[duskwuff]

Can you point to where the undocumented registers are used in the source? I don't see anything obvious that fits that definition in:

https://github.com/STMicroelectronics/STM32CubeF4/tree/maste...

(I've chosen the version for STM32F4 arbitrarily; if there's something similar in one of their other USB support libraries, feel free to point to that instead.)

[dmitrygr]

a few bits used here are not in the docs: https://github.com/STMicroelectronics/STM32CubeF4/blob/maste...

[duskwuff]

That's a 2000-line file. What part of it are you referring to?