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So, how can I switch from sync only to overlay and d1 to v input in software. I assume I’d need more hardware.
I found the problem. It was a bad solder joint on D1. It’s amazing how long I had to stare at the board before I saw it.
Thanks for your time.
But it should run the regular TVOut stuff without the chip, right? So that isn’t it. I must have screwed up the board somehow. I’m getting the black screen but no text.
When I first tried the board it worked as expected but needed an external video source even on ‘sync only’.
Apparently my board wasn’t acting to spec. I was able to get the demo output over a blank screen by switching output select to sync only, and the mixed output on overlay but d9 input didn’t work, I had to use an external source, I guess for the sync signal. Now I’m not getting program output in either mode. In overlay mode I get the unchanged input video and in sync only I get nothing.
As I read further it looks like the original tvout will do what I’m talking about. I could make a duino for the tvout and mount it on top of your board. The remaining questions are; can I switch between video inputs electronically and can I use a cheap oscillator on the duino or do I have to use a crystal?
