keychron_qmk_firmware/keyboards/handwired/onekey/nucleo_f446re
..
board.h
config.h
halconf.h
keyboard.json
mcuconf.h
readme.md

STM32 Nucleo-L432 onekey

To trigger keypress, short together pins A1 and A2.

You'll also need to connect VIN, GND, USB D+ to PA12/D2, and USB D- to PA11/D10.