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Unknown USB Device (Device Descriptor Request Failed)

Question asked by Junxiao Shi on Dec 27, 2018
Latest reply on Jan 5, 2019 by Junxiao Shi

I want to collect debug logs written by printf statements over USB-UART. However, after I upload any firmware to the USB mass storage device, the device reboots and my Windows 10 computer recognizes it as Unknown USB Device (Device Descriptor Request Failed).

I tried to plug the kit to a Linux computer (RPi 3B), but dmesg shows device descriptor read/64, error -32 and unable to enumerate USB device.

printf is a vital way to debug code without using a SWD debugger. Is there any driver (Windows or Linux-ARM) that I can use to enable USB-UART?

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