May I know if ADV7842 provide video source input auto detector?the display can auto output if there is signal in channel, if yes, which channel if first?
Thanks and best regards,
The ADV7842 cannot auto-program itself and display an image. It can detect if there is a valid signal and measure it if you set it up to do that though.
I have two ADV7842 devices.
First device has a DVI input and an analog RGB input (basically VGA).
Second device has an HDMI input an a CVBS input.
How do I:
Once I know this information, I can setup PRIM_MODE and VID_STD.
I'm particularly curious about #1 because I'm guessing #2 can be done using the STDI block in the CP. I'm also guessing the SDP must be able to detect the format of a CVBS input. But I'm not sure how to determine what type of signal is present so I can route the video to the correct processor and setup PRIM_MOD/VID_STD properly.
Let me know where to look, thanks!
For HDMI, it's relatively straightforward as there is a status register in the HDMI map, 0x04 I think, which will tell you if the PLL is locked and an even more basic detection is the +5 V detect in CABLE_DET_A/B_RAW registers in the IO Map.
For Analog inputs, I don't think there is as easy a way. You'd at least need to know which Synch inputs you are using and then set up the synch mux in the SSPD to process them since it has an activity read back for the synchs you could use. Otherwise if there was no activity on HDMI, you'd just need to cycle throught the PRIM_MODE/VID_STD scripts for the different possible analog configurations to see if they were active.
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