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stm32f4 USB HID not detected by pc

Question asked by YONGAN ZHANG on Aug 7, 2017
Latest reply on Aug 10, 2017 by YONGAN ZHANG

I am testing out the USB HID (otg fs) feature of my board with stm32f407vet6 mcu. I used stm32cubemx to configure it and i didn't add anything to the while loop in main c, just seeing if the device can be detected or not. However, after I uploaded  the code  and resetted the board, no response was given and I could not find any relevant port in the device manager of my pc.  The attached are the schematic for the usb_slave port and configuration in stm32cubemx.usb otg