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I confirmed that, on my old hardware prototype, the display works with the Rust firmware I developed.

On my PCB, on the other hand, with minimal changes (pin changes), it's just snow.

I remember that I also had that problem when I first wired up the prototype, and the problem was a wrong "busy" pin, I think. So I still think it could be wrong pins? But I gotta investigate more.

@revk @twilliability