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USB High speed problem K20 120 MHz

Question asked by kamran sial on May 24, 2014
Latest reply on May 24, 2014 by Mark Butcher

I am using kinetis k20 microcontroler to run example code high speed hid device of K70 from Freescalw usb stack v4.1.1. I have changed the header files and removed some errors when i connect the usb with the pc it says enumeration failed and when i run it in debug mode it is constantly in interrupt service routine of usbhs. in isr i read USBHS_USBSTS register and it gives 0x01C4.

can anybody tell me why it is in interupt service routine constantly?