMemCtl; always internal RAM used */
+
+/**
+ * @brief  This is the code that gets called when the processor first
+ *          starts execution following a reset event. Only the absolutely
+ *          necessary set is performed, after which the application
+ *          supplied main() routine is called. 
+ * @param  None
+ * @retval : None
+*/
+
+    .section  .text.Reset_Handler
+  .weak  Reset_Handler
+  .type  Reset_Handler, %function
+Reset_Handler:  
+  ldr   sp, =_estack     /* set stack pointer */
+
+/* Copy the data segment initializers from flash to SRAM */  
+  movs  r1, #0
+  b  LoopCopyDataInit
+
+CopyDataInit:
+  ldr  r3, =_sidata
+  ldr  r3, [r3, r1]
+  str  r3, [r0, r1]
+  adds  r1, r1, #4
+    
+LoopCopyDataInit:
+  ldr  r0, =_sdata
+  ldr  r3, =_edata
+  adds  r2, r0, r1
+  cmp  r2, r3
+  bcc  CopyDataInit
+  ldr  r2, =_sbss
+  b  LoopFillZerobss
+/* Zero fill the bss segment. */  
+FillZerobss:
+  movs  r3, #0
+  str  r3, [r2], #4
+    
+LoopFillZerobss:
+  ldr  r3, = _ebss
+  cmp  r2, r3
+  bcc  FillZerobss
+
+/* Call the clock system intitialization function.*/
+  bl  SystemInit   
+/* Call static constructors */
+/*    bl __libc_init_array */
+/* Call the application's entry point.*/
+  bl  main
+  bx  lr    
+.size  Reset_Handler, .-Reset_Handler
+
+/**
+ * @brief  This is the code that gets called when the processor receives an 
+ *         unexpected interrupt.  This simply enters an infinite loop, preserving
+ *         the system state for examination by a debugger.
+ * @param  None     
+ * @retval None       
+*/
+    .section  .text.Default_Handler,"ax",%progbits
+Default_Handler:
+Infinite_Loop:
+  b  Infinite_Loop
+  .size  Default_Handler, .-Default_Handler
+/******************************************************************************
+*
+* The minimal vector table for a Cortex M3. Note that the proper constructs
+* must be placed on this to ensure that it ends up at physical address
+* 0x0000.0000.
+* 
+*******************************************************************************/
+   .section  .isr_vector,"a",%progbits
+  .type  g_pfnVectors, %object
+  .size  g_pfnVectors, .-g_pfnVectors
+    
+
+	
+g_pfnVectors:
+  .word  _estack
+  .word  Reset_Handler
+
+  .word  NMI_Handler
+  .word  HardFault_Handler
+  .word  MemManage_Handler
+  .word  BusFault_Handler
+  .word  UsageFault_Handler
+  .word  0
+  .word  0
+  .word  0
+  .word  0
+  .word  SVC_Handler
+  .word  DebugMon_Handler
+  .word  0
+  .word  PendSV_Handler
+  .word  SysTick_Handler
+  
+  /* External Interrupts */
+  .word     WWDG_IRQHandler                   /* Window WatchDog              */                                        
+  .word     PVD_IRQHandler                    /* PVD through EXTI Line detection */                        
+  .word     TAMP_STAMP_IRQHandler             /* Tamper and TimeStamps through the EXTI line */            
+  .word     RTC_WKUP_IRQHandler               /* RTC Wakeup through the EXTI line */                      
+  .word     FLASH_IRQHandler                  /* FLASH                        */                                          
+  .word     RCC_IRQHandler                    /* RCC                          */                                            
+  .word     EXTI0_IRQHandler                  /* EXTI Line0                   */                        
+  .word     EXTI1_IRQHandler                  /* EXTI Line1                   */                          
+  .word     EXTI2_IRQHandler                  /* EXTI Line2                   */                          
+  .word     EXTI3_IRQHandler                  /* EXTI Line3                   */                          
+  .word     EXTI4_IRQHandler                  /* EXTI Line4                   */                          
+  .word     DMA1_Stream0_IRQHandler           /* DMA1 Stream 0                */                  
+  .word     DMA1_Stream1_IRQHandler           /* DMA1 Stream 1                */                   
+  .word     DMA1_Stream2_IRQHandler           /* DMA1 Stream 2                */                   
+  .word     DMA1_Stream3_IRQHandler           /* DMA1 Stream 3                */                   
+  .word     DMA1_Stream4_IRQHandler           /* DMA1 Stream 4                */                   
+  .word     DMA1_Stream5_IRQHandler           /* DMA1 Stream 5                */                   
+  .word     DMA1_Stream6_IRQHandler           /* DMA1 Stream 6                */                   
+  .word     ADC_IRQHandler                    /* ADC1, ADC2 and ADC3s         */                   
+  .word     CAN1_TX_IRQHandler                /* CAN1 TX                      */                         
+  .word     CAN1_RX0_IRQHandler               /* CAN1 RX0                     */                          
+  .word     CAN1_RX1_IRQHandler               /* CAN1 RX1                     */                          
+  .word     CAN1_SCE_IRQHandler               /* CAN1 SCE                     */                          
+  .word     EXTI9_5_IRQHandler                /* External Line[9:5]s          */                          
+  .word     TIM1_BRK_TIM9_IRQHandler          /* TIM1 Break and TIM9          */         
+  .word     TIM1_UP_TIM10_IRQHandler          /* TIM1 Update and TIM10        */         
+  .word     TIM1_TRG_COM_TIM11_IRQHandler     /* TIM1 Trigger and Commutation and TIM11 */
+  .word     TIM1_CC_IRQHandler                /* TIM1 Capture Compare         */                          
+  .word     TIM2_IRQHandler                   /* TIM2                         */                   
+  .word     TIM3_IRQHandler                   /* TIM3                         */                   
+  .word     TIM4_IRQHandler                   /* TIM4                         */                   
+  .word     I2C1_EV_IRQHandler                /* I2C1 Event                   */                          
+  .word     I2C1_ER_IRQHandler                /* I2C1 Error                   */                          
+  .word     I2C2_EV_IRQHandler                /* I2C2 Event                   */                          
+  .word     I2C2_ER_IRQHandler                /* I2C2 Error                   */                            
+  .word     SPI1_IRQHandler                   /* SPI1                         */                   
+  .word     SPI2_IRQHandler                   /* SPI2                         */                   
+  .word     USART1_IRQHandler                 /* USART1                       */                   
+  .word     USART2_IRQHandler                 /* USART2                       */                   
+  .word     USART3_IRQHandler                 /* USART3                       */                   
+  .word     EXTI15_10_IRQHandler              /* External Line[15:10]s        */                          
+  .word     RTC_Alarm_IRQHandler              /* RTC Alarm (A and B) through EXTI Line */                 
+  .word     OTG_FS_WKUP_IRQHandler            /* USB OTG FS Wakeup through EXTI line */                       
+  .word     TIM8_BRK_TIM12_IRQHandler         /* TIM8 Break and TIM12         */         
+  .word     TIM8_UP_TIM13_IRQHandler          /* TIM8 Update and TIM13        */         
+  .word     TIM8_TRG_COM_TIM14_IRQHandler     /* TIM8 Trigger and Commutation and TIM14 */
+  .word     TIM8_CC_IRQHandler                /* TIM8 Capture Compare         */                          
+  .word     DMA1_Stream7_IRQHandler           /* DMA1 Stream7                 */                          
+  .word     FSMC_IRQHandler                   /* FSMC                         */                   
+  .word     SDIO_IRQHandler                   /* SDIO                         */                   
+  .word     TIM5_IRQHandler                   /* TIM5                         */                   
+  .word     SPI3_IRQHandler                   /* SPI3                         */                   
+  .word     UART4_IRQHandler                  /* UART4                        */                   
+  .word     UART5_IRQHandler                  /* UART5                        */                   
+  .word     TIM6_DAC_IRQHandler               /* TIM6 and DAC1&2 underrun errors */                   
+  .word     TIM7_IRQHandler                   /* TIM7                         */
+  .word     DMA2_Stream0_IRQHandler           /* DMA2 Stream 0                */                   
+  .word     DMA2_Stream1_IRQHandler           /* DMA2 Stream 1                */                   
+  .word     DMA2_Stream2_IRQHandler           /* DMA2 Stream 2                */                   
+  .word     DMA2_Stream3_IRQHandler           /* DMA2 Stream 3                */                   
+  .word     DMA2_Stream4_IRQHandler           /* DMA2 Stream 4                */                   
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */                     
+  .word     CAN2_TX_IRQHandler                /* CAN2 TX                      */                          
+  .word     CAN2_RX0_IRQHandler               /* CAN2 RX0                     */                          
+  .word     CAN2_RX1_IRQHandler               /* CAN2 RX1                     */                          
+  .word     CAN2_SCE_IRQHandler               /* CAN2 SCE                     */                          
+  .word     OTG_FS_IRQHandler                 /* USB OTG FS                   */                   
+  .word     DMA2_Stream5_IRQHandler           /* DMA2 Stream 5                */                   
+  .word     DMA2_Stream6_IRQHandler           /* DMA2 Stream 6                */                   
+  .word     DMA2_Stream7_IRQHandler           /* DMA2 Stream 7                */                   
+  .word     USART6_IRQHandler                 /* USART6                       */                    
+  .word     I2C3_EV_IRQHandler                /* I2C3 event                   */                          
+  .word     I2C3_ER_IRQHandler                /* I2C3 error                   */                          
+  .word     OTG_HS_EP1_OUT_IRQHandler         /* USB OTG HS End Point 1 Out   */                   
+  .word     OTG_HS_EP1_IN_IRQHandler          /* USB OTG HS End Point 1 In    */                   
+  .word     OTG_HS_WKUP_IRQHandler            /* USB OTG HS Wakeup through EXTI */                         
+  .word     OTG_HS_IRQHandler                 /* USB OTG HS                   */                   
+  .word     0                                 /* Reserved                         */                   
+  .word     0                                 /* Reserved                  */                   
+  .word     HASH_RNG_IRQHandler               /* Hash and Rng                 */
+  .word     FPU_IRQHandler                    /* FPU                          */
+
+                      
+/*******************************************************************************
+*
+* Provide weak aliases for each Exception handler to the Default_Handler. 
+* As they are weak aliases, any function with the same name will override 
+* this definition.
+* 
+*******************************************************************************/
+   .weak      NMI_Handler
+   .thumb_set NMI_Handler,Default_Handler
+  
+   .weak      HardFault_Handler
+   .thumb_set HardFault_Handler,Default_Handler
+  
+   .weak      MemManage_Handler
+   .thumb_set MemManage_Handler,Default_Handler
+  
+   .weak      BusFault_Handler
+   .thumb_set BusFault_Handler,Default_Handler
+
+   .weak      UsageFault_Handler
+   .thumb_set UsageFault_Handler,Default_Handler
+
+   .weak      SVC_Handler
+   .thumb_set SVC_Handler,Default_Handler
+
+   .weak      DebugMon_Handler
+   .thumb_set DebugMon_Handler,Default_Handler
+
+   .weak      PendSV_Handler
+   .thumb_set PendSV_Handler,Default_Handler
+
+   .weak      SysTick_Handler
+   .thumb_set SysTick_Handler,Default_Handler              
+  
+   .weak      WWDG_IRQHandler                   
+   .thumb_set WWDG_IRQHandler,Default_Handler      
+                  
+   .weak      PVD_IRQHandler      
+   .thumb_set PVD_IRQHandler,Default_Handler
+               
+   .weak      TAMP_STAMP_IRQHandler            
+   .thumb_set TAMP_STAMP_IRQHandler,Default_Handler
+            
+   .weak      RTC_WKUP_IRQHandler                  
+   .thumb_set RTC_WKUP_IRQHandler,Default_Handler
+            
+   .weak      FLASH_IRQHandler         
+   .thumb_set FLASH_IRQHandler,Default_Handler
+                  
+   .weak      RCC_IRQHandler      
+   .thumb_set RCC_IRQHandler,Default_Handler
+                  
+   .weak      EXTI0_IRQHandler         
+   .thumb_set EXTI0_IRQHandler,Default_Handler
+                  
+   .weak      EXTI1_IRQHandler         
+   .thumb_set EXTI1_IRQHandler,Default_Handler
+                     
+   .weak      EXTI2_IRQHandler         
+   .thumb_set EXTI2_IRQHandler,Default_Handler 
+                 
+   .weak      EXTI3_IRQHandler         
+   .thumb_set EXTI3_IRQHandler,Default_Handler
+                        
+   .weak      EXTI4_IRQHandler         
+   .thumb_set EXTI4_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream0_IRQHandler               
+   .thumb_set DMA1_Stream0_IRQHandler,Default_Handler
+         
+   .weak      DMA1_Stream1_IRQHandler               
+   .thumb_set DMA1_Stream1_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream2_IRQHandler               
+   .thumb_set DMA1_Stream2_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream3_IRQHandler               
+   .thumb_set DMA1_Stream3_IRQHandler,Default_Handler 
+                 
+   .weak      DMA1_Stream4_IRQHandler              
+   .thumb_set DMA1_Stream4_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream5_IRQHandler               
+   .thumb_set DMA1_Stream5_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream6_IRQHandler               
+   .thumb_set DMA1_Stream6_IRQHandler,Default_Handler
+                  
+   .weak      ADC_IRQHandler      
+   .thumb_set ADC_IRQHandler,Default_Handler
+               
+   .weak      CAN1_TX_IRQHandler   
+   .thumb_set CAN1_TX_IRQHandler,Default_Handler
+            
+   .weak      CAN1_RX0_IRQHandler                  
+   .thumb_set CAN1_RX0_IRQHandler,Default_Handler
+                           
+   .weak      CAN1_RX1_IRQHandler                  
+   .thumb_set CAN1_RX1_IRQHandler,Default_Handler
+            
+   .weak      CAN1_SCE_IRQHandler                  
+   .thumb_set CAN1_SCE_IRQHandler,Default_Handler
+            
+   .weak      EXTI9_5_IRQHandler   
+   .thumb_set EXTI9_5_IRQHandler,Default_Handler
+            
+   .weak      TIM1_BRK_TIM9_IRQHandler            
+   .thumb_set TIM1_BRK_TIM9_IRQHandler,Default_Handler
+            
+   .weak      TIM1_UP_TIM10_IRQHandler            
+   .thumb_set TIM1_UP_TIM10_IRQHandler,Default_Handler
+      
+   .weak      TIM1_TRG_COM_TIM11_IRQHandler      
+   .thumb_set TIM1_TRG_COM_TIM11_IRQHandler,Default_Handler
+      
+   .weak      TIM1_CC_IRQHandler   
+   .thumb_set TIM1_CC_IRQHandler,Default_Handler
+                  
+   .weak      TIM2_IRQHandler            
+   .thumb_set TIM2_IRQHandler,Default_Handler
+                  
+   .weak      TIM3_IRQHandler            
+   .thumb_set TIM3_IRQHandler,Default_Handler
+                  
+   .weak      TIM4_IRQHandler            
+   .thumb_set TIM4_IRQHandler,Default_Handler
+                  
+   .weak      I2C1_EV_IRQHandler   
+   .thumb_set I2C1_EV_IRQHandler,Default_Handler
+                     
+   .weak      I2C1_ER_IRQHandler   
+   .thumb_set I2C1_ER_IRQHandler,Default_Handler
+                     
+   .weak      I2C2_EV_IRQHandler   
+   .thumb_set I2C2_EV_IRQHandler,Default_Handler
+                  
+   .weak      I2C2_ER_IRQHandler   
+   .thumb_set I2C2_ER_IRQHandler,Default_Handler
+                           
+   .weak      SPI1_IRQHandler            
+   .thumb_set SPI1_IRQHandler,Default_Handler
+                        
+   .weak      SPI2_IRQHandler            
+   .thumb_set SPI2_IRQHandler,Default_Handler
+                  
+   .weak      USART1_IRQHandler      
+   .thumb_set USART1_IRQHandler,Default_Handler
+                     
+   .weak      USART2_IRQHandler      
+   .thumb_set USART2_IRQHandler,Default_Handler
+                     
+   .weak      USART3_IRQHandler      
+   .thumb_set USART3_IRQHandler,Default_Handler
+                  
+   .weak      EXTI15_10_IRQHandler               
+   .thumb_set EXTI15_10_IRQHandler,Default_Handler
+               
+   .weak      RTC_Alarm_IRQHandler               
+   .thumb_set RTC_Alarm_IRQHandler,Default_Handler
+            
+   .weak      OTG_FS_WKUP_IRQHandler         
+   .thumb_set OTG_FS_WKUP_IRQHandler,Default_Handler
+            
+   .weak      TIM8_BRK_TIM12_IRQHandler         
+   .thumb_set TIM8_BRK_TIM12_IRQHandler,Default_Handler
+         
+   .weak      TIM8_UP_TIM13_IRQHandler            
+   .thumb_set TIM8_UP_TIM13_IRQHandler,Default_Handler
+         
+   .weak      TIM8_TRG_COM_TIM14_IRQHandler      
+   .thumb_set TIM8_TRG_COM_TIM14_IRQHandler,Default_Handler
+      
+   .weak      TIM8_CC_IRQHandler   
+   .thumb_set TIM8_CC_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream7_IRQHandler               
+   .thumb_set DMA1_Stream7_IRQHandler,Default_Handler
+                     
+   .weak      FSMC_IRQHandler            
+   .thumb_set FSMC_IRQHandler,Default_Handler
+                     
+   .weak      SDIO_IRQHandler            
+   .thumb_set SDIO_IRQHandler,Default_Handler
+                     
+   .weak      TIM5_IRQHandler            
+   .thumb_set TIM5_IRQHandler,Default_Handler
+                     
+   .weak      SPI3_IRQHandler            
+   .thumb_set SPI3_IRQHandler,Default_Handler
+                     
+   .weak      UART4_IRQHandler         
+   .thumb_set UART4_IRQHandler,Default_Handler
+                  
+   .weak      UART5_IRQHandler         
+   .thumb_set UART5_IRQHandler,Default_Handler
+                  
+   .weak      TIM6_DAC_IRQHandler                  
+   .thumb_set TIM6_DAC_IRQHandler,Default_Handler
+               
+   .weak      TIM7_IRQHandler            
+   .thumb_set TIM7_IRQHandler,Default_Handler
+         
+   .weak      DMA2_Stream0_IRQHandler               
+   .thumb_set DMA2_Stream0_IRQHandler,Default_Handler
+               
+   .weak      DMA2_Stream1_IRQHandler               
+   .thumb_set DMA2_Stream1_IRQHandler,Default_Handler
+                  
+   .weak      DMA2_Stream2_IRQHandler               
+   .thumb_set DMA2_Stream2_IRQHandler,Default_Handler
+            
+   .weak      DMA2_Stream3_IRQHandler               
+   .thumb_set DMA2_Stream3_IRQHandler,Default_Handler
+            
+   .weak      DMA2_Stream4_IRQHandler               
+   .thumb_set DMA2_Stream4_IRQHandler,Default_Handler
+            
+   .weak      CAN2_TX_IRQHandler   
+   .thumb_set CAN2_TX_IRQHandler,Default_Handler
+                           
+   .weak      CAN2_RX0_IRQHandler                  
+   .thumb_set CAN2_RX0_IRQHandler,Default_Handler
+                           
+   .weak      CAN2_RX1_IRQHandler                  
+   .thumb_set CAN2_RX1_IRQHandler,Default_Handler
+                           
+   .weak      CAN2_SCE_IRQHandler                  
+   .thumb_set CAN2_SCE_IRQHandler,Default_Handler
+                           
+   .weak      OTG_FS_IRQHandler      
+   .thumb_set OTG_FS_IRQHandler,Default_Handler
+                     
+   .weak      DMA2_Stream5_IRQHandler               
+   .thumb_set DMA2_Stream5_IRQHandler,Default_Handler
+                  
+   .weak      DMA2_Stream6_IRQHandler               
+   .thumb_set DMA2_Stream6_IRQHandler,Default_Handler
+                  
+   .weak      DMA2_Stream7_IRQHandler               
+   .thumb_set DMA2_Stream7_IRQHandler,Default_Handler
+                  
+   .weak      USART6_IRQHandler      
+   .thumb_set USART6_IRQHandler,Default_Handler
+                        
+   .weak      I2C3_EV_IRQHandler   
+   .thumb_set I2C3_EV_IRQHandler,Default_Handler
+                        
+   .weak      I2C3_ER_IRQHandler   
+   .thumb_set I2C3_ER_IRQHandler,Default_Handler
+                        
+   .weak      OTG_HS_EP1_OUT_IRQHandler         
+   .thumb_set OTG_HS_EP1_OUT_IRQHandler,Default_Handler
+               
+   .weak      OTG_HS_EP1_IN_IRQHandler            
+   .thumb_set OTG_HS_EP1_IN_IRQHandler,Default_Handler
+               
+   .weak      OTG_HS_WKUP_IRQHandler         
+   .thumb_set OTG_HS_WKUP_IRQHandler,Default_Handler
+            
+   .weak      OTG_HS_IRQHandler      
+   .thumb_set OTG_HS_IRQHandler,Default_Handler
+                                                     
+   .weak      HASH_RNG_IRQHandler                  
+   .thumb_set HASH_RNG_IRQHandler,Default_Handler   
+
+   .weak      FPU_IRQHandler                  
+   .thumb_set FPU_IRQHandler,Default_Handler  
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
+  
+
diff --git a/ports/stm/boards/startup_stm32f407xx.s b/ports/stm/boards/startup_stm32f407xx.s
new file mode 100644
index 000000000..6b77655ca
--- /dev/null
+++ b/ports/stm/boards/startup_stm32f407xx.s
@@ -0,0 +1,516 @@
+/**
+  ******************************************************************************
+  * @file      startup_stm32f405xx.s
+  * @author    MCD Application Team
+  * @brief     STM32F405xx Devices vector table for GCC based toolchains. 
+  *            This module performs:
+  *                - Set the initial SP
+  *                - Set the initial PC == Reset_Handler,
+  *                - Set the vector table entries with the exceptions ISR address
+  *                - Branches to main in the C library (which eventually
+  *                  calls main()).
+  *            After Reset the Cortex-M4 processor is in Thread mode,
+  *            priority is Privileged, and the Stack is set to Main.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT 2017 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+    
+  .syntax unified
+  .cpu cortex-m4
+  .fpu softvfp
+  .thumb
+
+.global  g_pfnVectors
+.global  Default_Handler
+
+/* start address for the initialization values of the .data section. 
+defined in linker script */
+.word  _sidata
+/* start address for the .data section. defined in linker script */  
+.word  _sdata
+/* end address for the .data section. defined in linker script */
+.word  _edata
+/* start address for the .bss section. defined in linker script */
+.word  _sbss
+/* end address for the .bss section. defined in linker script */
+.word  _ebss
+/* stack used for SystemInit_ExtMemCtl; always internal RAM used */
+
+/**
+ * @brief  This is the code that gets called when the processor first
+ *          starts execution following a reset event. Only the absolutely
+ *          necessary set is performed, after which the application
+ *          supplied main() routine is called. 
+ * @param  None
+ * @retval : None
+*/
+
+    .section  .text.Reset_Handler
+  .weak  Reset_Handler
+  .type  Reset_Handler, %function
+Reset_Handler:  
+  ldr   sp, =_estack     /* set stack pointer */
+
+/* Copy the data segment initializers from flash to SRAM */  
+  movs  r1, #0
+  b  LoopCopyDataInit
+
+CopyDataInit:
+  ldr  r3, =_sidata
+  ldr  r3, [r3, r1]
+  str  r3, [r0, r1]
+  adds  r1, r1, #4
+    
+LoopCopyDataInit:
+  ldr  r0, =_sdata
+  ldr  r3, =_edata
+  adds  r2, r0, r1
+  cmp  r2, r3
+  bcc  CopyDataInit
+  ldr  r2, =_sbss
+  b  LoopFillZerobss
+/* Zero fill the bss segment. */  
+FillZerobss:
+  movs  r3, #0
+  str  r3, [r2], #4
+    
+LoopFillZerobss:
+  ldr  r3, = _ebss
+  cmp  r2, r3
+  bcc  FillZerobss
+
+/* Call the clock system intitialization function.*/
+  bl  SystemInit   
+/* Call static constructors */
+/*    bl __libc_init_array */
+/* Call the application's entry point.*/
+  bl  main
+  bx  lr    
+.size  Reset_Handler, .-Reset_Handler
+
+/**
+ * @brief  This is the code that gets called when the processor receives an 
+ *         unexpected interrupt.  This simply enters an infinite loop, preserving
+ *         the system state for examination by a debugger.
+ * @param  None     
+ * @retval None       
+*/
+    .section  .text.Default_Handler,"ax",%progbits
+Default_Handler:
+Infinite_Loop:
+  b  Infinite_Loop
+  .size  Default_Handler, .-Default_Handler
+/******************************************************************************
+*
+* The minimal vector table for a Cortex M3. Note that the proper constructs
+* must be placed on this to ensure that it ends up at physical address
+* 0x0000.0000.
+* 
+*******************************************************************************/
+   .section  .isr_vector,"a",%progbits
+  .type  g_pfnVectors, %object
+  .size  g_pfnVectors, .-g_pfnVectors
+    
+
+	
+g_pfnVectors:
+  .word  _estack
+  .word  Reset_Handler
+
+  .word  NMI_Handler
+  .word  HardFault_Handler
+  .word  MemManage_Handler
+  .word  BusFault_Handler
+  .word  UsageFault_Handler
+  .word  0
+  .word  0
+  .word  0
+  .word  0
+  .word  SVC_Handler
+  .word  DebugMon_Handler
+  .word  0
+  .word  PendSV_Handler
+  .word  SysTick_Handler
+  
+  /* External Interrupts */
+  .word     WWDG_IRQHandler                   /* Window WatchDog              */                                        
+  .word     PVD_IRQHandler                    /* PVD through EXTI Line detection */                        
+  .word     TAMP_STAMP_IRQHandler             /* Tamper and TimeStamps through the EXTI line */            
+  .word     RTC_WKUP_IRQHandler               /* RTC Wakeup through the EXTI line */                      
+  .word     FLASH_IRQHandler                  /* FLASH                        */                                          
+  .word     RCC_IRQHandler                    /* RCC                          */                                            
+  .word     EXTI0_IRQHandler                  /* EXTI Line0                   */                        
+  .word     EXTI1_IRQHandler                  /* EXTI Line1                   */                          
+  .word     EXTI2_IRQHandler                  /* EXTI Line2                   */                          
+  .word     EXTI3_IRQHandler                  /* EXTI Line3                   */                          
+  .word     EXTI4_IRQHandler                  /* EXTI Line4                   */                          
+  .word     DMA1_Stream0_IRQHandler           /* DMA1 Stream 0                */                  
+  .word     DMA1_Stream1_IRQHandler           /* DMA1 Stream 1                */                   
+  .word     DMA1_Stream2_IRQHandler           /* DMA1 Stream 2                */                   
+  .word     DMA1_Stream3_IRQHandler           /* DMA1 Stream 3                */                   
+  .word     DMA1_Stream4_IRQHandler           /* DMA1 Stream 4                */                   
+  .word     DMA1_Stream5_IRQHandler           /* DMA1 Stream 5                */                   
+  .word     DMA1_Stream6_IRQHandler           /* DMA1 Stream 6                */                   
+  .word     ADC_IRQHandler                    /* ADC1, ADC2 and ADC3s         */                   
+  .word     CAN1_TX_IRQHandler                /* CAN1 TX                      */                         
+  .word     CAN1_RX0_IRQHandler               /* CAN1 RX0                     */                          
+  .word     CAN1_RX1_IRQHandler               /* CAN1 RX1                     */                          
+  .word     CAN1_SCE_IRQHandler               /* CAN1 SCE                     */                          
+  .word     EXTI9_5_IRQHandler                /* External Line[9:5]s          */                          
+  .word     TIM1_BRK_TIM9_IRQHandler          /* TIM1 Break and TIM9          */         
+  .word     TIM1_UP_TIM10_IRQHandler          /* TIM1 Update and TIM10        */         
+  .word     TIM1_TRG_COM_TIM11_IRQHandler     /* TIM1 Trigger and Commutation and TIM11 */
+  .word     TIM1_CC_IRQHandler                /* TIM1 Capture Compare         */                          
+  .word     TIM2_IRQHandler                   /* TIM2                         */                   
+  .word     TIM3_IRQHandler                   /* TIM3                         */                   
+  .word     TIM4_IRQHandler                   /* TIM4                         */                   
+  .word     I2C1_EV_IRQHandler                /* I2C1 Event                   */                          
+  .word     I2C1_ER_IRQHandler                /* I2C1 Error                   */                          
+  .word     I2C2_EV_IRQHandler                /* I2C2 Event                   */                          
+  .word     I2C2_ER_IRQHandler                /* I2C2 Error                   */                            
+  .word     SPI1_IRQHandler                   /* SPI1                         */                   
+  .word     SPI2_IRQHandler                   /* SPI2                         */                   
+  .word     USART1_IRQHandler                 /* USART1                       */                   
+  .word     USART2_IRQHandler                 /* USART2                       */                   
+  .word     USART3_IRQHandler                 /* USART3                       */                   
+  .word     EXTI15_10_IRQHandler              /* External Line[15:10]s        */                          
+  .word     RTC_Alarm_IRQHandler              /* RTC Alarm (A and B) through EXTI Line */                 
+  .word     OTG_FS_WKUP_IRQHandler            /* USB OTG FS Wakeup through EXTI line */                       
+  .word     TIM8_BRK_TIM12_IRQHandler         /* TIM8 Break and TIM12         */         
+  .word     TIM8_UP_TIM13_IRQHandler          /* TIM8 Update and TIM13        */         
+  .word     TIM8_TRG_COM_TIM14_IRQHandler     /* TIM8 Trigger and Commutation and TIM14 */
+  .word     TIM8_CC_IRQHandler                /* TIM8 Capture Compare         */                          
+  .word     DMA1_Stream7_IRQHandler           /* DMA1 Stream7                 */                          
+  .word     FSMC_IRQHandler                   /* FSMC                         */                   
+  .word     SDIO_IRQHandler                   /* SDIO                         */                   
+  .word     TIM5_IRQHandler                   /* TIM5                         */                   
+  .word     SPI3_IRQHandler                   /* SPI3                         */                   
+  .word     UART4_IRQHandler                  /* UART4                        */                   
+  .word     UART5_IRQHandler                  /* UART5                        */                   
+  .word     TIM6_DAC_IRQHandler               /* TIM6 and DAC1&2 underrun errors */                   
+  .word     TIM7_IRQHandler                   /* TIM7                         */
+  .word     DMA2_Stream0_IRQHandler           /* DMA2 Stream 0                */                   
+  .word     DMA2_Stream1_IRQHandler           /* DMA2 Stream 1                */                   
+  .word     DMA2_Stream2_IRQHandler           /* DMA2 Stream 2                */                   
+  .word     DMA2_Stream3_IRQHandler           /* DMA2 Stream 3                */                   
+  .word     DMA2_Stream4_IRQHandler           /* DMA2 Stream 4                */                   
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */                     
+  .word     CAN2_TX_IRQHandler                /* CAN2 TX                      */                          
+  .word     CAN2_RX0_IRQHandler               /* CAN2 RX0                     */                          
+  .word     CAN2_RX1_IRQHandler               /* CAN2 RX1                     */                          
+  .word     CAN2_SCE_IRQHandler               /* CAN2 SCE                     */                          
+  .word     OTG_FS_IRQHandler                 /* USB OTG FS                   */                   
+  .word     DMA2_Stream5_IRQHandler           /* DMA2 Stream 5                */                   
+  .word     DMA2_Stream6_IRQHandler           /* DMA2 Stream 6                */                   
+  .word     DMA2_Stream7_IRQHandler           /* DMA2 Stream 7                */                   
+  .word     USART6_IRQHandler                 /* USART6                       */                    
+  .word     I2C3_EV_IRQHandler                /* I2C3 event                   */                          
+  .word     I2C3_ER_IRQHandler                /* I2C3 error                   */                          
+  .word     OTG_HS_EP1_OUT_IRQHandler         /* USB OTG HS End Point 1 Out   */                   
+  .word     OTG_HS_EP1_IN_IRQHandler          /* USB OTG HS End Point 1 In    */                   
+  .word     OTG_HS_WKUP_IRQHandler            /* USB OTG HS Wakeup through EXTI */                         
+  .word     OTG_HS_IRQHandler                 /* USB OTG HS                   */                   
+  .word     0                                 /* Reserved                         */                   
+  .word     0                                 /* Reserved                  */                   
+  .word     HASH_RNG_IRQHandler               /* Hash and Rng                 */
+  .word     FPU_IRQHandler                    /* FPU                          */
+
+                      
+/*******************************************************************************
+*
+* Provide weak aliases for each Exception handler to the Default_Handler. 
+* As they are weak aliases, any function with the same name will override 
+* this definition.
+* 
+*******************************************************************************/
+   .weak      NMI_Handler
+   .thumb_set NMI_Handler,Default_Handler
+  
+   .weak      HardFault_Handler
+   .thumb_set HardFault_Handler,Default_Handler
+  
+   .weak      MemManage_Handler
+   .thumb_set MemManage_Handler,Default_Handler
+  
+   .weak      BusFault_Handler
+   .thumb_set BusFault_Handler,Default_Handler
+
+   .weak      UsageFault_Handler
+   .thumb_set UsageFault_Handler,Default_Handler
+
+   .weak      SVC_Handler
+   .thumb_set SVC_Handler,Default_Handler
+
+   .weak      DebugMon_Handler
+   .thumb_set DebugMon_Handler,Default_Handler
+
+   .weak      PendSV_Handler
+   .thumb_set PendSV_Handler,Default_Handler
+
+   .weak      SysTick_Handler
+   .thumb_set SysTick_Handler,Default_Handler              
+  
+   .weak      WWDG_IRQHandler                   
+   .thumb_set WWDG_IRQHandler,Default_Handler      
+                  
+   .weak      PVD_IRQHandler      
+   .thumb_set PVD_IRQHandler,Default_Handler
+               
+   .weak      TAMP_STAMP_IRQHandler            
+   .thumb_set TAMP_STAMP_IRQHandler,Default_Handler
+            
+   .weak      RTC_WKUP_IRQHandler                  
+   .thumb_set RTC_WKUP_IRQHandler,Default_Handler
+            
+   .weak      FLASH_IRQHandler         
+   .thumb_set FLASH_IRQHandler,Default_Handler
+                  
+   .weak      RCC_IRQHandler      
+   .thumb_set RCC_IRQHandler,Default_Handler
+                  
+   .weak      EXTI0_IRQHandler         
+   .thumb_set EXTI0_IRQHandler,Default_Handler
+                  
+   .weak      EXTI1_IRQHandler         
+   .thumb_set EXTI1_IRQHandler,Default_Handler
+                     
+   .weak      EXTI2_IRQHandler         
+   .thumb_set EXTI2_IRQHandler,Default_Handler 
+                 
+   .weak      EXTI3_IRQHandler         
+   .thumb_set EXTI3_IRQHandler,Default_Handler
+                        
+   .weak      EXTI4_IRQHandler         
+   .thumb_set EXTI4_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream0_IRQHandler               
+   .thumb_set DMA1_Stream0_IRQHandler,Default_Handler
+         
+   .weak      DMA1_Stream1_IRQHandler               
+   .thumb_set DMA1_Stream1_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream2_IRQHandler               
+   .thumb_set DMA1_Stream2_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream3_IRQHandler               
+   .thumb_set DMA1_Stream3_IRQHandler,Default_Handler 
+                 
+   .weak      DMA1_Stream4_IRQHandler              
+   .thumb_set DMA1_Stream4_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream5_IRQHandler               
+   .thumb_set DMA1_Stream5_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream6_IRQHandler               
+   .thumb_set DMA1_Stream6_IRQHandler,Default_Handler
+                  
+   .weak      ADC_IRQHandler      
+   .thumb_set ADC_IRQHandler,Default_Handler
+               
+   .weak      CAN1_TX_IRQHandler   
+   .thumb_set CAN1_TX_IRQHandler,Default_Handler
+            
+   .weak      CAN1_RX0_IRQHandler                  
+   .thumb_set CAN1_RX0_IRQHandler,Default_Handler
+                           
+   .weak      CAN1_RX1_IRQHandler                  
+   .thumb_set CAN1_RX1_IRQHandler,Default_Handler
+            
+   .weak      CAN1_SCE_IRQHandler                  
+   .thumb_set CAN1_SCE_IRQHandler,Default_Handler
+            
+   .weak      EXTI9_5_IRQHandler   
+   .thumb_set EXTI9_5_IRQHandler,Default_Handler
+            
+   .weak      TIM1_BRK_TIM9_IRQHandler            
+   .thumb_set TIM1_BRK_TIM9_IRQHandler,Default_Handler
+            
+   .weak      TIM1_UP_TIM10_IRQHandler            
+   .thumb_set TIM1_UP_TIM10_IRQHandler,Default_Handler
+      
+   .weak      TIM1_TRG_COM_TIM11_IRQHandler      
+   .thumb_set TIM1_TRG_COM_TIM11_IRQHandler,Default_Handler
+      
+   .weak      TIM1_CC_IRQHandler   
+   .thumb_set TIM1_CC_IRQHandler,Default_Handler
+                  
+   .weak      TIM2_IRQHandler            
+   .thumb_set TIM2_IRQHandler,Default_Handler
+                  
+   .weak      TIM3_IRQHandler            
+   .thumb_set TIM3_IRQHandler,Default_Handler
+                  
+   .weak      TIM4_IRQHandler            
+   .thumb_set TIM4_IRQHandler,Default_Handler
+                  
+   .weak      I2C1_EV_IRQHandler   
+   .thumb_set I2C1_EV_IRQHandler,Default_Handler
+                     
+   .weak      I2C1_ER_IRQHandler   
+   .thumb_set I2C1_ER_IRQHandler,Default_Handler
+                     
+   .weak      I2C2_EV_IRQHandler   
+   .thumb_set I2C2_EV_IRQHandler,Default_Handler
+                  
+   .weak      I2C2_ER_IRQHandler   
+   .thumb_set I2C2_ER_IRQHandler,Default_Handler
+                           
+   .weak      SPI1_IRQHandler            
+   .thumb_set SPI1_IRQHandler,Default_Handler
+                        
+   .weak      SPI2_IRQHandler            
+   .thumb_set SPI2_IRQHandler,Default_Handler
+                  
+   .weak      USART1_IRQHandler      
+   .thumb_set USART1_IRQHandler,Default_Handler
+                     
+   .weak      USART2_IRQHandler      
+   .thumb_set USART2_IRQHandler,Default_Handler
+                     
+   .weak      USART3_IRQHandler      
+   .thumb_set USART3_IRQHandler,Default_Handler
+                  
+   .weak      EXTI15_10_IRQHandler               
+   .thumb_set EXTI15_10_IRQHandler,Default_Handler
+               
+   .weak      RTC_Alarm_IRQHandler               
+   .thumb_set RTC_Alarm_IRQHandler,Default_Handler
+            
+   .weak      OTG_FS_WKUP_IRQHandler         
+   .thumb_set OTG_FS_WKUP_IRQHandler,Default_Handler
+            
+   .weak      TIM8_BRK_TIM12_IRQHandler         
+   .thumb_set TIM8_BRK_TIM12_IRQHandler,Default_Handler
+         
+   .weak      TIM8_UP_TIM13_IRQHandler            
+   .thumb_set TIM8_UP_TIM13_IRQHandler,Default_Handler
+         
+   .weak      TIM8_TRG_COM_TIM14_IRQHandler      
+   .thumb_set TIM8_TRG_COM_TIM14_IRQHandler,Default_Handler
+      
+   .weak      TIM8_CC_IRQHandler   
+   .thumb_set TIM8_CC_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream7_IRQHandler               
+   .thumb_set DMA1_Stream7_IRQHandler,Default_Handler
+                     
+   .weak      FSMC_IRQHandler            
+   .thumb_set FSMC_IRQHandler,Default_Handler
+                     
+   .weak      SDIO_IRQHandler            
+   .thumb_set SDIO_IRQHandler,Default_Handler
+                     
+   .weak      TIM5_IRQHandler            
+   .thumb_set TIM5_IRQHandler,Default_Handler
+                     
+   .weak      SPI3_IRQHandler            
+   .thumb_set SPI3_IRQHandler,Default_Handler
+                     
+   .weak      UART4_IRQHandler         
+   .thumb_set UART4_IRQHandler,Default_Handler
+                  
+   .weak      UART5_IRQHandler         
+   .thumb_set UART5_IRQHandler,Default_Handler
+                  
+   .weak      TIM6_DAC_IRQHandler                  
+   .thumb_set TIM6_DAC_IRQHandler,Default_Handler
+               
+   .weak      TIM7_IRQHandler            
+   .thumb_set TIM7_IRQHandler,Default_Handler
+         
+   .weak      DMA2_Stream0_IRQHandler               
+   .thumb_set DMA2_Stream0_IRQHandler,Default_Handler
+               
+   .weak      DMA2_Stream1_IRQHandler               
+   .thumb_set DMA2_Stream1_IRQHandler,Default_Handler
+                  
+   .weak      DMA2_Stream2_IRQHandler               
+   .thumb_set DMA2_Stream2_IRQHandler,Default_Handler
+            
+   .weak      DMA2_Stream3_IRQHandler               
+   .thumb_set DMA2_Stream3_IRQHandler,Default_Handler
+            
+   .weak      DMA2_Stream4_IRQHandler               
+   .thumb_set DMA2_Stream4_IRQHandler,Default_Handler
+            
+   .weak      CAN2_TX_IRQHandler   
+   .thumb_set CAN2_TX_IRQHandler,Default_Handler
+                           
+   .weak      CAN2_RX0_IRQHandler                  
+   .thumb_set CAN2_RX0_IRQHandler,Default_Handler
+                           
+   .weak      CAN2_RX1_IRQHandler                  
+   .thumb_set CAN2_RX1_IRQHandler,Default_Handler
+                           
+   .weak      CAN2_SCE_IRQHandler                  
+   .thumb_set CAN2_SCE_IRQHandler,Default_Handler
+                           
+   .weak      OTG_FS_IRQHandler      
+   .thumb_set OTG_FS_IRQHandler,Default_Handler
+                     
+   .weak      DMA2_Stream5_IRQHandler               
+   .thumb_set DMA2_Stream5_IRQHandler,Default_Handler
+                  
+   .weak      DMA2_Stream6_IRQHandler               
+   .thumb_set DMA2_Stream6_IRQHandler,Default_Handler
+                  
+   .weak      DMA2_Stream7_IRQHandler               
+   .thumb_set DMA2_Stream7_IRQHandler,Default_Handler
+                  
+   .weak      USART6_IRQHandler      
+   .thumb_set USART6_IRQHandler,Default_Handler
+                        
+   .weak      I2C3_EV_IRQHandler   
+   .thumb_set I2C3_EV_IRQHandler,Default_Handler
+                        
+   .weak      I2C3_ER_IRQHandler   
+   .thumb_set I2C3_ER_IRQHandler,Default_Handler
+                        
+   .weak      OTG_HS_EP1_OUT_IRQHandler         
+   .thumb_set OTG_HS_EP1_OUT_IRQHandler,Default_Handler
+               
+   .weak      OTG_HS_EP1_IN_IRQHandler            
+   .thumb_set OTG_HS_EP1_IN_IRQHandler,Default_Handler
+               
+   .weak      OTG_HS_WKUP_IRQHandler         
+   .thumb_set OTG_HS_WKUP_IRQHandler,Default_Handler
+            
+   .weak      OTG_HS_IRQHandler      
+   .thumb_set OTG_HS_IRQHandler,Default_Handler
+                                                     
+   .weak      HASH_RNG_IRQHandler                  
+   .thumb_set HASH_RNG_IRQHandler,Default_Handler   
+
+   .weak      FPU_IRQHandler                  
+   .thumb_set FPU_IRQHandler,Default_Handler  
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
+  
+
diff --git a/ports/stm/boards/startup_stm32f411xe.s b/ports/stm/boards/startup_stm32f411xe.s
new file mode 100644
index 000000000..3aac640cb
--- /dev/null
+++ b/ports/stm/boards/startup_stm32f411xe.s
@@ -0,0 +1,452 @@
+/**
+  ******************************************************************************
+  * @file      startup_stm32f411xe.s
+  * @author    MCD Application Team
+  * @brief     STM32F411xExx Devices vector table for GCC based toolchains. 
+  *            This module performs:
+  *                - Set the initial SP
+  *                - Set the initial PC == Reset_Handler,
+  *                - Set the vector table entries with the exceptions ISR address
+  *                - Branches to main in the C library (which eventually
+  *                  calls main()).
+  *            After Reset the Cortex-M4 processor is in Thread mode,
+  *            priority is Privileged, and the Stack is set to Main.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT 2017 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+    
+  .syntax unified
+  .cpu cortex-m4
+  .fpu softvfp
+  .thumb
+
+.global  g_pfnVectors
+.global  Default_Handler
+
+/* start address for the initialization values of the .data section. 
+defined in linker script */
+.word  _sidata
+/* start address for the .data section. defined in linker script */  
+.word  _sdata
+/* end address for the .data section. defined in linker script */
+.word  _edata
+/* start address for the .bss section. defined in linker script */
+.word  _sbss
+/* end address for the .bss section. defined in linker script */
+.word  _ebss
+/* stack used for SystemInit_ExtMemCtl; always internal RAM used */
+
+/**
+ * @brief  This is the code that gets called when the processor first
+ *          starts execution following a reset event. Only the absolutely
+ *          necessary set is performed, after which the application
+ *          supplied main() routine is called. 
+ * @param  None
+ * @retval : None
+*/
+
+    .section  .text.Reset_Handler
+  .weak  Reset_Handler
+  .type  Reset_Handler, %function
+Reset_Handler:  
+  ldr   sp, =_estack    		 /* set stack pointer */
+
+/* Copy the data segment initializers from flash to SRAM */  
+  movs  r1, #0
+  b  LoopCopyDataInit
+
+CopyDataInit:
+  ldr  r3, =_sidata
+  ldr  r3, [r3, r1]
+  str  r3, [r0, r1]
+  adds  r1, r1, #4
+    
+LoopCopyDataInit:
+  ldr  r0, =_sdata
+  ldr  r3, =_edata
+  adds  r2, r0, r1
+  cmp  r2, r3
+  bcc  CopyDataInit
+  ldr  r2, =_sbss
+  b  LoopFillZerobss
+/* Zero fill the bss segment. */  
+FillZerobss:
+  movs  r3, #0
+  str  r3, [r2], #4
+    
+LoopFillZerobss:
+  ldr  r3, = _ebss
+  cmp  r2, r3
+  bcc  FillZerobss
+
+/* Call the clock system intitialization function.*/
+  bl  SystemInit   
+/* Call static constructors */
+/*    bl __libc_init_array */
+/* Call the application's entry point.*/
+  bl  main
+  bx  lr    
+.size  Reset_Handler, .-Reset_Handler
+
+/**
+ * @brief  This is the code that gets called when the processor receives an 
+ *         unexpected interrupt.  This simply enters an infinite loop, preserving
+ *         the system state for examination by a debugger.
+ * @param  None     
+ * @retval None       
+*/
+    .section  .text.Default_Handler,"ax",%progbits
+Default_Handler:
+Infinite_Loop:
+  b  Infinite_Loop
+  .size  Default_Handler, .-Default_Handler
+/******************************************************************************
+*
+* The minimal vector table for a Cortex M3. Note that the proper constructs
+* must be placed on this to ensure that it ends up at physical address
+* 0x0000.0000.
+* 
+*******************************************************************************/
+   .section  .isr_vector,"a",%progbits
+  .type  g_pfnVectors, %object
+  .size  g_pfnVectors, .-g_pfnVectors
+    
+g_pfnVectors:
+  .word  _estack
+  .word  Reset_Handler
+  .word  NMI_Handler
+  .word  HardFault_Handler
+  .word  MemManage_Handler
+  .word  BusFault_Handler
+  .word  UsageFault_Handler
+  .word  0
+  .word  0
+  .word  0
+  .word  0
+  .word  SVC_Handler
+  .word  DebugMon_Handler
+  .word  0
+  .word  PendSV_Handler
+  .word  SysTick_Handler
+  
+  /* External Interrupts */
+  .word     WWDG_IRQHandler                   /* Window WatchDog              */                                        
+  .word     PVD_IRQHandler                    /* PVD through EXTI Line detection */                        
+  .word     TAMP_STAMP_IRQHandler             /* Tamper and TimeStamps through the EXTI line */            
+  .word     RTC_WKUP_IRQHandler               /* RTC Wakeup through the EXTI line */                      
+  .word     FLASH_IRQHandler                  /* FLASH                        */                                          
+  .word     RCC_IRQHandler                    /* RCC                          */                                            
+  .word     EXTI0_IRQHandler                  /* EXTI Line0                   */                        
+  .word     EXTI1_IRQHandler                  /* EXTI Line1                   */                          
+  .word     EXTI2_IRQHandler                  /* EXTI Line2                   */                          
+  .word     EXTI3_IRQHandler                  /* EXTI Line3                   */                          
+  .word     EXTI4_IRQHandler                  /* EXTI Line4                   */                          
+  .word     DMA1_Stream0_IRQHandler           /* DMA1 Stream 0                */                  
+  .word     DMA1_Stream1_IRQHandler           /* DMA1 Stream 1                */                   
+  .word     DMA1_Stream2_IRQHandler           /* DMA1 Stream 2                */                   
+  .word     DMA1_Stream3_IRQHandler           /* DMA1 Stream 3                */                   
+  .word     DMA1_Stream4_IRQHandler           /* DMA1 Stream 4                */                   
+  .word     DMA1_Stream5_IRQHandler           /* DMA1 Stream 5                */                   
+  .word     DMA1_Stream6_IRQHandler           /* DMA1 Stream 6                */                   
+  .word     ADC_IRQHandler                    /* ADC1, ADC2 and ADC3s         */                   
+  .word     0               				  /* Reserved                      */                         
+  .word     0              					  /* Reserved                     */                          
+  .word     0                                 /* Reserved                     */                          
+  .word     0                                 /* Reserved                     */                          
+  .word     EXTI9_5_IRQHandler                /* External Line[9:5]s          */                          
+  .word     TIM1_BRK_TIM9_IRQHandler          /* TIM1 Break and TIM9          */         
+  .word     TIM1_UP_TIM10_IRQHandler          /* TIM1 Update and TIM10        */         
+  .word     TIM1_TRG_COM_TIM11_IRQHandler     /* TIM1 Trigger and Commutation and TIM11 */
+  .word     TIM1_CC_IRQHandler                /* TIM1 Capture Compare         */                          
+  .word     TIM2_IRQHandler                   /* TIM2                         */                   
+  .word     TIM3_IRQHandler                   /* TIM3                         */                   
+  .word     TIM4_IRQHandler                   /* TIM4                         */                   
+  .word     I2C1_EV_IRQHandler                /* I2C1 Event                   */                          
+  .word     I2C1_ER_IRQHandler                /* I2C1 Error                   */                          
+  .word     I2C2_EV_IRQHandler                /* I2C2 Event                   */                          
+  .word     I2C2_ER_IRQHandler                /* I2C2 Error                   */                            
+  .word     SPI1_IRQHandler                   /* SPI1                         */                   
+  .word     SPI2_IRQHandler                   /* SPI2                         */                   
+  .word     USART1_IRQHandler                 /* USART1                       */                   
+  .word     USART2_IRQHandler                 /* USART2                       */                   
+  .word     0               				  /* Reserved                       */                   
+  .word     EXTI15_10_IRQHandler              /* External Line[15:10]s        */                          
+  .word     RTC_Alarm_IRQHandler              /* RTC Alarm (A and B) through EXTI Line */                 
+  .word     OTG_FS_WKUP_IRQHandler            /* USB OTG FS Wakeup through EXTI line */                       
+  .word     0                                 /* Reserved     				  */         
+  .word     0                                 /* Reserved       			  */         
+  .word     0                                 /* Reserved 					  */
+  .word     0                                 /* Reserved                     */                          
+  .word     DMA1_Stream7_IRQHandler           /* DMA1 Stream7                 */                          
+  .word     0                                 /* Reserved                     */                   
+  .word     SDIO_IRQHandler                   /* SDIO                         */                   
+  .word     TIM5_IRQHandler                   /* TIM5                         */                   
+  .word     SPI3_IRQHandler                   /* SPI3                         */                   
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */
+  .word     DMA2_Stream0_IRQHandler           /* DMA2 Stream 0                */                   
+  .word     DMA2_Stream1_IRQHandler           /* DMA2 Stream 1                */                   
+  .word     DMA2_Stream2_IRQHandler           /* DMA2 Stream 2                */                   
+  .word     DMA2_Stream3_IRQHandler           /* DMA2 Stream 3                */                   
+  .word     DMA2_Stream4_IRQHandler           /* DMA2 Stream 4                */                   
+  .word     0                    			  /* Reserved                     */                   
+  .word     0              					  /* Reserved                     */                     
+  .word     0              					  /* Reserved                     */                          
+  .word     0             					  /* Reserved                     */                          
+  .word     0              					  /* Reserved                     */                          
+  .word     0              					  /* Reserved                     */                          
+  .word     OTG_FS_IRQHandler                 /* USB OTG FS                   */                   
+  .word     DMA2_Stream5_IRQHandler           /* DMA2 Stream 5                */                   
+  .word     DMA2_Stream6_IRQHandler           /* DMA2 Stream 6                */                   
+  .word     DMA2_Stream7_IRQHandler           /* DMA2 Stream 7                */                   
+  .word     USART6_IRQHandler                 /* USART6                       */                    
+  .word     I2C3_EV_IRQHandler                /* I2C3 event                   */                          
+  .word     I2C3_ER_IRQHandler                /* I2C3 error                   */                          
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */                         
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */
+  .word     FPU_IRQHandler                    /* FPU                          */
+  .word     0                                 /* Reserved                     */                   
+  .word     0                                 /* Reserved                     */
+  .word     SPI4_IRQHandler                   /* SPI4                         */
+  .word     SPI5_IRQHandler                   /* SPI5                         */  
+                    
+/*******************************************************************************
+*
+* Provide weak aliases for each Exception handler to the Default_Handler. 
+* As they are weak aliases, any function with the same name will override 
+* this definition.
+* 
+*******************************************************************************/
+   .weak      NMI_Handler
+   .thumb_set NMI_Handler,Default_Handler
+  
+   .weak      HardFault_Handler
+   .thumb_set HardFault_Handler,Default_Handler
+  
+   .weak      MemManage_Handler
+   .thumb_set MemManage_Handler,Default_Handler
+  
+   .weak      BusFault_Handler
+   .thumb_set BusFault_Handler,Default_Handler
+
+   .weak      UsageFault_Handler
+   .thumb_set UsageFault_Handler,Default_Handler
+
+   .weak      SVC_Handler
+   .thumb_set SVC_Handler,Default_Handler
+
+   .weak      DebugMon_Handler
+   .thumb_set DebugMon_Handler,Default_Handler
+
+   .weak      PendSV_Handler
+   .thumb_set PendSV_Handler,Default_Handler
+
+   .weak      SysTick_Handler
+   .thumb_set SysTick_Handler,Default_Handler              
+  
+   .weak      WWDG_IRQHandler                   
+   .thumb_set WWDG_IRQHandler,Default_Handler      
+                  
+   .weak      PVD_IRQHandler      
+   .thumb_set PVD_IRQHandler,Default_Handler
+               
+   .weak      TAMP_STAMP_IRQHandler            
+   .thumb_set TAMP_STAMP_IRQHandler,Default_Handler
+            
+   .weak      RTC_WKUP_IRQHandler                  
+   .thumb_set RTC_WKUP_IRQHandler,Default_Handler
+            
+   .weak      FLASH_IRQHandler         
+   .thumb_set FLASH_IRQHandler,Default_Handler
+                  
+   .weak      RCC_IRQHandler      
+   .thumb_set RCC_IRQHandler,Default_Handler
+                  
+   .weak      EXTI0_IRQHandler         
+   .thumb_set EXTI0_IRQHandler,Default_Handler
+                  
+   .weak      EXTI1_IRQHandler         
+   .thumb_set EXTI1_IRQHandler,Default_Handler
+                     
+   .weak      EXTI2_IRQHandler         
+   .thumb_set EXTI2_IRQHandler,Default_Handler 
+                 
+   .weak      EXTI3_IRQHandler         
+   .thumb_set EXTI3_IRQHandler,Default_Handler
+                        
+   .weak      EXTI4_IRQHandler         
+   .thumb_set EXTI4_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream0_IRQHandler               
+   .thumb_set DMA1_Stream0_IRQHandler,Default_Handler
+         
+   .weak      DMA1_Stream1_IRQHandler               
+   .thumb_set DMA1_Stream1_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream2_IRQHandler               
+   .thumb_set DMA1_Stream2_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream3_IRQHandler               
+   .thumb_set DMA1_Stream3_IRQHandler,Default_Handler 
+                 
+   .weak      DMA1_Stream4_IRQHandler              
+   .thumb_set DMA1_Stream4_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream5_IRQHandler               
+   .thumb_set DMA1_Stream5_IRQHandler,Default_Handler
+                  
+   .weak      DMA1_Stream6_IRQHandler               
+   .thumb_set DMA1_Stream6_IRQHandler,Default_Handler
+                  
+   .weak      ADC_IRQHandler      
+   .thumb_set ADC_IRQHandler,Default_Handler
+            
+   .weak      EXTI9_5_IRQHandler   
+   .thumb_set EXTI9_5_IRQHandler,Default_Handler
+            
+   .weak      TIM1_BRK_TIM9_IRQHandler            
+   .thumb_set TIM1_BRK_TIM9_IRQHandler,Default_Handler
+            
+   .weak      TIM1_UP_TIM10_IRQHandler            
+   .thumb_set TIM1_UP_TIM10_IRQHandler,Default_Handler
+      
+   .weak      TIM1_TRG_COM_TIM11_IRQHandler      
+   .thumb_set TIM1_TRG_COM_TIM11_IRQHandler,Default_Handler
+      
+   .weak      TIM1_CC_IRQHandler   
+   .thumb_set TIM1_CC_IRQHandler,Default_Handler
+                  
+   .weak      TIM2_IRQHandler            
+   .thumb_set TIM2_IRQHandler,Default_Handler
+                  
+   .weak      TIM3_IRQHandler            
+   .thumb_set TIM3_IRQHandler,Default_Handler
+                  
+   .weak      TIM4_IRQHandler            
+   .thumb_set TIM4_IRQHandler,Default_Handler
+                  
+   .weak      I2C1_EV_IRQHandler   
+   .thumb_set I2C1_EV_IRQHandler,Default_Handler
+                     
+   .weak      I2C1_ER_IRQHandler   
+   .thumb_set I2C1_ER_IRQHandler,Default_Handler
+                     
+   .weak      I2C2_EV_IRQHandler   
+   .thumb_set I2C2_EV_IRQHandler,Default_Handler
+                  
+   .weak      I2C2_ER_IRQHandler   
+   .thumb_set I2C2_ER_IRQHandler,Default_Handler
+                           
+   .weak      SPI1_IRQHandler            
+   .thumb_set SPI1_IRQHandler,Default_Handler
+                        
+   .weak      SPI2_IRQHandler            
+   .thumb_set SPI2_IRQHandler,Default_Handler
+                  
+   .weak      USART1_IRQHandler      
+   .thumb_set USART1_IRQHandler,Default_Handler
+                     
+   .weak      USART2_IRQHandler      
+   .thumb_set USART2_IRQHandler,Default_Handler
+                                  
+   .weak      EXTI15_10_IRQHandler               
+   .thumb_set EXTI15_10_IRQHandler,Default_Handler
+               
+   .weak      RTC_Alarm_IRQHandler               
+   .thumb_set RTC_Alarm_IRQHandler,Default_Handler
+            
+   .weak      OTG_FS_WKUP_IRQHandler         
+   .thumb_set OTG_FS_WKUP_IRQHandler,Default_Handler
+            
+   .weak      DMA1_Stream7_IRQHandler               
+   .thumb_set DMA1_Stream7_IRQHandler,Default_Handler
+                     
+   .weak      SDIO_IRQHandler            
+   .thumb_set SDIO_IRQHandler,Default_Handler
+                     
+   .weak      TIM5_IRQHandler            
+   .thumb_set TIM5_IRQHandler,Default_Handler
+                     
+   .weak      SPI3_IRQHandler            
+   .thumb_set SPI3_IRQHandler,Default_Handler
+                     
+   .weak      DMA2_Stream0_IRQHandler               
+   .thumb_set DMA2_Stream0_IRQHandler,Default_Handler
+               
+   .weak      DMA2_Stream1_IRQHandler               
+   .thumb_set DMA2_Stream1_IRQHandler,Default_Handler
+                  
+   .weak      DMA2_Stream2_IRQHandler               
+   .thumb_set DMA2_Stream2_IRQHandler,Default_Handler
+            
+   .weak      DMA2_Stream3_IRQHandler               
+   .thumb_set DMA2_Stream3_IRQHandler,Default_Handler
+            
+   .weak      DMA2_Stream4_IRQHandler               
+   .thumb_set DMA2_Stream4_IRQHandler,Default_Handler
+            
+   .weak      OTG_FS_IRQHandler      
+   .thumb_set OTG_FS_IRQHandler,Default_Handler
+                     
+   .weak      DMA2_Stream5_IRQHandler               
+   .thumb_set DMA2_Stream5_IRQHandler,Default_Handler
+                  
+   .weak      DMA2_Stream6_IRQHandler               
+   .thumb_set DMA2_Stream6_IRQHandler,Default_Handler
+                  
+   .weak      DMA2_Stream7_IRQHandler               
+   .thumb_set DMA2_Stream7_IRQHandler,Default_Handler
+                  
+   .weak      USART6_IRQHandler      
+   .thumb_set USART6_IRQHandler,Default_Handler
+                        
+   .weak      I2C3_EV_IRQHandler   
+   .thumb_set I2C3_EV_IRQHandler,Default_Handler
+                        
+   .weak      I2C3_ER_IRQHandler   
+   .thumb_set I2C3_ER_IRQHandler,Default_Handler
+                        
+   .weak      FPU_IRQHandler                  
+   .thumb_set FPU_IRQHandler,Default_Handler  
+
+   .weak      SPI4_IRQHandler                  
+   .thumb_set SPI4_IRQHandler,Default_Handler
+
+   .weak      SPI5_IRQHandler                  
+   .thumb_set SPI5_IRQHandler,Default_Handler    
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
+
diff --git a/ports/stm/boards/startup_stm32f412zx.s b/ports/stm/boards/startup_stm32f412zx.s
new file mode 100644
index 000000000..801220795
--- /dev/null
+++ b/ports/stm/boards/startup_stm32f412zx.s
@@ -0,0 +1,524 @@
+/**
+  ******************************************************************************
+  * @file      startup_stm32f412zx.s
+  * @author    MCD Application Team
+  * @brief     STM32F412Zx Devices vector table for GCC based toolchains. 
+  *            This module performs:
+  *                - Set the initial SP
+  *                - Set the initial PC == Reset_Handler,
+  *                - Set the vector table entries with the exceptions ISR address
+  *                - Branches to main in the C library (which eventually
+  *                  calls main()).
+  *            After Reset the Cortex-M4 processor is in Thread mode,
+  *            priority is Privileged, and the Stack is set to Main.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT 2017 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+    
+  .syntax unified
+  .cpu cortex-m4
+  .fpu softvfp
+  .thumb
+
+.global  g_pfnVectors
+.global  Default_Handler
+
+/* start address for the initialization values of the .data section. 
+defined in linker script */
+.word  _sidata
+/* start address for the .data section. defined in linker script */
+.word  _sdata
+/* end address for the .data section. defined in linker script */
+.word  _edata
+/* start address for the .bss section. defined in linker script */
+.word  _sbss
+/* end address for the .bss section. defined in linker script */
+.word  _ebss
+/* stack used for SystemInit_ExtMemCtl; always internal RAM used */
+
+/**
+ * @brief  This is the code that gets called when the processor first
+ *          starts execution following a reset event. Only the absolutely
+ *          necessary set is performed, after which the application
+ *          supplied main() routine is called. 
+ * @param  None
+ * @retval : None
+*/
+
+    .section  .text.Reset_Handler
+  .weak  Reset_Handler
+  .type  Reset_Handler, %function
+Reset_Handler:  
+  ldr   sp, =_estack       /* set stack pointer */
+
+/* Copy the data segment initializers from flash to SRAM */
+  movs  r1, #0
+  b  LoopCopyDataInit
+
+CopyDataInit:
+  ldr  r3, =_sidata
+  ldr  r3, [r3, r1]
+  str  r3, [r0, r1]
+  adds  r1, r1, #4
+    
+LoopCopyDataInit:
+  ldr  r0, =_sdata
+  ldr  r3, =_edata
+  adds  r2, r0, r1
+  cmp  r2, r3
+  bcc  CopyDataInit
+  ldr  r2, =_sbss
+  b  LoopFillZerobss
+/* Zero fill the bss segment. */
+FillZerobss:
+  movs  r3, #0
+  str  r3, [r2], #4
+    
+LoopFillZerobss:
+  ldr  r3, = _ebss
+  cmp  r2, r3
+  bcc  FillZerobss
+
+/* Call the clock system intitialization function.*/
+  bl  SystemInit   
+/* Call static constructors */
+/*    bl __libc_init_array */
+/* Call the application's entry point.*/
+  bl  main
+  bx  lr    
+.size  Reset_Handler, .-Reset_Handler
+
+/**
+ * @brief  This is the code that gets called when the processor receives an 
+ *         unexpected interrupt.  This simply enters an infinite loop, preserving
+ *         the system state for examination by a debugger.
+ * @param  None     
+ * @retval None       
+*/
+    .section  .text.Default_Handler,"ax",%progbits
+Default_Handler:
+Infinite_Loop:
+  b  Infinite_Loop
+  .size  Default_Handler, .-Default_Handler
+/******************************************************************************
+*
+* The minimal vector table for a Cortex M3. Note that the proper constructs
+* must be placed on this to ensure that it ends up at physical address
+* 0x0000.0000.
+* 
+*******************************************************************************/
+   .section  .isr_vector,"a",%progbits
+  .type  g_pfnVectors, %object
+  .size  g_pfnVectors, .-g_pfnVectors
+    
+g_pfnVectors:
+  .word  _estack
+  .word  Reset_Handler
+  .word  NMI_Handler
+  .word  HardFault_Handler
+  .word  MemManage_Handler
+  .word  BusFault_Handler
+  .word  UsageFault_Handler
+  .word  0
+  .word  0
+  .word  0
+  .word  0
+  .word  SVC_Handler
+  .word  DebugMon_Handler
+  .word  0
+  .word  PendSV_Handler
+  .word  SysTick_Handler
+
+  /* External Interrupts */
+  .word     WWDG_IRQHandler                   /* Window WatchDog                             */
+  .word     PVD_IRQHandler                    /* PVD through EXTI Line detection             */
+  .word     TAMP_STAMP_IRQHandler             /* Tamper and TimeStamps through the EXTI line */
+  .word     RTC_WKUP_IRQHandler               /* RTC Wakeup through the EXTI line            */
+  .word     FLASH_IRQHandler                  /* FLASH                                       */
+  .word     RCC_IRQHandler                    /* RCC                                         */
+  .word     EXTI0_IRQHandler                  /* EXTI Line0                                  */
+  .word     EXTI1_IRQHandler                  /* EXTI Line1                                  */
+  .word     EXTI2_IRQHandler                  /* EXTI Line2                                  */
+  .word     EXTI3_IRQHandler                  /* EXTI Line3                                  */
+  .word     EXTI4_IRQHandler                  /* EXTI Line4                                  */
+  .word     DMA1_Stream0_IRQHandler           /* DMA1 Stream 0                               */
+  .word     DMA1_Stream1_IRQHandler           /* DMA1 Stream 1                               */
+  .word     DMA1_Stream2_IRQHandler           /* DMA1 Stream 2                               */
+  .word     DMA1_Stream3_IRQHandler           /* DMA1 Stream 3                               */
+  .word     DMA1_Stream4_IRQHandler           /* DMA1 Stream 4                               */
+  .word     DMA1_Stream5_IRQHandler           /* DMA1 Stream 5                               */
+  .word     DMA1_Stream6_IRQHandler           /* DMA1 Stream 6                               */
+  .word     ADC_IRQHandler                    /* ADC1, ADC2 and ADC3s                        */
+  .word     CAN1_TX_IRQHandler                /* CAN1 TX                                     */
+  .word     CAN1_RX0_IRQHandler               /* CAN1 RX0                                    */
+  .word     CAN1_RX1_IRQHandler               /* CAN1 RX1                                    */
+  .word     CAN1_SCE_IRQHandler               /* CAN1 SCE                                    */
+  .word     EXTI9_5_IRQHandler                /* External Line[9:5]s                         */
+  .word     TIM1_BRK_TIM9_IRQHandler          /* TIM1 Break and TIM9                         */
+  .word     TIM1_UP_TIM10_IRQHandler          /* TIM1 Update and TIM10                       */
+  .word     TIM1_TRG_COM_TIM11_IRQHandler     /* TIM1 Trigger and Commutation and TIM11      */
+  .word     TIM1_CC_IRQHandler                /* TIM1 Capture Compare                        */
+  .word     TIM2_IRQHandler                   /* TIM2                                        */
+  .word     TIM3_IRQHandler                   /* TIM3                                        */
+  .word     TIM4_IRQHandler                   /* TIM4                                        */
+  .word     I2C1_EV_IRQHandler                /* I2C1 Event                                  */
+  .word     I2C1_ER_IRQHandler                /* I2C1 Error                                  */
+  .word     I2C2_EV_IRQHandler                /* I2C2 Event                                  */
+  .word     I2C2_ER_IRQHandler                /* I2C2 Error                                  */
+  .word     SPI1_IRQHandler                   /* SPI1                                        */
+  .word     SPI2_IRQHandler                   /* SPI2                                        */
+  .word     USART1_IRQHandler                 /* USART1                                      */
+  .word     USART2_IRQHandler                 /* USART2                                      */
+  .word     USART3_IRQHandler                 /* USART3                                      */
+  .word     EXTI15_10_IRQHandler              /* External Line[15:10]s                       */
+  .word     RTC_Alarm_IRQHandler              /* RTC Alarm (A and B) through EXTI Line       */
+  .word     OTG_FS_WKUP_IRQHandler            /* USB OTG FS Wakeup through EXTI line         */
+  .word     TIM8_BRK_TIM12_IRQHandler         /* TIM8 Break and TIM12                        */
+  .word     TIM8_UP_TIM13_IRQHandler          /* TIM8 Update and TIM13                       */
+  .word     TIM8_TRG_COM_TIM14_IRQHandler     /* TIM8 Trigger and Commutation and TIM14      */
+  .word     TIM8_CC_IRQHandler                /* TIM8 Capture Compare                        */
+  .word     DMA1_Stream7_IRQHandler           /* DMA1 Stream7                                */
+  .word     0                                 /* Reserved                                    */
+  .word     SDIO_IRQHandler                   /* SDIO                                        */
+  .word     TIM5_IRQHandler                   /* TIM5                                        */
+  .word     SPI3_IRQHandler                   /* SPI3                                        */
+  .word     0                                 /* Reserved                                    */
+  .word     0                                 /* Reserved                                    */
+  .word     TIM6_IRQHandler                   /* TIM6                                        */
+  .word     TIM7_IRQHandler                   /* TIM7                                        */
+  .word     DMA2_Stream0_IRQHandler           /* DMA2 Stream 0                               */
+  .word     DMA2_Stream1_IRQHandler           /* DMA2 Stream 1                               */
+  .word     DMA2_Stream2_IRQHandler           /* DMA2 Stream 2                               */
+  .word     DMA2_Stream3_IRQHandler           /* DMA2 Stream 3                               */
+  .word     DMA2_Stream4_IRQHandler           /* DMA2 Stream 4                               */
+  .word     DFSDM1_FLT0_IRQHandler            /* DFSDM1 Filter0                              */
+  .word     DFSDM1_FLT1_IRQHandler            /* DFSDM1 Filter1                              */
+  .word     CAN2_TX_IRQHandler                /* CAN2 TX                                     */
+  .word     CAN2_RX0_IRQHandler               /* CAN2 RX0                                    */
+  .word     CAN2_RX1_IRQHandler               /* CAN2 RX1                                    */
+  .word     CAN2_SCE_IRQHandler               /* CAN2 SCE                                    */
+  .word     OTG_FS_IRQHandler                 /* USB OTG FS                                  */
+  .word     DMA2_Stream5_IRQHandler           /* DMA2 Stream 5                               */
+  .word     DMA2_Stream6_IRQHandler           /* DMA2 Stream 6                               */
+  .word     DMA2_Stream7_IRQHandler           /* DMA2 Stream 7                               */
+  .word     USART6_IRQHandler                 /* USART6                                      */
+  .word     I2C3_EV_IRQHandler                /* I2C3 event                                  */
+  .word     I2C3_ER_IRQHandler                /* I2C3 error                                  */
+  .word     0                                 /* Reserved                                    */
+  .word     0                                 /* Reserved                                    */
+  .word     0                                 /* Reserved                                    */
+  .word     0                                 /* Reserved                                    */
+  .word     0                                 /* Reserved                                    */
+  .word     0                                 /* Reserved                                    */
+  .word     RNG_IRQHandler                    /* RNG                                         */
+  .word     FPU_IRQHandler                    /* FPU                                         */
+  .word     0                                 /* Reserved                                    */
+  .word     0                                 /* Reserved                                    */
+  .word     SPI4_IRQHandler                   /* SPI4                                        */
+  .word     SPI5_IRQHandler                   /* SPI5                                        */
+  .word     0                                 /* Reserved                                    */
+  .word     0                                 /* Reserved                                    */
+  .word     0                                 /* Reserved                                    */
+  .word     0                                 /* Reserved                                    */
+  .word     0                                 /* Reserved                                    */
+  .word     0                                 /* Reserved                                    */
+  .word     QUADSPI_IRQHandler                /* QuadSPI                                     */
+  .word     0                                 /* Reserved                                    */
+  .word     0                                 /* Reserved                                    */
+  .word     FMPI2C1_EV_IRQHandler             /* FMPI2C1 Event                               */
+  .word     FMPI2C1_ER_IRQHandler             /* FMPI2C1 Error                               */
+
+/*******************************************************************************
+*
+* Provide weak aliases for each Exception handler to the Default_Handler. 
+* As they are weak aliases, any function with the same name will override 
+* this definition.
+*
+*******************************************************************************/
+   .weak      NMI_Handler
+   .thumb_set NMI_Handler,Default_Handler
+
+   .weak      HardFault_Handler
+   .thumb_set HardFault_Handler,Default_Handler
+
+   .weak      MemManage_Handler
+   .thumb_set MemManage_Handler,Default_Handler
+  
+   .weak      BusFault_Handler
+   .thumb_set BusFault_Handler,Default_Handler
+
+   .weak      UsageFault_Handler
+   .thumb_set UsageFault_Handler,Default_Handler
+
+   .weak      SVC_Handler
+   .thumb_set SVC_Handler,Default_Handler
+
+   .weak      DebugMon_Handler
+   .thumb_set DebugMon_Handler,Default_Handler
+
+   .weak      PendSV_Handler
+   .thumb_set PendSV_Handler,Default_Handler
+
+   .weak      SysTick_Handler
+   .thumb_set SysTick_Handler,Default_Handler
+
+   .weak      WWDG_IRQHandler
+   .thumb_set WWDG_IRQHandler,Default_Handler
+
+   .weak      PVD_IRQHandler
+   .thumb_set PVD_IRQHandler,Default_Handler
+
+   .weak      TAMP_STAMP_IRQHandler
+   .thumb_set TAMP_STAMP_IRQHandler,Default_Handler
+
+   .weak      RTC_WKUP_IRQHandler
+   .thumb_set RTC_WKUP_IRQHandler,Default_Handler
+
+   .weak      FLASH_IRQHandler
+   .thumb_set FLASH_IRQHandler,Default_Handler
+
+   .weak      RCC_IRQHandler
+   .thumb_set RCC_IRQHandler,Default_Handler
+
+   .weak      EXTI0_IRQHandler
+   .thumb_set EXTI0_IRQHandler,Default_Handler
+
+   .weak      EXTI1_IRQHandler
+   .thumb_set EXTI1_IRQHandler,Default_Handler
+
+   .weak      EXTI2_IRQHandler
+   .thumb_set EXTI2_IRQHandler,Default_Handler 
+
+   .weak      EXTI3_IRQHandler
+   .thumb_set EXTI3_IRQHandler,Default_Handler
+
+   .weak      EXTI4_IRQHandler
+   .thumb_set EXTI4_IRQHandler,Default_Handler
+
+   .weak      DMA1_Stream0_IRQHandler
+   .thumb_set DMA1_Stream0_IRQHandler,Default_Handler
+
+   .weak      DMA1_Stream1_IRQHandler
+   .thumb_set DMA1_Stream1_IRQHandler,Default_Handler
+
+   .weak      DMA1_Stream2_IRQHandler
+   .thumb_set DMA1_Stream2_IRQHandler,Default_Handler
+
+   .weak      DMA1_Stream3_IRQHandler
+   .thumb_set DMA1_Stream3_IRQHandler,Default_Handler
+
+   .weak      DMA1_Stream4_IRQHandler
+   .thumb_set DMA1_Stream4_IRQHandler,Default_Handler
+
+   .weak      DMA1_Stream5_IRQHandler
+   .thumb_set DMA1_Stream5_IRQHandler,Default_Handler
+
+   .weak      DMA1_Stream6_IRQHandler
+   .thumb_set DMA1_Stream6_IRQHandler,Default_Handler
+
+   .weak      ADC_IRQHandler
+   .thumb_set ADC_IRQHandler,Default_Handler
+
+   .weak      CAN1_TX_IRQHandler
+   .thumb_set CAN1_TX_IRQHandler,Default_Handler
+
+   .weak      CAN1_RX0_IRQHandler
+   .thumb_set CAN1_RX0_IRQHandler,Default_Handler
+
+   .weak      CAN1_RX1_IRQHandler
+   .thumb_set CAN1_RX1_IRQHandler,Default_Handler
+
+   .weak      CAN1_SCE_IRQHandler
+   .thumb_set CAN1_SCE_IRQHandler,Default_Handler
+
+   .weak      EXTI9_5_IRQHandler
+   .thumb_set EXTI9_5_IRQHandler,Default_Handler
+
+   .weak      TIM1_BRK_TIM9_IRQHandler
+   .thumb_set TIM1_BRK_TIM9_IRQHandler,Default_Handler
+
+   .weak      TIM1_UP_TIM10_IRQHandler
+   .thumb_set TIM1_UP_TIM10_IRQHandler,Default_Handler
+
+   .weak      TIM1_TRG_COM_TIM11_IRQHandler
+   .thumb_set TIM1_TRG_COM_TIM11_IRQHandler,Default_Handler
+
+   .weak      TIM1_CC_IRQHandler
+   .thumb_set TIM1_CC_IRQHandler,Default_Handler
+
+   .weak      TIM2_IRQHandler
+   .thumb_set TIM2_IRQHandler,Default_Handler
+
+   .weak      TIM3_IRQHandler
+   .thumb_set TIM3_IRQHandler,Default_Handler
+
+   .weak      TIM4_IRQHandler
+   .thumb_set TIM4_IRQHandler,Default_Handler
+
+   .weak      I2C1_EV_IRQHandler
+   .thumb_set I2C1_EV_IRQHandler,Default_Handler
+
+   .weak      I2C1_ER_IRQHandler
+   .thumb_set I2C1_ER_IRQHandler,Default_Handler
+
+   .weak      I2C2_EV_IRQHandler
+   .thumb_set I2C2_EV_IRQHandler,Default_Handler
+
+   .weak      I2C2_ER_IRQHandler
+   .thumb_set I2C2_ER_IRQHandler,Default_Handler
+
+   .weak      SPI1_IRQHandler
+   .thumb_set SPI1_IRQHandler,Default_Handler
+
+   .weak      SPI2_IRQHandler
+   .thumb_set SPI2_IRQHandler,Default_Handler
+
+   .weak      USART1_IRQHandler
+   .thumb_set USART1_IRQHandler,Default_Handler
+
+   .weak      USART2_IRQHandler
+   .thumb_set USART2_IRQHandler,Default_Handler
+
+   .weak      USART3_IRQHandler
+   .thumb_set USART3_IRQHandler,Default_Handler
+
+   .weak      EXTI15_10_IRQHandler
+   .thumb_set EXTI15_10_IRQHandler,Default_Handler
+
+   .weak      RTC_Alarm_IRQHandler
+   .thumb_set RTC_Alarm_IRQHandler,Default_Handler
+
+   .weak      OTG_FS_WKUP_IRQHandler
+   .thumb_set OTG_FS_WKUP_IRQHandler,Default_Handler
+
+   .weak      TIM8_BRK_TIM12_IRQHandler
+   .thumb_set TIM8_BRK_TIM12_IRQHandler,Default_Handler
+
+   .weak      TIM8_UP_TIM13_IRQHandler
+   .thumb_set TIM8_UP_TIM13_IRQHandler,Default_Handler
+
+   .weak      TIM8_TRG_COM_TIM14_IRQHandler
+   .thumb_set TIM8_TRG_COM_TIM14_IRQHandler,Default_Handler
+
+   .weak      TIM8_CC_IRQHandler
+   .thumb_set TIM8_CC_IRQHandler,Default_Handler
+
+   .weak      DMA1_Stream7_IRQHandler
+   .thumb_set DMA1_Stream7_IRQHandler,Default_Handler
+
+   .weak      SDIO_IRQHandler
+   .thumb_set SDIO_IRQHandler,Default_Handler
+
+   .weak      TIM5_IRQHandler
+   .thumb_set TIM5_IRQHandler,Default_Handler
+
+   .weak      SPI3_IRQHandler
+   .thumb_set SPI3_IRQHandler,Default_Handler
+
+   .weak      TIM6_IRQHandler
+   .thumb_set TIM6_IRQHandler,Default_Handler
+
+   .weak      TIM7_IRQHandler
+   .thumb_set TIM7_IRQHandler,Default_Handler
+
+   .weak      DMA2_Stream0_IRQHandler
+   .thumb_set DMA2_Stream0_IRQHandler,Default_Handler
+
+   .weak      DMA2_Stream1_IRQHandler
+   .thumb_set DMA2_Stream1_IRQHandler,Default_Handler
+
+   .weak      DMA2_Stream2_IRQHandler
+   .thumb_set DMA2_Stream2_IRQHandler,Default_Handler
+
+   .weak      DMA2_Stream3_IRQHandler
+   .thumb_set DMA2_Stream3_IRQHandler,Default_Handler
+
+   .weak      DMA2_Stream4_IRQHandler
+   .thumb_set DMA2_Stream4_IRQHandler,Default_Handler
+
+   .weak      DFSDM1_FLT0_IRQHandler
+   .thumb_set DFSDM1_FLT0_IRQHandler,Default_Handler
+
+   .weak      DFSDM1_FLT1_IRQHandler
+   .thumb_set DFSDM1_FLT1_IRQHandler,Default_Handler
+
+   .weak      CAN2_TX_IRQHandler
+   .thumb_set CAN2_TX_IRQHandler,Default_Handler
+
+   .weak      CAN2_RX0_IRQHandler
+   .thumb_set CAN2_RX0_IRQHandler,Default_Handler
+
+   .weak      CAN2_RX1_IRQHandler
+   .thumb_set CAN2_RX1_IRQHandler,Default_Handler
+
+   .weak      CAN2_SCE_IRQHandler
+   .thumb_set CAN2_SCE_IRQHandler,Default_Handler
+
+   .weak      OTG_FS_IRQHandler
+   .thumb_set OTG_FS_IRQHandler,Default_Handler
+
+   .weak      DMA2_Stream5_IRQHandler
+   .thumb_set DMA2_Stream5_IRQHandler,Default_Handler
+
+   .weak      DMA2_Stream6_IRQHandler
+   .thumb_set DMA2_Stream6_IRQHandler,Default_Handler
+
+   .weak      DMA2_Stream7_IRQHandler
+   .thumb_set DMA2_Stream7_IRQHandler,Default_Handler
+
+   .weak      USART6_IRQHandler
+   .thumb_set USART6_IRQHandler,Default_Handler
+
+   .weak      I2C3_EV_IRQHandler
+   .thumb_set I2C3_EV_IRQHandler,Default_Handler
+
+   .weak      I2C3_ER_IRQHandler
+   .thumb_set I2C3_ER_IRQHandler,Default_Handler
+
+   .weak      RNG_IRQHandler
+   .thumb_set RNG_IRQHandler,Default_Handler
+
+   .weak      FPU_IRQHandler
+   .thumb_set FPU_IRQHandler,Default_Handler
+
+   .weak      SPI4_IRQHandler
+   .thumb_set SPI4_IRQHandler,Default_Handler
+
+   .weak      SPI5_IRQHandler
+   .thumb_set SPI5_IRQHandler,Default_Handler
+
+   .weak      QUADSPI_IRQHandler
+   .thumb_set QUADSPI_IRQHandler,Default_Handler
+
+    .weak     FMPI2C1_EV_IRQHandler
+   .thumb_set FMPI2C1_EV_IRQHandler,Default_Handler
+
+   .weak      FMPI2C1_ER_IRQHandler
+   .thumb_set FMPI2C1_ER_IRQHandler,Default_Handler
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/ports/stm/boards/stm32f411ce_blackpill/board.c b/ports/stm/boards/stm32f411ce_blackpill/board.c
new file mode 100644
index 000000000..82b0c506e
--- /dev/null
+++ b/ports/stm/boards/stm32f411ce_blackpill/board.c
@@ -0,0 +1,39 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "boards/board.h"
+#include "mpconfigboard.h"
+
+void board_init(void) {
+}
+
+bool board_requests_safe_mode(void) {
+    return false;
+}
+
+void reset_board(void) {
+
+}
diff --git a/ports/stm/boards/stm32f411ce_blackpill/mpconfigboard.h b/ports/stm/boards/stm32f411ce_blackpill/mpconfigboard.h
new file mode 100644
index 000000000..2ae1a2926
--- /dev/null
+++ b/ports/stm/boards/stm32f411ce_blackpill/mpconfigboard.h
@@ -0,0 +1,48 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+//Micropython setup
+
+#define MICROPY_HW_BOARD_NAME       "stm32f411ce-blackpill"
+#define MICROPY_HW_MCU_NAME         "STM32F411CE"
+
+#define FLASH_SIZE                  (0x80000)
+#define FLASH_PAGE_SIZE             (0x4000)
+
+#define BOARD_OSC_DIV (25)
+#define BOARD_NO_VBUS_SENSE (1)
+
+// On-board flash
+// #define SPI_FLASH_MOSI_PIN          (&pin_PA07)
+// #define SPI_FLASH_MISO_PIN          (&pin_PA06)
+// #define SPI_FLASH_SCK_PIN           (&pin_PA05)
+// #define SPI_FLASH_CS_PIN            (&pin_PA04)
+
+#define CIRCUITPY_AUTORELOAD_DELAY_MS (500)
+
+#define BOARD_FLASH_SIZE (FLASH_SIZE - 0x2000 - 0xC000)
+
+#define AUTORESET_DELAY_MS (500)
diff --git a/ports/stm/boards/stm32f411ce_blackpill/mpconfigboard.mk b/ports/stm/boards/stm32f411ce_blackpill/mpconfigboard.mk
new file mode 100644
index 000000000..68c6a1eea
--- /dev/null
+++ b/ports/stm/boards/stm32f411ce_blackpill/mpconfigboard.mk
@@ -0,0 +1,21 @@
+USB_VID = 0x239A
+USB_PID = 0x806A
+USB_PRODUCT = "stm32f411ce blackpill"
+USB_MANUFACTURER = "Unknown"
+USB_DEVICES = "CDC,MSC"
+
+# SPI_FLASH_FILESYSTEM = 1
+# EXTERNAL_FLASH_DEVICE_COUNT = 1
+# EXTERNAL_FLASH_DEVICES = xxxxxx #See supervisor/shared/external_flash/devices.h for options
+# LONGINT_IMPL = MPZ
+
+INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL = NONE
+
+MCU_SERIES = m4
+MCU_VARIANT = stm32f4
+MCU_SUB_VARIANT = stm32f411xe
+MCU_PACKAGE = 48
+CMSIS_MCU = STM32F411xE
+LD_FILE = boards/STM32F411VETx_FLASH.ld
+
diff --git a/ports/stm/boards/stm32f411ce_blackpill/pins.c b/ports/stm/boards/stm32f411ce_blackpill/pins.c
new file mode 100644
index 000000000..aa9736fc4
--- /dev/null
+++ b/ports/stm/boards/stm32f411ce_blackpill/pins.c
@@ -0,0 +1,39 @@
+#include "shared-bindings/board/__init__.h"
+
+STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_B12), MP_ROM_PTR(&pin_PB12) },
+    { MP_ROM_QSTR(MP_QSTR_B13), MP_ROM_PTR(&pin_PB13) },
+    { MP_ROM_QSTR(MP_QSTR_B14), MP_ROM_PTR(&pin_PB14) },
+    { MP_ROM_QSTR(MP_QSTR_B15), MP_ROM_PTR(&pin_PB15) },
+    { MP_ROM_QSTR(MP_QSTR_A8), MP_ROM_PTR(&pin_PA08) },
+    { MP_ROM_QSTR(MP_QSTR_A9), MP_ROM_PTR(&pin_PA09) },  //USB (shouldn't be used)
+    { MP_ROM_QSTR(MP_QSTR_A10), MP_ROM_PTR(&pin_PA10) }, //USB (shouldn't be used)
+    { MP_ROM_QSTR(MP_QSTR_A11), MP_ROM_PTR(&pin_PA11) }, //USB (shouldn't be used)
+    { MP_ROM_QSTR(MP_QSTR_A12), MP_ROM_PTR(&pin_PA12) }, //USB (shouldn't be used)
+    { MP_ROM_QSTR(MP_QSTR_A15), MP_ROM_PTR(&pin_PA15) },
+    { MP_ROM_QSTR(MP_QSTR_B3), MP_ROM_PTR(&pin_PB03) },
+    { MP_ROM_QSTR(MP_QSTR_B4), MP_ROM_PTR(&pin_PB04) },
+    { MP_ROM_QSTR(MP_QSTR_B5), MP_ROM_PTR(&pin_PB05) },
+    { MP_ROM_QSTR(MP_QSTR_B6), MP_ROM_PTR(&pin_PB06) },
+    { MP_ROM_QSTR(MP_QSTR_B7), MP_ROM_PTR(&pin_PB07) },
+    { MP_ROM_QSTR(MP_QSTR_B8), MP_ROM_PTR(&pin_PB08) },
+    { MP_ROM_QSTR(MP_QSTR_B9), MP_ROM_PTR(&pin_PB09) },
+
+    { MP_ROM_QSTR(MP_QSTR_B10), MP_ROM_PTR(&pin_PB10) },
+    { MP_ROM_QSTR(MP_QSTR_B2), MP_ROM_PTR(&pin_PB02) },
+    { MP_ROM_QSTR(MP_QSTR_B1), MP_ROM_PTR(&pin_PB01) },
+    { MP_ROM_QSTR(MP_QSTR_B0), MP_ROM_PTR(&pin_PB00) },
+    { MP_ROM_QSTR(MP_QSTR_A7), MP_ROM_PTR(&pin_PA07) },
+    { MP_ROM_QSTR(MP_QSTR_A6), MP_ROM_PTR(&pin_PA06) },
+    { MP_ROM_QSTR(MP_QSTR_A5), MP_ROM_PTR(&pin_PA05) },
+    { MP_ROM_QSTR(MP_QSTR_A4), MP_ROM_PTR(&pin_PA04) },
+    { MP_ROM_QSTR(MP_QSTR_A3), MP_ROM_PTR(&pin_PA03) },
+    { MP_ROM_QSTR(MP_QSTR_A2), MP_ROM_PTR(&pin_PA02) },
+    { MP_ROM_QSTR(MP_QSTR_A1), MP_ROM_PTR(&pin_PA01) },
+    { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA00) },
+    { MP_ROM_QSTR(MP_QSTR_C15), MP_ROM_PTR(&pin_PC15) },
+    { MP_ROM_QSTR(MP_QSTR_C14), MP_ROM_PTR(&pin_PC14) },
+    { MP_ROM_QSTR(MP_QSTR_C13), MP_ROM_PTR(&pin_PC13) },    
+    { MP_ROM_QSTR(MP_QSTR_LED), MP_ROM_PTR(&pin_PC13) },   
+};
+MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/stm/boards/stm32f411ce_blackpill/stm32f4xx_hal_conf.h b/ports/stm/boards/stm32f411ce_blackpill/stm32f4xx_hal_conf.h
new file mode 100644
index 000000000..81d29f242
--- /dev/null
+++ b/ports/stm/boards/stm32f411ce_blackpill/stm32f4xx_hal_conf.h
@@ -0,0 +1,440 @@
+/**
+  ******************************************************************************
+  * @file    stm32f4xx_hal_conf_template.h
+  * @author  MCD Application Team
+  * @brief   HAL configuration template file. 
+  *          This file should be copied to the application folder and renamed
+  *          to stm32f4xx_hal_conf.h.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */ 
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __STM32F4xx_HAL_CONF_H
+#define __STM32F4xx_HAL_CONF_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+
+/* ########################## Module Selection ############################## */
+/**
+  * @brief This is the list of modules to be used in the HAL driver 
+  */
+#define HAL_MODULE_ENABLED  
+
+#define HAL_ADC_MODULE_ENABLED
+/* #define HAL_CRYP_MODULE_ENABLED   */
+/* #define HAL_CAN_MODULE_ENABLED   */
+/* #define HAL_CRC_MODULE_ENABLED   */
+/* #define HAL_CRYP_MODULE_ENABLED   */
+#define HAL_DAC_MODULE_ENABLED
+/* #define HAL_DCMI_MODULE_ENABLED   */
+/* #define HAL_DMA2D_MODULE_ENABLED   */
+/* #define HAL_ETH_MODULE_ENABLED   */
+/* #define HAL_NAND_MODULE_ENABLED   */
+/* #define HAL_NOR_MODULE_ENABLED   */
+/* #define HAL_PCCARD_MODULE_ENABLED   */
+/* #define HAL_SRAM_MODULE_ENABLED   */
+/* #define HAL_SDRAM_MODULE_ENABLED   */
+/* #define HAL_HASH_MODULE_ENABLED   */
+#define HAL_I2C_MODULE_ENABLED
+#define HAL_I2S_MODULE_ENABLED
+/* #define HAL_IWDG_MODULE_ENABLED   */
+/* #define HAL_LTDC_MODULE_ENABLED   */
+/* #define HAL_RNG_MODULE_ENABLED   */
+/* #define HAL_RTC_MODULE_ENABLED   */
+/* #define HAL_SAI_MODULE_ENABLED   */
+/* #define HAL_SD_MODULE_ENABLED   */
+/* #define HAL_MMC_MODULE_ENABLED   */
+#define HAL_SPI_MODULE_ENABLED
+#define HAL_TIM_MODULE_ENABLED
+#define HAL_UART_MODULE_ENABLED   
+#define HAL_USART_MODULE_ENABLED
+/* #define HAL_IRDA_MODULE_ENABLED   */
+/* #define HAL_SMARTCARD_MODULE_ENABLED   */
+/* #define HAL_WWDG_MODULE_ENABLED   */
+/* #define HAL_PCD_MODULE_ENABLED */
+/* #define HAL_HCD_MODULE_ENABLED   */
+/* #define HAL_DSI_MODULE_ENABLED   */
+/* #define HAL_QSPI_MODULE_ENABLED   */
+/* #define HAL_QSPI_MODULE_ENABLED   */
+/* #define HAL_CEC_MODULE_ENABLED   */
+/* #define HAL_FMPI2C_MODULE_ENABLED   */
+/* #define HAL_SPDIFRX_MODULE_ENABLED   */
+/* #define HAL_DFSDM_MODULE_ENABLED   */
+/* #define HAL_LPTIM_MODULE_ENABLED   */
+/* #define HAL_EXTI_MODULE_ENABLED   */
+#define HAL_GPIO_MODULE_ENABLED
+#define HAL_EXTI_MODULE_ENABLED
+#define HAL_DMA_MODULE_ENABLED
+#define HAL_RCC_MODULE_ENABLED
+#define HAL_FLASH_MODULE_ENABLED
+#define HAL_PWR_MODULE_ENABLED
+#define HAL_CORTEX_MODULE_ENABLED
+
+/* ########################## HSE/HSI Values adaptation ##################### */
+/**
+  * @brief Adjust the value of External High Speed oscillator (HSE) used in your application.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSE is used as system clock source, directly or through the PLL).  
+  */
+#if !defined  (HSE_VALUE) 
+  #define HSE_VALUE    ((uint32_t)25000000) /*!< Value of the External oscillator in Hz */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSE_STARTUP_TIMEOUT)
+  #define HSE_STARTUP_TIMEOUT    ((uint32_t)100U)   /*!< Time out for HSE start up, in ms */
+#endif /* HSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief Internal High Speed oscillator (HSI) value.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSI is used as system clock source, directly or through the PLL). 
+  */
+#if !defined  (HSI_VALUE)
+  #define HSI_VALUE    ((uint32_t)16000000) /*!< Value of the Internal oscillator in Hz*/
+#endif /* HSI_VALUE */
+
+/**
+  * @brief Internal Low Speed oscillator (LSI) value.
+  */
+#if !defined  (LSI_VALUE) 
+ #define LSI_VALUE  ((uint32_t)40000)    
+#endif /* LSI_VALUE */                      /*!< Value of the Internal Low Speed oscillator in Hz
+                                             The real value may vary depending on the variations
+                                             in voltage and temperature.  */
+/**
+  * @brief External Low Speed oscillator (LSE) value.
+  */
+#if !defined  (LSE_VALUE)
+ #define LSE_VALUE  ((uint32_t)32768)    /*!< Value of the External Low Speed oscillator in Hz */
+#endif /* LSE_VALUE */
+
+#if !defined  (LSE_STARTUP_TIMEOUT)
+  #define LSE_STARTUP_TIMEOUT    ((uint32_t)5000U)   /*!< Time out for LSE start up, in ms */
+#endif /* LSE_STARTUP_TIMEOUT */
+
+
+/**
+  * @brief External clock source for I2S peripheral
+  *        This value is used by the I2S HAL module to compute the I2S clock source 
+  *        frequency, this source is inserted directly through I2S_CKIN pad. 
+  */
+#if !defined  (EXTERNAL_CLOCK_VALUE)
+  #define EXTERNAL_CLOCK_VALUE    ((uint32_t)12288000U) /*!< Value of the External audio frequency in Hz*/
+#endif /* EXTERNAL_CLOCK_VALUE */
+
+/* Tip: To avoid modifying this file each time you need to use different HSE,
+   ===  you can define the HSE value in your toolchain compiler preprocessor. */
+
+/* ########################### System Configuration ######################### */
+/**
+  * @brief This is the HAL system configuration section
+  */
+#define  VDD_VALUE          ((uint32_t)3300U) /*!< Value of VDD in mv */           
+#define  TICK_INT_PRIORITY            ((uint32_t)0U)   /*!< tick interrupt priority */            
+#define  USE_RTOS                     0U     
+#define  PREFETCH_ENABLE              1U
+#define  INSTRUCTION_CACHE_ENABLE     1U
+#define  DATA_CACHE_ENABLE            1U
+
+/* ########################## Assert Selection ############################## */
+/**
+  * @brief Uncomment the line below to expanse the "assert_param" macro in the 
+  *        HAL drivers code
+  */
+/* #define USE_FULL_ASSERT    1U */
+
+/* ################## Ethernet peripheral configuration ##################### */
+
+/* Section 1 : Ethernet peripheral configuration */
+
+/* MAC ADDRESS: MAC_ADDR0:MAC_ADDR1:MAC_ADDR2:MAC_ADDR3:MAC_ADDR4:MAC_ADDR5 */
+#define MAC_ADDR0   2U
+#define MAC_ADDR1   0U
+#define MAC_ADDR2   0U
+#define MAC_ADDR3   0U
+#define MAC_ADDR4   0U
+#define MAC_ADDR5   0U
+
+/* Definition of the Ethernet driver buffers size and count */   
+#define ETH_RX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for receive               */
+#define ETH_TX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for transmit              */
+#define ETH_RXBUFNB                    ((uint32_t)4U)       /* 4 Rx buffers of size ETH_RX_BUF_SIZE  */
+#define ETH_TXBUFNB                    ((uint32_t)4U)       /* 4 Tx buffers of size ETH_TX_BUF_SIZE  */
+
+/* Section 2: PHY configuration section */
+
+/* DP83848_PHY_ADDRESS Address*/ 
+#define DP83848_PHY_ADDRESS           0x01U
+/* PHY Reset delay these values are based on a 1 ms Systick interrupt*/ 
+#define PHY_RESET_DELAY                 ((uint32_t)0x000000FFU)
+/* PHY Configuration delay */
+#define PHY_CONFIG_DELAY                ((uint32_t)0x00000FFFU)
+
+#define PHY_READ_TO                     ((uint32_t)0x0000FFFFU)
+#define PHY_WRITE_TO                    ((uint32_t)0x0000FFFFU)
+
+/* Section 3: Common PHY Registers */
+
+#define PHY_BCR                         ((uint16_t)0x0000U)    /*!< Transceiver Basic Control Register   */
+#define PHY_BSR                         ((uint16_t)0x0001U)    /*!< Transceiver Basic Status Register    */
+ 
+#define PHY_RESET                       ((uint16_t)0x8000U)  /*!< PHY Reset */
+#define PHY_LOOPBACK                    ((uint16_t)0x4000U)  /*!< Select loop-back mode */
+#define PHY_FULLDUPLEX_100M             ((uint16_t)0x2100U)  /*!< Set the full-duplex mode at 100 Mb/s */
+#define PHY_HALFDUPLEX_100M             ((uint16_t)0x2000U)  /*!< Set the half-duplex mode at 100 Mb/s */
+#define PHY_FULLDUPLEX_10M              ((uint16_t)0x0100U)  /*!< Set the full-duplex mode at 10 Mb/s  */
+#define PHY_HALFDUPLEX_10M              ((uint16_t)0x0000U)  /*!< Set the half-duplex mode at 10 Mb/s  */
+#define PHY_AUTONEGOTIATION             ((uint16_t)0x1000U)  /*!< Enable auto-negotiation function     */
+#define PHY_RESTART_AUTONEGOTIATION     ((uint16_t)0x0200U)  /*!< Restart auto-negotiation function    */
+#define PHY_POWERDOWN                   ((uint16_t)0x0800U)  /*!< Select the power down mode           */
+#define PHY_ISOLATE                     ((uint16_t)0x0400U)  /*!< Isolate PHY from MII                 */
+
+#define PHY_AUTONEGO_COMPLETE           ((uint16_t)0x0020U)  /*!< Auto-Negotiation process completed   */
+#define PHY_LINKED_STATUS               ((uint16_t)0x0004U)  /*!< Valid link established               */
+#define PHY_JABBER_DETECTION            ((uint16_t)0x0002U)  /*!< Jabber condition detected            */
+  
+/* Section 4: Extended PHY Registers */
+#define PHY_SR                          ((uint16_t)0x10U)    /*!< PHY status register Offset                      */
+
+#define PHY_SPEED_STATUS                ((uint16_t)0x0002U)  /*!< PHY Speed mask                                  */
+#define PHY_DUPLEX_STATUS               ((uint16_t)0x0004U)  /*!< PHY Duplex mask                                 */
+
+/* ################## SPI peripheral configuration ########################## */
+
+/* CRC FEATURE: Use to activate CRC feature inside HAL SPI Driver
+* Activated: CRC code is present inside driver
+* Deactivated: CRC code cleaned from driver
+*/
+
+#define USE_SPI_CRC                     0U
+
+/* Includes ------------------------------------------------------------------*/
+/**
+  * @brief Include module's header file 
+  */
+
+#ifdef HAL_RCC_MODULE_ENABLED
+  #include "stm32f4xx_hal_rcc.h"
+#endif /* HAL_RCC_MODULE_ENABLED */
+
+#ifdef HAL_EXTI_MODULE_ENABLED
+  #include "stm32f4xx_hal_exti.h"
+#endif /* HAL_EXTI_MODULE_ENABLED */
+
+#ifdef HAL_GPIO_MODULE_ENABLED
+  #include "stm32f4xx_hal_gpio.h"
+#endif /* HAL_GPIO_MODULE_ENABLED */
+
+#ifdef HAL_DMA_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma.h"
+#endif /* HAL_DMA_MODULE_ENABLED */
+   
+#ifdef HAL_CORTEX_MODULE_ENABLED
+  #include "stm32f4xx_hal_cortex.h"
+#endif /* HAL_CORTEX_MODULE_ENABLED */
+
+#ifdef HAL_ADC_MODULE_ENABLED
+  #include "stm32f4xx_hal_adc.h"
+#endif /* HAL_ADC_MODULE_ENABLED */
+
+#ifdef HAL_CAN_MODULE_ENABLED
+  #include "stm32f4xx_hal_can.h"
+#endif /* HAL_CAN_MODULE_ENABLED */
+
+#ifdef HAL_CRC_MODULE_ENABLED
+  #include "stm32f4xx_hal_crc.h"
+#endif /* HAL_CRC_MODULE_ENABLED */
+
+#ifdef HAL_CRYP_MODULE_ENABLED
+  #include "stm32f4xx_hal_cryp.h" 
+#endif /* HAL_CRYP_MODULE_ENABLED */
+
+#ifdef HAL_DMA2D_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma2d.h"
+#endif /* HAL_DMA2D_MODULE_ENABLED */
+
+#ifdef HAL_DAC_MODULE_ENABLED
+  #include "stm32f4xx_hal_dac.h"
+#endif /* HAL_DAC_MODULE_ENABLED */
+
+#ifdef HAL_DCMI_MODULE_ENABLED
+  #include "stm32f4xx_hal_dcmi.h"
+#endif /* HAL_DCMI_MODULE_ENABLED */
+
+#ifdef HAL_ETH_MODULE_ENABLED
+  #include "stm32f4xx_hal_eth.h"
+#endif /* HAL_ETH_MODULE_ENABLED */
+
+#ifdef HAL_FLASH_MODULE_ENABLED
+  #include "stm32f4xx_hal_flash.h"
+#endif /* HAL_FLASH_MODULE_ENABLED */
+ 
+#ifdef HAL_SRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sram.h"
+#endif /* HAL_SRAM_MODULE_ENABLED */
+
+#ifdef HAL_NOR_MODULE_ENABLED
+  #include "stm32f4xx_hal_nor.h"
+#endif /* HAL_NOR_MODULE_ENABLED */
+
+#ifdef HAL_NAND_MODULE_ENABLED
+  #include "stm32f4xx_hal_nand.h"
+#endif /* HAL_NAND_MODULE_ENABLED */
+
+#ifdef HAL_PCCARD_MODULE_ENABLED
+  #include "stm32f4xx_hal_pccard.h"
+#endif /* HAL_PCCARD_MODULE_ENABLED */ 
+  
+#ifdef HAL_SDRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sdram.h"
+#endif /* HAL_SDRAM_MODULE_ENABLED */      
+
+#ifdef HAL_HASH_MODULE_ENABLED
+ #include "stm32f4xx_hal_hash.h"
+#endif /* HAL_HASH_MODULE_ENABLED */
+
+#ifdef HAL_I2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2c.h"
+#endif /* HAL_I2C_MODULE_ENABLED */
+
+#ifdef HAL_I2S_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2s.h"
+#endif /* HAL_I2S_MODULE_ENABLED */
+
+#ifdef HAL_IWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_iwdg.h"
+#endif /* HAL_IWDG_MODULE_ENABLED */
+
+#ifdef HAL_LTDC_MODULE_ENABLED
+ #include "stm32f4xx_hal_ltdc.h"
+#endif /* HAL_LTDC_MODULE_ENABLED */
+
+#ifdef HAL_PWR_MODULE_ENABLED
+ #include "stm32f4xx_hal_pwr.h"
+#endif /* HAL_PWR_MODULE_ENABLED */
+
+#ifdef HAL_RNG_MODULE_ENABLED
+ #include "stm32f4xx_hal_rng.h"
+#endif /* HAL_RNG_MODULE_ENABLED */
+
+#ifdef HAL_RTC_MODULE_ENABLED
+ #include "stm32f4xx_hal_rtc.h"
+#endif /* HAL_RTC_MODULE_ENABLED */
+
+#ifdef HAL_SAI_MODULE_ENABLED
+ #include "stm32f4xx_hal_sai.h"
+#endif /* HAL_SAI_MODULE_ENABLED */
+
+#ifdef HAL_SD_MODULE_ENABLED
+ #include "stm32f4xx_hal_sd.h"
+#endif /* HAL_SD_MODULE_ENABLED */
+
+#ifdef HAL_MMC_MODULE_ENABLED
+ #include "stm32f4xx_hal_mmc.h"
+#endif /* HAL_MMC_MODULE_ENABLED */
+
+#ifdef HAL_SPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_spi.h"
+#endif /* HAL_SPI_MODULE_ENABLED */
+
+#ifdef HAL_TIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_tim.h"
+#endif /* HAL_TIM_MODULE_ENABLED */
+
+#ifdef HAL_UART_MODULE_ENABLED
+ #include "stm32f4xx_hal_uart.h"
+#endif /* HAL_UART_MODULE_ENABLED */
+
+#ifdef HAL_USART_MODULE_ENABLED
+ #include "stm32f4xx_hal_usart.h"
+#endif /* HAL_USART_MODULE_ENABLED */
+
+#ifdef HAL_IRDA_MODULE_ENABLED
+ #include "stm32f4xx_hal_irda.h"
+#endif /* HAL_IRDA_MODULE_ENABLED */
+
+#ifdef HAL_SMARTCARD_MODULE_ENABLED
+ #include "stm32f4xx_hal_smartcard.h"
+#endif /* HAL_SMARTCARD_MODULE_ENABLED */
+
+#ifdef HAL_WWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_wwdg.h"
+#endif /* HAL_WWDG_MODULE_ENABLED */
+
+#ifdef HAL_PCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_pcd.h"
+#endif /* HAL_PCD_MODULE_ENABLED */
+
+#ifdef HAL_HCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_hcd.h"
+#endif /* HAL_HCD_MODULE_ENABLED */
+   
+#ifdef HAL_DSI_MODULE_ENABLED
+ #include "stm32f4xx_hal_dsi.h"
+#endif /* HAL_DSI_MODULE_ENABLED */
+
+#ifdef HAL_QSPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_qspi.h"
+#endif /* HAL_QSPI_MODULE_ENABLED */
+
+#ifdef HAL_CEC_MODULE_ENABLED
+ #include "stm32f4xx_hal_cec.h"
+#endif /* HAL_CEC_MODULE_ENABLED */
+
+#ifdef HAL_FMPI2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_fmpi2c.h"
+#endif /* HAL_FMPI2C_MODULE_ENABLED */
+
+#ifdef HAL_SPDIFRX_MODULE_ENABLED
+ #include "stm32f4xx_hal_spdifrx.h"
+#endif /* HAL_SPDIFRX_MODULE_ENABLED */
+
+#ifdef HAL_DFSDM_MODULE_ENABLED
+ #include "stm32f4xx_hal_dfsdm.h"
+#endif /* HAL_DFSDM_MODULE_ENABLED */
+
+#ifdef HAL_LPTIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_lptim.h"
+#endif /* HAL_LPTIM_MODULE_ENABLED */
+   
+/* Exported macro ------------------------------------------------------------*/
+#ifdef  USE_FULL_ASSERT
+/**
+  * @brief  The assert_param macro is used for function's parameters check.
+  * @param  expr: If expr is false, it calls assert_failed function
+  *         which reports the name of the source file and the source
+  *         line number of the call that failed. 
+  *         If expr is true, it returns no value.
+  * @retval None
+  */
+  #define assert_param(expr) ((expr) ? (void)0U : assert_failed((uint8_t *)__FILE__, __LINE__))
+/* Exported functions ------------------------------------------------------- */
+  void assert_failed(uint8_t* file, uint32_t line);
+#else
+  #define assert_param(expr) ((void)0U)
+#endif /* USE_FULL_ASSERT */    
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __STM32F4xx_HAL_CONF_H */
+ 
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/ports/stm/boards/stm32f411ve_discovery/board.c b/ports/stm/boards/stm32f411ve_discovery/board.c
new file mode 100644
index 000000000..4421970ee
--- /dev/null
+++ b/ports/stm/boards/stm32f411ve_discovery/board.c
@@ -0,0 +1,38 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "boards/board.h"
+
+void board_init(void) {
+}
+
+bool board_requests_safe_mode(void) {
+  return false;
+}
+
+void reset_board(void) {
+
+}
diff --git a/ports/stm/boards/stm32f411ve_discovery/mpconfigboard.h b/ports/stm/boards/stm32f411ve_discovery/mpconfigboard.h
new file mode 100644
index 000000000..49ef80cdd
--- /dev/null
+++ b/ports/stm/boards/stm32f411ve_discovery/mpconfigboard.h
@@ -0,0 +1,35 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+//Micropython setup
+
+#define MICROPY_HW_BOARD_NAME       "STM32F411E_DISCO"
+#define MICROPY_HW_MCU_NAME         "STM32F411xE"
+
+#define FLASH_SIZE                  (0x80000) //512K
+#define FLASH_PAGE_SIZE             (0x4000)  //16K
+
+#define BOARD_OSC_DIV (8)
diff --git a/ports/stm/boards/stm32f411ve_discovery/mpconfigboard.mk b/ports/stm/boards/stm32f411ve_discovery/mpconfigboard.mk
new file mode 100644
index 000000000..64e2b4dc5
--- /dev/null
+++ b/ports/stm/boards/stm32f411ve_discovery/mpconfigboard.mk
@@ -0,0 +1,16 @@
+USB_VID = 0x239A
+USB_PID = 0x805E
+USB_PRODUCT = "STM32F411VE Discovery Board - CPy"
+USB_MANUFACTURER = "STMicroelectronics"
+USB_DEVICES = "CDC,MSC"
+
+INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL = NONE
+
+MCU_SERIES = m4
+MCU_VARIANT = stm32f4
+MCU_SUB_VARIANT = stm32f411xe
+MCU_PACKAGE = 100
+CMSIS_MCU = STM32F411xE
+LD_FILE = boards/STM32F411VETx_FLASH.ld
+
diff --git a/ports/stm/boards/stm32f411ve_discovery/pins.c b/ports/stm/boards/stm32f411ve_discovery/pins.c
new file mode 100644
index 000000000..673c412d5
--- /dev/null
+++ b/ports/stm/boards/stm32f411ve_discovery/pins.c
@@ -0,0 +1,106 @@
+#include "shared-bindings/board/__init__.h"
+
+STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
+  //P1
+  { MP_ROM_QSTR(MP_QSTR_PC00), MP_ROM_PTR(&pin_PC00) },
+  { MP_ROM_QSTR(MP_QSTR_PC01), MP_ROM_PTR(&pin_PC01) },
+  { MP_ROM_QSTR(MP_QSTR_PC02), MP_ROM_PTR(&pin_PC02) },
+  { MP_ROM_QSTR(MP_QSTR_PC03), MP_ROM_PTR(&pin_PC03) },
+  { MP_ROM_QSTR(MP_QSTR_PA00), MP_ROM_PTR(&pin_PA00) },
+  { MP_ROM_QSTR(MP_QSTR_PA01), MP_ROM_PTR(&pin_PA01) },
+  { MP_ROM_QSTR(MP_QSTR_PA02), MP_ROM_PTR(&pin_PA02) },
+  { MP_ROM_QSTR(MP_QSTR_PA03), MP_ROM_PTR(&pin_PA03) },
+  { MP_ROM_QSTR(MP_QSTR_PA04), MP_ROM_PTR(&pin_PA04) },
+  { MP_ROM_QSTR(MP_QSTR_PA05), MP_ROM_PTR(&pin_PA05) },
+  { MP_ROM_QSTR(MP_QSTR_PA06), MP_ROM_PTR(&pin_PA06) },
+  { MP_ROM_QSTR(MP_QSTR_PA07), MP_ROM_PTR(&pin_PA07) },
+  { MP_ROM_QSTR(MP_QSTR_PC04), MP_ROM_PTR(&pin_PC04) },
+  { MP_ROM_QSTR(MP_QSTR_PC05), MP_ROM_PTR(&pin_PC05) },
+  { MP_ROM_QSTR(MP_QSTR_PB00), MP_ROM_PTR(&pin_PB00) },
+  { MP_ROM_QSTR(MP_QSTR_PB01), MP_ROM_PTR(&pin_PB01) },
+  { MP_ROM_QSTR(MP_QSTR_PB02), MP_ROM_PTR(&pin_PB02) },
+  { MP_ROM_QSTR(MP_QSTR_PE07), MP_ROM_PTR(&pin_PE07) },
+  { MP_ROM_QSTR(MP_QSTR_PE08), MP_ROM_PTR(&pin_PE08) },
+  { MP_ROM_QSTR(MP_QSTR_PE09), MP_ROM_PTR(&pin_PE09) },
+  { MP_ROM_QSTR(MP_QSTR_PE10), MP_ROM_PTR(&pin_PE10) },
+  { MP_ROM_QSTR(MP_QSTR_PE11), MP_ROM_PTR(&pin_PE11) },
+  { MP_ROM_QSTR(MP_QSTR_PE12), MP_ROM_PTR(&pin_PE12) },
+  { MP_ROM_QSTR(MP_QSTR_PE13), MP_ROM_PTR(&pin_PE13) },
+  { MP_ROM_QSTR(MP_QSTR_PE14), MP_ROM_PTR(&pin_PE14) },
+  { MP_ROM_QSTR(MP_QSTR_PE15), MP_ROM_PTR(&pin_PE15) },
+  { MP_ROM_QSTR(MP_QSTR_PB10), MP_ROM_PTR(&pin_PB10) },
+  { MP_ROM_QSTR(MP_QSTR_PB12), MP_ROM_PTR(&pin_PB12) },
+  { MP_ROM_QSTR(MP_QSTR_PB13), MP_ROM_PTR(&pin_PB13) },
+  { MP_ROM_QSTR(MP_QSTR_PB14), MP_ROM_PTR(&pin_PB14) },
+  { MP_ROM_QSTR(MP_QSTR_PB15), MP_ROM_PTR(&pin_PB15) },
+  { MP_ROM_QSTR(MP_QSTR_PD08), MP_ROM_PTR(&pin_PD08) },
+  { MP_ROM_QSTR(MP_QSTR_PD09), MP_ROM_PTR(&pin_PD09) },
+  { MP_ROM_QSTR(MP_QSTR_PD10), MP_ROM_PTR(&pin_PD10) },
+  { MP_ROM_QSTR(MP_QSTR_PD11), MP_ROM_PTR(&pin_PD11) },
+  { MP_ROM_QSTR(MP_QSTR_PD12), MP_ROM_PTR(&pin_PD12) },
+  { MP_ROM_QSTR(MP_QSTR_PD13), MP_ROM_PTR(&pin_PD13) },
+  { MP_ROM_QSTR(MP_QSTR_PD14), MP_ROM_PTR(&pin_PD14) },
+  { MP_ROM_QSTR(MP_QSTR_PD15), MP_ROM_PTR(&pin_PD15) },
+  //P2
+  { MP_ROM_QSTR(MP_QSTR_PC14), MP_ROM_PTR(&pin_PC14) },
+  { MP_ROM_QSTR(MP_QSTR_PC15), MP_ROM_PTR(&pin_PC15) },
+  { MP_ROM_QSTR(MP_QSTR_PC13), MP_ROM_PTR(&pin_PC13) },
+  { MP_ROM_QSTR(MP_QSTR_PE06), MP_ROM_PTR(&pin_PE06) },
+  { MP_ROM_QSTR(MP_QSTR_PE05), MP_ROM_PTR(&pin_PE05) },
+  { MP_ROM_QSTR(MP_QSTR_PE04), MP_ROM_PTR(&pin_PE04) },
+  { MP_ROM_QSTR(MP_QSTR_PE03), MP_ROM_PTR(&pin_PE03) },
+  { MP_ROM_QSTR(MP_QSTR_PE02), MP_ROM_PTR(&pin_PE02) },
+  { MP_ROM_QSTR(MP_QSTR_PE01), MP_ROM_PTR(&pin_PE01) },
+  { MP_ROM_QSTR(MP_QSTR_PE00), MP_ROM_PTR(&pin_PE00) },
+  { MP_ROM_QSTR(MP_QSTR_PB09), MP_ROM_PTR(&pin_PB09) },
+  { MP_ROM_QSTR(MP_QSTR_PB08), MP_ROM_PTR(&pin_PB08) },
+  { MP_ROM_QSTR(MP_QSTR_PB07), MP_ROM_PTR(&pin_PB07) },
+  { MP_ROM_QSTR(MP_QSTR_PB06), MP_ROM_PTR(&pin_PB06) },
+  { MP_ROM_QSTR(MP_QSTR_PB05), MP_ROM_PTR(&pin_PB05) },
+  { MP_ROM_QSTR(MP_QSTR_PB04), MP_ROM_PTR(&pin_PB04) },
+  { MP_ROM_QSTR(MP_QSTR_PB03), MP_ROM_PTR(&pin_PB03) },
+  { MP_ROM_QSTR(MP_QSTR_PD07), MP_ROM_PTR(&pin_PD07) },
+  { MP_ROM_QSTR(MP_QSTR_PD06), MP_ROM_PTR(&pin_PD06) },
+  { MP_ROM_QSTR(MP_QSTR_PD05), MP_ROM_PTR(&pin_PD05) },
+  { MP_ROM_QSTR(MP_QSTR_PD04), MP_ROM_PTR(&pin_PD04) },
+  { MP_ROM_QSTR(MP_QSTR_PD03), MP_ROM_PTR(&pin_PD03) },
+  { MP_ROM_QSTR(MP_QSTR_PD02), MP_ROM_PTR(&pin_PD02) },
+  { MP_ROM_QSTR(MP_QSTR_PD01), MP_ROM_PTR(&pin_PD01) },
+  { MP_ROM_QSTR(MP_QSTR_PD00), MP_ROM_PTR(&pin_PD00) },
+  { MP_ROM_QSTR(MP_QSTR_PC12), MP_ROM_PTR(&pin_PC12) },
+  { MP_ROM_QSTR(MP_QSTR_PC11), MP_ROM_PTR(&pin_PC11) },
+  { MP_ROM_QSTR(MP_QSTR_PC10), MP_ROM_PTR(&pin_PC10) },
+  { MP_ROM_QSTR(MP_QSTR_PA15), MP_ROM_PTR(&pin_PA15) },
+  { MP_ROM_QSTR(MP_QSTR_PA14), MP_ROM_PTR(&pin_PA14) },
+  { MP_ROM_QSTR(MP_QSTR_PA13), MP_ROM_PTR(&pin_PA13) },
+  { MP_ROM_QSTR(MP_QSTR_PA10), MP_ROM_PTR(&pin_PA10) },
+  { MP_ROM_QSTR(MP_QSTR_PA09), MP_ROM_PTR(&pin_PA09) },
+  { MP_ROM_QSTR(MP_QSTR_PA08), MP_ROM_PTR(&pin_PA08) },
+  { MP_ROM_QSTR(MP_QSTR_PC09), MP_ROM_PTR(&pin_PC09) },
+  { MP_ROM_QSTR(MP_QSTR_PC08), MP_ROM_PTR(&pin_PC08) },
+  { MP_ROM_QSTR(MP_QSTR_PC07), MP_ROM_PTR(&pin_PC07) },
+  { MP_ROM_QSTR(MP_QSTR_PC06), MP_ROM_PTR(&pin_PC06) },
+  //ST LED names
+  { MP_ROM_QSTR(MP_QSTR_LD3), MP_ROM_PTR(&pin_PD13) },
+  { MP_ROM_QSTR(MP_QSTR_LD4), MP_ROM_PTR(&pin_PD12) },
+  { MP_ROM_QSTR(MP_QSTR_LD5), MP_ROM_PTR(&pin_PD14) },
+  { MP_ROM_QSTR(MP_QSTR_LD6), MP_ROM_PTR(&pin_PD15) },
+  //more useful LED names
+  { MP_ROM_QSTR(MP_QSTR_LED1), MP_ROM_PTR(&pin_PD13) },
+  { MP_ROM_QSTR(MP_QSTR_LED2), MP_ROM_PTR(&pin_PD12) },
+  { MP_ROM_QSTR(MP_QSTR_LED3), MP_ROM_PTR(&pin_PD14) },
+  { MP_ROM_QSTR(MP_QSTR_LED4), MP_ROM_PTR(&pin_PD15) },
+  //AnalogIO names
+  { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA00) },
+  { MP_ROM_QSTR(MP_QSTR_A1), MP_ROM_PTR(&pin_PA01) },
+  { MP_ROM_QSTR(MP_QSTR_A2), MP_ROM_PTR(&pin_PA02) },
+  { MP_ROM_QSTR(MP_QSTR_A3), MP_ROM_PTR(&pin_PA03) },
+  { MP_ROM_QSTR(MP_QSTR_A4), MP_ROM_PTR(&pin_PA04) },
+  { MP_ROM_QSTR(MP_QSTR_A5), MP_ROM_PTR(&pin_PA05) },
+  //actual LED names
+  { MP_ROM_QSTR(MP_QSTR_LED_ORANGE), MP_ROM_PTR(&pin_PD13) },
+  { MP_ROM_QSTR(MP_QSTR_LED_GREEN), MP_ROM_PTR(&pin_PD12) },
+  { MP_ROM_QSTR(MP_QSTR_LED_RED), MP_ROM_PTR(&pin_PD14) },
+  { MP_ROM_QSTR(MP_QSTR_LED_BLUE), MP_ROM_PTR(&pin_PD15) },
+};
+MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/stm/boards/stm32f411ve_discovery/stm32f4xx_hal_conf.h b/ports/stm/boards/stm32f411ve_discovery/stm32f4xx_hal_conf.h
new file mode 100644
index 000000000..18d9d60eb
--- /dev/null
+++ b/ports/stm/boards/stm32f411ve_discovery/stm32f4xx_hal_conf.h
@@ -0,0 +1,439 @@
+/**
+  ******************************************************************************
+  * @file    stm32f4xx_hal_conf_template.h
+  * @author  MCD Application Team
+  * @brief   HAL configuration template file. 
+  *          This file should be copied to the application folder and renamed
+  *          to stm32f4xx_hal_conf.h.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */ 
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __STM32F4xx_HAL_CONF_H
+#define __STM32F4xx_HAL_CONF_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+
+/* ########################## Module Selection ############################## */
+/**
+  * @brief This is the list of modules to be used in the HAL driver 
+  */
+#define HAL_MODULE_ENABLED  
+
+#define HAL_ADC_MODULE_ENABLED
+/* #define HAL_CRYP_MODULE_ENABLED   */
+/* #define HAL_CAN_MODULE_ENABLED   */
+/* #define HAL_CRC_MODULE_ENABLED   */
+/* #define HAL_CRYP_MODULE_ENABLED   */
+/* #define HAL_DAC_MODULE_ENABLED   */
+/* #define HAL_DCMI_MODULE_ENABLED   */
+/* #define HAL_DMA2D_MODULE_ENABLED   */
+/* #define HAL_ETH_MODULE_ENABLED   */
+/* #define HAL_NAND_MODULE_ENABLED   */
+/* #define HAL_NOR_MODULE_ENABLED   */
+/* #define HAL_PCCARD_MODULE_ENABLED   */
+/* #define HAL_SRAM_MODULE_ENABLED   */
+/* #define HAL_SDRAM_MODULE_ENABLED   */
+/* #define HAL_HASH_MODULE_ENABLED   */
+#define HAL_I2C_MODULE_ENABLED
+#define HAL_I2S_MODULE_ENABLED
+/* #define HAL_IWDG_MODULE_ENABLED   */
+/* #define HAL_LTDC_MODULE_ENABLED   */
+/* #define HAL_RNG_MODULE_ENABLED   */
+/* #define HAL_RTC_MODULE_ENABLED   */
+/* #define HAL_SAI_MODULE_ENABLED   */
+/* #define HAL_SD_MODULE_ENABLED   */
+/* #define HAL_MMC_MODULE_ENABLED   */
+#define HAL_SPI_MODULE_ENABLED
+#define HAL_TIM_MODULE_ENABLED
+#define HAL_UART_MODULE_ENABLED   
+/* #define HAL_USART_MODULE_ENABLED   */
+/* #define HAL_IRDA_MODULE_ENABLED   */
+/* #define HAL_SMARTCARD_MODULE_ENABLED   */
+/* #define HAL_WWDG_MODULE_ENABLED   */
+#define HAL_PCD_MODULE_ENABLED
+/* #define HAL_HCD_MODULE_ENABLED   */
+/* #define HAL_DSI_MODULE_ENABLED   */
+/* #define HAL_QSPI_MODULE_ENABLED   */
+/* #define HAL_QSPI_MODULE_ENABLED   */
+/* #define HAL_CEC_MODULE_ENABLED   */
+/* #define HAL_FMPI2C_MODULE_ENABLED   */
+/* #define HAL_SPDIFRX_MODULE_ENABLED   */
+/* #define HAL_DFSDM_MODULE_ENABLED   */
+/* #define HAL_LPTIM_MODULE_ENABLED   */
+/* #define HAL_EXTI_MODULE_ENABLED   */
+#define HAL_GPIO_MODULE_ENABLED
+#define HAL_EXTI_MODULE_ENABLED
+#define HAL_DMA_MODULE_ENABLED
+#define HAL_RCC_MODULE_ENABLED
+#define HAL_FLASH_MODULE_ENABLED
+#define HAL_PWR_MODULE_ENABLED
+#define HAL_CORTEX_MODULE_ENABLED
+
+/* ########################## HSE/HSI Values adaptation ##################### */
+/**
+  * @brief Adjust the value of External High Speed oscillator (HSE) used in your application.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSE is used as system clock source, directly or through the PLL).  
+  */
+#if !defined  (HSE_VALUE) 
+  #define HSE_VALUE    ((uint32_t)8000000U) /*!< Value of the External oscillator in Hz */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSE_STARTUP_TIMEOUT)
+  #define HSE_STARTUP_TIMEOUT    ((uint32_t)100U)   /*!< Time out for HSE start up, in ms */
+#endif /* HSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief Internal High Speed oscillator (HSI) value.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSI is used as system clock source, directly or through the PLL). 
+  */
+#if !defined  (HSI_VALUE)
+  #define HSI_VALUE    ((uint32_t)16000000U) /*!< Value of the Internal oscillator in Hz*/
+#endif /* HSI_VALUE */
+
+/**
+  * @brief Internal Low Speed oscillator (LSI) value.
+  */
+#if !defined  (LSI_VALUE) 
+ #define LSI_VALUE  ((uint32_t)32000U)       /*!< LSI Typical Value in Hz*/
+#endif /* LSI_VALUE */                      /*!< Value of the Internal Low Speed oscillator in Hz
+                                             The real value may vary depending on the variations
+                                             in voltage and temperature.*/
+/**
+  * @brief External Low Speed oscillator (LSE) value.
+  */
+#if !defined  (LSE_VALUE)
+ #define LSE_VALUE  ((uint32_t)32768U)    /*!< Value of the External Low Speed oscillator in Hz */
+#endif /* LSE_VALUE */
+
+#if !defined  (LSE_STARTUP_TIMEOUT)
+  #define LSE_STARTUP_TIMEOUT    ((uint32_t)5000U)   /*!< Time out for LSE start up, in ms */
+#endif /* LSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief External clock source for I2S peripheral
+  *        This value is used by the I2S HAL module to compute the I2S clock source 
+  *        frequency, this source is inserted directly through I2S_CKIN pad. 
+  */
+#if !defined  (EXTERNAL_CLOCK_VALUE)
+  #define EXTERNAL_CLOCK_VALUE    ((uint32_t)12288000U) /*!< Value of the External audio frequency in Hz*/
+#endif /* EXTERNAL_CLOCK_VALUE */
+
+/* Tip: To avoid modifying this file each time you need to use different HSE,
+   ===  you can define the HSE value in your toolchain compiler preprocessor. */
+
+/* ########################### System Configuration ######################### */
+/**
+  * @brief This is the HAL system configuration section
+  */
+#define  VDD_VALUE		      ((uint32_t)3300U) /*!< Value of VDD in mv */           
+#define  TICK_INT_PRIORITY            ((uint32_t)0U)   /*!< tick interrupt priority */            
+#define  USE_RTOS                     0U     
+#define  PREFETCH_ENABLE              1U
+#define  INSTRUCTION_CACHE_ENABLE     1U
+#define  DATA_CACHE_ENABLE            1U
+
+/* ########################## Assert Selection ############################## */
+/**
+  * @brief Uncomment the line below to expanse the "assert_param" macro in the 
+  *        HAL drivers code
+  */
+/* #define USE_FULL_ASSERT    1U */
+
+/* ################## Ethernet peripheral configuration ##################### */
+
+/* Section 1 : Ethernet peripheral configuration */
+
+/* MAC ADDRESS: MAC_ADDR0:MAC_ADDR1:MAC_ADDR2:MAC_ADDR3:MAC_ADDR4:MAC_ADDR5 */
+#define MAC_ADDR0   2U
+#define MAC_ADDR1   0U
+#define MAC_ADDR2   0U
+#define MAC_ADDR3   0U
+#define MAC_ADDR4   0U
+#define MAC_ADDR5   0U
+
+/* Definition of the Ethernet driver buffers size and count */   
+#define ETH_RX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for receive               */
+#define ETH_TX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for transmit              */
+#define ETH_RXBUFNB                    ((uint32_t)4U)       /* 4 Rx buffers of size ETH_RX_BUF_SIZE  */
+#define ETH_TXBUFNB                    ((uint32_t)4U)       /* 4 Tx buffers of size ETH_TX_BUF_SIZE  */
+
+/* Section 2: PHY configuration section */
+
+/* DP83848_PHY_ADDRESS Address*/ 
+#define DP83848_PHY_ADDRESS           0x01U
+/* PHY Reset delay these values are based on a 1 ms Systick interrupt*/ 
+#define PHY_RESET_DELAY                 ((uint32_t)0x000000FFU)
+/* PHY Configuration delay */
+#define PHY_CONFIG_DELAY                ((uint32_t)0x00000FFFU)
+
+#define PHY_READ_TO                     ((uint32_t)0x0000FFFFU)
+#define PHY_WRITE_TO                    ((uint32_t)0x0000FFFFU)
+
+/* Section 3: Common PHY Registers */
+
+#define PHY_BCR                         ((uint16_t)0x0000U)    /*!< Transceiver Basic Control Register   */
+#define PHY_BSR                         ((uint16_t)0x0001U)    /*!< Transceiver Basic Status Register    */
+ 
+#define PHY_RESET                       ((uint16_t)0x8000U)  /*!< PHY Reset */
+#define PHY_LOOPBACK                    ((uint16_t)0x4000U)  /*!< Select loop-back mode */
+#define PHY_FULLDUPLEX_100M             ((uint16_t)0x2100U)  /*!< Set the full-duplex mode at 100 Mb/s */
+#define PHY_HALFDUPLEX_100M             ((uint16_t)0x2000U)  /*!< Set the half-duplex mode at 100 Mb/s */
+#define PHY_FULLDUPLEX_10M              ((uint16_t)0x0100U)  /*!< Set the full-duplex mode at 10 Mb/s  */
+#define PHY_HALFDUPLEX_10M              ((uint16_t)0x0000U)  /*!< Set the half-duplex mode at 10 Mb/s  */
+#define PHY_AUTONEGOTIATION             ((uint16_t)0x1000U)  /*!< Enable auto-negotiation function     */
+#define PHY_RESTART_AUTONEGOTIATION     ((uint16_t)0x0200U)  /*!< Restart auto-negotiation function    */
+#define PHY_POWERDOWN                   ((uint16_t)0x0800U)  /*!< Select the power down mode           */
+#define PHY_ISOLATE                     ((uint16_t)0x0400U)  /*!< Isolate PHY from MII                 */
+
+#define PHY_AUTONEGO_COMPLETE           ((uint16_t)0x0020U)  /*!< Auto-Negotiation process completed   */
+#define PHY_LINKED_STATUS               ((uint16_t)0x0004U)  /*!< Valid link established               */
+#define PHY_JABBER_DETECTION            ((uint16_t)0x0002U)  /*!< Jabber condition detected            */
+  
+/* Section 4: Extended PHY Registers */
+#define PHY_SR                          ((uint16_t)0x10U)    /*!< PHY status register Offset                      */
+
+#define PHY_SPEED_STATUS                ((uint16_t)0x0002U)  /*!< PHY Speed mask                                  */
+#define PHY_DUPLEX_STATUS               ((uint16_t)0x0004U)  /*!< PHY Duplex mask                                 */
+
+/* ################## SPI peripheral configuration ########################## */
+
+/* CRC FEATURE: Use to activate CRC feature inside HAL SPI Driver
+* Activated: CRC code is present inside driver
+* Deactivated: CRC code cleaned from driver
+*/
+
+#define USE_SPI_CRC                     0U
+
+/* Includes ------------------------------------------------------------------*/
+/**
+  * @brief Include module's header file 
+  */
+
+#ifdef HAL_RCC_MODULE_ENABLED
+  #include "stm32f4xx_hal_rcc.h"
+#endif /* HAL_RCC_MODULE_ENABLED */
+
+#ifdef HAL_EXTI_MODULE_ENABLED
+  #include "stm32f4xx_hal_exti.h"
+#endif /* HAL_EXTI_MODULE_ENABLED */
+
+#ifdef HAL_GPIO_MODULE_ENABLED
+  #include "stm32f4xx_hal_gpio.h"
+#endif /* HAL_GPIO_MODULE_ENABLED */
+
+#ifdef HAL_DMA_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma.h"
+#endif /* HAL_DMA_MODULE_ENABLED */
+   
+#ifdef HAL_CORTEX_MODULE_ENABLED
+  #include "stm32f4xx_hal_cortex.h"
+#endif /* HAL_CORTEX_MODULE_ENABLED */
+
+#ifdef HAL_ADC_MODULE_ENABLED
+  #include "stm32f4xx_hal_adc.h"
+#endif /* HAL_ADC_MODULE_ENABLED */
+
+#ifdef HAL_CAN_MODULE_ENABLED
+  #include "stm32f4xx_hal_can.h"
+#endif /* HAL_CAN_MODULE_ENABLED */
+
+#ifdef HAL_CRC_MODULE_ENABLED
+  #include "stm32f4xx_hal_crc.h"
+#endif /* HAL_CRC_MODULE_ENABLED */
+
+#ifdef HAL_CRYP_MODULE_ENABLED
+  #include "stm32f4xx_hal_cryp.h" 
+#endif /* HAL_CRYP_MODULE_ENABLED */
+
+#ifdef HAL_DMA2D_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma2d.h"
+#endif /* HAL_DMA2D_MODULE_ENABLED */
+
+#ifdef HAL_DAC_MODULE_ENABLED
+  #include "stm32f4xx_hal_dac.h"
+#endif /* HAL_DAC_MODULE_ENABLED */
+
+#ifdef HAL_DCMI_MODULE_ENABLED
+  #include "stm32f4xx_hal_dcmi.h"
+#endif /* HAL_DCMI_MODULE_ENABLED */
+
+#ifdef HAL_ETH_MODULE_ENABLED
+  #include "stm32f4xx_hal_eth.h"
+#endif /* HAL_ETH_MODULE_ENABLED */
+
+#ifdef HAL_FLASH_MODULE_ENABLED
+  #include "stm32f4xx_hal_flash.h"
+#endif /* HAL_FLASH_MODULE_ENABLED */
+ 
+#ifdef HAL_SRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sram.h"
+#endif /* HAL_SRAM_MODULE_ENABLED */
+
+#ifdef HAL_NOR_MODULE_ENABLED
+  #include "stm32f4xx_hal_nor.h"
+#endif /* HAL_NOR_MODULE_ENABLED */
+
+#ifdef HAL_NAND_MODULE_ENABLED
+  #include "stm32f4xx_hal_nand.h"
+#endif /* HAL_NAND_MODULE_ENABLED */
+
+#ifdef HAL_PCCARD_MODULE_ENABLED
+  #include "stm32f4xx_hal_pccard.h"
+#endif /* HAL_PCCARD_MODULE_ENABLED */ 
+  
+#ifdef HAL_SDRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sdram.h"
+#endif /* HAL_SDRAM_MODULE_ENABLED */      
+
+#ifdef HAL_HASH_MODULE_ENABLED
+ #include "stm32f4xx_hal_hash.h"
+#endif /* HAL_HASH_MODULE_ENABLED */
+
+#ifdef HAL_I2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2c.h"
+#endif /* HAL_I2C_MODULE_ENABLED */
+
+#ifdef HAL_I2S_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2s.h"
+#endif /* HAL_I2S_MODULE_ENABLED */
+
+#ifdef HAL_IWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_iwdg.h"
+#endif /* HAL_IWDG_MODULE_ENABLED */
+
+#ifdef HAL_LTDC_MODULE_ENABLED
+ #include "stm32f4xx_hal_ltdc.h"
+#endif /* HAL_LTDC_MODULE_ENABLED */
+
+#ifdef HAL_PWR_MODULE_ENABLED
+ #include "stm32f4xx_hal_pwr.h"
+#endif /* HAL_PWR_MODULE_ENABLED */
+
+#ifdef HAL_RNG_MODULE_ENABLED
+ #include "stm32f4xx_hal_rng.h"
+#endif /* HAL_RNG_MODULE_ENABLED */
+
+#ifdef HAL_RTC_MODULE_ENABLED
+ #include "stm32f4xx_hal_rtc.h"
+#endif /* HAL_RTC_MODULE_ENABLED */
+
+#ifdef HAL_SAI_MODULE_ENABLED
+ #include "stm32f4xx_hal_sai.h"
+#endif /* HAL_SAI_MODULE_ENABLED */
+
+#ifdef HAL_SD_MODULE_ENABLED
+ #include "stm32f4xx_hal_sd.h"
+#endif /* HAL_SD_MODULE_ENABLED */
+
+#ifdef HAL_MMC_MODULE_ENABLED
+ #include "stm32f4xx_hal_mmc.h"
+#endif /* HAL_MMC_MODULE_ENABLED */
+
+#ifdef HAL_SPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_spi.h"
+#endif /* HAL_SPI_MODULE_ENABLED */
+
+#ifdef HAL_TIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_tim.h"
+#endif /* HAL_TIM_MODULE_ENABLED */
+
+#ifdef HAL_UART_MODULE_ENABLED
+ #include "stm32f4xx_hal_uart.h"
+#endif /* HAL_UART_MODULE_ENABLED */
+
+#ifdef HAL_USART_MODULE_ENABLED
+ #include "stm32f4xx_hal_usart.h"
+#endif /* HAL_USART_MODULE_ENABLED */
+
+#ifdef HAL_IRDA_MODULE_ENABLED
+ #include "stm32f4xx_hal_irda.h"
+#endif /* HAL_IRDA_MODULE_ENABLED */
+
+#ifdef HAL_SMARTCARD_MODULE_ENABLED
+ #include "stm32f4xx_hal_smartcard.h"
+#endif /* HAL_SMARTCARD_MODULE_ENABLED */
+
+#ifdef HAL_WWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_wwdg.h"
+#endif /* HAL_WWDG_MODULE_ENABLED */
+
+#ifdef HAL_PCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_pcd.h"
+#endif /* HAL_PCD_MODULE_ENABLED */
+
+#ifdef HAL_HCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_hcd.h"
+#endif /* HAL_HCD_MODULE_ENABLED */
+   
+#ifdef HAL_DSI_MODULE_ENABLED
+ #include "stm32f4xx_hal_dsi.h"
+#endif /* HAL_DSI_MODULE_ENABLED */
+
+#ifdef HAL_QSPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_qspi.h"
+#endif /* HAL_QSPI_MODULE_ENABLED */
+
+#ifdef HAL_CEC_MODULE_ENABLED
+ #include "stm32f4xx_hal_cec.h"
+#endif /* HAL_CEC_MODULE_ENABLED */
+
+#ifdef HAL_FMPI2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_fmpi2c.h"
+#endif /* HAL_FMPI2C_MODULE_ENABLED */
+
+#ifdef HAL_SPDIFRX_MODULE_ENABLED
+ #include "stm32f4xx_hal_spdifrx.h"
+#endif /* HAL_SPDIFRX_MODULE_ENABLED */
+
+#ifdef HAL_DFSDM_MODULE_ENABLED
+ #include "stm32f4xx_hal_dfsdm.h"
+#endif /* HAL_DFSDM_MODULE_ENABLED */
+
+#ifdef HAL_LPTIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_lptim.h"
+#endif /* HAL_LPTIM_MODULE_ENABLED */
+   
+/* Exported macro ------------------------------------------------------------*/
+#ifdef  USE_FULL_ASSERT
+/**
+  * @brief  The assert_param macro is used for function's parameters check.
+  * @param  expr: If expr is false, it calls assert_failed function
+  *         which reports the name of the source file and the source
+  *         line number of the call that failed. 
+  *         If expr is true, it returns no value.
+  * @retval None
+  */
+  #define assert_param(expr) ((expr) ? (void)0U : assert_failed((uint8_t *)__FILE__, __LINE__))
+/* Exported functions ------------------------------------------------------- */
+  void assert_failed(uint8_t* file, uint32_t line);
+#else
+  #define assert_param(expr) ((void)0U)
+#endif /* USE_FULL_ASSERT */    
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __STM32F4xx_HAL_CONF_H */
+ 
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/ports/stm/boards/stm32f412zg_discovery/board.c b/ports/stm/boards/stm32f412zg_discovery/board.c
new file mode 100644
index 000000000..4421970ee
--- /dev/null
+++ b/ports/stm/boards/stm32f412zg_discovery/board.c
@@ -0,0 +1,38 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "boards/board.h"
+
+void board_init(void) {
+}
+
+bool board_requests_safe_mode(void) {
+  return false;
+}
+
+void reset_board(void) {
+
+}
diff --git a/ports/stm/boards/stm32f412zg_discovery/mpconfigboard.h b/ports/stm/boards/stm32f412zg_discovery/mpconfigboard.h
new file mode 100644
index 000000000..f34b830fb
--- /dev/null
+++ b/ports/stm/boards/stm32f412zg_discovery/mpconfigboard.h
@@ -0,0 +1,38 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+//Micropython setup
+
+#define MICROPY_HW_BOARD_NAME       "STM32F412G_DISCO"
+#define MICROPY_HW_MCU_NAME         "STM32F412xGS"
+
+#define FLASH_SIZE                  (0x100000)
+#define FLASH_PAGE_SIZE             (0x4000)
+
+#define BOARD_OSC_DIV (8)
+
+#define DEFAULT_I2C_BUS_SCL (&pin_PB10)
+#define DEFAULT_I2C_BUS_SDA (&pin_PB09)
diff --git a/ports/stm/boards/stm32f412zg_discovery/mpconfigboard.mk b/ports/stm/boards/stm32f412zg_discovery/mpconfigboard.mk
new file mode 100644
index 000000000..b0205fc73
--- /dev/null
+++ b/ports/stm/boards/stm32f412zg_discovery/mpconfigboard.mk
@@ -0,0 +1,22 @@
+USB_VID = 0x239A
+USB_PID = 0x8056
+USB_PRODUCT = "STM32F412ZG Discovery Board - CPy"
+USB_MANUFACTURER = "STMicroelectronics"
+USB_DEVICES = "CDC,MSC,HID"
+
+INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL = NONE
+
+# QSPI_FLASH_FILESYSTEM = 1
+# EXTERNAL_FLASH_DEVICE_COUNT = 1
+# EXTERNAL_FLASH_DEVICES = N25Q128A
+# LONGINT_IMPL = MPZ
+
+MCU_SERIES = m4
+MCU_VARIANT = stm32f4
+MCU_SUB_VARIANT = stm32f412zx
+MCU_PACKAGE = 144
+CMSIS_MCU = STM32F412Zx
+LD_FILE = boards/STM32F412ZGTx_FLASH.ld
+
+
diff --git a/ports/stm/boards/stm32f412zg_discovery/pins.c b/ports/stm/boards/stm32f412zg_discovery/pins.c
new file mode 100644
index 000000000..ab90b0455
--- /dev/null
+++ b/ports/stm/boards/stm32f412zg_discovery/pins.c
@@ -0,0 +1,94 @@
+#include "shared-bindings/board/__init__.h"
+
+STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
+  { MP_ROM_QSTR(MP_QSTR_PE02), MP_ROM_PTR(&pin_PE02) },
+  { MP_ROM_QSTR(MP_QSTR_PE03), MP_ROM_PTR(&pin_PE03) },
+  { MP_ROM_QSTR(MP_QSTR_PE04), MP_ROM_PTR(&pin_PE04) },
+  { MP_ROM_QSTR(MP_QSTR_PE05), MP_ROM_PTR(&pin_PE05) },
+  { MP_ROM_QSTR(MP_QSTR_PE06), MP_ROM_PTR(&pin_PE06) },
+  { MP_ROM_QSTR(MP_QSTR_PC13), MP_ROM_PTR(&pin_PC13) },
+  { MP_ROM_QSTR(MP_QSTR_PF02), MP_ROM_PTR(&pin_PF02) },
+  { MP_ROM_QSTR(MP_QSTR_PF03), MP_ROM_PTR(&pin_PF03) },
+  { MP_ROM_QSTR(MP_QSTR_PF10), MP_ROM_PTR(&pin_PF10) },
+  { MP_ROM_QSTR(MP_QSTR_PC00), MP_ROM_PTR(&pin_PC00) },
+  { MP_ROM_QSTR(MP_QSTR_PC01), MP_ROM_PTR(&pin_PC01) },
+  { MP_ROM_QSTR(MP_QSTR_PC02), MP_ROM_PTR(&pin_PC02) },
+  { MP_ROM_QSTR(MP_QSTR_PC03), MP_ROM_PTR(&pin_PC03) },
+  { MP_ROM_QSTR(MP_QSTR_PA01), MP_ROM_PTR(&pin_PA01) },
+  { MP_ROM_QSTR(MP_QSTR_PA02), MP_ROM_PTR(&pin_PA02) },
+  { MP_ROM_QSTR(MP_QSTR_PA03), MP_ROM_PTR(&pin_PA03) },
+  { MP_ROM_QSTR(MP_QSTR_PA04), MP_ROM_PTR(&pin_PA04) },
+  { MP_ROM_QSTR(MP_QSTR_PA05), MP_ROM_PTR(&pin_PA05) },
+  { MP_ROM_QSTR(MP_QSTR_PA06), MP_ROM_PTR(&pin_PA06) },
+  { MP_ROM_QSTR(MP_QSTR_PA07), MP_ROM_PTR(&pin_PA07) },
+  { MP_ROM_QSTR(MP_QSTR_PC04), MP_ROM_PTR(&pin_PC04) },
+  { MP_ROM_QSTR(MP_QSTR_PC05), MP_ROM_PTR(&pin_PC05) },
+  { MP_ROM_QSTR(MP_QSTR_PB00), MP_ROM_PTR(&pin_PB00) },
+  { MP_ROM_QSTR(MP_QSTR_PB01), MP_ROM_PTR(&pin_PB01) },
+  { MP_ROM_QSTR(MP_QSTR_PF11), MP_ROM_PTR(&pin_PF11) },
+  { MP_ROM_QSTR(MP_QSTR_PF13), MP_ROM_PTR(&pin_PF13) },
+  { MP_ROM_QSTR(MP_QSTR_PB10), MP_ROM_PTR(&pin_PB10) },
+  { MP_ROM_QSTR(MP_QSTR_PB11), MP_ROM_PTR(&pin_PB11) },
+  { MP_ROM_QSTR(MP_QSTR_PB12), MP_ROM_PTR(&pin_PB12) },
+  { MP_ROM_QSTR(MP_QSTR_PB13), MP_ROM_PTR(&pin_PB13) },
+  { MP_ROM_QSTR(MP_QSTR_PB14), MP_ROM_PTR(&pin_PB14) },
+  { MP_ROM_QSTR(MP_QSTR_PB15), MP_ROM_PTR(&pin_PB15) },
+  { MP_ROM_QSTR(MP_QSTR_PD12), MP_ROM_PTR(&pin_PD12) },
+  { MP_ROM_QSTR(MP_QSTR_PD13), MP_ROM_PTR(&pin_PD13) },
+  { MP_ROM_QSTR(MP_QSTR_PG02), MP_ROM_PTR(&pin_PG02) },
+  { MP_ROM_QSTR(MP_QSTR_PC06), MP_ROM_PTR(&pin_PC06) },
+  { MP_ROM_QSTR(MP_QSTR_PC07), MP_ROM_PTR(&pin_PC07) },
+  { MP_ROM_QSTR(MP_QSTR_PC09), MP_ROM_PTR(&pin_PC09) },
+  { MP_ROM_QSTR(MP_QSTR_PA08), MP_ROM_PTR(&pin_PA08) },
+  { MP_ROM_QSTR(MP_QSTR_PA10), MP_ROM_PTR(&pin_PA10) },
+  { MP_ROM_QSTR(MP_QSTR_PA13), MP_ROM_PTR(&pin_PA13) },
+  { MP_ROM_QSTR(MP_QSTR_PA14), MP_ROM_PTR(&pin_PA14) },
+  { MP_ROM_QSTR(MP_QSTR_PA15), MP_ROM_PTR(&pin_PA15) },
+  { MP_ROM_QSTR(MP_QSTR_PD06), MP_ROM_PTR(&pin_PD06) },
+  { MP_ROM_QSTR(MP_QSTR_PG09), MP_ROM_PTR(&pin_PG09) },
+  { MP_ROM_QSTR(MP_QSTR_PG10), MP_ROM_PTR(&pin_PG10) },
+  { MP_ROM_QSTR(MP_QSTR_PG11), MP_ROM_PTR(&pin_PG11) },
+  { MP_ROM_QSTR(MP_QSTR_PG12), MP_ROM_PTR(&pin_PG12) },
+  { MP_ROM_QSTR(MP_QSTR_PG13), MP_ROM_PTR(&pin_PG13) },
+  { MP_ROM_QSTR(MP_QSTR_PG14), MP_ROM_PTR(&pin_PG14) },
+  { MP_ROM_QSTR(MP_QSTR_PB03), MP_ROM_PTR(&pin_PB03) },
+  { MP_ROM_QSTR(MP_QSTR_PB04), MP_ROM_PTR(&pin_PB04) },
+  { MP_ROM_QSTR(MP_QSTR_PB05), MP_ROM_PTR(&pin_PB05) },
+  { MP_ROM_QSTR(MP_QSTR_PB06), MP_ROM_PTR(&pin_PB06) },
+  { MP_ROM_QSTR(MP_QSTR_PB07), MP_ROM_PTR(&pin_PB07) },
+  { MP_ROM_QSTR(MP_QSTR_PB08), MP_ROM_PTR(&pin_PB08) },
+  { MP_ROM_QSTR(MP_QSTR_PB09), MP_ROM_PTR(&pin_PB09) },
+  { MP_ROM_QSTR(MP_QSTR_PE00), MP_ROM_PTR(&pin_PE00) },
+  { MP_ROM_QSTR(MP_QSTR_PE01), MP_ROM_PTR(&pin_PE01) },
+  { MP_ROM_QSTR(MP_QSTR_D15), MP_ROM_PTR(&pin_PB10) },
+  { MP_ROM_QSTR(MP_QSTR_D14), MP_ROM_PTR(&pin_PB09) },
+  { MP_ROM_QSTR(MP_QSTR_D13), MP_ROM_PTR(&pin_PA05) },
+  { MP_ROM_QSTR(MP_QSTR_D12), MP_ROM_PTR(&pin_PA06) },
+  { MP_ROM_QSTR(MP_QSTR_D11), MP_ROM_PTR(&pin_PA07) },
+  { MP_ROM_QSTR(MP_QSTR_D10), MP_ROM_PTR(&pin_PA15) },
+  { MP_ROM_QSTR(MP_QSTR_D9), MP_ROM_PTR(&pin_PB08) },
+  { MP_ROM_QSTR(MP_QSTR_D8), MP_ROM_PTR(&pin_PG10) },
+  { MP_ROM_QSTR(MP_QSTR_D7), MP_ROM_PTR(&pin_PG11) },
+  { MP_ROM_QSTR(MP_QSTR_D6), MP_ROM_PTR(&pin_PF03) },
+  { MP_ROM_QSTR(MP_QSTR_D5), MP_ROM_PTR(&pin_PF10) },
+  { MP_ROM_QSTR(MP_QSTR_D4), MP_ROM_PTR(&pin_PG12) },
+  { MP_ROM_QSTR(MP_QSTR_D3), MP_ROM_PTR(&pin_PF04) },
+  { MP_ROM_QSTR(MP_QSTR_D2), MP_ROM_PTR(&pin_PG13) },
+  { MP_ROM_QSTR(MP_QSTR_D1), MP_ROM_PTR(&pin_PG14) }, //USART6 TX
+  { MP_ROM_QSTR(MP_QSTR_D0), MP_ROM_PTR(&pin_PG09) }, //USART6 RX
+  { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA01) },
+  { MP_ROM_QSTR(MP_QSTR_A1), MP_ROM_PTR(&pin_PC01) },
+  { MP_ROM_QSTR(MP_QSTR_A2), MP_ROM_PTR(&pin_PC03) },
+  { MP_ROM_QSTR(MP_QSTR_A3), MP_ROM_PTR(&pin_PC04) },
+  { MP_ROM_QSTR(MP_QSTR_A4), MP_ROM_PTR(&pin_PC05) }, //alt PB09, see F401ZG-DISCO manual
+  { MP_ROM_QSTR(MP_QSTR_A5), MP_ROM_PTR(&pin_PB00) }, //alt PB10, see F401ZG-DISCO manual
+  { MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_PB10) },
+  { MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_PB09) },
+  { MP_ROM_QSTR(MP_QSTR_LED1), MP_ROM_PTR(&pin_PE00) },
+  { MP_ROM_QSTR(MP_QSTR_LED2), MP_ROM_PTR(&pin_PE01) },
+  { MP_ROM_QSTR(MP_QSTR_LED3), MP_ROM_PTR(&pin_PE02) },
+  { MP_ROM_QSTR(MP_QSTR_LED4), MP_ROM_PTR(&pin_PE03) },
+
+  { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+};
+MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/stm/boards/stm32f412zg_discovery/stm32f4xx_hal_conf.h b/ports/stm/boards/stm32f412zg_discovery/stm32f4xx_hal_conf.h
new file mode 100644
index 000000000..f1b401348
--- /dev/null
+++ b/ports/stm/boards/stm32f412zg_discovery/stm32f4xx_hal_conf.h
@@ -0,0 +1,438 @@
+/**
+  ******************************************************************************
+  * @file    stm32f4xx_hal_conf_template.h
+  * @author  MCD Application Team
+  * @brief   HAL configuration template file. 
+  *          This file should be copied to the application folder and renamed
+  *          to stm32f4xx_hal_conf.h.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */ 
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __STM32F4xx_HAL_CONF_H
+#define __STM32F4xx_HAL_CONF_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+
+/* ########################## Module Selection ############################## */
+/**
+  * @brief This is the list of modules to be used in the HAL driver 
+  */
+#define HAL_MODULE_ENABLED  
+
+#define HAL_ADC_MODULE_ENABLED
+/* #define HAL_CRYP_MODULE_ENABLED   */
+/* #define HAL_CAN_MODULE_ENABLED   */
+/* #define HAL_CRC_MODULE_ENABLED   */
+/* #define HAL_CRYP_MODULE_ENABLED   */
+/* #define HAL_DAC_MODULE_ENABLED   */
+/* #define HAL_DCMI_MODULE_ENABLED   */
+/* #define HAL_DMA2D_MODULE_ENABLED   */
+/* #define HAL_ETH_MODULE_ENABLED   */
+/* #define HAL_NAND_MODULE_ENABLED   */
+/* #define HAL_NOR_MODULE_ENABLED   */
+/* #define HAL_PCCARD_MODULE_ENABLED   */
+#define HAL_SRAM_MODULE_ENABLED
+/* #define HAL_SDRAM_MODULE_ENABLED   */
+/* #define HAL_HASH_MODULE_ENABLED   */
+#define HAL_I2C_MODULE_ENABLED
+#define HAL_I2S_MODULE_ENABLED
+/* #define HAL_IWDG_MODULE_ENABLED   */
+/* #define HAL_LTDC_MODULE_ENABLED   */
+#define HAL_RNG_MODULE_ENABLED
+/* #define HAL_RTC_MODULE_ENABLED   */
+/* #define HAL_SAI_MODULE_ENABLED   */
+#define HAL_SD_MODULE_ENABLED
+/* #define HAL_MMC_MODULE_ENABLED   */
+#define HAL_SPI_MODULE_ENABLED
+#define HAL_TIM_MODULE_ENABLED
+#define HAL_UART_MODULE_ENABLED
+/* #define HAL_USART_MODULE_ENABLED   */
+/* #define HAL_IRDA_MODULE_ENABLED   */
+/* #define HAL_SMARTCARD_MODULE_ENABLED   */
+/* #define HAL_WWDG_MODULE_ENABLED   */
+#define HAL_PCD_MODULE_ENABLED
+/* #define HAL_HCD_MODULE_ENABLED   */
+/* #define HAL_DSI_MODULE_ENABLED   */
+#define HAL_QSPI_MODULE_ENABLED
+/* #define HAL_CEC_MODULE_ENABLED   */
+/* #define HAL_FMPI2C_MODULE_ENABLED   */
+/* #define HAL_SPDIFRX_MODULE_ENABLED   */
+/* #define HAL_DFSDM_MODULE_ENABLED   */
+/* #define HAL_LPTIM_MODULE_ENABLED   */
+/* #define HAL_EXTI_MODULE_ENABLED   */
+#define HAL_GPIO_MODULE_ENABLED
+#define HAL_EXTI_MODULE_ENABLED
+#define HAL_DMA_MODULE_ENABLED
+#define HAL_RCC_MODULE_ENABLED
+#define HAL_FLASH_MODULE_ENABLED
+#define HAL_PWR_MODULE_ENABLED
+#define HAL_CORTEX_MODULE_ENABLED
+
+/* ########################## HSE/HSI Values adaptation ##################### */
+/**
+  * @brief Adjust the value of External High Speed oscillator (HSE) used in your application.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSE is used as system clock source, directly or through the PLL).  
+  */
+#if !defined  (HSE_VALUE) 
+  #define HSE_VALUE    ((uint32_t)8000000U) /*!< Value of the External oscillator in Hz */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSE_STARTUP_TIMEOUT)
+  #define HSE_STARTUP_TIMEOUT    ((uint32_t)100U)   /*!< Time out for HSE start up, in ms */
+#endif /* HSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief Internal High Speed oscillator (HSI) value.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSI is used as system clock source, directly or through the PLL). 
+  */
+#if !defined  (HSI_VALUE)
+  #define HSI_VALUE    ((uint32_t)16000000U) /*!< Value of the Internal oscillator in Hz*/
+#endif /* HSI_VALUE */
+
+/**
+  * @brief Internal Low Speed oscillator (LSI) value.
+  */
+#if !defined  (LSI_VALUE) 
+ #define LSI_VALUE  ((uint32_t)32000U)       /*!< LSI Typical Value in Hz*/
+#endif /* LSI_VALUE */                      /*!< Value of the Internal Low Speed oscillator in Hz
+                                             The real value may vary depending on the variations
+                                             in voltage and temperature.*/
+/**
+  * @brief External Low Speed oscillator (LSE) value.
+  */
+#if !defined  (LSE_VALUE)
+ #define LSE_VALUE  ((uint32_t)32768U)    /*!< Value of the External Low Speed oscillator in Hz */
+#endif /* LSE_VALUE */
+
+#if !defined  (LSE_STARTUP_TIMEOUT)
+  #define LSE_STARTUP_TIMEOUT    ((uint32_t)5000U)   /*!< Time out for LSE start up, in ms */
+#endif /* LSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief External clock source for I2S peripheral
+  *        This value is used by the I2S HAL module to compute the I2S clock source 
+  *        frequency, this source is inserted directly through I2S_CKIN pad. 
+  */
+#if !defined  (EXTERNAL_CLOCK_VALUE)
+  #define EXTERNAL_CLOCK_VALUE    ((uint32_t)12288000U) /*!< Value of the External audio frequency in Hz*/
+#endif /* EXTERNAL_CLOCK_VALUE */
+
+/* Tip: To avoid modifying this file each time you need to use different HSE,
+   ===  you can define the HSE value in your toolchain compiler preprocessor. */
+
+/* ########################### System Configuration ######################### */
+/**
+  * @brief This is the HAL system configuration section
+  */
+#define  VDD_VALUE          ((uint32_t)3300U) /*!< Value of VDD in mv */           
+#define  TICK_INT_PRIORITY            ((uint32_t)0U)   /*!< tick interrupt priority */            
+#define  USE_RTOS                     0U     
+#define  PREFETCH_ENABLE              1U
+#define  INSTRUCTION_CACHE_ENABLE     1U
+#define  DATA_CACHE_ENABLE            1U
+
+/* ########################## Assert Selection ############################## */
+/**
+  * @brief Uncomment the line below to expanse the "assert_param" macro in the 
+  *        HAL drivers code
+  */
+/* #define USE_FULL_ASSERT    1U */
+
+/* ################## Ethernet peripheral configuration ##################### */
+
+/* Section 1 : Ethernet peripheral configuration */
+
+/* MAC ADDRESS: MAC_ADDR0:MAC_ADDR1:MAC_ADDR2:MAC_ADDR3:MAC_ADDR4:MAC_ADDR5 */
+#define MAC_ADDR0   2U
+#define MAC_ADDR1   0U
+#define MAC_ADDR2   0U
+#define MAC_ADDR3   0U
+#define MAC_ADDR4   0U
+#define MAC_ADDR5   0U
+
+/* Definition of the Ethernet driver buffers size and count */   
+#define ETH_RX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for receive               */
+#define ETH_TX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for transmit              */
+#define ETH_RXBUFNB                    ((uint32_t)4U)       /* 4 Rx buffers of size ETH_RX_BUF_SIZE  */
+#define ETH_TXBUFNB                    ((uint32_t)4U)       /* 4 Tx buffers of size ETH_TX_BUF_SIZE  */
+
+/* Section 2: PHY configuration section */
+
+/* DP83848_PHY_ADDRESS Address*/ 
+#define DP83848_PHY_ADDRESS           0x01U
+/* PHY Reset delay these values are based on a 1 ms Systick interrupt*/ 
+#define PHY_RESET_DELAY                 ((uint32_t)0x000000FFU)
+/* PHY Configuration delay */
+#define PHY_CONFIG_DELAY                ((uint32_t)0x00000FFFU)
+
+#define PHY_READ_TO                     ((uint32_t)0x0000FFFFU)
+#define PHY_WRITE_TO                    ((uint32_t)0x0000FFFFU)
+
+/* Section 3: Common PHY Registers */
+
+#define PHY_BCR                         ((uint16_t)0x0000U)    /*!< Transceiver Basic Control Register   */
+#define PHY_BSR                         ((uint16_t)0x0001U)    /*!< Transceiver Basic Status Register    */
+ 
+#define PHY_RESET                       ((uint16_t)0x8000U)  /*!< PHY Reset */
+#define PHY_LOOPBACK                    ((uint16_t)0x4000U)  /*!< Select loop-back mode */
+#define PHY_FULLDUPLEX_100M             ((uint16_t)0x2100U)  /*!< Set the full-duplex mode at 100 Mb/s */
+#define PHY_HALFDUPLEX_100M             ((uint16_t)0x2000U)  /*!< Set the half-duplex mode at 100 Mb/s */
+#define PHY_FULLDUPLEX_10M              ((uint16_t)0x0100U)  /*!< Set the full-duplex mode at 10 Mb/s  */
+#define PHY_HALFDUPLEX_10M              ((uint16_t)0x0000U)  /*!< Set the half-duplex mode at 10 Mb/s  */
+#define PHY_AUTONEGOTIATION             ((uint16_t)0x1000U)  /*!< Enable auto-negotiation function     */
+#define PHY_RESTART_AUTONEGOTIATION     ((uint16_t)0x0200U)  /*!< Restart auto-negotiation function    */
+#define PHY_POWERDOWN                   ((uint16_t)0x0800U)  /*!< Select the power down mode           */
+#define PHY_ISOLATE                     ((uint16_t)0x0400U)  /*!< Isolate PHY from MII                 */
+
+#define PHY_AUTONEGO_COMPLETE           ((uint16_t)0x0020U)  /*!< Auto-Negotiation process completed   */
+#define PHY_LINKED_STATUS               ((uint16_t)0x0004U)  /*!< Valid link established               */
+#define PHY_JABBER_DETECTION            ((uint16_t)0x0002U)  /*!< Jabber condition detected            */
+  
+/* Section 4: Extended PHY Registers */
+#define PHY_SR                          ((uint16_t)0x10U)    /*!< PHY status register Offset                      */
+
+#define PHY_SPEED_STATUS                ((uint16_t)0x0002U)  /*!< PHY Speed mask                                  */
+#define PHY_DUPLEX_STATUS               ((uint16_t)0x0004U)  /*!< PHY Duplex mask                                 */
+
+/* ################## SPI peripheral configuration ########################## */
+
+/* CRC FEATURE: Use to activate CRC feature inside HAL SPI Driver
+* Activated: CRC code is present inside driver
+* Deactivated: CRC code cleaned from driver
+*/
+
+#define USE_SPI_CRC                     0U
+
+/* Includes ------------------------------------------------------------------*/
+/**
+  * @brief Include module's header file 
+  */
+
+#ifdef HAL_RCC_MODULE_ENABLED
+  #include "stm32f4xx_hal_rcc.h"
+#endif /* HAL_RCC_MODULE_ENABLED */
+
+#ifdef HAL_EXTI_MODULE_ENABLED
+  #include "stm32f4xx_hal_exti.h"
+#endif /* HAL_EXTI_MODULE_ENABLED */
+
+#ifdef HAL_GPIO_MODULE_ENABLED
+  #include "stm32f4xx_hal_gpio.h"
+#endif /* HAL_GPIO_MODULE_ENABLED */
+
+#ifdef HAL_DMA_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma.h"
+#endif /* HAL_DMA_MODULE_ENABLED */
+   
+#ifdef HAL_CORTEX_MODULE_ENABLED
+  #include "stm32f4xx_hal_cortex.h"
+#endif /* HAL_CORTEX_MODULE_ENABLED */
+
+#ifdef HAL_ADC_MODULE_ENABLED
+  #include "stm32f4xx_hal_adc.h"
+#endif /* HAL_ADC_MODULE_ENABLED */
+
+#ifdef HAL_CAN_MODULE_ENABLED
+  #include "stm32f4xx_hal_can.h"
+#endif /* HAL_CAN_MODULE_ENABLED */
+
+#ifdef HAL_CRC_MODULE_ENABLED
+  #include "stm32f4xx_hal_crc.h"
+#endif /* HAL_CRC_MODULE_ENABLED */
+
+#ifdef HAL_CRYP_MODULE_ENABLED
+  #include "stm32f4xx_hal_cryp.h" 
+#endif /* HAL_CRYP_MODULE_ENABLED */
+
+#ifdef HAL_DMA2D_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma2d.h"
+#endif /* HAL_DMA2D_MODULE_ENABLED */
+
+#ifdef HAL_DAC_MODULE_ENABLED
+  #include "stm32f4xx_hal_dac.h"
+#endif /* HAL_DAC_MODULE_ENABLED */
+
+#ifdef HAL_DCMI_MODULE_ENABLED
+  #include "stm32f4xx_hal_dcmi.h"
+#endif /* HAL_DCMI_MODULE_ENABLED */
+
+#ifdef HAL_ETH_MODULE_ENABLED
+  #include "stm32f4xx_hal_eth.h"
+#endif /* HAL_ETH_MODULE_ENABLED */
+
+#ifdef HAL_FLASH_MODULE_ENABLED
+  #include "stm32f4xx_hal_flash.h"
+#endif /* HAL_FLASH_MODULE_ENABLED */
+ 
+#ifdef HAL_SRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sram.h"
+#endif /* HAL_SRAM_MODULE_ENABLED */
+
+#ifdef HAL_NOR_MODULE_ENABLED
+  #include "stm32f4xx_hal_nor.h"
+#endif /* HAL_NOR_MODULE_ENABLED */
+
+#ifdef HAL_NAND_MODULE_ENABLED
+  #include "stm32f4xx_hal_nand.h"
+#endif /* HAL_NAND_MODULE_ENABLED */
+
+#ifdef HAL_PCCARD_MODULE_ENABLED
+  #include "stm32f4xx_hal_pccard.h"
+#endif /* HAL_PCCARD_MODULE_ENABLED */ 
+  
+#ifdef HAL_SDRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sdram.h"
+#endif /* HAL_SDRAM_MODULE_ENABLED */      
+
+#ifdef HAL_HASH_MODULE_ENABLED
+ #include "stm32f4xx_hal_hash.h"
+#endif /* HAL_HASH_MODULE_ENABLED */
+
+#ifdef HAL_I2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2c.h"
+#endif /* HAL_I2C_MODULE_ENABLED */
+
+#ifdef HAL_I2S_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2s.h"
+#endif /* HAL_I2S_MODULE_ENABLED */
+
+#ifdef HAL_IWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_iwdg.h"
+#endif /* HAL_IWDG_MODULE_ENABLED */
+
+#ifdef HAL_LTDC_MODULE_ENABLED
+ #include "stm32f4xx_hal_ltdc.h"
+#endif /* HAL_LTDC_MODULE_ENABLED */
+
+#ifdef HAL_PWR_MODULE_ENABLED
+ #include "stm32f4xx_hal_pwr.h"
+#endif /* HAL_PWR_MODULE_ENABLED */
+
+#ifdef HAL_RNG_MODULE_ENABLED
+ #include "stm32f4xx_hal_rng.h"
+#endif /* HAL_RNG_MODULE_ENABLED */
+
+#ifdef HAL_RTC_MODULE_ENABLED
+ #include "stm32f4xx_hal_rtc.h"
+#endif /* HAL_RTC_MODULE_ENABLED */
+
+#ifdef HAL_SAI_MODULE_ENABLED
+ #include "stm32f4xx_hal_sai.h"
+#endif /* HAL_SAI_MODULE_ENABLED */
+
+#ifdef HAL_SD_MODULE_ENABLED
+ #include "stm32f4xx_hal_sd.h"
+#endif /* HAL_SD_MODULE_ENABLED */
+
+#ifdef HAL_MMC_MODULE_ENABLED
+ #include "stm32f4xx_hal_mmc.h"
+#endif /* HAL_MMC_MODULE_ENABLED */
+
+#ifdef HAL_SPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_spi.h"
+#endif /* HAL_SPI_MODULE_ENABLED */
+
+#ifdef HAL_TIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_tim.h"
+#endif /* HAL_TIM_MODULE_ENABLED */
+
+#ifdef HAL_UART_MODULE_ENABLED
+ #include "stm32f4xx_hal_uart.h"
+#endif /* HAL_UART_MODULE_ENABLED */
+
+#ifdef HAL_USART_MODULE_ENABLED
+ #include "stm32f4xx_hal_usart.h"
+#endif /* HAL_USART_MODULE_ENABLED */
+
+#ifdef HAL_IRDA_MODULE_ENABLED
+ #include "stm32f4xx_hal_irda.h"
+#endif /* HAL_IRDA_MODULE_ENABLED */
+
+#ifdef HAL_SMARTCARD_MODULE_ENABLED
+ #include "stm32f4xx_hal_smartcard.h"
+#endif /* HAL_SMARTCARD_MODULE_ENABLED */
+
+#ifdef HAL_WWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_wwdg.h"
+#endif /* HAL_WWDG_MODULE_ENABLED */
+
+#ifdef HAL_PCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_pcd.h"
+#endif /* HAL_PCD_MODULE_ENABLED */
+
+#ifdef HAL_HCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_hcd.h"
+#endif /* HAL_HCD_MODULE_ENABLED */
+   
+#ifdef HAL_DSI_MODULE_ENABLED
+ #include "stm32f4xx_hal_dsi.h"
+#endif /* HAL_DSI_MODULE_ENABLED */
+
+#ifdef HAL_QSPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_qspi.h"
+#endif /* HAL_QSPI_MODULE_ENABLED */
+
+#ifdef HAL_CEC_MODULE_ENABLED
+ #include "stm32f4xx_hal_cec.h"
+#endif /* HAL_CEC_MODULE_ENABLED */
+
+#ifdef HAL_FMPI2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_fmpi2c.h"
+#endif /* HAL_FMPI2C_MODULE_ENABLED */
+
+#ifdef HAL_SPDIFRX_MODULE_ENABLED
+ #include "stm32f4xx_hal_spdifrx.h"
+#endif /* HAL_SPDIFRX_MODULE_ENABLED */
+
+#ifdef HAL_DFSDM_MODULE_ENABLED
+ #include "stm32f4xx_hal_dfsdm.h"
+#endif /* HAL_DFSDM_MODULE_ENABLED */
+
+#ifdef HAL_LPTIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_lptim.h"
+#endif /* HAL_LPTIM_MODULE_ENABLED */
+   
+/* Exported macro ------------------------------------------------------------*/
+#ifdef  USE_FULL_ASSERT
+/**
+  * @brief  The assert_param macro is used for function's parameters check.
+  * @param  expr: If expr is false, it calls assert_failed function
+  *         which reports the name of the source file and the source
+  *         line number of the call that failed. 
+  *         If expr is true, it returns no value.
+  * @retval None
+  */
+  #define assert_param(expr) ((expr) ? (void)0U : assert_failed((uint8_t *)__FILE__, __LINE__))
+/* Exported functions ------------------------------------------------------- */
+  void assert_failed(uint8_t* file, uint32_t line);
+#else
+  #define assert_param(expr) ((void)0U)
+#endif /* USE_FULL_ASSERT */    
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __STM32F4xx_HAL_CONF_H */
+ 
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/ports/stm/boards/stm32f4_discovery/board.c b/ports/stm/boards/stm32f4_discovery/board.c
new file mode 100644
index 000000000..4421970ee
--- /dev/null
+++ b/ports/stm/boards/stm32f4_discovery/board.c
@@ -0,0 +1,38 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "boards/board.h"
+
+void board_init(void) {
+}
+
+bool board_requests_safe_mode(void) {
+  return false;
+}
+
+void reset_board(void) {
+
+}
diff --git a/ports/stm/boards/stm32f4_discovery/mpconfigboard.h b/ports/stm/boards/stm32f4_discovery/mpconfigboard.h
new file mode 100644
index 000000000..fcd7aa09c
--- /dev/null
+++ b/ports/stm/boards/stm32f4_discovery/mpconfigboard.h
@@ -0,0 +1,35 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+//Micropython setup
+
+#define MICROPY_HW_BOARD_NAME       "STM32F4_DISCO"
+#define MICROPY_HW_MCU_NAME         "STM32F407VG"
+
+#define FLASH_SIZE                  (0x100000)
+#define FLASH_PAGE_SIZE             (0x4000)
+
+#define BOARD_OSC_DIV (8)
diff --git a/ports/stm/boards/stm32f4_discovery/mpconfigboard.mk b/ports/stm/boards/stm32f4_discovery/mpconfigboard.mk
new file mode 100644
index 000000000..312a20f65
--- /dev/null
+++ b/ports/stm/boards/stm32f4_discovery/mpconfigboard.mk
@@ -0,0 +1,18 @@
+USB_VID = 0x239A
+USB_PID = 0x808A
+USB_PRODUCT = "STM32F407VG Discovery Board - CPy"
+USB_MANUFACTURER = "STMicroelectronics"
+USB_DEVICES = "CDC,MSC"
+
+INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL = NONE
+
+# This is technically a F407 but there's no difference
+# other than the camera and ethernet, which aren't supported. 
+MCU_SERIES = m4
+MCU_VARIANT = stm32f4
+MCU_SUB_VARIANT = stm32f407xx
+MCU_PACKAGE = 100
+CMSIS_MCU = STM32F407xx
+LD_FILE = boards/STM32F407_fs.ld
+
diff --git a/ports/stm/boards/stm32f4_discovery/pins.c b/ports/stm/boards/stm32f4_discovery/pins.c
new file mode 100644
index 000000000..712932145
--- /dev/null
+++ b/ports/stm/boards/stm32f4_discovery/pins.c
@@ -0,0 +1,107 @@
+#include "shared-bindings/board/__init__.h"
+
+STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
+  //P1
+  { MP_ROM_QSTR(MP_QSTR_PC00), MP_ROM_PTR(&pin_PC00) },
+  { MP_ROM_QSTR(MP_QSTR_PC01), MP_ROM_PTR(&pin_PC01) },
+  { MP_ROM_QSTR(MP_QSTR_PC02), MP_ROM_PTR(&pin_PC02) },
+  { MP_ROM_QSTR(MP_QSTR_PC03), MP_ROM_PTR(&pin_PC03) },
+  { MP_ROM_QSTR(MP_QSTR_PA00), MP_ROM_PTR(&pin_PA00) },
+  { MP_ROM_QSTR(MP_QSTR_PA01), MP_ROM_PTR(&pin_PA01) },
+  { MP_ROM_QSTR(MP_QSTR_PA02), MP_ROM_PTR(&pin_PA02) },
+  { MP_ROM_QSTR(MP_QSTR_PA03), MP_ROM_PTR(&pin_PA03) },
+  { MP_ROM_QSTR(MP_QSTR_PA04), MP_ROM_PTR(&pin_PA04) },
+  { MP_ROM_QSTR(MP_QSTR_PA05), MP_ROM_PTR(&pin_PA05) },
+  { MP_ROM_QSTR(MP_QSTR_PA06), MP_ROM_PTR(&pin_PA06) },
+  { MP_ROM_QSTR(MP_QSTR_PA07), MP_ROM_PTR(&pin_PA07) },
+  { MP_ROM_QSTR(MP_QSTR_PC04), MP_ROM_PTR(&pin_PC04) },
+  { MP_ROM_QSTR(MP_QSTR_PC05), MP_ROM_PTR(&pin_PC05) },
+  { MP_ROM_QSTR(MP_QSTR_PB00), MP_ROM_PTR(&pin_PB00) },
+  { MP_ROM_QSTR(MP_QSTR_PB01), MP_ROM_PTR(&pin_PB01) },
+  { MP_ROM_QSTR(MP_QSTR_PB02), MP_ROM_PTR(&pin_PB02) },
+  { MP_ROM_QSTR(MP_QSTR_PE07), MP_ROM_PTR(&pin_PE07) },
+  { MP_ROM_QSTR(MP_QSTR_PE08), MP_ROM_PTR(&pin_PE08) },
+  { MP_ROM_QSTR(MP_QSTR_PE09), MP_ROM_PTR(&pin_PE09) },
+  { MP_ROM_QSTR(MP_QSTR_PE10), MP_ROM_PTR(&pin_PE10) },
+  { MP_ROM_QSTR(MP_QSTR_PE11), MP_ROM_PTR(&pin_PE11) },
+  { MP_ROM_QSTR(MP_QSTR_PE12), MP_ROM_PTR(&pin_PE12) },
+  { MP_ROM_QSTR(MP_QSTR_PE13), MP_ROM_PTR(&pin_PE13) },
+  { MP_ROM_QSTR(MP_QSTR_PE14), MP_ROM_PTR(&pin_PE14) },
+  { MP_ROM_QSTR(MP_QSTR_PE15), MP_ROM_PTR(&pin_PE15) },
+  { MP_ROM_QSTR(MP_QSTR_PB11), MP_ROM_PTR(&pin_PB11) }, // Differs from F411
+  { MP_ROM_QSTR(MP_QSTR_PB10), MP_ROM_PTR(&pin_PB10) },
+  { MP_ROM_QSTR(MP_QSTR_PB12), MP_ROM_PTR(&pin_PB12) },
+  { MP_ROM_QSTR(MP_QSTR_PB13), MP_ROM_PTR(&pin_PB13) },
+  { MP_ROM_QSTR(MP_QSTR_PB14), MP_ROM_PTR(&pin_PB14) },
+  { MP_ROM_QSTR(MP_QSTR_PB15), MP_ROM_PTR(&pin_PB15) },
+  { MP_ROM_QSTR(MP_QSTR_PD08), MP_ROM_PTR(&pin_PD08) },
+  { MP_ROM_QSTR(MP_QSTR_PD09), MP_ROM_PTR(&pin_PD09) },
+  { MP_ROM_QSTR(MP_QSTR_PD10), MP_ROM_PTR(&pin_PD10) },
+  { MP_ROM_QSTR(MP_QSTR_PD11), MP_ROM_PTR(&pin_PD11) },
+  { MP_ROM_QSTR(MP_QSTR_PD12), MP_ROM_PTR(&pin_PD12) },
+  { MP_ROM_QSTR(MP_QSTR_PD13), MP_ROM_PTR(&pin_PD13) },
+  { MP_ROM_QSTR(MP_QSTR_PD14), MP_ROM_PTR(&pin_PD14) },
+  { MP_ROM_QSTR(MP_QSTR_PD15), MP_ROM_PTR(&pin_PD15) },
+  //P2
+  { MP_ROM_QSTR(MP_QSTR_PC14), MP_ROM_PTR(&pin_PC14) },
+  { MP_ROM_QSTR(MP_QSTR_PC15), MP_ROM_PTR(&pin_PC15) },
+  { MP_ROM_QSTR(MP_QSTR_PC13), MP_ROM_PTR(&pin_PC13) },
+  { MP_ROM_QSTR(MP_QSTR_PE06), MP_ROM_PTR(&pin_PE06) },
+  { MP_ROM_QSTR(MP_QSTR_PE05), MP_ROM_PTR(&pin_PE05) },
+  { MP_ROM_QSTR(MP_QSTR_PE04), MP_ROM_PTR(&pin_PE04) },
+  { MP_ROM_QSTR(MP_QSTR_PE03), MP_ROM_PTR(&pin_PE03) },
+  { MP_ROM_QSTR(MP_QSTR_PE02), MP_ROM_PTR(&pin_PE02) },
+  { MP_ROM_QSTR(MP_QSTR_PE01), MP_ROM_PTR(&pin_PE01) },
+  { MP_ROM_QSTR(MP_QSTR_PE00), MP_ROM_PTR(&pin_PE00) },
+  { MP_ROM_QSTR(MP_QSTR_PB09), MP_ROM_PTR(&pin_PB09) },
+  { MP_ROM_QSTR(MP_QSTR_PB08), MP_ROM_PTR(&pin_PB08) },
+  { MP_ROM_QSTR(MP_QSTR_PB07), MP_ROM_PTR(&pin_PB07) },
+  { MP_ROM_QSTR(MP_QSTR_PB06), MP_ROM_PTR(&pin_PB06) },
+  { MP_ROM_QSTR(MP_QSTR_PB05), MP_ROM_PTR(&pin_PB05) },
+  { MP_ROM_QSTR(MP_QSTR_PB04), MP_ROM_PTR(&pin_PB04) },
+  { MP_ROM_QSTR(MP_QSTR_PB03), MP_ROM_PTR(&pin_PB03) },
+  { MP_ROM_QSTR(MP_QSTR_PD07), MP_ROM_PTR(&pin_PD07) },
+  { MP_ROM_QSTR(MP_QSTR_PD06), MP_ROM_PTR(&pin_PD06) },
+  { MP_ROM_QSTR(MP_QSTR_PD05), MP_ROM_PTR(&pin_PD05) },
+  { MP_ROM_QSTR(MP_QSTR_PD04), MP_ROM_PTR(&pin_PD04) },
+  { MP_ROM_QSTR(MP_QSTR_PD03), MP_ROM_PTR(&pin_PD03) },
+  { MP_ROM_QSTR(MP_QSTR_PD02), MP_ROM_PTR(&pin_PD02) },
+  { MP_ROM_QSTR(MP_QSTR_PD01), MP_ROM_PTR(&pin_PD01) },
+  { MP_ROM_QSTR(MP_QSTR_PD00), MP_ROM_PTR(&pin_PD00) },
+  { MP_ROM_QSTR(MP_QSTR_PC12), MP_ROM_PTR(&pin_PC12) },
+  { MP_ROM_QSTR(MP_QSTR_PC11), MP_ROM_PTR(&pin_PC11) },
+  { MP_ROM_QSTR(MP_QSTR_PC10), MP_ROM_PTR(&pin_PC10) },
+  { MP_ROM_QSTR(MP_QSTR_PA15), MP_ROM_PTR(&pin_PA15) },
+  { MP_ROM_QSTR(MP_QSTR_PA14), MP_ROM_PTR(&pin_PA14) },
+  { MP_ROM_QSTR(MP_QSTR_PA13), MP_ROM_PTR(&pin_PA13) },
+  { MP_ROM_QSTR(MP_QSTR_PA10), MP_ROM_PTR(&pin_PA10) },
+  { MP_ROM_QSTR(MP_QSTR_PA09), MP_ROM_PTR(&pin_PA09) },
+  { MP_ROM_QSTR(MP_QSTR_PA08), MP_ROM_PTR(&pin_PA08) },
+  { MP_ROM_QSTR(MP_QSTR_PC09), MP_ROM_PTR(&pin_PC09) },
+  { MP_ROM_QSTR(MP_QSTR_PC08), MP_ROM_PTR(&pin_PC08) },
+  { MP_ROM_QSTR(MP_QSTR_PC07), MP_ROM_PTR(&pin_PC07) },
+  { MP_ROM_QSTR(MP_QSTR_PC06), MP_ROM_PTR(&pin_PC06) },
+  //ST LED names
+  { MP_ROM_QSTR(MP_QSTR_LD3), MP_ROM_PTR(&pin_PD13) },
+  { MP_ROM_QSTR(MP_QSTR_LD4), MP_ROM_PTR(&pin_PD12) },
+  { MP_ROM_QSTR(MP_QSTR_LD5), MP_ROM_PTR(&pin_PD14) },
+  { MP_ROM_QSTR(MP_QSTR_LD6), MP_ROM_PTR(&pin_PD15) },
+  //more useful LED names
+  { MP_ROM_QSTR(MP_QSTR_LED1), MP_ROM_PTR(&pin_PD13) },
+  { MP_ROM_QSTR(MP_QSTR_LED2), MP_ROM_PTR(&pin_PD12) },
+  { MP_ROM_QSTR(MP_QSTR_LED3), MP_ROM_PTR(&pin_PD14) },
+  { MP_ROM_QSTR(MP_QSTR_LED4), MP_ROM_PTR(&pin_PD15) },
+  //AnalogIO names
+  { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA00) },
+  { MP_ROM_QSTR(MP_QSTR_A1), MP_ROM_PTR(&pin_PA01) },
+  { MP_ROM_QSTR(MP_QSTR_A2), MP_ROM_PTR(&pin_PA02) },
+  { MP_ROM_QSTR(MP_QSTR_A3), MP_ROM_PTR(&pin_PA03) },
+  { MP_ROM_QSTR(MP_QSTR_A4), MP_ROM_PTR(&pin_PA04) },
+  { MP_ROM_QSTR(MP_QSTR_A5), MP_ROM_PTR(&pin_PA05) },
+  //actual LED names
+  { MP_ROM_QSTR(MP_QSTR_LED_ORANGE), MP_ROM_PTR(&pin_PD13) },
+  { MP_ROM_QSTR(MP_QSTR_LED_GREEN), MP_ROM_PTR(&pin_PD12) },
+  { MP_ROM_QSTR(MP_QSTR_LED_RED), MP_ROM_PTR(&pin_PD14) },
+  { MP_ROM_QSTR(MP_QSTR_LED_BLUE), MP_ROM_PTR(&pin_PD15) },
+};
+MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/stm/boards/stm32f4_discovery/stm32f4xx_hal_conf.h b/ports/stm/boards/stm32f4_discovery/stm32f4xx_hal_conf.h
new file mode 100644
index 000000000..ee5832d49
--- /dev/null
+++ b/ports/stm/boards/stm32f4_discovery/stm32f4xx_hal_conf.h
@@ -0,0 +1,439 @@
+/**
+  ******************************************************************************
+  * @file    stm32f4xx_hal_conf_template.h
+  * @author  MCD Application Team
+  * @brief   HAL configuration template file. 
+  *          This file should be copied to the application folder and renamed
+  *          to stm32f4xx_hal_conf.h.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */ 
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __STM32F4xx_HAL_CONF_H
+#define __STM32F4xx_HAL_CONF_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+
+/* ########################## Module Selection ############################## */
+/**
+  * @brief This is the list of modules to be used in the HAL driver 
+  */
+#define HAL_MODULE_ENABLED  
+
+#define HAL_ADC_MODULE_ENABLED
+/* #define HAL_CRYP_MODULE_ENABLED   */
+/* #define HAL_CAN_MODULE_ENABLED   */
+/* #define HAL_CRC_MODULE_ENABLED   */
+/* #define HAL_CRYP_MODULE_ENABLED   */
+#define HAL_DAC_MODULE_ENABLED
+/* #define HAL_DCMI_MODULE_ENABLED   */
+/* #define HAL_DMA2D_MODULE_ENABLED   */
+/* #define HAL_ETH_MODULE_ENABLED   */
+/* #define HAL_NAND_MODULE_ENABLED   */
+/* #define HAL_NOR_MODULE_ENABLED   */
+/* #define HAL_PCCARD_MODULE_ENABLED   */
+/* #define HAL_SRAM_MODULE_ENABLED   */
+/* #define HAL_SDRAM_MODULE_ENABLED   */
+/* #define HAL_HASH_MODULE_ENABLED   */
+#define HAL_I2C_MODULE_ENABLED
+#define HAL_I2S_MODULE_ENABLED
+/* #define HAL_IWDG_MODULE_ENABLED   */
+/* #define HAL_LTDC_MODULE_ENABLED   */
+#define HAL_RNG_MODULE_ENABLED
+/* #define HAL_RTC_MODULE_ENABLED   */
+/* #define HAL_SAI_MODULE_ENABLED   */
+/* #define HAL_SD_MODULE_ENABLED   */
+/* #define HAL_MMC_MODULE_ENABLED   */
+#define HAL_SPI_MODULE_ENABLED
+#define HAL_TIM_MODULE_ENABLED
+#define HAL_UART_MODULE_ENABLED   
+#define HAL_USART_MODULE_ENABLED
+/* #define HAL_IRDA_MODULE_ENABLED   */
+/* #define HAL_SMARTCARD_MODULE_ENABLED   */
+/* #define HAL_WWDG_MODULE_ENABLED   */
+#define HAL_PCD_MODULE_ENABLED
+/* #define HAL_HCD_MODULE_ENABLED   */
+/* #define HAL_DSI_MODULE_ENABLED   */
+/* #define HAL_QSPI_MODULE_ENABLED   */
+/* #define HAL_QSPI_MODULE_ENABLED   */
+/* #define HAL_CEC_MODULE_ENABLED   */
+/* #define HAL_FMPI2C_MODULE_ENABLED   */
+/* #define HAL_SPDIFRX_MODULE_ENABLED   */
+/* #define HAL_DFSDM_MODULE_ENABLED   */
+/* #define HAL_LPTIM_MODULE_ENABLED   */
+/* #define HAL_EXTI_MODULE_ENABLED   */
+#define HAL_GPIO_MODULE_ENABLED
+#define HAL_EXTI_MODULE_ENABLED
+#define HAL_DMA_MODULE_ENABLED
+#define HAL_RCC_MODULE_ENABLED
+#define HAL_FLASH_MODULE_ENABLED
+#define HAL_PWR_MODULE_ENABLED
+#define HAL_CORTEX_MODULE_ENABLED
+
+/* ########################## HSE/HSI Values adaptation ##################### */
+/**
+  * @brief Adjust the value of External High Speed oscillator (HSE) used in your application.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSE is used as system clock source, directly or through the PLL).  
+  */
+#if !defined  (HSE_VALUE) 
+  #define HSE_VALUE    ((uint32_t)8000000U) /*!< Value of the External oscillator in Hz */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSE_STARTUP_TIMEOUT)
+  #define HSE_STARTUP_TIMEOUT    ((uint32_t)100U)   /*!< Time out for HSE start up, in ms */
+#endif /* HSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief Internal High Speed oscillator (HSI) value.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSI is used as system clock source, directly or through the PLL). 
+  */
+#if !defined  (HSI_VALUE)
+  #define HSI_VALUE    ((uint32_t)16000000U) /*!< Value of the Internal oscillator in Hz*/
+#endif /* HSI_VALUE */
+
+/**
+  * @brief Internal Low Speed oscillator (LSI) value.
+  */
+#if !defined  (LSI_VALUE) 
+ #define LSI_VALUE  ((uint32_t)32000U)       /*!< LSI Typical Value in Hz*/
+#endif /* LSI_VALUE */                      /*!< Value of the Internal Low Speed oscillator in Hz
+                                             The real value may vary depending on the variations
+                                             in voltage and temperature.*/
+/**
+  * @brief External Low Speed oscillator (LSE) value.
+  */
+#if !defined  (LSE_VALUE)
+ #define LSE_VALUE  ((uint32_t)32768U)    /*!< Value of the External Low Speed oscillator in Hz */
+#endif /* LSE_VALUE */
+
+#if !defined  (LSE_STARTUP_TIMEOUT)
+  #define LSE_STARTUP_TIMEOUT    ((uint32_t)5000U)   /*!< Time out for LSE start up, in ms */
+#endif /* LSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief External clock source for I2S peripheral
+  *        This value is used by the I2S HAL module to compute the I2S clock source 
+  *        frequency, this source is inserted directly through I2S_CKIN pad. 
+  */
+#if !defined  (EXTERNAL_CLOCK_VALUE)
+  #define EXTERNAL_CLOCK_VALUE    ((uint32_t)12288000U) /*!< Value of the External audio frequency in Hz*/
+#endif /* EXTERNAL_CLOCK_VALUE */
+
+/* Tip: To avoid modifying this file each time you need to use different HSE,
+   ===  you can define the HSE value in your toolchain compiler preprocessor. */
+
+/* ########################### System Configuration ######################### */
+/**
+  * @brief This is the HAL system configuration section
+  */
+#define  VDD_VALUE		      ((uint32_t)3300U) /*!< Value of VDD in mv */           
+#define  TICK_INT_PRIORITY            ((uint32_t)0U)   /*!< tick interrupt priority */            
+#define  USE_RTOS                     0U     
+#define  PREFETCH_ENABLE              1U
+#define  INSTRUCTION_CACHE_ENABLE     1U
+#define  DATA_CACHE_ENABLE            1U
+
+/* ########################## Assert Selection ############################## */
+/**
+  * @brief Uncomment the line below to expanse the "assert_param" macro in the 
+  *        HAL drivers code
+  */
+/* #define USE_FULL_ASSERT    1U */
+
+/* ################## Ethernet peripheral configuration ##################### */
+
+/* Section 1 : Ethernet peripheral configuration */
+
+/* MAC ADDRESS: MAC_ADDR0:MAC_ADDR1:MAC_ADDR2:MAC_ADDR3:MAC_ADDR4:MAC_ADDR5 */
+#define MAC_ADDR0   2U
+#define MAC_ADDR1   0U
+#define MAC_ADDR2   0U
+#define MAC_ADDR3   0U
+#define MAC_ADDR4   0U
+#define MAC_ADDR5   0U
+
+/* Definition of the Ethernet driver buffers size and count */   
+#define ETH_RX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for receive               */
+#define ETH_TX_BUF_SIZE                ETH_MAX_PACKET_SIZE /* buffer size for transmit              */
+#define ETH_RXBUFNB                    ((uint32_t)4U)       /* 4 Rx buffers of size ETH_RX_BUF_SIZE  */
+#define ETH_TXBUFNB                    ((uint32_t)4U)       /* 4 Tx buffers of size ETH_TX_BUF_SIZE  */
+
+/* Section 2: PHY configuration section */
+
+/* DP83848_PHY_ADDRESS Address*/ 
+#define DP83848_PHY_ADDRESS           0x01U
+/* PHY Reset delay these values are based on a 1 ms Systick interrupt*/ 
+#define PHY_RESET_DELAY                 ((uint32_t)0x000000FFU)
+/* PHY Configuration delay */
+#define PHY_CONFIG_DELAY                ((uint32_t)0x00000FFFU)
+
+#define PHY_READ_TO                     ((uint32_t)0x0000FFFFU)
+#define PHY_WRITE_TO                    ((uint32_t)0x0000FFFFU)
+
+/* Section 3: Common PHY Registers */
+
+#define PHY_BCR                         ((uint16_t)0x0000U)    /*!< Transceiver Basic Control Register   */
+#define PHY_BSR                         ((uint16_t)0x0001U)    /*!< Transceiver Basic Status Register    */
+ 
+#define PHY_RESET                       ((uint16_t)0x8000U)  /*!< PHY Reset */
+#define PHY_LOOPBACK                    ((uint16_t)0x4000U)  /*!< Select loop-back mode */
+#define PHY_FULLDUPLEX_100M             ((uint16_t)0x2100U)  /*!< Set the full-duplex mode at 100 Mb/s */
+#define PHY_HALFDUPLEX_100M             ((uint16_t)0x2000U)  /*!< Set the half-duplex mode at 100 Mb/s */
+#define PHY_FULLDUPLEX_10M              ((uint16_t)0x0100U)  /*!< Set the full-duplex mode at 10 Mb/s  */
+#define PHY_HALFDUPLEX_10M              ((uint16_t)0x0000U)  /*!< Set the half-duplex mode at 10 Mb/s  */
+#define PHY_AUTONEGOTIATION             ((uint16_t)0x1000U)  /*!< Enable auto-negotiation function     */
+#define PHY_RESTART_AUTONEGOTIATION     ((uint16_t)0x0200U)  /*!< Restart auto-negotiation function    */
+#define PHY_POWERDOWN                   ((uint16_t)0x0800U)  /*!< Select the power down mode           */
+#define PHY_ISOLATE                     ((uint16_t)0x0400U)  /*!< Isolate PHY from MII                 */
+
+#define PHY_AUTONEGO_COMPLETE           ((uint16_t)0x0020U)  /*!< Auto-Negotiation process completed   */
+#define PHY_LINKED_STATUS               ((uint16_t)0x0004U)  /*!< Valid link established               */
+#define PHY_JABBER_DETECTION            ((uint16_t)0x0002U)  /*!< Jabber condition detected            */
+  
+/* Section 4: Extended PHY Registers */
+#define PHY_SR                          ((uint16_t)0x10U)    /*!< PHY status register Offset                      */
+
+#define PHY_SPEED_STATUS                ((uint16_t)0x0002U)  /*!< PHY Speed mask                                  */
+#define PHY_DUPLEX_STATUS               ((uint16_t)0x0004U)  /*!< PHY Duplex mask                                 */
+
+/* ################## SPI peripheral configuration ########################## */
+
+/* CRC FEATURE: Use to activate CRC feature inside HAL SPI Driver
+* Activated: CRC code is present inside driver
+* Deactivated: CRC code cleaned from driver
+*/
+
+#define USE_SPI_CRC                     0U
+
+/* Includes ------------------------------------------------------------------*/
+/**
+  * @brief Include module's header file 
+  */
+
+#ifdef HAL_RCC_MODULE_ENABLED
+  #include "stm32f4xx_hal_rcc.h"
+#endif /* HAL_RCC_MODULE_ENABLED */
+
+#ifdef HAL_EXTI_MODULE_ENABLED
+  #include "stm32f4xx_hal_exti.h"
+#endif /* HAL_EXTI_MODULE_ENABLED */
+
+#ifdef HAL_GPIO_MODULE_ENABLED
+  #include "stm32f4xx_hal_gpio.h"
+#endif /* HAL_GPIO_MODULE_ENABLED */
+
+#ifdef HAL_DMA_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma.h"
+#endif /* HAL_DMA_MODULE_ENABLED */
+   
+#ifdef HAL_CORTEX_MODULE_ENABLED
+  #include "stm32f4xx_hal_cortex.h"
+#endif /* HAL_CORTEX_MODULE_ENABLED */
+
+#ifdef HAL_ADC_MODULE_ENABLED
+  #include "stm32f4xx_hal_adc.h"
+#endif /* HAL_ADC_MODULE_ENABLED */
+
+#ifdef HAL_CAN_MODULE_ENABLED
+  #include "stm32f4xx_hal_can.h"
+#endif /* HAL_CAN_MODULE_ENABLED */
+
+#ifdef HAL_CRC_MODULE_ENABLED
+  #include "stm32f4xx_hal_crc.h"
+#endif /* HAL_CRC_MODULE_ENABLED */
+
+#ifdef HAL_CRYP_MODULE_ENABLED
+  #include "stm32f4xx_hal_cryp.h" 
+#endif /* HAL_CRYP_MODULE_ENABLED */
+
+#ifdef HAL_DMA2D_MODULE_ENABLED
+  #include "stm32f4xx_hal_dma2d.h"
+#endif /* HAL_DMA2D_MODULE_ENABLED */
+
+#ifdef HAL_DAC_MODULE_ENABLED
+  #include "stm32f4xx_hal_dac.h"
+#endif /* HAL_DAC_MODULE_ENABLED */
+
+#ifdef HAL_DCMI_MODULE_ENABLED
+  #include "stm32f4xx_hal_dcmi.h"
+#endif /* HAL_DCMI_MODULE_ENABLED */
+
+#ifdef HAL_ETH_MODULE_ENABLED
+  #include "stm32f4xx_hal_eth.h"
+#endif /* HAL_ETH_MODULE_ENABLED */
+
+#ifdef HAL_FLASH_MODULE_ENABLED
+  #include "stm32f4xx_hal_flash.h"
+#endif /* HAL_FLASH_MODULE_ENABLED */
+ 
+#ifdef HAL_SRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sram.h"
+#endif /* HAL_SRAM_MODULE_ENABLED */
+
+#ifdef HAL_NOR_MODULE_ENABLED
+  #include "stm32f4xx_hal_nor.h"
+#endif /* HAL_NOR_MODULE_ENABLED */
+
+#ifdef HAL_NAND_MODULE_ENABLED
+  #include "stm32f4xx_hal_nand.h"
+#endif /* HAL_NAND_MODULE_ENABLED */
+
+#ifdef HAL_PCCARD_MODULE_ENABLED
+  #include "stm32f4xx_hal_pccard.h"
+#endif /* HAL_PCCARD_MODULE_ENABLED */ 
+  
+#ifdef HAL_SDRAM_MODULE_ENABLED
+  #include "stm32f4xx_hal_sdram.h"
+#endif /* HAL_SDRAM_MODULE_ENABLED */      
+
+#ifdef HAL_HASH_MODULE_ENABLED
+ #include "stm32f4xx_hal_hash.h"
+#endif /* HAL_HASH_MODULE_ENABLED */
+
+#ifdef HAL_I2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2c.h"
+#endif /* HAL_I2C_MODULE_ENABLED */
+
+#ifdef HAL_I2S_MODULE_ENABLED
+ #include "stm32f4xx_hal_i2s.h"
+#endif /* HAL_I2S_MODULE_ENABLED */
+
+#ifdef HAL_IWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_iwdg.h"
+#endif /* HAL_IWDG_MODULE_ENABLED */
+
+#ifdef HAL_LTDC_MODULE_ENABLED
+ #include "stm32f4xx_hal_ltdc.h"
+#endif /* HAL_LTDC_MODULE_ENABLED */
+
+#ifdef HAL_PWR_MODULE_ENABLED
+ #include "stm32f4xx_hal_pwr.h"
+#endif /* HAL_PWR_MODULE_ENABLED */
+
+#ifdef HAL_RNG_MODULE_ENABLED
+ #include "stm32f4xx_hal_rng.h"
+#endif /* HAL_RNG_MODULE_ENABLED */
+
+#ifdef HAL_RTC_MODULE_ENABLED
+ #include "stm32f4xx_hal_rtc.h"
+#endif /* HAL_RTC_MODULE_ENABLED */
+
+#ifdef HAL_SAI_MODULE_ENABLED
+ #include "stm32f4xx_hal_sai.h"
+#endif /* HAL_SAI_MODULE_ENABLED */
+
+#ifdef HAL_SD_MODULE_ENABLED
+ #include "stm32f4xx_hal_sd.h"
+#endif /* HAL_SD_MODULE_ENABLED */
+
+#ifdef HAL_MMC_MODULE_ENABLED
+ #include "stm32f4xx_hal_mmc.h"
+#endif /* HAL_MMC_MODULE_ENABLED */
+
+#ifdef HAL_SPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_spi.h"
+#endif /* HAL_SPI_MODULE_ENABLED */
+
+#ifdef HAL_TIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_tim.h"
+#endif /* HAL_TIM_MODULE_ENABLED */
+
+#ifdef HAL_UART_MODULE_ENABLED
+ #include "stm32f4xx_hal_uart.h"
+#endif /* HAL_UART_MODULE_ENABLED */
+
+#ifdef HAL_USART_MODULE_ENABLED
+ #include "stm32f4xx_hal_usart.h"
+#endif /* HAL_USART_MODULE_ENABLED */
+
+#ifdef HAL_IRDA_MODULE_ENABLED
+ #include "stm32f4xx_hal_irda.h"
+#endif /* HAL_IRDA_MODULE_ENABLED */
+
+#ifdef HAL_SMARTCARD_MODULE_ENABLED
+ #include "stm32f4xx_hal_smartcard.h"
+#endif /* HAL_SMARTCARD_MODULE_ENABLED */
+
+#ifdef HAL_WWDG_MODULE_ENABLED
+ #include "stm32f4xx_hal_wwdg.h"
+#endif /* HAL_WWDG_MODULE_ENABLED */
+
+#ifdef HAL_PCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_pcd.h"
+#endif /* HAL_PCD_MODULE_ENABLED */
+
+#ifdef HAL_HCD_MODULE_ENABLED
+ #include "stm32f4xx_hal_hcd.h"
+#endif /* HAL_HCD_MODULE_ENABLED */
+   
+#ifdef HAL_DSI_MODULE_ENABLED
+ #include "stm32f4xx_hal_dsi.h"
+#endif /* HAL_DSI_MODULE_ENABLED */
+
+#ifdef HAL_QSPI_MODULE_ENABLED
+ #include "stm32f4xx_hal_qspi.h"
+#endif /* HAL_QSPI_MODULE_ENABLED */
+
+#ifdef HAL_CEC_MODULE_ENABLED
+ #include "stm32f4xx_hal_cec.h"
+#endif /* HAL_CEC_MODULE_ENABLED */
+
+#ifdef HAL_FMPI2C_MODULE_ENABLED
+ #include "stm32f4xx_hal_fmpi2c.h"
+#endif /* HAL_FMPI2C_MODULE_ENABLED */
+
+#ifdef HAL_SPDIFRX_MODULE_ENABLED
+ #include "stm32f4xx_hal_spdifrx.h"
+#endif /* HAL_SPDIFRX_MODULE_ENABLED */
+
+#ifdef HAL_DFSDM_MODULE_ENABLED
+ #include "stm32f4xx_hal_dfsdm.h"
+#endif /* HAL_DFSDM_MODULE_ENABLED */
+
+#ifdef HAL_LPTIM_MODULE_ENABLED
+ #include "stm32f4xx_hal_lptim.h"
+#endif /* HAL_LPTIM_MODULE_ENABLED */
+   
+/* Exported macro ------------------------------------------------------------*/
+#ifdef  USE_FULL_ASSERT
+/**
+  * @brief  The assert_param macro is used for function's parameters check.
+  * @param  expr: If expr is false, it calls assert_failed function
+  *         which reports the name of the source file and the source
+  *         line number of the call that failed. 
+  *         If expr is true, it returns no value.
+  * @retval None
+  */
+  #define assert_param(expr) ((expr) ? (void)0U : assert_failed((uint8_t *)__FILE__, __LINE__))
+/* Exported functions ------------------------------------------------------- */
+  void assert_failed(uint8_t* file, uint32_t line);
+#else
+  #define assert_param(expr) ((void)0U)
+#endif /* USE_FULL_ASSERT */    
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __STM32F4xx_HAL_CONF_H */
+ 
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/ports/stm/common-hal/analogio/AnalogIn.c b/ports/stm/common-hal/analogio/AnalogIn.c
new file mode 100644
index 000000000..1d1b308b6
--- /dev/null
+++ b/ports/stm/common-hal/analogio/AnalogIn.c
@@ -0,0 +1,129 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft for Adafruit Industries
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "common-hal/analogio/AnalogIn.h"
+#include "py/runtime.h"
+#include "supervisor/shared/translate.h"
+
+#include "common-hal/microcontroller/Pin.h"
+
+#include "stm32f4xx_hal.h"
+#include "stm32f4xx_ll_gpio.h"
+#include "stm32f4xx_ll_adc.h"
+#include "stm32f4xx_ll_bus.h"
+
+void common_hal_analogio_analogin_construct(analogio_analogin_obj_t* self,
+        const mcu_pin_obj_t *pin) {
+
+    // No ADC function on pin
+    if (pin->adc_unit == 0x00) {
+        mp_raise_ValueError(translate("Pin does not have ADC capabilities"));
+    }
+    // TODO: add ADC traits to structure?
+
+    // Note that ADC2 is always bundled pin-to-pin with ADC1 if it exists, and used only
+    // for dual conversion. For this basic application it is never used.
+    LL_GPIO_SetPinMode(pin_port(pin->port), (uint32_t)pin_mask(pin->number), LL_GPIO_MODE_ANALOG);
+    if (pin->adc_unit & 0x01) {
+        LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_ADC1);
+    } else if (pin->adc_unit == 0x04) {
+        #ifdef LL_APB2_GRP1_PERIPH_ADC3
+        LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_ADC3);
+        #endif
+    } else {
+        mp_raise_ValueError(translate("Invalid ADC Unit value"));
+    }
+    claim_pin(pin);
+    self->pin = pin;
+}
+
+bool common_hal_analogio_analogin_deinited(analogio_analogin_obj_t *self) {
+    return self->pin == NULL;
+}
+
+void common_hal_analogio_analogin_deinit(analogio_analogin_obj_t *self) {
+    if (common_hal_analogio_analogin_deinited(self)) {
+        return;
+    }
+    reset_pin_number(self->pin->port,self->pin->number);
+    self->pin = NULL;
+}
+
+uint16_t common_hal_analogio_analogin_get_value(analogio_analogin_obj_t *self) {
+    // Something else might have used the ADC in a different way,
+    // so we completely re-initialize it.
+    ADC_TypeDef * ADCx;
+
+    if(self->pin->adc_unit & 0x01) {
+        ADCx = ADC1;
+    } else if (self->pin->adc_unit == 0x04) {
+        #ifdef ADC3
+        ADCx = ADC3;
+        #endif
+    } else {
+        mp_raise_ValueError(translate("Invalid ADC Unit value"));
+    }
+
+    LL_GPIO_SetPinMode(pin_port(self->pin->port), (uint32_t)pin_mask(self->pin->number), LL_GPIO_MODE_ANALOG);
+    //LL_GPIO_PIN_0
+
+    //HAL Implementation
+    ADC_HandleTypeDef AdcHandle;
+    ADC_ChannelConfTypeDef sConfig;
+
+    AdcHandle.Instance = ADCx;
+    AdcHandle.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
+    AdcHandle.Init.Resolution = ADC_RESOLUTION_12B;
+    AdcHandle.Init.ScanConvMode = DISABLE;
+    AdcHandle.Init.ContinuousConvMode = DISABLE;
+    AdcHandle.Init.DiscontinuousConvMode = DISABLE;
+    AdcHandle.Init.NbrOfDiscConversion = 0;
+    AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
+    AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START;
+    AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
+    AdcHandle.Init.NbrOfConversion = 1;
+    AdcHandle.Init.DMAContinuousRequests = DISABLE;
+    AdcHandle.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
+    HAL_ADC_Init(&AdcHandle);
+
+    sConfig.Channel = (uint32_t)self->pin->adc_channel; //ADC_CHANNEL_0 <-normal iteration, not mask
+    sConfig.Rank = 1;
+    sConfig.SamplingTime = ADC_SAMPLETIME_15CYCLES; //Taken from micropython
+    HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
+
+    HAL_ADC_Start(&AdcHandle);
+    HAL_ADC_PollForConversion(&AdcHandle,1);
+    uint16_t value = (uint16_t)HAL_ADC_GetValue(&AdcHandle);
+    HAL_ADC_Stop(&AdcHandle);
+
+    // // Shift the value to be 16 bit.
+    return value << 4;
+}
+
+float common_hal_analogio_analogin_get_reference_voltage(analogio_analogin_obj_t *self) {
+    return 3.3f;
+}
diff --git a/ports/stm/common-hal/analogio/AnalogIn.h b/ports/stm/common-hal/analogio/AnalogIn.h
new file mode 100644
index 000000000..910092897
--- /dev/null
+++ b/ports/stm/common-hal/analogio/AnalogIn.h
@@ -0,0 +1,48 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_COMMON_HAL_ANALOGIO_ANALOGIN_H
+#define MICROPY_INCLUDED_STM32F4_COMMON_HAL_ANALOGIO_ANALOGIN_H
+
+#include "common-hal/microcontroller/Pin.h"
+
+#include "py/obj.h"
+
+typedef struct {
+    mp_obj_base_t base;
+    const mcu_pin_obj_t * pin;
+} analogio_analogin_obj_t;
+
+static inline uint8_t stm32_adc_units(uint8_t adc_packed) {
+    return adc_packed >> 5;
+}
+
+static inline uint8_t stm32_adc_channel(uint8_t adc_packed) {
+    return adc_packed & 0x1f;
+}
+
+#endif // MICROPY_INCLUDED_STM32F4_COMMON_HAL_ANALOGIO_ANALOGIN_H
diff --git a/ports/stm/common-hal/analogio/AnalogOut.c b/ports/stm/common-hal/analogio/AnalogOut.c
new file mode 100644
index 000000000..2ea969f50
--- /dev/null
+++ b/ports/stm/common-hal/analogio/AnalogOut.c
@@ -0,0 +1,124 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013, 2014 Damien P. George
+ * Copyright (c) 2019, Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdint.h>
+#include <string.h>
+
+#include "py/mperrno.h"
+#include "py/runtime.h"
+
+#include "shared-bindings/analogio/AnalogOut.h"
+#include "shared-bindings/microcontroller/Pin.h"
+#include "supervisor/shared/translate.h"
+
+#include "common-hal/microcontroller/Pin.h"
+
+#include "stm32f4xx_hal.h"
+
+//DAC is shared between both channels.
+#if HAS_DAC
+DAC_HandleTypeDef handle;
+#endif
+
+STATIC bool dac_on[2];
+
+void common_hal_analogio_analogout_construct(analogio_analogout_obj_t* self,
+        const mcu_pin_obj_t *pin) {
+    #if !(HAS_DAC)
+    mp_raise_ValueError(translate("No DAC on chip"));
+    #else
+    if (pin == &pin_PA04) {
+        self->channel = DAC_CHANNEL_1;
+        self->dac_index = 0;
+    } else if (pin == &pin_PA05) {
+        self->channel = DAC_CHANNEL_2;
+        self->dac_index = 1;
+    } else {
+        mp_raise_ValueError(translate("Invalid DAC pin supplied"));
+    }
+
+    //Only init if the shared DAC is empty or reset
+    if (handle.Instance == NULL || handle.State == HAL_DAC_STATE_RESET) {
+        __HAL_RCC_DAC_CLK_ENABLE();
+        handle.Instance = DAC;
+        if (HAL_DAC_Init(&handle) != HAL_OK)
+        {
+            mp_raise_ValueError(translate("DAC Device Init Error"));
+        }
+    }
+
+    //init channel specific pin
+    GPIO_InitTypeDef GPIO_InitStruct = {0};
+    GPIO_InitStruct.Pin = pin_mask(pin->number);
+    GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    HAL_GPIO_Init(pin_port(pin->port), &GPIO_InitStruct);
+
+    self->ch_handle.DAC_Trigger = DAC_TRIGGER_NONE;
+    self->ch_handle.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
+    if (HAL_DAC_ConfigChannel(&handle, &self->ch_handle, self->channel) != HAL_OK) {
+        mp_raise_ValueError(translate("DAC Channel Init Error"));
+    }
+
+    dac_on[self->dac_index] = true;
+    self->pin = pin;
+    claim_pin(pin);
+    #endif
+}
+
+bool common_hal_analogio_analogout_deinited(analogio_analogout_obj_t *self) {
+    return !dac_on[self->dac_index];
+}
+
+void common_hal_analogio_analogout_deinit(analogio_analogout_obj_t *self) {
+    #if HAS_DAC
+    reset_pin_number(self->pin->port,self->pin->number);
+    self->pin = NULL;
+    dac_on[self->dac_index] = false;
+
+    //turn off the DAC if both channels are off
+    if(dac_on[0] == false && dac_on[1] == false) {
+        __HAL_RCC_DAC_CLK_DISABLE();
+        HAL_DAC_DeInit(&handle);
+    }
+    #endif
+}
+
+void common_hal_analogio_analogout_set_value(analogio_analogout_obj_t *self,
+        uint16_t value) {
+    #if HAS_DAC
+    HAL_DAC_SetValue(&handle, self->channel, DAC_ALIGN_12B_R, value >> 4);
+    HAL_DAC_Start(&handle, self->channel);
+    #endif
+}
+
+void analogout_reset(void) {
+    #if HAS_DAC
+    __HAL_RCC_DAC_CLK_DISABLE();
+    HAL_DAC_DeInit(&handle);
+    #endif
+}
diff --git a/ports/stm/common-hal/analogio/AnalogOut.h b/ports/stm/common-hal/analogio/AnalogOut.h
new file mode 100644
index 000000000..61591d0e6
--- /dev/null
+++ b/ports/stm/common-hal/analogio/AnalogOut.h
@@ -0,0 +1,49 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_COMMON_HAL_ANALOGIO_ANALOGOUT_H
+#define MICROPY_INCLUDED_STM32F4_COMMON_HAL_ANALOGIO_ANALOGOUT_H
+
+#include "common-hal/microcontroller/Pin.h"
+
+#include "py/obj.h"
+#include "stm32f4xx_hal.h"
+#include "stm32f4/periph.h"
+
+typedef struct {
+    mp_obj_base_t base;
+#if HAS_DAC
+    DAC_ChannelConfTypeDef ch_handle;
+#endif
+    const mcu_pin_obj_t * pin;
+    uint8_t channel;
+    uint8_t dac_index:1;
+} analogio_analogout_obj_t;
+
+void analogout_reset(void);
+
+#endif // MICROPY_INCLUDED_STM32F4_COMMON_HAL_ANALOGIO_ANALOGOUT_H
diff --git a/ports/stm/common-hal/analogio/__init__.c b/ports/stm/common-hal/analogio/__init__.c
new file mode 100644
index 000000000..eea58c77d
--- /dev/null
+++ b/ports/stm/common-hal/analogio/__init__.c
@@ -0,0 +1 @@
+// No analogio module functions.
diff --git a/ports/stm/common-hal/board/__init__.c b/ports/stm/common-hal/board/__init__.c
new file mode 100644
index 000000000..880033ed6
--- /dev/null
+++ b/ports/stm/common-hal/board/__init__.c
@@ -0,0 +1,25 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Dan Halbert for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
diff --git a/ports/stm/common-hal/busio/I2C.c b/ports/stm/common-hal/busio/I2C.c
new file mode 100644
index 000000000..8e98b966d
--- /dev/null
+++ b/ports/stm/common-hal/busio/I2C.c
@@ -0,0 +1,250 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include <stdbool.h>
+
+#include "shared-bindings/busio/I2C.h"
+#include "py/mperrno.h"
+#include "py/runtime.h"
+#include "stm32f4xx_hal.h"
+
+#include "shared-bindings/microcontroller/__init__.h"
+#include "supervisor/shared/translate.h"
+#include "common-hal/microcontroller/Pin.h"
+
+//arrays use 0 based numbering: I2C1 is stored at index 0
+#define MAX_I2C 3
+STATIC bool reserved_i2c[MAX_I2C];
+STATIC bool never_reset_i2c[MAX_I2C];
+
+#define ALL_CLOCKS 0xFF
+STATIC void i2c_clock_enable(uint8_t mask);
+STATIC void i2c_clock_disable(uint8_t mask);
+
+void i2c_reset(void) {
+    uint16_t never_reset_mask = 0x00;
+    for(int i = 0; i < MAX_I2C; i++) {
+        if (!never_reset_i2c[i]) {
+            reserved_i2c[i] = false;
+        } else {
+            never_reset_mask |= 1 << i;
+        }
+    }
+    i2c_clock_disable(ALL_CLOCKS & ~(never_reset_mask));
+}
+
+void common_hal_busio_i2c_construct(busio_i2c_obj_t *self,
+        const mcu_pin_obj_t* scl, const mcu_pin_obj_t* sda, uint32_t frequency, uint32_t timeout) {
+
+    //match pins to I2C objects
+    I2C_TypeDef * I2Cx;
+    uint8_t sda_len = MP_ARRAY_SIZE(mcu_i2c_sda_list);
+    uint8_t scl_len = MP_ARRAY_SIZE(mcu_i2c_scl_list);
+    bool i2c_taken = false;
+
+    for (uint i = 0; i < sda_len; i++) {
+        if (mcu_i2c_sda_list[i].pin == sda) {
+            for (uint j = 0; j < scl_len; j++) {
+                if ((mcu_i2c_scl_list[j].pin == scl)
+                    && (mcu_i2c_scl_list[j].i2c_index == mcu_i2c_sda_list[i].i2c_index)) {
+                    //keep looking if the I2C is taken, could be another SCL that works
+                    if (reserved_i2c[mcu_i2c_scl_list[i].i2c_index - 1]) {
+                        i2c_taken = true;
+                        continue;
+                    }
+                    self->scl = &mcu_i2c_scl_list[j];
+                    self->sda = &mcu_i2c_sda_list[i];
+                    break;
+                }
+            }
+        }
+    }
+
+    //handle typedef selection, errors
+    if (self->sda != NULL && self->scl != NULL ) {
+        I2Cx = mcu_i2c_banks[self->sda->i2c_index - 1];
+    } else {
+        if (i2c_taken) {
+            mp_raise_ValueError(translate("Hardware busy, try alternative pins"));
+        } else {
+            mp_raise_ValueError(translate("Invalid I2C pin selection"));
+        }
+    }
+
+    //Start GPIO for each pin
+    GPIO_InitTypeDef GPIO_InitStruct = {0};
+    GPIO_InitStruct.Pin = pin_mask(sda->number);
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
+    GPIO_InitStruct.Pull = GPIO_PULLUP;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
+    GPIO_InitStruct.Alternate = self->sda->altfn_index;
+    HAL_GPIO_Init(pin_port(sda->port), &GPIO_InitStruct);
+
+    GPIO_InitStruct.Pin = pin_mask(scl->number);
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
+    GPIO_InitStruct.Pull = GPIO_PULLUP;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
+    GPIO_InitStruct.Alternate = self->scl->altfn_index;
+    HAL_GPIO_Init(pin_port(scl->port), &GPIO_InitStruct);
+
+    //Note: due to I2C soft reboot issue, do not relocate clock init.
+    i2c_clock_enable(1 << (self->sda->i2c_index - 1));
+    reserved_i2c[self->sda->i2c_index - 1] = true;
+
+    self->handle.Instance = I2Cx;
+    self->handle.Init.ClockSpeed = 100000;
+    self->handle.Init.DutyCycle = I2C_DUTYCYCLE_2;
+    self->handle.Init.OwnAddress1 = 0;
+    self->handle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
+    self->handle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
+    self->handle.Init.OwnAddress2 = 0;
+    self->handle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
+    self->handle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
+    self->handle.State = HAL_I2C_STATE_RESET;
+    if (HAL_I2C_Init(&(self->handle)) != HAL_OK) {
+        mp_raise_RuntimeError(translate("I2C Init Error"));
+    }
+    claim_pin(sda);
+    claim_pin(scl);
+}
+
+void common_hal_busio_i2c_never_reset(busio_i2c_obj_t *self) {
+    for (size_t i = 0; i < MP_ARRAY_SIZE(mcu_i2c_banks); i++) {
+        if (self->handle.Instance == mcu_i2c_banks[i]) {
+            never_reset_i2c[i] = true;
+
+            never_reset_pin_number(self->scl->pin->port, self->scl->pin->number);
+            never_reset_pin_number(self->sda->pin->port, self->sda->pin->number);
+            break;
+        }
+    }
+}
+
+bool common_hal_busio_i2c_deinited(busio_i2c_obj_t *self) {
+    return self->sda == NULL;
+}
+
+void common_hal_busio_i2c_deinit(busio_i2c_obj_t *self) {
+    if (common_hal_busio_i2c_deinited(self)) {
+        return;
+    }
+
+    i2c_clock_disable(1 << (self->sda->i2c_index - 1));
+    reserved_i2c[self->sda->i2c_index - 1] = false;
+    never_reset_i2c[self->sda->i2c_index - 1] = false;
+
+    reset_pin_number(self->sda->pin->port,self->sda->pin->number);
+    reset_pin_number(self->scl->pin->port,self->scl->pin->number);
+    self->sda = NULL;
+    self->scl = NULL;
+}
+
+bool common_hal_busio_i2c_probe(busio_i2c_obj_t *self, uint8_t addr) {
+    return HAL_I2C_IsDeviceReady(&(self->handle), (uint16_t)(addr << 1), 2, 2) == HAL_OK;
+}
+
+bool common_hal_busio_i2c_try_lock(busio_i2c_obj_t *self) {
+    bool grabbed_lock = false;
+
+    //Critical section code that may be required at some point.
+    // uint32_t store_primask = __get_PRIMASK();
+    // __disable_irq();
+    // __DMB();
+
+        if (!self->has_lock) {
+            grabbed_lock = true;
+            self->has_lock = true;
+        }
+
+    // __DMB();
+    // __set_PRIMASK(store_primask);
+
+    return grabbed_lock;
+}
+
+bool common_hal_busio_i2c_has_lock(busio_i2c_obj_t *self) {
+    return self->has_lock;
+}
+
+void common_hal_busio_i2c_unlock(busio_i2c_obj_t *self) {
+    self->has_lock = false;
+}
+
+uint8_t common_hal_busio_i2c_write(busio_i2c_obj_t *self, uint16_t addr,
+                                   const uint8_t *data, size_t len, bool transmit_stop_bit) {
+    HAL_StatusTypeDef result = HAL_I2C_Master_Transmit(&(self->handle), (uint16_t)(addr << 1),
+                                                        (uint8_t *)data, (uint16_t)len, 500);
+    return result == HAL_OK ? 0 : MP_EIO;
+}
+
+uint8_t common_hal_busio_i2c_read(busio_i2c_obj_t *self, uint16_t addr,
+        uint8_t *data, size_t len) {
+    return HAL_I2C_Master_Receive(&(self->handle), (uint16_t)(addr<<1), data, (uint16_t)len, 500)
+                                    == HAL_OK ? 0 : MP_EIO;
+}
+
+STATIC void i2c_clock_enable(uint8_t mask) {
+    //Note: hard reset required due to soft reboot issue.
+    #ifdef I2C1
+    if (mask & (1 << 0)) {
+        __HAL_RCC_I2C1_CLK_ENABLE();
+        __HAL_RCC_I2C1_FORCE_RESET();
+        __HAL_RCC_I2C1_RELEASE_RESET();
+    }
+    #endif
+    #ifdef I2C2
+    if (mask & (1 << 1)) {
+        __HAL_RCC_I2C2_CLK_ENABLE();
+        __HAL_RCC_I2C2_FORCE_RESET();
+        __HAL_RCC_I2C2_RELEASE_RESET();
+    }
+    #endif
+    #ifdef I2C3
+    if (mask & (1 << 2)) {
+        __HAL_RCC_I2C3_CLK_ENABLE();
+        __HAL_RCC_I2C3_FORCE_RESET();
+        __HAL_RCC_I2C3_RELEASE_RESET();
+    }
+    #endif
+}
+
+STATIC void i2c_clock_disable(uint8_t mask) {
+    #ifdef I2C1
+    if (mask & (1 << 0)) {
+        __HAL_RCC_I2C1_CLK_DISABLE();
+    }
+    #endif
+    #ifdef I2C2
+    if (mask & (1 << 1)) {
+        __HAL_RCC_I2C2_CLK_DISABLE();
+    }
+    #endif
+    #ifdef I2C3
+    if (mask & (1 << 2)) {
+        __HAL_RCC_I2C3_CLK_DISABLE();
+    }
+    #endif
+}
diff --git a/ports/stm/common-hal/busio/I2C.h b/ports/stm/common-hal/busio/I2C.h
new file mode 100644
index 000000000..b5c891a98
--- /dev/null
+++ b/ports/stm/common-hal/busio/I2C.h
@@ -0,0 +1,48 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_COMMON_HAL_BUSIO_I2C_H
+#define MICROPY_INCLUDED_STM32F4_COMMON_HAL_BUSIO_I2C_H
+
+#include "common-hal/microcontroller/Pin.h"
+
+#include "stm32f4xx_hal.h"
+#include "stm32f4/periph.h"
+
+#include "py/obj.h"
+
+typedef struct {
+    mp_obj_base_t base;
+    I2C_HandleTypeDef handle;
+    bool has_lock;
+    const mcu_i2c_scl_obj_t *scl;
+    const mcu_i2c_sda_obj_t *sda;
+} busio_i2c_obj_t;
+
+void i2c_reset(void);
+
+#endif // MICROPY_INCLUDED_STM32F4_COMMON_HAL_BUSIO_I2C_H
diff --git a/ports/stm/common-hal/busio/OneWire.h b/ports/stm/common-hal/busio/OneWire.h
new file mode 100644
index 000000000..6e8c82979
--- /dev/null
+++ b/ports/stm/common-hal/busio/OneWire.h
@@ -0,0 +1,33 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_COMMON_HAL_BUSIO_ONEWIRE_H
+#define MICROPY_INCLUDED_STM32F4_COMMON_HAL_BUSIO_ONEWIRE_H
+
+// Use bitbangio.
+#include "shared-module/busio/OneWire.h"
+
+#endif // MICROPY_INCLUDED_STM32F4_COMMON_HAL_BUSIO_ONEWIRE_H
diff --git a/ports/stm/common-hal/busio/SPI.c b/ports/stm/common-hal/busio/SPI.c
new file mode 100644
index 000000000..7e25e0a57
--- /dev/null
+++ b/ports/stm/common-hal/busio/SPI.c
@@ -0,0 +1,470 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include <stdbool.h>
+
+#include "shared-bindings/busio/SPI.h"
+#include "py/mperrno.h"
+#include "py/runtime.h"
+#include "stm32f4xx_hal.h"
+
+#include "shared-bindings/microcontroller/__init__.h"
+#include "boards/board.h"
+#include "supervisor/shared/translate.h"
+#include "common-hal/microcontroller/Pin.h"
+
+// Note that any bugs introduced in this file can cause crashes at startup
+// for chips using external SPI flash.
+
+//arrays use 0 based numbering: SPI1 is stored at index 0
+#define MAX_SPI 6
+STATIC bool reserved_spi[MAX_SPI];
+STATIC bool never_reset_spi[MAX_SPI];
+
+#define ALL_CLOCKS 0xFF
+STATIC void spi_clock_enable(uint8_t mask);
+STATIC void spi_clock_disable(uint8_t mask);
+
+STATIC uint32_t get_busclock(SPI_TypeDef * instance) {
+    //SPI2 and 3 are on PCLK1, if they exist.
+    #ifdef SPI2
+        if (instance == SPI2) return HAL_RCC_GetPCLK1Freq();
+    #endif
+    #ifdef SPI3
+        if (instance == SPI3) return HAL_RCC_GetPCLK1Freq();
+    #endif
+    return HAL_RCC_GetPCLK2Freq();
+}
+
+STATIC uint32_t stm32_baud_to_spi_div(uint32_t baudrate, uint16_t * prescaler, uint32_t busclock) {
+    static const uint32_t baud_map[8][2] = {
+        {2,SPI_BAUDRATEPRESCALER_2},
+        {4,SPI_BAUDRATEPRESCALER_4},
+        {8,SPI_BAUDRATEPRESCALER_8},
+        {16,SPI_BAUDRATEPRESCALER_16},
+        {32,SPI_BAUDRATEPRESCALER_32},
+        {64,SPI_BAUDRATEPRESCALER_64},
+        {128,SPI_BAUDRATEPRESCALER_128},
+        {256,SPI_BAUDRATEPRESCALER_256}
+    };
+    size_t i = 0;
+    uint16_t divisor;
+    do {
+        divisor = baud_map[i][0];
+        if (baudrate >= (busclock/divisor)) {
+            *prescaler = divisor;
+            return baud_map[i][1];
+        }
+        i++;
+    } while (divisor != 256);
+    //only gets here if requested baud is lower than minimum
+    *prescaler = 256;
+    return SPI_BAUDRATEPRESCALER_256;
+}
+
+void spi_reset(void) {
+    uint16_t never_reset_mask = 0x00;
+    for (int i = 0; i < MAX_SPI; i++) {
+        if (!never_reset_spi[i]) {
+            reserved_spi[i] = false;
+        } else {
+            never_reset_mask |= 1 << i;
+        }
+    }
+    spi_clock_disable(ALL_CLOCKS & ~(never_reset_mask));
+}
+
+void common_hal_busio_spi_construct(busio_spi_obj_t *self,
+         const mcu_pin_obj_t * sck, const mcu_pin_obj_t * mosi,
+         const mcu_pin_obj_t * miso) {
+
+    //match pins to SPI objects
+    SPI_TypeDef * SPIx;
+
+    uint8_t sck_len = MP_ARRAY_SIZE(mcu_spi_sck_list);
+    uint8_t mosi_len = MP_ARRAY_SIZE(mcu_spi_mosi_list);
+    uint8_t miso_len = MP_ARRAY_SIZE(mcu_spi_miso_list);
+    bool spi_taken = false;
+
+    //SCK is not optional. MOSI and MISO are
+    for (uint i = 0; i < sck_len; i++) {
+        if (mcu_spi_sck_list[i].pin == sck) {
+            //if both MOSI and MISO exist, loop search normally
+            if ((mosi != NULL) && (miso != NULL)) {
+                //MOSI
+                for (uint j = 0; j < mosi_len; j++) {
+                    if (mcu_spi_mosi_list[j].pin == mosi) {
+                        //MISO
+                        for (uint k = 0; k < miso_len; k++) {
+                            if ((mcu_spi_miso_list[k].pin == miso) //everything needs the same index
+                                && (mcu_spi_sck_list[i].spi_index == mcu_spi_mosi_list[j].spi_index)
+                                && (mcu_spi_sck_list[i].spi_index == mcu_spi_miso_list[k].spi_index)) {
+                                //keep looking if the SPI is taken, edge case
+                                if (reserved_spi[mcu_spi_sck_list[i].spi_index - 1]) {
+                                    spi_taken = true;
+                                    continue;
+                                }
+                                //store pins if not
+                                self->sck = &mcu_spi_sck_list[i];
+                                self->mosi = &mcu_spi_mosi_list[j];
+                                self->miso = &mcu_spi_miso_list[k];
+                                break;
+                            }
+                        }
+                    }
+                }
+            // if just MISO, reduce search
+            } else if (miso != NULL) {
+                for (uint j = 0; j < miso_len; j++) {
+                    if ((mcu_spi_miso_list[j].pin == miso) //only SCK and MISO need the same index
+                        && (mcu_spi_sck_list[i].spi_index == mcu_spi_miso_list[j].spi_index)) {
+                        //keep looking if the SPI is taken, edge case
+                        if (reserved_spi[mcu_spi_sck_list[i].spi_index - 1]) {
+                            spi_taken = true;
+                            continue;
+                        }
+                        //store pins if not
+                        self->sck = &mcu_spi_sck_list[i];
+                        self->mosi = NULL;
+                        self->miso = &mcu_spi_miso_list[j];
+                        break;
+                    }
+                }
+            // if just MOSI, reduce search
+            } else if (mosi != NULL) {
+                for (uint j = 0; j < mosi_len; j++) {
+                    if ((mcu_spi_mosi_list[j].pin == mosi) //only SCK and MOSI need the same index
+                        && (mcu_spi_sck_list[i].spi_index == mcu_spi_mosi_list[j].spi_index)) {
+                        //keep looking if the SPI is taken, edge case
+                        if (reserved_spi[mcu_spi_sck_list[i].spi_index - 1]) {
+                            spi_taken = true;
+                            continue;
+                        }
+                        //store pins if not
+                        self->sck = &mcu_spi_sck_list[i];
+                        self->mosi = &mcu_spi_mosi_list[j];
+                        self->miso = NULL;
+                        break;
+                    }
+                }
+            } else {
+                //throw an error immediately
+                mp_raise_ValueError(translate("Must provide MISO or MOSI pin"));
+            }
+        }
+    }
+
+    //handle typedef selection, errors
+    if ( (self->sck != NULL && self->mosi != NULL && self->miso != NULL) ||
+        (self->sck != NULL && self->mosi != NULL && miso == NULL) ||
+        (self->sck != NULL && self->miso != NULL && mosi == NULL)) {
+        SPIx = mcu_spi_banks[self->sck->spi_index - 1];
+    } else {
+        if (spi_taken) {
+            mp_raise_ValueError(translate("Hardware busy, try alternative pins"));
+        } else {
+            mp_raise_ValueError(translate("Invalid SPI pin selection"));
+        }
+    }
+
+    //Start GPIO for each pin
+    GPIO_InitTypeDef GPIO_InitStruct = {0};
+    GPIO_InitStruct.Pin = pin_mask(sck->number);
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+    GPIO_InitStruct.Alternate = self->sck->altfn_index;
+    HAL_GPIO_Init(pin_port(sck->port), &GPIO_InitStruct);
+
+    if (self->mosi != NULL) {
+        GPIO_InitStruct.Pin = pin_mask(mosi->number);
+        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+        GPIO_InitStruct.Pull = GPIO_NOPULL;
+        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+        GPIO_InitStruct.Alternate = self->mosi->altfn_index;
+        HAL_GPIO_Init(pin_port(mosi->port), &GPIO_InitStruct);
+    }
+
+    if (self->miso != NULL) {
+        GPIO_InitStruct.Pin = pin_mask(miso->number);
+        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+        GPIO_InitStruct.Pull = GPIO_NOPULL;
+        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+        GPIO_InitStruct.Alternate = self->miso->altfn_index;
+        HAL_GPIO_Init(pin_port(miso->port), &GPIO_InitStruct);
+    }
+
+    spi_clock_enable(1 << (self->sck->spi_index - 1));
+    reserved_spi[self->sck->spi_index - 1] = true;
+
+    self->handle.Instance = SPIx;
+    self->handle.Init.Mode = SPI_MODE_MASTER;
+    // Direction change only required for RX-only, see RefMan RM0090:884
+    self->handle.Init.Direction = (self->mosi == NULL) ? SPI_CR1_RXONLY : SPI_DIRECTION_2LINES;
+    self->handle.Init.DataSize = SPI_DATASIZE_8BIT;
+    self->handle.Init.CLKPolarity = SPI_POLARITY_LOW;
+    self->handle.Init.CLKPhase = SPI_PHASE_1EDGE;
+    self->handle.Init.NSS = SPI_NSS_SOFT;
+    self->handle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256;
+    self->handle.Init.FirstBit = SPI_FIRSTBIT_MSB;
+    self->handle.Init.TIMode = SPI_TIMODE_DISABLE;
+    self->handle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
+    self->handle.Init.CRCPolynomial = 10;
+    if (HAL_SPI_Init(&self->handle) != HAL_OK)
+    {
+        mp_raise_ValueError(translate("SPI Init Error"));
+    }
+    self->baudrate = (get_busclock(SPIx) / 16);
+    self->prescaler = 16;
+    self->polarity = 0;
+    self->phase = 0;
+    self->bits = 8;
+
+    claim_pin(sck);
+    if (self->mosi != NULL) {
+        claim_pin(mosi);
+    }
+    if (self->miso != NULL) {
+        claim_pin(miso);
+    }
+}
+
+void common_hal_busio_spi_never_reset(busio_spi_obj_t *self) {
+    for (size_t i = 0; i < MP_ARRAY_SIZE(mcu_spi_banks); i++) {
+        if (mcu_spi_banks[i] == self->handle.Instance) {
+            never_reset_spi[i] = true;
+            never_reset_pin_number(self->sck->pin->port, self->sck->pin->number);
+            if (self->mosi != NULL) {
+                never_reset_pin_number(self->mosi->pin->port, self->mosi->pin->number);
+            }
+            if (self->miso != NULL) {
+                never_reset_pin_number(self->miso->pin->port, self->miso->pin->number);
+            }
+            break;
+        }
+    }
+}
+
+bool common_hal_busio_spi_deinited(busio_spi_obj_t *self) {
+    return self->sck->pin == NULL;
+}
+
+void common_hal_busio_spi_deinit(busio_spi_obj_t *self) {
+    if (common_hal_busio_spi_deinited(self)) {
+        return;
+    }
+    spi_clock_disable(1<<(self->sck->spi_index - 1));
+    reserved_spi[self->sck->spi_index - 1] = false;
+    never_reset_spi[self->sck->spi_index - 1] = false;
+
+    reset_pin_number(self->sck->pin->port,self->sck->pin->number);
+    if (self->mosi != NULL) {
+        reset_pin_number(self->mosi->pin->port,self->mosi->pin->number);
+    }
+    if (self->miso != NULL) {
+        reset_pin_number(self->miso->pin->port,self->miso->pin->number);
+    }
+    self->sck = NULL;
+    self->mosi = NULL;
+    self->miso = NULL;
+}
+
+bool common_hal_busio_spi_configure(busio_spi_obj_t *self,
+        uint32_t baudrate, uint8_t polarity, uint8_t phase, uint8_t bits) {
+    //This resets the SPI, so check before updating it redundantly
+    if (baudrate == self->baudrate && polarity== self->polarity
+        && phase == self->phase && bits == self->bits) {
+        return true;
+    }
+
+    //Deinit SPI
+    HAL_SPI_DeInit(&self->handle);
+
+    self->handle.Init.DataSize = (bits == 16) ? SPI_DATASIZE_16BIT : SPI_DATASIZE_8BIT;
+    self->handle.Init.CLKPolarity = (polarity) ? SPI_POLARITY_HIGH : SPI_POLARITY_LOW;
+    self->handle.Init.CLKPhase = (phase) ? SPI_PHASE_2EDGE : SPI_PHASE_1EDGE;
+
+    self->handle.Init.BaudRatePrescaler = stm32_baud_to_spi_div(baudrate, &self->prescaler,
+                                            get_busclock(self->handle.Instance));
+
+    if (HAL_SPI_Init(&self->handle) != HAL_OK)
+    {
+        mp_raise_ValueError(translate("SPI Re-initialization error"));
+    }
+
+    self->baudrate = baudrate;
+    self->polarity = polarity;
+    self->phase = phase;
+    self->bits = bits;
+    return true;
+}
+
+bool common_hal_busio_spi_try_lock(busio_spi_obj_t *self) {
+    bool grabbed_lock = false;
+
+    //Critical section code that may be required at some point.
+    // uint32_t store_primask = __get_PRIMASK();
+    // __disable_irq();
+    // __DMB();
+
+    if (!self->has_lock) {
+        grabbed_lock = true;
+        self->has_lock = true;
+    }
+
+    // __DMB();
+    // __set_PRIMASK(store_primask);
+
+    return grabbed_lock;
+}
+
+bool common_hal_busio_spi_has_lock(busio_spi_obj_t *self) {
+    return self->has_lock;
+}
+
+void common_hal_busio_spi_unlock(busio_spi_obj_t *self) {
+    self->has_lock = false;
+}
+
+bool common_hal_busio_spi_write(busio_spi_obj_t *self,
+        const uint8_t *data, size_t len) {
+    if (self->mosi == NULL) {
+        mp_raise_ValueError(translate("No MOSI Pin"));
+    }
+    HAL_StatusTypeDef result = HAL_SPI_Transmit (&self->handle, (uint8_t *)data, (uint16_t)len, HAL_MAX_DELAY);
+    return result == HAL_OK;
+}
+
+bool common_hal_busio_spi_read(busio_spi_obj_t *self,
+        uint8_t *data, size_t len, uint8_t write_value) {
+    if (self->miso == NULL) {
+        mp_raise_ValueError(translate("No MISO Pin"));
+    }
+    HAL_StatusTypeDef result = HAL_SPI_Receive (&self->handle, data, (uint16_t)len, HAL_MAX_DELAY);
+    return result == HAL_OK;
+}
+
+bool common_hal_busio_spi_transfer(busio_spi_obj_t *self,
+        uint8_t *data_out, uint8_t *data_in, size_t len) {
+    if (self->miso == NULL || self->mosi == NULL) {
+        mp_raise_ValueError(translate("Missing MISO or MOSI Pin"));
+    }
+    HAL_StatusTypeDef result = HAL_SPI_TransmitReceive (&self->handle,
+        data_out, data_in, (uint16_t)len,HAL_MAX_DELAY);
+    return result == HAL_OK;
+}
+
+uint32_t common_hal_busio_spi_get_frequency(busio_spi_obj_t* self) {
+    //returns actual frequency
+    uint32_t result = HAL_RCC_GetPCLK2Freq()/self->prescaler;
+    return result;
+}
+
+uint8_t common_hal_busio_spi_get_phase(busio_spi_obj_t* self) {
+    return self->phase;
+}
+
+uint8_t common_hal_busio_spi_get_polarity(busio_spi_obj_t* self) {
+    return self->polarity;
+}
+
+STATIC void spi_clock_enable(uint8_t mask) {
+    #ifdef SPI1
+    if (mask & (1 << 0)) {
+        __HAL_RCC_SPI1_CLK_ENABLE();
+    }
+    #endif
+    #ifdef SPI2
+    if (mask & (1 << 1)) {
+        __HAL_RCC_SPI2_CLK_ENABLE();
+    }
+    #endif
+    #ifdef SPI3
+    if (mask & (1 << 2)) {
+        __HAL_RCC_SPI3_CLK_ENABLE();
+    }
+    #endif
+    #ifdef SPI4
+    if (mask & (1 << 3)) {
+        __HAL_RCC_SPI4_CLK_ENABLE();
+    }
+    #endif
+    #ifdef SPI5
+    if (mask & (1 << 4)) {
+        __HAL_RCC_SPI5_CLK_ENABLE();
+    }
+    #endif
+    #ifdef SPI6
+    if (mask & (1 << 5)) {
+        __HAL_RCC_SPI6_CLK_ENABLE();
+    }
+    #endif
+}
+
+STATIC void spi_clock_disable(uint8_t mask) {
+    #ifdef SPI1
+    if (mask & (1 << 0)) {
+        __HAL_RCC_SPI1_CLK_DISABLE();
+        __HAL_RCC_SPI1_FORCE_RESET();
+        __HAL_RCC_SPI1_RELEASE_RESET();
+    }
+    #endif
+    #ifdef SPI2
+    if (mask & (1 << 1)) {
+        __HAL_RCC_SPI2_CLK_DISABLE();
+        __HAL_RCC_SPI2_FORCE_RESET();
+        __HAL_RCC_SPI2_RELEASE_RESET();
+    }
+    #endif
+    #ifdef SPI3
+    if (mask & (1 << 2)) {
+        __HAL_RCC_SPI3_CLK_DISABLE();
+        __HAL_RCC_SPI3_FORCE_RESET();
+        __HAL_RCC_SPI3_RELEASE_RESET();
+    }
+    #endif
+    #ifdef SPI4
+    if (mask & (1 << 3)) {
+        __HAL_RCC_SPI4_CLK_DISABLE();
+        __HAL_RCC_SPI4_FORCE_RESET();
+        __HAL_RCC_SPI4_RELEASE_RESET();
+    }
+    #endif
+    #ifdef SPI5
+    if (mask & (1 << 4)) {
+        __HAL_RCC_SPI5_CLK_DISABLE();
+        __HAL_RCC_SPI5_FORCE_RESET();
+        __HAL_RCC_SPI5_RELEASE_RESET();
+    }
+    #endif
+    #ifdef SPI6
+    if (mask & (1 << 5)) {
+        __HAL_RCC_SPI6_CLK_DISABLE();
+        __HAL_RCC_SPI6_FORCE_RESET();
+        __HAL_RCC_SPI6_RELEASE_RESET();
+    }
+    #endif
+}
diff --git a/ports/stm/common-hal/busio/SPI.h b/ports/stm/common-hal/busio/SPI.h
new file mode 100644
index 000000000..067d2fcb6
--- /dev/null
+++ b/ports/stm/common-hal/busio/SPI.h
@@ -0,0 +1,55 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_COMMON_HAL_BUSIO_SPI_H
+#define MICROPY_INCLUDED_STM32F4_COMMON_HAL_BUSIO_SPI_H
+
+#include "common-hal/microcontroller/Pin.h"
+
+#include "stm32f4xx_hal.h"
+#include "stm32f4/periph.h"
+
+#include "py/obj.h"
+
+typedef struct {
+    mp_obj_base_t base;
+    SPI_HandleTypeDef handle;
+    bool has_lock;
+    const mcu_spi_sck_obj_t *sck;
+    const mcu_spi_mosi_obj_t *mosi;
+    const mcu_spi_miso_obj_t *miso;
+    const mcu_spi_nss_obj_t *nss;
+    uint32_t baudrate;
+    uint16_t prescaler;
+    uint8_t polarity;
+    uint8_t phase;
+    uint8_t bits;
+} busio_spi_obj_t;
+
+void spi_reset(void);
+
+#endif // MICROPY_INCLUDED_STM32F4_COMMON_HAL_BUSIO_SPI_H
diff --git a/ports/stm/common-hal/busio/UART.c b/ports/stm/common-hal/busio/UART.c
new file mode 100644
index 000000000..0b434fd02
--- /dev/null
+++ b/ports/stm/common-hal/busio/UART.c
@@ -0,0 +1,626 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "shared-bindings/microcontroller/__init__.h"
+#include "shared-bindings/busio/UART.h"
+
+#include "mpconfigport.h"
+#include "lib/utils/interrupt_char.h"
+#include "py/gc.h"
+#include "py/mperrno.h"
+#include "py/runtime.h"
+#include "py/stream.h"
+#include "supervisor/shared/translate.h"
+
+#include "tick.h"
+#include "stm32f4xx_hal.h"
+
+#define ALL_UARTS 0xFFFF
+
+//arrays use 0 based numbering: UART1 is stored at index 0
+STATIC bool reserved_uart[MAX_UART];
+int errflag; //Used to restart read halts
+
+STATIC void uart_clock_enable(uint16_t mask);
+STATIC void uart_clock_disable(uint16_t mask);
+STATIC void uart_assign_irq(busio_uart_obj_t* self, USART_TypeDef* USARTx);
+
+STATIC USART_TypeDef * assign_uart_or_throw(busio_uart_obj_t* self, bool pin_eval,
+                                            int uart_index, bool uart_taken) {
+    if (pin_eval) {
+        //assign a root pointer pointer for IRQ
+        MP_STATE_PORT(cpy_uart_obj_all)[uart_index] = self;
+        return mcu_uart_banks[uart_index];
+    } else {
+        if (uart_taken) {
+            mp_raise_ValueError(translate("Hardware in use, try alternative pins"));
+        } else {
+            mp_raise_ValueError(translate("Invalid UART pin selection"));
+        }
+    }
+}
+
+void uart_reset(void) {
+    for (uint8_t i = 0; i < MAX_UART; i++) {
+        reserved_uart[i] = false;
+        MP_STATE_PORT(cpy_uart_obj_all)[i] = NULL;
+    }
+    uart_clock_disable(ALL_UARTS);
+}
+
+void common_hal_busio_uart_construct(busio_uart_obj_t *self,
+    const mcu_pin_obj_t * tx, const mcu_pin_obj_t * rx,
+    const mcu_pin_obj_t * rts, const mcu_pin_obj_t * cts,
+    const mcu_pin_obj_t * rs485_dir, bool rs485_invert,
+    uint32_t baudrate, uint8_t bits, uart_parity_t parity, uint8_t stop,
+    mp_float_t timeout, uint16_t receiver_buffer_size) {
+
+    //match pins to UART objects
+    USART_TypeDef * USARTx;
+
+    uint8_t tx_len = MP_ARRAY_SIZE(mcu_uart_tx_list);
+    uint8_t rx_len = MP_ARRAY_SIZE(mcu_uart_rx_list);
+    bool uart_taken = false;
+    uint8_t uart_index = 0; //origin 0 corrected
+
+    if ((rts != NULL) || (cts != NULL) || (rs485_dir != NULL) || (rs485_invert == true)) {
+        mp_raise_ValueError(translate("RTS/CTS/RS485 Not yet supported on this device"));
+    }
+
+    //Can have both pins, or either
+    if ((tx != NULL) && (rx != NULL)) {
+        //normal find loop if both pins exist
+        for (uint i = 0; i < tx_len; i++) {
+            if (mcu_uart_tx_list[i].pin == tx) {
+                //rx
+                for (uint j = 0; j < rx_len; j++) {
+                    if (mcu_uart_rx_list[j].pin == rx
+                        && mcu_uart_rx_list[j].uart_index == mcu_uart_tx_list[i].uart_index) {
+                        //keep looking if the UART is taken, edge case
+                        if (reserved_uart[mcu_uart_tx_list[i].uart_index - 1]) {
+                            uart_taken = true;
+                            continue;
+                        }
+                        //store pins if not
+                        self->tx = &mcu_uart_tx_list[i];
+                        self->rx = &mcu_uart_rx_list[j];
+                        break;
+                    }
+                }
+            }
+        }
+        uart_index = self->tx->uart_index - 1;
+        USARTx = assign_uart_or_throw(self, (self->tx != NULL && self->rx != NULL),
+            uart_index, uart_taken);
+    } else if (tx == NULL) {
+        //If there is no tx, run only rx
+        for (uint i = 0; i < rx_len; i++) {
+            if (mcu_uart_rx_list[i].pin == rx) {
+                //keep looking if the UART is taken, edge case
+                if (reserved_uart[mcu_uart_rx_list[i].uart_index - 1]) {
+                    uart_taken = true;
+                    continue;
+                }
+                //store pins if not
+                self->rx = &mcu_uart_rx_list[i];
+                break;
+            }
+        }
+        uart_index = self->rx->uart_index - 1;
+        USARTx = assign_uart_or_throw(self, (self->rx != NULL),
+            uart_index, uart_taken);
+    } else if (rx == NULL) {
+        //If there is no rx, run only tx
+        for (uint i = 0; i < tx_len; i++) {
+            if (mcu_uart_tx_list[i].pin == tx) {
+                //keep looking if the UART is taken, edge case
+                if (reserved_uart[mcu_uart_tx_list[i].uart_index - 1]) {
+                    uart_taken = true;
+                    continue;
+                }
+                //store pins if not
+                self->tx = &mcu_uart_tx_list[i];
+                break;
+            }
+        }
+        uart_index = self->tx->uart_index - 1;
+        USARTx = assign_uart_or_throw(self, (self->tx != NULL),
+            uart_index, uart_taken);
+    } else {
+        //both pins cannot be empty
+        mp_raise_ValueError(translate("Supply at least one UART pin"));
+    }
+
+    //Other errors
+    if ( receiver_buffer_size == 0 ) {
+        mp_raise_ValueError(translate("Invalid buffer size"));
+    }
+    if ( bits != 8 && bits != 9 ) {
+        mp_raise_ValueError(translate("Invalid word/bit length"));
+    }
+    if ( USARTx == NULL) { //this can only be hit if the periph file is wrong
+        mp_raise_ValueError(translate("Internal define error"));
+    }
+
+    //GPIO Init
+    GPIO_InitTypeDef GPIO_InitStruct = {0};
+    if (self->tx != NULL) {
+        GPIO_InitStruct.Pin = pin_mask(tx->number);
+        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+        GPIO_InitStruct.Pull = GPIO_PULLUP;
+        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+        GPIO_InitStruct.Alternate = self->tx->altfn_index;
+        HAL_GPIO_Init(pin_port(tx->port), &GPIO_InitStruct);
+    }
+    if (self->rx != NULL) {
+        GPIO_InitStruct.Pin = pin_mask(rx->number);
+        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+        GPIO_InitStruct.Pull = GPIO_PULLUP;
+        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+        GPIO_InitStruct.Alternate = self->rx->altfn_index;
+        HAL_GPIO_Init(pin_port(rx->port), &GPIO_InitStruct);
+    }
+
+    //reserve uart and enable the peripheral
+    reserved_uart[uart_index] = true;
+    uart_clock_enable(1 << (uart_index));
+    uart_assign_irq(self, USARTx);
+
+    self->handle.Instance = USARTx;
+    self->handle.Init.BaudRate = baudrate;
+    self->handle.Init.WordLength = (bits == 9) ? UART_WORDLENGTH_9B : UART_WORDLENGTH_8B;
+    self->handle.Init.StopBits = (stop > 1) ? UART_STOPBITS_2 : UART_STOPBITS_1;
+    self->handle.Init.Parity = (parity == PARITY_ODD) ? UART_PARITY_ODD :
+                               (parity == PARITY_EVEN) ? UART_PARITY_EVEN :
+                               UART_PARITY_NONE;
+    self->handle.Init.Mode = (self->tx != NULL && self->rx != NULL) ? UART_MODE_TX_RX :
+                             (self->tx != NULL) ? UART_MODE_TX :
+                             UART_MODE_RX;
+    self->handle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
+    self->handle.Init.OverSampling = UART_OVERSAMPLING_16;
+    if (HAL_UART_Init(&self->handle) != HAL_OK)
+    {
+        mp_raise_ValueError(translate("UART Init Error"));
+
+    }
+
+    // Init buffer for rx and claim pins
+    if (self->rx != NULL) {
+        ringbuf_alloc(&self->rbuf, receiver_buffer_size, true);
+        if (!self->rbuf.buf) {
+            mp_raise_ValueError(translate("UART Buffer allocation error"));
+        }
+        claim_pin(rx);
+    }
+    if (self->tx != NULL) {
+        claim_pin(tx);
+    }
+    self->baudrate = baudrate;
+    self->timeout_ms = timeout * 1000;
+
+    //start the interrupt series
+    if ((HAL_UART_GetState(&self->handle) & HAL_UART_STATE_BUSY_RX) == HAL_UART_STATE_BUSY_RX) {
+        mp_raise_ValueError(translate("Could not start interrupt, RX busy"));
+    }
+
+    //start the receive interrupt chain
+    HAL_NVIC_DisableIRQ(self->irq); //prevent handle lock contention
+    HAL_UART_Receive_IT(&self->handle, &self->rx_char, 1);
+    HAL_NVIC_SetPriority(self->irq, UART_IRQPRI, UART_IRQSUB_PRI);
+    HAL_NVIC_EnableIRQ(self->irq);
+
+    errflag = HAL_OK;
+}
+
+bool common_hal_busio_uart_deinited(busio_uart_obj_t *self) {
+    return self->tx->pin == NULL;
+}
+
+void common_hal_busio_uart_deinit(busio_uart_obj_t *self) {
+    if (common_hal_busio_uart_deinited(self)) return;
+
+    reset_pin_number(self->tx->pin->port,self->tx->pin->number);
+    reset_pin_number(self->rx->pin->port,self->rx->pin->number);
+    self->tx = NULL;
+    self->rx = NULL;
+    gc_free(self->rbuf.buf);
+    self->rbuf.size = 0;
+    self->rbuf.iput = self->rbuf.iget = 0;
+}
+
+size_t common_hal_busio_uart_read(busio_uart_obj_t *self, uint8_t *data, size_t len, int *errcode) {
+    if (self->rx == NULL) {
+        mp_raise_ValueError(translate("No RX pin"));
+    }
+
+    size_t rx_bytes = 0;
+    uint64_t start_ticks = supervisor_ticks_ms64();
+
+    // Wait for all bytes received or timeout, same as nrf
+    while ( (ringbuf_count(&self->rbuf) < len) && (supervisor_ticks_ms64() - start_ticks < self->timeout_ms) ) {
+        RUN_BACKGROUND_TASKS;
+        //restart if it failed in the callback
+        if (errflag != HAL_OK) {
+            errflag = HAL_UART_Receive_IT(&self->handle, &self->rx_char, 1);
+        }
+        // Allow user to break out of a timeout with a KeyboardInterrupt.
+        if ( mp_hal_is_interrupted() ) {
+            return 0;
+        }
+    }
+
+    // Halt reception
+    HAL_NVIC_DisableIRQ(self->irq);
+    // copy received data
+    rx_bytes = ringbuf_count(&self->rbuf);
+    rx_bytes = MIN(rx_bytes, len);
+    for (uint16_t i = 0; i < rx_bytes; i++) {
+        data[i] = ringbuf_get(&self->rbuf);
+    }
+    HAL_NVIC_EnableIRQ(self->irq);
+
+    if (rx_bytes == 0) {
+        *errcode = EAGAIN;
+        return MP_STREAM_ERROR;
+    }
+    return rx_bytes;
+}
+
+// Write characters.
+size_t common_hal_busio_uart_write(busio_uart_obj_t *self, const uint8_t *data, size_t len, int *errcode) {
+    if (self->tx == NULL) {
+        mp_raise_ValueError(translate("No TX pin"));
+    }
+    bool write_err = false; //write error shouldn't disable interrupts
+
+    HAL_NVIC_DisableIRQ(self->irq);
+    if (HAL_UART_Transmit(&self->handle, (uint8_t*)data, len, HAL_MAX_DELAY) != HAL_OK) {
+        write_err = true;
+    }
+    HAL_UART_Receive_IT(&self->handle, &self->rx_char, 1);
+    HAL_NVIC_EnableIRQ(self->irq);
+
+    if (write_err) {
+        mp_raise_ValueError(translate("UART write error"));
+    }
+    return len;
+}
+
+void HAL_UART_RxCpltCallback(UART_HandleTypeDef *handle)
+{
+    for (int i = 0; i < 7; i++) {
+        //get context pointer and cast it as struct pointer
+        busio_uart_obj_t * context = (busio_uart_obj_t*)MP_STATE_PORT(cpy_uart_obj_all)[i];
+        if (handle == &context->handle) {
+            //check if transaction is ongoing
+            if ((HAL_UART_GetState(handle) & HAL_UART_STATE_BUSY_RX) == HAL_UART_STATE_BUSY_RX) {
+                return;
+            }
+            ringbuf_put_n(&context->rbuf, &context->rx_char, 1);
+            errflag = HAL_UART_Receive_IT(handle, &context->rx_char, 1);
+
+            return;
+        }
+    }
+}
+
+void HAL_UART_ErrorCallback(UART_HandleTypeDef *UartHandle)
+{
+    if (__HAL_UART_GET_FLAG(UartHandle, UART_FLAG_PE) != RESET) {
+        __HAL_UART_CLEAR_PEFLAG(UartHandle);
+    } else if (__HAL_UART_GET_FLAG(UartHandle, UART_FLAG_FE) != RESET) {
+        __HAL_UART_CLEAR_FEFLAG(UartHandle);
+    } else if (__HAL_UART_GET_FLAG(UartHandle, UART_FLAG_NE) != RESET) {
+        __HAL_UART_CLEAR_NEFLAG(UartHandle);
+    } else if (__HAL_UART_GET_FLAG(UartHandle, UART_FLAG_ORE) != RESET) {
+        __HAL_UART_CLEAR_OREFLAG(UartHandle);
+    }
+    //restart serial read after an error
+    for (int i = 0; i < 7; i++) {
+        busio_uart_obj_t * context = (busio_uart_obj_t *)MP_STATE_PORT(cpy_uart_obj_all)[i];
+        if (UartHandle == &context->handle) {
+            HAL_UART_Receive_IT(UartHandle, &context->rx_char, 1);
+            return;
+        }
+    }
+
+}
+
+uint32_t common_hal_busio_uart_get_baudrate(busio_uart_obj_t *self) {
+    return self->baudrate;
+}
+
+void common_hal_busio_uart_set_baudrate(busio_uart_obj_t *self, uint32_t baudrate) {
+    //Don't reset if it's the same value
+    if (baudrate == self->baudrate) return;
+
+    //Otherwise de-init and set new rate
+    if (HAL_UART_DeInit(&self->handle) != HAL_OK) {
+        mp_raise_ValueError(translate("UART De-init error"));
+    }
+    self->handle.Init.BaudRate = baudrate;
+    if (HAL_UART_Init(&self->handle) != HAL_OK) {
+        mp_raise_ValueError(translate("UART Re-init error"));
+    }
+
+    self->baudrate = baudrate;
+}
+
+mp_float_t common_hal_busio_uart_get_timeout(busio_uart_obj_t *self) {
+    return (mp_float_t) (self->timeout_ms / 1000.0f);
+}
+
+void common_hal_busio_uart_set_timeout(busio_uart_obj_t *self, mp_float_t timeout) {
+    self->timeout_ms = timeout * 1000;
+}
+
+uint32_t common_hal_busio_uart_rx_characters_available(busio_uart_obj_t *self) {
+    return ringbuf_count(&self->rbuf);
+}
+
+void common_hal_busio_uart_clear_rx_buffer(busio_uart_obj_t *self) {
+    // Halt reception
+    HAL_NVIC_DisableIRQ(self->irq);
+    ringbuf_clear(&self->rbuf);
+    HAL_NVIC_EnableIRQ(self->irq);
+}
+
+bool common_hal_busio_uart_ready_to_tx(busio_uart_obj_t *self) {
+    return __HAL_UART_GET_FLAG(&self->handle, UART_FLAG_TXE);
+}
+
+STATIC void call_hal_irq(int uart_num) {
+    //Create casted context pointer
+    busio_uart_obj_t * context = (busio_uart_obj_t*)MP_STATE_PORT(cpy_uart_obj_all)[uart_num - 1];
+    if (context != NULL) {
+        HAL_NVIC_ClearPendingIRQ(context->irq);
+        HAL_UART_IRQHandler(&context->handle);
+    }
+}
+
+// UART/USART IRQ handlers
+void USART1_IRQHandler(void) {
+    call_hal_irq(1);
+}
+
+void USART2_IRQHandler(void) {
+    call_hal_irq(2);
+}
+
+void USART3_IRQHandler(void) {
+    call_hal_irq(3);
+}
+
+void UART4_IRQHandler(void) {
+    call_hal_irq(4);
+}
+
+void UART5_IRQHandler(void) {
+    call_hal_irq(5);
+}
+
+void USART6_IRQHandler(void) {
+    call_hal_irq(6);
+}
+
+STATIC void uart_clock_enable(uint16_t mask) {
+    #ifdef USART1
+    if (mask & (1 << 0)) {
+        __HAL_RCC_USART1_FORCE_RESET();
+        __HAL_RCC_USART1_RELEASE_RESET();
+        __HAL_RCC_USART1_CLK_ENABLE();
+    }
+    #endif
+    #ifdef USART2
+    if (mask & (1 << 1)) {
+        __HAL_RCC_USART2_FORCE_RESET();
+        __HAL_RCC_USART2_RELEASE_RESET();
+        __HAL_RCC_USART2_CLK_ENABLE();
+    }
+    #endif
+    #ifdef USART3
+    if (mask & (1 << 2)) {
+        __HAL_RCC_USART3_FORCE_RESET();
+        __HAL_RCC_USART3_RELEASE_RESET();
+        __HAL_RCC_USART3_CLK_ENABLE();
+    }
+    #endif
+    #ifdef UART4
+    if (mask & (1 << 3)) {
+        __HAL_RCC_UART4_FORCE_RESET();
+        __HAL_RCC_UART4_RELEASE_RESET();
+        __HAL_RCC_UART4_CLK_ENABLE();
+    }
+    #endif
+    #ifdef UART5
+    if (mask & (1 << 4)) {
+        __HAL_RCC_UART5_FORCE_RESET();
+        __HAL_RCC_UART5_RELEASE_RESET();
+        __HAL_RCC_UART5_CLK_ENABLE();
+    }
+    #endif
+    #ifdef USART6
+    if (mask & (1 << 5)) {
+        __HAL_RCC_USART6_FORCE_RESET();
+        __HAL_RCC_USART6_RELEASE_RESET();
+        __HAL_RCC_USART6_CLK_ENABLE();
+    }
+    #endif
+    #ifdef UART7
+    if (mask & (1 << 6)) {
+        __HAL_RCC_UART7_FORCE_RESET();
+        __HAL_RCC_UART7_RELEASE_RESET();
+        __HAL_RCC_UART7_CLK_ENABLE();
+    }
+    #endif
+    #ifdef UART8
+    if (mask & (1 << 7)) {
+        __HAL_RCC_UART8_FORCE_RESET();
+        __HAL_RCC_UART8_RELEASE_RESET();
+        __HAL_RCC_UART8_CLK_ENABLE();
+    }
+    #endif
+    #ifdef UART9
+    if (mask & (1 << 8)) {
+        __HAL_RCC_UART9_FORCE_RESET();
+        __HAL_RCC_UART9_RELEASE_RESET();
+        __HAL_RCC_UART9_CLK_ENABLE();
+    }
+    #endif
+    #ifdef UART10
+    if (mask & (1 << 9)) {
+        __HAL_RCC_UART10_FORCE_RESET();
+        __HAL_RCC_UART10_RELEASE_RESET();
+        __HAL_RCC_UART10_CLK_ENABLE();
+    }
+    #endif
+}
+
+STATIC void uart_clock_disable(uint16_t mask) {
+    #ifdef USART1
+    if (mask & (1 << 0)) {
+        __HAL_RCC_USART1_FORCE_RESET();
+        __HAL_RCC_USART1_RELEASE_RESET();
+        __HAL_RCC_USART1_CLK_DISABLE();
+    }
+    #endif
+    #ifdef USART2
+    if (mask & (1 << 1)) {
+        __HAL_RCC_USART2_FORCE_RESET();
+        __HAL_RCC_USART2_RELEASE_RESET();
+        __HAL_RCC_USART2_CLK_DISABLE();
+    }
+    #endif
+    #ifdef USART3
+    if (mask & (1 << 2)) {
+        __HAL_RCC_USART3_FORCE_RESET();
+        __HAL_RCC_USART3_RELEASE_RESET();
+        __HAL_RCC_USART3_CLK_DISABLE();
+    }
+    #endif
+    #ifdef UART4
+    if (mask & (1 << 3)) {
+        __HAL_RCC_UART4_FORCE_RESET();
+        __HAL_RCC_UART4_RELEASE_RESET();
+        __HAL_RCC_UART4_CLK_DISABLE();
+    }
+    #endif
+    #ifdef UART5
+    if (mask & (1 << 4)) {
+        __HAL_RCC_UART5_FORCE_RESET();
+        __HAL_RCC_UART5_RELEASE_RESET();
+        __HAL_RCC_UART5_CLK_DISABLE();
+    }
+    #endif
+    #ifdef USART6
+    if (mask & (1 << 5)) {
+        __HAL_RCC_USART6_FORCE_RESET();
+        __HAL_RCC_USART6_RELEASE_RESET();
+        __HAL_RCC_USART6_CLK_DISABLE();
+    }
+    #endif
+    #ifdef UART7
+    if (mask & (1 << 6)) {
+        __HAL_RCC_UART7_FORCE_RESET();
+        __HAL_RCC_UART7_RELEASE_RESET();
+        __HAL_RCC_UART7_CLK_DISABLE();
+    }
+    #endif
+    #ifdef UART8
+    if (mask & (1 << 7)) {
+        __HAL_RCC_UART8_FORCE_RESET();
+        __HAL_RCC_UART8_RELEASE_RESET();
+        __HAL_RCC_UART8_CLK_DISABLE();
+    }
+    #endif
+    #ifdef UART9
+    if (mask & (1 << 8)) {
+        __HAL_RCC_UART9_FORCE_RESET();
+        __HAL_RCC_UART9_RELEASE_RESET();
+        __HAL_RCC_UART9_CLK_DISABLE();
+    }
+    #endif
+    #ifdef UART10
+    if (mask & (1 << 9)) {
+        __HAL_RCC_UART10_FORCE_RESET();
+        __HAL_RCC_UART10_RELEASE_RESET();
+        __HAL_RCC_UART10_CLK_DISABLE();
+    }
+    #endif
+}
+
+STATIC void uart_assign_irq(busio_uart_obj_t *self, USART_TypeDef * USARTx) {
+    #ifdef USART1
+    if (USARTx == USART1) {
+        self->irq = USART1_IRQn;
+    }
+    #endif
+    #ifdef USART2
+    if (USARTx == USART2) {
+        self->irq = USART2_IRQn;
+    }
+    #endif
+    #ifdef USART3
+    if (USARTx == USART3) {
+        self->irq = USART3_IRQn;
+    }
+    #endif
+    #ifdef UART4
+    if (USARTx == UART4) {
+        self->irq = UART4_IRQn;
+    }
+    #endif
+    #ifdef UART5
+    if (USARTx == UART5) {
+        self->irq = UART5_IRQn;
+    }
+    #endif
+    #ifdef USART6
+    if (USARTx == USART6) {
+        self->irq = USART6_IRQn;
+    }
+    #endif
+    #ifdef UART7
+    if (USARTx == UART7) {
+        self->irq = UART7_IRQn;
+    }
+    #endif
+    #ifdef UART8
+    if (USARTx == UART8) {
+        self->irq = UART8_IRQn;
+    }
+    #endif
+    #ifdef UART9
+    if (USARTx == UART9) {
+        self->irq = UART9_IRQn;
+    }
+    #endif
+    #ifdef UART10
+    if (USARTx == UART10) {
+        self->irq = UART10_IRQn;
+    }
+    #endif
+}
diff --git a/ports/stm/common-hal/busio/UART.h b/ports/stm/common-hal/busio/UART.h
new file mode 100644
index 000000000..cde5fadd0
--- /dev/null
+++ b/ports/stm/common-hal/busio/UART.h
@@ -0,0 +1,60 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_COMMON_HAL_BUSIO_UART_H
+#define MICROPY_INCLUDED_STM32F4_COMMON_HAL_BUSIO_UART_H
+
+#include "common-hal/microcontroller/Pin.h"
+#include "stm32f4/periph.h"
+#include "stm32f4xx_hal.h" 
+
+#include "py/obj.h"
+#include "py/ringbuf.h"
+
+#ifndef UART_IRQPRI
+#define UART_IRQPRI       1
+#endif
+#ifndef UART_IRQSUB_PRI
+#define UART_IRQSUB_PRI    0
+#endif
+
+typedef struct {
+    mp_obj_base_t base;
+    UART_HandleTypeDef handle;
+    IRQn_Type irq;
+    const mcu_uart_tx_obj_t *tx;
+    const mcu_uart_rx_obj_t *rx;
+
+    ringbuf_t rbuf;
+    uint8_t rx_char;
+
+    uint32_t baudrate;
+    uint32_t timeout_ms;
+} busio_uart_obj_t;
+
+void uart_reset(void);
+
+#endif // MICROPY_INCLUDED_STM32F4_COMMON_HAL_BUSIO_UART_H
diff --git a/ports/stm/common-hal/busio/__init__.c b/ports/stm/common-hal/busio/__init__.c
new file mode 100644
index 000000000..41761b674
--- /dev/null
+++ b/ports/stm/common-hal/busio/__init__.c
@@ -0,0 +1 @@
+// No busio module functions.
diff --git a/ports/stm/common-hal/digitalio/DigitalInOut.c b/ports/stm/common-hal/digitalio/DigitalInOut.c
new file mode 100644
index 000000000..be2db4dac
--- /dev/null
+++ b/ports/stm/common-hal/digitalio/DigitalInOut.c
@@ -0,0 +1,160 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "shared-bindings/digitalio/DigitalInOut.h"
+#include "py/runtime.h"
+#include "supervisor/shared/translate.h"
+
+#include "stm32f4xx_hal.h"
+#include "stm32f4xx_ll_gpio.h"
+
+void common_hal_digitalio_digitalinout_never_reset(
+        digitalio_digitalinout_obj_t *self) {
+    never_reset_pin_number(self->pin->port, self->pin->number);
+}
+
+digitalinout_result_t common_hal_digitalio_digitalinout_construct(
+        digitalio_digitalinout_obj_t *self, const mcu_pin_obj_t *pin) {
+
+    claim_pin(pin);
+    self->pin = pin;
+
+    GPIO_InitTypeDef GPIO_InitStruct = {0};
+    GPIO_InitStruct.Pin = pin_mask(self->pin->number);
+    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+    HAL_GPIO_Init(pin_port(self->pin->port), &GPIO_InitStruct);
+
+    return DIGITALINOUT_OK;
+}
+
+bool common_hal_digitalio_digitalinout_deinited(digitalio_digitalinout_obj_t *self) {
+    return self->pin == NULL;
+}
+
+void common_hal_digitalio_digitalinout_deinit(digitalio_digitalinout_obj_t *self) {
+    if (common_hal_digitalio_digitalinout_deinited(self)) {
+        return;
+    }
+
+    reset_pin_number(self->pin->port, self->pin->number);
+    self->pin = NULL;
+}
+
+void common_hal_digitalio_digitalinout_switch_to_input(
+        digitalio_digitalinout_obj_t *self, digitalio_pull_t pull) {
+
+    GPIO_InitTypeDef GPIO_InitStruct = {0};
+    GPIO_InitStruct.Pin = pin_mask(self->pin->number);
+    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+    HAL_GPIO_Init(pin_port(self->pin->port), &GPIO_InitStruct);
+
+    common_hal_digitalio_digitalinout_set_pull(self, pull);
+}
+
+void common_hal_digitalio_digitalinout_switch_to_output(
+        digitalio_digitalinout_obj_t *self, bool value,
+        digitalio_drive_mode_t drive_mode) {
+
+    common_hal_digitalio_digitalinout_set_drive_mode(self, drive_mode);
+    common_hal_digitalio_digitalinout_set_value(self, value);
+}
+
+digitalio_direction_t common_hal_digitalio_digitalinout_get_direction(
+        digitalio_digitalinout_obj_t *self) {
+
+    return (LL_GPIO_GetPinMode(pin_port(self->pin->port), pin_mask(self->pin->number))
+        == LL_GPIO_MODE_INPUT) ? DIRECTION_INPUT : DIRECTION_OUTPUT;
+}
+
+void common_hal_digitalio_digitalinout_set_value(
+        digitalio_digitalinout_obj_t *self, bool value) {
+    HAL_GPIO_WritePin(pin_port(self->pin->port), pin_mask(self->pin->number), value);
+}
+
+bool common_hal_digitalio_digitalinout_get_value(
+        digitalio_digitalinout_obj_t *self) {
+    return (LL_GPIO_GetPinMode(pin_port(self->pin->port), pin_mask(self->pin->number)) == LL_GPIO_MODE_INPUT)
+        ? HAL_GPIO_ReadPin(pin_port(self->pin->port), pin_mask(self->pin->number))
+        : LL_GPIO_IsOutputPinSet(pin_port(self->pin->port), pin_mask(self->pin->number));
+}
+
+void common_hal_digitalio_digitalinout_set_drive_mode(
+        digitalio_digitalinout_obj_t *self,
+        digitalio_drive_mode_t drive_mode) {
+    GPIO_InitTypeDef GPIO_InitStruct = {0};
+    GPIO_InitStruct.Pin = pin_mask(self->pin->number);
+    GPIO_InitStruct.Mode = (drive_mode == DRIVE_MODE_OPEN_DRAIN ?
+        GPIO_MODE_OUTPUT_OD : GPIO_MODE_OUTPUT_PP);
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+    HAL_GPIO_Init(pin_port(self->pin->port), &GPIO_InitStruct);
+}
+
+digitalio_drive_mode_t common_hal_digitalio_digitalinout_get_drive_mode(
+        digitalio_digitalinout_obj_t *self) {
+
+    return LL_GPIO_GetPinOutputType(pin_port(self->pin->port), pin_mask(self->pin->number))
+        == LL_GPIO_OUTPUT_OPENDRAIN ? DRIVE_MODE_OPEN_DRAIN : DRIVE_MODE_PUSH_PULL;
+}
+
+void common_hal_digitalio_digitalinout_set_pull(
+        digitalio_digitalinout_obj_t *self, digitalio_pull_t pull) {
+
+    switch (pull) {
+        case PULL_UP:
+            LL_GPIO_SetPinPull(pin_port(self->pin->port), pin_mask(self->pin->number),LL_GPIO_PULL_UP);
+            break;
+        case PULL_DOWN:
+            LL_GPIO_SetPinPull(pin_port(self->pin->port), pin_mask(self->pin->number),LL_GPIO_PULL_DOWN);
+            break;
+        case PULL_NONE:
+            LL_GPIO_SetPinPull(pin_port(self->pin->port), pin_mask(self->pin->number),LL_GPIO_PULL_NO);
+            break;
+        default:
+            break;
+    }
+}
+
+digitalio_pull_t common_hal_digitalio_digitalinout_get_pull(
+        digitalio_digitalinout_obj_t *self) {
+
+
+    switch (LL_GPIO_GetPinPull(pin_port(self->pin->port), pin_mask(self->pin->number))) {
+        case LL_GPIO_PULL_UP:
+            return PULL_UP;
+        case LL_GPIO_PULL_DOWN:
+            return PULL_DOWN;
+        case LL_GPIO_PULL_NO:
+            return PULL_NONE;
+        default:
+            return PULL_NONE;
+    }
+}
diff --git a/ports/stm/common-hal/digitalio/DigitalInOut.h b/ports/stm/common-hal/digitalio/DigitalInOut.h
new file mode 100644
index 000000000..76aa2c855
--- /dev/null
+++ b/ports/stm/common-hal/digitalio/DigitalInOut.h
@@ -0,0 +1,38 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_COMMON_HAL_DIGITALIO_DIGITALINOUT_H
+#define MICROPY_INCLUDED_STM32F4_COMMON_HAL_DIGITALIO_DIGITALINOUT_H
+
+#include "common-hal/microcontroller/Pin.h"
+
+typedef struct {
+    mp_obj_base_t base;
+    const mcu_pin_obj_t *pin;
+} digitalio_digitalinout_obj_t;
+
+#endif // MICROPY_INCLUDED_STM32F4_COMMON_HAL_DIGITALIO_DIGITALINOUT_H
diff --git a/ports/stm/common-hal/digitalio/__init__.c b/ports/stm/common-hal/digitalio/__init__.c
new file mode 100644
index 000000000..20fad4595
--- /dev/null
+++ b/ports/stm/common-hal/digitalio/__init__.c
@@ -0,0 +1 @@
+// No digitalio module functions.
diff --git a/ports/stm/common-hal/displayio/ParallelBus.c b/ports/stm/common-hal/displayio/ParallelBus.c
new file mode 100644
index 000000000..1b808ec02
--- /dev/null
+++ b/ports/stm/common-hal/displayio/ParallelBus.c
@@ -0,0 +1,68 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "shared-bindings/displayio/ParallelBus.h"
+
+#include <stdint.h>
+
+#include "common-hal/microcontroller/Pin.h"
+#include "py/runtime.h"
+#include "shared-bindings/digitalio/DigitalInOut.h"
+#include "shared-bindings/microcontroller/__init__.h"
+
+#include "tick.h"
+
+void common_hal_displayio_parallelbus_construct(displayio_parallelbus_obj_t* self,
+    const mcu_pin_obj_t* data0, const mcu_pin_obj_t* command, const mcu_pin_obj_t* chip_select,
+    const mcu_pin_obj_t* write, const mcu_pin_obj_t* read, const mcu_pin_obj_t* reset) {
+
+    mp_raise_NotImplementedError(translate("ParallelBus not yet supported"));
+}
+
+void common_hal_displayio_parallelbus_deinit(displayio_parallelbus_obj_t* self) {
+
+}
+
+bool common_hal_displayio_parallelbus_reset(mp_obj_t obj) {
+	return false;
+}
+
+bool common_hal_displayio_parallelbus_bus_free(mp_obj_t obj) {
+    return false;
+}
+
+bool common_hal_displayio_parallelbus_begin_transaction(mp_obj_t obj) {
+
+    return false;
+}
+
+void common_hal_displayio_parallelbus_send(mp_obj_t obj, display_byte_type_t byte_type, display_chip_select_behavior_t chip_select, uint8_t *data, uint32_t data_length) {
+
+}
+
+void common_hal_displayio_parallelbus_end_transaction(mp_obj_t obj) {
+
+}
diff --git a/ports/stm/common-hal/displayio/ParallelBus.h b/ports/stm/common-hal/displayio/ParallelBus.h
new file mode 100644
index 000000000..85d100715
--- /dev/null
+++ b/ports/stm/common-hal/displayio/ParallelBus.h
@@ -0,0 +1,36 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_COMMON_HAL_DISPLAYIO_PARALLELBUS_H
+#define MICROPY_INCLUDED_STM32F4_COMMON_HAL_DISPLAYIO_PARALLELBUS_H
+
+#include "common-hal/digitalio/DigitalInOut.h"
+
+typedef struct {
+    mp_obj_base_t base;
+} displayio_parallelbus_obj_t;
+
+#endif // MICROPY_INCLUDED_STM32F4_COMMON_HAL_DISPLAYIO_PARALLELBUS_H
diff --git a/ports/stm/common-hal/microcontroller/Pin.c b/ports/stm/common-hal/microcontroller/Pin.c
new file mode 100644
index 000000000..1d4d45b97
--- /dev/null
+++ b/ports/stm/common-hal/microcontroller/Pin.c
@@ -0,0 +1,134 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft for Adafruit Industries
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/digitalio/DigitalInOut.h"
+#include "supervisor/shared/rgb_led_status.h"
+
+#include "py/mphal.h"
+#include "stm32f4/pins.h"
+#include "stm32f4xx_hal.h"
+
+#ifdef MICROPY_HW_NEOPIXEL
+bool neopixel_in_use;
+#endif
+
+#if MCU_PACKAGE == 144
+    #define GPIO_PORT_COUNT 7
+    GPIO_TypeDef * ports[GPIO_PORT_COUNT] = {GPIOA, GPIOB, GPIOC, GPIOD, GPIOE, GPIOF, GPIOG};
+#elif MCU_PACKAGE == 100
+    #define GPIO_PORT_COUNT 5
+    GPIO_TypeDef * ports[GPIO_PORT_COUNT] = {GPIOA, GPIOB, GPIOC, GPIOD, GPIOE};
+#elif MCU_PACKAGE == 64
+    #define GPIO_PORT_COUNT 3
+    GPIO_TypeDef * ports[GPIO_PORT_COUNT] = {GPIOA, GPIOB, GPIOC};
+#elif MCU_PACKAGE == 48
+    #define GPIO_PORT_COUNT 3
+    GPIO_TypeDef * ports[GPIO_PORT_COUNT] = {GPIOA, GPIOB, GPIOC};
+#endif
+
+
+STATIC uint16_t claimed_pins[GPIO_PORT_COUNT];
+STATIC uint16_t never_reset_pins[GPIO_PORT_COUNT];
+
+void reset_all_pins(void) {
+    // Reset claimed pins
+    for (uint8_t i = 0; i < GPIO_PORT_COUNT; i++) {
+        claimed_pins[i] = never_reset_pins[i];
+    }
+    for (uint8_t i = 0; i < GPIO_PORT_COUNT; i++) {
+        HAL_GPIO_DeInit(ports[i], ~never_reset_pins[i]);
+    }
+
+    #ifdef MICROPY_HW_NEOPIXEL
+    neopixel_in_use = false;
+    #endif
+}
+
+// Mark pin as free and return it to a quiescent state.
+void reset_pin_number(uint8_t pin_port, uint8_t pin_number) {
+    if (pin_port == 0x0F) {
+        return;
+    }
+    // Clear claimed bit & reset
+    claimed_pins[pin_port] &= ~(1<<pin_number);
+    never_reset_pins[pin_port] &= ~(1<<pin_number);
+    HAL_GPIO_DeInit(ports[pin_port], 1<<pin_number);
+
+    #ifdef MICROPY_HW_NEOPIXEL
+    if (pin_port == MICROPY_HW_NEOPIXEL->port && pin_number == MICROPY_HW_NEOPIXEL->number) {
+        neopixel_in_use = false;
+        rgb_led_status_init();
+        return;
+    }
+    #endif
+}
+
+void never_reset_pin_number(uint8_t pin_port, uint8_t pin_number) {
+    never_reset_pins[pin_port] |= 1<<pin_number;
+}
+
+void common_hal_never_reset_pin(const mcu_pin_obj_t* pin) {
+    never_reset_pin_number(pin->port, pin->number);
+}
+
+void common_hal_reset_pin(const mcu_pin_obj_t* pin) {
+    reset_pin_number(pin->port, pin->number);
+}
+
+void claim_pin(const mcu_pin_obj_t* pin) {
+    // Set bit in claimed_pins bitmask.
+    claimed_pins[pin->port] |= 1<<pin->number;
+
+    #ifdef MICROPY_HW_NEOPIXEL
+    if (pin == MICROPY_HW_NEOPIXEL) {
+        neopixel_in_use = true;
+    }
+    #endif
+}
+
+bool pin_number_is_free(uint8_t pin_port, uint8_t pin_number) {
+    return !(claimed_pins[pin_port] & 1<<pin_number);
+}
+
+bool common_hal_mcu_pin_is_free(const mcu_pin_obj_t *pin) {
+    #ifdef MICROPY_HW_NEOPIXEL
+    if (pin == MICROPY_HW_NEOPIXEL) {
+        return !neopixel_in_use;
+    }
+    #endif
+
+    return pin_number_is_free(pin->port, pin->number);
+}
+
+GPIO_TypeDef * pin_port(uint8_t pin_port) {
+    return ports[pin_port];
+}
+
+uint16_t pin_mask(uint8_t pin_number) {
+    return 1<<pin_number;
+}
diff --git a/ports/stm/common-hal/microcontroller/Pin.h b/ports/stm/common-hal/microcontroller/Pin.h
new file mode 100644
index 000000000..c4c9be6a8
--- /dev/null
+++ b/ports/stm/common-hal/microcontroller/Pin.h
@@ -0,0 +1,52 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM34F4_COMMON_HAL_MICROCONTROLLER_PIN_H
+#define MICROPY_INCLUDED_STM34F4_COMMON_HAL_MICROCONTROLLER_PIN_H
+
+#include "py/mphal.h"
+
+#include "peripherals/stm32f4/pins.h"
+
+#ifdef MICROPY_HW_NEOPIXEL
+extern bool neopixel_in_use;
+#endif
+#ifdef MICROPY_HW_APA102_MOSI
+extern bool apa102_sck_in_use;
+extern bool apa102_mosi_in_use;
+#endif
+
+void reset_all_pins(void);
+// reset_pin_number takes the pin number instead of the pointer so that objects don't
+// need to store a full pointer.
+void reset_pin_number(uint8_t pin_port, uint8_t pin_number);
+void claim_pin(const mcu_pin_obj_t* pin);
+bool pin_number_is_free(uint8_t pin_port, uint8_t pin_number);
+void never_reset_pin_number(uint8_t pin_port, uint8_t pin_number);
+GPIO_TypeDef * pin_port(uint8_t pin_port);
+uint16_t pin_mask(uint8_t pin_number);
+
+#endif // MICROPY_INCLUDED_STM34F4_COMMON_HAL_MICROCONTROLLER_PIN_H
diff --git a/ports/stm/common-hal/microcontroller/Processor.c b/ports/stm/common-hal/microcontroller/Processor.c
new file mode 100644
index 000000000..324659cef
--- /dev/null
+++ b/ports/stm/common-hal/microcontroller/Processor.c
@@ -0,0 +1,127 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <math.h>
+#include "common-hal/microcontroller/Processor.h"
+#include "py/runtime.h"
+#include "supervisor/shared/translate.h"
+
+#include "stm32f4xx_hal.h"
+
+#define STM32_UUID ((uint32_t *)0x1FFF7A10)
+
+//Factory calibration locations
+#define ADC_CAL_ADDRESS         (0x1fff7a2a)
+#define ADC_CAL1                ((uint16_t*)(ADC_CAL_ADDRESS + 2))
+#define ADC_CAL2                ((uint16_t*)(ADC_CAL_ADDRESS + 4))
+#define VREFIN_CAL ((uint16_t *)ADC_CAL_ADDRESS)
+
+// correction factor for reference value
+STATIC volatile float adc_refcor = 1.0f;
+
+STATIC void set_adc_params(ADC_HandleTypeDef *AdcHandle) {
+    AdcHandle->Instance = ADC1;
+    AdcHandle->Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
+    AdcHandle->Init.Resolution = ADC_RESOLUTION_12B;
+    AdcHandle->Init.ScanConvMode = DISABLE;
+    AdcHandle->Init.ContinuousConvMode = DISABLE;
+    AdcHandle->Init.DiscontinuousConvMode = DISABLE;
+    AdcHandle->Init.NbrOfDiscConversion = 0;
+    AdcHandle->Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
+    AdcHandle->Init.ExternalTrigConv = ADC_SOFTWARE_START;
+    AdcHandle->Init.DataAlign = ADC_DATAALIGN_RIGHT;
+    AdcHandle->Init.NbrOfConversion = 1;
+    AdcHandle->Init.DMAContinuousRequests = DISABLE;
+    AdcHandle->Init.EOCSelection = ADC_EOC_SINGLE_CONV;
+}
+
+float common_hal_mcu_processor_get_temperature(void) {
+    __HAL_RCC_ADC1_CLK_ENABLE();
+
+    //HAL Implementation
+    ADC_HandleTypeDef AdcHandle;
+    ADC_ChannelConfTypeDef sConfig;
+    set_adc_params(&AdcHandle);
+    HAL_ADC_Init(&AdcHandle);
+
+    ADC->CCR |= ADC_CCR_TSVREFE;
+    ADC->CCR &= ~ADC_CCR_VBATE; // If this somehow got turned on, it'll return bad values. 
+
+    sConfig.Channel = ADC_CHANNEL_TEMPSENSOR; //either 16 or 18, depending on chip
+    sConfig.Rank = 1;
+    sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES; // Temp sensor likes 10us minimum
+    HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
+
+    HAL_ADC_Start(&AdcHandle);
+    if (HAL_ADC_PollForConversion(&AdcHandle,1) != HAL_OK) {
+        mp_raise_RuntimeError(translate("Temperature read timed out"));
+    }
+    uint32_t value = (uint32_t)HAL_ADC_GetValue(&AdcHandle);
+    HAL_ADC_Stop(&AdcHandle);
+
+    //There's no F4 specific appnote for this but it works the same as the L1 in AN3964
+    float core_temp_avg_slope = (*ADC_CAL2 - *ADC_CAL1) / 80.0;
+    return (((float)value * adc_refcor - *ADC_CAL1) / core_temp_avg_slope) + 30.0f;
+}
+
+float common_hal_mcu_processor_get_voltage(void) {
+    __HAL_RCC_ADC1_CLK_ENABLE();
+
+    //HAL Implementation
+    ADC_HandleTypeDef AdcHandle;
+    ADC_ChannelConfTypeDef sConfig;
+    set_adc_params(&AdcHandle);
+    HAL_ADC_Init(&AdcHandle);
+
+    ADC->CCR |= ADC_CCR_TSVREFE;
+
+    sConfig.Channel = ADC_CHANNEL_VREFINT;
+    sConfig.Rank = 1;
+    sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES;
+    HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
+
+    HAL_ADC_Start(&AdcHandle);
+    if (HAL_ADC_PollForConversion(&AdcHandle,1) != HAL_OK) {
+        mp_raise_RuntimeError(translate("Voltage read timed out"));
+    }
+    uint32_t value = (uint32_t)HAL_ADC_GetValue(&AdcHandle);
+    HAL_ADC_Stop(&AdcHandle);
+
+    //This value could be used to actively correct ADC values. 
+    adc_refcor = ((float)(*VREFIN_CAL)) / ((float)value);
+
+    return adc_refcor * 3.3f;
+}
+
+uint32_t common_hal_mcu_processor_get_frequency(void) {
+    return SystemCoreClock;
+}
+
+void common_hal_mcu_processor_get_uid(uint8_t raw_id[]) {
+    for (int i=0; i<3; i++) {
+        ((uint32_t*) raw_id)[i] = STM32_UUID[i];
+    }
+}
diff --git a/ports/stm/common-hal/microcontroller/Processor.h b/ports/stm/common-hal/microcontroller/Processor.h
new file mode 100644
index 000000000..311333e7d
--- /dev/null
+++ b/ports/stm/common-hal/microcontroller/Processor.h
@@ -0,0 +1,39 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Dan  Halbert for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_COMMON_HAL_MICROCONTROLLER_PROCESSOR_H
+#define MICROPY_INCLUDED_STM32F4_COMMON_HAL_MICROCONTROLLER_PROCESSOR_H
+
+#define COMMON_HAL_MCU_PROCESSOR_UID_LENGTH 12
+
+#include "py/obj.h"
+
+typedef struct {
+    mp_obj_base_t base;
+    // Stores no state currently.
+} mcu_processor_obj_t;
+
+#endif // MICROPY_INCLUDED_STM32F4_COMMON_HAL_MICROCONTROLLER_PROCESSOR_H
diff --git a/ports/stm/common-hal/microcontroller/__init__.c b/ports/stm/common-hal/microcontroller/__init__.c
new file mode 100644
index 000000000..0c680eb05
--- /dev/null
+++ b/ports/stm/common-hal/microcontroller/__init__.c
@@ -0,0 +1,244 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft for Adafruit Industries
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/mphal.h"
+#include "py/obj.h"
+#include "py/runtime.h"
+
+#include "common-hal/microcontroller/Pin.h"
+#include "common-hal/microcontroller/Processor.h"
+
+#include "shared-bindings/microcontroller/__init__.h"
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/microcontroller/Processor.h"
+
+#include "supervisor/filesystem.h"
+#include "supervisor/shared/safe_mode.h"
+
+#include "stm32f4xx_hal.h"
+
+//tested divisor value for busy loop in us delay
+#define LOOP_TICKS 12
+
+STATIC uint32_t get_us(void) {
+    uint32_t ticks_per_us = HAL_RCC_GetSysClockFreq()/1000000;
+    uint32_t micros, sys_cycles;
+    do {
+        micros = supervisor_ticks_ms32();
+        sys_cycles = SysTick->VAL; //counts backwards
+    } while (micros != supervisor_ticks_ms32()); //try again if ticks_ms rolled over
+    return (micros * 1000) + (ticks_per_us * 1000 - sys_cycles) / ticks_per_us;
+}
+
+void common_hal_mcu_delay_us(uint32_t delay) {
+    if (__get_PRIMASK() == 0x00000000) {
+        //by default use ticks_ms
+        uint32_t start = get_us();
+        while (get_us()-start < delay) {
+            __asm__ __volatile__("nop");
+        }
+    } else {
+        //when SysTick is disabled, approximate with busy loop
+        const uint32_t ucount = HAL_RCC_GetSysClockFreq() / 1000000 * delay / LOOP_TICKS;
+        for (uint32_t count = 0; ++count <= ucount;) {
+        }
+    }
+}
+
+volatile uint32_t nesting_count = 0;
+
+void common_hal_mcu_disable_interrupts(void) {
+    __disable_irq();
+    __DMB();
+    nesting_count++;
+}
+
+void common_hal_mcu_enable_interrupts(void) {
+    if (nesting_count == 0) {
+        // This is very very bad because it means there was mismatched disable/enables so we
+        // "HardFault".
+        asm("bkpt");
+    }
+    nesting_count--;
+    if (nesting_count > 0) {
+        return;
+    }
+    __DMB();
+    __enable_irq();
+}
+
+void common_hal_mcu_on_next_reset(mcu_runmode_t runmode) {
+  if(runmode == RUNMODE_SAFE_MODE)
+    safe_mode_on_next_reset(PROGRAMMATIC_SAFE_MODE);
+}
+
+void common_hal_mcu_reset(void) {
+    filesystem_flush(); //TODO: implement as part of flash improvements
+    NVIC_SystemReset();
+}
+
+// The singleton microcontroller.Processor object, bound to microcontroller.cpu
+// It currently only has properties, and no state.
+const mcu_processor_obj_t common_hal_mcu_processor_obj = {
+    .base = {
+        .type = &mcu_processor_type,
+    },
+};
+
+STATIC const mp_rom_map_elem_t mcu_pin_globals_table[] = {
+#if MCU_PACKAGE >= 100
+  { MP_ROM_QSTR(MP_QSTR_PE02), MP_ROM_PTR(&pin_PE02) },
+  { MP_ROM_QSTR(MP_QSTR_PE03), MP_ROM_PTR(&pin_PE03) },
+  { MP_ROM_QSTR(MP_QSTR_PE04), MP_ROM_PTR(&pin_PE04) },
+  { MP_ROM_QSTR(MP_QSTR_PE05), MP_ROM_PTR(&pin_PE05) },
+  { MP_ROM_QSTR(MP_QSTR_PE06), MP_ROM_PTR(&pin_PE06) },
+#endif
+  { MP_ROM_QSTR(MP_QSTR_PC13), MP_ROM_PTR(&pin_PC13) },
+#if MCU_PACKAGE == 144
+  { MP_ROM_QSTR(MP_QSTR_PF00), MP_ROM_PTR(&pin_PF00) },
+  { MP_ROM_QSTR(MP_QSTR_PF01), MP_ROM_PTR(&pin_PF01) },
+  { MP_ROM_QSTR(MP_QSTR_PF02), MP_ROM_PTR(&pin_PF02) },
+  { MP_ROM_QSTR(MP_QSTR_PF03), MP_ROM_PTR(&pin_PF03) },
+  { MP_ROM_QSTR(MP_QSTR_PF04), MP_ROM_PTR(&pin_PF04) },
+  { MP_ROM_QSTR(MP_QSTR_PF05), MP_ROM_PTR(&pin_PF05) },
+  { MP_ROM_QSTR(MP_QSTR_PF06), MP_ROM_PTR(&pin_PF06) },
+  { MP_ROM_QSTR(MP_QSTR_PF07), MP_ROM_PTR(&pin_PF07) },
+  { MP_ROM_QSTR(MP_QSTR_PF08), MP_ROM_PTR(&pin_PF08) },
+  { MP_ROM_QSTR(MP_QSTR_PF09), MP_ROM_PTR(&pin_PF09) },
+  { MP_ROM_QSTR(MP_QSTR_PF10), MP_ROM_PTR(&pin_PF10) },
+#endif
+  { MP_ROM_QSTR(MP_QSTR_PC00), MP_ROM_PTR(&pin_PC00) },
+  { MP_ROM_QSTR(MP_QSTR_PC01), MP_ROM_PTR(&pin_PC01) },
+  { MP_ROM_QSTR(MP_QSTR_PC02), MP_ROM_PTR(&pin_PC02) },
+  { MP_ROM_QSTR(MP_QSTR_PC03), MP_ROM_PTR(&pin_PC03) },
+  { MP_ROM_QSTR(MP_QSTR_PA00), MP_ROM_PTR(&pin_PA00) },
+  { MP_ROM_QSTR(MP_QSTR_PA01), MP_ROM_PTR(&pin_PA01) },
+  { MP_ROM_QSTR(MP_QSTR_PA02), MP_ROM_PTR(&pin_PA02) },
+  { MP_ROM_QSTR(MP_QSTR_PA03), MP_ROM_PTR(&pin_PA03) },
+  { MP_ROM_QSTR(MP_QSTR_PA04), MP_ROM_PTR(&pin_PA04) },
+  { MP_ROM_QSTR(MP_QSTR_PA05), MP_ROM_PTR(&pin_PA05) },
+  { MP_ROM_QSTR(MP_QSTR_PA06), MP_ROM_PTR(&pin_PA06) },
+  { MP_ROM_QSTR(MP_QSTR_PA07), MP_ROM_PTR(&pin_PA07) },
+  { MP_ROM_QSTR(MP_QSTR_PC04), MP_ROM_PTR(&pin_PC04) },
+  { MP_ROM_QSTR(MP_QSTR_PC05), MP_ROM_PTR(&pin_PC05) },
+  { MP_ROM_QSTR(MP_QSTR_PB00), MP_ROM_PTR(&pin_PB00) },
+  { MP_ROM_QSTR(MP_QSTR_PB01), MP_ROM_PTR(&pin_PB01) },
+  { MP_ROM_QSTR(MP_QSTR_PB02), MP_ROM_PTR(&pin_PB02) },
+#if MCU_PACKAGE == 144
+  { MP_ROM_QSTR(MP_QSTR_PF11), MP_ROM_PTR(&pin_PF11) },
+  { MP_ROM_QSTR(MP_QSTR_PF12), MP_ROM_PTR(&pin_PF12) },
+  { MP_ROM_QSTR(MP_QSTR_PF13), MP_ROM_PTR(&pin_PF13) },
+  { MP_ROM_QSTR(MP_QSTR_PF14), MP_ROM_PTR(&pin_PF14) },
+  { MP_ROM_QSTR(MP_QSTR_PF15), MP_ROM_PTR(&pin_PF15) },
+  { MP_ROM_QSTR(MP_QSTR_PG00), MP_ROM_PTR(&pin_PG00) },
+  { MP_ROM_QSTR(MP_QSTR_PG01), MP_ROM_PTR(&pin_PG01) },
+#endif
+#if MCU_PACKAGE >= 100
+  { MP_ROM_QSTR(MP_QSTR_PE07), MP_ROM_PTR(&pin_PE07) },
+  { MP_ROM_QSTR(MP_QSTR_PE08), MP_ROM_PTR(&pin_PE08) },
+  { MP_ROM_QSTR(MP_QSTR_PE09), MP_ROM_PTR(&pin_PE09) },
+  { MP_ROM_QSTR(MP_QSTR_PE10), MP_ROM_PTR(&pin_PE10) },
+  { MP_ROM_QSTR(MP_QSTR_PE11), MP_ROM_PTR(&pin_PE11) },
+  { MP_ROM_QSTR(MP_QSTR_PE12), MP_ROM_PTR(&pin_PE12) },
+  { MP_ROM_QSTR(MP_QSTR_PE13), MP_ROM_PTR(&pin_PE13) },
+  { MP_ROM_QSTR(MP_QSTR_PE14), MP_ROM_PTR(&pin_PE14) },
+  { MP_ROM_QSTR(MP_QSTR_PE15), MP_ROM_PTR(&pin_PE15) },
+#endif
+  { MP_ROM_QSTR(MP_QSTR_PB10), MP_ROM_PTR(&pin_PB10) },
+#if MCU_PACKAGE == 144 || defined STM32F405xx
+  { MP_ROM_QSTR(MP_QSTR_PB11), MP_ROM_PTR(&pin_PB11) },
+#endif  
+  { MP_ROM_QSTR(MP_QSTR_PB12), MP_ROM_PTR(&pin_PB12) },
+  { MP_ROM_QSTR(MP_QSTR_PB13), MP_ROM_PTR(&pin_PB13) },
+  { MP_ROM_QSTR(MP_QSTR_PB14), MP_ROM_PTR(&pin_PB14) },
+  { MP_ROM_QSTR(MP_QSTR_PB15), MP_ROM_PTR(&pin_PB15) },
+#if MCU_PACKAGE >= 100
+  { MP_ROM_QSTR(MP_QSTR_PD08), MP_ROM_PTR(&pin_PD08) },
+  { MP_ROM_QSTR(MP_QSTR_PD09), MP_ROM_PTR(&pin_PD09) },
+  { MP_ROM_QSTR(MP_QSTR_PD10), MP_ROM_PTR(&pin_PD10) },
+  { MP_ROM_QSTR(MP_QSTR_PD11), MP_ROM_PTR(&pin_PD11) },
+  { MP_ROM_QSTR(MP_QSTR_PD12), MP_ROM_PTR(&pin_PD12) },
+  { MP_ROM_QSTR(MP_QSTR_PD13), MP_ROM_PTR(&pin_PD13) },
+  { MP_ROM_QSTR(MP_QSTR_PD14), MP_ROM_PTR(&pin_PD14) },
+  { MP_ROM_QSTR(MP_QSTR_PD15), MP_ROM_PTR(&pin_PD15) },
+#endif
+#if MCU_PACKAGE == 144
+  { MP_ROM_QSTR(MP_QSTR_PG02), MP_ROM_PTR(&pin_PG02) },
+  { MP_ROM_QSTR(MP_QSTR_PG03), MP_ROM_PTR(&pin_PG03) },
+  { MP_ROM_QSTR(MP_QSTR_PG04), MP_ROM_PTR(&pin_PG04) },
+  { MP_ROM_QSTR(MP_QSTR_PG05), MP_ROM_PTR(&pin_PG05) },
+  { MP_ROM_QSTR(MP_QSTR_PG06), MP_ROM_PTR(&pin_PG06) },
+  { MP_ROM_QSTR(MP_QSTR_PG07), MP_ROM_PTR(&pin_PG07) },
+  { MP_ROM_QSTR(MP_QSTR_PG08), MP_ROM_PTR(&pin_PG08) },
+#endif
+  { MP_ROM_QSTR(MP_QSTR_PC06), MP_ROM_PTR(&pin_PC06) },
+  { MP_ROM_QSTR(MP_QSTR_PC07), MP_ROM_PTR(&pin_PC07) },
+  { MP_ROM_QSTR(MP_QSTR_PC08), MP_ROM_PTR(&pin_PC08) },
+  { MP_ROM_QSTR(MP_QSTR_PC09), MP_ROM_PTR(&pin_PC09) },
+  { MP_ROM_QSTR(MP_QSTR_PA08), MP_ROM_PTR(&pin_PA08) },
+  { MP_ROM_QSTR(MP_QSTR_PA09), MP_ROM_PTR(&pin_PA09) },
+  { MP_ROM_QSTR(MP_QSTR_PA10), MP_ROM_PTR(&pin_PA10) },
+  { MP_ROM_QSTR(MP_QSTR_PA11), MP_ROM_PTR(&pin_PA11) },
+  { MP_ROM_QSTR(MP_QSTR_PA12), MP_ROM_PTR(&pin_PA12) },
+  { MP_ROM_QSTR(MP_QSTR_PA13), MP_ROM_PTR(&pin_PA13) },
+  { MP_ROM_QSTR(MP_QSTR_PA14), MP_ROM_PTR(&pin_PA14) },
+  { MP_ROM_QSTR(MP_QSTR_PA15), MP_ROM_PTR(&pin_PA15) },
+  { MP_ROM_QSTR(MP_QSTR_PC10), MP_ROM_PTR(&pin_PC10) },
+  { MP_ROM_QSTR(MP_QSTR_PC11), MP_ROM_PTR(&pin_PC11) },
+  { MP_ROM_QSTR(MP_QSTR_PC12), MP_ROM_PTR(&pin_PC12) },
+#if MCU_PACKAGE >= 100
+  { MP_ROM_QSTR(MP_QSTR_PD00), MP_ROM_PTR(&pin_PD00) },
+  { MP_ROM_QSTR(MP_QSTR_PD01), MP_ROM_PTR(&pin_PD01) },
+  { MP_ROM_QSTR(MP_QSTR_PD02), MP_ROM_PTR(&pin_PD02) },
+  { MP_ROM_QSTR(MP_QSTR_PD03), MP_ROM_PTR(&pin_PD03) },
+  { MP_ROM_QSTR(MP_QSTR_PD04), MP_ROM_PTR(&pin_PD04) },
+  { MP_ROM_QSTR(MP_QSTR_PD05), MP_ROM_PTR(&pin_PD05) },
+  { MP_ROM_QSTR(MP_QSTR_PD06), MP_ROM_PTR(&pin_PD06) },
+  { MP_ROM_QSTR(MP_QSTR_PD07), MP_ROM_PTR(&pin_PD07) },
+#endif
+#if MCU_PACKAGE == 144
+  { MP_ROM_QSTR(MP_QSTR_PG09), MP_ROM_PTR(&pin_PG09) },
+  { MP_ROM_QSTR(MP_QSTR_PG10), MP_ROM_PTR(&pin_PG10) },
+  { MP_ROM_QSTR(MP_QSTR_PG11), MP_ROM_PTR(&pin_PG11) },
+  { MP_ROM_QSTR(MP_QSTR_PG12), MP_ROM_PTR(&pin_PG12) },
+  { MP_ROM_QSTR(MP_QSTR_PG13), MP_ROM_PTR(&pin_PG13) },
+  { MP_ROM_QSTR(MP_QSTR_PG14), MP_ROM_PTR(&pin_PG14) },
+  { MP_ROM_QSTR(MP_QSTR_PG15), MP_ROM_PTR(&pin_PG15) },
+#endif
+  { MP_ROM_QSTR(MP_QSTR_PB03), MP_ROM_PTR(&pin_PB03) },
+  { MP_ROM_QSTR(MP_QSTR_PB04), MP_ROM_PTR(&pin_PB04) },
+  { MP_ROM_QSTR(MP_QSTR_PB05), MP_ROM_PTR(&pin_PB05) },
+  { MP_ROM_QSTR(MP_QSTR_PB06), MP_ROM_PTR(&pin_PB06) },
+  { MP_ROM_QSTR(MP_QSTR_PB07), MP_ROM_PTR(&pin_PB07) },
+  { MP_ROM_QSTR(MP_QSTR_PB08), MP_ROM_PTR(&pin_PB08) },
+  { MP_ROM_QSTR(MP_QSTR_PB09), MP_ROM_PTR(&pin_PB09) },
+#if MCU_PACKAGE >= 100
+  { MP_ROM_QSTR(MP_QSTR_PE00), MP_ROM_PTR(&pin_PE00) },
+  { MP_ROM_QSTR(MP_QSTR_PE01), MP_ROM_PTR(&pin_PE01) },
+#endif
+};
+MP_DEFINE_CONST_DICT(mcu_pin_globals, mcu_pin_globals_table);
diff --git a/ports/stm/common-hal/neopixel_write/__init__.c b/ports/stm/common-hal/neopixel_write/__init__.c
new file mode 100644
index 000000000..6740a0d34
--- /dev/null
+++ b/ports/stm/common-hal/neopixel_write/__init__.c
@@ -0,0 +1,102 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/mphal.h"
+#include "shared-bindings/neopixel_write/__init__.h"
+
+#include "tick.h"
+#include "py/mperrno.h"
+#include "py/runtime.h"
+#include "common-hal/microcontroller/Pin.h"
+#include "stm32f4xx_hal.h"
+#include "stm32f4xx_ll_gpio.h"
+
+uint64_t next_start_tick_ms = 0;
+uint32_t next_start_tick_us = 1000;
+
+//sysclock divisors
+#define MAGIC_800_INT  900000  // ~1.11 us  -> 1.2  field
+#define MAGIC_800_T0H  2800000  // ~0.36 us -> 0.44 field
+#define MAGIC_800_T1H  1350000  // ~0.74 us -> 0.84 field
+
+#pragma GCC push_options
+#pragma GCC optimize ("Os")
+
+void common_hal_neopixel_write (const digitalio_digitalinout_obj_t* digitalinout, uint8_t *pixels, 
+                                uint32_t numBytes) {
+    uint8_t *p = pixels, *end = p + numBytes, pix = *p++, mask = 0x80;
+    uint32_t start = 0;
+    uint32_t cyc = 0;
+
+    //assumes 800_000Hz frequency
+    //Theoretical values here are 800_000 -> 1.25us, 2500000->0.4us, 1250000->0.8us
+    //TODO: try to get dynamic weighting working again
+    uint32_t sys_freq = HAL_RCC_GetSysClockFreq();
+    uint32_t interval = sys_freq/MAGIC_800_INT;
+    uint32_t t0 = (sys_freq/MAGIC_800_T0H);
+    uint32_t t1 = (sys_freq/MAGIC_800_T1H);
+
+    // This must be called while interrupts are on in case we're waiting for a
+    // future ms tick.
+    wait_until(next_start_tick_ms, next_start_tick_us);
+
+    GPIO_TypeDef * p_port = pin_port(digitalinout->pin->port);
+    uint32_t p_mask = pin_mask(digitalinout->pin->number);
+
+    __disable_irq();
+    // Enable DWT in debug core. Useable when interrupts disabled, as opposed to Systick->VAL
+    CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
+    DWT->CTRL |= DWT_CTRL_CYCCNTENA_Msk;
+    DWT->CYCCNT = 0;
+
+    for(;;) {
+        cyc = (pix & mask) ? t1 : t0;
+        start = DWT->CYCCNT;
+        LL_GPIO_SetOutputPin(p_port, p_mask);
+        while((DWT->CYCCNT - start) < cyc);
+        LL_GPIO_ResetOutputPin(p_port, p_mask);
+        while((DWT->CYCCNT - start) < interval);
+        if(!(mask >>= 1)) {
+            if(p >= end) break;
+            pix       = *p++;
+            mask = 0x80;
+        }
+    }
+
+    // Enable interrupts again
+    __enable_irq();
+
+    // Update the next start.
+    current_tick(&next_start_tick_ms, &next_start_tick_us);
+    if (next_start_tick_us < 100) {
+        next_start_tick_ms += 1;
+        next_start_tick_us = 100 - next_start_tick_us;
+    } else {
+        next_start_tick_us -= 100;
+    }
+}
+
+#pragma GCC pop_options
\ No newline at end of file
diff --git a/ports/stm/common-hal/os/__init__.c b/ports/stm/common-hal/os/__init__.c
new file mode 100644
index 000000000..0b3153286
--- /dev/null
+++ b/ports/stm/common-hal/os/__init__.c
@@ -0,0 +1,95 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "genhdr/mpversion.h"
+#include "py/mpconfig.h"
+#include "py/objstr.h"
+#include "py/objtuple.h"
+
+#include "py/mperrno.h"
+#include "py/runtime.h"
+#include "stm32f4xx_hal.h"
+#include "stm32f4/periph.h"
+
+STATIC const qstr os_uname_info_fields[] = {
+    MP_QSTR_sysname, MP_QSTR_nodename,
+    MP_QSTR_release, MP_QSTR_version, MP_QSTR_machine
+};
+STATIC const MP_DEFINE_STR_OBJ(os_uname_info_sysname_obj, "stm32f4");
+STATIC const MP_DEFINE_STR_OBJ(os_uname_info_nodename_obj, "stm32f4");
+
+STATIC const MP_DEFINE_STR_OBJ(os_uname_info_release_obj, MICROPY_VERSION_STRING);
+STATIC const MP_DEFINE_STR_OBJ(os_uname_info_version_obj, MICROPY_GIT_TAG " on " MICROPY_BUILD_DATE);
+STATIC const MP_DEFINE_STR_OBJ(os_uname_info_machine_obj, MICROPY_HW_BOARD_NAME " with " MICROPY_HW_MCU_NAME);
+
+STATIC MP_DEFINE_ATTRTUPLE(
+    os_uname_info_obj,
+    os_uname_info_fields,
+    5,
+    (mp_obj_t)&os_uname_info_sysname_obj,
+    (mp_obj_t)&os_uname_info_nodename_obj,
+    (mp_obj_t)&os_uname_info_release_obj,
+    (mp_obj_t)&os_uname_info_version_obj,
+    (mp_obj_t)&os_uname_info_machine_obj
+);
+
+mp_obj_t common_hal_os_uname(void) {
+    return (mp_obj_t)&os_uname_info_obj;
+}
+
+#define RNG_TIMEOUT 5
+
+bool common_hal_os_urandom(uint8_t *buffer, uint32_t length) {
+    #if (HAS_TRNG)
+    //init the RNG
+    __HAL_RCC_RNG_CLK_ENABLE();
+    RNG_HandleTypeDef handle;
+    handle.Instance = RNG;
+    if (HAL_RNG_Init(&handle) != HAL_OK) mp_raise_ValueError(translate("RNG Init Error"));
+
+    //Assign bytes
+    for (uint i = 0; i < length; i++) {
+        uint32_t temp;
+        uint32_t start = HAL_GetTick();
+        //the HAL function has a timeout, but it isn't long enough, and isn't adjustable
+        while(!(__HAL_RNG_GET_FLAG(&handle,RNG_FLAG_DRDY)) && ((HAL_GetTick() - start) < RNG_TIMEOUT));
+        //
+        if (HAL_RNG_GenerateRandomNumber(&handle, &temp) != HAL_OK) {
+            mp_raise_ValueError(translate("Random number generation error"));
+        }
+        *buffer = (uint8_t)temp;
+    }
+
+    //shut down the peripheral
+    if (HAL_RNG_DeInit(&handle) != HAL_OK) mp_raise_ValueError(translate("RNG DeInit Error"));
+    __HAL_RCC_RNG_CLK_DISABLE();
+
+    return true;
+    #else
+    return false;
+    #endif
+}
\ No newline at end of file
diff --git a/ports/stm/common-hal/pulseio/PWMOut.c b/ports/stm/common-hal/pulseio/PWMOut.c
new file mode 100644
index 000000000..d62ee2a38
--- /dev/null
+++ b/ports/stm/common-hal/pulseio/PWMOut.c
@@ -0,0 +1,448 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ * Uses code from Micropython, Copyright (c) 2013-2016 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdint.h>
+#include "py/runtime.h"
+#include "common-hal/pulseio/PWMOut.h"
+#include "shared-bindings/pulseio/PWMOut.h"
+#include "supervisor/shared/translate.h"
+
+#include "shared-bindings/microcontroller/__init__.h"
+#include "stm32f4xx_hal.h"
+#include "common-hal/microcontroller/Pin.h"
+
+#define ALL_CLOCKS 0xFFFF
+
+STATIC uint8_t reserved_tim[TIM_BANK_ARRAY_LEN];
+STATIC uint32_t tim_frequencies[TIM_BANK_ARRAY_LEN];
+STATIC bool never_reset_tim[TIM_BANK_ARRAY_LEN];
+
+STATIC void tim_clock_enable(uint16_t mask);
+STATIC void tim_clock_disable(uint16_t mask);
+
+// Get the frequency (in Hz) of the source clock for the given timer.
+// On STM32F405/407/415/417 there are 2 cases for how the clock freq is set.
+// If the APB prescaler is 1, then the timer clock is equal to its respective
+// APB clock.  Otherwise (APB prescaler > 1) the timer clock is twice its
+// respective APB clock.  See DM00031020 Rev 4, page 115.
+STATIC uint32_t timer_get_source_freq(uint32_t tim_id) {
+    uint32_t source, clk_div;
+    if (tim_id == 1 || (8 <= tim_id && tim_id <= 11)) {
+        // TIM{1,8,9,10,11} are on APB2
+        source = HAL_RCC_GetPCLK2Freq();
+        clk_div = RCC->CFGR & RCC_CFGR_PPRE2;
+    } else {
+        // TIM{2,3,4,5,6,7,12,13,14} are on APB1
+        source = HAL_RCC_GetPCLK1Freq();
+        clk_div = RCC->CFGR & RCC_CFGR_PPRE1;
+    }
+    if (clk_div != 0) {
+        // APB prescaler for this timer is > 1
+        source *= 2;
+    }
+    return source;
+}
+
+STATIC uint32_t timer_get_internal_duty(uint16_t duty, uint32_t period) {
+    //duty cycle is duty/0xFFFF fraction x (number of pulses per period)
+    return (duty*period) / ((1 << 16) - 1);
+}
+
+STATIC void timer_get_optimal_divisors(uint32_t*period, uint32_t*prescaler,
+                                       uint32_t frequency, uint32_t source_freq) {
+    //Find the largest possible period supported by this frequency
+    for (int i = 0; i < (1 << 16); i++) {
+        *period = source_freq / (i * frequency);
+        if (*period < (1 << 16) && *period >= 2) {
+            *prescaler = i;
+            break;
+        }
+    }
+    if (*prescaler == 0) {
+        mp_raise_ValueError(translate("Invalid frequency supplied"));
+    }
+}
+
+void pwmout_reset(void) {
+    uint16_t never_reset_mask = 0x00;
+    for (int i = 0; i < TIM_BANK_ARRAY_LEN; i++) {
+        if (!never_reset_tim[i]) {
+            reserved_tim[i] = 0x00;
+            tim_frequencies[i] = 0x00;
+        } else {
+            never_reset_mask |= 1 << i;
+        }
+    }
+    tim_clock_disable(ALL_CLOCKS & ~(never_reset_mask));
+}
+
+pwmout_result_t common_hal_pulseio_pwmout_construct(pulseio_pwmout_obj_t* self,
+                                                    const mcu_pin_obj_t* pin,
+                                                    uint16_t duty,
+                                                    uint32_t frequency,
+                                                    bool variable_frequency) {
+    TIM_TypeDef * TIMx;
+    uint8_t tim_num = MP_ARRAY_SIZE(mcu_tim_pin_list);
+    bool tim_chan_taken = false;
+    bool tim_taken_f_mismatch = false;
+    bool var_freq_mismatch = false;
+    bool first_time_setup = true;
+
+    for (uint i = 0; i < tim_num; i++) {
+        const mcu_tim_pin_obj_t * l_tim = &mcu_tim_pin_list[i];
+        uint8_t l_tim_index = l_tim->tim_index - 1;
+        uint8_t l_tim_channel = l_tim->channel_index - 1;
+
+        //if pin is same
+        if (l_tim->pin == pin) {
+            //check if the timer has a channel active
+            if (reserved_tim[l_tim_index] != 0) {
+                //is it the same channel? (or all channels reserved by a var-freq)
+                if (reserved_tim[l_tim_index] & 1 << (l_tim_channel)) {
+                    tim_chan_taken = true;
+                    continue; //keep looking, might be another viable option
+                }
+                //If the frequencies are the same it's ok
+                if (tim_frequencies[l_tim_index] != frequency) {
+                    tim_taken_f_mismatch = true;
+                    continue; //keep looking
+                }
+                //you can't put a variable frequency on a partially reserved timer
+                if (variable_frequency) {
+                    var_freq_mismatch = true;
+                    continue; //keep looking
+                }
+                first_time_setup = false; //skip setting up the timer
+            }
+            //No problems taken, so set it up
+            self->tim = l_tim;
+            break;
+        }
+    }
+
+    //handle valid/invalid timer instance
+    if (self->tim != NULL) {
+        //create instance
+        TIMx = mcu_tim_banks[self->tim->tim_index - 1];
+        //reserve timer/channel
+        if (variable_frequency) {
+            reserved_tim[self->tim->tim_index - 1] = 0x0F;
+        } else {
+            reserved_tim[self->tim->tim_index - 1] |= 1 << (self->tim->channel_index - 1);
+        }
+        tim_frequencies[self->tim->tim_index - 1] = frequency;
+    } else { //no match found
+        if (tim_chan_taken) {
+            mp_raise_ValueError(translate("No more timers available on this pin."));
+        } else if (tim_taken_f_mismatch) {
+            mp_raise_ValueError(translate("Frequency must match existing PWMOut using this timer"));
+        } else if (var_freq_mismatch) {
+            mp_raise_ValueError(translate("Cannot vary frequency on a timer that is already in use"));
+        } else {
+            mp_raise_ValueError(translate("Invalid pins for PWMOut"));
+        }
+    }
+
+    GPIO_InitTypeDef GPIO_InitStruct = {0};
+    GPIO_InitStruct.Pin = pin_mask(pin->number);
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
+    GPIO_InitStruct.Alternate = self->tim->altfn_index;
+    HAL_GPIO_Init(pin_port(pin->port), &GPIO_InitStruct);
+
+    tim_clock_enable(1 << (self->tim->tim_index - 1));
+
+    //translate channel into handle value
+    self->channel = 4 * (self->tim->channel_index - 1);
+
+    uint32_t prescaler = 0; //prescaler is 15 bit
+    uint32_t period = 0; //period is 16 bit
+    timer_get_optimal_divisors(&period, &prescaler, frequency,
+                            timer_get_source_freq(self->tim->tim_index));
+
+    //Timer init
+    self->handle.Instance = TIMx;
+    self->handle.Init.Period = period - 1;
+    self->handle.Init.Prescaler = prescaler - 1;
+    self->handle.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
+    self->handle.Init.CounterMode = TIM_COUNTERMODE_UP;
+    self->handle.Init.RepetitionCounter = 0;
+
+    //only run init if this is the first instance of this timer
+    if (first_time_setup) {
+        if (HAL_TIM_PWM_Init(&self->handle) != HAL_OK) {
+            mp_raise_ValueError(translate("Could not initialize timer"));
+        }
+    }
+
+    //Channel/PWM init
+    self->chan_handle.OCMode = TIM_OCMODE_PWM1;
+    self->chan_handle.Pulse = timer_get_internal_duty(duty, period);
+    self->chan_handle.OCPolarity = TIM_OCPOLARITY_HIGH;
+    self->chan_handle.OCFastMode = TIM_OCFAST_DISABLE;
+    if (HAL_TIM_PWM_ConfigChannel(&self->handle, &self->chan_handle, self->channel) != HAL_OK) {
+        mp_raise_ValueError(translate("Could not initialize channel"));
+    }
+    if (HAL_TIM_PWM_Start(&self->handle, self->channel) != HAL_OK) {
+        mp_raise_ValueError(translate("Could not start PWM"));
+    }
+
+    self->variable_frequency = variable_frequency;
+    self->frequency = frequency;
+    self->duty_cycle = duty;
+    self->period = period;
+
+    return PWMOUT_OK;
+}
+
+void common_hal_pulseio_pwmout_never_reset(pulseio_pwmout_obj_t *self) {
+    for (size_t i = 0; i < TIM_BANK_ARRAY_LEN; i++) {
+        if (mcu_tim_banks[i] == self->handle.Instance) {
+            never_reset_tim[i] = true;
+            never_reset_pin_number(self->tim->pin->port, self->tim->pin->number);
+            break;
+        }
+    }
+}
+
+void common_hal_pulseio_pwmout_reset_ok(pulseio_pwmout_obj_t *self) {
+    for(size_t i = 0; i < TIM_BANK_ARRAY_LEN; i++) {
+        if (mcu_tim_banks[i] == self->handle.Instance) {
+            never_reset_tim[i] = false;
+            break;
+        }
+    }
+}
+
+bool common_hal_pulseio_pwmout_deinited(pulseio_pwmout_obj_t* self) {
+    return self->tim == NULL;
+}
+
+void common_hal_pulseio_pwmout_deinit(pulseio_pwmout_obj_t* self) {
+    if (common_hal_pulseio_pwmout_deinited(self)) {
+        return;
+    }
+    //var freq shuts down entire timer, others just their channel
+    if (self->variable_frequency) {
+        reserved_tim[self->tim->tim_index - 1] = 0x00;
+    } else {
+        reserved_tim[self->tim->tim_index - 1] &= ~(1 << self->tim->channel_index);
+        HAL_TIM_PWM_Stop(&self->handle, self->channel);
+    }
+    reset_pin_number(self->tim->pin->port,self->tim->pin->number);
+    self->tim = NULL;
+
+    //if reserved timer has no active channels, we can disable it
+    if (!reserved_tim[self->tim->tim_index - 1]) {
+        tim_frequencies[self->tim->tim_index - 1] = 0x00;
+        tim_clock_disable(1 << (self->tim->tim_index - 1));
+    }
+}
+
+void common_hal_pulseio_pwmout_set_duty_cycle(pulseio_pwmout_obj_t* self, uint16_t duty) {
+    uint32_t internal_duty_cycle = timer_get_internal_duty(duty, self->period);
+    __HAL_TIM_SET_COMPARE(&self->handle, self->channel, internal_duty_cycle);
+    self->duty_cycle = duty;
+}
+
+uint16_t common_hal_pulseio_pwmout_get_duty_cycle(pulseio_pwmout_obj_t* self) {
+    return self->duty_cycle;
+}
+
+void common_hal_pulseio_pwmout_set_frequency(pulseio_pwmout_obj_t* self, uint32_t frequency) {
+    //don't halt setup for the same frequency
+    if (frequency == self->frequency) {
+        return;
+    }
+
+    uint32_t prescaler = 0;
+    uint32_t period = 0;
+    timer_get_optimal_divisors(&period, &prescaler, frequency,
+                                timer_get_source_freq(self->tim->tim_index));
+
+    //shut down
+    HAL_TIM_PWM_Stop(&self->handle, self->channel);
+
+    //Only change altered values
+    self->handle.Init.Period = period - 1;
+    self->handle.Init.Prescaler = prescaler - 1;
+
+    //restart everything, adjusting for new speed
+    if (HAL_TIM_PWM_Init(&self->handle) != HAL_OK) {
+        mp_raise_ValueError(translate("Could not re-init timer"));
+    }
+
+    self->chan_handle.Pulse = timer_get_internal_duty(self->duty_cycle, period);
+
+    if (HAL_TIM_PWM_ConfigChannel(&self->handle, &self->chan_handle, self->channel) != HAL_OK) {
+        mp_raise_ValueError(translate("Could not re-init channel"));
+    }
+    if (HAL_TIM_PWM_Start(&self->handle, self->channel) != HAL_OK) {
+        mp_raise_ValueError(translate("Could not restart PWM"));
+    }
+
+    tim_frequencies[self->tim->tim_index - 1] = frequency;
+    self->frequency = frequency;
+    self->period = period;
+}
+
+uint32_t common_hal_pulseio_pwmout_get_frequency(pulseio_pwmout_obj_t* self) {
+    return self->frequency;
+}
+
+bool common_hal_pulseio_pwmout_get_variable_frequency(pulseio_pwmout_obj_t* self) {
+    return self->variable_frequency;
+}
+
+STATIC void tim_clock_enable(uint16_t mask) {
+    #ifdef TIM1
+    if (mask & (1 << 0)) {
+        __HAL_RCC_TIM1_CLK_ENABLE();
+    }
+    #endif
+    #ifdef TIM2
+    if (mask & (1 << 1)) {
+        __HAL_RCC_TIM2_CLK_ENABLE();
+    }
+    #endif
+    #ifdef TIM3
+    if (mask & (1 << 2)) {
+        __HAL_RCC_TIM3_CLK_ENABLE();
+    }
+    #endif
+    #ifdef TIM4
+    if (mask & (1 << 3)) {
+        __HAL_RCC_TIM4_CLK_ENABLE();
+    }
+    #endif
+    #ifdef TIM5
+    if (mask & (1 << 4)) {
+        __HAL_RCC_TIM5_CLK_ENABLE();
+    }
+    #endif
+    //6 and 7 are reserved ADC timers
+    #ifdef TIM8
+    if (mask & (1 << 7)) {
+        __HAL_RCC_TIM8_CLK_ENABLE();
+    }
+    #endif
+    #ifdef TIM9
+    if (mask & (1 << 8)) {
+        __HAL_RCC_TIM9_CLK_ENABLE();
+    }
+    #endif
+    #ifdef TIM10
+    if (mask & (1 << 9)) {
+        __HAL_RCC_TIM10_CLK_ENABLE();
+    }
+    #endif
+    #ifdef TIM11
+    if (mask & (1 << 10)) {
+        __HAL_RCC_TIM11_CLK_ENABLE();
+    }
+    #endif
+    #ifdef TIM12
+    if (mask & (1 << 11)) {
+        __HAL_RCC_TIM12_CLK_ENABLE();
+    }
+    #endif
+    #ifdef TIM13
+    if (mask & (1 << 12)) {
+        __HAL_RCC_TIM13_CLK_ENABLE();
+    }
+    #endif
+    #ifdef TIM14
+    if (mask & (1 << 13)) {
+        __HAL_RCC_TIM14_CLK_ENABLE();
+    }
+    #endif
+}
+
+STATIC void tim_clock_disable(uint16_t mask) {
+    #ifdef TIM1
+    if (mask & (1 << 0)) {
+        __HAL_RCC_TIM1_CLK_DISABLE();
+    }
+    #endif
+    #ifdef TIM2
+    if (mask & (1 << 1)) {
+        __HAL_RCC_TIM2_CLK_DISABLE();
+    }
+    #endif
+    #ifdef TIM3
+    if (mask & (1 << 2)) {
+        __HAL_RCC_TIM3_CLK_DISABLE();
+    }
+    #endif
+    #ifdef TIM4
+    if (mask & (1 << 3)) {
+        __HAL_RCC_TIM4_CLK_DISABLE();
+    }
+    #endif
+    #ifdef TIM5
+    if (mask & (1 << 4)) {
+        __HAL_RCC_TIM5_CLK_DISABLE();
+    }
+    #endif
+    //6 and 7 are reserved ADC timers
+    #ifdef TIM8
+    if (mask & (1 << 7)) {
+        __HAL_RCC_TIM8_CLK_DISABLE();
+    }
+    #endif
+    #ifdef TIM9
+    if (mask & (1 << 8)) {
+        __HAL_RCC_TIM9_CLK_DISABLE();
+    }
+    #endif
+    #ifdef TIM10
+    if (mask & (1 << 9)) {
+        __HAL_RCC_TIM10_CLK_DISABLE();
+    }
+    #endif
+    #ifdef TIM11
+    if (mask & (1 << 10)) {
+        __HAL_RCC_TIM11_CLK_DISABLE();
+    }
+    #endif
+    #ifdef TIM12
+    if (mask & (1 << 11)) {
+        __HAL_RCC_TIM12_CLK_DISABLE();
+    }
+    #endif
+    #ifdef TIM13
+    if (mask & (1 << 12)) {
+        __HAL_RCC_TIM13_CLK_DISABLE();
+    }
+    #endif
+    #ifdef TIM14
+    if (mask & (1 << 13)) {
+        __HAL_RCC_TIM14_CLK_DISABLE();
+    }
+    #endif
+}
diff --git a/ports/stm/common-hal/pulseio/PWMOut.h b/ports/stm/common-hal/pulseio/PWMOut.h
new file mode 100644
index 000000000..59fc04e5f
--- /dev/null
+++ b/ports/stm/common-hal/pulseio/PWMOut.h
@@ -0,0 +1,51 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_COMMON_HAL_PULSEIO_PWMOUT_H
+#define MICROPY_INCLUDED_STM32F4_COMMON_HAL_PULSEIO_PWMOUT_H
+
+#include "common-hal/microcontroller/Pin.h"
+
+#include "stm32f4xx_hal.h"
+#include "stm32f4/periph.h"
+
+#include "py/obj.h"
+
+typedef struct {
+    mp_obj_base_t base;
+    TIM_HandleTypeDef handle;
+    TIM_OC_InitTypeDef chan_handle;
+    const mcu_tim_pin_obj_t *tim;
+    uint8_t channel: 7;
+    bool variable_frequency: 1;
+    uint16_t duty_cycle;
+    uint32_t frequency;
+    uint32_t period;
+} pulseio_pwmout_obj_t;
+
+void pwmout_reset(void);
+
+#endif // MICROPY_INCLUDED_STM32F4_COMMON_HAL_PULSEIO_PWMOUT_H
diff --git a/ports/stm/common-hal/pulseio/PulseIn.c b/ports/stm/common-hal/pulseio/PulseIn.c
new file mode 100644
index 000000000..068936bdd
--- /dev/null
+++ b/ports/stm/common-hal/pulseio/PulseIn.c
@@ -0,0 +1,79 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "common-hal/pulseio/PulseIn.h"
+#include <stdint.h>
+#include <string.h>
+#include "py/mpconfig.h"
+#include "py/gc.h"
+#include "py/runtime.h"
+#include "shared-bindings/microcontroller/__init__.h"
+#include "shared-bindings/pulseio/PulseIn.h"
+#include "tick.h"
+
+void pulsein_reset(void) {
+}
+
+void common_hal_pulseio_pulsein_construct(pulseio_pulsein_obj_t* self, const mcu_pin_obj_t* pin,
+                                             uint16_t maxlen, bool idle_state) {
+    mp_raise_NotImplementedError(translate("PulseIn not yet supported"));
+}
+
+bool common_hal_pulseio_pulsein_deinited(pulseio_pulsein_obj_t* self) {
+  return true;
+}
+
+void common_hal_pulseio_pulsein_deinit(pulseio_pulsein_obj_t* self) {
+}
+
+void common_hal_pulseio_pulsein_pause(pulseio_pulsein_obj_t* self) {
+}
+
+void common_hal_pulseio_pulsein_resume(pulseio_pulsein_obj_t* self, uint16_t trigger_duration) {
+}
+
+void common_hal_pulseio_pulsein_clear(pulseio_pulsein_obj_t* self) {
+}
+
+uint16_t common_hal_pulseio_pulsein_get_item(pulseio_pulsein_obj_t* self, int16_t index) {
+    return 0;
+}
+
+uint16_t common_hal_pulseio_pulsein_popleft(pulseio_pulsein_obj_t* self) {
+    return 0;
+}
+
+uint16_t common_hal_pulseio_pulsein_get_maxlen(pulseio_pulsein_obj_t* self) {
+    return 0;
+}
+
+bool common_hal_pulseio_pulsein_get_paused(pulseio_pulsein_obj_t* self) {
+    return 0;
+}
+
+uint16_t common_hal_pulseio_pulsein_get_len(pulseio_pulsein_obj_t* self) {
+    return 0;
+}
diff --git a/ports/stm/common-hal/pulseio/PulseIn.h b/ports/stm/common-hal/pulseio/PulseIn.h
new file mode 100644
index 000000000..2538b07ab
--- /dev/null
+++ b/ports/stm/common-hal/pulseio/PulseIn.h
@@ -0,0 +1,53 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_COMMON_HAL_PULSEIO_PULSEIN_H
+#define MICROPY_INCLUDED_STM32F4_COMMON_HAL_PULSEIO_PULSEIN_H
+
+#include "common-hal/microcontroller/Pin.h"
+
+#include "py/obj.h"
+
+typedef struct {
+    mp_obj_base_t base;
+
+    uint8_t pin;
+    bool idle_state;
+    bool paused;
+    volatile bool first_edge;
+
+    uint16_t* buffer;
+    uint16_t maxlen;
+
+    volatile uint16_t start;
+    volatile uint16_t len;
+    volatile uint16_t last_us;
+    volatile uint64_t last_ms;
+} pulseio_pulsein_obj_t;
+
+void pulsein_reset(void);
+
+#endif // MICROPY_INCLUDED_STM32F4_COMMON_HAL_PULSEIO_PULSEIN_H
diff --git a/ports/stm/common-hal/pulseio/PulseOut.c b/ports/stm/common-hal/pulseio/PulseOut.c
new file mode 100644
index 000000000..d82525ea1
--- /dev/null
+++ b/ports/stm/common-hal/pulseio/PulseOut.c
@@ -0,0 +1,214 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "common-hal/pulseio/PulseOut.h"
+
+#include <stdint.h>
+
+#include "py/mpconfig.h"
+#include "py/gc.h"
+#include "py/runtime.h"
+#include "shared-bindings/pulseio/PulseOut.h"
+#include "shared-bindings/pulseio/PWMOut.h"
+#include "supervisor/shared/translate.h"
+
+#include "stm32f4xx_hal.h"
+#include "common-hal/microcontroller/Pin.h"
+#include "tick.h"
+
+// A single timer is shared amongst all PulseOut objects under the assumption that
+// the code is single threaded.
+STATIC uint8_t refcount = 0;
+
+STATIC uint16_t *pulse_array = NULL;
+STATIC volatile uint16_t pulse_array_index = 0;
+STATIC uint16_t pulse_array_length;
+
+//Timer is shared, must be accessible by interrupt
+STATIC TIM_HandleTypeDef t7_handle;
+pulseio_pulseout_obj_t *curr_pulseout = NULL;
+
+STATIC void turn_on(pulseio_pulseout_obj_t *pulseout) {
+    // Turn on PWM
+    HAL_TIM_PWM_Start(&(pulseout->pwmout->handle), pulseout->pwmout->channel);
+}
+
+STATIC void turn_off(pulseio_pulseout_obj_t *pulseout) {
+    // Turn off PWM
+    HAL_TIM_PWM_Stop(&(pulseout->pwmout->handle), pulseout->pwmout->channel);
+    // Make sure pin is low.
+    HAL_GPIO_WritePin(pin_port(pulseout->pwmout->tim->pin->port), 
+                      pin_mask(pulseout->pwmout->tim->pin->number), 0);
+}
+
+STATIC void start_timer(void) {
+    // Set the new period
+    t7_handle.Init.Period = pulse_array[pulse_array_index] - 1;
+    HAL_TIM_Base_Init(&t7_handle);
+
+    // TIM7 has limited HAL support, set registers manually
+    t7_handle.Instance->SR = 0; // Prevent the SR from triggering an interrupt
+    t7_handle.Instance->CR1 |= TIM_CR1_CEN; // Resume timer
+    t7_handle.Instance->CR1 |= TIM_CR1_URS; // Disable non-overflow interrupts
+    __HAL_TIM_ENABLE_IT(&t7_handle, TIM_IT_UPDATE);
+
+}
+
+STATIC void pulseout_event_handler(void) {
+    if (curr_pulseout->pwmout == NULL) {
+        return; //invalid interrupt
+    }
+
+    HAL_GPIO_WritePin(pin_port(2),pin_mask(6), 1);
+    HAL_GPIO_WritePin(pin_port(2),pin_mask(6), 0);
+
+    pulse_array_index++;
+
+    // No more pulses. Turn off output and don't restart.
+    if (pulse_array_index >= pulse_array_length) {
+        turn_off(curr_pulseout);
+        return;
+    }
+
+    // Alternate on and off, starting with on.
+    if (pulse_array_index % 2 == 0) {
+        turn_on(curr_pulseout);
+    } else {
+        turn_off(curr_pulseout);
+    }
+
+    // Count up to the next given value.
+    start_timer();
+}
+
+void pulseout_reset() {
+    #if HAS_BASIC_TIM
+    __HAL_RCC_TIM7_CLK_DISABLE();
+    refcount = 0;
+    #endif
+}
+
+void common_hal_pulseio_pulseout_construct(pulseio_pulseout_obj_t* self,
+                                           const pulseio_pwmout_obj_t* carrier) {
+#if !(HAS_BASIC_TIM)
+    mp_raise_NotImplementedError(translate("PulseOut not supported on this chip"));
+#else
+    // Add to active PulseOuts
+    refcount++;
+
+    // Calculate a 1 ms period
+    uint32_t source, clk_div;
+    source = HAL_RCC_GetPCLK1Freq(); // TIM7 is on APB1
+    clk_div = RCC->CFGR & RCC_CFGR_PPRE1;
+    // APB quirk, see See DM00031020 Rev 4, page 115.
+    if (clk_div != 0) {
+        // APB prescaler for this timer is > 1
+        source *= 2;
+    }
+
+    uint32_t prescaler = source/1000000; //1us intervals
+
+    __HAL_RCC_TIM7_CLK_ENABLE();
+    HAL_NVIC_SetPriority(TIM7_IRQn, 4, 0);
+    HAL_NVIC_EnableIRQ(TIM7_IRQn);
+
+    // Timers 6 and 7 have no pins, so using them doesn't affect PWM availability
+    t7_handle.Instance = TIM7;
+    t7_handle.Init.Period = 100; //immediately replaced.
+    t7_handle.Init.Prescaler = prescaler - 1;
+    t7_handle.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
+    t7_handle.Init.CounterMode = TIM_COUNTERMODE_UP;
+    t7_handle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
+
+    HAL_TIM_Base_Init(&t7_handle);
+    t7_handle.Instance->SR = 0;
+
+    // The HAL can't work with const, recast required.
+    self->pwmout = (pulseio_pwmout_obj_t*)carrier;
+
+    turn_off(self);
+#endif
+}
+
+bool common_hal_pulseio_pulseout_deinited(pulseio_pulseout_obj_t* self) {
+    return self->pwmout == NULL;
+}
+
+void common_hal_pulseio_pulseout_deinit(pulseio_pulseout_obj_t* self) {
+    if (common_hal_pulseio_pulseout_deinited(self)) {
+        return;
+    }
+    turn_on(self);
+    self->pwmout = NULL;
+
+    refcount--;
+    if (refcount == 0) {
+        #if HAS_BASIC_TIM
+        __HAL_RCC_TIM7_CLK_DISABLE();
+        #endif
+    }
+}
+
+void common_hal_pulseio_pulseout_send(pulseio_pulseout_obj_t* self, uint16_t* pulses, uint16_t length) {
+    pulse_array = pulses;
+    pulse_array_index = 0;
+    pulse_array_length = length;
+    curr_pulseout = self;
+
+    turn_on(self);
+
+    // Count up to the next given value.
+    start_timer();
+
+    // Use when debugging, or issues are irrecoverable
+    // uint32_t starttime = supervisor_ticks_ms64();
+    // uint32_t timeout = 10000;
+    while(pulse_array_index < length) {
+        // Do other things while we wait. The interrupts will handle sending the
+        // signal.
+        RUN_BACKGROUND_TASKS;
+
+        // Use when debugging, or issues are irrecoverable
+        // if ((supervisor_ticks_ms64() - starttime ) > timeout ) {
+        //    mp_raise_RuntimeError(translate("Error: Send Timeout"));
+        // }
+    }
+    //turn off timer counter. 
+    t7_handle.Instance->CR1 &= ~TIM_CR1_CEN;
+}
+
+void TIM7_IRQHandler(void)
+{
+    // Detect TIM Update event
+    if (__HAL_TIM_GET_FLAG(&t7_handle, TIM_FLAG_UPDATE) != RESET)
+    {
+        if (__HAL_TIM_GET_IT_SOURCE(&t7_handle, TIM_IT_UPDATE) != RESET)
+        {
+            __HAL_TIM_CLEAR_IT(&t7_handle, TIM_IT_UPDATE);
+            pulseout_event_handler();
+        }
+    }
+}
diff --git a/ports/stm/common-hal/pulseio/PulseOut.h b/ports/stm/common-hal/pulseio/PulseOut.h
new file mode 100644
index 000000000..aa97396d0
--- /dev/null
+++ b/ports/stm/common-hal/pulseio/PulseOut.h
@@ -0,0 +1,42 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_COMMON_HAL_PULSEIO_PULSEOUT_H
+#define MICROPY_INCLUDED_STM32F4_COMMON_HAL_PULSEIO_PULSEOUT_H
+
+#include "common-hal/microcontroller/Pin.h"
+#include "common-hal/pulseio/PWMOut.h"
+
+#include "py/obj.h"
+
+typedef struct {
+    mp_obj_base_t base;
+    pulseio_pwmout_obj_t *pwmout;
+} pulseio_pulseout_obj_t;
+
+void pulseout_reset(void);
+
+#endif // MICROPY_INCLUDED_STM32F4_COMMON_HAL_PULSEIO_PULSEOUT_H
diff --git a/ports/stm/common-hal/pulseio/__init__.c b/ports/stm/common-hal/pulseio/__init__.c
new file mode 100644
index 000000000..2bee925bc
--- /dev/null
+++ b/ports/stm/common-hal/pulseio/__init__.c
@@ -0,0 +1 @@
+// No pulseio module functions.
diff --git a/ports/stm/common-hal/supervisor/Runtime.c b/ports/stm/common-hal/supervisor/Runtime.c
new file mode 100755
index 000000000..feab6987d
--- /dev/null
+++ b/ports/stm/common-hal/supervisor/Runtime.c
@@ -0,0 +1,38 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Michael Schroeder
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdbool.h>
+#include "shared-bindings/supervisor/Runtime.h"
+#include "supervisor/serial.h"
+
+bool common_hal_get_serial_connected(void) {
+    return (bool) serial_connected();
+}
+
+bool common_hal_get_serial_bytes_available(void) {
+  return (bool) serial_bytes_available();
+}
+
diff --git a/ports/stm/common-hal/supervisor/Runtime.h b/ports/stm/common-hal/supervisor/Runtime.h
new file mode 100755
index 000000000..9a798e056
--- /dev/null
+++ b/ports/stm/common-hal/supervisor/Runtime.h
@@ -0,0 +1,37 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Michael Schroeder
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_COMMON_HAL_SUPERVISOR_RUNTIME_H
+#define MICROPY_INCLUDED_STM32F4_COMMON_HAL_SUPERVISOR_RUNTIME_H
+
+#include "py/obj.h"
+
+typedef struct {
+    mp_obj_base_t base;
+    // Stores no state currently.
+} super_runtime_obj_t;
+
+#endif // MICROPY_INCLUDED_STM32F4_COMMON_HAL_SUPERVISOR_RUNTIME_H
diff --git a/ports/stm/common-hal/supervisor/__init__.c b/ports/stm/common-hal/supervisor/__init__.c
new file mode 100755
index 000000000..ac88556b4
--- /dev/null
+++ b/ports/stm/common-hal/supervisor/__init__.c
@@ -0,0 +1,40 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Michael Schroeder
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+
+#include "py/obj.h"
+
+#include "shared-bindings/supervisor/__init__.h"
+#include "shared-bindings/supervisor/Runtime.h"
+
+
+// The singleton supervisor.Runtime object, bound to supervisor.runtime
+// It currently only has properties, and no state.
+const super_runtime_obj_t common_hal_supervisor_runtime_obj = {
+    .base = {
+        .type = &supervisor_runtime_type,
+    },
+};
\ No newline at end of file
diff --git a/ports/stm/common-hal/time/__init__.c b/ports/stm/common-hal/time/__init__.c
new file mode 100644
index 000000000..c85077868
--- /dev/null
+++ b/ports/stm/common-hal/time/__init__.c
@@ -0,0 +1,45 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/mphal.h"
+
+#include "tick.h"
+
+uint64_t common_hal_time_monotonic(void) {
+    return supervisor_ticks_ms64();
+}
+
+uint64_t common_hal_time_monotonic_ns(void) {
+    uint64_t ms;
+    uint32_t us_until_ms;
+    current_tick(&ms, &us_until_ms);
+    // us counts down.
+    return 1000 * (ms * 1000 + (1000 - us_until_ms));
+}
+
+void common_hal_time_delay_ms(uint32_t delay) {
+    mp_hal_delay_ms(delay);
+}
diff --git a/ports/stm/fatfs_port.c b/ports/stm/fatfs_port.c
new file mode 100644
index 000000000..13ac21fb1
--- /dev/null
+++ b/ports/stm/fatfs_port.c
@@ -0,0 +1,33 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013, 2014 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/runtime.h"
+#include "lib/oofatfs/ff.h"
+
+DWORD get_fattime(void) {
+	// TODO: Implement this function. For now, fake it.
+    return ((2016 - 1980) << 25) | ((12) << 21) | ((4) << 16) | ((00) << 11) | ((18) << 5) | (23 / 2);
+}
diff --git a/ports/stm/mpconfigport.h b/ports/stm/mpconfigport.h
new file mode 100644
index 000000000..283984ea9
--- /dev/null
+++ b/ports/stm/mpconfigport.h
@@ -0,0 +1,59 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 Glenn Ruben Bakke
+ * Copyright (c) 2019 Dan Halbert for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef STM32F4_MPCONFIGPORT_H__
+#define STM32F4_MPCONFIGPORT_H__
+
+#define MICROPY_PY_COLLECTIONS_ORDEREDDICT       (1)
+#define MICROPY_PY_FUNCTION_ATTRS                (1)
+#define MICROPY_PY_IO                            (1)
+#define MICROPY_PY_REVERSE_SPECIAL_METHODS       (1)
+#define MICROPY_PY_UJSON                         (1)
+
+// 24kiB stack
+#define CIRCUITPY_DEFAULT_STACK_SIZE            0x6000
+
+#include "py/circuitpy_mpconfig.h"
+
+//Board flags:
+#ifndef BOARD_OVERWRITE_SWD
+#define BOARD_OVERWRITE_SWD (0)
+#endif
+#ifndef BOARD_VTOR_DEFER
+#define BOARD_VTOR_DEFER (0)
+#endif
+#ifndef BOARD_NO_VBUS_SENSE
+#define BOARD_NO_VBUS_SENSE (0)
+#endif
+
+#define MAX_UART 10 //how many UART are implemented
+
+#define MICROPY_PORT_ROOT_POINTERS \
+    void *cpy_uart_obj_all[MAX_UART]; \
+	CIRCUITPY_COMMON_ROOT_POINTERS
+
+#endif  // __INCLUDED_MPCONFIGPORT_H
diff --git a/ports/stm/mpconfigport.mk b/ports/stm/mpconfigport.mk
new file mode 100644
index 000000000..493f32c63
--- /dev/null
+++ b/ports/stm/mpconfigport.mk
@@ -0,0 +1,77 @@
+# Define an equivalent for MICROPY_LONGINT_IMPL, to pass to $(MPY-TOOL) in py/mkrules.mk
+# $(MPY-TOOL) needs to know what kind of longint to use (if any) to freeze long integers.
+# This should correspond to the MICROPY_LONGINT_IMPL definition in mpconfigport.h.
+MPY_TOOL_LONGINT_IMPL = -mlongint-impl=mpz
+
+# Internal math library is substantially smaller than toolchain one
+INTERNAL_LIBM = 1
+
+# Chip supplied serial number, in bytes
+USB_SERIAL_NUMBER_LENGTH = 24
+
+# Longints can be implemented as mpz, as longlong, or not
+LONGINT_IMPL = MPZ
+
+#Reduced feature set for early port
+CIRCUITPY_MINIMAL_BUILD = 1
+
+# The ifndef's allow overriding in mpconfigboard.mk.
+
+ifndef CIRCUITPY_BOARD
+CIRCUITPY_BOARD = 1
+endif
+
+ifndef CIRCUITPY_DIGITALIO
+CIRCUITPY_DIGITALIO = 1
+endif
+
+ifndef CIRCUITPY_ANALOGIO
+CIRCUITPY_ANALOGIO = 1
+endif
+
+ifndef CIRCUITPY_MICROCONTROLLER
+CIRCUITPY_MICROCONTROLLER = 1
+endif
+
+ifndef CIRCUITPY_BUSIO
+CIRCUITPY_BUSIO = 1
+endif
+
+ifndef CIRCUITPY_PULSEIO
+CIRCUITPY_PULSEIO = 1
+endif
+
+ifndef CIRCUITPY_OS
+CIRCUITPY_OS = 1
+endif
+
+ifndef CIRCUITPY_STORAGE
+CIRCUITPY_STORAGE = 1
+endif
+
+ifndef CIRCUITPY_RANDOM
+CIRCUITPY_RANDOM = 1
+endif
+
+ifndef CRICUITPY_USB_HID
+CIRCUITPY_USB_HID = 1
+endif
+
+ifndef CIRCUITPY_USB_MIDI
+CIRCUITPY_USB_MIDI = 1
+endif
+
+ifndef CIRCUITPY_NEOPIXEL_WRITE
+CIRCUITPY_NEOPIXEL_WRITE = 1
+endif
+
+ifndef CIRCUITPY_DISPLAYIO
+CIRCUITPY_DISPLAYIO = 1
+endif
+
+CFLAGS += -DMICROPY_CPYTHON_COMPAT=1
+
+MICROPY_PY_ULAB = 1
+
+#ifeq ($(MCU_SUB_VARIANT), stm32f412zx)
+#endif
diff --git a/ports/stm/mphalport.c b/ports/stm/mphalport.c
new file mode 100644
index 000000000..a3cf501c0
--- /dev/null
+++ b/ports/stm/mphalport.c
@@ -0,0 +1,63 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 Glenn Ruben Bakke
+ * Copyright (c) 2018 Artur Pacholec
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <string.h>
+
+#include "py/mphal.h"
+#include "py/mpstate.h"
+#include "py/gc.h"
+
+#include "shared-bindings/microcontroller/__init__.h"
+#include "supervisor/shared/tick.h"
+#include "stm32f4xx_hal.h"
+
+void mp_hal_delay_ms(mp_uint_t delay) {
+    uint64_t start_tick = supervisor_ticks_ms64();
+    uint64_t duration = 0;
+    while (duration < delay) {
+        RUN_BACKGROUND_TASKS;
+        // Check to see if we've been CTRL-Ced by autoreload or the user.
+        if(MP_STATE_VM(mp_pending_exception) == MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_kbd_exception)) ||
+           MP_STATE_VM(mp_pending_exception) == MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_reload_exception))) {
+            break;
+        }
+        duration = (supervisor_ticks_ms64() - start_tick);
+        // TODO(tannewt): Go to sleep for a little while while we wait.
+    }
+}
+
+void mp_hal_delay_us(mp_uint_t delay) {
+    common_hal_mcu_delay_us(delay);
+}
+
+void mp_hal_disable_all_interrupts(void) {
+    common_hal_mcu_disable_interrupts();
+}
+
+void mp_hal_enable_all_interrupts(void) {
+    common_hal_mcu_enable_interrupts();
+}
diff --git a/ports/stm/mphalport.h b/ports/stm/mphalport.h
new file mode 100644
index 000000000..b392cb0f8
--- /dev/null
+++ b/ports/stm/mphalport.h
@@ -0,0 +1,51 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 Glenn Ruben Bakke
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_MPHALPORT_H
+#define MICROPY_INCLUDED_STM32F4_MPHALPORT_H
+
+#include "py/obj.h"
+
+#include "lib/oofatfs/ff.h"
+
+#include "supervisor/shared/tick.h"
+
+// Global millisecond tick count (driven by SysTick interrupt).
+static inline mp_uint_t mp_hal_ticks_ms(void) {
+  return supervisor_ticks_ms32();
+}
+// Number of bytes in receive buffer
+volatile uint8_t usb_rx_count;
+volatile bool mp_cdc_enabled;
+
+int receive_usb(void);
+
+void mp_hal_set_interrupt_char(int c);
+
+void mp_hal_disable_all_interrupts(void);
+void mp_hal_enable_all_interrupts(void);
+
+#endif // MICROPY_INCLUDED_STM32F4_MPHALPORT_H
diff --git a/ports/stm/peripherals/stm32f4/clocks.h b/ports/stm/peripherals/stm32f4/clocks.h
new file mode 100644
index 000000000..c7ba84662
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/clocks.h
@@ -0,0 +1,27 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+void stm32f4_peripherals_clocks_init(void);
diff --git a/ports/stm/peripherals/stm32f4/gpio.h b/ports/stm/peripherals/stm32f4/gpio.h
new file mode 100644
index 000000000..34f89e792
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/gpio.h
@@ -0,0 +1,28 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+void stm32f4_peripherals_gpio_init(void);
+void stm32f4_peripherals_status_led(uint8_t led, uint8_t state);
diff --git a/ports/stm/peripherals/stm32f4/periph.h b/ports/stm/peripherals/stm32f4/periph.h
new file mode 100644
index 000000000..d311afe4a
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/periph.h
@@ -0,0 +1,180 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef __MICROPY_INCLUDED_STM32F4_PERIPHERALS_PERIPH_H__
+#define __MICROPY_INCLUDED_STM32F4_PERIPHERALS_PERIPH_H__
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "stm32f4xx_hal.h"
+#include "stm32f4/pins.h"
+
+// I2C 
+// TODO: these objects should be condensed into a single 'periph_pin' unless we
+// find a compelling reason to store more unique data in them. 
+
+typedef struct {
+    uint8_t i2c_index:4; // Index of the I2C unit (1 to 3)
+    uint8_t altfn_index:4; //Index of the altfn for this pin (0 to 15)
+    const mcu_pin_obj_t * pin;
+} mcu_i2c_sda_obj_t;
+
+typedef struct {
+    uint8_t i2c_index:4; 
+    uint8_t altfn_index:4; 
+    const mcu_pin_obj_t * pin;
+} mcu_i2c_scl_obj_t;
+
+
+#define I2C_SDA(index, alt, sda_pin)       \
+{ \
+    .i2c_index = index, \
+    .altfn_index = alt, \
+    .pin = sda_pin, \
+}
+
+#define I2C_SCL(index, alt, scl_pin)       \
+{ \
+    .i2c_index = index, \
+    .altfn_index = alt, \
+    .pin = scl_pin, \
+}
+
+// SPI 
+// TODO: these objects should be condensed into a single 'periph_pin' unless we
+// find a compelling reason to store more unique data in them. 
+
+typedef struct {
+    uint8_t spi_index:4; //Up to 6 SPI units
+    uint8_t altfn_index:4; //Up to 15 alt channels
+    const mcu_pin_obj_t * pin;
+} mcu_spi_sck_obj_t;
+
+typedef struct {
+    uint8_t spi_index:4; 
+    uint8_t altfn_index:4; 
+    const mcu_pin_obj_t * pin;
+} mcu_spi_mosi_obj_t;
+
+typedef struct {
+    uint8_t spi_index:4; 
+    uint8_t altfn_index:4; 
+    const mcu_pin_obj_t * pin;
+} mcu_spi_miso_obj_t;
+
+typedef struct {
+    uint8_t spi_index:4; 
+    uint8_t altfn_index:4; 
+    const mcu_pin_obj_t * pin;
+} mcu_spi_nss_obj_t;
+
+#define SPI(index, alt, spi_pin)       \
+{ \
+    .spi_index = index, \
+    .altfn_index = alt, \
+    .pin = spi_pin, \
+}
+
+// UART
+// TODO: these objects should be condensed into a single 'periph_pin' unless we
+// find a compelling reason to store more unique data in them. 
+
+typedef struct {
+    uint8_t uart_index:4; 
+    uint8_t altfn_index:4; 
+    const mcu_pin_obj_t * pin;
+} mcu_uart_tx_obj_t;
+
+typedef struct {
+    uint8_t uart_index:4; 
+    uint8_t altfn_index:4; 
+    const mcu_pin_obj_t * pin;
+} mcu_uart_rx_obj_t;
+
+#define UART(index, alt, uart_pin)       \
+{ \
+    .uart_index = index, \
+    .altfn_index = alt, \
+    .pin = uart_pin, \
+}
+
+//Timers
+typedef struct {
+    uint8_t tim_index:4; 
+    uint8_t altfn_index:4; 
+    uint8_t channel_index:4;
+    const mcu_pin_obj_t * pin;
+} mcu_tim_pin_obj_t;
+
+#define TIM(index, alt, channel, tim_pin)       \
+{ \
+    .tim_index = index, \
+    .altfn_index = alt, \
+    .channel_index = channel, \
+    .pin = tim_pin, \
+}
+
+//Access Lines
+
+#ifdef STM32F401xE
+#define HAS_DAC 0
+#define HAS_TRNG 0
+#define HAS_BASIC_TIM 0
+#include "stm32f401xe/periph.h"
+#endif
+
+#ifdef STM32F411xE
+#define HAS_DAC 0
+#define HAS_TRNG 0
+#define HAS_BASIC_TIM 0
+#include "stm32f411xe/periph.h"
+#endif
+
+#ifdef STM32F412Zx
+#define HAS_DAC 0
+#define HAS_TRNG 1
+#define HAS_BASIC_TIM 1
+#include "stm32f412zx/periph.h"
+#endif
+
+//Foundation Lines
+
+#ifdef STM32F405xx
+#define HAS_DAC 1
+#define HAS_TRNG 1
+#define HAS_BASIC_TIM 1
+#include "stm32f405xx/periph.h"
+#endif
+
+#ifdef STM32F407xx
+#define HAS_DAC 1
+#define HAS_TRNG 1
+#define HAS_BASIC_TIM 1
+#include "stm32f407xx/periph.h"
+#endif
+
+#endif // __MICROPY_INCLUDED_STM32F4_PERIPHERALS_PERIPH_H__
diff --git a/ports/stm/peripherals/stm32f4/pins.h b/ports/stm/peripherals/stm32f4/pins.h
new file mode 100644
index 000000000..44ef4c1ba
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/pins.h
@@ -0,0 +1,96 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Dan Halbert for Adafruit Industries
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+// DO NOT include this file directly. Use shared-bindings/microcontroller/Pin.h instead to ensure
+// that all necessary includes are already included.
+
+#ifndef __MICROPY_INCLUDED_STM32F4_PERIPHERALS_PINS_H__
+#define __MICROPY_INCLUDED_STM32F4_PERIPHERALS_PINS_H__
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "stm32f4xx_hal.h"
+
+typedef struct {
+    mp_obj_base_t base;
+    uint8_t port:4;
+    uint8_t number:4;
+    uint8_t adc_unit:3; 
+    uint8_t adc_channel:5;
+} mcu_pin_obj_t;
+
+//Standard stm32 adc unit combinations
+#define ADC_1   1
+#define ADC_12  3
+#define ADC_123 7
+#define ADC_3   4
+
+//STM32 ADC pins can have a combination of 1, 2 or all 3 ADCs on a single pin,
+//but all 3 ADCs will share the same input number per pin. 
+//F4 family has 3 ADC max, 24 channels max. 
+#define ADC_INPUT(mask, number) \
+    .adc_unit = mask, \
+    .adc_channel = number,
+
+#define NO_ADC \
+    .adc_unit = 0x00, \
+    .adc_channel = 0x1f
+
+extern const mp_obj_type_t mcu_pin_type;
+
+// STM32 can have up to 9 ports, each restricted to 16 pins
+// We split the pin/port evenly, in contrast to nrf. 
+#define PIN(p_port, p_number, p_adc)       \
+{ \
+    { &mcu_pin_type }, \
+    .port = p_port, \
+    .number = p_number, \
+    p_adc \
+}
+
+// Use illegal pin value to mark unassigned pins.
+#define NO_PIN 0xff
+
+// Choose based on chip
+#ifdef STM32F401xE
+#include "stm32f401xe/pins.h"
+#endif
+#ifdef STM32F411xE
+#include "stm32f411xe/pins.h"
+#endif
+#ifdef STM32F412Zx
+#include "stm32f412zx/pins.h"
+#endif
+#ifdef STM32F405xx
+#include "stm32f405xx/pins.h"
+#endif
+#ifdef STM32F407xx
+#include "stm32f407xx/pins.h"
+#endif
+
+#endif // __MICROPY_INCLUDED_STM32F4_PERIPHERALS_PINS_H__
diff --git a/ports/stm/peripherals/stm32f4/stm32f401xe/clocks.c b/ports/stm/peripherals/stm32f4/stm32f401xe/clocks.c
new file mode 100644
index 000000000..53810af26
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f401xe/clocks.c
@@ -0,0 +1,62 @@
+
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "stm32f4xx_hal.h"
+#include "py/mpconfig.h"
+
+void stm32f4_peripherals_clocks_init(void) {
+    //System clock init
+    RCC_ClkInitTypeDef RCC_ClkInitStruct;
+    RCC_OscInitTypeDef RCC_OscInitStruct;
+
+    /* Enable Power Control clock */
+    __HAL_RCC_PWR_CLK_ENABLE();
+
+    /* The voltage scaling allows optimizing the power consumption when the device is
+       clocked below the maximum system frequency, to update the voltage scaling value
+       regarding system frequency refer to product datasheet.  */
+    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
+
+    /* Enable HSE Oscillator and activate PLL with HSE as source */
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+    RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+    RCC_OscInitStruct.PLL.PLLM = BOARD_OSC_DIV;
+    RCC_OscInitStruct.PLL.PLLN = 336;
+    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
+    RCC_OscInitStruct.PLL.PLLQ = 7;
+    HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+    /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
+       clocks dividers */
+    RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
+    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
+    HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3);
+}
diff --git a/ports/stm/peripherals/stm32f4/stm32f401xe/gpio.c b/ports/stm/peripherals/stm32f4/stm32f401xe/gpio.c
new file mode 100644
index 000000000..7bd619662
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f401xe/gpio.c
@@ -0,0 +1,51 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "stm32f4xx_hal.h"
+#include "stm32f4/gpio.h"
+#include "common-hal/microcontroller/Pin.h"
+
+void stm32f4_peripherals_gpio_init(void) {
+    /* GPIO Ports Clock Enable */
+    __HAL_RCC_GPIOA_CLK_ENABLE();
+    __HAL_RCC_GPIOB_CLK_ENABLE();
+    __HAL_RCC_GPIOC_CLK_ENABLE();
+    __HAL_RCC_GPIOD_CLK_ENABLE();
+    __HAL_RCC_GPIOE_CLK_ENABLE();
+    __HAL_RCC_GPIOH_CLK_ENABLE();
+
+    //Never reset pins
+    never_reset_pin_number(2,14); //PC14 OSC32_IN
+    never_reset_pin_number(2,15); //PC15 OSC32_OUT
+    never_reset_pin_number(0,13); //PA13 SWDIO
+    never_reset_pin_number(0,14); //PA14 SWCLK
+}
+
+//LEDs are inverted on F411 DISCO
+void stm32f4_peripherals_status_led(uint8_t led, uint8_t state) {
+}
+
+
diff --git a/ports/stm/peripherals/stm32f4/stm32f401xe/periph.c b/ports/stm/peripherals/stm32f4/stm32f401xe/periph.c
new file mode 100644
index 000000000..b12084186
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f401xe/periph.c
@@ -0,0 +1,173 @@
+ /*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/obj.h"
+#include "py/mphal.h"
+#include "stm32f4/pins.h"
+#include "stm32f4/periph.h"
+
+// I2C
+
+I2C_TypeDef * mcu_i2c_banks[3] = {I2C1, I2C2, I2C3};
+
+const mcu_i2c_sda_obj_t mcu_i2c_sda_list[5] = {
+    I2C_SDA(1, 4, &pin_PB07),
+    I2C_SDA(1, 4, &pin_PB09),
+    I2C_SDA(2, 9, &pin_PB03),
+    I2C_SDA(3, 4, &pin_PC09),
+    I2C_SDA(3, 9, &pin_PB04),
+};
+
+const mcu_i2c_scl_obj_t mcu_i2c_scl_list[4] = {
+    I2C_SCL(1, 4, &pin_PB06),
+    I2C_SCL(1, 4, &pin_PB08),
+    I2C_SCL(2, 4, &pin_PB10),
+    I2C_SCL(3, 4, &pin_PA08)
+};
+
+// SPI
+
+SPI_TypeDef * mcu_spi_banks[4] = {SPI1, SPI2, SPI3, SPI4};
+
+const mcu_spi_sck_obj_t mcu_spi_sck_list[9] = {
+    SPI(1, 5, &pin_PA05),
+    SPI(1, 5, &pin_PB03),
+    SPI(2, 5, &pin_PB10),
+    SPI(2, 5, &pin_PB13),
+    SPI(2, 5, &pin_PD03),
+    SPI(3, 6, &pin_PB03),
+    SPI(3, 6, &pin_PC10),
+    SPI(4, 5, &pin_PE02),
+    SPI(4, 5, &pin_PE12),
+};
+
+const mcu_spi_mosi_obj_t mcu_spi_mosi_list[9] = {
+    SPI(1, 5, &pin_PA07),
+    SPI(1, 5, &pin_PB05),
+    SPI(2, 5, &pin_PB15),
+    SPI(2, 5, &pin_PC03),
+    SPI(3, 6, &pin_PB05),
+    SPI(3, 6, &pin_PC12),
+    SPI(3, 5, &pin_PD06),
+    SPI(4, 5, &pin_PE06),
+    SPI(4, 5, &pin_PE14),
+};
+
+const mcu_spi_miso_obj_t mcu_spi_miso_list[8] = {
+    SPI(1, 5, &pin_PA06),
+    SPI(1, 5, &pin_PB04),
+    SPI(2, 5, &pin_PB14),
+    SPI(2, 5, &pin_PC02),
+    SPI(3, 6, &pin_PB04),
+    SPI(3, 6, &pin_PC11),
+    SPI(4, 5, &pin_PE05),
+    SPI(4, 5, &pin_PE13),
+};
+
+const mcu_spi_nss_obj_t mcu_spi_nss_list[9] = {
+    SPI(1, 5, &pin_PA04),
+    SPI(1, 5, &pin_PA15),
+    SPI(2, 5, &pin_PB09),
+    SPI(2, 5, &pin_PB12),
+    SPI(3, 6, &pin_PA04),
+    SPI(3, 6, &pin_PA15),
+    SPI(4, 6, &pin_PB12),
+    SPI(4, 5, &pin_PE04),
+    SPI(4, 5, &pin_PE11),
+};
+
+USART_TypeDef * mcu_uart_banks[MAX_UART] = {USART1, USART2, NULL, NULL, NULL, USART6};
+bool mcu_uart_has_usart[MAX_UART] = {true, true, false, false, false, true};
+
+const mcu_uart_tx_obj_t mcu_uart_tx_list[6] = {
+    UART(2, 7, &pin_PA02),
+    UART(1, 7, &pin_PA09),
+    UART(6, 8, &pin_PA11),
+    UART(1, 7, &pin_PB06),
+    UART(6, 8, &pin_PC06),
+    UART(2, 7, &pin_PD05),
+};
+
+const mcu_uart_rx_obj_t mcu_uart_rx_list[6] = {
+    UART(2, 7, &pin_PA03),
+    UART(1, 7, &pin_PA10),
+    UART(6, 8, &pin_PA12),
+    UART(1, 7, &pin_PB07),
+    UART(6, 8, &pin_PC07),
+    UART(2, 7, &pin_PD06),
+};
+
+//Timers
+//TIM6 and TIM7 are basic timers that are only used by DAC, and don't have pins
+TIM_TypeDef * mcu_tim_banks[14] = {TIM1, TIM2, TIM3, TIM4, TIM5, NULL, NULL, NULL, TIM9, TIM10,
+                                    TIM11, NULL, NULL, NULL};
+
+//#define TIM(index, alt, channel, tim_pin)
+const mcu_tim_pin_obj_t mcu_tim_pin_list[44] = {
+    TIM(2,1,1,&pin_PA00),
+    TIM(5,2,1,&pin_PA00),
+    TIM(2,1,2,&pin_PA01),
+    TIM(5,2,2,&pin_PA01),
+    TIM(2,1,3,&pin_PA02),
+    TIM(5,2,3,&pin_PA02),
+    TIM(2,1,4,&pin_PA03),
+    TIM(5,2,4,&pin_PA03),
+    TIM(9,3,1,&pin_PA02),
+    TIM(9,3,2,&pin_PA03),
+    TIM(3,2,1,&pin_PA06),
+    TIM(3,2,2,&pin_PA07),
+    TIM(1,1,1,&pin_PA08),
+    TIM(1,1,2,&pin_PA09),
+    TIM(1,1,3,&pin_PA10),
+    TIM(1,1,4,&pin_PA11),
+    TIM(2,1,1,&pin_PA15),
+    TIM(3,2,3,&pin_PB00),
+    TIM(3,2,4,&pin_PB01),
+    TIM(2,1,2,&pin_PB03),
+    TIM(3,2,1,&pin_PB04),
+    TIM(3,2,2,&pin_PB05),
+    TIM(4,2,1,&pin_PB06),
+    TIM(4,2,2,&pin_PB07),
+    TIM(4,2,3,&pin_PB08),
+    TIM(10,2,1,&pin_PB08),
+    TIM(4,2,4,&pin_PB09),
+    TIM(11,2,1,&pin_PB09),
+    TIM(2,1,3,&pin_PB10),
+    TIM(3,2,1,&pin_PC06),
+    TIM(3,2,2,&pin_PC07),
+    TIM(3,2,3,&pin_PC08),
+    TIM(3,2,4,&pin_PC09),
+    TIM(4,2,1,&pin_PD12),
+    TIM(4,2,2,&pin_PD13),
+    TIM(4,2,3,&pin_PD14),
+    TIM(4,2,4,&pin_PD15),
+    TIM(9,3,1,&pin_PE05),
+    TIM(9,3,2,&pin_PE06),
+    TIM(1,1,1,&pin_PE09),
+    TIM(1,1,2,&pin_PE11),
+    TIM(1,1,3,&pin_PE13),
+    TIM(1,1,4,&pin_PE14),
+};
diff --git a/ports/stm/peripherals/stm32f4/stm32f401xe/periph.h b/ports/stm/peripherals/stm32f4/stm32f401xe/periph.h
new file mode 100644
index 000000000..6085f1ff2
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f401xe/periph.h
@@ -0,0 +1,57 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F401XE_PERIPH_H
+#define MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F401XE_PERIPH_H
+
+//I2C
+extern I2C_TypeDef * mcu_i2c_banks[3];
+
+extern const mcu_i2c_sda_obj_t mcu_i2c_sda_list[5];
+extern const mcu_i2c_scl_obj_t mcu_i2c_scl_list[4];
+
+//SPI
+extern SPI_TypeDef * mcu_spi_banks[4];
+
+extern const mcu_spi_sck_obj_t mcu_spi_sck_list[9];
+extern const mcu_spi_mosi_obj_t mcu_spi_mosi_list[9];
+extern const mcu_spi_miso_obj_t mcu_spi_miso_list[8];
+extern const mcu_spi_nss_obj_t mcu_spi_nss_list[9];
+
+//UART
+extern USART_TypeDef * mcu_uart_banks[MAX_UART];
+extern bool mcu_uart_has_usart[MAX_UART];
+
+extern const mcu_uart_tx_obj_t mcu_uart_tx_list[6];
+extern const mcu_uart_rx_obj_t mcu_uart_rx_list[6];
+
+//Timers
+#define TIM_BANK_ARRAY_LEN 14
+#define TIM_PIN_ARRAY_LEN 44
+TIM_TypeDef * mcu_tim_banks[TIM_BANK_ARRAY_LEN];
+const mcu_tim_pin_obj_t mcu_tim_pin_list[TIM_PIN_ARRAY_LEN];
+
+#endif // MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F401XE_PERIPH_H
\ No newline at end of file
diff --git a/ports/stm/peripherals/stm32f4/stm32f401xe/pins.c b/ports/stm/peripherals/stm32f4/stm32f401xe/pins.c
new file mode 100644
index 000000000..7e88c3dcb
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f401xe/pins.c
@@ -0,0 +1,123 @@
+ /*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/obj.h"
+#include "py/mphal.h"
+#include "stm32f4/pins.h"
+
+const mcu_pin_obj_t pin_PE02 = PIN(4, 2, NO_ADC);
+const mcu_pin_obj_t pin_PE03 = PIN(4, 3, NO_ADC);
+const mcu_pin_obj_t pin_PE04 = PIN(4, 4, NO_ADC);
+const mcu_pin_obj_t pin_PE05 = PIN(4, 5, NO_ADC);
+const mcu_pin_obj_t pin_PE06 = PIN(4, 6, NO_ADC);
+
+const mcu_pin_obj_t pin_PC13 = PIN(2, 13, NO_ADC); //anti-tamp
+const mcu_pin_obj_t pin_PC14 = PIN(2, 14, NO_ADC); //OSC32_IN
+const mcu_pin_obj_t pin_PC15 = PIN(2, 15, NO_ADC); //OSC32_OUT
+
+const mcu_pin_obj_t pin_PC00 = PIN(2, 0, ADC_INPUT(ADC_1,10));
+const mcu_pin_obj_t pin_PC01 = PIN(2, 1, ADC_INPUT(ADC_1,11));
+const mcu_pin_obj_t pin_PC02 = PIN(2, 2, ADC_INPUT(ADC_1,12));
+const mcu_pin_obj_t pin_PC03 = PIN(2, 3, ADC_INPUT(ADC_1,13));
+
+const mcu_pin_obj_t pin_PA00 = PIN(0, 0, ADC_INPUT(ADC_1,0));
+const mcu_pin_obj_t pin_PA01 = PIN(0, 1, ADC_INPUT(ADC_1,1));
+const mcu_pin_obj_t pin_PA02 = PIN(0, 2, ADC_INPUT(ADC_1,2));
+const mcu_pin_obj_t pin_PA03 = PIN(0, 3, ADC_INPUT(ADC_1,3));
+const mcu_pin_obj_t pin_PA04 = PIN(0, 4, ADC_INPUT(ADC_1,4));
+const mcu_pin_obj_t pin_PA05 = PIN(0, 5, ADC_INPUT(ADC_1,5));
+const mcu_pin_obj_t pin_PA06 = PIN(0, 6, ADC_INPUT(ADC_1,6));
+const mcu_pin_obj_t pin_PA07 = PIN(0, 7, ADC_INPUT(ADC_1,7));
+
+const mcu_pin_obj_t pin_PC04 = PIN(2, 4, ADC_INPUT(ADC_1,14));
+const mcu_pin_obj_t pin_PC05 = PIN(2, 5, ADC_INPUT(ADC_1,15));
+
+const mcu_pin_obj_t pin_PB00 = PIN(1, 0, ADC_INPUT(ADC_1,8));
+const mcu_pin_obj_t pin_PB01 = PIN(1, 1, ADC_INPUT(ADC_1,9));
+const mcu_pin_obj_t pin_PB02 = PIN(1, 2, NO_ADC);
+
+const mcu_pin_obj_t pin_PE07 = PIN(4, 7, NO_ADC);
+const mcu_pin_obj_t pin_PE08 = PIN(4, 8, NO_ADC);
+const mcu_pin_obj_t pin_PE09 = PIN(4, 9, NO_ADC);
+const mcu_pin_obj_t pin_PE10 = PIN(4, 10, NO_ADC);
+const mcu_pin_obj_t pin_PE11 = PIN(4, 11, NO_ADC);
+const mcu_pin_obj_t pin_PE12 = PIN(4, 12, NO_ADC);
+const mcu_pin_obj_t pin_PE13 = PIN(4, 13, NO_ADC);
+const mcu_pin_obj_t pin_PE14 = PIN(4, 14, NO_ADC);
+const mcu_pin_obj_t pin_PE15 = PIN(4, 15, NO_ADC);
+
+const mcu_pin_obj_t pin_PB10 = PIN(1, 10, NO_ADC);
+const mcu_pin_obj_t pin_PB12 = PIN(1, 12, NO_ADC);
+const mcu_pin_obj_t pin_PB13 = PIN(1, 13, NO_ADC);
+const mcu_pin_obj_t pin_PB14 = PIN(1, 14, NO_ADC);
+const mcu_pin_obj_t pin_PB15 = PIN(1, 15, NO_ADC);
+
+const mcu_pin_obj_t pin_PD08 = PIN(3, 8, NO_ADC);
+const mcu_pin_obj_t pin_PD09 = PIN(3, 9, NO_ADC);
+const mcu_pin_obj_t pin_PD10 = PIN(3, 10, NO_ADC);
+const mcu_pin_obj_t pin_PD11 = PIN(3, 11, NO_ADC);
+const mcu_pin_obj_t pin_PD12 = PIN(3, 12, NO_ADC);
+const mcu_pin_obj_t pin_PD13 = PIN(3, 13, NO_ADC);
+const mcu_pin_obj_t pin_PD14 = PIN(3, 14, NO_ADC);
+const mcu_pin_obj_t pin_PD15 = PIN(3, 15, NO_ADC);
+
+const mcu_pin_obj_t pin_PC06 = PIN(2, 6, NO_ADC);
+const mcu_pin_obj_t pin_PC07 = PIN(2, 7, NO_ADC);
+const mcu_pin_obj_t pin_PC08 = PIN(2, 8, NO_ADC);
+const mcu_pin_obj_t pin_PC09 = PIN(2, 9, NO_ADC);
+
+const mcu_pin_obj_t pin_PA08 = PIN(0, 8, NO_ADC);
+const mcu_pin_obj_t pin_PA09 = PIN(0, 9, NO_ADC);
+const mcu_pin_obj_t pin_PA10 = PIN(0, 10, NO_ADC);
+const mcu_pin_obj_t pin_PA11 = PIN(0, 11, NO_ADC);
+const mcu_pin_obj_t pin_PA12 = PIN(0, 12, NO_ADC);
+const mcu_pin_obj_t pin_PA13 = PIN(0, 13, NO_ADC); //SWDIO
+const mcu_pin_obj_t pin_PA14 = PIN(0, 14, NO_ADC); //SWCLK
+const mcu_pin_obj_t pin_PA15 = PIN(0, 15, NO_ADC); //JTDI
+
+const mcu_pin_obj_t pin_PC10 = PIN(2, 10, NO_ADC);
+const mcu_pin_obj_t pin_PC11 = PIN(2, 11, NO_ADC);
+const mcu_pin_obj_t pin_PC12 = PIN(2, 12, NO_ADC);
+
+const mcu_pin_obj_t pin_PD00 = PIN(3, 0, NO_ADC);
+const mcu_pin_obj_t pin_PD01 = PIN(3, 1, NO_ADC);
+const mcu_pin_obj_t pin_PD02 = PIN(3, 2, NO_ADC);
+const mcu_pin_obj_t pin_PD03 = PIN(3, 3, NO_ADC);
+const mcu_pin_obj_t pin_PD04 = PIN(3, 4, NO_ADC);
+const mcu_pin_obj_t pin_PD05 = PIN(3, 5, NO_ADC);
+const mcu_pin_obj_t pin_PD06 = PIN(3, 6, NO_ADC);
+const mcu_pin_obj_t pin_PD07 = PIN(3, 7, NO_ADC);
+
+const mcu_pin_obj_t pin_PB03 = PIN(1, 3, NO_ADC);
+const mcu_pin_obj_t pin_PB04 = PIN(1, 4, NO_ADC);
+const mcu_pin_obj_t pin_PB05 = PIN(1, 5, NO_ADC);
+const mcu_pin_obj_t pin_PB06 = PIN(1, 6, NO_ADC);
+const mcu_pin_obj_t pin_PB07 = PIN(1, 7, NO_ADC);
+const mcu_pin_obj_t pin_PB08 = PIN(1, 8, NO_ADC);
+const mcu_pin_obj_t pin_PB09 = PIN(1, 9, NO_ADC);
+
+const mcu_pin_obj_t pin_PE00 = PIN(4, 0, NO_ADC);
+const mcu_pin_obj_t pin_PE01 = PIN(4, 1, NO_ADC);
\ No newline at end of file
diff --git a/ports/stm/peripherals/stm32f4/stm32f401xe/pins.h b/ports/stm/peripherals/stm32f4/stm32f401xe/pins.h
new file mode 100644
index 000000000..09bc8f13e
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f401xe/pins.h
@@ -0,0 +1,121 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F401XE_PINS_H
+#define MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F401XE_PINS_H
+
+//Pins in datasheet order: DocID026289 Rev 7 page 38. LQFP100 only
+//pg 38
+extern const mcu_pin_obj_t pin_PE02;
+extern const mcu_pin_obj_t pin_PE03;
+extern const mcu_pin_obj_t pin_PE04;
+extern const mcu_pin_obj_t pin_PE05;
+//pg 39
+extern const mcu_pin_obj_t pin_PE06;
+extern const mcu_pin_obj_t pin_PC13;
+extern const mcu_pin_obj_t pin_PC14;
+extern const mcu_pin_obj_t pin_PC15;
+extern const mcu_pin_obj_t pin_PC00;
+extern const mcu_pin_obj_t pin_PC01;
+extern const mcu_pin_obj_t pin_PC02;
+extern const mcu_pin_obj_t pin_PC03;
+//pg 40
+extern const mcu_pin_obj_t pin_PA00;
+extern const mcu_pin_obj_t pin_PA01;
+extern const mcu_pin_obj_t pin_PA02;
+extern const mcu_pin_obj_t pin_PA03;
+extern const mcu_pin_obj_t pin_PA04;
+extern const mcu_pin_obj_t pin_PA05;
+extern const mcu_pin_obj_t pin_PA06;
+extern const mcu_pin_obj_t pin_PA07;
+//pg 41
+extern const mcu_pin_obj_t pin_PC04;
+extern const mcu_pin_obj_t pin_PC05;
+extern const mcu_pin_obj_t pin_PB00;
+extern const mcu_pin_obj_t pin_PB01;
+extern const mcu_pin_obj_t pin_PB02;
+extern const mcu_pin_obj_t pin_PE07;
+extern const mcu_pin_obj_t pin_PE08;
+extern const mcu_pin_obj_t pin_PE09;
+extern const mcu_pin_obj_t pin_PE10;
+extern const mcu_pin_obj_t pin_PE11;
+extern const mcu_pin_obj_t pin_PE12;
+extern const mcu_pin_obj_t pin_PE13;
+extern const mcu_pin_obj_t pin_PE14;
+extern const mcu_pin_obj_t pin_PE15;
+//pg 42
+extern const mcu_pin_obj_t pin_PB10;
+extern const mcu_pin_obj_t pin_PB12;
+extern const mcu_pin_obj_t pin_PB13;
+extern const mcu_pin_obj_t pin_PB14;
+extern const mcu_pin_obj_t pin_PB15;
+extern const mcu_pin_obj_t pin_PD08;
+extern const mcu_pin_obj_t pin_PD09;
+extern const mcu_pin_obj_t pin_PD10;
+extern const mcu_pin_obj_t pin_PD11;
+extern const mcu_pin_obj_t pin_PD12;
+//pg 43
+extern const mcu_pin_obj_t pin_PD13;
+extern const mcu_pin_obj_t pin_PD14;
+extern const mcu_pin_obj_t pin_PD15;
+extern const mcu_pin_obj_t pin_PC06;
+extern const mcu_pin_obj_t pin_PC07;
+extern const mcu_pin_obj_t pin_PC08;
+extern const mcu_pin_obj_t pin_PC09;
+extern const mcu_pin_obj_t pin_PA08;
+extern const mcu_pin_obj_t pin_PA09;
+//pg 44
+extern const mcu_pin_obj_t pin_PA10;
+extern const mcu_pin_obj_t pin_PA11;
+extern const mcu_pin_obj_t pin_PA12;
+extern const mcu_pin_obj_t pin_PA13;
+extern const mcu_pin_obj_t pin_PA14;
+extern const mcu_pin_obj_t pin_PA15;
+extern const mcu_pin_obj_t pin_PC10;
+extern const mcu_pin_obj_t pin_PC11;
+extern const mcu_pin_obj_t pin_PC12;
+//pg 45
+extern const mcu_pin_obj_t pin_PD00;
+extern const mcu_pin_obj_t pin_PD01;
+extern const mcu_pin_obj_t pin_PD02;
+extern const mcu_pin_obj_t pin_PD03;
+extern const mcu_pin_obj_t pin_PD04;
+extern const mcu_pin_obj_t pin_PD05;
+extern const mcu_pin_obj_t pin_PD06;
+extern const mcu_pin_obj_t pin_PD07;
+extern const mcu_pin_obj_t pin_PB03;
+extern const mcu_pin_obj_t pin_PB04;
+extern const mcu_pin_obj_t pin_PB05;
+extern const mcu_pin_obj_t pin_PB06;
+//pg 46
+extern const mcu_pin_obj_t pin_PB07;
+extern const mcu_pin_obj_t pin_PB08;
+extern const mcu_pin_obj_t pin_PB09;
+extern const mcu_pin_obj_t pin_PE00;
+extern const mcu_pin_obj_t pin_PE01;
+
+
+#endif // MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F401XE_PINS_H
diff --git a/ports/stm/peripherals/stm32f4/stm32f405xx/clocks.c b/ports/stm/peripherals/stm32f4/stm32f405xx/clocks.c
new file mode 100644
index 000000000..2afca64e8
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f405xx/clocks.c
@@ -0,0 +1,64 @@
+
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "stm32f4xx_hal.h"
+#include "py/mpconfig.h"
+
+void stm32f4_peripherals_clocks_init(void) {
+    //TODO: All parameters must be moved to board level, due to relationship with HSE Osc. 
+
+    //System clock init
+    RCC_ClkInitTypeDef RCC_ClkInitStruct;
+    RCC_OscInitTypeDef RCC_OscInitStruct;
+
+    /* Enable Power Control clock */
+    __HAL_RCC_PWR_CLK_ENABLE();
+
+    /* The voltage scaling allows optimizing the power consumption when the device is
+     clocked below the maximum system frequency, to update the voltage scaling value
+     regarding system frequency refer to product datasheet.  */
+    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
+
+    /* Enable HSE Oscillator and activate PLL with HSE as source */
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+    RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+    RCC_OscInitStruct.PLL.PLLM = BOARD_OSC_DIV;
+    RCC_OscInitStruct.PLL.PLLN = 336;
+    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
+    RCC_OscInitStruct.PLL.PLLQ = 7;
+    HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+    /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
+     clocks dividers */
+    RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
+    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
+    HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);
+}
diff --git a/ports/stm/peripherals/stm32f4/stm32f405xx/gpio.c b/ports/stm/peripherals/stm32f4/stm32f405xx/gpio.c
new file mode 100644
index 000000000..d1eaa90d1
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f405xx/gpio.c
@@ -0,0 +1,60 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "stm32f4xx_hal.h"
+#include "stm32f4/gpio.h"
+#include "common-hal/microcontroller/Pin.h"
+
+void stm32f4_peripherals_gpio_init(void) {
+    //Enable all GPIO for now
+    __HAL_RCC_GPIOA_CLK_ENABLE();
+    __HAL_RCC_GPIOB_CLK_ENABLE();
+    __HAL_RCC_GPIOC_CLK_ENABLE();
+    __HAL_RCC_GPIOD_CLK_ENABLE();
+    __HAL_RCC_GPIOE_CLK_ENABLE();
+    __HAL_RCC_GPIOF_CLK_ENABLE();
+    __HAL_RCC_GPIOG_CLK_ENABLE();
+
+    //Never reset pins
+    never_reset_pin_number(2,13); //PC13 anti tamp
+    never_reset_pin_number(2,14); //PC14 OSC32_IN
+    never_reset_pin_number(2,15); //PC15 OSC32_OUT
+    never_reset_pin_number(0,13); //PA13 SWDIO
+    never_reset_pin_number(0,14); //PA14 SWCLK
+    // never_reset_pin_number(0,15); //PA15 JTDI
+    // never_reset_pin_number(1,3); //PB3 JTDO
+    // never_reset_pin_number(1,4); //PB4 JTRST
+
+    // Port H is not included in GPIO port array
+    // never_reset_pin_number(5,0); //PH0 JTDO   
+    // never_reset_pin_number(5,1); //PH1 JTRST
+}
+
+void stm32f4_peripherals_status_led(uint8_t led, uint8_t state) {
+
+}
+
+
diff --git a/ports/stm/peripherals/stm32f4/stm32f405xx/periph.c b/ports/stm/peripherals/stm32f4/stm32f405xx/periph.c
new file mode 100644
index 000000000..bc03f7c7b
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f405xx/periph.c
@@ -0,0 +1,194 @@
+ /*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/obj.h"
+#include "py/mphal.h"
+#include "stm32f4/pins.h"
+#include "stm32f4/periph.h"
+
+// I2C
+
+I2C_TypeDef * mcu_i2c_banks[3] = {I2C1, I2C2, I2C3};
+
+const mcu_i2c_sda_obj_t mcu_i2c_sda_list[4] = {
+    I2C_SDA(1, 4, &pin_PB07),
+    I2C_SDA(1, 4, &pin_PB09),
+    I2C_SDA(2, 4, &pin_PB11),
+    I2C_SDA(3, 4, &pin_PC09),
+};
+
+const mcu_i2c_scl_obj_t mcu_i2c_scl_list[4] = {
+    I2C_SCL(1, 4, &pin_PB06),
+    I2C_SCL(1, 4, &pin_PB08),
+    I2C_SCL(2, 4, &pin_PB10),
+    I2C_SCL(3, 4, &pin_PA08)
+};
+
+SPI_TypeDef * mcu_spi_banks[3] = {SPI1, SPI2, SPI3};
+
+const mcu_spi_sck_obj_t mcu_spi_sck_list[7] = {
+    SPI(1, 5, &pin_PA05),
+    SPI(1, 5, &pin_PB03),
+    SPI(2, 5, &pin_PB10),
+    SPI(2, 5, &pin_PB13),
+    SPI(2, 5, &pin_PC07),
+    SPI(3, 6, &pin_PB03),
+    SPI(3, 6, &pin_PC10),
+};
+
+const mcu_spi_mosi_obj_t mcu_spi_mosi_list[6] = {
+    SPI(1, 5, &pin_PA07),
+    SPI(1, 5, &pin_PB05),
+    SPI(2, 5, &pin_PB15),
+    SPI(2, 5, &pin_PC03),
+    SPI(3, 6, &pin_PB05),
+    SPI(3, 6, &pin_PC12),
+};
+
+const mcu_spi_miso_obj_t mcu_spi_miso_list[6] = {
+    SPI(1, 5, &pin_PA06),
+    SPI(1, 5, &pin_PB04),
+    SPI(2, 5, &pin_PB14),
+    SPI(2, 5, &pin_PC02),
+    SPI(3, 6, &pin_PB04),
+    SPI(3, 6, &pin_PC11),
+};
+
+const mcu_spi_nss_obj_t mcu_spi_nss_list[6] = {
+    SPI(1, 5, &pin_PA04),
+    SPI(1, 5, &pin_PA15),
+    SPI(2, 5, &pin_PB09),
+    SPI(2, 5, &pin_PB12),
+    SPI(3, 6, &pin_PA04),
+    SPI(3, 6, &pin_PA15),
+};
+
+USART_TypeDef * mcu_uart_banks[MAX_UART] = {USART1, USART2, USART3, UART4, UART5, USART6};
+bool mcu_uart_has_usart[MAX_UART] = {true, true, true, false, false, true};
+
+const mcu_uart_tx_obj_t mcu_uart_tx_list[12] = {
+    UART(4, 8, &pin_PA00),
+    UART(2, 7, &pin_PA02),
+    UART(1, 7, &pin_PA09),
+    UART(1, 7, &pin_PB06),
+    UART(3, 7, &pin_PB10),
+    UART(6, 8, &pin_PC06),
+    UART(3, 7, &pin_PC10),
+    UART(4, 8, &pin_PC10),
+    UART(5, 8, &pin_PC12),
+    UART(2, 7, &pin_PD05),
+    UART(3, 7, &pin_PD08),
+    UART(6, 8, &pin_PG14),
+};
+
+const mcu_uart_rx_obj_t mcu_uart_rx_list[12] = {
+    UART(4, 8, &pin_PA01),
+    UART(2, 7, &pin_PA03),
+    UART(1, 7, &pin_PA10),
+    UART(1, 7, &pin_PB07),
+    UART(3, 7, &pin_PB11),
+    UART(6, 8, &pin_PC07),
+    UART(3, 7, &pin_PC11),
+    UART(4, 8, &pin_PC11),
+    UART(5, 8, &pin_PD02),
+    UART(2, 7, &pin_PD06),
+    UART(3, 7, &pin_PD09),
+    UART(6, 8, &pin_PG09),
+};
+
+//Timers
+//TIM6 and TIM7 are basic timers that are only used by DAC, and don't have pins
+TIM_TypeDef * mcu_tim_banks[14] = {TIM1, TIM2, TIM3, TIM4, TIM5, NULL, NULL, TIM8, TIM9, TIM10,
+                                    TIM11, TIM12, TIM13, TIM14};
+
+const mcu_tim_pin_obj_t mcu_tim_pin_list[56] = {
+    TIM(2,1,1,&pin_PA00),
+    TIM(5,2,1,&pin_PA00),
+    TIM(2,1,2,&pin_PA01),
+    TIM(5,2,2,&pin_PA01),
+    TIM(2,1,3,&pin_PA02),
+    TIM(5,2,3,&pin_PA02),
+    TIM(2,1,4,&pin_PA03),
+    TIM(5,2,4,&pin_PA03),
+    TIM(9,3,1,&pin_PA02),
+    TIM(9,3,2,&pin_PA03),
+    TIM(3,2,1,&pin_PA06),
+    TIM(13,9,1,&pin_PA06),
+    TIM(3,2,2,&pin_PA07),
+    TIM(14,9,1,&pin_PA07),
+    TIM(1,1,1,&pin_PA08),
+    TIM(1,1,2,&pin_PA09),
+    TIM(1,1,3,&pin_PA10),
+    TIM(1,1,4,&pin_PA11),
+    TIM(2,1,1,&pin_PA15),
+    TIM(3,2,3,&pin_PB00),
+    TIM(3,2,4,&pin_PB01),
+    TIM(2,1,2,&pin_PB03),
+    TIM(3,2,1,&pin_PB04),
+    TIM(3,2,2,&pin_PB05),
+    TIM(4,2,1,&pin_PB06),
+    TIM(4,2,2,&pin_PB07),
+    TIM(4,2,3,&pin_PB08),
+    TIM(10,2,1,&pin_PB08),
+    TIM(4,2,4,&pin_PB09),
+    TIM(11,2,1,&pin_PB09),
+    TIM(2,1,3,&pin_PB10),
+    TIM(2,1,4,&pin_PB11),
+    TIM(12,9,1,&pin_PB14),
+    TIM(12,9,2,&pin_PB15),
+    TIM(3,2,1,&pin_PC06),
+    TIM(3,2,2,&pin_PC07),
+    TIM(3,2,3,&pin_PC08),
+    TIM(3,2,4,&pin_PC09),
+    TIM(8,3,1,&pin_PC06),
+    TIM(8,3,2,&pin_PC07),
+    TIM(8,3,3,&pin_PC08),
+    TIM(8,3,4,&pin_PC09),
+    TIM(4,2,1,&pin_PD12),
+    TIM(4,2,2,&pin_PD13),
+    TIM(4,2,3,&pin_PD14),
+    TIM(4,2,4,&pin_PD15),
+    TIM(9,3,1,&pin_PE05),
+    TIM(9,3,2,&pin_PE06),
+    TIM(1,1,1,&pin_PE09),
+    TIM(1,1,2,&pin_PE11),
+    TIM(1,1,3,&pin_PE13),
+    TIM(1,1,4,&pin_PE14),
+    TIM(10,3,1,&pin_PF06),
+    TIM(11,3,1,&pin_PF07),
+    TIM(13,9,1,&pin_PF08),
+    TIM(14,9,1,&pin_PF09),
+    // TIM(12,9,1,&pin_PH06), //TODO: include these when pin map is expanded
+    // TIM(12,9,2,&pin_PH09),
+    // TIM(5,2,1,&pin_PH10),
+    // TIM(5,2,2,&pin_PH11),
+    // TIM(5,2,3,&pin_PH12),
+    // TIM(5,2,4,&pin_PI00),
+    // TIM(8,3,4,&pin_PI02),
+    // TIM(8,3,1,&pin_PI05),
+    // TIM(8,3,2,&pin_PI06),
+    // TIM(8,3,3,&pin_PI07),
+};
diff --git a/ports/stm/peripherals/stm32f4/stm32f405xx/periph.h b/ports/stm/peripherals/stm32f4/stm32f405xx/periph.h
new file mode 100644
index 000000000..e87e79857
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f405xx/periph.h
@@ -0,0 +1,57 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F405XX_PERIPH_H
+#define MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F405XX_PERIPH_H
+
+//I2C
+extern I2C_TypeDef * mcu_i2c_banks[3];
+
+extern const mcu_i2c_sda_obj_t mcu_i2c_sda_list[4];
+extern const mcu_i2c_scl_obj_t mcu_i2c_scl_list[4];
+
+//SPI
+extern SPI_TypeDef * mcu_spi_banks[3];
+
+extern const mcu_spi_sck_obj_t mcu_spi_sck_list[7];
+extern const mcu_spi_mosi_obj_t mcu_spi_mosi_list[6];
+extern const mcu_spi_miso_obj_t mcu_spi_miso_list[6];
+extern const mcu_spi_nss_obj_t mcu_spi_nss_list[6];
+
+//UART
+extern USART_TypeDef * mcu_uart_banks[MAX_UART];
+extern bool mcu_uart_has_usart[MAX_UART];
+
+extern const mcu_uart_tx_obj_t mcu_uart_tx_list[12];
+extern const mcu_uart_rx_obj_t mcu_uart_rx_list[12];
+
+//Timers
+#define TIM_BANK_ARRAY_LEN 14
+#define TIM_PIN_ARRAY_LEN 56
+TIM_TypeDef * mcu_tim_banks[TIM_BANK_ARRAY_LEN];
+const mcu_tim_pin_obj_t mcu_tim_pin_list[TIM_PIN_ARRAY_LEN];
+
+#endif // MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F405XX_PERIPH_H
\ No newline at end of file
diff --git a/ports/stm/peripherals/stm32f4/stm32f405xx/pins.c b/ports/stm/peripherals/stm32f4/stm32f405xx/pins.c
new file mode 100644
index 000000000..86445fe14
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f405xx/pins.c
@@ -0,0 +1,161 @@
+ /*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/obj.h"
+#include "py/mphal.h"
+#include "stm32f4/pins.h"
+
+const mcu_pin_obj_t pin_PE02 = PIN(4, 2, NO_ADC);
+const mcu_pin_obj_t pin_PE03 = PIN(4, 3, NO_ADC);
+const mcu_pin_obj_t pin_PE04 = PIN(4, 4, NO_ADC);
+const mcu_pin_obj_t pin_PE05 = PIN(4, 5, NO_ADC);
+const mcu_pin_obj_t pin_PE06 = PIN(4, 6, NO_ADC);
+
+const mcu_pin_obj_t pin_PC13 = PIN(2, 13, NO_ADC); //anti-tamp
+const mcu_pin_obj_t pin_PC14 = PIN(2, 14, NO_ADC); //OSC32_IN
+const mcu_pin_obj_t pin_PC15 = PIN(2, 15, NO_ADC); //OSC32_OUT
+
+const mcu_pin_obj_t pin_PF00 = PIN(5, 0, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PF01 = PIN(5, 1, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PF02 = PIN(5, 2, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PF03 = PIN(5, 3, ADC_INPUT(ADC_3,9));   // 144 only 
+const mcu_pin_obj_t pin_PF04 = PIN(5, 4, ADC_INPUT(ADC_3,14));   // 144 only 
+const mcu_pin_obj_t pin_PF05 = PIN(5, 5, ADC_INPUT(ADC_3,15));   // 144 only 
+const mcu_pin_obj_t pin_PF06 = PIN(5, 6, ADC_INPUT(ADC_3,4));   // 144 only 
+const mcu_pin_obj_t pin_PF07 = PIN(5, 7, ADC_INPUT(ADC_3,5));   // 144 only 
+const mcu_pin_obj_t pin_PF08 = PIN(5, 8, ADC_INPUT(ADC_3,6));   // 144 only 
+const mcu_pin_obj_t pin_PF09 = PIN(5, 9, ADC_INPUT(ADC_3,7));   // 144 only 
+const mcu_pin_obj_t pin_PF10 = PIN(5, 10, ADC_INPUT(ADC_3,8)); // 144 only 
+
+const mcu_pin_obj_t pin_PC00 = PIN(2, 0, ADC_INPUT(ADC_123,10));
+const mcu_pin_obj_t pin_PC01 = PIN(2, 1, ADC_INPUT(ADC_123,11));
+const mcu_pin_obj_t pin_PC02 = PIN(2, 2, ADC_INPUT(ADC_123,12));
+const mcu_pin_obj_t pin_PC03 = PIN(2, 3, ADC_INPUT(ADC_123,13));
+
+const mcu_pin_obj_t pin_PA00 = PIN(0, 0, ADC_INPUT(ADC_123,0));
+const mcu_pin_obj_t pin_PA01 = PIN(0, 1, ADC_INPUT(ADC_123,1));
+const mcu_pin_obj_t pin_PA02 = PIN(0, 2, ADC_INPUT(ADC_123,2));
+const mcu_pin_obj_t pin_PA03 = PIN(0, 3, ADC_INPUT(ADC_123,3));
+const mcu_pin_obj_t pin_PA04 = PIN(0, 4, ADC_INPUT(ADC_12,4));
+const mcu_pin_obj_t pin_PA05 = PIN(0, 5, ADC_INPUT(ADC_12,5));
+const mcu_pin_obj_t pin_PA06 = PIN(0, 6, ADC_INPUT(ADC_12,6));
+const mcu_pin_obj_t pin_PA07 = PIN(0, 7, ADC_INPUT(ADC_12,7));
+
+const mcu_pin_obj_t pin_PC04 = PIN(2, 4, ADC_INPUT(ADC_12,14));
+const mcu_pin_obj_t pin_PC05 = PIN(2, 5, ADC_INPUT(ADC_12,15));
+
+const mcu_pin_obj_t pin_PB00 = PIN(1, 0, ADC_INPUT(ADC_12,8));
+const mcu_pin_obj_t pin_PB01 = PIN(1, 1, ADC_INPUT(ADC_12,9));
+const mcu_pin_obj_t pin_PB02 = PIN(1, 2, NO_ADC); //BOOT1
+
+const mcu_pin_obj_t pin_PF11 = PIN(5, 11, NO_ADC); // 144 only 
+const mcu_pin_obj_t pin_PF12 = PIN(5, 12, NO_ADC); // 144 only 
+const mcu_pin_obj_t pin_PF13 = PIN(5, 13, NO_ADC); // 144 only 
+const mcu_pin_obj_t pin_PF14 = PIN(5, 14, NO_ADC); // 144 only 
+const mcu_pin_obj_t pin_PF15 = PIN(5, 15, NO_ADC); // 144 only 
+
+const mcu_pin_obj_t pin_PG00 = PIN(6, 0, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PG01 = PIN(6, 1, NO_ADC);   // 144 only 
+
+const mcu_pin_obj_t pin_PE07 = PIN(4, 7, NO_ADC);
+const mcu_pin_obj_t pin_PE08 = PIN(4, 8, NO_ADC);
+const mcu_pin_obj_t pin_PE09 = PIN(4, 9, NO_ADC);
+const mcu_pin_obj_t pin_PE10 = PIN(4, 10, NO_ADC);
+const mcu_pin_obj_t pin_PE11 = PIN(4, 11, NO_ADC);
+const mcu_pin_obj_t pin_PE12 = PIN(4, 12, NO_ADC);
+const mcu_pin_obj_t pin_PE13 = PIN(4, 13, NO_ADC);
+const mcu_pin_obj_t pin_PE14 = PIN(4, 14, NO_ADC);
+const mcu_pin_obj_t pin_PE15 = PIN(4, 15, NO_ADC);
+
+const mcu_pin_obj_t pin_PB10 = PIN(1, 10, NO_ADC);
+const mcu_pin_obj_t pin_PB11 = PIN(1, 11, NO_ADC); 
+const mcu_pin_obj_t pin_PB12 = PIN(1, 12, NO_ADC);
+const mcu_pin_obj_t pin_PB13 = PIN(1, 13, NO_ADC);
+const mcu_pin_obj_t pin_PB14 = PIN(1, 14, NO_ADC);
+const mcu_pin_obj_t pin_PB15 = PIN(1, 15, NO_ADC);
+
+const mcu_pin_obj_t pin_PD08 = PIN(3, 8, NO_ADC);
+const mcu_pin_obj_t pin_PD09 = PIN(3, 9, NO_ADC);
+const mcu_pin_obj_t pin_PD10 = PIN(3, 10, NO_ADC);
+const mcu_pin_obj_t pin_PD11 = PIN(3, 11, NO_ADC);
+const mcu_pin_obj_t pin_PD12 = PIN(3, 12, NO_ADC);
+const mcu_pin_obj_t pin_PD13 = PIN(3, 13, NO_ADC);
+const mcu_pin_obj_t pin_PD14 = PIN(3, 14, NO_ADC);
+const mcu_pin_obj_t pin_PD15 = PIN(3, 15, NO_ADC);
+
+const mcu_pin_obj_t pin_PG02 = PIN(6, 2, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG03 = PIN(6, 3, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG04 = PIN(6, 4, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG05 = PIN(6, 5, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG06 = PIN(6, 6, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG07 = PIN(6, 7, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG08 = PIN(6, 8, NO_ADC);  // 144 only
+
+const mcu_pin_obj_t pin_PC06 = PIN(2, 6, NO_ADC);
+const mcu_pin_obj_t pin_PC07 = PIN(2, 7, NO_ADC);
+const mcu_pin_obj_t pin_PC08 = PIN(2, 8, NO_ADC);
+const mcu_pin_obj_t pin_PC09 = PIN(2, 9, NO_ADC);
+
+const mcu_pin_obj_t pin_PA08 = PIN(0, 8, NO_ADC);
+const mcu_pin_obj_t pin_PA09 = PIN(0, 9, NO_ADC);
+const mcu_pin_obj_t pin_PA10 = PIN(0, 10, NO_ADC);
+const mcu_pin_obj_t pin_PA11 = PIN(0, 11, NO_ADC);
+const mcu_pin_obj_t pin_PA12 = PIN(0, 12, NO_ADC);
+const mcu_pin_obj_t pin_PA13 = PIN(0, 13, NO_ADC);
+const mcu_pin_obj_t pin_PA14 = PIN(0, 14, NO_ADC);
+const mcu_pin_obj_t pin_PA15 = PIN(0, 15, NO_ADC);
+
+const mcu_pin_obj_t pin_PC10 = PIN(2, 10, NO_ADC);
+const mcu_pin_obj_t pin_PC11 = PIN(2, 11, NO_ADC);
+const mcu_pin_obj_t pin_PC12 = PIN(2, 12, NO_ADC);
+
+const mcu_pin_obj_t pin_PD00 = PIN(3, 0, NO_ADC);
+const mcu_pin_obj_t pin_PD01 = PIN(3, 1, NO_ADC);
+const mcu_pin_obj_t pin_PD02 = PIN(3, 2, NO_ADC);
+const mcu_pin_obj_t pin_PD03 = PIN(3, 3, NO_ADC);
+const mcu_pin_obj_t pin_PD04 = PIN(3, 4, NO_ADC);
+const mcu_pin_obj_t pin_PD05 = PIN(3, 5, NO_ADC);
+const mcu_pin_obj_t pin_PD06 = PIN(3, 6, NO_ADC);
+const mcu_pin_obj_t pin_PD07 = PIN(3, 7, NO_ADC);
+
+const mcu_pin_obj_t pin_PG09 = PIN(6, 9, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG10 = PIN(6, 10, NO_ADC); // 144 only
+const mcu_pin_obj_t pin_PG11 = PIN(6, 11, NO_ADC); // 144 only
+const mcu_pin_obj_t pin_PG12 = PIN(6, 12, NO_ADC); // 144 only
+const mcu_pin_obj_t pin_PG13 = PIN(6, 13, NO_ADC); // 144 only
+const mcu_pin_obj_t pin_PG14 = PIN(6, 14, NO_ADC); // 144 only
+const mcu_pin_obj_t pin_PG15 = PIN(6, 15, NO_ADC); // 144 only
+
+const mcu_pin_obj_t pin_PB03 = PIN(1, 3, NO_ADC);
+const mcu_pin_obj_t pin_PB04 = PIN(1, 4, NO_ADC);
+const mcu_pin_obj_t pin_PB05 = PIN(1, 5, NO_ADC);
+const mcu_pin_obj_t pin_PB06 = PIN(1, 6, NO_ADC);
+const mcu_pin_obj_t pin_PB07 = PIN(1, 7, NO_ADC);
+const mcu_pin_obj_t pin_PB08 = PIN(1, 8, NO_ADC);
+const mcu_pin_obj_t pin_PB09 = PIN(1, 9, NO_ADC);
+
+const mcu_pin_obj_t pin_PE00 = PIN(4, 0, NO_ADC);
+const mcu_pin_obj_t pin_PE01 = PIN(4, 1, NO_ADC);
diff --git a/ports/stm/peripherals/stm32f4/stm32f405xx/pins.h b/ports/stm/peripherals/stm32f4/stm32f405xx/pins.h
new file mode 100644
index 000000000..180f5c316
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f405xx/pins.h
@@ -0,0 +1,158 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F412ZG_PINS_H
+#define MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F412ZG_PINS_H
+
+//Pins in datasheet order: DocID028087 Rev 7 page 50. LQFP100 only
+//pg 50
+extern const mcu_pin_obj_t pin_PE02;
+extern const mcu_pin_obj_t pin_PE03;
+extern const mcu_pin_obj_t pin_PE04;
+extern const mcu_pin_obj_t pin_PE05;
+extern const mcu_pin_obj_t pin_PE06;
+extern const mcu_pin_obj_t pin_PC13;
+extern const mcu_pin_obj_t pin_PC14;
+//pg 51
+extern const mcu_pin_obj_t pin_PC15;
+extern const mcu_pin_obj_t pin_PF00;  // 144 only 
+extern const mcu_pin_obj_t pin_PF01;  // 144 only 
+extern const mcu_pin_obj_t pin_PF02;  // 144 only 
+extern const mcu_pin_obj_t pin_PF03;  // 144 only 
+extern const mcu_pin_obj_t pin_PF04;  // 144 only 
+extern const mcu_pin_obj_t pin_PF05;  // 144 only 
+extern const mcu_pin_obj_t pin_PF06;  // 144 only 
+extern const mcu_pin_obj_t pin_PF07;  // 144 only 
+extern const mcu_pin_obj_t pin_PF08;  // 144 only 
+extern const mcu_pin_obj_t pin_PF09;  // 144 only 
+extern const mcu_pin_obj_t pin_PF10; // 144 only 
+//pg 52
+extern const mcu_pin_obj_t pin_PC00;
+extern const mcu_pin_obj_t pin_PC01;
+extern const mcu_pin_obj_t pin_PC02;
+extern const mcu_pin_obj_t pin_PC03;
+extern const mcu_pin_obj_t pin_PA00;
+extern const mcu_pin_obj_t pin_PA01;
+extern const mcu_pin_obj_t pin_PA02;
+//pg 53
+extern const mcu_pin_obj_t pin_PA03;
+extern const mcu_pin_obj_t pin_PA04;
+extern const mcu_pin_obj_t pin_PA05;
+extern const mcu_pin_obj_t pin_PA06;
+extern const mcu_pin_obj_t pin_PA07;
+extern const mcu_pin_obj_t pin_PC04;
+//pg 54
+extern const mcu_pin_obj_t pin_PC05;
+extern const mcu_pin_obj_t pin_PB00;
+extern const mcu_pin_obj_t pin_PB01;
+extern const mcu_pin_obj_t pin_PB02;
+extern const mcu_pin_obj_t pin_PF11; // 144 only 
+extern const mcu_pin_obj_t pin_PF12; // 144 only 
+extern const mcu_pin_obj_t pin_PF13; // 144 only 
+extern const mcu_pin_obj_t pin_PF14; // 144 only 
+extern const mcu_pin_obj_t pin_PF15; // 144 only 
+extern const mcu_pin_obj_t pin_PG00;  // 144 only 
+extern const mcu_pin_obj_t pin_PG01;  // 144 only 
+//pg 55
+extern const mcu_pin_obj_t pin_PE07;
+extern const mcu_pin_obj_t pin_PE08;
+extern const mcu_pin_obj_t pin_PE09;
+extern const mcu_pin_obj_t pin_PE10;
+extern const mcu_pin_obj_t pin_PE11;
+extern const mcu_pin_obj_t pin_PE12;
+extern const mcu_pin_obj_t pin_PE13;
+extern const mcu_pin_obj_t pin_PE14;
+//pg 56
+extern const mcu_pin_obj_t pin_PE15;
+extern const mcu_pin_obj_t pin_PB10;
+extern const mcu_pin_obj_t pin_PB11; // 144 only
+extern const mcu_pin_obj_t pin_PB12;
+extern const mcu_pin_obj_t pin_PB13;
+//pg 57
+extern const mcu_pin_obj_t pin_PB14;
+extern const mcu_pin_obj_t pin_PB15;
+extern const mcu_pin_obj_t pin_PD08;
+extern const mcu_pin_obj_t pin_PD09;
+extern const mcu_pin_obj_t pin_PD10;
+extern const mcu_pin_obj_t pin_PD11;
+extern const mcu_pin_obj_t pin_PD12;
+//pg 58
+extern const mcu_pin_obj_t pin_PD13;
+extern const mcu_pin_obj_t pin_PD14;
+extern const mcu_pin_obj_t pin_PD15;
+extern const mcu_pin_obj_t pin_PG02;  // 144 only
+extern const mcu_pin_obj_t pin_PG03;  // 144 only
+extern const mcu_pin_obj_t pin_PG04;  // 144 only
+extern const mcu_pin_obj_t pin_PG05;  // 144 only
+extern const mcu_pin_obj_t pin_PG06;  // 144 only
+extern const mcu_pin_obj_t pin_PG07;  // 144 only
+extern const mcu_pin_obj_t pin_PG08;  // 144 only
+//pg 59
+extern const mcu_pin_obj_t pin_PC06;
+extern const mcu_pin_obj_t pin_PC07;
+extern const mcu_pin_obj_t pin_PC08;
+extern const mcu_pin_obj_t pin_PC09;
+extern const mcu_pin_obj_t pin_PA08;
+extern const mcu_pin_obj_t pin_PA09;
+extern const mcu_pin_obj_t pin_PA10;
+//pg 60
+extern const mcu_pin_obj_t pin_PA11;
+extern const mcu_pin_obj_t pin_PA12;
+extern const mcu_pin_obj_t pin_PA13;
+extern const mcu_pin_obj_t pin_PA14;
+extern const mcu_pin_obj_t pin_PA15;
+extern const mcu_pin_obj_t pin_PC10;
+extern const mcu_pin_obj_t pin_PC11;
+//pg 61
+extern const mcu_pin_obj_t pin_PC12;
+extern const mcu_pin_obj_t pin_PD00;
+extern const mcu_pin_obj_t pin_PD01;
+extern const mcu_pin_obj_t pin_PD02;
+extern const mcu_pin_obj_t pin_PD03;
+extern const mcu_pin_obj_t pin_PD04;
+extern const mcu_pin_obj_t pin_PD05;
+extern const mcu_pin_obj_t pin_PD06;
+extern const mcu_pin_obj_t pin_PD07;
+//pg 62
+extern const mcu_pin_obj_t pin_PG09;  // 144 only
+extern const mcu_pin_obj_t pin_PG10; // 144 only
+extern const mcu_pin_obj_t pin_PG11; // 144 only
+extern const mcu_pin_obj_t pin_PG12; // 144 only
+extern const mcu_pin_obj_t pin_PG13; // 144 only
+extern const mcu_pin_obj_t pin_PG14; // 144 only
+extern const mcu_pin_obj_t pin_PG15; // 144 only
+extern const mcu_pin_obj_t pin_PB03;
+extern const mcu_pin_obj_t pin_PB04;
+//pg 63
+extern const mcu_pin_obj_t pin_PB05;
+extern const mcu_pin_obj_t pin_PB06;
+extern const mcu_pin_obj_t pin_PB07;
+extern const mcu_pin_obj_t pin_PB08;
+extern const mcu_pin_obj_t pin_PB09;
+extern const mcu_pin_obj_t pin_PE00;
+extern const mcu_pin_obj_t pin_PE01;
+
+#endif // MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F412ZG_PINS_H
diff --git a/ports/stm/peripherals/stm32f4/stm32f407xx/clocks.c b/ports/stm/peripherals/stm32f4/stm32f407xx/clocks.c
new file mode 100644
index 000000000..2afca64e8
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f407xx/clocks.c
@@ -0,0 +1,64 @@
+
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "stm32f4xx_hal.h"
+#include "py/mpconfig.h"
+
+void stm32f4_peripherals_clocks_init(void) {
+    //TODO: All parameters must be moved to board level, due to relationship with HSE Osc. 
+
+    //System clock init
+    RCC_ClkInitTypeDef RCC_ClkInitStruct;
+    RCC_OscInitTypeDef RCC_OscInitStruct;
+
+    /* Enable Power Control clock */
+    __HAL_RCC_PWR_CLK_ENABLE();
+
+    /* The voltage scaling allows optimizing the power consumption when the device is
+     clocked below the maximum system frequency, to update the voltage scaling value
+     regarding system frequency refer to product datasheet.  */
+    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
+
+    /* Enable HSE Oscillator and activate PLL with HSE as source */
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+    RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+    RCC_OscInitStruct.PLL.PLLM = BOARD_OSC_DIV;
+    RCC_OscInitStruct.PLL.PLLN = 336;
+    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
+    RCC_OscInitStruct.PLL.PLLQ = 7;
+    HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+    /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
+     clocks dividers */
+    RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
+    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
+    HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);
+}
diff --git a/ports/stm/peripherals/stm32f4/stm32f407xx/gpio.c b/ports/stm/peripherals/stm32f4/stm32f407xx/gpio.c
new file mode 100644
index 000000000..d1eaa90d1
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f407xx/gpio.c
@@ -0,0 +1,60 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "stm32f4xx_hal.h"
+#include "stm32f4/gpio.h"
+#include "common-hal/microcontroller/Pin.h"
+
+void stm32f4_peripherals_gpio_init(void) {
+    //Enable all GPIO for now
+    __HAL_RCC_GPIOA_CLK_ENABLE();
+    __HAL_RCC_GPIOB_CLK_ENABLE();
+    __HAL_RCC_GPIOC_CLK_ENABLE();
+    __HAL_RCC_GPIOD_CLK_ENABLE();
+    __HAL_RCC_GPIOE_CLK_ENABLE();
+    __HAL_RCC_GPIOF_CLK_ENABLE();
+    __HAL_RCC_GPIOG_CLK_ENABLE();
+
+    //Never reset pins
+    never_reset_pin_number(2,13); //PC13 anti tamp
+    never_reset_pin_number(2,14); //PC14 OSC32_IN
+    never_reset_pin_number(2,15); //PC15 OSC32_OUT
+    never_reset_pin_number(0,13); //PA13 SWDIO
+    never_reset_pin_number(0,14); //PA14 SWCLK
+    // never_reset_pin_number(0,15); //PA15 JTDI
+    // never_reset_pin_number(1,3); //PB3 JTDO
+    // never_reset_pin_number(1,4); //PB4 JTRST
+
+    // Port H is not included in GPIO port array
+    // never_reset_pin_number(5,0); //PH0 JTDO   
+    // never_reset_pin_number(5,1); //PH1 JTRST
+}
+
+void stm32f4_peripherals_status_led(uint8_t led, uint8_t state) {
+
+}
+
+
diff --git a/ports/stm/peripherals/stm32f4/stm32f407xx/periph.c b/ports/stm/peripherals/stm32f4/stm32f407xx/periph.c
new file mode 100644
index 000000000..bc03f7c7b
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f407xx/periph.c
@@ -0,0 +1,194 @@
+ /*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/obj.h"
+#include "py/mphal.h"
+#include "stm32f4/pins.h"
+#include "stm32f4/periph.h"
+
+// I2C
+
+I2C_TypeDef * mcu_i2c_banks[3] = {I2C1, I2C2, I2C3};
+
+const mcu_i2c_sda_obj_t mcu_i2c_sda_list[4] = {
+    I2C_SDA(1, 4, &pin_PB07),
+    I2C_SDA(1, 4, &pin_PB09),
+    I2C_SDA(2, 4, &pin_PB11),
+    I2C_SDA(3, 4, &pin_PC09),
+};
+
+const mcu_i2c_scl_obj_t mcu_i2c_scl_list[4] = {
+    I2C_SCL(1, 4, &pin_PB06),
+    I2C_SCL(1, 4, &pin_PB08),
+    I2C_SCL(2, 4, &pin_PB10),
+    I2C_SCL(3, 4, &pin_PA08)
+};
+
+SPI_TypeDef * mcu_spi_banks[3] = {SPI1, SPI2, SPI3};
+
+const mcu_spi_sck_obj_t mcu_spi_sck_list[7] = {
+    SPI(1, 5, &pin_PA05),
+    SPI(1, 5, &pin_PB03),
+    SPI(2, 5, &pin_PB10),
+    SPI(2, 5, &pin_PB13),
+    SPI(2, 5, &pin_PC07),
+    SPI(3, 6, &pin_PB03),
+    SPI(3, 6, &pin_PC10),
+};
+
+const mcu_spi_mosi_obj_t mcu_spi_mosi_list[6] = {
+    SPI(1, 5, &pin_PA07),
+    SPI(1, 5, &pin_PB05),
+    SPI(2, 5, &pin_PB15),
+    SPI(2, 5, &pin_PC03),
+    SPI(3, 6, &pin_PB05),
+    SPI(3, 6, &pin_PC12),
+};
+
+const mcu_spi_miso_obj_t mcu_spi_miso_list[6] = {
+    SPI(1, 5, &pin_PA06),
+    SPI(1, 5, &pin_PB04),
+    SPI(2, 5, &pin_PB14),
+    SPI(2, 5, &pin_PC02),
+    SPI(3, 6, &pin_PB04),
+    SPI(3, 6, &pin_PC11),
+};
+
+const mcu_spi_nss_obj_t mcu_spi_nss_list[6] = {
+    SPI(1, 5, &pin_PA04),
+    SPI(1, 5, &pin_PA15),
+    SPI(2, 5, &pin_PB09),
+    SPI(2, 5, &pin_PB12),
+    SPI(3, 6, &pin_PA04),
+    SPI(3, 6, &pin_PA15),
+};
+
+USART_TypeDef * mcu_uart_banks[MAX_UART] = {USART1, USART2, USART3, UART4, UART5, USART6};
+bool mcu_uart_has_usart[MAX_UART] = {true, true, true, false, false, true};
+
+const mcu_uart_tx_obj_t mcu_uart_tx_list[12] = {
+    UART(4, 8, &pin_PA00),
+    UART(2, 7, &pin_PA02),
+    UART(1, 7, &pin_PA09),
+    UART(1, 7, &pin_PB06),
+    UART(3, 7, &pin_PB10),
+    UART(6, 8, &pin_PC06),
+    UART(3, 7, &pin_PC10),
+    UART(4, 8, &pin_PC10),
+    UART(5, 8, &pin_PC12),
+    UART(2, 7, &pin_PD05),
+    UART(3, 7, &pin_PD08),
+    UART(6, 8, &pin_PG14),
+};
+
+const mcu_uart_rx_obj_t mcu_uart_rx_list[12] = {
+    UART(4, 8, &pin_PA01),
+    UART(2, 7, &pin_PA03),
+    UART(1, 7, &pin_PA10),
+    UART(1, 7, &pin_PB07),
+    UART(3, 7, &pin_PB11),
+    UART(6, 8, &pin_PC07),
+    UART(3, 7, &pin_PC11),
+    UART(4, 8, &pin_PC11),
+    UART(5, 8, &pin_PD02),
+    UART(2, 7, &pin_PD06),
+    UART(3, 7, &pin_PD09),
+    UART(6, 8, &pin_PG09),
+};
+
+//Timers
+//TIM6 and TIM7 are basic timers that are only used by DAC, and don't have pins
+TIM_TypeDef * mcu_tim_banks[14] = {TIM1, TIM2, TIM3, TIM4, TIM5, NULL, NULL, TIM8, TIM9, TIM10,
+                                    TIM11, TIM12, TIM13, TIM14};
+
+const mcu_tim_pin_obj_t mcu_tim_pin_list[56] = {
+    TIM(2,1,1,&pin_PA00),
+    TIM(5,2,1,&pin_PA00),
+    TIM(2,1,2,&pin_PA01),
+    TIM(5,2,2,&pin_PA01),
+    TIM(2,1,3,&pin_PA02),
+    TIM(5,2,3,&pin_PA02),
+    TIM(2,1,4,&pin_PA03),
+    TIM(5,2,4,&pin_PA03),
+    TIM(9,3,1,&pin_PA02),
+    TIM(9,3,2,&pin_PA03),
+    TIM(3,2,1,&pin_PA06),
+    TIM(13,9,1,&pin_PA06),
+    TIM(3,2,2,&pin_PA07),
+    TIM(14,9,1,&pin_PA07),
+    TIM(1,1,1,&pin_PA08),
+    TIM(1,1,2,&pin_PA09),
+    TIM(1,1,3,&pin_PA10),
+    TIM(1,1,4,&pin_PA11),
+    TIM(2,1,1,&pin_PA15),
+    TIM(3,2,3,&pin_PB00),
+    TIM(3,2,4,&pin_PB01),
+    TIM(2,1,2,&pin_PB03),
+    TIM(3,2,1,&pin_PB04),
+    TIM(3,2,2,&pin_PB05),
+    TIM(4,2,1,&pin_PB06),
+    TIM(4,2,2,&pin_PB07),
+    TIM(4,2,3,&pin_PB08),
+    TIM(10,2,1,&pin_PB08),
+    TIM(4,2,4,&pin_PB09),
+    TIM(11,2,1,&pin_PB09),
+    TIM(2,1,3,&pin_PB10),
+    TIM(2,1,4,&pin_PB11),
+    TIM(12,9,1,&pin_PB14),
+    TIM(12,9,2,&pin_PB15),
+    TIM(3,2,1,&pin_PC06),
+    TIM(3,2,2,&pin_PC07),
+    TIM(3,2,3,&pin_PC08),
+    TIM(3,2,4,&pin_PC09),
+    TIM(8,3,1,&pin_PC06),
+    TIM(8,3,2,&pin_PC07),
+    TIM(8,3,3,&pin_PC08),
+    TIM(8,3,4,&pin_PC09),
+    TIM(4,2,1,&pin_PD12),
+    TIM(4,2,2,&pin_PD13),
+    TIM(4,2,3,&pin_PD14),
+    TIM(4,2,4,&pin_PD15),
+    TIM(9,3,1,&pin_PE05),
+    TIM(9,3,2,&pin_PE06),
+    TIM(1,1,1,&pin_PE09),
+    TIM(1,1,2,&pin_PE11),
+    TIM(1,1,3,&pin_PE13),
+    TIM(1,1,4,&pin_PE14),
+    TIM(10,3,1,&pin_PF06),
+    TIM(11,3,1,&pin_PF07),
+    TIM(13,9,1,&pin_PF08),
+    TIM(14,9,1,&pin_PF09),
+    // TIM(12,9,1,&pin_PH06), //TODO: include these when pin map is expanded
+    // TIM(12,9,2,&pin_PH09),
+    // TIM(5,2,1,&pin_PH10),
+    // TIM(5,2,2,&pin_PH11),
+    // TIM(5,2,3,&pin_PH12),
+    // TIM(5,2,4,&pin_PI00),
+    // TIM(8,3,4,&pin_PI02),
+    // TIM(8,3,1,&pin_PI05),
+    // TIM(8,3,2,&pin_PI06),
+    // TIM(8,3,3,&pin_PI07),
+};
diff --git a/ports/stm/peripherals/stm32f4/stm32f407xx/periph.h b/ports/stm/peripherals/stm32f4/stm32f407xx/periph.h
new file mode 100644
index 000000000..e87e79857
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f407xx/periph.h
@@ -0,0 +1,57 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F405XX_PERIPH_H
+#define MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F405XX_PERIPH_H
+
+//I2C
+extern I2C_TypeDef * mcu_i2c_banks[3];
+
+extern const mcu_i2c_sda_obj_t mcu_i2c_sda_list[4];
+extern const mcu_i2c_scl_obj_t mcu_i2c_scl_list[4];
+
+//SPI
+extern SPI_TypeDef * mcu_spi_banks[3];
+
+extern const mcu_spi_sck_obj_t mcu_spi_sck_list[7];
+extern const mcu_spi_mosi_obj_t mcu_spi_mosi_list[6];
+extern const mcu_spi_miso_obj_t mcu_spi_miso_list[6];
+extern const mcu_spi_nss_obj_t mcu_spi_nss_list[6];
+
+//UART
+extern USART_TypeDef * mcu_uart_banks[MAX_UART];
+extern bool mcu_uart_has_usart[MAX_UART];
+
+extern const mcu_uart_tx_obj_t mcu_uart_tx_list[12];
+extern const mcu_uart_rx_obj_t mcu_uart_rx_list[12];
+
+//Timers
+#define TIM_BANK_ARRAY_LEN 14
+#define TIM_PIN_ARRAY_LEN 56
+TIM_TypeDef * mcu_tim_banks[TIM_BANK_ARRAY_LEN];
+const mcu_tim_pin_obj_t mcu_tim_pin_list[TIM_PIN_ARRAY_LEN];
+
+#endif // MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F405XX_PERIPH_H
\ No newline at end of file
diff --git a/ports/stm/peripherals/stm32f4/stm32f407xx/pins.c b/ports/stm/peripherals/stm32f4/stm32f407xx/pins.c
new file mode 100644
index 000000000..86445fe14
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f407xx/pins.c
@@ -0,0 +1,161 @@
+ /*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/obj.h"
+#include "py/mphal.h"
+#include "stm32f4/pins.h"
+
+const mcu_pin_obj_t pin_PE02 = PIN(4, 2, NO_ADC);
+const mcu_pin_obj_t pin_PE03 = PIN(4, 3, NO_ADC);
+const mcu_pin_obj_t pin_PE04 = PIN(4, 4, NO_ADC);
+const mcu_pin_obj_t pin_PE05 = PIN(4, 5, NO_ADC);
+const mcu_pin_obj_t pin_PE06 = PIN(4, 6, NO_ADC);
+
+const mcu_pin_obj_t pin_PC13 = PIN(2, 13, NO_ADC); //anti-tamp
+const mcu_pin_obj_t pin_PC14 = PIN(2, 14, NO_ADC); //OSC32_IN
+const mcu_pin_obj_t pin_PC15 = PIN(2, 15, NO_ADC); //OSC32_OUT
+
+const mcu_pin_obj_t pin_PF00 = PIN(5, 0, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PF01 = PIN(5, 1, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PF02 = PIN(5, 2, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PF03 = PIN(5, 3, ADC_INPUT(ADC_3,9));   // 144 only 
+const mcu_pin_obj_t pin_PF04 = PIN(5, 4, ADC_INPUT(ADC_3,14));   // 144 only 
+const mcu_pin_obj_t pin_PF05 = PIN(5, 5, ADC_INPUT(ADC_3,15));   // 144 only 
+const mcu_pin_obj_t pin_PF06 = PIN(5, 6, ADC_INPUT(ADC_3,4));   // 144 only 
+const mcu_pin_obj_t pin_PF07 = PIN(5, 7, ADC_INPUT(ADC_3,5));   // 144 only 
+const mcu_pin_obj_t pin_PF08 = PIN(5, 8, ADC_INPUT(ADC_3,6));   // 144 only 
+const mcu_pin_obj_t pin_PF09 = PIN(5, 9, ADC_INPUT(ADC_3,7));   // 144 only 
+const mcu_pin_obj_t pin_PF10 = PIN(5, 10, ADC_INPUT(ADC_3,8)); // 144 only 
+
+const mcu_pin_obj_t pin_PC00 = PIN(2, 0, ADC_INPUT(ADC_123,10));
+const mcu_pin_obj_t pin_PC01 = PIN(2, 1, ADC_INPUT(ADC_123,11));
+const mcu_pin_obj_t pin_PC02 = PIN(2, 2, ADC_INPUT(ADC_123,12));
+const mcu_pin_obj_t pin_PC03 = PIN(2, 3, ADC_INPUT(ADC_123,13));
+
+const mcu_pin_obj_t pin_PA00 = PIN(0, 0, ADC_INPUT(ADC_123,0));
+const mcu_pin_obj_t pin_PA01 = PIN(0, 1, ADC_INPUT(ADC_123,1));
+const mcu_pin_obj_t pin_PA02 = PIN(0, 2, ADC_INPUT(ADC_123,2));
+const mcu_pin_obj_t pin_PA03 = PIN(0, 3, ADC_INPUT(ADC_123,3));
+const mcu_pin_obj_t pin_PA04 = PIN(0, 4, ADC_INPUT(ADC_12,4));
+const mcu_pin_obj_t pin_PA05 = PIN(0, 5, ADC_INPUT(ADC_12,5));
+const mcu_pin_obj_t pin_PA06 = PIN(0, 6, ADC_INPUT(ADC_12,6));
+const mcu_pin_obj_t pin_PA07 = PIN(0, 7, ADC_INPUT(ADC_12,7));
+
+const mcu_pin_obj_t pin_PC04 = PIN(2, 4, ADC_INPUT(ADC_12,14));
+const mcu_pin_obj_t pin_PC05 = PIN(2, 5, ADC_INPUT(ADC_12,15));
+
+const mcu_pin_obj_t pin_PB00 = PIN(1, 0, ADC_INPUT(ADC_12,8));
+const mcu_pin_obj_t pin_PB01 = PIN(1, 1, ADC_INPUT(ADC_12,9));
+const mcu_pin_obj_t pin_PB02 = PIN(1, 2, NO_ADC); //BOOT1
+
+const mcu_pin_obj_t pin_PF11 = PIN(5, 11, NO_ADC); // 144 only 
+const mcu_pin_obj_t pin_PF12 = PIN(5, 12, NO_ADC); // 144 only 
+const mcu_pin_obj_t pin_PF13 = PIN(5, 13, NO_ADC); // 144 only 
+const mcu_pin_obj_t pin_PF14 = PIN(5, 14, NO_ADC); // 144 only 
+const mcu_pin_obj_t pin_PF15 = PIN(5, 15, NO_ADC); // 144 only 
+
+const mcu_pin_obj_t pin_PG00 = PIN(6, 0, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PG01 = PIN(6, 1, NO_ADC);   // 144 only 
+
+const mcu_pin_obj_t pin_PE07 = PIN(4, 7, NO_ADC);
+const mcu_pin_obj_t pin_PE08 = PIN(4, 8, NO_ADC);
+const mcu_pin_obj_t pin_PE09 = PIN(4, 9, NO_ADC);
+const mcu_pin_obj_t pin_PE10 = PIN(4, 10, NO_ADC);
+const mcu_pin_obj_t pin_PE11 = PIN(4, 11, NO_ADC);
+const mcu_pin_obj_t pin_PE12 = PIN(4, 12, NO_ADC);
+const mcu_pin_obj_t pin_PE13 = PIN(4, 13, NO_ADC);
+const mcu_pin_obj_t pin_PE14 = PIN(4, 14, NO_ADC);
+const mcu_pin_obj_t pin_PE15 = PIN(4, 15, NO_ADC);
+
+const mcu_pin_obj_t pin_PB10 = PIN(1, 10, NO_ADC);
+const mcu_pin_obj_t pin_PB11 = PIN(1, 11, NO_ADC); 
+const mcu_pin_obj_t pin_PB12 = PIN(1, 12, NO_ADC);
+const mcu_pin_obj_t pin_PB13 = PIN(1, 13, NO_ADC);
+const mcu_pin_obj_t pin_PB14 = PIN(1, 14, NO_ADC);
+const mcu_pin_obj_t pin_PB15 = PIN(1, 15, NO_ADC);
+
+const mcu_pin_obj_t pin_PD08 = PIN(3, 8, NO_ADC);
+const mcu_pin_obj_t pin_PD09 = PIN(3, 9, NO_ADC);
+const mcu_pin_obj_t pin_PD10 = PIN(3, 10, NO_ADC);
+const mcu_pin_obj_t pin_PD11 = PIN(3, 11, NO_ADC);
+const mcu_pin_obj_t pin_PD12 = PIN(3, 12, NO_ADC);
+const mcu_pin_obj_t pin_PD13 = PIN(3, 13, NO_ADC);
+const mcu_pin_obj_t pin_PD14 = PIN(3, 14, NO_ADC);
+const mcu_pin_obj_t pin_PD15 = PIN(3, 15, NO_ADC);
+
+const mcu_pin_obj_t pin_PG02 = PIN(6, 2, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG03 = PIN(6, 3, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG04 = PIN(6, 4, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG05 = PIN(6, 5, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG06 = PIN(6, 6, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG07 = PIN(6, 7, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG08 = PIN(6, 8, NO_ADC);  // 144 only
+
+const mcu_pin_obj_t pin_PC06 = PIN(2, 6, NO_ADC);
+const mcu_pin_obj_t pin_PC07 = PIN(2, 7, NO_ADC);
+const mcu_pin_obj_t pin_PC08 = PIN(2, 8, NO_ADC);
+const mcu_pin_obj_t pin_PC09 = PIN(2, 9, NO_ADC);
+
+const mcu_pin_obj_t pin_PA08 = PIN(0, 8, NO_ADC);
+const mcu_pin_obj_t pin_PA09 = PIN(0, 9, NO_ADC);
+const mcu_pin_obj_t pin_PA10 = PIN(0, 10, NO_ADC);
+const mcu_pin_obj_t pin_PA11 = PIN(0, 11, NO_ADC);
+const mcu_pin_obj_t pin_PA12 = PIN(0, 12, NO_ADC);
+const mcu_pin_obj_t pin_PA13 = PIN(0, 13, NO_ADC);
+const mcu_pin_obj_t pin_PA14 = PIN(0, 14, NO_ADC);
+const mcu_pin_obj_t pin_PA15 = PIN(0, 15, NO_ADC);
+
+const mcu_pin_obj_t pin_PC10 = PIN(2, 10, NO_ADC);
+const mcu_pin_obj_t pin_PC11 = PIN(2, 11, NO_ADC);
+const mcu_pin_obj_t pin_PC12 = PIN(2, 12, NO_ADC);
+
+const mcu_pin_obj_t pin_PD00 = PIN(3, 0, NO_ADC);
+const mcu_pin_obj_t pin_PD01 = PIN(3, 1, NO_ADC);
+const mcu_pin_obj_t pin_PD02 = PIN(3, 2, NO_ADC);
+const mcu_pin_obj_t pin_PD03 = PIN(3, 3, NO_ADC);
+const mcu_pin_obj_t pin_PD04 = PIN(3, 4, NO_ADC);
+const mcu_pin_obj_t pin_PD05 = PIN(3, 5, NO_ADC);
+const mcu_pin_obj_t pin_PD06 = PIN(3, 6, NO_ADC);
+const mcu_pin_obj_t pin_PD07 = PIN(3, 7, NO_ADC);
+
+const mcu_pin_obj_t pin_PG09 = PIN(6, 9, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG10 = PIN(6, 10, NO_ADC); // 144 only
+const mcu_pin_obj_t pin_PG11 = PIN(6, 11, NO_ADC); // 144 only
+const mcu_pin_obj_t pin_PG12 = PIN(6, 12, NO_ADC); // 144 only
+const mcu_pin_obj_t pin_PG13 = PIN(6, 13, NO_ADC); // 144 only
+const mcu_pin_obj_t pin_PG14 = PIN(6, 14, NO_ADC); // 144 only
+const mcu_pin_obj_t pin_PG15 = PIN(6, 15, NO_ADC); // 144 only
+
+const mcu_pin_obj_t pin_PB03 = PIN(1, 3, NO_ADC);
+const mcu_pin_obj_t pin_PB04 = PIN(1, 4, NO_ADC);
+const mcu_pin_obj_t pin_PB05 = PIN(1, 5, NO_ADC);
+const mcu_pin_obj_t pin_PB06 = PIN(1, 6, NO_ADC);
+const mcu_pin_obj_t pin_PB07 = PIN(1, 7, NO_ADC);
+const mcu_pin_obj_t pin_PB08 = PIN(1, 8, NO_ADC);
+const mcu_pin_obj_t pin_PB09 = PIN(1, 9, NO_ADC);
+
+const mcu_pin_obj_t pin_PE00 = PIN(4, 0, NO_ADC);
+const mcu_pin_obj_t pin_PE01 = PIN(4, 1, NO_ADC);
diff --git a/ports/stm/peripherals/stm32f4/stm32f407xx/pins.h b/ports/stm/peripherals/stm32f4/stm32f407xx/pins.h
new file mode 100644
index 000000000..180f5c316
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f407xx/pins.h
@@ -0,0 +1,158 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F412ZG_PINS_H
+#define MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F412ZG_PINS_H
+
+//Pins in datasheet order: DocID028087 Rev 7 page 50. LQFP100 only
+//pg 50
+extern const mcu_pin_obj_t pin_PE02;
+extern const mcu_pin_obj_t pin_PE03;
+extern const mcu_pin_obj_t pin_PE04;
+extern const mcu_pin_obj_t pin_PE05;
+extern const mcu_pin_obj_t pin_PE06;
+extern const mcu_pin_obj_t pin_PC13;
+extern const mcu_pin_obj_t pin_PC14;
+//pg 51
+extern const mcu_pin_obj_t pin_PC15;
+extern const mcu_pin_obj_t pin_PF00;  // 144 only 
+extern const mcu_pin_obj_t pin_PF01;  // 144 only 
+extern const mcu_pin_obj_t pin_PF02;  // 144 only 
+extern const mcu_pin_obj_t pin_PF03;  // 144 only 
+extern const mcu_pin_obj_t pin_PF04;  // 144 only 
+extern const mcu_pin_obj_t pin_PF05;  // 144 only 
+extern const mcu_pin_obj_t pin_PF06;  // 144 only 
+extern const mcu_pin_obj_t pin_PF07;  // 144 only 
+extern const mcu_pin_obj_t pin_PF08;  // 144 only 
+extern const mcu_pin_obj_t pin_PF09;  // 144 only 
+extern const mcu_pin_obj_t pin_PF10; // 144 only 
+//pg 52
+extern const mcu_pin_obj_t pin_PC00;
+extern const mcu_pin_obj_t pin_PC01;
+extern const mcu_pin_obj_t pin_PC02;
+extern const mcu_pin_obj_t pin_PC03;
+extern const mcu_pin_obj_t pin_PA00;
+extern const mcu_pin_obj_t pin_PA01;
+extern const mcu_pin_obj_t pin_PA02;
+//pg 53
+extern const mcu_pin_obj_t pin_PA03;
+extern const mcu_pin_obj_t pin_PA04;
+extern const mcu_pin_obj_t pin_PA05;
+extern const mcu_pin_obj_t pin_PA06;
+extern const mcu_pin_obj_t pin_PA07;
+extern const mcu_pin_obj_t pin_PC04;
+//pg 54
+extern const mcu_pin_obj_t pin_PC05;
+extern const mcu_pin_obj_t pin_PB00;
+extern const mcu_pin_obj_t pin_PB01;
+extern const mcu_pin_obj_t pin_PB02;
+extern const mcu_pin_obj_t pin_PF11; // 144 only 
+extern const mcu_pin_obj_t pin_PF12; // 144 only 
+extern const mcu_pin_obj_t pin_PF13; // 144 only 
+extern const mcu_pin_obj_t pin_PF14; // 144 only 
+extern const mcu_pin_obj_t pin_PF15; // 144 only 
+extern const mcu_pin_obj_t pin_PG00;  // 144 only 
+extern const mcu_pin_obj_t pin_PG01;  // 144 only 
+//pg 55
+extern const mcu_pin_obj_t pin_PE07;
+extern const mcu_pin_obj_t pin_PE08;
+extern const mcu_pin_obj_t pin_PE09;
+extern const mcu_pin_obj_t pin_PE10;
+extern const mcu_pin_obj_t pin_PE11;
+extern const mcu_pin_obj_t pin_PE12;
+extern const mcu_pin_obj_t pin_PE13;
+extern const mcu_pin_obj_t pin_PE14;
+//pg 56
+extern const mcu_pin_obj_t pin_PE15;
+extern const mcu_pin_obj_t pin_PB10;
+extern const mcu_pin_obj_t pin_PB11; // 144 only
+extern const mcu_pin_obj_t pin_PB12;
+extern const mcu_pin_obj_t pin_PB13;
+//pg 57
+extern const mcu_pin_obj_t pin_PB14;
+extern const mcu_pin_obj_t pin_PB15;
+extern const mcu_pin_obj_t pin_PD08;
+extern const mcu_pin_obj_t pin_PD09;
+extern const mcu_pin_obj_t pin_PD10;
+extern const mcu_pin_obj_t pin_PD11;
+extern const mcu_pin_obj_t pin_PD12;
+//pg 58
+extern const mcu_pin_obj_t pin_PD13;
+extern const mcu_pin_obj_t pin_PD14;
+extern const mcu_pin_obj_t pin_PD15;
+extern const mcu_pin_obj_t pin_PG02;  // 144 only
+extern const mcu_pin_obj_t pin_PG03;  // 144 only
+extern const mcu_pin_obj_t pin_PG04;  // 144 only
+extern const mcu_pin_obj_t pin_PG05;  // 144 only
+extern const mcu_pin_obj_t pin_PG06;  // 144 only
+extern const mcu_pin_obj_t pin_PG07;  // 144 only
+extern const mcu_pin_obj_t pin_PG08;  // 144 only
+//pg 59
+extern const mcu_pin_obj_t pin_PC06;
+extern const mcu_pin_obj_t pin_PC07;
+extern const mcu_pin_obj_t pin_PC08;
+extern const mcu_pin_obj_t pin_PC09;
+extern const mcu_pin_obj_t pin_PA08;
+extern const mcu_pin_obj_t pin_PA09;
+extern const mcu_pin_obj_t pin_PA10;
+//pg 60
+extern const mcu_pin_obj_t pin_PA11;
+extern const mcu_pin_obj_t pin_PA12;
+extern const mcu_pin_obj_t pin_PA13;
+extern const mcu_pin_obj_t pin_PA14;
+extern const mcu_pin_obj_t pin_PA15;
+extern const mcu_pin_obj_t pin_PC10;
+extern const mcu_pin_obj_t pin_PC11;
+//pg 61
+extern const mcu_pin_obj_t pin_PC12;
+extern const mcu_pin_obj_t pin_PD00;
+extern const mcu_pin_obj_t pin_PD01;
+extern const mcu_pin_obj_t pin_PD02;
+extern const mcu_pin_obj_t pin_PD03;
+extern const mcu_pin_obj_t pin_PD04;
+extern const mcu_pin_obj_t pin_PD05;
+extern const mcu_pin_obj_t pin_PD06;
+extern const mcu_pin_obj_t pin_PD07;
+//pg 62
+extern const mcu_pin_obj_t pin_PG09;  // 144 only
+extern const mcu_pin_obj_t pin_PG10; // 144 only
+extern const mcu_pin_obj_t pin_PG11; // 144 only
+extern const mcu_pin_obj_t pin_PG12; // 144 only
+extern const mcu_pin_obj_t pin_PG13; // 144 only
+extern const mcu_pin_obj_t pin_PG14; // 144 only
+extern const mcu_pin_obj_t pin_PG15; // 144 only
+extern const mcu_pin_obj_t pin_PB03;
+extern const mcu_pin_obj_t pin_PB04;
+//pg 63
+extern const mcu_pin_obj_t pin_PB05;
+extern const mcu_pin_obj_t pin_PB06;
+extern const mcu_pin_obj_t pin_PB07;
+extern const mcu_pin_obj_t pin_PB08;
+extern const mcu_pin_obj_t pin_PB09;
+extern const mcu_pin_obj_t pin_PE00;
+extern const mcu_pin_obj_t pin_PE01;
+
+#endif // MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F412ZG_PINS_H
diff --git a/ports/stm/peripherals/stm32f4/stm32f411xe/clocks.c b/ports/stm/peripherals/stm32f4/stm32f411xe/clocks.c
new file mode 100644
index 000000000..53810af26
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f411xe/clocks.c
@@ -0,0 +1,62 @@
+
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "stm32f4xx_hal.h"
+#include "py/mpconfig.h"
+
+void stm32f4_peripherals_clocks_init(void) {
+    //System clock init
+    RCC_ClkInitTypeDef RCC_ClkInitStruct;
+    RCC_OscInitTypeDef RCC_OscInitStruct;
+
+    /* Enable Power Control clock */
+    __HAL_RCC_PWR_CLK_ENABLE();
+
+    /* The voltage scaling allows optimizing the power consumption when the device is
+       clocked below the maximum system frequency, to update the voltage scaling value
+       regarding system frequency refer to product datasheet.  */
+    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
+
+    /* Enable HSE Oscillator and activate PLL with HSE as source */
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+    RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+    RCC_OscInitStruct.PLL.PLLM = BOARD_OSC_DIV;
+    RCC_OscInitStruct.PLL.PLLN = 336;
+    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
+    RCC_OscInitStruct.PLL.PLLQ = 7;
+    HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+    /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
+       clocks dividers */
+    RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
+    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
+    HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3);
+}
diff --git a/ports/stm/peripherals/stm32f4/stm32f411xe/gpio.c b/ports/stm/peripherals/stm32f4/stm32f411xe/gpio.c
new file mode 100644
index 000000000..aee0bd5eb
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f411xe/gpio.c
@@ -0,0 +1,59 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "stm32f4xx_hal.h"
+#include "stm32f4/gpio.h"
+#include "py/mpconfig.h"
+#include "common-hal/microcontroller/Pin.h"
+
+void stm32f4_peripherals_gpio_init(void) {
+    //* GPIO Ports Clock Enable */
+    __HAL_RCC_GPIOE_CLK_ENABLE();
+    __HAL_RCC_GPIOC_CLK_ENABLE();
+    __HAL_RCC_GPIOH_CLK_ENABLE();
+    __HAL_RCC_GPIOA_CLK_ENABLE();
+    __HAL_RCC_GPIOB_CLK_ENABLE();
+    __HAL_RCC_GPIOD_CLK_ENABLE();
+
+    //Never reset pins
+    never_reset_pin_number(2,14); //PC14 OSC32_IN
+    never_reset_pin_number(2,15); //PC15 OSC32_OUT
+
+    #if !(BOARD_OVERWRITE_SWD) 
+    never_reset_pin_number(0,13); //PA13 SWDIO
+    never_reset_pin_number(0,14); //PA14 SWCLK
+    #endif
+
+    // Port H is not included in GPIO port array
+    // never_reset_pin_number(5,0); //PH0 JTDO   
+    // never_reset_pin_number(5,1); //PH1 JTRST
+}
+
+//LEDs are inverted on F411 DISCO
+void stm32f4_peripherals_status_led(uint8_t led, uint8_t state) {
+}
+
+
diff --git a/ports/stm/peripherals/stm32f4/stm32f411xe/periph.c b/ports/stm/peripherals/stm32f4/stm32f411xe/periph.c
new file mode 100644
index 000000000..b7d9edf4f
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f411xe/periph.c
@@ -0,0 +1,194 @@
+ /*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/obj.h"
+#include "py/mphal.h"
+#include "stm32f4/pins.h"
+#include "stm32f4/periph.h"
+
+// I2C
+
+I2C_TypeDef * mcu_i2c_banks[3] = {I2C1, I2C2, I2C3};
+
+const mcu_i2c_sda_obj_t mcu_i2c_sda_list[7] = {
+    I2C_SDA(1, 4, &pin_PB07),
+    I2C_SDA(1, 4, &pin_PB09),
+    I2C_SDA(2, 9, &pin_PB09),
+    I2C_SDA(2, 9, &pin_PB03),
+    I2C_SDA(3, 4, &pin_PC09),
+    I2C_SDA(3, 9, &pin_PB04),
+    I2C_SDA(3, 9, &pin_PB08)
+};
+
+const mcu_i2c_scl_obj_t mcu_i2c_scl_list[4] = {
+    I2C_SCL(1, 4, &pin_PB06),
+    I2C_SCL(1, 4, &pin_PB08),
+    I2C_SCL(2, 4, &pin_PB10),
+    I2C_SCL(3, 4, &pin_PA08)
+};
+
+// SPI
+
+SPI_TypeDef * mcu_spi_banks[5] = {SPI1, SPI2, SPI3, SPI4, SPI5};
+
+const mcu_spi_sck_obj_t mcu_spi_sck_list[15] = {
+    SPI(1, 5, &pin_PA05),
+    SPI(1, 5, &pin_PB03),
+    SPI(2, 5, &pin_PB10),
+    SPI(2, 5, &pin_PB13),
+    SPI(2, 5, &pin_PC07),
+    SPI(2, 5, &pin_PD03),
+    SPI(3, 6, &pin_PB03),
+    SPI(3, 7, &pin_PB12),
+    SPI(3, 6, &pin_PC10),
+    SPI(4, 6, &pin_PB13),
+    SPI(4, 5, &pin_PE02),
+    SPI(4, 5, &pin_PE12),
+    SPI(5, 6, &pin_PB00),
+    SPI(5, 6, &pin_PE02),
+    SPI(5, 6, &pin_PE12)
+};
+
+const mcu_spi_mosi_obj_t mcu_spi_mosi_list[14] = {
+    SPI(1, 5, &pin_PA07),
+    SPI(1, 5, &pin_PB05),
+    SPI(2, 5, &pin_PB15),
+    SPI(2, 5, &pin_PC03),
+    SPI(3, 6, &pin_PB05),
+    SPI(3, 6, &pin_PC12),
+    SPI(3, 5, &pin_PD06),
+    SPI(4, 5, &pin_PA01),
+    SPI(4, 5, &pin_PE06),
+    SPI(4, 5, &pin_PE14),
+    SPI(5, 6, &pin_PA10),
+    SPI(5, 6, &pin_PB08),
+    SPI(5, 6, &pin_PE06),
+    SPI(5, 6, &pin_PE14)
+};
+
+const mcu_spi_miso_obj_t mcu_spi_miso_list[12] = {
+    SPI(1, 5, &pin_PA06),
+    SPI(1, 5, &pin_PB04),
+    SPI(2, 5, &pin_PB14),
+    SPI(2, 5, &pin_PC02),
+    SPI(3, 6, &pin_PB04),
+    SPI(3, 6, &pin_PC11),
+    SPI(4, 6, &pin_PA11),
+    SPI(4, 5, &pin_PE05),
+    SPI(4, 5, &pin_PE13),
+    SPI(5, 6, &pin_PA12),
+    SPI(5, 6, &pin_PE05),
+    SPI(5, 6, &pin_PE13)
+};
+
+const mcu_spi_nss_obj_t mcu_spi_nss_list[12] = {
+    SPI(1, 5, &pin_PA04),
+    SPI(1, 5, &pin_PA15),
+    SPI(2, 5, &pin_PB09),
+    SPI(2, 5, &pin_PB12),
+    SPI(3, 6, &pin_PA04),
+    SPI(3, 6, &pin_PA15),
+    SPI(4, 6, &pin_PB12),
+    SPI(4, 5, &pin_PE04),
+    SPI(4, 5, &pin_PE11),
+    SPI(5, 6, &pin_PB01),
+    SPI(5, 6, &pin_PE04),
+    SPI(5, 6, &pin_PE11)
+};
+
+USART_TypeDef * mcu_uart_banks[MAX_UART] = {USART1, USART2, NULL, NULL, NULL, USART6};
+bool mcu_uart_has_usart[MAX_UART] = {true, true, false, false, false, true};
+
+const mcu_uart_tx_obj_t mcu_uart_tx_list[7] = {
+    UART(2, 7, &pin_PA02),
+    UART(1, 7, &pin_PA09),
+    UART(1, 7, &pin_PA15),
+    UART(6, 8, &pin_PA11),
+    UART(1, 7, &pin_PB06),
+    UART(6, 8, &pin_PC06),
+    UART(2, 7, &pin_PD05),
+};
+
+const mcu_uart_rx_obj_t mcu_uart_rx_list[7] = {
+    UART(2, 7, &pin_PA03),
+    UART(1, 7, &pin_PA10),
+    UART(6, 8, &pin_PA12),
+    UART(1, 7, &pin_PB03),
+    UART(1, 7, &pin_PB07),
+    UART(6, 8, &pin_PC07),
+    UART(2, 7, &pin_PD06),
+};
+
+//Timers
+//TIM6 and TIM7 are basic timers that are only used by DAC, and don't have pins
+TIM_TypeDef * mcu_tim_banks[14] = {TIM1, TIM2, TIM3, TIM4, TIM5, NULL, NULL, NULL, TIM9, TIM10,
+                                    TIM11, NULL, NULL, NULL};
+
+const mcu_tim_pin_obj_t mcu_tim_pin_list[44] = {
+    TIM(2,1,1,&pin_PA00),
+    TIM(5,2,1,&pin_PA00),
+    TIM(2,1,2,&pin_PA01),
+    TIM(5,2,2,&pin_PA01),
+    TIM(2,1,3,&pin_PA02),
+    TIM(5,2,3,&pin_PA02),
+    TIM(2,1,4,&pin_PA03),
+    TIM(5,2,4,&pin_PA03),
+    TIM(9,3,1,&pin_PA02),
+    TIM(9,3,2,&pin_PA03),
+    TIM(3,2,1,&pin_PA06),
+    TIM(3,2,2,&pin_PA07),
+    TIM(1,1,1,&pin_PA08),
+    TIM(1,1,2,&pin_PA09),
+    TIM(1,1,3,&pin_PA10),
+    TIM(1,1,4,&pin_PA11),
+    TIM(2,1,1,&pin_PA15),
+    TIM(3,2,3,&pin_PB00),
+    TIM(3,2,4,&pin_PB01),
+    TIM(2,1,2,&pin_PB03),
+    TIM(3,2,1,&pin_PB04),
+    TIM(3,2,2,&pin_PB05),
+    TIM(4,2,1,&pin_PB06),
+    TIM(4,2,2,&pin_PB07),
+    TIM(4,2,3,&pin_PB08),
+    TIM(10,2,1,&pin_PB08),
+    TIM(4,2,4,&pin_PB09),
+    TIM(11,2,1,&pin_PB09),
+    TIM(2,1,3,&pin_PB10),
+    TIM(3,2,1,&pin_PC06),
+    TIM(3,2,2,&pin_PC07),
+    TIM(3,2,3,&pin_PC08),
+    TIM(3,2,4,&pin_PC09),
+    TIM(4,2,1,&pin_PD12),
+    TIM(4,2,2,&pin_PD13),
+    TIM(4,2,3,&pin_PD14),
+    TIM(4,2,4,&pin_PD15),
+    TIM(9,3,1,&pin_PE05),
+    TIM(9,3,2,&pin_PE06),
+    TIM(1,1,1,&pin_PE09),
+    TIM(1,1,2,&pin_PE11),
+    TIM(1,1,3,&pin_PE13),
+    TIM(1,1,4,&pin_PE14),
+};
diff --git a/ports/stm/peripherals/stm32f4/stm32f411xe/periph.h b/ports/stm/peripherals/stm32f4/stm32f411xe/periph.h
new file mode 100644
index 000000000..d657d73b6
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f411xe/periph.h
@@ -0,0 +1,57 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F411VE_PERIPH_H
+#define MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F411VE_PERIPH_H
+
+//I2C
+extern I2C_TypeDef * mcu_i2c_banks[3];
+
+extern const mcu_i2c_sda_obj_t mcu_i2c_sda_list[7];
+extern const mcu_i2c_scl_obj_t mcu_i2c_scl_list[4];
+
+//SPI
+extern SPI_TypeDef * mcu_spi_banks[5];
+
+extern const mcu_spi_sck_obj_t mcu_spi_sck_list[15];
+extern const mcu_spi_mosi_obj_t mcu_spi_mosi_list[14];
+extern const mcu_spi_miso_obj_t mcu_spi_miso_list[12];
+extern const mcu_spi_nss_obj_t mcu_spi_nss_list[12];
+
+//UART
+extern USART_TypeDef * mcu_uart_banks[MAX_UART];
+extern bool mcu_uart_has_usart[MAX_UART];
+
+extern const mcu_uart_tx_obj_t mcu_uart_tx_list[7];
+extern const mcu_uart_rx_obj_t mcu_uart_rx_list[7];
+
+//Timers
+#define TIM_BANK_ARRAY_LEN 14
+#define TIM_PIN_ARRAY_LEN 44
+TIM_TypeDef * mcu_tim_banks[TIM_BANK_ARRAY_LEN];
+const mcu_tim_pin_obj_t mcu_tim_pin_list[TIM_PIN_ARRAY_LEN];
+
+#endif // MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F411VE_PERIPH_H
\ No newline at end of file
diff --git a/ports/stm/peripherals/stm32f4/stm32f411xe/pins.c b/ports/stm/peripherals/stm32f4/stm32f411xe/pins.c
new file mode 100644
index 000000000..7e88c3dcb
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f411xe/pins.c
@@ -0,0 +1,123 @@
+ /*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/obj.h"
+#include "py/mphal.h"
+#include "stm32f4/pins.h"
+
+const mcu_pin_obj_t pin_PE02 = PIN(4, 2, NO_ADC);
+const mcu_pin_obj_t pin_PE03 = PIN(4, 3, NO_ADC);
+const mcu_pin_obj_t pin_PE04 = PIN(4, 4, NO_ADC);
+const mcu_pin_obj_t pin_PE05 = PIN(4, 5, NO_ADC);
+const mcu_pin_obj_t pin_PE06 = PIN(4, 6, NO_ADC);
+
+const mcu_pin_obj_t pin_PC13 = PIN(2, 13, NO_ADC); //anti-tamp
+const mcu_pin_obj_t pin_PC14 = PIN(2, 14, NO_ADC); //OSC32_IN
+const mcu_pin_obj_t pin_PC15 = PIN(2, 15, NO_ADC); //OSC32_OUT
+
+const mcu_pin_obj_t pin_PC00 = PIN(2, 0, ADC_INPUT(ADC_1,10));
+const mcu_pin_obj_t pin_PC01 = PIN(2, 1, ADC_INPUT(ADC_1,11));
+const mcu_pin_obj_t pin_PC02 = PIN(2, 2, ADC_INPUT(ADC_1,12));
+const mcu_pin_obj_t pin_PC03 = PIN(2, 3, ADC_INPUT(ADC_1,13));
+
+const mcu_pin_obj_t pin_PA00 = PIN(0, 0, ADC_INPUT(ADC_1,0));
+const mcu_pin_obj_t pin_PA01 = PIN(0, 1, ADC_INPUT(ADC_1,1));
+const mcu_pin_obj_t pin_PA02 = PIN(0, 2, ADC_INPUT(ADC_1,2));
+const mcu_pin_obj_t pin_PA03 = PIN(0, 3, ADC_INPUT(ADC_1,3));
+const mcu_pin_obj_t pin_PA04 = PIN(0, 4, ADC_INPUT(ADC_1,4));
+const mcu_pin_obj_t pin_PA05 = PIN(0, 5, ADC_INPUT(ADC_1,5));
+const mcu_pin_obj_t pin_PA06 = PIN(0, 6, ADC_INPUT(ADC_1,6));
+const mcu_pin_obj_t pin_PA07 = PIN(0, 7, ADC_INPUT(ADC_1,7));
+
+const mcu_pin_obj_t pin_PC04 = PIN(2, 4, ADC_INPUT(ADC_1,14));
+const mcu_pin_obj_t pin_PC05 = PIN(2, 5, ADC_INPUT(ADC_1,15));
+
+const mcu_pin_obj_t pin_PB00 = PIN(1, 0, ADC_INPUT(ADC_1,8));
+const mcu_pin_obj_t pin_PB01 = PIN(1, 1, ADC_INPUT(ADC_1,9));
+const mcu_pin_obj_t pin_PB02 = PIN(1, 2, NO_ADC);
+
+const mcu_pin_obj_t pin_PE07 = PIN(4, 7, NO_ADC);
+const mcu_pin_obj_t pin_PE08 = PIN(4, 8, NO_ADC);
+const mcu_pin_obj_t pin_PE09 = PIN(4, 9, NO_ADC);
+const mcu_pin_obj_t pin_PE10 = PIN(4, 10, NO_ADC);
+const mcu_pin_obj_t pin_PE11 = PIN(4, 11, NO_ADC);
+const mcu_pin_obj_t pin_PE12 = PIN(4, 12, NO_ADC);
+const mcu_pin_obj_t pin_PE13 = PIN(4, 13, NO_ADC);
+const mcu_pin_obj_t pin_PE14 = PIN(4, 14, NO_ADC);
+const mcu_pin_obj_t pin_PE15 = PIN(4, 15, NO_ADC);
+
+const mcu_pin_obj_t pin_PB10 = PIN(1, 10, NO_ADC);
+const mcu_pin_obj_t pin_PB12 = PIN(1, 12, NO_ADC);
+const mcu_pin_obj_t pin_PB13 = PIN(1, 13, NO_ADC);
+const mcu_pin_obj_t pin_PB14 = PIN(1, 14, NO_ADC);
+const mcu_pin_obj_t pin_PB15 = PIN(1, 15, NO_ADC);
+
+const mcu_pin_obj_t pin_PD08 = PIN(3, 8, NO_ADC);
+const mcu_pin_obj_t pin_PD09 = PIN(3, 9, NO_ADC);
+const mcu_pin_obj_t pin_PD10 = PIN(3, 10, NO_ADC);
+const mcu_pin_obj_t pin_PD11 = PIN(3, 11, NO_ADC);
+const mcu_pin_obj_t pin_PD12 = PIN(3, 12, NO_ADC);
+const mcu_pin_obj_t pin_PD13 = PIN(3, 13, NO_ADC);
+const mcu_pin_obj_t pin_PD14 = PIN(3, 14, NO_ADC);
+const mcu_pin_obj_t pin_PD15 = PIN(3, 15, NO_ADC);
+
+const mcu_pin_obj_t pin_PC06 = PIN(2, 6, NO_ADC);
+const mcu_pin_obj_t pin_PC07 = PIN(2, 7, NO_ADC);
+const mcu_pin_obj_t pin_PC08 = PIN(2, 8, NO_ADC);
+const mcu_pin_obj_t pin_PC09 = PIN(2, 9, NO_ADC);
+
+const mcu_pin_obj_t pin_PA08 = PIN(0, 8, NO_ADC);
+const mcu_pin_obj_t pin_PA09 = PIN(0, 9, NO_ADC);
+const mcu_pin_obj_t pin_PA10 = PIN(0, 10, NO_ADC);
+const mcu_pin_obj_t pin_PA11 = PIN(0, 11, NO_ADC);
+const mcu_pin_obj_t pin_PA12 = PIN(0, 12, NO_ADC);
+const mcu_pin_obj_t pin_PA13 = PIN(0, 13, NO_ADC); //SWDIO
+const mcu_pin_obj_t pin_PA14 = PIN(0, 14, NO_ADC); //SWCLK
+const mcu_pin_obj_t pin_PA15 = PIN(0, 15, NO_ADC); //JTDI
+
+const mcu_pin_obj_t pin_PC10 = PIN(2, 10, NO_ADC);
+const mcu_pin_obj_t pin_PC11 = PIN(2, 11, NO_ADC);
+const mcu_pin_obj_t pin_PC12 = PIN(2, 12, NO_ADC);
+
+const mcu_pin_obj_t pin_PD00 = PIN(3, 0, NO_ADC);
+const mcu_pin_obj_t pin_PD01 = PIN(3, 1, NO_ADC);
+const mcu_pin_obj_t pin_PD02 = PIN(3, 2, NO_ADC);
+const mcu_pin_obj_t pin_PD03 = PIN(3, 3, NO_ADC);
+const mcu_pin_obj_t pin_PD04 = PIN(3, 4, NO_ADC);
+const mcu_pin_obj_t pin_PD05 = PIN(3, 5, NO_ADC);
+const mcu_pin_obj_t pin_PD06 = PIN(3, 6, NO_ADC);
+const mcu_pin_obj_t pin_PD07 = PIN(3, 7, NO_ADC);
+
+const mcu_pin_obj_t pin_PB03 = PIN(1, 3, NO_ADC);
+const mcu_pin_obj_t pin_PB04 = PIN(1, 4, NO_ADC);
+const mcu_pin_obj_t pin_PB05 = PIN(1, 5, NO_ADC);
+const mcu_pin_obj_t pin_PB06 = PIN(1, 6, NO_ADC);
+const mcu_pin_obj_t pin_PB07 = PIN(1, 7, NO_ADC);
+const mcu_pin_obj_t pin_PB08 = PIN(1, 8, NO_ADC);
+const mcu_pin_obj_t pin_PB09 = PIN(1, 9, NO_ADC);
+
+const mcu_pin_obj_t pin_PE00 = PIN(4, 0, NO_ADC);
+const mcu_pin_obj_t pin_PE01 = PIN(4, 1, NO_ADC);
\ No newline at end of file
diff --git a/ports/stm/peripherals/stm32f4/stm32f411xe/pins.h b/ports/stm/peripherals/stm32f4/stm32f411xe/pins.h
new file mode 100644
index 000000000..37d3a5cf1
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f411xe/pins.h
@@ -0,0 +1,121 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F411VE_PINS_H
+#define MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F411VE_PINS_H
+
+//Pins in datasheet order: DocID026289 Rev 7 page 38. LQFP100 only
+//pg 38
+extern const mcu_pin_obj_t pin_PE02;
+extern const mcu_pin_obj_t pin_PE03;
+extern const mcu_pin_obj_t pin_PE04;
+extern const mcu_pin_obj_t pin_PE05;
+//pg 39
+extern const mcu_pin_obj_t pin_PE06;
+extern const mcu_pin_obj_t pin_PC13;
+extern const mcu_pin_obj_t pin_PC14;
+extern const mcu_pin_obj_t pin_PC15;
+extern const mcu_pin_obj_t pin_PC00;
+extern const mcu_pin_obj_t pin_PC01;
+extern const mcu_pin_obj_t pin_PC02;
+extern const mcu_pin_obj_t pin_PC03;
+//pg 40
+extern const mcu_pin_obj_t pin_PA00;
+extern const mcu_pin_obj_t pin_PA01;
+extern const mcu_pin_obj_t pin_PA02;
+extern const mcu_pin_obj_t pin_PA03;
+extern const mcu_pin_obj_t pin_PA04;
+extern const mcu_pin_obj_t pin_PA05;
+extern const mcu_pin_obj_t pin_PA06;
+extern const mcu_pin_obj_t pin_PA07;
+//pg 41
+extern const mcu_pin_obj_t pin_PC04;
+extern const mcu_pin_obj_t pin_PC05;
+extern const mcu_pin_obj_t pin_PB00;
+extern const mcu_pin_obj_t pin_PB01;
+extern const mcu_pin_obj_t pin_PB02;
+extern const mcu_pin_obj_t pin_PE07;
+extern const mcu_pin_obj_t pin_PE08;
+extern const mcu_pin_obj_t pin_PE09;
+extern const mcu_pin_obj_t pin_PE10;
+extern const mcu_pin_obj_t pin_PE11;
+extern const mcu_pin_obj_t pin_PE12;
+extern const mcu_pin_obj_t pin_PE13;
+extern const mcu_pin_obj_t pin_PE14;
+extern const mcu_pin_obj_t pin_PE15;
+//pg 42
+extern const mcu_pin_obj_t pin_PB10;
+extern const mcu_pin_obj_t pin_PB12;
+extern const mcu_pin_obj_t pin_PB13;
+extern const mcu_pin_obj_t pin_PB14;
+extern const mcu_pin_obj_t pin_PB15;
+extern const mcu_pin_obj_t pin_PD08;
+extern const mcu_pin_obj_t pin_PD09;
+extern const mcu_pin_obj_t pin_PD10;
+extern const mcu_pin_obj_t pin_PD11;
+extern const mcu_pin_obj_t pin_PD12;
+//pg 43
+extern const mcu_pin_obj_t pin_PD13;
+extern const mcu_pin_obj_t pin_PD14;
+extern const mcu_pin_obj_t pin_PD15;
+extern const mcu_pin_obj_t pin_PC06;
+extern const mcu_pin_obj_t pin_PC07;
+extern const mcu_pin_obj_t pin_PC08;
+extern const mcu_pin_obj_t pin_PC09;
+extern const mcu_pin_obj_t pin_PA08;
+extern const mcu_pin_obj_t pin_PA09;
+//pg 44
+extern const mcu_pin_obj_t pin_PA10;
+extern const mcu_pin_obj_t pin_PA11;
+extern const mcu_pin_obj_t pin_PA12;
+extern const mcu_pin_obj_t pin_PA13;
+extern const mcu_pin_obj_t pin_PA14;
+extern const mcu_pin_obj_t pin_PA15;
+extern const mcu_pin_obj_t pin_PC10;
+extern const mcu_pin_obj_t pin_PC11;
+extern const mcu_pin_obj_t pin_PC12;
+//pg 45
+extern const mcu_pin_obj_t pin_PD00;
+extern const mcu_pin_obj_t pin_PD01;
+extern const mcu_pin_obj_t pin_PD02;
+extern const mcu_pin_obj_t pin_PD03;
+extern const mcu_pin_obj_t pin_PD04;
+extern const mcu_pin_obj_t pin_PD05;
+extern const mcu_pin_obj_t pin_PD06;
+extern const mcu_pin_obj_t pin_PD07;
+extern const mcu_pin_obj_t pin_PB03;
+extern const mcu_pin_obj_t pin_PB04;
+extern const mcu_pin_obj_t pin_PB05;
+extern const mcu_pin_obj_t pin_PB06;
+//pg 46
+extern const mcu_pin_obj_t pin_PB07;
+extern const mcu_pin_obj_t pin_PB08;
+extern const mcu_pin_obj_t pin_PB09;
+extern const mcu_pin_obj_t pin_PE00;
+extern const mcu_pin_obj_t pin_PE01;
+
+
+#endif // MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F411VE_PINS_H
diff --git a/ports/stm/peripherals/stm32f4/stm32f412zx/clocks.c b/ports/stm/peripherals/stm32f4/stm32f412zx/clocks.c
new file mode 100644
index 000000000..b208f9dfb
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f412zx/clocks.c
@@ -0,0 +1,75 @@
+
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "stm32f4xx_hal.h"
+#include "py/mpconfig.h"
+
+void stm32f4_peripherals_clocks_init(void) {
+    //System clock init
+	RCC_ClkInitTypeDef RCC_ClkInitStruct;
+    RCC_OscInitTypeDef RCC_OscInitStruct;
+    RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
+
+    /* Enable Power Control clock */
+    __HAL_RCC_PWR_CLK_ENABLE();
+
+    /* The voltage scaling allows optimizing the power consumption when the
+    * device is clocked below the maximum system frequency, to update the
+    * voltage scaling value regarding system frequency refer to product
+    * datasheet.  */
+    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
+
+    /* Enable HSE Oscillator and activate PLL with HSE as source */
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+    RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+    RCC_OscInitStruct.PLL.PLLM = BOARD_OSC_DIV;
+    RCC_OscInitStruct.PLL.PLLN = 200;
+    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
+    RCC_OscInitStruct.PLL.PLLQ = 7;
+    RCC_OscInitStruct.PLL.PLLR = 2;
+    HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+    /* Select PLLSAI output as USB clock source */
+    PeriphClkInitStruct.PLLI2S.PLLI2SM = 8;
+    PeriphClkInitStruct.PLLI2S.PLLI2SQ = 4;
+    PeriphClkInitStruct.PLLI2S.PLLI2SN = 192;
+    PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_CK48;
+    PeriphClkInitStruct.Clk48ClockSelection = RCC_CK48CLKSOURCE_PLLI2SQ;
+    HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
+
+    /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
+    * clocks dividers */
+    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK |
+                                RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
+
+    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
+    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
+    HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3);
+}
diff --git a/ports/stm/peripherals/stm32f4/stm32f412zx/gpio.c b/ports/stm/peripherals/stm32f4/stm32f412zx/gpio.c
new file mode 100644
index 000000000..d17ab4e01
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f412zx/gpio.c
@@ -0,0 +1,243 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/* GPIO PIN REFERENCE
+#define LED3_Pin GPIO_PIN_2
+#define LED3_GPIO_Port GPIOE
+#define LED4_Pin GPIO_PIN_3
+#define LED4_GPIO_Port GPIOE
+#define DFSDM_DATIN3_Pin GPIO_PIN_4
+#define DFSDM_DATIN3_GPIO_Port GPIOE
+#define A0_Pin GPIO_PIN_0
+#define A0_GPIO_Port GPIOF
+#define LCD_BLCTRL_Pin GPIO_PIN_5
+#define LCD_BLCTRL_GPIO_Port GPIOF
+#define QSPI_BK1_IO3_Pin GPIO_PIN_6
+#define QSPI_BK1_IO3_GPIO_Port GPIOF
+#define QSPI_BK1_IO2_Pin GPIO_PIN_7
+#define QSPI_BK1_IO2_GPIO_Port GPIOF
+#define QSPI_BK1_IO0_Pin GPIO_PIN_8
+#define QSPI_BK1_IO0_GPIO_Port GPIOF
+#define QSPI_BK1_IO1_Pin GPIO_PIN_9
+#define QSPI_BK1_IO1_GPIO_Port GPIOF
+#define STLK_MCO_Pin GPIO_PIN_0
+#define STLK_MCO_GPIO_Port GPIOH
+#define DFSDM_CKOUT_Pin GPIO_PIN_2
+#define DFSDM_CKOUT_GPIO_Port GPIOC
+#define JOY_SEL_Pin GPIO_PIN_0
+#define JOY_SEL_GPIO_Port GPIOA
+#define STLINK_RX_Pin GPIO_PIN_2
+#define STLINK_RX_GPIO_Port GPIOA
+#define STLINK_TX_Pin GPIO_PIN_3
+#define STLINK_TX_GPIO_Port GPIOA
+#define CODEC_I2S3_WS_Pin GPIO_PIN_4
+#define CODEC_I2S3_WS_GPIO_Port GPIOA
+#define DFSDM_DATIN0_Pin GPIO_PIN_1
+#define DFSDM_DATIN0_GPIO_Port GPIOB
+#define QSPI_CLK_Pin GPIO_PIN_2
+#define QSPI_CLK_GPIO_Port GPIOB
+#define EXT_RESET_Pin GPIO_PIN_11
+#define EXT_RESET_GPIO_Port GPIOF
+#define CTP_RST_Pin GPIO_PIN_12
+#define CTP_RST_GPIO_Port GPIOF
+#define JOY_RIGHT_Pin GPIO_PIN_14
+#define JOY_RIGHT_GPIO_Port GPIOF
+#define JOY_LEFT_Pin GPIO_PIN_15
+#define JOY_LEFT_GPIO_Port GPIOF
+#define JOY_UP_Pin GPIO_PIN_0
+#define JOY_UP_GPIO_Port GPIOG
+#define JOY_DOWN_Pin GPIO_PIN_1
+#define JOY_DOWN_GPIO_Port GPIOG
+#define D4_Pin GPIO_PIN_7
+#define D4_GPIO_Port GPIOE
+#define D5_Pin GPIO_PIN_8
+#define D5_GPIO_Port GPIOE
+#define D6_Pin GPIO_PIN_9
+#define D6_GPIO_Port GPIOE
+#define D7_Pin GPIO_PIN_10
+#define D7_GPIO_Port GPIOE
+#define D8_Pin GPIO_PIN_11
+#define D8_GPIO_Port GPIOE
+#define D9_Pin GPIO_PIN_12
+#define D9_GPIO_Port GPIOE
+#define D10_Pin GPIO_PIN_13
+#define D10_GPIO_Port GPIOE
+#define D11_Pin GPIO_PIN_14
+#define D11_GPIO_Port GPIOE
+#define D12_Pin GPIO_PIN_15
+#define D12_GPIO_Port GPIOE
+#define I2C2_SCL_Pin GPIO_PIN_10
+#define I2C2_SCL_GPIO_Port GPIOB
+#define M2_CKIN_Pin GPIO_PIN_11
+#define M2_CKIN_GPIO_Port GPIOB
+#define CODEC_I2S3_SCK_Pin GPIO_PIN_12
+#define CODEC_I2S3_SCK_GPIO_Port GPIOB
+#define D13_Pin GPIO_PIN_8
+#define D13_GPIO_Port GPIOD
+#define D14_Pin GPIO_PIN_9
+#define D14_GPIO_Port GPIOD
+#define D15_Pin GPIO_PIN_10
+#define D15_GPIO_Port GPIOD
+#define LCD_RESET_Pin GPIO_PIN_11
+#define LCD_RESET_GPIO_Port GPIOD
+#define D0_Pin GPIO_PIN_14
+#define D0_GPIO_Port GPIOD
+#define D1_Pin GPIO_PIN_15
+#define D1_GPIO_Port GPIOD
+#define CODEC_INT_Pin GPIO_PIN_2
+#define CODEC_INT_GPIO_Port GPIOG
+#define LCD_TE_Pin GPIO_PIN_4
+#define LCD_TE_GPIO_Port GPIOG
+#define CTP_INT_Pin GPIO_PIN_5
+#define CTP_INT_GPIO_Port GPIOG
+#define QSPI_BK1_NCS_Pin GPIO_PIN_6
+#define QSPI_BK1_NCS_GPIO_Port GPIOG
+#define USB_OTGFS_OVRCR_Pin GPIO_PIN_7
+#define USB_OTGFS_OVRCR_GPIO_Port GPIOG
+#define USB_OTGFS_PPWR_EN_Pin GPIO_PIN_8
+#define USB_OTGFS_PPWR_EN_GPIO_Port GPIOG
+#define CODEC_I2S3_MCK_Pin GPIO_PIN_7
+#define CODEC_I2S3_MCK_GPIO_Port GPIOC
+#define uSD_D0_Pin GPIO_PIN_8
+#define uSD_D0_GPIO_Port GPIOC
+#define uSD_D1_Pin GPIO_PIN_9
+#define uSD_D1_GPIO_Port GPIOC
+#define M2_CKINA8_Pin GPIO_PIN_8
+#define M2_CKINA8_GPIO_Port GPIOA
+#define USB_OTGFS_VBUS_Pin GPIO_PIN_9
+#define USB_OTGFS_VBUS_GPIO_Port GPIOA
+#define USB_OTGFS_ID_Pin GPIO_PIN_10
+#define USB_OTGFS_ID_GPIO_Port GPIOA
+#define USB_OTGFS_DM_Pin GPIO_PIN_11
+#define USB_OTGFS_DM_GPIO_Port GPIOA
+#define USB_OTGFS_DP_Pin GPIO_PIN_12
+#define USB_OTGFS_DP_GPIO_Port GPIOA
+#define SWDIO_Pin GPIO_PIN_13
+#define SWDIO_GPIO_Port GPIOA
+#define SWCLK_Pin GPIO_PIN_14
+#define SWCLK_GPIO_Port GPIOA
+#define uSD_D2_Pin GPIO_PIN_10
+#define uSD_D2_GPIO_Port GPIOC
+#define uSD_D3_Pin GPIO_PIN_11
+#define uSD_D3_GPIO_Port GPIOC
+#define uSD_CLK_Pin GPIO_PIN_12
+#define uSD_CLK_GPIO_Port GPIOC
+#define D2_Pin GPIO_PIN_0
+#define D2_GPIO_Port GPIOD
+#define D3_Pin GPIO_PIN_1
+#define D3_GPIO_Port GPIOD
+#define uSD_CMD_Pin GPIO_PIN_2
+#define uSD_CMD_GPIO_Port GPIOD
+#define uSD_DETECT_Pin GPIO_PIN_3
+#define uSD_DETECT_GPIO_Port GPIOD
+#define FMC_NOE_Pin GPIO_PIN_4
+#define FMC_NOE_GPIO_Port GPIOD
+#define FMC_NWE_Pin GPIO_PIN_5
+#define FMC_NWE_GPIO_Port GPIOD
+#define FMC_NE1_Pin GPIO_PIN_7
+#define FMC_NE1_GPIO_Port GPIOD
+#define SWO_Pin GPIO_PIN_3
+#define SWO_GPIO_Port GPIOB
+#define CODEC_I2S3ext_SD_Pin GPIO_PIN_4
+#define CODEC_I2S3ext_SD_GPIO_Port GPIOB
+#define CODEC_I2S3_SD_Pin GPIO_PIN_5
+#define CODEC_I2S3_SD_GPIO_Port GPIOB
+#define I2C1_SCL_Pin GPIO_PIN_6
+#define I2C1_SCL_GPIO_Port GPIOB
+#define I2C1_SDA_Pin GPIO_PIN_7
+#define I2C1_SDA_GPIO_Port GPIOB
+#define I2C2_SDA_Pin GPIO_PIN_9
+#define I2C2_SDA_GPIO_Port GPIOB
+#define LED1_Pin GPIO_PIN_0
+#define LED1_GPIO_Port GPIOE
+#define LED2_Pin GPIO_PIN_1
+#define LED2_GPIO_Port GPIOE
+*/
+
+#include "stm32f4xx_hal.h"
+#include "stm32f4/gpio.h"
+#include "common-hal/microcontroller/Pin.h"
+
+void stm32f4_peripherals_gpio_init(void) {
+	//Enable all GPIO for now
+	GPIO_InitTypeDef GPIO_InitStruct = {0};
+	__HAL_RCC_GPIOE_CLK_ENABLE();
+	__HAL_RCC_GPIOC_CLK_ENABLE();
+	__HAL_RCC_GPIOF_CLK_ENABLE();
+	__HAL_RCC_GPIOH_CLK_ENABLE();
+	__HAL_RCC_GPIOA_CLK_ENABLE();
+	__HAL_RCC_GPIOB_CLK_ENABLE();
+	__HAL_RCC_GPIOG_CLK_ENABLE();
+	__HAL_RCC_GPIOD_CLK_ENABLE();
+
+	HAL_GPIO_WritePin(GPIOE, GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3, GPIO_PIN_RESET);
+	//HAL_GPIO_WritePin(USB_OTGFS_PPWR_EN_GPIO_Port, USB_OTGFS_PPWR_EN_Pin, GPIO_PIN_SET);
+
+	//Configure LED pins
+	GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3;
+	GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
+	GPIO_InitStruct.Pull = GPIO_NOPULL;
+	GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
+	HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
+
+	//Status LED chain
+	stm32f4_peripherals_status_led(0,1);
+	stm32f4_peripherals_status_led(1,0);
+	stm32f4_peripherals_status_led(2,0);
+	stm32f4_peripherals_status_led(3,0);
+
+	//Never reset pins
+	never_reset_pin_number(2,13); //PC13 anti tamp
+    never_reset_pin_number(2,14); //PC14 OSC32_IN
+    never_reset_pin_number(2,15); //PC15 OSC32_OUT
+    never_reset_pin_number(0,13); //PA13 SWDIO
+    never_reset_pin_number(0,14); //PA14 SWCLK
+    //never_reset_pin_number(0,15); //PA15 JTDI
+    //never_reset_pin_number(1,3); //PB3 JTDO
+    //never_reset_pin_number(1,4); //PB4 JTRST
+
+    // Port H is not included in GPIO port array
+    // never_reset_pin_number(5,0); //PH0 JTDO   
+    // never_reset_pin_number(5,1); //PH1 JTRST
+}
+
+//LEDs are inverted on F411 DISCO
+void stm32f4_peripherals_status_led(uint8_t led, uint8_t state) {
+	switch(led)
+	{
+		case 0: 	HAL_GPIO_WritePin(GPIOE, GPIO_PIN_0, (state ^ 1));
+				break;
+		case 1: 	HAL_GPIO_WritePin(GPIOE, GPIO_PIN_1, (state ^ 1));
+				break;
+		case 2: 	HAL_GPIO_WritePin(GPIOE, GPIO_PIN_2, (state ^ 1));
+				break;
+		case 3: 	HAL_GPIO_WritePin(GPIOE, GPIO_PIN_3, (state ^ 1));
+				break;
+		default: break;
+	}
+}
+
+
diff --git a/ports/stm/peripherals/stm32f4/stm32f412zx/periph.c b/ports/stm/peripherals/stm32f4/stm32f412zx/periph.c
new file mode 100644
index 000000000..f5effa80e
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f412zx/periph.c
@@ -0,0 +1,223 @@
+ /*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/obj.h"
+#include "py/mphal.h"
+#include "stm32f4/pins.h"
+#include "stm32f4/periph.h"
+
+// I2C
+
+I2C_TypeDef * mcu_i2c_banks[3] = {I2C1, I2C2, I2C3};
+
+const mcu_i2c_sda_obj_t mcu_i2c_sda_list[8] = {
+    I2C_SDA(1, 4, &pin_PB07),
+    I2C_SDA(1, 4, &pin_PB09),
+    I2C_SDA(2, 4, &pin_PB11), //not on LQFP100
+    I2C_SDA(2, 9, &pin_PB09),
+    I2C_SDA(2, 9, &pin_PB03),
+    I2C_SDA(3, 4, &pin_PC09),
+    I2C_SDA(3, 9, &pin_PB04),
+    I2C_SDA(3, 9, &pin_PB08)
+};
+
+const mcu_i2c_scl_obj_t mcu_i2c_scl_list[4] = {
+    I2C_SCL(1, 4, &pin_PB06),
+    I2C_SCL(1, 4, &pin_PB08),
+    I2C_SCL(2, 4, &pin_PB10),
+    I2C_SCL(3, 4, &pin_PA08)
+};
+
+// SPI
+
+SPI_TypeDef * mcu_spi_banks[5] = {SPI1, SPI2, SPI3, SPI4, SPI5};
+
+const mcu_spi_sck_obj_t mcu_spi_sck_list[15] = {
+    SPI(1, 5, &pin_PA05),
+    SPI(1, 5, &pin_PB03),
+    SPI(2, 5, &pin_PB10),
+    SPI(2, 5, &pin_PB13),
+    SPI(2, 5, &pin_PC07),
+    SPI(2, 5, &pin_PD03),
+    SPI(3, 6, &pin_PB03),
+    SPI(3, 7, &pin_PB12),
+    SPI(3, 6, &pin_PC10),
+    SPI(4, 6, &pin_PB13),
+    SPI(4, 5, &pin_PE02),
+    SPI(4, 5, &pin_PE12),
+    SPI(5, 6, &pin_PB00),
+    SPI(5, 6, &pin_PE02),
+    SPI(5, 6, &pin_PE12)
+};
+
+const mcu_spi_mosi_obj_t mcu_spi_mosi_list[14] = {
+    SPI(1, 5, &pin_PA07),
+    SPI(1, 5, &pin_PB05),
+    SPI(2, 5, &pin_PB15),
+    SPI(2, 5, &pin_PC03),
+    SPI(3, 6, &pin_PB05),
+    SPI(3, 6, &pin_PC12),
+    SPI(3, 5, &pin_PD06),
+    SPI(4, 5, &pin_PA01),
+    SPI(4, 5, &pin_PE06),
+    SPI(4, 5, &pin_PE14),
+    SPI(5, 6, &pin_PA10),
+    SPI(5, 6, &pin_PB08),
+    SPI(5, 6, &pin_PE06),
+    SPI(5, 6, &pin_PE14)
+};
+
+const mcu_spi_miso_obj_t mcu_spi_miso_list[12] = {
+    SPI(1, 5, &pin_PA06),
+    SPI(1, 5, &pin_PB04),
+    SPI(2, 5, &pin_PB14),
+    SPI(2, 5, &pin_PC02),
+    SPI(3, 6, &pin_PB04),
+    SPI(3, 6, &pin_PC11),
+    SPI(4, 6, &pin_PA11),
+    SPI(4, 5, &pin_PE05),
+    SPI(4, 5, &pin_PE13),
+    SPI(5, 6, &pin_PA12),
+    SPI(5, 6, &pin_PE05),
+    SPI(5, 6, &pin_PE13)
+};
+
+const mcu_spi_nss_obj_t mcu_spi_nss_list[12] = {
+    SPI(1, 5, &pin_PA04),
+    SPI(1, 5, &pin_PA15),
+    SPI(2, 5, &pin_PB09),
+    SPI(2, 5, &pin_PB12),
+    SPI(3, 6, &pin_PA04),
+    SPI(3, 6, &pin_PA15),
+    SPI(4, 6, &pin_PB12),
+    SPI(4, 5, &pin_PE04),
+    SPI(4, 5, &pin_PE11),
+    SPI(5, 6, &pin_PB01),
+    SPI(5, 6, &pin_PE04),
+    SPI(5, 6, &pin_PE11)
+};
+
+//UART
+
+USART_TypeDef * mcu_uart_banks[MAX_UART] = {USART1, USART2, USART3, NULL, NULL, USART6};
+bool mcu_uart_has_usart[MAX_UART] = {true, true, true, false, false, true};
+
+const mcu_uart_tx_obj_t mcu_uart_tx_list[11] = {
+    UART(2, 7, &pin_PA02),
+    UART(1, 7, &pin_PA09),
+    UART(1, 7, &pin_PA15),
+    UART(6, 8, &pin_PA11),
+    UART(1, 7, &pin_PB06),
+    UART(3, 7, &pin_PB10),
+    UART(6, 8, &pin_PC06),
+    UART(3, 7, &pin_PC10),
+    UART(2, 7, &pin_PD05),
+    UART(3, 7, &pin_PD08),
+    UART(6, 8, &pin_PG14),
+};
+
+const mcu_uart_rx_obj_t mcu_uart_rx_list[12] = {
+    UART(2, 7, &pin_PA03),
+    UART(1, 7, &pin_PA10),
+    UART(6, 8, &pin_PA12),
+    UART(1, 7, &pin_PB03),
+    UART(1, 7, &pin_PB07),
+    UART(3, 7, &pin_PB11),
+    UART(3, 7, &pin_PC05),
+    UART(6, 8, &pin_PC07),
+    UART(3, 7, &pin_PC11),
+    UART(2, 7, &pin_PD06),
+    UART(3, 7, &pin_PD09),
+    UART(6, 8, &pin_PG09),
+};
+
+//Timers
+//TIM6 and TIM7 are basic timers that are only used by DAC, and don't have pins
+TIM_TypeDef * mcu_tim_banks[14] = {TIM1, TIM2, TIM3, TIM4, TIM5, NULL, NULL, TIM8, TIM9, TIM10,
+                                    TIM11, TIM12, TIM13, TIM14};
+
+const mcu_tim_pin_obj_t mcu_tim_pin_list[60] = {
+    TIM(2,1,1,&pin_PA00),
+    TIM(5,2,1,&pin_PA00),
+    TIM(2,1,2,&pin_PA01),
+    TIM(5,2,2,&pin_PA01),
+    TIM(2,1,3,&pin_PA02),
+    TIM(5,2,3,&pin_PA02),
+    TIM(2,1,4,&pin_PA03),
+    TIM(5,2,4,&pin_PA03),
+    TIM(9,3,1,&pin_PA02),
+    TIM(9,3,2,&pin_PA03),
+    TIM(3,2,1,&pin_PA06),
+    TIM(13,9,1,&pin_PA06),
+    TIM(3,2,2,&pin_PA07),
+    TIM(14,9,1,&pin_PA07),
+    TIM(1,1,1,&pin_PA08),
+    TIM(1,1,2,&pin_PA09),
+    TIM(1,1,3,&pin_PA10),
+    TIM(1,1,4,&pin_PA11),
+    TIM(2,1,1,&pin_PA15),
+    TIM(3,2,3,&pin_PB00),
+    TIM(3,2,4,&pin_PB01),
+    TIM(2,1,2,&pin_PB03),
+    TIM(3,2,1,&pin_PB04),
+    TIM(3,2,2,&pin_PB05),
+    TIM(4,2,1,&pin_PB06),
+    TIM(4,2,2,&pin_PB07),
+    TIM(4,2,3,&pin_PB08),
+    TIM(10,2,1,&pin_PB08),
+    TIM(4,2,4,&pin_PB09),
+    TIM(11,2,1,&pin_PB09),
+    TIM(2,1,3,&pin_PB10),
+    TIM(2,1,4,&pin_PB11),
+    TIM(12,9,1,&pin_PB14),
+    TIM(12,9,2,&pin_PB15),
+    TIM(3,2,1,&pin_PC06),
+    TIM(3,2,2,&pin_PC07),
+    TIM(3,2,3,&pin_PC08),
+    TIM(3,2,4,&pin_PC09),
+    TIM(8,3,1,&pin_PC06),
+    TIM(8,3,2,&pin_PC07),
+    TIM(8,3,3,&pin_PC08),
+    TIM(8,3,4,&pin_PC09),
+    TIM(4,2,1,&pin_PD12),
+    TIM(4,2,2,&pin_PD13),
+    TIM(4,2,3,&pin_PD14),
+    TIM(4,2,4,&pin_PD15),
+    TIM(9,3,1,&pin_PE05),
+    TIM(9,3,2,&pin_PE06),
+    TIM(1,1,1,&pin_PE09),
+    TIM(1,1,2,&pin_PE11),
+    TIM(1,1,3,&pin_PE13),
+    TIM(1,1,4,&pin_PE14),
+    TIM(10,3,1,&pin_PF06),
+    TIM(11,3,1,&pin_PF07),
+    TIM(13,9,1,&pin_PF08),
+    TIM(14,9,1,&pin_PF09),
+    TIM(5,2,1,&pin_PF03),
+    TIM(5,2,2,&pin_PF04),
+    TIM(5,2,3,&pin_PF05),
+    TIM(5,2,4,&pin_PF10),
+};
diff --git a/ports/stm/peripherals/stm32f4/stm32f412zx/periph.h b/ports/stm/peripherals/stm32f4/stm32f412zx/periph.h
new file mode 100644
index 000000000..e0141e6da
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f412zx/periph.h
@@ -0,0 +1,58 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F411VE_PERIPH_H
+#define MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F411VE_PERIPH_H
+
+//I2C
+extern I2C_TypeDef * mcu_i2c_banks[3];
+
+extern const mcu_i2c_sda_obj_t mcu_i2c_sda_list[8];
+extern const mcu_i2c_scl_obj_t mcu_i2c_scl_list[4];
+
+
+//SPI
+extern SPI_TypeDef * mcu_spi_banks[5];
+
+extern const mcu_spi_sck_obj_t mcu_spi_sck_list[15];
+extern const mcu_spi_mosi_obj_t mcu_spi_mosi_list[14];
+extern const mcu_spi_miso_obj_t mcu_spi_miso_list[12];
+extern const mcu_spi_nss_obj_t mcu_spi_nss_list[12];
+
+//UART
+extern USART_TypeDef * mcu_uart_banks[MAX_UART];
+extern bool mcu_uart_has_usart[MAX_UART];
+
+extern const mcu_uart_tx_obj_t mcu_uart_tx_list[11];
+extern const mcu_uart_rx_obj_t mcu_uart_rx_list[12];
+
+//Timers
+#define TIM_BANK_ARRAY_LEN 14
+#define TIM_PIN_ARRAY_LEN 60
+TIM_TypeDef * mcu_tim_banks[TIM_BANK_ARRAY_LEN];
+const mcu_tim_pin_obj_t mcu_tim_pin_list[TIM_PIN_ARRAY_LEN];
+
+#endif // MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F411VE_PERIPH_H
\ No newline at end of file
diff --git a/ports/stm/peripherals/stm32f4/stm32f412zx/pins.c b/ports/stm/peripherals/stm32f4/stm32f412zx/pins.c
new file mode 100644
index 000000000..c56de5a29
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f412zx/pins.c
@@ -0,0 +1,161 @@
+ /*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/obj.h"
+#include "py/mphal.h"
+#include "stm32f4/pins.h"
+
+const mcu_pin_obj_t pin_PE02 = PIN(4, 2, NO_ADC);
+const mcu_pin_obj_t pin_PE03 = PIN(4, 3, NO_ADC);
+const mcu_pin_obj_t pin_PE04 = PIN(4, 4, NO_ADC);
+const mcu_pin_obj_t pin_PE05 = PIN(4, 5, NO_ADC);
+const mcu_pin_obj_t pin_PE06 = PIN(4, 6, NO_ADC);
+
+const mcu_pin_obj_t pin_PC13 = PIN(2, 13, NO_ADC); //anti-tamp
+const mcu_pin_obj_t pin_PC14 = PIN(2, 14, NO_ADC); //OSC32_IN
+const mcu_pin_obj_t pin_PC15 = PIN(2, 15, NO_ADC); //OSC32_OUT
+
+const mcu_pin_obj_t pin_PF00 = PIN(5, 0, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PF01 = PIN(5, 1, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PF02 = PIN(5, 2, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PF03 = PIN(5, 3, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PF04 = PIN(5, 4, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PF05 = PIN(5, 5, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PF06 = PIN(5, 6, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PF07 = PIN(5, 7, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PF08 = PIN(5, 8, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PF09 = PIN(5, 9, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PF10 = PIN(5, 10, NO_ADC); // 144 only 
+
+const mcu_pin_obj_t pin_PC00 = PIN(2, 0, ADC_INPUT(ADC_1,10));
+const mcu_pin_obj_t pin_PC01 = PIN(2, 1, ADC_INPUT(ADC_1,11));
+const mcu_pin_obj_t pin_PC02 = PIN(2, 2, ADC_INPUT(ADC_1,12));
+const mcu_pin_obj_t pin_PC03 = PIN(2, 3, ADC_INPUT(ADC_1,13));
+
+const mcu_pin_obj_t pin_PA00 = PIN(0, 0, ADC_INPUT(ADC_1,0));
+const mcu_pin_obj_t pin_PA01 = PIN(0, 1, ADC_INPUT(ADC_1,1));
+const mcu_pin_obj_t pin_PA02 = PIN(0, 2, ADC_INPUT(ADC_1,2));
+const mcu_pin_obj_t pin_PA03 = PIN(0, 3, ADC_INPUT(ADC_1,3));
+const mcu_pin_obj_t pin_PA04 = PIN(0, 4, ADC_INPUT(ADC_1,4));
+const mcu_pin_obj_t pin_PA05 = PIN(0, 5, ADC_INPUT(ADC_1,5));
+const mcu_pin_obj_t pin_PA06 = PIN(0, 6, ADC_INPUT(ADC_1,6));
+const mcu_pin_obj_t pin_PA07 = PIN(0, 7, ADC_INPUT(ADC_1,7));
+
+const mcu_pin_obj_t pin_PC04 = PIN(2, 4, ADC_INPUT(ADC_1,14));
+const mcu_pin_obj_t pin_PC05 = PIN(2, 5, ADC_INPUT(ADC_1,15));
+
+const mcu_pin_obj_t pin_PB00 = PIN(1, 0, ADC_INPUT(ADC_1,8));
+const mcu_pin_obj_t pin_PB01 = PIN(1, 1, ADC_INPUT(ADC_1,9));
+const mcu_pin_obj_t pin_PB02 = PIN(1, 2, NO_ADC);
+
+const mcu_pin_obj_t pin_PF11 = PIN(5, 11, NO_ADC); // 144 only 
+const mcu_pin_obj_t pin_PF12 = PIN(5, 12, NO_ADC); // 144 only 
+const mcu_pin_obj_t pin_PF13 = PIN(5, 13, NO_ADC); // 144 only 
+const mcu_pin_obj_t pin_PF14 = PIN(5, 14, NO_ADC); // 144 only 
+const mcu_pin_obj_t pin_PF15 = PIN(5, 15, NO_ADC); // 144 only 
+
+const mcu_pin_obj_t pin_PG00 = PIN(6, 0, NO_ADC);   // 144 only 
+const mcu_pin_obj_t pin_PG01 = PIN(6, 1, NO_ADC);   // 144 only 
+
+const mcu_pin_obj_t pin_PE07 = PIN(4, 7, NO_ADC);
+const mcu_pin_obj_t pin_PE08 = PIN(4, 8, NO_ADC);
+const mcu_pin_obj_t pin_PE09 = PIN(4, 9, NO_ADC);
+const mcu_pin_obj_t pin_PE10 = PIN(4, 10, NO_ADC);
+const mcu_pin_obj_t pin_PE11 = PIN(4, 11, NO_ADC);
+const mcu_pin_obj_t pin_PE12 = PIN(4, 12, NO_ADC);
+const mcu_pin_obj_t pin_PE13 = PIN(4, 13, NO_ADC);
+const mcu_pin_obj_t pin_PE14 = PIN(4, 14, NO_ADC);
+const mcu_pin_obj_t pin_PE15 = PIN(4, 15, NO_ADC);
+
+const mcu_pin_obj_t pin_PB10 = PIN(1, 10, NO_ADC);
+const mcu_pin_obj_t pin_PB11 = PIN(1, 11, NO_ADC); // 144 only
+const mcu_pin_obj_t pin_PB12 = PIN(1, 12, NO_ADC);
+const mcu_pin_obj_t pin_PB13 = PIN(1, 13, NO_ADC);
+const mcu_pin_obj_t pin_PB14 = PIN(1, 14, NO_ADC);
+const mcu_pin_obj_t pin_PB15 = PIN(1, 15, NO_ADC);
+
+const mcu_pin_obj_t pin_PD08 = PIN(3, 8, NO_ADC);
+const mcu_pin_obj_t pin_PD09 = PIN(3, 9, NO_ADC);
+const mcu_pin_obj_t pin_PD10 = PIN(3, 10, NO_ADC);
+const mcu_pin_obj_t pin_PD11 = PIN(3, 11, NO_ADC);
+const mcu_pin_obj_t pin_PD12 = PIN(3, 12, NO_ADC);
+const mcu_pin_obj_t pin_PD13 = PIN(3, 13, NO_ADC);
+const mcu_pin_obj_t pin_PD14 = PIN(3, 14, NO_ADC);
+const mcu_pin_obj_t pin_PD15 = PIN(3, 15, NO_ADC);
+
+const mcu_pin_obj_t pin_PG02 = PIN(6, 2, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG03 = PIN(6, 3, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG04 = PIN(6, 4, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG05 = PIN(6, 5, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG06 = PIN(6, 6, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG07 = PIN(6, 7, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG08 = PIN(6, 8, NO_ADC);  // 144 only
+
+const mcu_pin_obj_t pin_PC06 = PIN(2, 6, NO_ADC);
+const mcu_pin_obj_t pin_PC07 = PIN(2, 7, NO_ADC);
+const mcu_pin_obj_t pin_PC08 = PIN(2, 8, NO_ADC);
+const mcu_pin_obj_t pin_PC09 = PIN(2, 9, NO_ADC);
+
+const mcu_pin_obj_t pin_PA08 = PIN(0, 8, NO_ADC);
+const mcu_pin_obj_t pin_PA09 = PIN(0, 9, NO_ADC);
+const mcu_pin_obj_t pin_PA10 = PIN(0, 10, NO_ADC);
+const mcu_pin_obj_t pin_PA11 = PIN(0, 11, NO_ADC);
+const mcu_pin_obj_t pin_PA12 = PIN(0, 12, NO_ADC);
+const mcu_pin_obj_t pin_PA13 = PIN(0, 13, NO_ADC);
+const mcu_pin_obj_t pin_PA14 = PIN(0, 14, NO_ADC);
+const mcu_pin_obj_t pin_PA15 = PIN(0, 15, NO_ADC);
+
+const mcu_pin_obj_t pin_PC10 = PIN(2, 10, NO_ADC);
+const mcu_pin_obj_t pin_PC11 = PIN(2, 11, NO_ADC);
+const mcu_pin_obj_t pin_PC12 = PIN(2, 12, NO_ADC);
+
+const mcu_pin_obj_t pin_PD00 = PIN(3, 0, NO_ADC);
+const mcu_pin_obj_t pin_PD01 = PIN(3, 1, NO_ADC);
+const mcu_pin_obj_t pin_PD02 = PIN(3, 2, NO_ADC);
+const mcu_pin_obj_t pin_PD03 = PIN(3, 3, NO_ADC);
+const mcu_pin_obj_t pin_PD04 = PIN(3, 4, NO_ADC);
+const mcu_pin_obj_t pin_PD05 = PIN(3, 5, NO_ADC);
+const mcu_pin_obj_t pin_PD06 = PIN(3, 6, NO_ADC);
+const mcu_pin_obj_t pin_PD07 = PIN(3, 7, NO_ADC);
+
+const mcu_pin_obj_t pin_PG09 = PIN(6, 9, NO_ADC);  // 144 only
+const mcu_pin_obj_t pin_PG10 = PIN(6, 10, NO_ADC); // 144 only
+const mcu_pin_obj_t pin_PG11 = PIN(6, 11, NO_ADC); // 144 only
+const mcu_pin_obj_t pin_PG12 = PIN(6, 12, NO_ADC); // 144 only
+const mcu_pin_obj_t pin_PG13 = PIN(6, 13, NO_ADC); // 144 only
+const mcu_pin_obj_t pin_PG14 = PIN(6, 14, NO_ADC); // 144 only
+const mcu_pin_obj_t pin_PG15 = PIN(6, 15, NO_ADC); // 144 only
+
+const mcu_pin_obj_t pin_PB03 = PIN(1, 3, NO_ADC);
+const mcu_pin_obj_t pin_PB04 = PIN(1, 4, NO_ADC);
+const mcu_pin_obj_t pin_PB05 = PIN(1, 5, NO_ADC);
+const mcu_pin_obj_t pin_PB06 = PIN(1, 6, NO_ADC);
+const mcu_pin_obj_t pin_PB07 = PIN(1, 7, NO_ADC);
+const mcu_pin_obj_t pin_PB08 = PIN(1, 8, NO_ADC);
+const mcu_pin_obj_t pin_PB09 = PIN(1, 9, NO_ADC);
+
+const mcu_pin_obj_t pin_PE00 = PIN(4, 0, NO_ADC);
+const mcu_pin_obj_t pin_PE01 = PIN(4, 1, NO_ADC);
diff --git a/ports/stm/peripherals/stm32f4/stm32f412zx/pins.h b/ports/stm/peripherals/stm32f4/stm32f412zx/pins.h
new file mode 100644
index 000000000..180f5c316
--- /dev/null
+++ b/ports/stm/peripherals/stm32f4/stm32f412zx/pins.h
@@ -0,0 +1,158 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F412ZG_PINS_H
+#define MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F412ZG_PINS_H
+
+//Pins in datasheet order: DocID028087 Rev 7 page 50. LQFP100 only
+//pg 50
+extern const mcu_pin_obj_t pin_PE02;
+extern const mcu_pin_obj_t pin_PE03;
+extern const mcu_pin_obj_t pin_PE04;
+extern const mcu_pin_obj_t pin_PE05;
+extern const mcu_pin_obj_t pin_PE06;
+extern const mcu_pin_obj_t pin_PC13;
+extern const mcu_pin_obj_t pin_PC14;
+//pg 51
+extern const mcu_pin_obj_t pin_PC15;
+extern const mcu_pin_obj_t pin_PF00;  // 144 only 
+extern const mcu_pin_obj_t pin_PF01;  // 144 only 
+extern const mcu_pin_obj_t pin_PF02;  // 144 only 
+extern const mcu_pin_obj_t pin_PF03;  // 144 only 
+extern const mcu_pin_obj_t pin_PF04;  // 144 only 
+extern const mcu_pin_obj_t pin_PF05;  // 144 only 
+extern const mcu_pin_obj_t pin_PF06;  // 144 only 
+extern const mcu_pin_obj_t pin_PF07;  // 144 only 
+extern const mcu_pin_obj_t pin_PF08;  // 144 only 
+extern const mcu_pin_obj_t pin_PF09;  // 144 only 
+extern const mcu_pin_obj_t pin_PF10; // 144 only 
+//pg 52
+extern const mcu_pin_obj_t pin_PC00;
+extern const mcu_pin_obj_t pin_PC01;
+extern const mcu_pin_obj_t pin_PC02;
+extern const mcu_pin_obj_t pin_PC03;
+extern const mcu_pin_obj_t pin_PA00;
+extern const mcu_pin_obj_t pin_PA01;
+extern const mcu_pin_obj_t pin_PA02;
+//pg 53
+extern const mcu_pin_obj_t pin_PA03;
+extern const mcu_pin_obj_t pin_PA04;
+extern const mcu_pin_obj_t pin_PA05;
+extern const mcu_pin_obj_t pin_PA06;
+extern const mcu_pin_obj_t pin_PA07;
+extern const mcu_pin_obj_t pin_PC04;
+//pg 54
+extern const mcu_pin_obj_t pin_PC05;
+extern const mcu_pin_obj_t pin_PB00;
+extern const mcu_pin_obj_t pin_PB01;
+extern const mcu_pin_obj_t pin_PB02;
+extern const mcu_pin_obj_t pin_PF11; // 144 only 
+extern const mcu_pin_obj_t pin_PF12; // 144 only 
+extern const mcu_pin_obj_t pin_PF13; // 144 only 
+extern const mcu_pin_obj_t pin_PF14; // 144 only 
+extern const mcu_pin_obj_t pin_PF15; // 144 only 
+extern const mcu_pin_obj_t pin_PG00;  // 144 only 
+extern const mcu_pin_obj_t pin_PG01;  // 144 only 
+//pg 55
+extern const mcu_pin_obj_t pin_PE07;
+extern const mcu_pin_obj_t pin_PE08;
+extern const mcu_pin_obj_t pin_PE09;
+extern const mcu_pin_obj_t pin_PE10;
+extern const mcu_pin_obj_t pin_PE11;
+extern const mcu_pin_obj_t pin_PE12;
+extern const mcu_pin_obj_t pin_PE13;
+extern const mcu_pin_obj_t pin_PE14;
+//pg 56
+extern const mcu_pin_obj_t pin_PE15;
+extern const mcu_pin_obj_t pin_PB10;
+extern const mcu_pin_obj_t pin_PB11; // 144 only
+extern const mcu_pin_obj_t pin_PB12;
+extern const mcu_pin_obj_t pin_PB13;
+//pg 57
+extern const mcu_pin_obj_t pin_PB14;
+extern const mcu_pin_obj_t pin_PB15;
+extern const mcu_pin_obj_t pin_PD08;
+extern const mcu_pin_obj_t pin_PD09;
+extern const mcu_pin_obj_t pin_PD10;
+extern const mcu_pin_obj_t pin_PD11;
+extern const mcu_pin_obj_t pin_PD12;
+//pg 58
+extern const mcu_pin_obj_t pin_PD13;
+extern const mcu_pin_obj_t pin_PD14;
+extern const mcu_pin_obj_t pin_PD15;
+extern const mcu_pin_obj_t pin_PG02;  // 144 only
+extern const mcu_pin_obj_t pin_PG03;  // 144 only
+extern const mcu_pin_obj_t pin_PG04;  // 144 only
+extern const mcu_pin_obj_t pin_PG05;  // 144 only
+extern const mcu_pin_obj_t pin_PG06;  // 144 only
+extern const mcu_pin_obj_t pin_PG07;  // 144 only
+extern const mcu_pin_obj_t pin_PG08;  // 144 only
+//pg 59
+extern const mcu_pin_obj_t pin_PC06;
+extern const mcu_pin_obj_t pin_PC07;
+extern const mcu_pin_obj_t pin_PC08;
+extern const mcu_pin_obj_t pin_PC09;
+extern const mcu_pin_obj_t pin_PA08;
+extern const mcu_pin_obj_t pin_PA09;
+extern const mcu_pin_obj_t pin_PA10;
+//pg 60
+extern const mcu_pin_obj_t pin_PA11;
+extern const mcu_pin_obj_t pin_PA12;
+extern const mcu_pin_obj_t pin_PA13;
+extern const mcu_pin_obj_t pin_PA14;
+extern const mcu_pin_obj_t pin_PA15;
+extern const mcu_pin_obj_t pin_PC10;
+extern const mcu_pin_obj_t pin_PC11;
+//pg 61
+extern const mcu_pin_obj_t pin_PC12;
+extern const mcu_pin_obj_t pin_PD00;
+extern const mcu_pin_obj_t pin_PD01;
+extern const mcu_pin_obj_t pin_PD02;
+extern const mcu_pin_obj_t pin_PD03;
+extern const mcu_pin_obj_t pin_PD04;
+extern const mcu_pin_obj_t pin_PD05;
+extern const mcu_pin_obj_t pin_PD06;
+extern const mcu_pin_obj_t pin_PD07;
+//pg 62
+extern const mcu_pin_obj_t pin_PG09;  // 144 only
+extern const mcu_pin_obj_t pin_PG10; // 144 only
+extern const mcu_pin_obj_t pin_PG11; // 144 only
+extern const mcu_pin_obj_t pin_PG12; // 144 only
+extern const mcu_pin_obj_t pin_PG13; // 144 only
+extern const mcu_pin_obj_t pin_PG14; // 144 only
+extern const mcu_pin_obj_t pin_PG15; // 144 only
+extern const mcu_pin_obj_t pin_PB03;
+extern const mcu_pin_obj_t pin_PB04;
+//pg 63
+extern const mcu_pin_obj_t pin_PB05;
+extern const mcu_pin_obj_t pin_PB06;
+extern const mcu_pin_obj_t pin_PB07;
+extern const mcu_pin_obj_t pin_PB08;
+extern const mcu_pin_obj_t pin_PB09;
+extern const mcu_pin_obj_t pin_PE00;
+extern const mcu_pin_obj_t pin_PE01;
+
+#endif // MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F412ZG_PINS_H
diff --git a/ports/stm/qstrdefsport.h b/ports/stm/qstrdefsport.h
new file mode 100644
index 000000000..3ba897069
--- /dev/null
+++ b/ports/stm/qstrdefsport.h
@@ -0,0 +1 @@
+// qstrs specific to this port
diff --git a/ports/stm/supervisor/cpu.s b/ports/stm/supervisor/cpu.s
new file mode 100755
index 000000000..9e6807a5e
--- /dev/null
+++ b/ports/stm/supervisor/cpu.s
@@ -0,0 +1,27 @@
+.syntax unified
+.cpu cortex-m4
+.thumb
+.text
+.align  2
+
+@ uint cpu_get_regs_and_sp(r0=uint regs[10])
+.global cpu_get_regs_and_sp
+.thumb
+.thumb_func
+.type   cpu_get_regs_and_sp, %function
+cpu_get_regs_and_sp:
+@ store registers into given array
+str     r4, [r0], #4
+str     r5, [r0], #4
+str     r6, [r0], #4
+str     r7, [r0], #4
+str     r8, [r0], #4
+str     r9, [r0], #4
+str     r10, [r0], #4
+str     r11, [r0], #4
+str     r12, [r0], #4
+str     r13, [r0], #4
+
+@ return the sp
+mov     r0, sp
+bx      lr
diff --git a/ports/stm/supervisor/internal_flash.c b/ports/stm/supervisor/internal_flash.c
new file mode 100644
index 000000000..046b26baf
--- /dev/null
+++ b/ports/stm/supervisor/internal_flash.c
@@ -0,0 +1,204 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013, 2014 Damien P. George
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "supervisor/internal_flash.h"
+
+#include <stdint.h>
+#include <string.h>
+
+#include "extmod/vfs.h"
+#include "extmod/vfs_fat.h"
+#include "py/mphal.h"
+#include "py/obj.h"
+#include "py/runtime.h"
+#include "lib/oofatfs/ff.h"
+
+#include "stm32f4xx_hal.h"
+
+typedef struct {
+    uint32_t base_address;
+    uint32_t sector_size;
+    uint32_t sector_count;
+} flash_layout_t;
+
+/*------------------------------------------------------------------*/
+/* Internal Flash API
+ *------------------------------------------------------------------*/
+
+static const flash_layout_t flash_layout[] = {
+    { 0x08000000, 0x04000, 4 },
+    { 0x08010000, 0x10000, 1 },
+    { 0x08020000, 0x20000, 3 },
+    #if defined(FLASH_SECTOR_8)
+    { 0x08080000, 0x20000, 4 },
+    #endif
+    #if defined(FLASH_SECTOR_12)
+    { 0x08100000, 0x04000, 4 },
+    { 0x08110000, 0x10000, 1 },
+    { 0x08120000, 0x20000, 7 },
+    #endif
+};
+
+static uint8_t sector_copy[0x4000] __attribute__((aligned(4)));
+
+//Return the sector of a given flash address. 
+uint32_t flash_get_sector_info(uint32_t addr, uint32_t *start_addr, uint32_t *size) {
+    if (addr >= flash_layout[0].base_address) {
+        uint32_t sector_index = 0;
+        for (uint8_t i = 0; i < MP_ARRAY_SIZE(flash_layout); ++i) {
+            for (uint8_t j = 0; j < flash_layout[i].sector_count; ++j) {
+                uint32_t sector_start_next = flash_layout[i].base_address
+                    + (j + 1) * flash_layout[i].sector_size;
+                if (addr < sector_start_next) {
+                    if (start_addr != NULL) {
+                        *start_addr = flash_layout[i].base_address
+                            + j * flash_layout[i].sector_size;
+                    }
+                    if (size != NULL) {
+                        *size = flash_layout[i].sector_size;
+                    }
+                    return sector_index;
+                }
+                ++sector_index;
+            }
+        }
+    }
+    return 0;
+}
+
+void supervisor_flash_init(void) {
+}
+
+uint32_t supervisor_flash_get_block_size(void) {
+    return FILESYSTEM_BLOCK_SIZE;
+}
+
+uint32_t supervisor_flash_get_block_count(void) {
+    return INTERNAL_FLASH_FILESYSTEM_NUM_BLOCKS;
+}
+
+void supervisor_flash_flush(void) {
+}
+
+static int32_t convert_block_to_flash_addr(uint32_t block) {
+    if (0 <= block && block < INTERNAL_FLASH_FILESYSTEM_NUM_BLOCKS) {
+        // a block in partition 1
+        return INTERNAL_FLASH_FILESYSTEM_START_ADDR + block * FILESYSTEM_BLOCK_SIZE;
+    }
+    // bad block
+    return -1;
+}
+
+mp_uint_t supervisor_flash_read_blocks(uint8_t *dest, uint32_t block, uint32_t num_blocks) {
+    int32_t src = convert_block_to_flash_addr(block);
+    if (src == -1) {
+        // bad block number
+        return false;
+    }
+    memcpy(dest, (uint8_t*) src, FILESYSTEM_BLOCK_SIZE*num_blocks);
+    return 0; // success
+}
+
+bool supervisor_flash_write_block(const uint8_t *src, uint32_t block) {
+    int32_t dest = convert_block_to_flash_addr(block);
+    if (dest == -1) {
+        // bad block number
+        mp_printf(&mp_plat_print, "BAD FLASH BLOCK ERROR");
+        return false;
+    }
+
+    // unlock flash
+    HAL_FLASH_Unlock();
+
+    // set up for erase
+    FLASH_EraseInitTypeDef EraseInitStruct;
+    EraseInitStruct.TypeErase = TYPEERASE_SECTORS;
+    EraseInitStruct.VoltageRange = VOLTAGE_RANGE_3; // voltage range needs to be 2.7V to 3.6V
+    // get the sector information
+    uint32_t sector_size;
+    uint32_t sector_start_addr;
+    EraseInitStruct.Sector = flash_get_sector_info(dest, &sector_start_addr, &sector_size);
+    EraseInitStruct.NbSectors = 1;
+    if (sector_size>0x4000) return false;
+
+    // copy the sector
+    memcpy(sector_copy,(void *)sector_start_addr,sector_size);
+
+    // // overwrite sector data
+    memcpy(sector_copy+(dest-sector_start_addr),src,FILESYSTEM_BLOCK_SIZE);
+
+    // find end address, subtract for number of sectors
+    // Shouldn't be required since blocks will always fit in a single sector, they should never overlap
+    //EraseInitStruct.NbSectors = flash_get_sector_info(dest + FILESYSTEM_BLOCK_SIZE - 1, NULL, NULL) - EraseInitStruct.Sector + 1;
+
+    // erase the sector
+    uint32_t SectorError = 0;
+    if (HAL_FLASHEx_Erase(&EraseInitStruct, &SectorError) != HAL_OK) {
+        // error occurred during sector erase
+        HAL_FLASH_Lock(); // lock the flash
+        mp_printf(&mp_plat_print, "FLASH SECTOR ERASE ERROR");
+        return false;
+    }
+
+    __HAL_FLASH_DATA_CACHE_DISABLE();
+    __HAL_FLASH_INSTRUCTION_CACHE_DISABLE();
+
+    __HAL_FLASH_DATA_CACHE_RESET();
+    __HAL_FLASH_INSTRUCTION_CACHE_RESET();
+
+    __HAL_FLASH_INSTRUCTION_CACHE_ENABLE();
+    __HAL_FLASH_DATA_CACHE_ENABLE();
+
+    // reprogram the sector
+    for (uint32_t i = 0; i < sector_size; i++) {
+        if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_BYTE, sector_start_addr, (uint64_t)sector_copy[i]) != HAL_OK) {
+            // error occurred during flash write
+            HAL_FLASH_Lock(); // lock the flash
+            mp_printf(&mp_plat_print, "FLASH WRITE ERROR");
+            return false;
+        }
+        sector_start_addr += 1;
+    }
+
+    // lock the flash
+    HAL_FLASH_Lock();
+
+    return true;
+}
+
+mp_uint_t supervisor_flash_write_blocks(const uint8_t *src, uint32_t block_num, uint32_t num_blocks) {
+
+    for (size_t i = 0; i < num_blocks; i++) {
+        if (!supervisor_flash_write_block(src + i * FILESYSTEM_BLOCK_SIZE, block_num + i)) {
+            return 1; // error
+        }
+    }
+    return 0; // success
+}
+
+void supervisor_flash_release_cache(void) {
+}
+
diff --git a/ports/stm/supervisor/internal_flash.h b/ports/stm/supervisor/internal_flash.h
new file mode 100644
index 000000000..9f16a799d
--- /dev/null
+++ b/ports/stm/supervisor/internal_flash.h
@@ -0,0 +1,68 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013, 2014 Damien P. George
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef MICROPY_INCLUDED_STM32F4_INTERNAL_FLASH_H
+#define MICROPY_INCLUDED_STM32F4_INTERNAL_FLASH_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "py/mpconfig.h"
+
+#ifdef STM32F401xE
+#define STM32_FLASH_SIZE 0x80000 //512KiB
+#define INTERNAL_FLASH_FILESYSTEM_SIZE 0xC000 //48KiB
+#endif
+
+#ifdef STM32F411xE
+#define STM32_FLASH_SIZE 0x80000 //512KiB
+#define INTERNAL_FLASH_FILESYSTEM_SIZE 0xC000 //48KiB
+#endif
+
+#ifdef STM32F412Zx
+#define STM32_FLASH_SIZE 0x100000 //1MB
+#define INTERNAL_FLASH_FILESYSTEM_SIZE 0xC000 //48KiB
+#endif
+
+#ifdef STM32F405xx
+#define STM32_FLASH_SIZE 0x100000 //1MB
+#define INTERNAL_FLASH_FILESYSTEM_SIZE 0xC000 //48KiB
+#endif
+
+#ifdef STM32F407xx
+#define STM32_FLASH_SIZE 0x100000 //1MB
+#define INTERNAL_FLASH_FILESYSTEM_SIZE 0xC000 //48KiB
+#endif
+
+#define STM32_FLASH_OFFSET 0x8000000 //All STM32 chips map to this flash location
+
+#define INTERNAL_FLASH_FILESYSTEM_START_ADDR 0x08004000
+#define INTERNAL_FLASH_FILESYSTEM_NUM_BLOCKS (INTERNAL_FLASH_FILESYSTEM_SIZE / FILESYSTEM_BLOCK_SIZE)
+
+#define INTERNAL_FLASH_SYSTICK_MASK     (0x1ff) // 512ms
+#define INTERNAL_FLASH_IDLE_TICK(tick)  (((tick) & INTERNAL_FLASH_SYSTICK_MASK) == 2)
+
+#endif  // MICROPY_INCLUDED_STM32F4_INTERNAL_FLASH_H
diff --git a/ports/stm/supervisor/internal_flash_root_pointers.h b/ports/stm/supervisor/internal_flash_root_pointers.h
new file mode 100644
index 000000000..7a8681bd9
--- /dev/null
+++ b/ports/stm/supervisor/internal_flash_root_pointers.h
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Scott Shawcroft for Adafruit Industries LLC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef MICROPY_INCLUDED_STM32F4_INTERNAL_FLASH_ROOT_POINTERS_H
+#define MICROPY_INCLUDED_STM32F4_INTERNAL_FLASH_ROOT_POINTERS_H
+
+#define FLASH_ROOT_POINTERS
+
+#endif  // MICROPY_INCLUDED_STM32F4_INTERNAL_FLASH_ROOT_POINTERS_H
diff --git a/ports/stm/supervisor/port.c b/ports/stm/supervisor/port.c
new file mode 100644
index 000000000..ecb4d3d15
--- /dev/null
+++ b/ports/stm/supervisor/port.c
@@ -0,0 +1,106 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdint.h>
+#include "supervisor/port.h"
+#include "boards/board.h"
+#include "tick.h"
+
+#include "common-hal/microcontroller/Pin.h"
+#include "common-hal/busio/I2C.h"
+#include "common-hal/busio/SPI.h"
+#include "common-hal/busio/UART.h"
+#include "common-hal/pulseio/PWMOut.h"
+#include "common-hal/pulseio/PulseOut.h"
+
+#include "stm32f4/clocks.h"
+#include "stm32f4/gpio.h"
+
+#include "stm32f4xx_hal.h"
+
+safe_mode_t port_init(void) {
+    HAL_Init();
+    __HAL_RCC_SYSCFG_CLK_ENABLE();
+    __HAL_RCC_PWR_CLK_ENABLE();
+
+    stm32f4_peripherals_clocks_init();
+    stm32f4_peripherals_gpio_init();
+
+    tick_init();
+
+    return NO_SAFE_MODE;
+}
+
+void reset_port(void) {
+    reset_all_pins();
+    i2c_reset();
+    spi_reset();
+    uart_reset();
+    pwmout_reset();
+    pulseout_reset();
+}
+
+void reset_to_bootloader(void) {
+
+}
+
+void reset_cpu(void) {
+    NVIC_SystemReset();
+}
+
+uint32_t *port_heap_get_bottom(void) {
+    return port_stack_get_limit();
+}
+
+uint32_t *port_heap_get_top(void) {
+    return port_stack_get_top();
+}
+
+uint32_t *port_stack_get_limit(void) {
+    return &_ebss;
+}
+
+uint32_t *port_stack_get_top(void) {
+    return &_estack;
+}
+
+extern uint32_t _ebss;
+// Place the word to save just after our BSS section that gets blanked.
+void port_set_saved_word(uint32_t value) {
+    _ebss = value;
+}
+
+uint32_t port_get_saved_word(void) {
+    return _ebss;
+}
+
+void HardFault_Handler(void) {
+    reset_into_safe_mode(HARD_CRASH);
+    while (true) {
+        asm("nop;");
+    }
+}
diff --git a/ports/stm/supervisor/qspi_flash.c b/ports/stm/supervisor/qspi_flash.c
new file mode 100644
index 000000000..f3915273b
--- /dev/null
+++ b/ports/stm/supervisor/qspi_flash.c
@@ -0,0 +1,162 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 hathach for Adafruit Industries
+ * Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "supervisor/spi_flash_api.h"
+
+#include <stdint.h>
+#include <string.h>
+
+#include "py/mpconfig.h" // for EXTERNAL_FLASH_QSPI_DUAL
+//#include "nrfx_qspi.h"
+
+//#include "shared-bindings/microcontroller/__init__.h"
+
+#include "supervisor/shared/external_flash/common_commands.h"
+#include "supervisor/shared/external_flash/qspi_flash.h"
+
+bool spi_flash_command(uint8_t command) {
+    // nrf_qspi_cinstr_conf_t cinstr_cfg = {
+    //     .opcode = command,
+    //     .length = 1,
+    //     .io2_level = true,
+    //     .io3_level = true,
+    //     .wipwait = false,
+    //     .wren = false
+    // };
+    return false; //nrfx_qspi_cinstr_xfer(&cinstr_cfg, NULL, NULL) == NRFX_SUCCESS;
+}
+
+bool spi_flash_read_command(uint8_t command, uint8_t* response, uint32_t length) {
+    // nrf_qspi_cinstr_conf_t cinstr_cfg = {
+    //     .opcode = command,
+    //     .length = length + 1,
+    //     .io2_level = true,
+    //     .io3_level = true,
+    //     .wipwait = false,
+    //     .wren = false
+    // };
+    // return nrfx_qspi_cinstr_xfer(&cinstr_cfg, NULL, response) == NRFX_SUCCESS;
+    return false;
+
+}
+
+bool spi_flash_write_command(uint8_t command, uint8_t* data, uint32_t length) {
+    // nrf_qspi_cinstr_conf_t cinstr_cfg = {
+    //     .opcode = command,
+    //     .length = length + 1,
+    //     .io2_level = true,
+    //     .io3_level = true,
+    //     .wipwait = false,
+    //     .wren = false // We do this manually.
+    // };
+    // return nrfx_qspi_cinstr_xfer(&cinstr_cfg, data, NULL) == NRFX_SUCCESS;
+    return false;
+}
+
+bool spi_flash_sector_command(uint8_t command, uint32_t address) {
+    // if (command != CMD_SECTOR_ERASE) {
+    //     return false;
+    // }
+    // return nrfx_qspi_erase(NRF_QSPI_ERASE_LEN_4KB, address) == NRFX_SUCCESS;
+    return false;
+}
+
+bool spi_flash_write_data(uint32_t address, uint8_t* data, uint32_t length) {
+    // return nrfx_qspi_write(data, length, address) == NRFX_SUCCESS;
+    return false;
+}
+
+bool spi_flash_read_data(uint32_t address, uint8_t* data, uint32_t length) {
+    // return nrfx_qspi_read(data, length, address) == NRFX_SUCCESS;
+    return false;
+}
+
+void spi_flash_init(void) {
+    // Init QSPI flash
+//     nrfx_qspi_config_t qspi_cfg = {
+//         .xip_offset = 0,
+//         .pins = {
+//             .sck_pin = MICROPY_QSPI_SCK,
+//             .csn_pin = MICROPY_QSPI_CS,
+//             .io0_pin = MICROPY_QSPI_DATA0,
+//             .io1_pin = NRF_QSPI_PIN_NOT_CONNECTED,
+//             .io2_pin = NRF_QSPI_PIN_NOT_CONNECTED,
+//             .io3_pin = NRF_QSPI_PIN_NOT_CONNECTED,
+
+//         },
+//         .prot_if = {
+//             .readoc = NRF_QSPI_READOC_FASTREAD,
+//             .writeoc = NRF_QSPI_WRITEOC_PP,
+//             .addrmode = NRF_QSPI_ADDRMODE_24BIT,
+//             .dpmconfig = false
+//         },
+//         .phy_if = {
+//             .sck_freq = NRF_QSPI_FREQ_32MDIV16, // Start at a slow 2MHz and speed up once we know what we're talking to.
+//             .sck_delay = 10,    // min time CS must stay high before going low again. in unit of 62.5 ns
+//             .spi_mode = NRF_QSPI_MODE_0,
+//             .dpmen = false
+//         },
+//         .irq_priority = 7,
+//     };
+
+// #if EXTERNAL_FLASH_QSPI_DUAL
+//     qspi_cfg.pins.io1_pin = MICROPY_QSPI_DATA1;
+//     qspi_cfg.prot_if.readoc = NRF_QSPI_READOC_READ2O;
+//     qspi_cfg.prot_if.writeoc = NRF_QSPI_WRITEOC_PP2O;
+// #else
+//     qspi_cfg.pins.io1_pin = MICROPY_QSPI_DATA1;
+//     qspi_cfg.pins.io2_pin = MICROPY_QSPI_DATA2;
+//     qspi_cfg.pins.io3_pin = MICROPY_QSPI_DATA3;
+//     qspi_cfg.prot_if.readoc = NRF_QSPI_READOC_READ4IO;
+//     qspi_cfg.prot_if.writeoc = NRF_QSPI_WRITEOC_PP4O;
+// #endif
+
+//     // No callback for blocking API
+//     nrfx_qspi_init(&qspi_cfg, NULL, NULL);
+}
+
+void spi_flash_init_device(const external_flash_device* device) {
+    // check_quad_enable(device);
+
+    // // Switch to single output line if the device doesn't support quad programs.
+    // if (!device->supports_qspi_writes) {
+    //     NRF_QSPI->IFCONFIG0 &= ~QSPI_IFCONFIG0_WRITEOC_Msk;
+    //     NRF_QSPI->IFCONFIG0 |= QSPI_IFCONFIG0_WRITEOC_PP << QSPI_IFCONFIG0_WRITEOC_Pos;
+    // }
+
+    // // Speed up as much as we can.
+    // // Start at 16 MHz and go down.
+    // // At 32 MHz GD25Q16C doesn't work reliably on Feather 52840, even though it should work up to 104 MHz.
+    // // sckfreq = 0 is 32 Mhz
+    // // sckfreq = 1 is 16 MHz, etc.
+    // uint8_t sckfreq = 1;
+    // while (32000000 / (sckfreq + 1) > device->max_clock_speed_mhz * 1000000 && sckfreq < 16) {
+    //     sckfreq += 1;
+    // }
+    // NRF_QSPI->IFCONFIG1 &= ~QSPI_IFCONFIG1_SCKFREQ_Msk;
+    // NRF_QSPI->IFCONFIG1 |=  sckfreq << QSPI_IFCONFIG1_SCKFREQ_Pos;
+}
diff --git a/ports/stm/supervisor/serial.c b/ports/stm/supervisor/serial.c
new file mode 100644
index 000000000..ce1366000
--- /dev/null
+++ b/ports/stm/supervisor/serial.c
@@ -0,0 +1,75 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017, 2018 Scott Shawcroft for Adafruit Industries
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/mphal.h"
+#include <string.h>
+#include "supervisor/serial.h"
+#include "stm32f4xx_hal.h"
+#include "stm32f4/gpio.h"
+
+UART_HandleTypeDef huart2;
+
+void serial_init(void) {
+    huart2.Instance = USART2;
+    huart2.Init.BaudRate = 115200;
+    huart2.Init.WordLength = UART_WORDLENGTH_8B;
+    huart2.Init.StopBits = UART_STOPBITS_1;
+    huart2.Init.Parity = UART_PARITY_NONE;
+    huart2.Init.Mode = UART_MODE_TX_RX;
+    huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
+    huart2.Init.OverSampling = UART_OVERSAMPLING_16;
+    if (HAL_UART_Init(&huart2) == HAL_OK)
+    {
+        stm32f4_peripherals_status_led(1,1);
+    }
+}
+
+bool serial_connected(void) {
+    return true;
+}
+
+char serial_read(void) {
+    uint8_t data;
+    HAL_UART_Receive(&huart2, &data, 1,500);
+    return data;
+}
+
+bool serial_bytes_available(void) {
+    return __HAL_UART_GET_FLAG(&huart2, UART_FLAG_RXNE);
+}
+
+void serial_write(const char* text) {
+    serial_write_substring(text, strlen(text));
+}
+
+void serial_write_substring(const char *text, uint32_t len) {
+    if (len == 0) {
+        return;
+    }
+    HAL_UART_Transmit(&huart2, (uint8_t*)text, len, 5000);
+}
+
diff --git a/ports/stm/supervisor/usb.c b/ports/stm/supervisor/usb.c
new file mode 100644
index 000000000..358c2de5b
--- /dev/null
+++ b/ports/stm/supervisor/usb.c
@@ -0,0 +1,112 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 hathach for Adafruit Industries
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+
+#include "tick.h"
+#include "supervisor/usb.h"
+#include "lib/utils/interrupt_char.h"
+#include "lib/mp-readline/readline.h"
+#include "stm32f4xx_hal.h"
+
+#include "py/mpconfig.h"
+
+#include "common-hal/microcontroller/Pin.h"
+
+STATIC void init_usb_vbus_sense(void) {
+
+#if (BOARD_NO_VBUS_SENSE)
+    // Disable VBUS sensing
+    #ifdef USB_OTG_GCCFG_VBDEN
+        USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBDEN;
+    #else
+        USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_NOVBUSSENS;
+        USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBUSBSEN;
+        USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBUSASEN;
+    #endif
+#else
+    // Enable VBUS hardware sensing
+    #ifdef USB_OTG_GCCFG_VBDEN
+        USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBDEN;
+    #else
+        USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_NOVBUSSENS;
+        USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBUSBSEN; // B Device sense
+    #endif
+#endif
+}
+
+void init_usb_hardware(void) {
+    //TODO: if future chips overload this with options, move to peripherals management. 
+
+    GPIO_InitTypeDef GPIO_InitStruct = {0};
+    /**USB_OTG_FS GPIO Configuration
+    PA10     ------> USB_OTG_FS_ID
+    PA11     ------> USB_OTG_FS_DM
+    PA12     ------> USB_OTG_FS_DP 
+    */
+    __HAL_RCC_GPIOA_CLK_ENABLE();
+
+      /* Configure DM DP Pins */
+    GPIO_InitStruct.Pin = GPIO_PIN_11 | GPIO_PIN_12;
+    GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+    never_reset_pin_number(0, 11);
+    never_reset_pin_number(0, 12);
+
+    /* Configure VBUS Pin */
+    GPIO_InitStruct.Pin = GPIO_PIN_9;
+    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+    never_reset_pin_number(0, 9);
+
+    /* This for ID line debug */
+    GPIO_InitStruct.Pin = GPIO_PIN_10;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
+    GPIO_InitStruct.Pull = GPIO_PULLUP;
+    GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
+    GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+    never_reset_pin_number(0, 10);
+
+#ifdef STM32F412Zx
+    /* Configure POWER_SWITCH IO pin (F412 ONLY)*/
+    GPIO_InitStruct.Pin = GPIO_PIN_8;
+    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);
+    never_reset_pin_number(0, 8);
+#endif
+    
+    /* Peripheral clock enable */
+    __HAL_RCC_USB_OTG_FS_CLK_DISABLE();
+    __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
+
+    init_usb_vbus_sense();
+}
diff --git a/ports/stm/system_stm32f4xx.c b/ports/stm/system_stm32f4xx.c
new file mode 100644
index 000000000..caa4f9caf
--- /dev/null
+++ b/ports/stm/system_stm32f4xx.c
@@ -0,0 +1,788 @@
+/*
+ * Taken from ST Cube library and modified.  See below for original header.
+ * 
+ * Modifications copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/**
+  ******************************************************************************
+  * @file    system_stm32f4xx.c
+  * @author  MCD Application Team
+  * @brief   CMSIS Cortex-M4 Device Peripheral Access Layer System Source File.
+  *
+  *   This file provides two functions and one global variable to be called from 
+  *   user application:
+  *      - SystemInit(): This function is called at startup just after reset and 
+  *                      before branch to main program. This call is made inside
+  *                      the "startup_stm32f4xx.s" file.
+  *
+  *      - SystemCoreClock variable: Contains the core clock (HCLK), it can be used
+  *                                  by the user application to setup the SysTick 
+  *                                  timer or configure other parameters.
+  *                                     
+  *      - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must
+  *                                 be called whenever the core clock is changed
+  *                                 during program execution.
+  *
+  *
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT 2017 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+
+/** @addtogroup CMSIS
+  * @{
+  */
+
+/** @addtogroup stm32f4xx_system
+  * @{
+  */  
+  
+/** @addtogroup STM32F4xx_System_Private_Includes
+  * @{
+  */
+
+
+#include "stm32f4xx.h"
+#include "py/mpconfig.h"
+
+#if !defined  (HSE_VALUE) 
+  #define HSE_VALUE    ((uint32_t)25000000) /*!< Default value of the External oscillator in Hz */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSI_VALUE)
+  #define HSI_VALUE    ((uint32_t)16000000) /*!< Value of the Internal oscillator in Hz*/
+#endif /* HSI_VALUE */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F4xx_System_Private_TypesDefinitions
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F4xx_System_Private_Defines
+  * @{
+  */
+
+/************************* Miscellaneous Configuration ************************/
+/*!< Uncomment the following line if you need to use external SRAM or SDRAM as data memory  */
+#if defined(STM32F405xx) || defined(STM32F415xx) || defined(STM32F407xx) || defined(STM32F417xx)\
+ || defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)\
+ || defined(STM32F469xx) || defined(STM32F479xx) || defined(STM32F412Zx) || defined(STM32F412Vx)
+/* #define DATA_IN_ExtSRAM */
+#endif /* STM32F40xxx || STM32F41xxx || STM32F42xxx || STM32F43xxx || STM32F469xx || STM32F479xx ||\
+          STM32F412Zx || STM32F412Vx */
+ 
+#if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)\
+ || defined(STM32F446xx) || defined(STM32F469xx) || defined(STM32F479xx)
+/* #define DATA_IN_ExtSDRAM */
+#endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx || STM32F446xx || STM32F469xx ||\
+          STM32F479xx */
+
+/*!< Uncomment the following line if you need to relocate your vector Table in
+     Internal SRAM. */
+/* #define VECT_TAB_SRAM */
+#define VECT_TAB_OFFSET  0x00 /*!< Vector Table base offset field. 
+                                   This value must be a multiple of 0x200. */
+/******************************************************************************/
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F4xx_System_Private_Macros
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F4xx_System_Private_Variables
+  * @{
+  */
+  /* This variable is updated in three ways:
+      1) by calling CMSIS function SystemCoreClockUpdate()
+      2) by calling HAL API function HAL_RCC_GetHCLKFreq()
+      3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency 
+         Note: If you use this function to configure the system clock; then there
+               is no need to call the 2 first functions listed above, since SystemCoreClock
+               variable is updated automatically.
+  */
+uint32_t SystemCoreClock = 16000000;
+const uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9};
+const uint8_t APBPrescTable[8]  = {0, 0, 0, 0, 1, 2, 3, 4};
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F4xx_System_Private_FunctionPrototypes
+  * @{
+  */
+
+#if defined (DATA_IN_ExtSRAM) || defined (DATA_IN_ExtSDRAM)
+  static void SystemInit_ExtMemCtl(void); 
+#endif /* DATA_IN_ExtSRAM || DATA_IN_ExtSDRAM */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F4xx_System_Private_Functions
+  * @{
+  */
+
+/**
+  * @brief  Setup the microcontroller system
+  *         Initialize the FPU setting, vector table location and External memory 
+  *         configuration.
+  * @param  None
+  * @retval None
+  */
+void SystemInit(void)
+{
+  /* FPU settings ------------------------------------------------------------*/
+  #if (__FPU_PRESENT == 1) && (__FPU_USED == 1)
+    SCB->CPACR |= ((3UL << 10*2)|(3UL << 11*2));  /* set CP10 and CP11 Full Access */
+  #endif
+  /* Reset the RCC clock configuration to the default reset state ------------*/
+  /* Set HSION bit */
+  RCC->CR |= (uint32_t)0x00000001;
+
+  /* Reset CFGR register */
+  RCC->CFGR = 0x00000000;
+
+  /* Reset HSEON, CSSON and PLLON bits */
+  RCC->CR &= (uint32_t)0xFEF6FFFF;
+
+  /* Reset PLLCFGR register */
+  RCC->PLLCFGR = 0x24003010;
+
+  /* Reset HSEBYP bit */
+  RCC->CR &= (uint32_t)0xFFFBFFFF;
+
+  /* Disable all interrupts */
+  RCC->CIR = 0x00000000;
+
+#if defined (DATA_IN_ExtSRAM) || defined (DATA_IN_ExtSDRAM)
+  SystemInit_ExtMemCtl(); 
+#endif /* DATA_IN_ExtSRAM || DATA_IN_ExtSDRAM */
+
+  /* Configure the Vector Table location add offset address ------------------*/
+#if !(BOARD_VTOR_DEFER) //only set VTOR if the bootloader hasn't already
+  #ifdef VECT_TAB_SRAM
+    SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM */
+  #else
+    SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH */
+  #endif
+#endif
+}
+
+/**
+   * @brief  Update SystemCoreClock variable according to Clock Register Values.
+  *         The SystemCoreClock variable contains the core clock (HCLK), it can
+  *         be used by the user application to setup the SysTick timer or configure
+  *         other parameters.
+  *           
+  * @note   Each time the core clock (HCLK) changes, this function must be called
+  *         to update SystemCoreClock variable value. Otherwise, any configuration
+  *         based on this variable will be incorrect.         
+  *     
+  * @note   - The system frequency computed by this function is not the real 
+  *           frequency in the chip. It is calculated based on the predefined 
+  *           constant and the selected clock source:
+  *             
+  *           - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*)
+  *                                              
+  *           - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**)
+  *                          
+  *           - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**) 
+  *             or HSI_VALUE(*) multiplied/divided by the PLL factors.
+  *         
+  *         (*) HSI_VALUE is a constant defined in stm32f4xx_hal_conf.h file (default value
+  *             16 MHz) but the real value may vary depending on the variations
+  *             in voltage and temperature.   
+  *    
+  *         (**) HSE_VALUE is a constant defined in stm32f4xx_hal_conf.h file (its value
+  *              depends on the application requirements), user has to ensure that HSE_VALUE
+  *              is same as the real frequency of the crystal used. Otherwise, this function
+  *              may have wrong result.
+  *                
+  *         - The result of this function could be not correct when using fractional
+  *           value for HSE crystal.
+  *     
+  * @param  None
+  * @retval None
+  */
+void SystemCoreClockUpdate(void)
+{
+  uint32_t tmp = 0, pllvco = 0, pllp = 2, pllsource = 0, pllm = 2;
+  
+  /* Get SYSCLK source -------------------------------------------------------*/
+  tmp = RCC->CFGR & RCC_CFGR_SWS;
+
+  switch (tmp)
+  {
+    case 0x00:  /* HSI used as system clock source */
+      SystemCoreClock = HSI_VALUE;
+      break;
+    case 0x04:  /* HSE used as system clock source */
+      SystemCoreClock = HSE_VALUE;
+      break;
+    case 0x08:  /* PLL used as system clock source */
+
+      /* PLL_VCO = (HSE_VALUE or HSI_VALUE / PLL_M) * PLL_N
+         SYSCLK = PLL_VCO / PLL_P
+         */    
+      pllsource = (RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC) >> 22;
+      pllm = RCC->PLLCFGR & RCC_PLLCFGR_PLLM;
+      
+      if (pllsource != 0)
+      {
+        /* HSE used as PLL clock source */
+        pllvco = (HSE_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> 6);
+      }
+      else
+      {
+        /* HSI used as PLL clock source */
+        pllvco = (HSI_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> 6);
+      }
+
+      pllp = (((RCC->PLLCFGR & RCC_PLLCFGR_PLLP) >>16) + 1 ) *2;
+      SystemCoreClock = pllvco/pllp;
+      break;
+    default:
+      SystemCoreClock = HSI_VALUE;
+      break;
+  }
+  /* Compute HCLK frequency --------------------------------------------------*/
+  /* Get HCLK prescaler */
+  tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4)];
+  /* HCLK frequency */
+  SystemCoreClock >>= tmp;
+}
+
+#if defined (DATA_IN_ExtSRAM) && defined (DATA_IN_ExtSDRAM)
+#if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)\
+ || defined(STM32F469xx) || defined(STM32F479xx)
+/**
+  * @brief  Setup the external memory controller.
+  *         Called in startup_stm32f4xx.s before jump to main.
+  *         This function configures the external memories (SRAM/SDRAM)
+  *         This SRAM/SDRAM will be used as program data memory (including heap and stack).
+  * @param  None
+  * @retval None
+  */
+void SystemInit_ExtMemCtl(void)
+{
+  __IO uint32_t tmp = 0x00;
+
+  register uint32_t tmpreg = 0, timeout = 0xFFFF;
+  register __IO uint32_t index;
+
+  /* Enable GPIOC, GPIOD, GPIOE, GPIOF, GPIOG, GPIOH and GPIOI interface clock */
+  RCC->AHB1ENR |= 0x000001F8;
+
+  /* Delay after an RCC peripheral clock enabling */
+  tmp = READ_BIT(RCC->AHB1ENR, RCC_AHB1ENR_GPIOCEN);
+  
+  /* Connect PDx pins to FMC Alternate function */
+  GPIOD->AFR[0]  = 0x00CCC0CC;
+  GPIOD->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PDx pins in Alternate function mode */  
+  GPIOD->MODER   = 0xAAAA0A8A;
+  /* Configure PDx pins speed to 100 MHz */  
+  GPIOD->OSPEEDR = 0xFFFF0FCF;
+  /* Configure PDx pins Output type to push-pull */  
+  GPIOD->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PDx pins */ 
+  GPIOD->PUPDR   = 0x00000000;
+
+  /* Connect PEx pins to FMC Alternate function */
+  GPIOE->AFR[0]  = 0xC00CC0CC;
+  GPIOE->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PEx pins in Alternate function mode */ 
+  GPIOE->MODER   = 0xAAAA828A;
+  /* Configure PEx pins speed to 100 MHz */ 
+  GPIOE->OSPEEDR = 0xFFFFC3CF;
+  /* Configure PEx pins Output type to push-pull */  
+  GPIOE->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PEx pins */ 
+  GPIOE->PUPDR   = 0x00000000;
+  
+  /* Connect PFx pins to FMC Alternate function */
+  GPIOF->AFR[0]  = 0xCCCCCCCC;
+  GPIOF->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PFx pins in Alternate function mode */   
+  GPIOF->MODER   = 0xAA800AAA;
+  /* Configure PFx pins speed to 50 MHz */ 
+  GPIOF->OSPEEDR = 0xAA800AAA;
+  /* Configure PFx pins Output type to push-pull */  
+  GPIOF->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PFx pins */ 
+  GPIOF->PUPDR   = 0x00000000;
+
+  /* Connect PGx pins to FMC Alternate function */
+  GPIOG->AFR[0]  = 0xCCCCCCCC;
+  GPIOG->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PGx pins in Alternate function mode */ 
+  GPIOG->MODER   = 0xAAAAAAAA;
+  /* Configure PGx pins speed to 50 MHz */ 
+  GPIOG->OSPEEDR = 0xAAAAAAAA;
+  /* Configure PGx pins Output type to push-pull */  
+  GPIOG->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PGx pins */ 
+  GPIOG->PUPDR   = 0x00000000;
+  
+  /* Connect PHx pins to FMC Alternate function */
+  GPIOH->AFR[0]  = 0x00C0CC00;
+  GPIOH->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PHx pins in Alternate function mode */ 
+  GPIOH->MODER   = 0xAAAA08A0;
+  /* Configure PHx pins speed to 50 MHz */ 
+  GPIOH->OSPEEDR = 0xAAAA08A0;
+  /* Configure PHx pins Output type to push-pull */  
+  GPIOH->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PHx pins */ 
+  GPIOH->PUPDR   = 0x00000000;
+  
+  /* Connect PIx pins to FMC Alternate function */
+  GPIOI->AFR[0]  = 0xCCCCCCCC;
+  GPIOI->AFR[1]  = 0x00000CC0;
+  /* Configure PIx pins in Alternate function mode */ 
+  GPIOI->MODER   = 0x0028AAAA;
+  /* Configure PIx pins speed to 50 MHz */ 
+  GPIOI->OSPEEDR = 0x0028AAAA;
+  /* Configure PIx pins Output type to push-pull */  
+  GPIOI->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PIx pins */ 
+  GPIOI->PUPDR   = 0x00000000;
+  
+/*-- FMC Configuration -------------------------------------------------------*/
+  /* Enable the FMC interface clock */
+  RCC->AHB3ENR |= 0x00000001;
+  /* Delay after an RCC peripheral clock enabling */
+  tmp = READ_BIT(RCC->AHB3ENR, RCC_AHB3ENR_FMCEN);
+
+  FMC_Bank5_6->SDCR[0] = 0x000019E4;
+  FMC_Bank5_6->SDTR[0] = 0x01115351;      
+  
+  /* SDRAM initialization sequence */
+  /* Clock enable command */
+  FMC_Bank5_6->SDCMR = 0x00000011; 
+  tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  while((tmpreg != 0) && (timeout-- > 0))
+  {
+    tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  }
+
+  /* Delay */
+  for (index = 0; index<1000; index++);
+  
+  /* PALL command */
+  FMC_Bank5_6->SDCMR = 0x00000012;           
+  timeout = 0xFFFF;
+  while((tmpreg != 0) && (timeout-- > 0))
+  {
+    tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  }
+  
+  /* Auto refresh command */
+  FMC_Bank5_6->SDCMR = 0x00000073;
+  timeout = 0xFFFF;
+  while((tmpreg != 0) && (timeout-- > 0))
+  {
+    tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  }
+ 
+  /* MRD register program */
+  FMC_Bank5_6->SDCMR = 0x00046014;
+  timeout = 0xFFFF;
+  while((tmpreg != 0) && (timeout-- > 0))
+  {
+    tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  } 
+  
+  /* Set refresh count */
+  tmpreg = FMC_Bank5_6->SDRTR;
+  FMC_Bank5_6->SDRTR = (tmpreg | (0x0000027C<<1));
+  
+  /* Disable write protection */
+  tmpreg = FMC_Bank5_6->SDCR[0]; 
+  FMC_Bank5_6->SDCR[0] = (tmpreg & 0xFFFFFDFF);
+
+#if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)
+  /* Configure and enable Bank1_SRAM2 */
+  FMC_Bank1->BTCR[2]  = 0x00001011;
+  FMC_Bank1->BTCR[3]  = 0x00000201;
+  FMC_Bank1E->BWTR[2] = 0x0fffffff;
+#endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx */ 
+#if defined(STM32F469xx) || defined(STM32F479xx)
+  /* Configure and enable Bank1_SRAM2 */
+  FMC_Bank1->BTCR[2]  = 0x00001091;
+  FMC_Bank1->BTCR[3]  = 0x00110212;
+  FMC_Bank1E->BWTR[2] = 0x0fffffff;
+#endif /* STM32F469xx || STM32F479xx */
+
+  (void)(tmp); 
+}
+#endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx || STM32F469xx || STM32F479xx */
+#elif defined (DATA_IN_ExtSRAM) || defined (DATA_IN_ExtSDRAM)
+/**
+  * @brief  Setup the external memory controller.
+  *         Called in startup_stm32f4xx.s before jump to main.
+  *         This function configures the external memories (SRAM/SDRAM)
+  *         This SRAM/SDRAM will be used as program data memory (including heap and stack).
+  * @param  None
+  * @retval None
+  */
+void SystemInit_ExtMemCtl(void)
+{
+  __IO uint32_t tmp = 0x00;
+#if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)\
+ || defined(STM32F446xx) || defined(STM32F469xx) || defined(STM32F479xx)
+#if defined (DATA_IN_ExtSDRAM)
+  register uint32_t tmpreg = 0, timeout = 0xFFFF;
+  register __IO uint32_t index;
+
+#if defined(STM32F446xx)
+  /* Enable GPIOA, GPIOC, GPIOD, GPIOE, GPIOF, GPIOG interface
+      clock */
+  RCC->AHB1ENR |= 0x0000007D;
+#else
+  /* Enable GPIOC, GPIOD, GPIOE, GPIOF, GPIOG, GPIOH and GPIOI interface 
+      clock */
+  RCC->AHB1ENR |= 0x000001F8;
+#endif /* STM32F446xx */  
+  /* Delay after an RCC peripheral clock enabling */
+  tmp = READ_BIT(RCC->AHB1ENR, RCC_AHB1ENR_GPIOCEN);
+  
+#if defined(STM32F446xx)
+  /* Connect PAx pins to FMC Alternate function */
+  GPIOA->AFR[0]  |= 0xC0000000;
+  GPIOA->AFR[1]  |= 0x00000000;
+  /* Configure PDx pins in Alternate function mode */
+  GPIOA->MODER   |= 0x00008000;
+  /* Configure PDx pins speed to 50 MHz */
+  GPIOA->OSPEEDR |= 0x00008000;
+  /* Configure PDx pins Output type to push-pull */
+  GPIOA->OTYPER  |= 0x00000000;
+  /* No pull-up, pull-down for PDx pins */
+  GPIOA->PUPDR   |= 0x00000000;
+
+  /* Connect PCx pins to FMC Alternate function */
+  GPIOC->AFR[0]  |= 0x00CC0000;
+  GPIOC->AFR[1]  |= 0x00000000;
+  /* Configure PDx pins in Alternate function mode */
+  GPIOC->MODER   |= 0x00000A00;
+  /* Configure PDx pins speed to 50 MHz */
+  GPIOC->OSPEEDR |= 0x00000A00;
+  /* Configure PDx pins Output type to push-pull */
+  GPIOC->OTYPER  |= 0x00000000;
+  /* No pull-up, pull-down for PDx pins */
+  GPIOC->PUPDR   |= 0x00000000;
+#endif /* STM32F446xx */
+
+  /* Connect PDx pins to FMC Alternate function */
+  GPIOD->AFR[0]  = 0x000000CC;
+  GPIOD->AFR[1]  = 0xCC000CCC;
+  /* Configure PDx pins in Alternate function mode */  
+  GPIOD->MODER   = 0xA02A000A;
+  /* Configure PDx pins speed to 50 MHz */  
+  GPIOD->OSPEEDR = 0xA02A000A;
+  /* Configure PDx pins Output type to push-pull */  
+  GPIOD->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PDx pins */ 
+  GPIOD->PUPDR   = 0x00000000;
+
+  /* Connect PEx pins to FMC Alternate function */
+  GPIOE->AFR[0]  = 0xC00000CC;
+  GPIOE->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PEx pins in Alternate function mode */ 
+  GPIOE->MODER   = 0xAAAA800A;
+  /* Configure PEx pins speed to 50 MHz */ 
+  GPIOE->OSPEEDR = 0xAAAA800A;
+  /* Configure PEx pins Output type to push-pull */  
+  GPIOE->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PEx pins */ 
+  GPIOE->PUPDR   = 0x00000000;
+
+  /* Connect PFx pins to FMC Alternate function */
+  GPIOF->AFR[0]  = 0xCCCCCCCC;
+  GPIOF->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PFx pins in Alternate function mode */   
+  GPIOF->MODER   = 0xAA800AAA;
+  /* Configure PFx pins speed to 50 MHz */ 
+  GPIOF->OSPEEDR = 0xAA800AAA;
+  /* Configure PFx pins Output type to push-pull */  
+  GPIOF->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PFx pins */ 
+  GPIOF->PUPDR   = 0x00000000;
+
+  /* Connect PGx pins to FMC Alternate function */
+  GPIOG->AFR[0]  = 0xCCCCCCCC;
+  GPIOG->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PGx pins in Alternate function mode */ 
+  GPIOG->MODER   = 0xAAAAAAAA;
+  /* Configure PGx pins speed to 50 MHz */ 
+  GPIOG->OSPEEDR = 0xAAAAAAAA;
+  /* Configure PGx pins Output type to push-pull */  
+  GPIOG->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PGx pins */ 
+  GPIOG->PUPDR   = 0x00000000;
+
+#if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)\
+ || defined(STM32F469xx) || defined(STM32F479xx)  
+  /* Connect PHx pins to FMC Alternate function */
+  GPIOH->AFR[0]  = 0x00C0CC00;
+  GPIOH->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PHx pins in Alternate function mode */ 
+  GPIOH->MODER   = 0xAAAA08A0;
+  /* Configure PHx pins speed to 50 MHz */ 
+  GPIOH->OSPEEDR = 0xAAAA08A0;
+  /* Configure PHx pins Output type to push-pull */  
+  GPIOH->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PHx pins */ 
+  GPIOH->PUPDR   = 0x00000000;
+  
+  /* Connect PIx pins to FMC Alternate function */
+  GPIOI->AFR[0]  = 0xCCCCCCCC;
+  GPIOI->AFR[1]  = 0x00000CC0;
+  /* Configure PIx pins in Alternate function mode */ 
+  GPIOI->MODER   = 0x0028AAAA;
+  /* Configure PIx pins speed to 50 MHz */ 
+  GPIOI->OSPEEDR = 0x0028AAAA;
+  /* Configure PIx pins Output type to push-pull */  
+  GPIOI->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PIx pins */ 
+  GPIOI->PUPDR   = 0x00000000;
+#endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx || STM32F469xx || STM32F479xx */
+  
+/*-- FMC Configuration -------------------------------------------------------*/
+  /* Enable the FMC interface clock */
+  RCC->AHB3ENR |= 0x00000001;
+  /* Delay after an RCC peripheral clock enabling */
+  tmp = READ_BIT(RCC->AHB3ENR, RCC_AHB3ENR_FMCEN);
+
+  /* Configure and enable SDRAM bank1 */
+#if defined(STM32F446xx)
+  FMC_Bank5_6->SDCR[0] = 0x00001954;
+#else  
+  FMC_Bank5_6->SDCR[0] = 0x000019E4;
+#endif /* STM32F446xx */
+  FMC_Bank5_6->SDTR[0] = 0x01115351;      
+  
+  /* SDRAM initialization sequence */
+  /* Clock enable command */
+  FMC_Bank5_6->SDCMR = 0x00000011; 
+  tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  while((tmpreg != 0) && (timeout-- > 0))
+  {
+    tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  }
+
+  /* Delay */
+  for (index = 0; index<1000; index++);
+  
+  /* PALL command */
+  FMC_Bank5_6->SDCMR = 0x00000012;           
+  timeout = 0xFFFF;
+  while((tmpreg != 0) && (timeout-- > 0))
+  {
+    tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  }
+  
+  /* Auto refresh command */
+#if defined(STM32F446xx)
+  FMC_Bank5_6->SDCMR = 0x000000F3;
+#else  
+  FMC_Bank5_6->SDCMR = 0x00000073;
+#endif /* STM32F446xx */
+  timeout = 0xFFFF;
+  while((tmpreg != 0) && (timeout-- > 0))
+  {
+    tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  }
+ 
+  /* MRD register program */
+#if defined(STM32F446xx)
+  FMC_Bank5_6->SDCMR = 0x00044014;
+#else  
+  FMC_Bank5_6->SDCMR = 0x00046014;
+#endif /* STM32F446xx */
+  timeout = 0xFFFF;
+  while((tmpreg != 0) && (timeout-- > 0))
+  {
+    tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  } 
+  
+  /* Set refresh count */
+  tmpreg = FMC_Bank5_6->SDRTR;
+#if defined(STM32F446xx)
+  FMC_Bank5_6->SDRTR = (tmpreg | (0x0000050C<<1));
+#else    
+  FMC_Bank5_6->SDRTR = (tmpreg | (0x0000027C<<1));
+#endif /* STM32F446xx */
+  
+  /* Disable write protection */
+  tmpreg = FMC_Bank5_6->SDCR[0]; 
+  FMC_Bank5_6->SDCR[0] = (tmpreg & 0xFFFFFDFF);
+#endif /* DATA_IN_ExtSDRAM */
+#endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx || STM32F446xx || STM32F469xx || STM32F479xx */
+
+#if defined(STM32F405xx) || defined(STM32F415xx) || defined(STM32F407xx) || defined(STM32F417xx)\
+ || defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)\
+ || defined(STM32F469xx) || defined(STM32F479xx) || defined(STM32F412Zx) || defined(STM32F412Vx)
+
+#if defined(DATA_IN_ExtSRAM)
+/*-- GPIOs Configuration -----------------------------------------------------*/
+   /* Enable GPIOD, GPIOE, GPIOF and GPIOG interface clock */
+  RCC->AHB1ENR   |= 0x00000078;
+  /* Delay after an RCC peripheral clock enabling */
+  tmp = READ_BIT(RCC->AHB1ENR, RCC_AHB1ENR_GPIODEN);
+  
+  /* Connect PDx pins to FMC Alternate function */
+  GPIOD->AFR[0]  = 0x00CCC0CC;
+  GPIOD->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PDx pins in Alternate function mode */  
+  GPIOD->MODER   = 0xAAAA0A8A;
+  /* Configure PDx pins speed to 100 MHz */  
+  GPIOD->OSPEEDR = 0xFFFF0FCF;
+  /* Configure PDx pins Output type to push-pull */  
+  GPIOD->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PDx pins */ 
+  GPIOD->PUPDR   = 0x00000000;
+
+  /* Connect PEx pins to FMC Alternate function */
+  GPIOE->AFR[0]  = 0xC00CC0CC;
+  GPIOE->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PEx pins in Alternate function mode */ 
+  GPIOE->MODER   = 0xAAAA828A;
+  /* Configure PEx pins speed to 100 MHz */ 
+  GPIOE->OSPEEDR = 0xFFFFC3CF;
+  /* Configure PEx pins Output type to push-pull */  
+  GPIOE->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PEx pins */ 
+  GPIOE->PUPDR   = 0x00000000;
+
+  /* Connect PFx pins to FMC Alternate function */
+  GPIOF->AFR[0]  = 0x00CCCCCC;
+  GPIOF->AFR[1]  = 0xCCCC0000;
+  /* Configure PFx pins in Alternate function mode */   
+  GPIOF->MODER   = 0xAA000AAA;
+  /* Configure PFx pins speed to 100 MHz */ 
+  GPIOF->OSPEEDR = 0xFF000FFF;
+  /* Configure PFx pins Output type to push-pull */  
+  GPIOF->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PFx pins */ 
+  GPIOF->PUPDR   = 0x00000000;
+
+  /* Connect PGx pins to FMC Alternate function */
+  GPIOG->AFR[0]  = 0x00CCCCCC;
+  GPIOG->AFR[1]  = 0x000000C0;
+  /* Configure PGx pins in Alternate function mode */ 
+  GPIOG->MODER   = 0x00085AAA;
+  /* Configure PGx pins speed to 100 MHz */ 
+  GPIOG->OSPEEDR = 0x000CAFFF;
+  /* Configure PGx pins Output type to push-pull */  
+  GPIOG->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PGx pins */ 
+  GPIOG->PUPDR   = 0x00000000;
+  
+/*-- FMC/FSMC Configuration --------------------------------------------------*/
+  /* Enable the FMC/FSMC interface clock */
+  RCC->AHB3ENR         |= 0x00000001;
+
+#if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)
+  /* Delay after an RCC peripheral clock enabling */
+  tmp = READ_BIT(RCC->AHB3ENR, RCC_AHB3ENR_FMCEN);
+  /* Configure and enable Bank1_SRAM2 */
+  FMC_Bank1->BTCR[2]  = 0x00001011;
+  FMC_Bank1->BTCR[3]  = 0x00000201;
+  FMC_Bank1E->BWTR[2] = 0x0fffffff;
+#endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx */ 
+#if defined(STM32F469xx) || defined(STM32F479xx)
+  /* Delay after an RCC peripheral clock enabling */
+  tmp = READ_BIT(RCC->AHB3ENR, RCC_AHB3ENR_FMCEN);
+  /* Configure and enable Bank1_SRAM2 */
+  FMC_Bank1->BTCR[2]  = 0x00001091;
+  FMC_Bank1->BTCR[3]  = 0x00110212;
+  FMC_Bank1E->BWTR[2] = 0x0fffffff;
+#endif /* STM32F469xx || STM32F479xx */
+#if defined(STM32F405xx) || defined(STM32F415xx) || defined(STM32F407xx)|| defined(STM32F417xx)\
+   || defined(STM32F412Zx) || defined(STM32F412Vx)
+  /* Delay after an RCC peripheral clock enabling */
+  tmp = READ_BIT(RCC->AHB3ENR, RCC_AHB3ENR_FSMCEN);
+  /* Configure and enable Bank1_SRAM2 */
+  FSMC_Bank1->BTCR[2]  = 0x00001011;
+  FSMC_Bank1->BTCR[3]  = 0x00000201;
+  FSMC_Bank1E->BWTR[2] = 0x0FFFFFFF;
+#endif /* STM32F405xx || STM32F415xx || STM32F407xx || STM32F417xx || STM32F412Zx || STM32F412Vx */
+
+#endif /* DATA_IN_ExtSRAM */
+#endif /* STM32F405xx || STM32F415xx || STM32F407xx || STM32F417xx || STM32F427xx || STM32F437xx ||\
+          STM32F429xx || STM32F439xx || STM32F469xx || STM32F479xx || STM32F412Zx || STM32F412Vx  */ 
+  (void)(tmp); 
+}
+#endif /* DATA_IN_ExtSRAM && DATA_IN_ExtSDRAM */
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/ports/stm/tick.c b/ports/stm/tick.c
new file mode 100644
index 000000000..f4adf183a
--- /dev/null
+++ b/ports/stm/tick.c
@@ -0,0 +1,81 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "tick.h"
+
+#include "supervisor/filesystem.h"
+#include "supervisor/shared/tick.h"
+#include "shared-bindings/microcontroller/Processor.h"
+
+#include "stm32f4xx.h"
+
+void SysTick_Handler(void) {
+    // SysTick interrupt handler called when the SysTick timer reaches zero
+    // (every millisecond).
+
+    // Do things common to all ports when the tick occurs
+    supervisor_tick();
+}
+
+uint32_t HAL_GetTick(void) //override ST HAL
+{
+  return (uint32_t)supervisor_ticks_ms32();
+}
+
+void tick_init() {
+    uint32_t ticks_per_ms = SystemCoreClock/ 1000;
+    SysTick_Config(ticks_per_ms); // interrupt is enabled
+
+    NVIC_EnableIRQ(SysTick_IRQn);
+    // Bump up the systick interrupt so nothing else interferes with timekeeping.
+    NVIC_SetPriority(SysTick_IRQn, 0);
+    NVIC_SetPriority(OTG_FS_IRQn, 1);
+}
+
+void tick_delay(uint32_t us) {
+    uint32_t ticks_per_us = SystemCoreClock / 1000 / 1000;
+    uint32_t us_between_ticks = SysTick->VAL / ticks_per_us;
+    uint64_t start_ms = supervisor_ticks_ms64();
+    while (us > 1000) {
+        while (supervisor_ticks_ms64() == start_ms) {}
+        us -= us_between_ticks;
+        start_ms = supervisor_ticks_ms64();
+        us_between_ticks = 1000;
+    }
+    while (SysTick->VAL > ((us_between_ticks - us) * ticks_per_us)) {}
+}
+
+// us counts down!
+void current_tick(uint64_t* ms, uint32_t* us_until_ms) {
+    uint32_t ticks_per_us = SystemCoreClock / 1000 / 1000;
+    *ms = supervisor_ticks_ms32();
+    *us_until_ms = SysTick->VAL / ticks_per_us;
+}
+
+void wait_until(uint64_t ms, uint32_t us_until_ms) {
+    uint32_t ticks_per_us = SystemCoreClock / 1000 / 1000;
+    while(supervisor_ticks_ms64() <= ms && SysTick->VAL / ticks_per_us >= us_until_ms) {}
+}
diff --git a/ports/stm/tick.h b/ports/stm/tick.h
new file mode 100644
index 000000000..999acc7a3
--- /dev/null
+++ b/ports/stm/tick.h
@@ -0,0 +1,44 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef MICROPY_INCLUDED_STM32F4_TICK_H
+#define MICROPY_INCLUDED_STM32F4_TICK_H
+
+#include "py/mpconfig.h"
+
+#include <stdint.h>
+
+extern struct timer_descriptor ms_timer;
+
+void tick_init(void);
+
+void tick_delay(uint32_t us);
+
+void current_tick(uint64_t* ms, uint32_t* us_until_ms);
+// Do not call this with interrupts disabled because it may be waiting for
+// ticks_ms to increment.
+void wait_until(uint64_t ms, uint32_t us_until_ms);
+
+#endif  // MICROPY_INCLUDED_STM32F4_TICK_H