Build

First time:

0. git submodule update --init
1. make -C libopencm3
2. cmake -S . --preset=default

or older cmake:

2. cmake -S . -B build -DCMAKE_TOOLCHAIN_FILE=toolchain-STM32F1.cmake

And then to build an .elf

0. cmake --build build --verbose

RTT debug console

run this while openocd is running

while true; do if nc -z localhost 9090; then telnet localhost 9090; else sleep 1; fi; done