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, 65 insertions, 0 deletions

diff --git a/examples/late.rs b/examples/late.rs
new file mode 100644
index 0000000..6d76c58
--- /dev/null
+++ b/examples/late.rs
@@ -0,0 +1,65 @@
+//! examples/late.rs
+
+#![deny(unsafe_code)]
+#![deny(warnings)]
+#![no_main]
+#![no_std]
+
+extern crate panic_semihosting;
+
+use cortex_m_semihosting::debug;
+use heapless::{
+    consts::*,
+    spsc::{Consumer, Producer, Queue},
+};
+use lm3s6965::Interrupt;
+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: () = {
+    // Late resources
+    static mut P: Producer<'static, u32, U4> = ();
+    static mut C: Consumer<'static, u32, U4> = ();
+
+    #[init]
+    fn init() {
+        // NOTE: we use `Option` here to work around the lack of
+        // a stable `const` constructor
+        static mut Q: Option<Queue<u32, U4>> = None;
+
+        *Q = Some(Queue::new());
+        let (p, c) = Q.as_mut().unwrap().split();
+
+        // Initialization of late resources
+        P = p;
+        C = c;
+    }
+
+    #[idle(resources = [C])]
+    fn idle() -> ! {
+        loop {
+            if let Some(byte) = resources.C.dequeue() {
+                println!("received message: {}", byte);
+
+                debug::exit(debug::EXIT_SUCCESS);
+            } else {
+                rtfm::pend(Interrupt::UART0);
+            }
+        }
+    }
+
+    #[interrupt(resources = [P])]
+    fn UART0() {
+        resources.P.enqueue(42).unwrap();
+    }
+};