Hi there,

quick update: a couple of days ago I assembled one board, and guess what? As soon as I plugged in the USB cable it enumerated as "ATmega8U2 DFU" so this means that the USB side of the board is working fine.

I also did a really small blink test (which takes 190 bytes if made in raw C using Atmel Studio), setting the fuse bits to use the 16 MHz external clock with no division, and using a delay of 1000 ms between toggling the pin and guess what? It blinks properly, so the chip is overall fine.

I will test MIDI over UART and then I will implement the USB MIDI functionality in the next days.

Bye

Mick

EDIT: the assembled board looks like this:

The board was printed by Smart Prototyping: as you can see the logo on copper came out nicely, and also they didn't use the classic cheap dark green solder mask, but a more clean looking emerald green one, I must say I am really happy. I will post a small tutorial on how to make neat looking logos on copper in KiCad (it's easy as 3.14159265359....)