XMEGA_power_consumption.c

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/* This file has been prepared for Doxygen automatic documentation generation.*/
/*============================ INCLUDES ======================================*/
#include "avr_compiler.h"
#include "lowpower.h"
#include "rtc_driver.h"
#include "clksys_driver.h"
#include <avr/sleep.h>

/*============================ MACROS ========================================*/
/* GPIO define*/
#define SWITCHPORT                PORTC
#define LEDPORT                   PORTD
#ifndef F_CPU
# define F_CPU 2000000UL
#endif

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

/*============================ IMPLEMENTATION ================================*/
void ASYNC_Init( void )
{
    /* Pin 2 is used as source for interrupt */
    SWITCHPORT.INT0MASK  = PIN2_bm;

    /* Input configuaratin as low level */
    SWITCHPORT.PIN2CTRL  =  PORT_ISC_LEVEL_gc | PORT_OPC_PULLUP_gc; 
      
    /* Enable low level interrupt */
    SWITCHPORT.INTCTRL   = PORT_INT0LVL_LO_gc;

    /* Enable low leverl interrutp excute */
    PMIC.CTRL |= PMIC_LOLVLEX_bm; 
}
void LED_Init( void )
{
    LEDPORT.DIR = PIN3_bm | PIN4_bm | PIN5_bm | PIN6_bm; 
    LEDPORT.OUT |= PIN3_bm | PIN4_bm | PIN5_bm | PIN6_bm;//on  
    delay_us( 500000 ); 
    LEDPORT.OUT &= ~(PIN3_bm | PIN4_bm | PIN5_bm | PIN6_bm);//off
}

void RTC_Init( void )
{
    /* Enable external 32 kHz XTAL oscillator in low-power mode for RTC */
    OSC.XOSCCTRL = OSC_XOSCSEL_32KHz_gc | OSC_X32KLPM_bm;
    OSC.CTRL |= OSC_XOSCEN_bm;

    /* Wait for oscillator to stabilize */
    do { } while (!( OSC.STATUS & OSC_XOSCRDY_bm ));
    
    /* Set the oscillator as clock source for RTC */
    CLK.RTCCTRL = CLK_RTCSRC_TOSC_gc | CLK_RTCEN_bm;

    /* Wait until RTC is ready */
    do { } while ( RTC_Busy() );
}
void Enable_RTC ( void )
{
    /* Clear bit for RTC in PRR (it is set by LOWPOWER_Init()).*/
    PR.PRGEN &= ~PR_RTC_bm;
}
void Disable_RTC( void )
{
    PR.PRGEN |= PR_RTC_bm;
}

int main(void)
{

    RTC_Init();
    LOWPOWER_Init();    
    ASYNC_Init();
    LED_Init();

    /* ATxmega32a4 A version bug, see Errata */
    CCP = 0xd8;
    NVM.CTRLB |= 0x06;

    for(;;) {
        switch(gState) {
            case 0:
                LEDPORT.OUT = (PIN6_bm);
                break;
            /* Idle */ 
            case 1:
                set_sleep_mode(SLEEP_MODE_IDLE); 
                LEDPORT.OUT = (PIN5_bm);
                break;
            /* Power-save */
            case 2:
                set_sleep_mode(SLEEP_MODE_PWR_SAVE); 
                LEDPORT.OUT = (PIN4_bm);
                Enable_RTC();
                break;
            /* Power-down */
            case 3:
                set_sleep_mode(SLEEP_MODE_PWR_DOWN);
                LEDPORT.OUT = (PIN3_bm);
                break;
            /* Shouldn't go to here. Go to Idle.*/
            default:
                set_sleep_mode(SLEEP_MODE_IDLE); 
                LEDPORT.OUT = (PIN5_bm);
    }
    sei(); 

    delay_us( 250000 );

    LEDPORT.OUT &= ~(PIN3_bm | PIN4_bm | PIN5_bm | PIN6_bm);//turn off
    /* Set pull down to avode light LED */
    LEDPORT.PIN3CTRL = 0X0;
    LEDPORT.PIN4CTRL = 0X0;
    LEDPORT.PIN5CTRL = 0X0;
    LEDPORT.PIN6CTRL = 0X0;

    LEDPORT.DIR = 0x0;

    run = false;
    if (gState != 0) {
        sleep_enable();
        sleep_cpu();
        sleep_disable();
        cli();
        /* Wake up from RTC */
        if (gState == 2) {
            Disable_RTC();
        }
    } else {
        /* Active mode */
        while(!run){
        };
        cli();
    }

    LEDPORT.DIR = PIN3_bm | PIN4_bm | PIN5_bm | PIN6_bm;//Pin output
    
    /* switch status */
    gState++;
    if (gState > 3) gState =0;      
    };
}


ISR(PORTC_INT0_vect)
{
    run = true;
}

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