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👋 just released the first public version of libjoybus, an open implementation of the Nintendo Joybus protocol used by N64 and GameCube controllers, with initial support for Pi Pico (1 and 2) and SiLabs Gecko microcontrollers: github.com/loopj/libjoy...

This was initially extracted from the WavePhoenix project with the goal of being more broadly usable. This library supports "host mode", aka acting as an N64 or GameCube console and communicating with a controller, as well as "target mode" aka emulating a controller on the joybus.

The Pi Pico implementation is written from scratch using PIO and fits in a single state machine, so theoretically can support 8 simultaneous buses on a Pi Pico, or 12 (!) on a Pi Pico 2.

This allowed me to do cool things like getting carried away and writing a full protocol-identical reimplementation of the official GameCube controller USB adapter on a Pi Pico: github.com/loopj/libjoy...