Trying to drive dual-color 16x16 panel - but is it possible?

[ctkjedi]

I've got a bi-color (red/green) sign that consists of 4 panels. Each panel is 16 cells x 16 cells, but each cell contains 2 LEDs, a red and a green. The only documentation I could find suggests that they are 1/4 duty panels, so after getting my pinouts straight, and omitting anything unused (blue channel, C, D, E) I got things sorta working. I loaded in the Pixel Mapping example for testing just a single panel, but what I get filling in is just, weird. Basically, it's filling in things out of order and skipping lines only to return to them later. I've tried different combos of panel dimensions (should it actually be 32x16, cuz there's two LEDs per cell?) and setting the clk phase to false.

20250717_134010.mp4

Further pics here: https://imgur.com/a/hub75-led-panels-0V02D5t

[mrcodetastic]

Yeah. This library isn't designed to generate the right binary output for these types of panels so any appearance of working is purely luck.

You'd have to make a custom version of this library to get it to work for these panel.

[ctkjedi]

Which I know absolutely nothing about. Thanks for takin a look though.

[board707]

@mrcodetastic
The binary output needs for such panels is exactly the same as for RGB ones, just without the third color.

[ctkjedi]

@mrcodetastic The binary output needs for such panels is exactly the same as for RGB ones, just without the third color.

So are you suggesting I might not be out of luck?