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It doesn't rotate by degrees because the trig functions you are calling take their input in radians. Try anglevariable = i * PI / 180.; As for reading a texture, perhaps it's easier to point you at some code which does that. Every 2 seconds that swaps between nearest-neighbour and bilinear...

Thanks for your detailed response, John. Adding PSRAM was nerve-wracking enough for my tastes. I'll leave the MLK02 where it belongs. Much as I'd love to play with it, I can't justify buying a devkit for this little hobby project. SerialDebug looks like it will suffice for my needs.

A major contributing factor in choosing a T4.1 for my current project is that I remember seeing a photograph of the DC, DD and DE pins on the back of the board. Curse my imperfect memory! That was a T3.6 I was remembering, and those pins are gone on T4.x. I've spent a couple of hours looking...