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Debugging Bootloader Code Sequence

Question asked by bujak.daniel on May 16, 2018
Latest reply on May 16, 2018 by Clive One

I'm unable to get my STM32F411 into USB DFU mode on custom hardware. Based on the flow in AN2606 a number of things could be causing this. I've seen a number of references on here with people having issues getting HSE recognized (I have a 4MHz HSE which should be within spec) but I'm not sure how to debug the flow to see where we're getting stuck or what state it's ending up in. Is there a way to do this?