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How do I read from the ADV7850 to get the info of analog video input?

Question asked by JohnsonLiu on Dec 11, 2017
Latest reply on Dec 18, 2017 by JohnsonLiu

Hi,

 

I have a support resolutions list and I need the select the right analog resolution among the list automatically.

I read some registers from ADV7850 for the analog video info.(VGA, Component, Composite and S-Video ).

 

I've tried to read the

BL (0x44, 0xB1/0xB2),

FCL (0x44, 0xB8/0xB9),

LCF (0x44, 0xB3/0xB4)

and Vsw values (0x44, 0xB3),

but the register values don't change with the different input video format.

It always returns the value which I set last time.

 

How do I read from the ADV7850 to get the info of analog video input?

Or what I miss to set in ADV7850 before I read the video info?

 

Thanks.

Johnson.

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