rmk

A feature-rich Rust keyboard firmware.

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Features

• Support a wide range of microcontrollers: Powered by embassy, RMK supports a wide range of microcontrollers, such as stm32/nRF/rp2040/esp32
• Real-time keymap editing: RMK has built-in Vial support, the keymap can be changed on-the-fly. You can even use Vial to edit keymap over BLE directly
• Advanced keyboard features: Many advanced keyboard features are available by default in RMK, such as layer switch, media control, system control, mouse control, etc
• Wireless: BLE wireless support with auto-reconnection/multiple devices feature for nRF52 and esp32 microcontrollers, tested on nRF52840, esp32c3 and esp32s3
• Easy configuration: RMK provides a simple way to build your keyboard: a keyboard.toml is all you need! For experienced Rust user, you can still customize your firmware easily using RMK
• Low latency and low-power ready: RMK has a typical 2 ms latency in wired mode and 10 ms latency in wireless mode. By enabling async_matrix feature, RMK has very low power consumption, with a 2000mah battery, RMK can provide several months battery life

User Documentation | API Reference | FAQs | Changelog

Real World Examples

rmk-ble-keyboard

dactyl-lynx-rmk

Usage

Option 1: Initialize from template

You can use rmk-template to initialize your project.

cargo install cargo-generate flip-link
cargo generate --git https://github.com/HaoboGu/rmk-template

Then follow the steps in generated README.md. Check RMK's User Guide for details.

Option 2: Try built-in examples

Example can be found at examples. The following is a simple step-to-step instruction for rp2040. For other microcontrollers, the steps should be identical with a debug probe.

rp2040

1. Install probe-rs

   curl --proto '=https' --tlsv1.2 -LsSf https://github.com/probe-rs/probe-rs/releases/latest/download/probe-rs-tools-installer.sh | sh
   

2. Build the firmware

   cd examples/use_rust/rp2040
   cargo build
   

3. Flash using debug probe

   If you have a debug probe connected to your rp2040 board, flashing is quite simple: run the following command to automatically compile and flash RMK firmware to the board:

   cd examples/use_rust/rp2040
   cargo run
   

4. (Optional) Flash using USB

   If you don't have a debug probe, you can use elf2uf2-rs to flash your rp2040 firmware via USB. There are several additional steps you have to do:

   1. Install elf2uf2-rs: cargo install elf2uf2-rs
   2. Update examples/use_rust/rp2040/.cargo/config.toml, use elf2uf2 as the flashing tool

      - runner = "probe-rs run --chip RP2040"
      + runner = "elf2uf2-rs -d"
      

   3. Connect your rp2040 board holding the BOOTSEL key, ensure that rp's USB drive appears
   4. Flash

      cd examples/use_rust/rp2040
      cargo run
      

      Then, you will see logs like if everything goes right:

      Finished release [optimized + debuginfo] target(s) in 0.21s
      Running `elf2uf2-rs -d 'target\thumbv6m-none-eabi\release\rmk-rp2040'`
      Found pico uf2 disk G:\
      Transfering program to pico
      173.00 KB / 173.00 KB [=======================] 100.00 % 193.64 KB/s  
      

Roadmap

Current roadmap of RMK can be found here.

Minimum Supported Rust Version (MSRV)

This crate uses latest stable. Other versions should work, but they're not tested.

License

RMK is licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.