Add non-volatile memory support to STM

8 files changed, 286 insertions, 6 deletions

diff --git a/ports/stm/boards/STM32F411VETx_nvm_FLASH.ld b/ports/stm/boards/STM32F411VETx_nvm_FLASH.ld
new file mode 100644
index 000000000..8382cb781
--- /dev/null
+++ b/ports/stm/boards/STM32F411VETx_nvm_FLASH.ld
@@ -0,0 +1,118 @@
+/*
+    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 = 32K /* sectors 1,2 are 16K */
+    FLASH_NVM (rwx) : ORIGIN = 0x0800C000, LENGTH = 16K /* sector 3 is 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 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);
+_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
+
+    /* Non-volitile memory */
+    .nvm_data :
+    {
+        . = ALIGN(4);
+        KEEP(*(.nvm_data))
+        . = ALIGN(4);
+    } >FLASH_NVM
+
+    /* 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/thunderpack/mpconfigboard.h b/ports/stm/boards/thunderpack/mpconfigboard.h
index 0e66f2a71..62bf7609d 100644
--- a/ports/stm/boards/thunderpack/mpconfigboard.h
+++ b/ports/stm/boards/thunderpack/mpconfigboard.h
@@ -26,17 +26,18 @@
 #define MICROPY_HW_BOARD_NAME       "THUNDERPACK"
 #define MICROPY_HW_MCU_NAME         "STM32F411CE"
 
-#define FLASH_SIZE                  (0x80000)
-#define FLASH_PAGE_SIZE             (0x4000)
-#define BOARD_FLASH_SIZE            (FLASH_SIZE - 0x2000 - 0xC000)
+#define FLASH_SIZE                         (0x80000)
+#define FLASH_PAGE_SIZE                    (0x4000)
+#define CIRCUITPY_INTERNAL_NVM_SIZE        (0x4000)
+#define CIRCUITPY_INTERNAL_NVM_START_ADDR  (0x0800C000)
+#define CIRCUITPY_INTERNAL_NVM_SECTOR      FLASH_SECTOR_3
+#define BOARD_FLASH_SIZE            (FLASH_SIZE - CIRCUITPY_INTERNAL_NVM_SIZE- 0x2000 - 0xC000)
 
 #define BOARD_OSC_DIV               (24)
 #define BOARD_OVERWRITE_SWD         (1)
 #define BOARD_NO_VBUS_SENSE         (1)
 
 // Status LEDs
-#define MICROPY_HW_LED_TX      (&pin_PA00)
-#define MICROPY_HW_LED_RX      (&pin_PB01)
 #define MICROPY_HW_LED_STATUS  (&pin_PA02)
 
 #define DEFAULT_I2C_BUS_SCL (&pin_PB06)
diff --git a/ports/stm/boards/thunderpack/mpconfigboard.mk b/ports/stm/boards/thunderpack/mpconfigboard.mk
index 0bf5b57a8..6fcaae6ab 100644
--- a/ports/stm/boards/thunderpack/mpconfigboard.mk
+++ b/ports/stm/boards/thunderpack/mpconfigboard.mk
@@ -7,12 +7,14 @@ USB_DEVICES = "CDC,MSC"
 INTERNAL_FLASH_FILESYSTEM = 1
 LONGINT_IMPL = NONE
 
+CIRCUITPY_NVM = 1
+
 MCU_SERIES = m4
 MCU_VARIANT = stm32f4
 MCU_SUB_VARIANT = stm32f411xe
 MCU_PACKAGE = 48
 CMSIS_MCU = STM32F411xE
-LD_FILE = boards/STM32F411VETx_FLASH.ld
+LD_FILE = boards/STM32F411VETx_nvm_FLASH.ld
 STARTUP_FILE = startup_stm32f411xe.s
 
 
diff --git a/ports/stm/common-hal/microcontroller/__init__.c b/ports/stm/common-hal/microcontroller/__init__.c
index 0c680eb05..85e66fb00 100644
--- a/ports/stm/common-hal/microcontroller/__init__.c
+++ b/ports/stm/common-hal/microcontroller/__init__.c
@@ -32,6 +32,7 @@
 #include "common-hal/microcontroller/Pin.h"
 #include "common-hal/microcontroller/Processor.h"
 
+#include "shared-bindings/nvm/ByteArray.h"
 #include "shared-bindings/microcontroller/__init__.h"
 #include "shared-bindings/microcontroller/Pin.h"
 #include "shared-bindings/microcontroller/Processor.h"
@@ -109,6 +110,17 @@ const mcu_processor_obj_t common_hal_mcu_processor_obj = {
     },
 };
 
+#if CIRCUITPY_INTERNAL_NVM_SIZE > 0
+// The singleton nvm.ByteArray object.
+const nvm_bytearray_obj_t common_hal_mcu_nvm_obj = {
+    .base = {
+        .type = &nvm_bytearray_type,
+    },
+    .len = NVM_BYTEARRAY_BUFFER,
+    .start_address = (uint8_t*) (CIRCUITPY_INTERNAL_NVM_START_ADDR)
+};
+#endif
+
 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) },
diff --git a/ports/stm/common-hal/nvm/ByteArray.c b/ports/stm/common-hal/nvm/ByteArray.c
new file mode 100644
index 000000000..1aaf54653
--- /dev/null
+++ b/ports/stm/common-hal/nvm/ByteArray.c
@@ -0,0 +1,73 @@
+/*
+ * 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 "common-hal/nvm/ByteArray.h"
+
+#include "stm32f4xx_hal.h"
+
+#include "supervisor/shared/stack.h"
+
+#include <stdint.h>
+#include <string.h>
+
+uint32_t common_hal_nvm_bytearray_get_length(nvm_bytearray_obj_t *self) {
+    return self->len;
+}
+
+bool common_hal_nvm_bytearray_set_bytes(nvm_bytearray_obj_t *self,
+        uint32_t start_index, uint8_t* values, uint32_t len) {
+    // Copy flash to buffer
+    uint8_t buffer[self->len];
+    memcpy(buffer, self->start_address, self->len);
+
+    // Set bytes in buffer
+    memmove(buffer + start_index, values, len);
+
+    // Erase flash sector
+    HAL_FLASH_Unlock();
+    __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR | FLASH_FLAG_PGAERR | FLASH_FLAG_PGSERR );
+    FLASH_Erase_Sector(CIRCUITPY_INTERNAL_NVM_SECTOR, VOLTAGE_RANGE_3);
+
+    // Write bytes to flash
+    uint32_t i;
+    uint32_t flash_addr = (uint32_t)self->start_address;
+    for (i = 0; i < self->len; i++, flash_addr++) {
+        if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_BYTE, flash_addr, buffer[i]) != HAL_OK) {
+            HAL_FLASH_Lock();
+            return false;
+        }
+    }
+    
+    // Finish up
+    HAL_FLASH_Lock();
+    return true;
+}
+
+// NVM memory is memory mapped so reading it is easy.
+void common_hal_nvm_bytearray_get_bytes(nvm_bytearray_obj_t *self,
+    uint32_t start_index, uint32_t len, uint8_t* values) {
+    memcpy(values, self->start_address + start_index, len);
+}
diff --git a/ports/stm/common-hal/nvm/ByteArray.h b/ports/stm/common-hal/nvm/ByteArray.h
new file mode 100644
index 000000000..8ad64cb81
--- /dev/null
+++ b/ports/stm/common-hal/nvm/ByteArray.h
@@ -0,0 +1,43 @@
+/*
+ * 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_STM32_COMMON_HAL_NVM_BYTEARRAY_H
+#define MICROPY_INCLUDED_STM32_COMMON_HAL_NVM_BYTEARRAY_H
+
+#include "py/obj.h"
+
+// STM flash is saved in sectors (not pages), at a minimum size of 16k.
+// To limit the RAM usage during writing, we want to set a smaller
+// maximum value.
+#define NVM_BYTEARRAY_BUFFER 512
+
+typedef struct {
+    mp_obj_base_t base;
+    uint8_t* start_address;
+    uint32_t len;
+} nvm_bytearray_obj_t;
+
+#endif // MICROPY_INCLUDED_STM32_COMMON_HAL_NVM_BYTEARRAY_H
diff --git a/ports/stm/common-hal/nvm/__init__.c b/ports/stm/common-hal/nvm/__init__.c
new file mode 100644
index 000000000..f0792430f
--- /dev/null
+++ b/ports/stm/common-hal/nvm/__init__.c
@@ -0,0 +1,27 @@
+/*
+ * 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.
+ */
+
+// No nvm module functions.
diff --git a/ports/stm/supervisor/internal_flash.h b/ports/stm/supervisor/internal_flash.h
index 9f16a799d..859470ff0 100644
--- a/ports/stm/supervisor/internal_flash.h
+++ b/ports/stm/supervisor/internal_flash.h
@@ -39,8 +39,12 @@
 
 #ifdef STM32F411xE
 #define STM32_FLASH_SIZE 0x80000 //512KiB
+#ifdef CIRCUITPY_NVM
+#define INTERNAL_FLASH_FILESYSTEM_SIZE 0x8000 //32KiB
+#else
 #define INTERNAL_FLASH_FILESYSTEM_SIZE 0xC000 //48KiB
 #endif
+#endif
 
 #ifdef STM32F412Zx
 #define STM32_FLASH_SIZE 0x100000 //1MB