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libraries/Adafruit_SleepyDog_Library/examples/BasicUsage/BasicUsage.ino

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+// Adafruit Watchdog Library Basic Usage Example
+//
+// Simple example of how to use the watchdog library.
+//
+// Author: Tony DiCola
+
+#ifdef USE_TINYUSB
+#include <Adafruit_TinyUSB.h>  // Include TinyUSB Serial port
+#endif
+
+#include <Adafruit_SleepyDog.h>
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial)
+    delay(10);
+  // wait for Arduino Serial Monitor (native USB boards)
+
+  Serial.println("Adafruit Watchdog Library Demo!");
+  Serial.println();
+
+  // First a normal example of using the watchdog timer.
+  // Enable the watchdog by calling Watchdog.enable() as below.
+  // This will turn on the watchdog timer with a ~4 second timeout
+  // before reseting the Arduino. The estimated actual milliseconds
+  // before reset (in milliseconds) is returned.
+  // Make sure to reset the watchdog before the countdown expires or
+  // the Arduino will reset!
+  int countdownMS = Watchdog.enable(4000);
+  Serial.print("Enabled the watchdog with max countdown of ");
+  Serial.print(countdownMS, DEC);
+  Serial.println(" milliseconds!");
+  Serial.println();
+
+  // Now loop a few times and periodically reset the watchdog.
+  Serial.println("Looping ten times while resetting the watchdog...");
+  for (int i = 1; i <= 10; ++i) {
+    Serial.print("Loop #");
+    Serial.println(i, DEC);
+    delay(1000);
+    // Reset watchdog with every loop to make sure the sketch keeps running.
+    // If you comment out this call watch what happens in about 4 iterations!
+    Watchdog.reset();
+  }
+  Serial.println();
+
+// can not disable NRF or RP2040 wdt once enabled
+#if !defined(NRF52_SERIES) && !defined(ARDUINO_ARCH_RP2040)
+  // Disable the watchdog entirely by calling Watchdog.disable();
+  Watchdog.disable();
+#endif
+
+  // Finally demonstrate the watchdog resetting by enabling it for a shorter
+  // period of time and waiting a long time without a reset.  Notice you can
+  // pass a _maximum_ countdown time (in milliseconds) to the enable call.
+  // The library will try to use that value as the countdown, but it might
+  // pick a smaller value if the hardware doesn't support it.  The actual
+  // countdown value will be returned so you can see what it is.
+  countdownMS = Watchdog.enable(4000);
+  Serial.print("Get ready, the watchdog will reset in ");
+  Serial.print(countdownMS, DEC);
+  Serial.println(" milliseconds!");
+  Serial.println();
+#ifndef ARDUINO_ARCH_ESP8266
+  delay(countdownMS + 1000);
+#else
+  // Calls to delay() and yield() feed the ESP8266's
+  // hardware and software watchdog timers, delayMicroseconds does not.
+  delayMicroseconds(countdownMS * 1000);
+#endif
+
+  // Execution will never get here because the watchdog resets the Arduino!
+}
+
+void loop() {
+  // We'll never actually get to the loop because the watchdog will reset in
+  // the setup function.
+  Serial.println("You shouldn't see this message.");
+  delay(1000);
+}