I'm dabbling in some embedded programming with a raspberry pi Pico and a little 3.5" lcd screen. After a LOT of finagling I've managed to get the screen to turn on and accept simple commands like turn on/off all pixels.

But now I'm stumbling on sending actual color data to it. I have a c program that works and have tried mirroring it to rust but for some reason it's no good. Struggling to figure out what the difference is, since I had other commands working fine in rust.

I don't have a debugger setup or an oscilloscope. Only some serial output. Painful debugging environment.