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LBRY Claims • fpga-dev-composite-video-2-hub75e

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21 Feb 2022 17:45:39 UTC
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FPGA DEV: Composite Video -2- HUB75E Adapter Project (256x256 version) on Upduino 3.0 Progress!
(* Video may contain high audio levels for a brief period. Enjoy on stereo headphones at own risk. *)

HI! We're building a pixel-accurate video adapter for composite NTSC standard def video systems (starting with 256x240; ala NES, Sega Master System, SNES) to a HUB75E interface.

(Later I may try a 320x240 capture at 53.693175 MHz) but that's gonna require some 12-bit pixel compression on the Upduino 3.0.)

The secret to pixel-accurate capture is in the high capture rate. For example, it takes 42.96 MHz to capture every phase the NES video processor puts out in sync with it For the Sega Genesis it is 53.693175 MHz.

You may ask why do HUB75E. HUB75E draws lines similar to a CRT raster scan, and the typical delay between video input and light emission is 127 microseconds in my system. This is because there is first a scanline write to memory from the source video to the frame buffer memory, and then a second stage where we pump the display data into the HUB75E shift registers.

As HUB75E panels have both input and output ports, they are intended to be daisy-chained running below 30 MHz (we'll see). Therefore, you can chain up a zig-zag of 8 panels of 128x64 pixels (or 16 panels of 64x64) and connect an entire screen of LED panels with a 16-pin video interface running at 60.1 FPS. Fantastic!

I want to see if light gun games will work on HUB75E LED board tech. The phosphor on a CRT offers an after-glow that the LED panels don't, but I'm *hoping* that the HUB75 system doesn't confuse the Zapper. Like every 32 lines is painted 8 times per frame so that's something, but will there be enough glare and afterglow for it to work like a CRT?

Something good is going to come out of this project.
...
https://www.youtube.com/watch?v=MkpLsuQ2UEA
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