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TWR-K60F120M, TWR-SER2 High Speed USB issues.

Question asked by Michael Collins on Mar 16, 2015
Latest reply on Sep 13, 2015 by Kan_Li

I have run into a problem with the ULPI on my TWR setup.  I am using the TWR-K60F120M, and TWR-SER2.  I have tried porting the USB stack 4.1.1 bare metal K70 ULPI demo over to the K60.  When I plug in the device I get a USB Suspend interrupt, a USB Reset Interrupt followed by 4 Port Change Interrupts spaced 4 seconds apart.  At that point, windows gives a device descriptor failed error.  I have breakpoints and no attempt to read the descriptor  has happened.  I know others have ported this demo to the K60 and was wondering if there is anything special I need to look out for.  I've ensured my debugger isn't an issue by removing its connection to the trace lines.  Looking for any other advice.  Thanks!