Merge pull request #837 from antbern/main

implement `embedded_io::ReadReady` and `WriteReady` traits for uart peripheral

Author: thejpster

rp2040-hal/src/uart/peripheral.rs

@@ -490,6 +490,15 @@ impl<D: UartDevice, P: ValidUartPinout<D>> embedded_io::Read for UartPeripheral<
         }
     }
 }
+
+impl<D: UartDevice, P: ValidUartPinout<D>> embedded_io::ReadReady
+    for UartPeripheral<Enabled, D, P>
+{
+    fn read_ready(&mut self) -> Result<bool, Self::Error> {
+        Ok(self.uart_is_readable())
+    }
+}
+
 impl<D: UartDevice, P: ValidUartPinout<D>> embedded_io::Write for UartPeripheral<Enabled, D, P> {
     fn write(&mut self, buf: &[u8]) -> Result<usize, Self::Error> {
         self.write_full_blocking(buf);
@@ -500,3 +509,11 @@ impl<D: UartDevice, P: ValidUartPinout<D>> embedded_io::Write for UartPeripheral
         Ok(())
     }
 }
+
+impl<D: UartDevice, P: ValidUartPinout<D>> embedded_io::WriteReady
+    for UartPeripheral<Enabled, D, P>
+{
+    fn write_ready(&mut self) -> Result<bool, Self::Error> {
+        Ok(self.uart_is_writable())
+    }
+}

rp2040-hal/src/uart/reader.rs

@@ -244,6 +244,12 @@ impl<D: UartDevice, P: ValidUartPinout<D>> embedded_io::Read for Reader<D, P> {
     }
 }
 
+impl<D: UartDevice, P: ValidUartPinout<D>> embedded_io::ReadReady for Reader<D, P> {
+    fn read_ready(&mut self) -> Result<bool, Self::Error> {
+        Ok(is_readable(&self.device))
+    }
+}
+
 impl<D: UartDevice, P: ValidUartPinout<D>> Read02<u8> for Reader<D, P> {
     type Error = ReadErrorType;
 

rp2040-hal/src/uart/writer.rs

@@ -223,6 +223,12 @@ impl<D: UartDevice, P: ValidUartPinout<D>> embedded_io::Write for Writer<D, P> {
     }
 }
 
+impl<D: UartDevice, P: ValidUartPinout<D>> embedded_io::WriteReady for Writer<D, P> {
+    fn write_ready(&mut self) -> Result<bool, Self::Error> {
+        Ok(uart_is_writable(&self.device))
+    }
+}
+
 impl<D: UartDevice, P: ValidUartPinout<D>> Write02<u8> for Writer<D, P> {
     type Error = Infallible;