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digistump-sam/libraries/RF24Network/examples/sensornet/sleep.h

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+
+/*
+ Copyright (C) 2011 James Coliz, Jr. <maniacbug@ymail.com>
+ 
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License
+ version 2 as published by the Free Software Foundation.
+ */
+
+/**
+ * @file sleep.h 
+ *
+ * Declaration of the sleep_c class. 
+ */
+ 
+#ifndef __SLEEP_H__
+#define __SLEEP_H__
+
+/**
+ * Enums for the duration of the watchdog timer
+ */
+
+typedef enum { wdt_16ms = 0, wdt_32ms, wdt_64ms, wdt_128ms, wdt_250ms, wdt_500ms, wdt_1s, wdt_2s, wdt_4s, wdt_8s } wdt_prescalar_e;
+
+/**
+ * Simplified sleeping handler
+ */
+
+class sleep_c
+{
+public:
+  /**
+   * Enable the system to be able to sleep
+   *
+   * Does not actually do any sleeping.
+   *
+   * For example, to do something roughly evert minute, configure
+   * it like this:
+   * 
+   * @code
+   *  Sleep.begin(wdt_8s,7);
+   * @endcode
+   *
+   * @param prescalar Duration of the watchdog timer interrupt.
+   * The system will actually sleep for this long.
+   * @param cycles Number of times the system will wake up before
+   * returning from @p go().
+   */
+  void begin(wdt_prescalar_e prescalar,short cycles);
+
+  /**
+   * Go to sleep 
+   *
+   * This will return after the watchdog has awoken for the number
+   * of times specified in begin().
+   */
+  void go(void);
+
+  /**
+   * Test whether the node sleeps
+   *
+   * @retval true if the node will sleep
+   */
+  operator bool(void) const 
+  {
+    return sleep_cycles_per_transmission;
+  }
+
+private:
+  volatile short sleep_cycles_remaining;
+  short sleep_cycles_per_transmission; 
+};
+
+/**
+ * Singleton instance for general use
+ *
+ * @warning: This class is hard-coded to ONLY work with this singleton.
+ * Any other instances will fail.
+ */
+
+extern sleep_c Sleep;
+
+#endif // __SLEEP_H__
+// vim:ai:cin:sts=2 sw=2 ft=cpp