fangduAssociate10 years agoMarch 4, 2016QuestionSTM32 F4 discovery USB audio program0 replies484 views Posted on March 04, 2016 at 21:12Hi All,I am now trying to building a USB sound card with microphone.When I use USBlyzer to monitor the usb communication, it didn't have ''set configuration'' and start fails.which part is wrong?Thanks.