Ponq - bringing Pong to life with Pynq

RE: Ponq - bringing Pong to life with Pynq

Fred27 — Sun, 12 Jul 2020 13:05:38 GMT

Well, I dropped Adam Taylor an email and despite obviously being busy with so many things he found time out of his weekend to chat to me about this and explore possible sources of the problem over a Zoom call and screen share. We seem to have got to the cause of the problem. I have at least got a direction to head in, if not a perfect solution yet. It turns out that the video stream coming in from the HDMI in isn't quite as perfect as you'd imagine. The stream of pixel data arrives in bursts and there's the occasional gap. This explains why the Test Pattern Generator works fine in both Pynq (via mayplotlib) and HDMI out, but the HDMI in works only when fed into Pynq. Buffering it gives an output that regularly flickers out when the buffer underflows, but I can at least work from there.

RE: Ponq - bringing Pong to life with Pynq

Fred27 — Thu, 09 Jul 2020 12:57:29 GMT

Update: I feel I'm getting closer but still can't quite get it to work. I have converted this guide to HDMI to to work with Vivado 2019.1 and can happily generate an 800x600 HDMI output. I have removed my own IP and have the HDMI-to-Pynq design we created in the work shop processing 800x600 HDMI in from a Raspberry Pi. However, I just can't get the video stream from the Color Convert IP displaying on the HDMI out. I know it's OK as Pynq can display it. The only difference I can see is that the Pynq video stream is working at 142MHz and the HDMI out example uses 100MHz, but I've matched this to the AXI4-Stream to Video Out.

Has anyone managed to get HDMI in feeding through to HDMI out on the Pynq Z2? Adam Taylor's said he's happy to respond to emails, but I feel he's probably busy so I might struggle on a bit longer and leave that as a last resort.

RE: Ponq - bringing Pong to life with Pynq

dubbie — Wed, 08 Jul 2020 08:06:55 GMT

A good project. Getting the numbers onto the video stream is good, I couldn't do it. An automatic scoring system is a good idea though, nobody likes to be the scorer.

Dubbie

RE: Ponq - bringing Pong to life with Pynq

Fred27 — Tue, 07 Jul 2020 10:45:37 GMT

This is obviously still work in progress, but as we've hit the deadline I decided to post my current progress. The first part if it is working well - overlaying 2 scores on an incoming HDMI video - and that seemed like a project in itself!