Open Source options for RGB to HDMI

A combination of Analog Device's AD9983 + ADV7513 might work.

Both chips seem to have limited supply at some distributors. The AD9983 is not recommended for new designs, but from your former posts, your project isn't exactly new either.

And I am not sure how much configuration those chips need to make them do what you want.

- W.

PS: I was looking at those chips for a composite video to HDMI solution, but that would need another step of composite to RGB first and I never prototyped it. And if it is really a one-off, you can always buy an eval board and 'borrow' the chip from there.

I initially came across the ADV7513. But lack of access to (real) datasheet is what made me realize I might not be able to gain access to the resources I need.

As I think about your suggestion, though, I might be able to skip the ADC. The signals I get from the MEGA-II are a digital RGB sequence. So, I can probably skip converting it to analog just to get them converted back to digital. I will, probably, need to change the digital RGB sequence I get into something a chip like the ADV7513 understands.

Something like this in chip form?

https://www.ebay.ca/itm/144137191329?hash=item218f3effa1:g:t3oAAOSwZrhhCK5L

It is an interesting idea. That takes Component video which is Luma-based. I have considered buying something similar that takes in RGB, and tearing it apart.

There is probably a cheap SCART-to-HDMI adapter that supports RGB.

That approach means some reverse engineering (and hope.) This project is already pretty RE heavy as it is.

Please correct me if I am wrong but isn't the use of HDMI propriety and requires licensing?

I am far from being an expert. I recall having issues one time with a device to television sets. The device didn't support HDMI and I made an inquiry to the vendor. They didn't want to spend the money to license the technology. Now they could have been blowing smoke up my *** to discourage me.

I thought I was clear in my original question.

I'm looking for options to implement HDMI into a project, which will not be sold, without getting a license.

baldengineer 

With digital RGB, this one might be an option:

Chrontel CH7035. I can't look at more details right now, because it is hosted in China, but there is a project over at Hackaday.io that uses the chip and might be able to be reverse engineered.

https://hackaday.com/2019/07/26/hdmi-from-your-arduino/

Buying one might be a challenge too.

Excellent find Wolfgang! With a brief look, I believe this is what I am after. I'll investigate the datasheet a bit more later.

It does look like there are a few suppliers on the grey market that offer them. Not my preferred acquisition method, but I probably have no other choice in this case.

Yeah, findchips.com only shows one German distributor, that only sells full trays of 168 pieces. If you want to go into mass production, I could help with the translation.