Assumes libopencm3 (https://github.com/libopencm3/libopencm3) is installed (git clone https://github.com/libopencm3/libopencm3 && cd libopencm3 && make): make sure to adapt -L and -I options to your directory structure so that libraries and header files are found at compile time.

For STM32F1(00)-VL-Discovery board,

ln -s Makefile.stm32f1 Makefile
make

For STM32F4 based boards,

ln -s Makefile.stm32f4 Makefile
make

For STM32F1(03) based boards,

ln -s Makefile.stm32f1 Makefile
make

For running on qemu, install Andre Beckus version of qemu for STM32 as found at https://github.com/beckus/qemu_stm32 and

make -f Makefile.stm32f1 qemu

The software architecture is organized to provide functions with the same prototype (input and output arguments) for various microcontroller architectures and select upon linking which version is used with portable, common main functions. Start with main_uart.c as a basic example, and link the appropriate Makefile.* to Makefile (ln -s) to compile for the given target using make.