Re: [avrdude-dev] suggest a "programmer"?

[Erik Walthinsen]

On 02/21/2016 09:42 AM, Nicholas Flowers wrote:
> ACM/Atmel: can't work (requires 5 endpoints, 16U2 only has 4)

If your USB stack can handle the required number of endpoints, I can 
confirm that this will work.  I have a custom programmer device built 
from an Xmega that exposes the STK500V2 interface as well as two CDC's 
(one for controlling the programmer, one talks to the target).  It's 
based on my own custom USB stack (ASF wasn't an option) but from a 
descriptor standpoint it works fine.  The host computer is running 
Linux, which simplifies things of course...