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ADV7842 adjusting gain, brightness, contrast

Question asked by metaleonid on Jan 8, 2018
Latest reply on Jan 15, 2018 by GuenterL

Hello, I'm new to the forum.


I have ADV7842 board which I would like to use to digitize analog video signal from either composite source or S-Video.

I connected the output of the board to the HDMI capture card and it is doing what it is supposed to do.


However, I want to change a few settings. I'd like to set gain to be manual and not automatic. 

On top of that I would like to be able to change gain value, brightness and contrast.


If the experts could provide me a sample script how to change the above values, I would really appreciate it.


Can you please provide me with default value for each: gain, brightness and contrast. Also what is the step value for each of those? And what is the maximum and minimum value for each of those?


My understanding is that both brightness and contrast are split up into 2 registers, correct?