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STM32F407ZG USB DFU Device Descriptor Request Failed

LLawr.1
Associate II

‎2022-04-22 04:09 PM

I want to use the factory USB DFU bootloader for production programming. I have set BOOT0 to 1 and BOOT1 to 0, powered on the board, and plugged in the USB, and in device manager I get an unknown device (device descriptor request failed). I am not sure what I am doing wrong.

Schematics are as follows:

0693W00000LynsGQAR.pngIs there anything I am missing? I'm sure I followed AN4879 well enough for it to work...

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LLawr.1
Associate II

‎2022-04-25 09:22 AM

Ah, it would appear I overlooked the fact that I have a CAN transciever on PA11 & PA12. Removing that makes it work, but it takes quite a long time for the STM32 BOOTLOADER to appear in device manager. Any reason why that is?

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