1 files changed, 75 insertions, 0 deletions
diff --git a/examples/two-tasks.rs b/examples/two-tasks.rs
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+++ b/examples/two-tasks.rs
@@ -0,0 +1,75 @@
+//! Two tasks running at the same priority with access to the same resource
+
+#![deny(unsafe_code)]
+#![feature(const_fn)]
+#![feature(proc_macro)]
+#![no_std]
+
+#[macro_use(task)]
+extern crate cortex_m_rtfm as rtfm;
+extern crate stm32f103xx;
+
+use rtfm::{app, Threshold};
+
+app! {
+    device: stm32f103xx,
+
+    // Resources that are plain data, not peripherals
+    resources: {
+        // Declaration of resources looks like the declaration of `static`
+        // variables
+        static COUNTER: u64 = 0;
+    },
+
+    tasks: {
+        SYS_TICK: {
+            priority: 1,
+            // Both this task and TIM2 have access to the `COUNTER` resource
+            resources: [COUNTER],
+        },
+
+        // An interrupt as a task
+        TIM2: {
+            // For interrupts the `enabled` field must be specified. It
+            // indicates if the interrupt will be enabled or disabled once
+            // `idle` starts
+            enabled: true,
+            priority: 1,
+            resources: [COUNTER],
+        },
+    },
+}
+
+// when data resources are declared in the top `resources` field, `init` will
+// have full access to them
+fn init(_p: init::Peripherals, _r: init::Resources) {
+    // ..
+}
+
+fn idle() -> ! {
+    loop {
+        rtfm::wfi();
+    }
+}
+
+task!(SYS_TICK, sys_tick);
+
+// As both tasks are running at the same priority one can't preempt the other.
+// Thus both tasks have direct access to the resource
+fn sys_tick(_t: &mut Threshold, r: SYS_TICK::Resources) {
+    // ..
+
+    **r.COUNTER += 1;
+
+    // ..
+}
+
+task!(TIM2, tim2);
+
+fn tim2(_t: &mut Threshold, r: TIM2::Resources) {
+    // ..
+
+    **r.COUNTER += 1;
+
+    // ..
+}