usbtest/README.md

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## 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 -G Ninja`
### Build libopencm3
cmake --build build --verbose -t libopencm3
### Build project elf
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