Merge #97

97: v0.4.0 r=japaric a=japaric

closes #32
closes #33

Co-authored-by: Jorge Aparicio <jorge@japaric.io>

1 files changed, 61 insertions, 0 deletions

diff --git a/examples/message.rs b/examples/message.rs
new file mode 100644
index 0000000..1ff08b2
--- /dev/null
+++ b/examples/message.rs
@@ -0,0 +1,61 @@
+//! examples/message.rs
+
+#![deny(unsafe_code)]
+#![deny(warnings)]
+#![no_main]
+#![no_std]
+
+extern crate panic_semihosting;
+
+use cortex_m_semihosting::debug;
+use rtfm::app;
+
+macro_rules! println {
+    ($($tt:tt)*) => {
+        if let Ok(mut stdout) = cortex_m_semihosting::hio::hstdout() {
+            use core::fmt::Write;
+
+            writeln!(stdout, $($tt)*).ok();
+        }
+    };
+}
+
+#[app(device = lm3s6965)]
+const APP: () = {
+    #[init(spawn = [foo])]
+    fn init() {
+        spawn.foo(/* no message */).unwrap();
+    }
+
+    #[task(spawn = [bar])]
+    fn foo() {
+        static mut COUNT: u32 = 0;
+
+        println!("foo");
+
+        spawn.bar(*COUNT).unwrap();
+        *COUNT += 1;
+    }
+
+    #[task(spawn = [baz])]
+    fn bar(x: u32) {
+        println!("bar({})", x);
+
+        spawn.baz(x + 1, x + 2).unwrap();
+    }
+
+    #[task(spawn = [foo])]
+    fn baz(x: u32, y: u32) {
+        println!("baz({}, {})", x, y);
+
+        if x + y > 4 {
+            debug::exit(debug::EXIT_SUCCESS);
+        }
+
+        spawn.foo().unwrap();
+    }
+
+    extern "C" {
+        fn UART0();
+    }
+};