nrf: add WDT driver

examples/nrf/src/bin/wdt.rs

@@ -0,0 +1,46 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+#![allow(incomplete_features)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+
+use defmt::*;
+use embassy::executor::Spawner;
+use embassy_nrf::gpio::{Input, Pull};
+use embassy_nrf::gpiote::PortInput;
+use embassy_nrf::wdt::{Config, Watchdog};
+use embassy_nrf::Peripherals;
+use embassy_traits::gpio::{WaitForHigh, WaitForLow};
+
+#[embassy::main]
+async fn main(_spawner: Spawner, p: Peripherals) {
+    info!("Hello World!");
+
+    let mut config = Config::default();
+    config.timeout_ticks = 32768 * 3; // 3 seconds
+
+    // This is needed for `probe-run` to be able to catch the panic message
+    // in the WDT interrupt. The core resets 2 ticks after firing the interrupt.
+    config.run_during_debug_halt = false;
+
+    let (_wdt, [mut handle]) = match Watchdog::try_new::<1>(p.WDT, config) {
+        Ok(x) => x,
+        Err(_) => {
+            info!("Watchdog already active with wrong config, waiting for it to timeout...");
+            loop {}
+        }
+    };
+
+    let mut button = PortInput::new(Input::new(p.P0_11, Pull::Up));
+
+    info!("Watchdog started, press button 1 to pet it or I'll reset in 3 seconds!");
+
+    loop {
+        button.wait_for_high().await;
+        button.wait_for_low().await;
+        info!("Button pressed, petting watchdog!");
+        handle.pet();
+    }
+}