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A loop that puts you into a deeper sleep that you can be woken up by interrupts from DMA, timers, GPIO etc. would provide the same.

I like Rust as much as the next guy but let's not pretend we couldn't do this with C, C++ or assembly.

You can do this in C, C++, assembly, but my observation is that many projects are started with an RTOS, even if they are cooperative and/or simple.

Technically you could do the same in all three: C, C++ and Rust.