Merge remote-tracking branch 'adafruit/master' into pybadge_revd

16 files changed, 250 insertions, 11 deletions

diff --git a/.travis.yml b/.travis.yml
index 15addc639..c57f0a534 100755
--- a/.travis.yml
+++ b/.travis.yml
@@ -22,7 +22,7 @@ git:
 # just try to make the builds "about equal in run time"
 env:
   - TRAVIS_TESTS="unix docs translations website" TRAVIS_BOARDS="circuitplayground_express mini_sam_m4 grandcentral_m4_express pca10056 pca10059 feather_nrf52840_express makerdiary_nrf52840_mdk makerdiary_nrf52840_mdk_usb_dongle particle_boron particle_argon particle_xenon sparkfun_nrf52840_mini" TRAVIS_SDK=arm:nrf
-  - TRAVIS_BOARDS="metro_m0_express metro_m4_express metro_m4_airlift_lite pirkey_m0 trellis_m4_express trinket_m0 sparkfun_lumidrive sparkfun_redboard_turbo" TRAVIS_SDK=arm
+  - TRAVIS_BOARDS="metro_m0_express metro_m4_express metro_m4_airlift_lite pirkey_m0 trellis_m4_express trinket_m0 sparkfun_lumidrive sparkfun_redboard_turbo bast_pro_mini_m0" TRAVIS_SDK=arm
   - TRAVIS_BOARDS="feather_radiofruit_zigbee gemma_m0 hallowing_m0_express itsybitsy_m0_express itsybitsy_m4_express meowmeow sam32 uchip" TRAVIS_SDK=arm
   - TRAVIS_BOARDS="feather_m0_express_crickit feather_m0_rfm69 feather_m0_rfm9x feather_m4_express arduino_zero arduino_mkr1300 arduino_mkrzero pewpew10" TRAVIS_SDK=arm
   - TRAVIS_BOARDS="circuitplayground_express_crickit feather_m0_adalogger feather_m0_basic feather_m0_express catwan_usbstick pyportal sparkfun_samd21_mini sparkfun_samd21_dev pybadge" TRAVIS_SDK=arm
diff --git a/main.c b/main.c
index dc47a70de..f7b289776 100755
--- a/main.c
+++ b/main.c
@@ -43,6 +43,7 @@
 #include "lib/mp-readline/readline.h"
 #include "lib/utils/pyexec.h"
 
+#include "background.h"
 #include "mpconfigboard.h"
 #include "shared-module/displayio/__init__.h"
 #include "supervisor/cpu.h"
@@ -89,6 +90,8 @@ void start_mp(supervisor_allocation* heap) {
     reset_status_led();
     autoreload_stop();
 
+    background_tasks_reset();
+
     // Stack limit should be less than real stack size, so we have a chance
     // to recover from limit hit.  (Limit is measured in bytes.)
     mp_stack_ctrl_init();
diff --git a/ports/atmel-samd/background.c b/ports/atmel-samd/background.c
index a8c4e3891..4e88d34e7 100644
--- a/ports/atmel-samd/background.c
+++ b/ports/atmel-samd/background.c
@@ -42,8 +42,20 @@ volatile uint64_t last_finished_tick = 0;
 
 bool stack_ok_so_far = true;
 
+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;
+    }
     assert_heap_ok();
+    running_background_tasks = true;
+
     #if (defined(SAMD21) && defined(PIN_PA02)) || defined(SAMD51)
     audio_dma_background();
     #endif
@@ -56,6 +68,7 @@ void run_background_tasks(void) {
     #endif
     filesystem_background();
     usb_background();
+    running_background_tasks = false;
     assert_heap_ok();
 
     last_finished_tick = ticks_ms;
diff --git a/ports/atmel-samd/background.h b/ports/atmel-samd/background.h
index 8d1316e73..d9866a6ab 100644
--- a/ports/atmel-samd/background.h
+++ b/ports/atmel-samd/background.h
@@ -29,6 +29,7 @@
 
 #include <stdbool.h>
 
+void background_tasks_reset(void);
 void run_background_tasks(void);
 void run_background_vm_tasks(void);
 bool background_tasks_ok(void);
diff --git a/ports/atmel-samd/boards/bast_pro_mini_m0/board.c b/ports/atmel-samd/boards/bast_pro_mini_m0/board.c
new file mode 100644
index 000000000..c8e20206a
--- /dev/null
+++ b/ports/atmel-samd/boards/bast_pro_mini_m0/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/atmel-samd/boards/bast_pro_mini_m0/mpconfigboard.h b/ports/atmel-samd/boards/bast_pro_mini_m0/mpconfigboard.h
new file mode 100644
index 000000000..561240c69
--- /dev/null
+++ b/ports/atmel-samd/boards/bast_pro_mini_m0/mpconfigboard.h
@@ -0,0 +1,53 @@
+#define MICROPY_HW_BOARD_NAME "Electronic Cats Bast Pro Mini M0"
+#define MICROPY_HW_MCU_NAME "samd21e18"
+
+#define MICROPY_PORT_A        (0)
+#define MICROPY_PORT_B        (0)
+#define MICROPY_PORT_C        (0)
+
+#define CIRCUITPY_INTERNAL_NVM_SIZE 0
+
+#define DEFAULT_I2C_BUS_SCL (&pin_PA08)
+#define DEFAULT_I2C_BUS_SDA (&pin_PA09)
+
+#define DEFAULT_SPI_BUS_SCK (&pin_PA17)
+#define DEFAULT_SPI_BUS_MOSI (&pin_PA16)
+#define DEFAULT_SPI_BUS_MISO (&pin_PA19)
+
+#define DEFAULT_UART_BUS_RX (&pin_PA01)
+#define DEFAULT_UART_BUS_TX (&pin_PA00)
+
+#define BOARD_FLASH_SIZE (0x00040000 - 0x2000 - 0x010000)
+
+#define IGNORE_PIN_PA03     1
+#define IGNORE_PIN_PA12     1
+#define IGNORE_PIN_PA13     1
+#define IGNORE_PIN_PA20     1
+#define IGNORE_PIN_PA21     1
+// USB is always used.
+#define IGNORE_PIN_PA24     1
+#define IGNORE_PIN_PA25     1
+#define IGNORE_PIN_PA30     1
+#define IGNORE_PIN_PA31     1
+#define IGNORE_PIN_PB01     1
+#define IGNORE_PIN_PB02     1
+#define IGNORE_PIN_PB03     1
+#define IGNORE_PIN_PB04     1
+#define IGNORE_PIN_PB05     1
+#define IGNORE_PIN_PB06     1
+#define IGNORE_PIN_PB07     1
+#define IGNORE_PIN_PB08     1
+#define IGNORE_PIN_PB09     1
+#define IGNORE_PIN_PB10     1
+#define IGNORE_PIN_PB11     1
+#define IGNORE_PIN_PB12     1
+#define IGNORE_PIN_PB13     1
+#define IGNORE_PIN_PB14     1
+#define IGNORE_PIN_PB15     1
+#define IGNORE_PIN_PB16     1
+#define IGNORE_PIN_PB17     1
+#define IGNORE_PIN_PB22     1
+#define IGNORE_PIN_PB23     1
+#define IGNORE_PIN_PB30     1
+#define IGNORE_PIN_PB31     1
+#define IGNORE_PIN_PB00     1
diff --git a/ports/atmel-samd/boards/bast_pro_mini_m0/mpconfigboard.mk b/ports/atmel-samd/boards/bast_pro_mini_m0/mpconfigboard.mk
new file mode 100644
index 000000000..38a6afd17
--- /dev/null
+++ b/ports/atmel-samd/boards/bast_pro_mini_m0/mpconfigboard.mk
@@ -0,0 +1,12 @@
+LD_FILE = boards/samd21x18-bootloader.ld
+USB_VID = 0xBAB3
+USB_PID = 0x1209
+USB_PRODUCT = "Bast Pro Mini M0"
+USB_MANUFACTURER = "Electronic Cats"
+
+INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL = NONE
+CIRCUITPY_SMALL_BUILD = 1
+
+CHIP_VARIANT = SAMD21E18A
+CHIP_FAMILY = samd21
diff --git a/ports/atmel-samd/boards/bast_pro_mini_m0/pins.c b/ports/atmel-samd/boards/bast_pro_mini_m0/pins.c
new file mode 100644
index 000000000..3ed940e36
--- /dev/null
+++ b/ports/atmel-samd/boards/bast_pro_mini_m0/pins.c
@@ -0,0 +1,36 @@
+#include "shared-bindings/board/__init__.h"
+
+STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA02) },
+    { MP_ROM_QSTR(MP_QSTR_A1), MP_ROM_PTR(&pin_PA04) },
+    { MP_ROM_QSTR(MP_QSTR_A2), MP_ROM_PTR(&pin_PA05) },
+    { MP_ROM_QSTR(MP_QSTR_A3), MP_ROM_PTR(&pin_PA10) },
+    { MP_ROM_QSTR(MP_QSTR_A4), MP_ROM_PTR(&pin_PA08) },
+    { MP_ROM_QSTR(MP_QSTR_A5), MP_ROM_PTR(&pin_PA09) },
+    { MP_ROM_QSTR(MP_QSTR_D0), MP_ROM_PTR(&pin_PA00) },
+    { MP_ROM_QSTR(MP_QSTR_RX), MP_ROM_PTR(&pin_PA01) },
+    { MP_ROM_QSTR(MP_QSTR_D1), MP_ROM_PTR(&pin_PA01) },
+    { MP_ROM_QSTR(MP_QSTR_TX), MP_ROM_PTR(&pin_PA00) },
+    { MP_ROM_QSTR(MP_QSTR_D2), MP_ROM_PTR(&pin_PA14) },
+    { MP_ROM_QSTR(MP_QSTR_D3), MP_ROM_PTR(&pin_PA23) },
+    { MP_ROM_QSTR(MP_QSTR_D4), MP_ROM_PTR(&pin_PA22) },
+    { MP_ROM_QSTR(MP_QSTR_D5), MP_ROM_PTR(&pin_PA15) },
+    { MP_ROM_QSTR(MP_QSTR_D6), MP_ROM_PTR(&pin_PA27) },
+    { MP_ROM_QSTR(MP_QSTR_D7), MP_ROM_PTR(&pin_PA28) },
+    { MP_ROM_QSTR(MP_QSTR_D8), MP_ROM_PTR(&pin_PA06) },
+    { MP_ROM_QSTR(MP_QSTR_D9), MP_ROM_PTR(&pin_PA07) },
+    { MP_ROM_QSTR(MP_QSTR_D10), MP_ROM_PTR(&pin_PA18) },
+    { MP_ROM_QSTR(MP_QSTR_D11), MP_ROM_PTR(&pin_PA16) },
+    { MP_ROM_QSTR(MP_QSTR_D12), MP_ROM_PTR(&pin_PA19) },
+    { MP_ROM_QSTR(MP_QSTR_D13), MP_ROM_PTR(&pin_PA17) },
+    { MP_ROM_QSTR(MP_QSTR_LED), MP_ROM_PTR(&pin_PA11) },
+    { MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_PA08) },
+    { MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_PA09) },
+    { MP_ROM_QSTR(MP_QSTR_SCK), MP_ROM_PTR(&pin_PA17) },
+    { MP_ROM_QSTR(MP_QSTR_MOSI), MP_ROM_PTR(&pin_PA16) },
+    { MP_ROM_QSTR(MP_QSTR_MISO), MP_ROM_PTR(&pin_PA19) },
+    { 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_global_dict_table);
diff --git a/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.h b/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.h
index 530e7e4c3..79d0cd269 100644
--- a/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.h
+++ b/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.h
@@ -36,3 +36,7 @@
 // USB is always used internally so skip the pin objects for it.
 #define IGNORE_PIN_PA24     1
 #define IGNORE_PIN_PA25     1
+
+// Not connected
+#define IGNORE_PIN_PA13     1
+#define IGNORE_PIN_PA28     1
diff --git a/ports/atmel-samd/boards/pybadge/pins.c b/ports/atmel-samd/boards/pybadge/pins.c
index 2134cf8c7..2e7e6d496 100644
--- a/ports/atmel-samd/boards/pybadge/pins.c
+++ b/ports/atmel-samd/boards/pybadge/pins.c
@@ -4,30 +4,59 @@
 #include "shared-module/displayio/__init__.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
+    { MP_OBJ_NEW_QSTR(MP_QSTR_A0),  MP_ROM_PTR(&pin_PA02) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_A1),  MP_ROM_PTR(&pin_PA05) },
     { MP_OBJ_NEW_QSTR(MP_QSTR_A2),  MP_ROM_PTR(&pin_PB08) },
     { MP_OBJ_NEW_QSTR(MP_QSTR_A3),  MP_ROM_PTR(&pin_PB09) },
     { MP_OBJ_NEW_QSTR(MP_QSTR_A4),  MP_ROM_PTR(&pin_PA04) },
     { MP_OBJ_NEW_QSTR(MP_QSTR_A5),  MP_ROM_PTR(&pin_PA06) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_A6),  MP_ROM_PTR(&pin_PB01) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_A7),  MP_ROM_PTR(&pin_PB04) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_A8),  MP_ROM_PTR(&pin_PB03) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_A9),  MP_ROM_PTR(&pin_PB02) },
 
+    { MP_OBJ_NEW_QSTR(MP_QSTR_D0),  MP_ROM_PTR(&pin_PB17) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_D1),  MP_ROM_PTR(&pin_PB16) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_D2),  MP_ROM_PTR(&pin_PB03) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_D3),  MP_ROM_PTR(&pin_PB02) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_D4),  MP_ROM_PTR(&pin_PA14) },
     { MP_OBJ_NEW_QSTR(MP_QSTR_D5),  MP_ROM_PTR(&pin_PA16) },
     { MP_OBJ_NEW_QSTR(MP_QSTR_D6),  MP_ROM_PTR(&pin_PA18) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_D7),  MP_ROM_PTR(&pin_PB14) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_D8),  MP_ROM_PTR(&pin_PA15) },
     { MP_OBJ_NEW_QSTR(MP_QSTR_D9),  MP_ROM_PTR(&pin_PA19) },
     { MP_OBJ_NEW_QSTR(MP_QSTR_D10),  MP_ROM_PTR(&pin_PA20) },
     { MP_OBJ_NEW_QSTR(MP_QSTR_D11),  MP_ROM_PTR(&pin_PA21) },
     { MP_OBJ_NEW_QSTR(MP_QSTR_D12),  MP_ROM_PTR(&pin_PA22) },
     { MP_OBJ_NEW_QSTR(MP_QSTR_D13),  MP_ROM_PTR(&pin_PA23) },
 
-    { MP_OBJ_NEW_QSTR(MP_QSTR_NEOPIXEL),  MP_ROM_PTR(&pin_PA15) },
+    // UART
+    { MP_OBJ_NEW_QSTR(MP_QSTR_RX),  MP_ROM_PTR(&pin_PB17) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_TX),  MP_ROM_PTR(&pin_PB16) },
 
-    { MP_OBJ_NEW_QSTR(MP_QSTR_AVCC),  MP_ROM_PTR(&pin_PA03) },
-    { MP_OBJ_NEW_QSTR(MP_QSTR_LEFT_DAC),  MP_ROM_PTR(&pin_PA02) },
-    { MP_OBJ_NEW_QSTR(MP_QSTR_RIGHT_DAC),  MP_ROM_PTR(&pin_PA05) },
+    // I2C
+    { MP_OBJ_NEW_QSTR(MP_QSTR_SDA),  MP_ROM_PTR(&pin_PA12) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_SCL),  MP_ROM_PTR(&pin_PA13) },
 
+    // SPI
     { MP_OBJ_NEW_QSTR(MP_QSTR_SCK),  MP_ROM_PTR(&pin_PA17) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_MISO),  MP_ROM_PTR(&pin_PB22) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_MOSI),  MP_ROM_PTR(&pin_PB23) },
+
+    // Special named pins
+    { MP_OBJ_NEW_QSTR(MP_QSTR_NEOPIXEL),  MP_ROM_PTR(&pin_PA15) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_LIGHT),  MP_ROM_PTR(&pin_PB04) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_ACCELEROMETER_INTERRUPT),  MP_ROM_PTR(&pin_PB14) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_SPEAKER),  MP_ROM_PTR(&pin_PA02) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_SPEAKER_ENABLE),  MP_ROM_PTR(&pin_PA27) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_BUTTON_LATCH),  MP_ROM_PTR(&pin_PB00) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_BUTTON_OUT),  MP_ROM_PTR(&pin_PB30) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_BUTTON_CLOCK),  MP_ROM_PTR(&pin_PB31) },
 
+    // TFT control pins
     { MP_OBJ_NEW_QSTR(MP_QSTR_TFT_LITE),  MP_ROM_PTR(&pin_PA00) },
-    { MP_OBJ_NEW_QSTR(MP_QSTR_TFT_MOSI),  MP_ROM_PTR(&pin_PA12) },
-    { MP_OBJ_NEW_QSTR(MP_QSTR_TFT_SCK),  MP_ROM_PTR(&pin_PA13) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_TFT_MOSI),  MP_ROM_PTR(&pin_PB15) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_TFT_SCK),  MP_ROM_PTR(&pin_PB13) },
     { MP_OBJ_NEW_QSTR(MP_QSTR_TFT_RST),  MP_ROM_PTR(&pin_PA01) },
     { MP_ROM_QSTR(MP_QSTR_TFT_CS), MP_ROM_PTR(&pin_PB07) },
     { MP_ROM_QSTR(MP_QSTR_TFT_DC), MP_ROM_PTR(&pin_PB05) },
diff --git a/ports/atmel-samd/boards/sparkfun_lumidrive/mpconfigboard.mk b/ports/atmel-samd/boards/sparkfun_lumidrive/mpconfigboard.mk
index a24d08ac9..eaaffa544 100755
--- a/ports/atmel-samd/boards/sparkfun_lumidrive/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/sparkfun_lumidrive/mpconfigboard.mk
@@ -11,7 +11,7 @@ CHIP_VARIANT = SAMD21G18A
 CHIP_FAMILY = samd21
 
 # Make room for frozen libraries.
-CFLAGS_INLINE_LIMIT = 65
+CFLAGS_INLINE_LIMIT = 55
 
 EXTERNAL_FLASH_DEVICE_COUNT = 1
 EXTERNAL_FLASH_DEVICES = "W25Q32FV"
diff --git a/ports/nrf/background.c b/ports/nrf/background.c
index ea6e846b3..3fb5febd3 100644
--- a/ports/nrf/background.c
+++ b/ports/nrf/background.c
@@ -33,13 +33,25 @@
 #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();
     usb_background();
 
     #ifdef CIRCUITPY_DISPLAYIO
     displayio_refresh_displays();
     #endif
+    running_background_tasks = false;
 
     assert_heap_ok();
 }
diff --git a/ports/nrf/background.h b/ports/nrf/background.h
new file mode 100644
index 000000000..d53681c0f
--- /dev/null
+++ b/ports/nrf/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_NRF_BACKGROUND_H
+#define MICROPY_INCLUDED_NRF_BACKGROUND_H
+
+#include <stdbool.h>
+
+void background_tasks_reset(void);
+void run_background_tasks(void);
+
+#endif  // MICROPY_INCLUDED_NRF_BACKGROUND_H
diff --git a/ports/nrf/supervisor/qspi_flash.c b/ports/nrf/supervisor/qspi_flash.c
index 51a9ec032..bb449d881 100644
--- a/ports/nrf/supervisor/qspi_flash.c
+++ b/ports/nrf/supervisor/qspi_flash.c
@@ -47,8 +47,7 @@ bool spi_flash_command(uint8_t command) {
         .wipwait = false,
         .wren = false
     };
-    nrfx_qspi_cinstr_xfer(&cinstr_cfg, NULL, NULL);
-    return true;
+    return nrfx_qspi_cinstr_xfer(&cinstr_cfg, NULL, NULL) == NRFX_SUCCESS;
 }
 
 bool spi_flash_read_command(uint8_t command, uint8_t* response, uint32_t length) {
diff --git a/py/gc.c b/py/gc.c
index 246df1503..e0439e945 100755
--- a/py/gc.c
+++ b/py/gc.c
@@ -945,6 +945,10 @@ void *gc_realloc(void *ptr_in, size_t n_bytes, bool allow_move) {
 #endif // Alternative gc_realloc impl
 
 bool gc_never_free(void *ptr) {
+    // Check to make sure the pointer is on the heap in the first place.
+    if (gc_nbytes(ptr) == 0) {
+        return false;
+    }
     // Pointers are stored in a linked list where each block is BYTES_PER_BLOCK long and the first
     // pointer is the next block of pointers.
     void ** current_reference_block = MP_STATE_MEM(permanent_pointers);
diff --git a/shared-bindings/busio/UART.c b/shared-bindings/busio/UART.c
index b40f3fa03..94ad1bd3e 100644
--- a/shared-bindings/busio/UART.c
+++ b/shared-bindings/busio/UART.c
@@ -57,7 +57,7 @@
 //|   :param int bits:  the number of bits per byte, 7, 8 or 9.
 //|   :param Parity parity:  the parity used for error checking.
 //|   :param int stop:  the number of stop bits, 1 or 2.
-//|   :param int timeout:  the timeout in seconds to wait for the first character and between subsequent characters. Raises ``ValueError`` if timeout >100 seconds.
+//|   :param float timeout:  the timeout in seconds to wait for the first character and between subsequent characters. Raises ``ValueError`` if timeout >100 seconds.
 //|   :param int receiver_buffer_size: the character length of the read buffer (0 to disable). (When a character is 9 bits the buffer will be 2 * receiver_buffer_size bytes.)
 //|
 //|   *New in CircuitPython 4.0:* ``timeout`` has incompatibly changed units from milliseconds to seconds.