dcf77.h

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/*
 * dcf77.h
 *
 * Created: 15.10.2012 15:30:24
 *  Author: rolo
 */ 

#ifndef DCF77_H_
#define DCF77_H_

#include <stdbool.h>
#include <stdint.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <stdlib.h>
#include "Config.h"
#include "led.h"

#define DCF77_PIN   PINA
#define DCF77_PORT  PORTA
#define DCF77_DDR   DDRA
#define DCF77_PINMASK   (1<<1)

extern bool DCFInSync;

extern void DCF77int(void);
extern int32_t  GetDCFdiff();
extern void Invalidate();
extern uint8_t  min,hour;
extern int32_t  DCFdiff;

static inline void  InitDCF77(void)
{
    DCF77_DDR &= ~DCF77_PINMASK;    // DCF77-pin is input
    DCF77_PORT |= DCF77_PINMASK;    // Enable pull up
    Invalidate();
}

static inline void  RTCsync(void)
{
    static int32_t  lastDiff=0; // Keeps Track of Time Difference for hard Sync
    
    if (min==0)
    {
        return; // It saves us trouble not syncing at an hour border
    }
    DCFdiff=hour*3600l+min*60l-hrCnt*3600l-minCnt*60l-secCnt;
    if (DCFdiff<-43200)
    {
        DCFdiff+=86400l;
    }
    if (DCFdiff>=43200)
    {
        DCFdiff-=86400l;
    }
    if (DCFdiff>60 || DCFdiff<-60)  // more than a minute, step time
    {
        if (abs(DCFdiff-lastDiff)<=1)   // nearly same difference received twice, step!
        {
            if (dFlags&DFLAG_DCF77)
            {
                hprintf_P(PSTR("Step time "),DCFdiff,RTCAdj);
            }
            hrCnt=hour;
            minCnt=min;
            secCnt=0;
            DCFdiff=0;
            RTCAdj=RTC_NORMAL;
        }
        else
        {
            lastDiff=DCFdiff;
        }
    } else if (DCFdiff>0)
    {
        RTCAdj=RTC_FASTER;
    } else if (DCFdiff<0)
    {
        RTCAdj=RTC_SLOWER;
    } else
    {
        RTCAdj=RTC_NORMAL;
    }
    if (dFlags&DFLAG_DCF77)
    {
        hprintf_P(PSTR("Diff:%ld Tick: %d Adj:%s\n"),DCFdiff,tickCnt,RTCAdjTxt[RTCAdj]);
    }
    DCFInSync=true;
}



#endif /* DCF77_H_ */