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Sleep_Timer/Sleep_Timer.ino

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+/*
+ * Sketch for testing sleep mode with wake up on timer.
+ * Donal Morrissey - 2011.
+ *
+ */
+#include <avr/sleep.h>
+#include <avr/power.h>
+
+#define LED_PIN (13)
+
+volatile int f_timer=0;
+volatile int f_blc=0;
+
+
+/***************************************************
+ *  Name:        ISR(TIMER1_OVF_vect)
+ *
+ *  Returns:     Nothing.
+ *
+ *  Parameters:  None.
+ *
+ *  Description: Timer1 Overflow interrupt.
+ *
+ ***************************************************/
+ISR(TIMER1_OVF_vect)
+{
+  f_blc++;
+  /* set the flag. */
+   if(f_timer == 0 & f_blc >= 11)
+   {
+     f_timer = 1;
+     f_blc = 0;
+   }
+}
+
+
+/***************************************************
+ *  Name:        enterSleep
+ *
+ *  Returns:     Nothing.
+ *
+ *  Parameters:  None.
+ *
+ *  Description: Enters the arduino into sleep mode.
+ *
+ ***************************************************/
+void enterSleep(void)
+{
+  set_sleep_mode(SLEEP_MODE_IDLE);
+  
+  sleep_enable();
+
+
+  /* Disable all of the unused peripherals. This will reduce power
+   * consumption further and, more importantly, some of these
+   * peripherals may generate interrupts that will wake our Arduino from
+   * sleep!
+   */
+  power_adc_disable();
+  power_spi_disable();
+  power_timer0_disable();
+  power_timer2_disable();
+  power_twi_disable();  
+
+  /* Now enter sleep mode. */
+  sleep_mode();
+  
+  /* The program will continue from here after the timer timeout*/
+  sleep_disable(); /* First thing to do is disable sleep. */
+  
+  /* Re-enable the peripherals. */
+  power_all_enable();
+                // wait for a second
+}
+
+
+
+/***************************************************
+ *  Name:        setup
+ *
+ *  Returns:     Nothing.
+ *
+ *  Parameters:  None.
+ *
+ *  Description: Setup for the serial comms and the
+ *                timer. 
+ *
+ ***************************************************/
+void setup()
+{
+  Serial.begin(9600);
+  
+  /* Don't forget to configure the pin! */
+  pinMode(LED_PIN, OUTPUT);
+
+  /*** Configure the timer.***/
+  
+  /* Normal timer operation.*/
+  TCCR1A = 0x00; 
+  
+  /* Clear the timer counter register.
+   * You can pre-load this register with a value in order to 
+   * reduce the timeout period, say if you wanted to wake up
+   * ever 4.0 seconds exactly.
+   */
+  TCNT1=0x0000; 
+  
+  /* Configure the prescaler for 1:1024, giving us a 
+   * timeout of 4.09 seconds.
+   */
+  TCCR1B = 0x05;
+  
+  /* Enable the timer overlow interrupt. */
+  TIMSK1=0x01;
+}
+
+
+
+/***************************************************
+ *  Name:        enterSleep
+ *
+ *  Returns:     Nothing.
+ *
+ *  Parameters:  None.
+ *
+ *  Description: Main application loop.
+ *
+ ***************************************************/
+void loop()
+{
+  if(f_timer==1)
+  {
+    f_timer = 0;
+    /* Toggle the LED */
+    digitalWrite(LED_PIN, HIGH);
+    delay(100);
+    digitalWrite(LED_PIN, LOW);
+    
+    /* Re-enter sleep mode. */
+    enterSleep();
+  }
+}