Electronics > Projects, Designs, and Technical Stuff
Need to build On-screen display for VGA
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Yansi:
Keep your cheeky comments for yourself. Nobody asked for them and nobody forces you to help on this forum for free, if you think you have better jobs to do.

I have just asked for specific part numbers to help isso with his project. Do you see anything wrong with that?

//EDIT: ADV7611 is an example of a "closed under NDA and paywall" type of part.
isso:
Wow, this thread's been quite busy  :-+  Thanks for all the useful info, I'm doing more research based on your input now.
After I'm done with OSD for VGA, my next task will be OSD for HDMI, so all of the related information that's been posted here is appreciated.

@NiHaoMike - you mentioned there were HDMI ASICs with overlay support, I'd really appreciate some part numbers if you have any. Thanks!
NiHaoMike:

--- Quote from: isso on February 07, 2019, 01:31:20 pm ---@NiHaoMike - you mentioned there were HDMI ASICs with overlay support, I'd really appreciate some part numbers if you have any. Thanks!

--- End quote ---
sil9687 is commonly found in PIP splitters and is one I really would like to find the register map for in order to be able to hack that sort of splitter for PC control using an Arduino.
Berni:
Sorry didn't mean to sound rude. Just that when you have the manufacturer you can quite quickly find a list of chips for the job on there website and choose what suits the job the best.

We used one of the HDMI receiver chips from TI and its not really that much of a hassle. Datasheets are available, chips are easy to buy from the big component vendors. But yeah the chips are not the cheapest out there and they have a rather high power consumption. For some reason i noticed the high power consumption being a common trend with HDMI chips, there is not sll that much processing going on in there do i don't see why that is the case.

In the case of confidential documentation its often not that hard to get it if you just ask them for it. As long as you look like you are a company its fine.

Sometimes getting the documentation just involves digging the internet really deep. There have been cases where i pieced together a LCD controller datasheet from datasheets of multiple other similar displays, or found a linux driver for a undocumented controller chip and reverse engineered the info out of the linux kernel driver source code for it. Also for example to get MIPI video output working on a Raspberri Pi i reverse engineered the display detection by connecting a real display and probing what its doing.

So lack of easily available documentation is not always a showstopper, but it does sometimes mean a good deal of extra work.
Yansi:
Hence why I have asked for an IC recommendation, so one could avoid such digging, as probably some of us may have experience with some ICs, that have good stock (and documentation) availability.


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