v0.4.0

closes #32
closes #33

tests/cpass/schedule.rs

@@ -0,0 +1,59 @@
+#![feature(extern_crate_item_prelude)] // ???
+#![no_main]
+#![no_std]
+
+extern crate lm3s6965;
+extern crate panic_halt;
+extern crate rtfm;
+
+use rtfm::{app, Instant};
+
+#[app(device = lm3s6965)]
+const APP: () = {
+    #[init(schedule = [foo, bar, baz])]
+    fn init() {
+        let _: Result<(), ()> = schedule.foo(start + 10.cycles());
+        let _: Result<(), u32> = schedule.bar(start + 20.cycles(), 0);
+        let _: Result<(), (u32, u32)> = schedule.baz(start + 30.cycles(), 0, 1);
+    }
+
+    #[idle(schedule = [foo, bar, baz])]
+    fn idle() -> ! {
+        let _: Result<(), ()> = schedule.foo(Instant::now() + 40.cycles());
+        let _: Result<(), u32> = schedule.bar(Instant::now() + 50.cycles(), 0);
+        let _: Result<(), (u32, u32)> = schedule.baz(Instant::now() + 60.cycles(), 0, 1);
+
+        loop {}
+    }
+
+    #[exception(schedule = [foo, bar, baz])]
+    fn SVCall() {
+        let _: Result<(), ()> = schedule.foo(start + 70.cycles());
+        let _: Result<(), u32> = schedule.bar(start + 80.cycles(), 0);
+        let _: Result<(), (u32, u32)> = schedule.baz(start + 90.cycles(), 0, 1);
+    }
+
+    #[interrupt(schedule = [foo, bar, baz])]
+    fn UART0() {
+        let _: Result<(), ()> = schedule.foo(start + 100.cycles());
+        let _: Result<(), u32> = schedule.bar(start + 110.cycles(), 0);
+        let _: Result<(), (u32, u32)> = schedule.baz(start + 120.cycles(), 0, 1);
+    }
+
+    #[task(schedule = [foo, bar, baz])]
+    fn foo() {
+        let _: Result<(), ()> = schedule.foo(scheduled + 130.cycles());
+        let _: Result<(), u32> = schedule.bar(scheduled + 140.cycles(), 0);
+        let _: Result<(), (u32, u32)> = schedule.baz(scheduled + 150.cycles(), 0, 1);
+    }
+
+    #[task]
+    fn bar(_x: u32) {}
+
+    #[task]
+    fn baz(_x: u32, _y: u32) {}
+
+    extern "C" {
+        fn UART1();
+    }
+};