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libraries/Adafruit_SleepyDog_Library/examples/SleepRP2350Timer/SleepRP2350Timer.ino

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+// Adafruit Watchdog Library - RP2350 Timer Sleep Example
+//
+// Simple example for using the Adafruit Watchdog Library to put the RP2350 to
+// sleep until the AON timer expires. NOTE: This example exposes both the Sleep
+// State (6.5.2 in RP2350 Datasheet) and the Dormant State (6.5.3 in RP2350
+// Datasheet) APIs.
+//
+// Brent Rubell for Adafruit Industries
+//
+// NOTE: After uploading, physically unplug and replug the USB cable to
+// reset the AON timer correctly before running.
+
+#include <Adafruit_SleepyDog.h>
+#ifdef USE_TINYUSB
+#include <Adafruit_TinyUSB.h>
+#else
+#include "USB.h"
+#endif
+
+static bool awake;
+
+// This function will be called when the device wakes from sleep
+// You can add any custom behavior you want here
+void cbWake() {
+  // Show we're awake again
+  digitalWrite(LED_BUILTIN, HIGH);
+  awake = true;
+}
+
+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);
+  digitalWrite(LED_BUILTIN, HIGH);
+
+  Serial.begin(115200);
+  // while(!Serial);
+  Serial.println("Adafruit Watchdog Library - RP2350 Sleep Timer Demo!");
+  Serial.println();
+
+  // When the device wakes back up, we'll call this callback function
+  // to indicate that we've resumed from sleep.
+  Watchdog.setWakeCb(cbWake);
+}
+
+void loop() {
+  Serial.println("Going to sleep in 5 seconds...");
+  delay(5000);
+
+  // Enter Sleep mode for 5 seconds
+  awake = false;
+  digitalWrite(LED_BUILTIN, LOW);
+  // Enter sleep state (6.5.2 in RP2350 Datasheet)
+  Watchdog.goToSleepUntil(5000);
+  // Uncomment the line below (and comment the line above) to enter Dormant
+  // State (6.5.3 in RP2350 Datasheet) instead of the Sleep State above
+  // Watchdog.goToSleepUntil(5000, true);
+
+  // Make sure we don't wake
+  while (!awake) {
+    Serial.println("Should be sleeping here...");
+  }
+
+  // Re-enable clocks, generators, USB and resume execution
+  // NOTE: This MUST be called to properly resume from sleep!
+  Watchdog.resumeFromSleep();
+        #ifndef USE_TINYUSB
+      // Re-enable USB after sleep. Required for Windows where USB
+    // does not re-enumerate automatically. On macOS and Linux, USB is
+    // maintained across sleep cycles. If you use an external serial terminal
+    // (e.g. screen, minicom), comment out USB.disconnect() and USB.connect()
+    // to prevent the port from disconnecting on each wake cycle.
+    USB.disconnect();
+      delay(500); // Give host time to register disconnect before reconnecting
+    USB.connect();
+  #endif
+
+  Serial.println("I'm awake now!");
+  Serial.print("Slept for approximately ");
+  long sleep_duration = Watchdog.getSleepDuration();
+  Serial.print(sleep_duration);
+  Serial.println(" milliseconds.");
+}