...the programming port is powered; I can charge my phone over it! It's not supposed to power the programming port, right?
It should not even be possible to make such a connection: the usb spec only defines these cables for this use:
1. micro B plug to standard A plug (the regular pc to phone cable).
2. micro A plug to standard A receptacle (what massimo referred to)
3. micro A plug to micro B plug (never seen this for sale)
You can plug cable 1 into cable 2, then you end up with the same thing as cable 3. So you always end up with an A plug on one end and a B plug on the other. The B plug goes in the phone. The A plug has a rectangular section and should only fit in the native usb port (micro AB connector) of the due. It should not fit in the programming port (micro B connector, trapezium shaped section)
So how did you make the connection?
- did you put the A end in the (otg capable?) phone?
- do you have a non std cable? (on ebay I saw cables that look like standard A receptacle to micro B shaped plug, but it is difficult to tell from the pictures)
- does the due have a micro AB connector (rectangular shape) for the programming port? (I am still waiting for my due, so I can't see for myself)