AnsweredAssumed Answered

ADV7842 BL and LCF registers

Question asked by jbolduc01 on Mar 26, 2015
Latest reply on May 8, 2015 by DerekBurke

Hello,

I would like to know a reliable way to detect the VGA input on this part. I see that the LCF register is not very accurate according to the real total pixels value. For example, when inputting a 1280x720p60 format, I read 745 in this register.

 

Also, when inputting 1680x1050 or 1400x1050, I have almost the same values for LCF and BL.

 

I also noticed that when using different sources, I do not get the same values. This is a problem since our device can be connected to different sources.

 

I added a tolerance in my firmware in order to detect properly the input resolution but I'm concerned that some sources will just not work.

 

Thanks,

 

Jérôme

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