keychron_qmk_firmware/keyboards/handwired/onekey/bluepill_uf2boot
..
config.h
halconf.h
keyboard.json
mcuconf.h
readme.md

Bluepill onekey

To trigger keypress, short together pins B0 and A7.

This variant requires the uf2-stm32f103 bootloader to be installed. This can be downloaded from the uf2-stm32f103 releases page.

Double-tap reset to enter bootloader mode. Copy the built uf2 file to the device by dragging the file to the new USB disk.