implement embedded_io::ReadReady for Uart & UartRx (esp-rs#1702)

* implement `embedded_io::ReadReady` for `Uart` & `UartRx` * update CHANGELOG.md
liebman · Jun 21, 2024 · 9691141 · 9691141
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diff --git a/esp-hal/CHANGELOG.md b/esp-hal/CHANGELOG.md
@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add Flex / AnyFlex GPIO pin driver (#1659)
 - Add new `DmaError::UnsupportedMemoryRegion` - used memory regions are checked when preparing a transfer now (#1670)
 - Add DmaTransactionTxOwned, DmaTransactionRxOwned, DmaTransactionTxRxOwned, functions to do owning transfers added to SPI half-duplex (#1672)
+- uart: Implement `embedded_io::ReadReady` for `Uart` and `UartRx` (#1702)
 
 ### Fixed
 

diff --git a/esp-hal/src/uart.rs b/esp-hal/src/uart.rs
@@ -1662,6 +1662,28 @@ where
     }
 }
 
+#[cfg(feature = "embedded-io")]
+impl<T, M> embedded_io::ReadReady for Uart<'_, T, M>
+where
+    T: Instance,
+    M: Mode,
+{
+    fn read_ready(&mut self) -> Result<bool, Self::Error> {
+        self.rx.read_ready()
+    }
+}
+
+#[cfg(feature = "embedded-io")]
+impl<T, M> embedded_io::ReadReady for UartRx<'_, T, M>
+where
+    T: Instance,
+    M: Mode,
+{
+    fn read_ready(&mut self) -> Result<bool, Self::Error> {
+        Ok(T::get_rx_fifo_count() > 0)
+    }
+}
+
 #[cfg(feature = "embedded-io")]
 impl<T, M> embedded_io::Write for Uart<'_, T, M>
 where