Merge pull request #382 from fnafnio/typestate_nrf_timer

Typestate nrf timer

examples/nrf/src/bin/awaitable_timer.rs

@@ -0,0 +1,29 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+#![allow(incomplete_features)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use embassy_nrf::interrupt;
+use embassy_nrf::timer::Timer;
+use embassy_nrf::Peripherals;
+use example_common::info;
+
+use embassy::executor::Spawner;
+
+#[embassy::main]
+async fn main(_spawner: Spawner, p: Peripherals) {
+    let mut t = Timer::new_awaitable(p.TIMER0, interrupt::take!(TIMER0));
+    // default frequency is 1MHz, so this triggers every second
+    t.cc(0).write(1_000_000);
+    // clear the timer value on cc[0] compare match
+    t.cc(0).short_compare_clear();
+    t.start();
+
+    loop {
+        // wait for compare match
+        t.cc(0).wait().await;
+        info!("hardware timer tick");
+    }
+}