1 unstable release
0.1.0 | Oct 7, 2024 |
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#1335 in Embedded development
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12KB
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A minimal async runtime for Cortex-M microcontrollers
This crate provides a minimal async runtime for Cortex-M microcontrollers. It's based on the tutorial by Phil Opperman, Writing an OS in Rust. The runtime is designed to be as simple as possible, while still providing a good foundation for building async applications on Cortex-M microcontrollers.
Note that this is a project for learning purposes and is not intended for production use. For a more complete async runtime, consider using the Embassy Project. Also consider using RTIC for building real-time applications on Cortex-M microcontrollers.
Minimal Example
#![no_std]
#![no_main]
use cortex_m_asyncrt::os::{self, executor, init_heap, Task};
use cortex_m_rt::entry;
use cortex_m_semihosting::{dbg, hprintln};
// use panic_probe as _;
use panic_semihosting as _;
#[entry]
fn main() -> ! {
init_heap();
hprintln!("Hello, worlds!");
// New executor that can run up to 64 tasks
let mut executor = executor::Executor::new::<64>();
// Spawn a task
executor.spawn(Task::new(example_task()));
// Run the executor
executor.run();
// This code is unreachable because the executor.run() function runs tasks to completion.
loop {}
}
async fn example_task() {
// your code goes here
let r = example_fn().await;
hprintln!("r = {}", r);
}
async fn example_fn() -> u32 {
42
}
Compile and run the example with qemu.
qemu-system-arm -cpu cortex-m4 \
-machine lm3s6965evb \
-nographic \
-semihosting-config enable=on,target=native \
-kernel target/thumbv7em-none-eabihf/release/qemu-test
You should see the following output:
Hello, worlds!
r = 42
Dependencies
~1.3–1.8MB
~29K SLoC