samd51,rp2040,nrf528xx,stm32: implement watchdog

src/examples/watchdog/main.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"fmt"
+	"machine"
+	"time"
+)
+
+func main() {
+	//sleep for 2 secs for console
+	time.Sleep(2 * time.Second)
+
+	config := machine.WatchdogConfig{
+		TimeoutMillis: 1000,
+	}
+
+	println("configuring watchdog for max 1 second updates")
+	machine.Watchdog.Configure(config)
+
+	// From this point the watchdog is running and Update must be
+	// called periodically, per the config
+	machine.Watchdog.Start()
+
+	// This loop should complete because watchdog update is called
+	// every 100ms.
+	start := time.Now()
+	println("updating watchdog for 3 seconds")
+	for i := 0; i < 30; i++ {
+		time.Sleep(100 * time.Millisecond)
+		machine.Watchdog.Update()
+		fmt.Printf("alive @ %v\n", time.Now().Sub(start))
+	}
+
+	// This loop should cause a watchdog reset after 1s since
+	// there is no update call.
+	start = time.Now()
+	println("entering tight loop")
+	for {
+		time.Sleep(100 * time.Millisecond)
+		fmt.Printf("alive @ %v\n", time.Now().Sub(start))
+	}
+}