A while back, an article was posted about the lack of USB on STM32F103 µCs, when it comes to Mecrisp Forth, that is. Unfortunately, getting the built-in USB device-mode hardware working is quite a challenging task. Not only is the USB protocol fairly complex - the actual USB interface hardware on that particular model STM µC is in fact ridiculously messy!
It has all the appearances of a rushed-to-market design, just to get that USB feature shipping!
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