Add example for using a Signal.

examples/stm32h7/src/bin/signal.rs

@@ -0,0 +1,41 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+// global logger
+use defmt::{info, unwrap};
+use defmt_rtt as _;
+
+use panic_probe as _;
+
+use embassy::channel::Signal;
+use embassy::executor::Spawner;
+use embassy::time::{Duration, Timer};
+
+use embassy_stm32::Peripherals;
+
+static SIGNAL: Signal<u32> = Signal::new();
+
+#[embassy::task]
+async fn my_sending_task() {
+    let mut counter: u32 = 0;
+
+    loop {
+        Timer::after(Duration::from_secs(1)).await;
+
+        SIGNAL.signal(counter);
+
+        counter = counter.wrapping_add(1);
+    }
+}
+
+#[embassy::main]
+async fn main(spawner: Spawner, _p: Peripherals) {
+    unwrap!(spawner.spawn(my_sending_task()));
+
+    loop {
+        let received_counter = SIGNAL.wait().await;
+
+        info!("signalled, counter: {}", received_counter);
+    }
+}