70 lines
2.4 KiB
Arduino
70 lines
2.4 KiB
Arduino
// Adafruit Watchdog Library - RP2350 Pin/GPIO Sleep Example
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//
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// Simple example for using the Adafruit Watchdog Library to put the RP2350 to
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// sleep until a GPIO pin changes state.
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//
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// Brent Rubell for Adafruit Industries
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//
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// NOTE: After uploading, physically unplug and replug the USB cable to
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// reset the AON timer correctly before running.
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#include <Adafruit_SleepyDog.h>
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#ifdef USE_TINYUSB
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#include <Adafruit_TinyUSB.h>
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#else
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#include "USB.h"
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#endif
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#define WAKE_PIN 2 // GPIO pin to wake on, change as needed for your use case
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void setup() {
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pinMode(LED_BUILTIN, OUTPUT);
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digitalWrite(LED_BUILTIN, HIGH);
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Serial.begin(115200);
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// while (!Serial);
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Serial.println("Adafruit Watchdog Library - RP2350 Sleep Pin/GPIO Demo!");
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Serial.println();
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}
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void loop() {
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Serial.println("Going to sleep in 5 seconds...");
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Serial.println("To wake up, connect GPIO pin 2 to 3.3V (for HIGH wake).");
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delay(5000);
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// Enter Sleep mode for 5 seconds
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digitalWrite(LED_BUILTIN, LOW);
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// Sleep until GPIO WAKE_PIN goes HIGH on a rising edge
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Watchdog.goToSleepUntilPin(WAKE_PIN, true, true);
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// Sleep until GPIO WAKE_PIN goes HIGH on a falling edge
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// Watchdog.goToSleepUntilPin(WAKE_PIN, false, true);
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// Sleep until GPIO WAKE_PIN goes LOW on a rising edge
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// Watchdog.goToSleepUntilPin(WAKE_PIN, true, false);
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// Sleep until GPIO WAKE_PIN goes LOW on a falling edge
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// Watchdog.goToSleepUntilPin(WAKE_PIN, false, false);
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// Re-enable clocks, generators, USB and resume execution
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// NOTE: This MUST be called to properly resume from sleep!
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Watchdog.resumeFromSleep();
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#ifndef USE_TINYUSB
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// Re-enable USB after sleep. Required for Windows where USB
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// does not re-enumerate automatically. On macOS and Linux, USB is
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// maintained across sleep cycles. If you use an external serial terminal
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// (e.g. screen, minicom), comment out USB.disconnect() and USB.connect()
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// to prevent the port from disconnecting on each wake cycle.
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USB.disconnect();
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delay(500); // Give host time to register disconnect before reconnecting
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USB.connect();
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#endif
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// NOTE: We can not track sleep duration when waking from a pin because we use
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// the crystal oscillator as the dormant clock source, so the AON timer we'd
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// use to track sleep duration is turned off. If you need to track sleep
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// duration, see the SleepRP2350Timer example which uses the AON timer to wake
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// from sleep.
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Serial.println("I'm awake now!");
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}
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