blink

A small Hello World Rust application for the AVR.

The program itself toggles a LED on PORTB periodically.

Designed for the ATmega328p.

The AVR-Rust Book

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

Ensure time delays are consistent with a 16MHz microcontroller.
export AVR_CPU_FREQUENCY_HZ=16000000
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

Resources

• The AVR-Rust book