My target is a atmega32u4.
I can connect to it with JTAG and a USB cable.
As a practical matter, that is it.
My immediate goal is to make LUFA work at all:
A CDC that will emit ABC... at one character per second.
There isn't much else for it to do.
I've used LUFA before, starting when it was still MyUSB,
and that makes me want to try it again.
My recollection is that it wasn't too hard to use once one got used to it,
but right now I'm wheel-spinning.
I'm open to suggestion.
I tried building the Virtual Serial demo with BOARD=USER,
but it choked on a missing header file, undefined LEDs and stuff.
It looked like fixing it would be a lot of work and I don't know what it does.