Arduino Due programmer debugger


I have install Atmel studio 7 and Visual Micro, and use the Atmel-ice for programming en debugging the Arduino sketches.

I'm looking for an guide how the debugger works.

I have found a video ( Importing Arduino sketches into Studio 7 ) from Bob Martin.
And he says in further videos I go's further on with detailed how looked to In/Out ports and etc.

Bud I can't find the next video's.

So the question is can anyone tell me where I can find these videos, or maybe you can give another tip.

Thanks in advance,