traits: add idle trait

embassy-traits/src/uart.rs

@@ -10,6 +10,15 @@ pub enum Error {
 pub trait Uart {
     type ReceiveFuture<'a>: Future<Output = Result<(), Error>>;
     type SendFuture<'a>: Future<Output = Result<(), Error>>;
+    /// Receive into the buffer until the buffer is full
     fn receive<'a>(&'a mut self, buf: &'a mut [u8]) -> Self::ReceiveFuture<'a>;
+    /// Send the specified buffer, and return when the transmission has completed
     fn send<'a>(&'a mut self, buf: &'a [u8]) -> Self::SendFuture<'a>;
 }
+
+pub trait IdleUart {
+    type ReceiveFuture<'a>: Future<Output = Result<usize, Error>>;
+    /// Receive into the buffer until the buffer is full or the line is idle after some bytes are received
+    /// Return the number of bytes received
+    fn receive_until_idle<'a>(&'a mut self, buf: &'a mut [u8]) -> Self::ReceiveFuture<'a>;
+}