meter_rtc.c

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/* This file has been prepared for Doxygen automatic documentation generation.*/
#include "meter.h"

uint8_t power_status_flag = 0;
const uint8_t days_lookup[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
RTC_BCD_t rtcTime = {0,0,0,1,1,2012};


void rtc_init()
{
        CLK.RTCCTRL =  CLK_RTCSRC_TOSC_gc | CLK_RTCEN_bm;
        do {
        } while ( RTC_Busy() );
        RTC_Initialize( RTC_CYCLES_1S, 0, 0, RTC_PRESCALER_DIV1_gc );
        RTC.INTFLAGS = RTC_OVFIF_bm | RTC_COMPIF_bm;
        RTC_SetIntLevels( RTC_OVFINTLVL_HI_gc, RTC_COMPINTLVL_OFF_gc );
        PMIC.CTRL |= PMIC_HILVLEN_bm;        
}
        
ISR(RTC_OVF_vect)
{
    SLEEP.CTRL &=  ~SLEEP_SEN_bm;
    uint8_t pin_read = 0;
    update_time();
    pin_read = PORTD.IN & PIN2_bm;
    //pin_read = PIN2_bm;
    if(pin_read == PIN2_bm)
    {
      //TCC1.CTRLA = ( TCC1.CTRLA & ~TC1_CLKSEL_gm ) | TC_CLKSEL_OFF_gc; 
      TCC1.INTCTRLA = (TCC1.INTCTRLA & ~(TC1_OVFINTLVL_gm | TC1_ERRINTLVL_gm));
      rtc_flag = 1;
    }
    else
    {
      rtc_flag = 0;
      if(power_status_flag == POWERED_UP)
      power_status_flag = POWER_OFF_DETECTED;
    }
}


void update_time()
{
        if ( ++rtcTime.sec > 59 )
        {
                rtcTime.sec = 0;
                rtcTime.min++;
        }
        if ( rtcTime.min > 59 ) 
        {
                rtcTime.min = 0;
                rtcTime.hr++;
        }
        if (rtcTime.hr > 23)
        {
                rtcTime.hr = 0;
                rtcTime.day++;
        }
        if (rtcTime.day > days_lookup[rtcTime.month-1] )
        {
                if (rtcTime.month == 2)
                {
                        if (rtcTime.year % 4 == 0 && rtcTime.day == 29)
                        {
                                asm("nop");
                        }
                        else
                        {
                                rtcTime.day = 1;
                                rtcTime.month++;
                        }
                } 
                else
                {
                rtcTime.day = 1;
                rtcTime.month++;        
                }

        }
        if (rtcTime.month > 12)
        {
                rtcTime.year++;
                rtcTime.month = 1;
        }
}