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circuitpython/ports/minimal
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Daniel Jour 9c6fd974f7 minimal/Makefile: Avoid terminal reset, use BUILD variable. 
stty can provide the current terminal settings, so that they can be
stored in a shell variable and restored after running the firmware. This
avoids the complete "blanking" of the terminal, and thus also removes the
need for the sleep call.

The run target now references the firmware file using the BUILD variable
instead of using the hard coded "build/" path.
 		2022-08-11 14:07:18 +10:00
..
Makefile minimal/Makefile: Avoid terminal reset, use BUILD variable. 2022-08-11 14:07:18 +10:00
README.md minimal/README: Update text to better describe what "make run" does. 2018-01-31 21:05:21 +11:00
frozentest.mpy ports: Recompile bytecode tests now that .mpy format changed. 2022-04-14 23:52:14 +10:00
frozentest.py all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
main.c ports: Use default VFS config for import_stat and builtin_open. 2022-05-25 13:04:45 +10:00
mpconfigport.h shared/readline: Use MP_REGISTER_ROOT_POINTER(). 2022-07-18 13:48:49 +10:00
mphalport.h all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
qstrdefsport.h all: Add *FORMAT-OFF* in various places. 2020-02-28 10:31:07 +11:00
stm32f405.ld ports: Make new ports/ sub-directory and move all ports there. 2017-09-06 13:40:51 +10:00
uart_core.c unix,windows: Use STDIN_FILENO, STDOUT_FILENO macros where appropriate. 2020-03-25 00:59:05 +11:00

README.md

The minimal port

This port is intended to be a minimal MicroPython port that actually runs. It can run under Linux (or similar) and on any STM32F4xx MCU (eg the pyboard).

Building and running Linux version

By default the port will be built for the host machine:

$ make

To run the executable and get a basic working REPL do:

$ make run

Building for an STM32 MCU

The Makefile has the ability to build for a Cortex-M CPU, and by default includes some start-up code for an STM32F4xx MCU and also enables a UART for communication. To build:

$ make CROSS=1

If you previously built the Linux version, you will need to first run make clean to get rid of incompatible object files.

Building will produce the build/firmware.dfu file which can be programmed to an MCU using:

$ make CROSS=1 deploy

This version of the build will work out-of-the-box on a pyboard (and anything similar), and will give you a MicroPython REPL on UART1 at 9600 baud. Pin PA13 will also be driven high, and this turns on the red LED on the pyboard.

Building without the built-in MicroPython compiler

This minimal port can be built with the built-in MicroPython compiler disabled. This will reduce the firmware by about 20k on a Thumb2 machine, and by about 40k on 32-bit x86. Without the compiler the REPL will be disabled, but pre-compiled scripts can still be executed.

To test out this feature, change the MICROPY_ENABLE_COMPILER config option to "0" in the mpconfigport.h file in this directory. Then recompile and run the firmware and it will execute the frozentest.py file.