use uvc as primary camera

[MarkHaysHarris777]

Often the microusb port is also an OTG port;  NOT ON THE PINE.  The microusb connector is only a power plug !

Both of the usb ports are usb2.0 and can be used for things like drives, keyboards, and even cameras;  however, only the bottom  top port can be used OTG (the usb port closest furthest from the board).

( I edited the previous post to avoid confusion )

And yet, there is confusion about this.  The upper usb port (furthest from the board) is the FEL port; sometimes confused with the OTG hardware port.  (in a previous post even tllim was confused about this, and I'm still fuzzy on it too)

Of course a normal OTG port will have an ID pin.  The ports on the pine are type A four pin (+5, D+, D-, ground) and do NOT have the id pin (like a five pin microusb OTG port).  Consequently, whether you can REALLY use either port as a real OTG port is sketchy at best.  

The schematics show no difference in the ports electrically;  only that ONE of the ports is wired to the OTG hardware/   so........  the top port.

This was the Pine choice to provide two usb2.0 ports for most user's flexibility rather than providing one REAL OTG port with ID pin which might have been used for booting from the usb!

Note:  and having said all of that...  if the FEL port is REALLY the OTG hardware port, that needs to be documented -- and in that case the top port (furthest from the board) is the REAL OTG port.