c046b23ea2
Helps prevent the filesystem from getting formatted by mistake, among other things. For example, on a Pico board, entering Ctrl+D and Ctrl+C fast many times will eventually wipe the filesystem (without warning or notice). Further rationale: Ctrl+C is used a lot by automation scripts (eg mpremote) and UI's (eg Mu, Thonny) to get the board into a known state. If the board is not responding for a short time then it's not possible to know if it's just a slow start up (eg in _boot.py), or an infinite loop in the main application. The former should not be interrupted, but the latter should. The only way to distinguish these two cases would be to wait "long enough", and if there's nothing on the serial after "long enough" then assume it's running the application and Ctrl+C should break out of it. But defining "long enough" is impossible for all the different boards and their possible behaviour. The solution in this commit is to make it so that frozen start-up code cannot be interrupted by Ctrl+C. That code then effectively acts like normal C start-up code, which also cannot be interrupted. Note: on the stm32 port this was never seen as an issue because all start-up code is in C. But now other ports start to put more things in _boot.py and so this problem crops up. Signed-off-by: David Grayson <davidegrayson@gmail.com> |
||
|---|---|---|
| .. | ||
| boards | ||
| mcu | ||
| modules | ||
| clock_config.h | ||
| fatfs_port.c | ||
| help.c | ||
| machine_adc.c | ||
| machine_bitstream.c | ||
| machine_dac.c | ||
| machine_i2c.c | ||
| machine_pin.c | ||
| machine_pwm.c | ||
| machine_rtc.c | ||
| machine_spi.c | ||
| machine_uart.c | ||
| machine_wdt.c | ||
| main.c | ||
| Makefile | ||
| modmachine.c | ||
| modmachine.h | ||
| modsamd.c | ||
| moduos.c | ||
| modutime.c | ||
| mpconfigport.h | ||
| mphalport.c | ||
| mphalport.h | ||
| pendsv.c | ||
| pendsv.h | ||
| pin_af.c | ||
| pin_af.h | ||
| qstrdefsport.h | ||
| README.md | ||
| samd_flash.c | ||
| samd_isr.c | ||
| samd_soc.c | ||
| samd_soc.h | ||
| sections.ld | ||
| tusb_config.h | ||
| tusb_port.c | ||
Port of MicroPython to Microchip SAMD MCUs
Supports SAMD21 and SAMD51. For each supported device there is a
subdirectory in the boards/ directory.
The entry point for the specific port documentation is at https://docs.micropython.org/en/latest/samd/quickref.html, which also shows the assignment of IO-Functions to pins. The generic MicroPython documentation applies for anything not specific for the SAM port.
Due to the different flash sizes of SAMD21 and SAMD51 devices, the coverage of MicroPython modules differ. Use help("modules") to tell, which MicroPython modules are provided.
Build instructions
Before building the firmware for a given board the MicroPython cross-compiler must be built; it will be used to pre-compile some of the built-in scripts to bytecode. The cross-compiler is built and run on the host machine, using:
$ make -C mpy-cross
This command should be executed from the root directory of this repository. All other commands below should be executed from the ports/stm32/ directory.
An ARM compiler is required for the build, along with the associated binary
utilities. The default compiler is arm-none-eabi-gcc, which is available for
Arch Linux via the package arm-none-eabi-gcc, for Ubuntu via instructions
here, or
see here for the main GCC ARM
Embedded page. The compiler can be changed using the CROSS_COMPILE variable
when invoking make.
Next, the board to build must be selected. There is no default board. Any
of the names of the subdirectories in the boards/ directory is a valid board.
The board name must be passed as the argument to BOARD= when invoking make.
All boards require certain submodules to be obtained before they can be built.
The correct set of submodules can be initialised using (with
ADAFRUIT_ITSYBITSY_M4_EXPRESS as an example of the selected board):
$ make BOARD=ADAFRUIT_ITSYBITSY_M4_EXPRESS submodules
Then to build the board's firmware run:
$ make BOARD=ADAFRUIT_ITSYBITSY_M4_EXPRESS clean
$ make BOARD=ADAFRUIT_ITSYBITSY_M4_EXPRESS
The above command produces binary images in the
build-ADAFRUIT_ITSYBITSY_M4_EXPRESS/ subdirectory (or the equivalent
directory for the board specified).
Flashing the Firmware
Most SAMD21 and SAMD51 boards have a built in firmware loader. To start it, push
the reset button of the boards twice. The speed varies a little bit. If the
firmware loader starts, a drive will appear in the file manager of your PC.
Copy the created firmware.uf2 file to that drive. If the upload is finished, the
drive will disappear and the board will reboot.