lilos

This is a wee operating system written to support the async style of programming in Rust on microcontrollers. It fits in about 2 kiB of Flash and uses about 40 bytes of RAM (before your tasks are added). In that space, you get a full async runtime with multiple tasks, support for complex concurrency via join and select, and a lot of convenient but simple APIs. (If you want to see what a lilos program looks like, look in the examples directory, or read the intro guide.)

lilos has been deployed in real embedded systems since 2019, running continuously. I've built about a dozen systems around it of varying complexity, on half a dozen varieties of microcontroller. It works pretty okay! Perhaps you will find it useful too.

See the repository for example code and getting started instructions, or the Rustdoc on the top level lilos module for API details and descriptions of modules.