If you are using Nix with flakes enabled you can just run nix develop, it will put you into the shell with all software dependencies included.

Otherwise you need to install:

• a relatively recent version of Rust
• probe-rs: e.g. through cargo binstall probe-rs-tools

To make flashing STM not require root permissions you can add the following rules to udev. They allow reading and writing to STLINK devices for all users.

# STLINK
SUBSYSTEMS=="usb", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="374b", MODE="0666"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="3754", MODE="0666"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="374e", MODE="0666"

Provided you have everything installed, you can just run the following commands to compile, flash and execute code on STM32U545RE:

cargo run --release # To run in release mode
cargo run           # To run in debug mode

Tests in test/ directory can be run with:

cargo test --release
cargo test

Similarly to cargo run, this will compile, flash and execute test code. Between each test the microcontroller is restarted.