The other day, I stumbled upon RMK, a keyboard firmware written in Rust. Given that my Ferris Sweep has a Ferris the crab logo on the silkscreen, it felt only fitting that I flash it with RMK. Since I first built it, my Ferris Sweep has been running QMK, a very mature C-based keyboard firmware. QMK is a great project, and doing basic keymaps for an already-supported keyboard is straightforward and well-documented.