rtc_wakeup_example.c File Reference

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Detailed Description

RTC wake-up example application for AVR32 UC3.

• Compiler: IAR EWAVR32 and GNU GCC for AVR32
• Supported devices: All AVR32 devices with a RTC.
• AppNote:

Author:

Atmel Corporation: http://www.atmel.com
Support and FAQ: http://support.atmel.no/

Definition in file rtc_wakeup_example.c.

#include <avr32/io.h>
#include "board.h"
#include "pm.h"
#include "gpio.h"
#include "rtc.h"

Include dependency graph for rtc_wakeup_example.c:

Go to the source code of this file.

Sleep time
Time in seconds the application shall sleep. The RTC wakes the application after this time. Introduction This example demonstrates how to the RTC can be used to wake-up a sleeping application. Operating mode: Press button 0 to enter Idle sleep mode. Press button 1 to enter Frozen sleep mode. Press button 2 to enter Standby sleep mode. The red led on the board will light up when the system is in a sleep mode. The RTC will wake-up the application after a specified time. This time may be adjusted by the user in the source file and is by default 3 seconds. Main Files rtc.c: real time counter driver; rtc.h: real time counter driver header file; rtc_example.c: real time counter example application. Compilation Information This software is written for GNU GCC for AVR32 and for IAR Embedded Workbench for Atmel AVR32. Other compilers may or may not work. Device Information All AVR32 devices with an RTC and GPIO controller. Configuration Information This example has been tested with the following configuration: EVK1100 evaluation kit; CPU clock: Internal RC oscillator; Contact Information For further information, visit Atmel AVR32. Support and FAQ: http://support.atmel.no/
#define	SLEEP_TIME   3
int	main (void)
	main function : init RTC, wait until a button is pressed to go to sleep. The RTC wakes up the application.

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Define Documentation

#define SLEEP_TIME   3

Definition at line 89 of file rtc_wakeup_example.c.

Referenced by main().

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Function Documentation

int main

(

void

)

main function : init RTC, wait until a button is pressed to go to sleep. The RTC wakes up the application.

Definition at line 95 of file rtc_wakeup_example.c.

References gpio_clr_gpio_pin(), gpio_get_pin_value(), GPIO_PUSH_BUTTON_0, GPIO_PUSH_BUTTON_1, GPIO_PUSH_BUTTON_2, gpio_set_gpio_pin(), LED0_GPIO, LED4_GPIO, rtc_disable_wake_up(), rtc_enable(), rtc_enable_wake_up(), rtc_get_value(), rtc_init(), RTC_OSC_32KHZ, RTC_PSEL_32KHZ_1HZ, rtc_set_top_value(), SLEEP, and SLEEP_TIME.

               {
        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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