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?