Add async API for CAN

embedded-can/CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - Added `core::error::Error` implementations for every custom `impl Error`
 - Increased MSRV to 1.81 due to `core::error::Error`
+- Add async API.
 
 ## [v0.4.1] - 2022-09-28
 

embedded-can/src/asynch.rs

@@ -0,0 +1,26 @@
+//! Async CAN API
+
+/// An async CAN interface that is able to transmit frames.
+pub trait CanTx {
+    /// Associated frame type.
+    type Frame: crate::Frame;
+
+    /// Associated error type.
+    type Error: crate::Error;
+
+    /// Puts a frame in the transmit buffer or awaits until space is available
+    /// in the transmit buffer.
+    async fn transmit(&mut self, frame: &Self::Frame) -> Result<(), Self::Error>;
+}
+
+/// An async CAN interface that is able to receive frames.
+pub trait CanRx {
+    /// Associated frame type.
+    type Frame: crate::Frame;
+
+    /// Associated error type.
+    type Error: crate::Error;
+
+    /// Awaits until a frame was received or an error occurs.
+    async fn receive(&mut self) -> Result<Self::Frame, Self::Error>;
+}

embedded-can/src/lib.rs

@@ -2,7 +2,9 @@
 
 #![warn(missing_docs)]
 #![no_std]
+#![allow(async_fn_in_trait)]
 
+pub mod asynch;
 pub mod blocking;
 pub mod nb;