This is my first project trying to write embedded rust and my first time working on a project larger than one crate. I'm trying to write software for my Arduino in Rust. I've found Rahix's template which runs a simple blink program without any extra setup.
I've found Ferrous System's blog post on Testing an embedded app and tried adapting their project structure to mine, but I'm not familiar enough to know what I need to change on my project.
As far as I understand, I need to have a top-level workspace which contains three crates:
- cross - contains the
main.rsfile that runs on the Arduino. This is a
#![no_std]crate and imports the logic crate
- logic - contains all the interesting things that will run on the Arduino and get unit tested. This is a
- local - contains all the unit tests for the project. This is a
stdcrate. It imports the logic crate, and could, in principle, contain a
main.rs, but I don't see how that's useful in this setup.
I got as far as putting Rahix's template as the cross crate, but then I get errors like:
LLVM ERROR: Expected a constant shift amount! error: could not compile `core` (lib)
if I compile in release mode, and
error: ran out of registers during register allocation
if I just do a normal
I've tried looking up these errors, but I'm not sure if I'm even going down the right path. Does someone have guidance on how to adapt my project, a different technique, or other resources I can look at?