2x ivport_v2 boards working together is likely not to work as designed

[jdaniellhebert]

I have reached the conclusion that 2x ivport_v2 (4 camera) boards will not work as currently intended. There is a conflict between the analog mux output lines on the boards in hardware.

In the process of doing this work I have managed to repeatably get 4x cameras to work on one board with data coming out of the second board input connector. Conversely, I have been able to repeatably get data from 2x cameras on the second board to come out of the input connector on the first board. I have also managed to get both boards to work independently at different gpio and IIC mux addresses.

I have documented all of this, including my reverse engineering of the board, theory of operation and working test code:

https://github.com/jdaniellhebert/ivport_4.