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Hi, Support,

Question asked by Stone Shi on May 9, 2018
Latest reply on May 16, 2018 by Stone Shi

I am suffering a problem of USB DFU on MK20DN512VLL10,  when I connect cable to PC, the PC always show "unknown USB device" rather than recognize it. 


 1. my DFU firmware can do  USB_Reset_Service() function, but after it, it seems do nothing.

2.  I set a break point at get descriptor function, but it doesn't break, so I think my firmware didn't receive the get_descriptor command. 


  what can I do next to fix  the problem? please help. thank you!