libopencm3-examples/examples/stm32/f1/waveshare-open103r/usbserial/README.md

README

This example uses the USB port as a serial port and implements a loopback interface that immediately echos back whatever it receives. After flashing the evaluation board with the usbserial program and connecting it to a host computer with a USB cable, you can run the echo.py command as follows:

$ sudo ./echo.py hello world hello world $