async-hal

Async hardware abstraction layer for embedded devices

Examples

Blinky

use async_hal::delay::DelayMs;

let mut led = _;
let mut timer = _;

loop {
    led.toggle();
    timer.delay_ms(1_000).await?;
}

Serial port loopback

use async_hal::io;

let mut serial_tx = _;
let mut serial_rx = _;

loop {
    io::copy_buf(&mut serial_tx, &mut serial_rx).await?
}

lib.rs:

Async hardware abstraction layer for embedded devices. This crate provides zero-cost utilities for async IO with #![no-std].

Two execution models are provided:

• Interrupt mode: Multiple interrupts can each run a future using an Executor. Each future is polled on every interrupt and channels can be used to communicate between them.

• Thread mode: Interrupts wake a main function where a future is being polled with block_on.

Installation

The easiest way to get started is to enable all features.

[dependencies]
async-hal = { version = "...", features = ["full"] }

Or by using cargo add

cargo add async-hal --features full

Feature flags

Async-hal uses a set of feature flags to reduce the amount of compiled code. It is possible to just enable certain features over others. By default, async-hal does not enable any features but allows one to enable a subset for their use case. Below is a list of the available feature flags. You may also notice above each function, struct and trait there is listed one or more feature flags that are required for that item to be used. If you are new to async-hal it is recommended that you use the full feature flag which will enable all public APIs. Beware though that this will pull in many extra dependencies that you may not need.

• full: Enables all features listed below except mock and bxcan.
• can: Enables the async_hal::can module.
• delay: Enables the async_hal::delay module.
• executor: Enables the async_hal::executor module.
• io: Enables the async_hal::io module.
• serial: Enables the async_hal::serial module.
• nb: Enables async wrappers for non-blocking interfaces (such as from embedded_hal).
• bxcan: Enables CAN support for stm32 devices with bxcan.