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STM32F405RG USB FS (device mode) not working

Question asked by Io D on Mar 23, 2018

Dear all,

I am having some issues making the USB FS to work using the STM32F405 microcontroller.

The setup is pretty simple by following the guidelines found in this forum, however it still not working. My custom board has an external crystal of 25Mhz and I connected directly the pins of the USB connector D+ D- GND to the corresponding pins of the microcontroller, however, I cannot find where the error could be. I also noticed that when I connect the usb cable, I get the interrupt OTG_FS but nothing more than that (like the functions about the capacity of the device etc).  Attached you will find the CubeMX project.


I would appreciate any help!