This repository is an example of how to define custom MicroPython boards with custom Python and C modules. The core MicroPython repository is a submodule and other code, including board definitions, is part of this repository.
To set up MicroPython, check out the submodule and build mpy-cross:
$ git submodule update --init lib/micropython
$ make -C lib/micropython/mpy-cross
The various custom boards will require certain submodules of MicroPython itself. These can be initialised via:
$ cd lib/micropython
$ git submodule update --init lib/stm32lib lib/berkeley-db-1.xx
$ cd ../..