E-Paper Panel Isn't Broken: How Retained State Makes Drivers Look Buggy

Your E-Paper Panel Isn't Broken: How Retained State Makes Drivers Look Buggy 2026-08-24 · msj's blog I spent an afternoon fixing three bugs in an e-paper driver. None of them existed. The driver was epdsi, a no_std Rust framework I maintain for electronic paper displays. I was porting a working example from an RP2350 to an ESP32-C3 — same driver crate, same panel, different board. It should have been a twenty-minute job. It took most of a day, and the code I ended up shipping was,