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:
To run a small test script 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.