blink

A small Hello World Rust application for the AVR.

The program itself toggles a LED on PORTB periodically.

Designed for the ATmega328p.

How to set up a cross compiler

Prerequisites

• A recent version of the nightly Rust compiler. Anything including or greater than rustc 1.47.0-nightly (0820e54a8 2020-07-23) can be used.
• The rust-src rustup component - $ rustup component add rust-src
• AVR-GCC on the system for linking
• AVR-Libc on the system for support libraries

Usage

Now to build, run:

rustup override set nightly

# Compile the crate to an ELF executable.
cargo build -Z build-std=core --target avr-atmega328p.json --release

There should now be an ELF file at target/avr-atmega328p/release/blink.elf. It can be flashed directly to an AVR microcontroller or ran inside a simulator.

Resources

• The AVR-Rust book