I designed a board that uses a STM32H750 with a USB3300-EZK that has stopped communicating over USB. It's been having intermittent issues for the last day or so (sometimes I'd need to power cycle the board before it would show up, but then it would work flawlessly). Earlier today, I plugged it into a Raspberry Pi, and then it died fully. I've plugged it into that Pi before without issue.
Despite probably hundreds of cycles at this point, I haven't gotten the USB to work again. The PHY is generating a stable 60MHz clock, and DIR is low. I haven't observed any communication on the D0..8 lines. That leads me to believe the problem is with the STM32.
I am using pc2_c and pc3_c, which are supposed to work with USB, although I've heard they're more susceptible to (static?) damage.
I do have a second board that I can switch to, although I don't have a third prototype, and it really would be good to figure out what happened here so I can prevent it from happening again.
