microbit contains everything required getting started using Rust to create firmwares for the fabulous BBC micro:bit microcontroller board. This little board has everything and a kitchen sink built-in, even a capable debugging interface.

All you need to start programming this device is:

• A BBC micro:bit board
• A computer (known to work with macOS, Linux and Windows)
• A bit of open source software

The micro:bit comes in different versions. There is a separate crate for each major board version. See the table below to identify which crate you need to use.

Crate	Board version	Board image	Docs	crates.io	target
microbit	V1				thumbv6m-none-eabi
microbit-v2	V2				thumbv7em-none-eabihf

The examples make use of some of the fantastic tooling from the knurling and probe-rs projects. In order to run the examples you need to install probe-rs and flip-link.

> cargo install probe-rs-tools flip-link

The first thing to try is one of the examples in this repository. Plug in your micro:bit and run one of the commands below.

For micro:bit V1

> cargo run --release --manifest-path ./examples/display-blocking/Cargo.toml --features v1 --target thumbv6m-none-eabi

For micro:bit V2

> cargo run --release --manifest-path ./examples/display-blocking/Cargo.toml --features v2 --target thumbv7em-none-eabihf

You should see a lot of build output, the orange LED on the back of the micro:bit should flash quickly, and a message should appear on the LED display.

Congratulations! You've flashed your first Rust program onto your micro:bit!

A guide to embedded development with Rust on the micro:bit using this crate can be found in the MicroRust book.

Other useful resources:

• micro:bit developer community
• micro:bit hardware overview
• nrf-hal the hardware abstraction layer (HAL) this repository is based on

0-clause BSD license.