cortex-m-rtfm

STM32s have great Rust support[0] if that matters to you. Personally I strongly prefer the embedded_hal[1] and RTFM[2] APIs over the Arduino ones, although the peripheral coverage is a fair bit weaker. Their DISCOVERY kits[3] (preassembled boards that are ready to program, just like Arduinos) are ~$20, and also double as programmers if you eventually end up designing your own boards. [0]: https://docs.rust-embedded.org/discovery/index.html [1]: https://github.com/rust-embedded/embedded-hal [2]: https://github.com/japaric/cortex-m-rtfm [3]: Such as https://www.st.com/en/evaluation-tools/stm32f3discovery.html

If "running multiple tasks on an embedded system that share a stack" sounds interesting to you, Rust's RTFM is actually quite clever[0]. It only works on ARM MCUs right now, but tasks are IRQ triggered, have a priority, memory safe, deadlock-free and have very low overhead. Scheduling is done in hardware via the interrupt controller. [0] https://github.com/japaric/cortex-m-rtfm

It is still pretty early, but if there's been quite a bit of progress this year. This is probably the closest to what you are looking for that exists at the moment: https://github.com/japaric/cortex-m-rtfm You can also follow the Rust Embedded Working Group blog if you wish: https://rust-embedded.github.io/blog/