main.c

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/* This file has been prepared for Doxygen automatic documentation generation.*/
/*============================ INCLUDES ======================================*/
#include <stdint.h>
#include <stdbool.h>

#include <avr/io.h>
#include <avr/sleep.h>
#include <avr/interrupt.h>
#include <avr/wdt.h>
#include <util/delay.h>


/*============================ MACROS ========================================*/
/* GPIO define*/
#ifndef F_CPU
# define F_CPU 1000000UL
#endif 

/*============================ GLOBAL VARIABLES ==============================*/
uint8_t gState = 0;
volatile bool run = false;

/*============================ IMPLEMENTATION ================================*/
void LOWPOWER_Init(void)
{
    wdt_disable();
    sleep_bod_disable();

    PRR = (1 << PRTWI) | (1 << PRTIM2 ) | (1 << PRTIM1 ) | \
          (1 << PRTIM0 ) | (1 << PRSPI ) | (1 << PRUSART0 ) | (1 << PRADC ) ; 
  
    /* set pin input and pull up */
    DDRB = 0x00;
    PORTB = 0xFF;
    DDRC = 0x00;
    PORTC = 0xFF;
    DDRD = 0x00;
    PORTD = 0xFF;
    /* Disable digital input */
    DIDR1 = (1 << AIN1D) | (1 << AIN0D);
    DIDR0 = (1 << ADC5D) | (1 << ADC4D) | (1 << ADC3D) | (1 << ADC2D) | (1 << ADC1D) | (1 << ADC0D);
}
void RTC_Init(void)
{
    PRR &= ~(1 << PRTIM2 );
    ASSR |= (1 << AS2);
}
void Disable_RTC(void)
{
    ASSR &= ~(1<<AS2);
    PRR |= (1 << PRTIM2 );
}
void LED_Init(void)
{
    DDRC  |= (1 << PINC1) | (1 << PINC2) | (1 << PINC3) | (1 << PINC4); 
    PORTC |= (1 << PINC1) | (1 << PINC2) | (1 << PINC3) | (1 << PINC4);  
    _delay_ms( 500 ); 
    PORTC &= ~((1 << PINC1) | (1 << PINC2) | (1 << PINC3) | (1 << PINC4));  
}
void ASYNC_Init(void)
{
    EICRA = 0x0;
    EIMSK |= (1 << INT0);
}
int main(void)
{
    LOWPOWER_Init();
    ASYNC_Init();
    LED_Init();

    for(;;) {
        switch(gState) {
            case 0:
                DDRC  = (1 << PINC4);
                PORTC = (1 << PINC4);
                break;
            /* Idle */
            case 1:
                set_sleep_mode(SLEEP_MODE_IDLE); 
                DDRC  = (1 << PINC3);   
                PORTC = (1 << PINC3);
                break;
            /* Power-save */
            case 2:
                set_sleep_mode(SLEEP_MODE_PWR_SAVE);
                DDRC  = (1 << PINC2);
                PORTC = (1 << PINC2);
                RTC_Init();
                break;
            /* Power-down */
            case 3:
                set_sleep_mode(SLEEP_MODE_PWR_DOWN); 
                DDRC  = (1 << PINC1);
                PORTC = (1 << PINC1);
                break;
            /* Shouldn't go to here. Go to Idle.*/
            default:
                gState = 1;
                set_sleep_mode(SLEEP_MODE_IDLE); 
                DDRC  = (1 << PINC3);   
                PORTC = (1 << PINC3);
        }
        
        sei(); 
        _delay_ms( 250 );
        // Check if key
        while ( !(PIND & (1 << PIND2))){
        }
        run = false;

        PORTC &= ~((1 << PINC1) | (1 << PINC2) | (1 << PINC3) | (1 << PINC4));  //LED OFF
        DDRC = 0x0;//INPUT

        if (gState == 0) {
            while (!run ){
            }
        } else {
            cli();
            sleep_enable();
            sleep_bod_disable();
            sei();
            sleep_cpu();
            sleep_disable();
            cli();
            /* Wake up from Power-Save mode */
            if (gState == 2) {
                Disable_RTC();
            }
        } 
        gState++;
        if (gState > 3) gState =0;    
    }
}
ISR(INT0_vect)
{
    run = true;
}

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