Add serial::Write implementation

src/serial_impl.rs

@@ -2,7 +2,7 @@
 
 
 use nb;
-use ::hal::serial::Read;
+use ::hal::serial::{Read, Write};
 use ::serial;
 
 /// Newtype around [`serial::SystemPort`] that implements the `embedded-hal` traits
@@ -24,6 +24,23 @@ impl Read<u8> for Serial {
     }
 }
 
+impl Write<u8> for Serial {
+    type Error = serial::Error;
+
+    fn write(&mut self, word: u8) -> nb::Result<(), Self::Error> {
+        use std::io::Write;
+        self.0.write(&[word])
+            .map_err(|err| nb::Error::Other(Self::Error::from(err)))?;
+        Ok(())
+    }
+
+    fn flush(&mut self) -> nb::Result<(), Self::Error> {
+        use std::io::Write;
+        self.0.flush()
+            .map_err(|err| nb::Error::Other(Self::Error::from(err)))
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::*;