Add embedded_hal example

examples/embedded_hal.rs

@@ -0,0 +1,21 @@
+//! This example does not actually do anything, but it shows that a serialport
+//! instance can be passed to functions / drivers that expect a type that
+//! implements the embedded-hal traits.
+
+use embedded_hal_nb::serial;
+
+fn take_reader<R: serial::Read<u8>>(_r: &R) {
+    // do nothing, but things should typecheck
+}
+
+fn take_writer<W: serial::Write<u8>>(_w: &W) {
+    // do nothing, but things should typecheck
+}
+
+fn main() {
+    let port = serialport::new("/dev/null", 9600)
+        .open()
+        .expect("This example isn't meant for running. It just demonstrates compatibility with embedded-hal on a type level.");
+    take_reader(&port);
+    take_writer(&port);
+}