AnsweredAssumed Answered

STM32 Virtual COM port, usb device not recognized "unknown device"

Question asked by zhang.jingyu on Jul 24, 2014
Latest reply on Jul 25, 2014 by senanayake.pradeepa

I'm working on realizing virtual com port on STM32L151 board. After I plug it into PC via usb, there are messages saying "usb device not recognized". I look into computer -- properties -- device manager, it is a "unknown device" and can't be recognized as com port.

I have installed virtual com port driver x64 provided by ST (I'm working on Windows 7 64 bits).

Does anyone have experienced similar things?
How should I fix it?

Thanks forward.