I'm struggling to get my USB device code (developed on the Stellaris Launchpad) to work on the Tiva Launchpad. Most of the postings indicate code should work "as is" but when I program working code to my Tiva board the USB device never connects (and Windows doesn't indicate it sees a device). I swap it with a Stellaris Launchpad (with no other changes) and the project works correctly.
Is there a hardware difference that would affect things? As I understand it the Tiva USB mode defaults to device so I wouldn't expect anything there. I can provide example code but you can see the same behavior if you program the Tiva with the TI provided usb_dev_serial example that came with StellarisWare in the boards\ek-lm4f120xl folder.
Any help would be appreciated, I have tried comparing the code to the new Tivaware examples but can't find the smoking gun among the many changes.