add binds example and make it work

examples/binds.rs

@@ -0,0 +1,48 @@
+//! examples/binds.rs
+
+#![deny(unsafe_code)]
+#![deny(warnings)]
+#![no_main]
+#![no_std]
+
+extern crate panic_semihosting;
+
+use cortex_m_semihosting::{debug, hprintln};
+use lm3s6965::Interrupt;
+use rtfm::app;
+
+// `examples/interrupt.rs` rewritten to use `binds`
+#[app(device = lm3s6965)]
+const APP: () = {
+    #[init]
+    fn init() {
+        rtfm::pend(Interrupt::UART0);
+
+        hprintln!("init").unwrap();
+    }
+
+    #[idle]
+    fn idle() -> ! {
+        hprintln!("idle").unwrap();
+
+        rtfm::pend(Interrupt::UART0);
+
+        debug::exit(debug::EXIT_SUCCESS);
+
+        loop {}
+    }
+
+    #[interrupt(binds = UART0)]
+    fn foo() {
+        static mut TIMES: u32 = 0;
+
+        *TIMES += 1;
+
+        hprintln!(
+            "foo called {} time{}",
+            *TIMES,
+            if *TIMES > 1 { "s" } else { "" }
+        )
+        .unwrap();
+    }
+};