japaric/f3

Async IO

japaric opened this issue · 4 comments

japaric commented

As a first experiment: Future::poll based and interrupt free.

The unresolved question is how to make the microcontroller sleep? I usually use wfi when there's nothing to do but that will block forever if no interrupts are being used.

getreu commented

I have seen with interest your aio-concurrent.rs example in your aio branch. You have not followed this branch. I guess you are not satisfied with this approach. Why?

BTW, an event loop with tokio-core looks like this.

loop {
    // Learn what the next "event" was, blocking if none available
    let event = next_event();

    // Dispatch this event, following it through to completion
    dispatch(event);
}

Is it possible to do something similar?

Or, can you use tokio or tokio-core on these devices? When would it make sense?

japaric commented

@getreu I'm exploring a more "reactive" / "event driven" approach based solely on interrupts but I have nothing to show ATM.

I can't comment on tokio-core as I have not checked it in detail. My understanding is that it doesn't compile on no_std, so there's that.

getreu commented

@japaric thank you for your answer. I am looking forward to learn more from your publications.

japaric commented

This crate now has async support via the macros in the nb crate. WFI is still a problem. I have an imperfect solution in mind that'll cover in a blog post (but not any time soon).