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libraries/Adafruit_SleepyDog_Library/utility/WatchdogAVR.h

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+#ifndef WATCHDOGAVR_H
+#define WATCHDOGAVR_H
+
+class WatchdogAVR {
+public:
+  WatchdogAVR() : _wdto(-1) {}
+
+  // Enable the watchdog timer to reset the machine after a period of time
+  // without any calls to reset().  The passed in period (in milliseconds) is
+  // just a suggestion and a lower value might be picked if the hardware does
+  // not support the exact desired value.
+  //
+  // The actual period (in milliseconds) before a watchdog timer reset is
+  // returned.
+  int enable(int maxPeriodMS = 0);
+
+  // Reset or 'kick' the watchdog timer to prevent a reset of the device.
+  void reset();
+
+  // Completely disable the watchdog timer.
+  void disable();
+
+  // Enter the lowest power sleep mode (using the watchdog timer) for the
+  // desired period of time.  The passed in period (in milliseconds) is
+  // just a suggestion and a lower value might be picked if the hardware does
+  // not support the exact desired value
+  //
+  // The actual period (in milliseconds) that the hardware was asleep will be
+  // returned.
+  int sleep(int maxPeriodMS = 0);
+
+private:
+  // Pick the closest (but not higher) watchdog timer value from the provided
+  // maximum period.  Sets wdto to the chosen period value suitable for
+  // passing to wdt_enable(), and actualMS to the chosen period value in
+  // milliseconds.  A max value of 0 will pick the longest value possible.
+  void _setPeriod(int maxMS, int &wdto, int &actualMS);
+
+  // Keep the last selected watchdog timer period so that the watchdog can be
+  // re-enabled at that rate after sleep.  A value of -1 means no watchdog
+  // timer was enabled.
+  int _wdto;
+};
+
+#endif