My atmel studio project has only one thing left to do - get USB working.
So far, the USB (other than drawing power from the host) has been completely and totally inert. I can see no evidence that it's communicating with the host in any way.
I suspect the USB hardware works because if I have the chip (ATSAMS70N19) boot from ROM, SAM-BA works properly, including showing up as a high-speed device.
Can someone look at my .atstart file and tell me if I've made any rookie mistakes therein? If I can at least get the example MS device code to even attach properly, I think I could work the rest of it out.