## 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
