Get basic USB support working

[payne92]

No description provided.

[larsgk]

Hi Andy,

I will look into this also - please tell me if you already have some early serial comm code (partially) working so I can get an idea of how this should work. I am normally not working this close to the bare metal - but am willing to throw some effort after it :)

Thanks a lot for the project - keeping things simple(-ish) ;)

br
Lars