Arduino for STM32

Some years ago I did a board compatible with both the Blue Pill and the Maple Mini using a single sided homebrew PCB just to start to play with STM32F103C8T6 and programming it with the USB bootloader (Roger's core) or the ST-LINK v2 Hi! I have the feeling that this is about what I need. Your examp...

Op is already in that "place" ... just wanting to evolve to a homebrew board design... Yes, correct. My point is that I'm basically trying to use the code I've already written, which is quite big already, directly into a new standalone MCU chip in a custom board (I didn't know there was a...

Hi there everyone, Sorry if this has already been addressed, I just can't find anything about it and I've been searching for ages. I'm used to projects using stand-alone Atmega chips and Arduino Bootloader, there are plenty of tutorials online and it's simple to do. I've done several PCBs with just ...