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USB CDC virtual com example program on TWR70

Question asked by Sue Neal on Feb 23, 2016
Latest reply on Mar 1, 2016 by Sue Neal

I am having problems running this example when I build the example for ddrdata.

If I build for sramdata then the USB enumerates correctly and I can run the example in windows 7

If I build the same program for ddrdata then the USB doesn't enumerate and windows 7 gives an error that the device is unknown.

I get numerous USB_APP_BUS_RESET events but never get the USB_APP_ENUM_COMPLETE event.

I've checked the linker files and the .usb_bdt is set in the sram data and aligned corectly in both linker files - the only difference between the two is the start address

Am running out of things to look for.

Any ideas would be appreciated.