64x64 Led Panel Matrix HUB75E Pio programming

[mxclouti]

Hi. I'm new to micropython and the rp pico, but I've been programming for more than 35 years now !

I'm using VS Code.

Now, I'm trying the display something on my 64x64 Led Matrix HUB75E using PIO programming.

I'm pretty sure all the wiring is ok because I was able to display something on the matrix using a non-pio version.
The matrix won't display all green pixels with the pio version.
See code attached.

Thanks.

matrix6464Hub75e.py.txt

[mendenm]

Does it behave differently if you drop the PIO clock from 20 MHz to 1 MHz, for example? ringing on wiring can be a real problem at 20 MHz. This is only a relevant question, of course, if your non-PIO version was clocking data at 10 MHz, which is the data rate you have with the PIO.

I also note that you are both programmatically pulling and autopulling, so it seems as if you might be losing every other word, since when the 4th out(pins,6) executes, you will hit the autopull threshold, pull a word, and then trample that word with the manual pull.