One day I found that I still cannot use C++20 coroutines in my embedded project (targeted to STM32 MCU). You can do it in Rust using Embassy framework, but no same possibility for C++, despite that C++ coroutines already exist for a long time. So there wasn’t other way than writing one.
I have written one. Also proud of its memory allocator - probably will need to move it to a separate project since it is pretty unique - you can balance between maximal allocation size and block allocation overhead by changing compile-time configuration. In its most compact variant it can have as low as two bytes overhead per allocated block, so it can be used in the tiniest MCUs.
I also have created quite detailed tutorial for the framework:
GitHub repo vagran/pulse-tutorial