STM32 Bare Metal USB Implementation
Implementing your own bare metal USB stack may provide certain benefits like little to no dependencies, smaller code size, better understanding of internals and suffering. This article documents the process I went through to manually set up and get the USB core of an STM32F401CCU6 to do what I wanted. My goal was to successfully return a device descriptor. Once I got that working I had a greater appreciation for TinyUSB and went with it, however this was still a painful great learning experience....