PowerSave.cpp

/*
 * Copyright (C) 2012 Southern Storm Software, Pty Ltd.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include "PowerSave.h"
#include <avr/wdt.h>
#include <avr/sleep.h>
#include <avr/power.h>
#include <avr/interrupt.h>

/*\@{*/

ISR(WDT_vect)
{
    wdt_disable();
}
void sleepFor(SleepDuration duration, uint8_t mode)
{
    // Turn off the analog to digital converter.
    ADCSRA &= ~(1 << ADEN);
    power_adc_disable();

    // Turn on the watchdog timer for the desired duration.
    wdt_enable(duration);
    WDTCSR |= (1 << WDIE);

    // Put the device to sleep, including turning off the Brown Out Detector.
    set_sleep_mode(mode);
    cli();
    sleep_enable();
#if defined(sleep_bod_disable)
    sleep_bod_disable();
#endif
    sei();
    sleep_cpu();
    sleep_disable();
    sei();

    // Turn the analog to digital converter back on.
    power_adc_enable();
    ADCSRA |= (1 << ADEN);
}

/*\@}*/