biscuit: Open-source firmware for the Xteink X4 e-paper device
Summary
Biscuit is an open-source firmware project that repurposes the Xteink X4 e-paper reader into a multifunction device with a tile-based dashboard and eight apps. It provides hardware specs (ESP32-C3, 4.26-inch display, WiFi/BLE, SD storage), installation steps, and a modular architecture derived from CrossPoint Reader. The repo emphasizes a developer-friendly workflow and security-conscious features.