This page entry is merely some personal jottings/observations/experiences using STM32F103, mostly as "Bluepill" 64k flash 'F103C8T6. The 'F103 is ST's version of the ...

Additionally, the bootloader now works with "generic" STM32F103 boards that do not have the additional USB reset hardware which all Maple and Maple mini boards have. On "generic" boards, the USB reset ...

The circuit required to tie into the USB lines is made up of just a few basic components, and [Ray] provides a reference schematic and BOM to get you started. The Arduino is programmed to mimic a ...