rtc_wakeup_example.c

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/* Copyright (c) 2007, Atmel Corporation All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. The name of ATMEL may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY ATMEL ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND
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#include <avr32/io.h>
#include "board.h"
#include "pm.h"
#include "gpio.h"
#include "rtc.h"

#define SLEEP_TIME      3

int main(void) {
        int sleep_mode;
        
        gpio_clr_gpio_pin(LED0_GPIO);
        
        // Initialize the RTC
        if (!rtc_init(&AVR32_RTC, RTC_OSC_32KHZ, RTC_PSEL_32KHZ_1HZ))
        {
                while(1);
        }
        // Enable the RTC
        rtc_enable(&AVR32_RTC);

        while(1){
                
                // clear LED to indicate wake-up
                gpio_set_gpio_pin(LED4_GPIO);
                
                // wait until button is pressed
                while(1) {
                                if(gpio_get_pin_value(GPIO_PUSH_BUTTON_0) == 0) {
                                        sleep_mode = AVR32_PM_SMODE_IDLE;
                                        break;
                                }
                                if(gpio_get_pin_value(GPIO_PUSH_BUTTON_1) == 0){
                                        sleep_mode = AVR32_PM_SMODE_FROZEN;
                                        break;
                                }
                                if(gpio_get_pin_value(GPIO_PUSH_BUTTON_2) == 0){
                                        sleep_mode = AVR32_PM_SMODE_STANDBY;
                                        break;
                                }
                }
                // set new wake-up time for the RTC
                rtc_set_top_value(&AVR32_RTC, SLEEP_TIME + rtc_get_value(&AVR32_RTC));
                
                // RTC wake-up must be disabled and activated again to enable 
                // the wake-up feature
                rtc_disable_wake_up(&AVR32_RTC);
                rtc_enable_wake_up(&AVR32_RTC);
                
                // set LED to indicate sleep
                gpio_clr_gpio_pin(LED4_GPIO);
                
                // enter sleep mode
                switch(sleep_mode) {
                case AVR32_PM_SMODE_IDLE: 
                        SLEEP(AVR32_PM_SMODE_IDLE);
                        break;
                case AVR32_PM_SMODE_FROZEN:
                        SLEEP(AVR32_PM_SMODE_FROZEN);
                        break;
                case AVR32_PM_SMODE_STANDBY:
                        SLEEP(AVR32_PM_SMODE_STANDBY);
                        break;
                default:
                        break;
                }

                
        }
        
        return 0;
}

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