rtccwritealrmdate.c

Mplab C30编译器

#if defined(__dsPIC33F__)
#include <p33Fxxxx.h>
#elif defined(__PIC24H__)
#include "p24hxxxx.h"
#endif

#include "Rtcc.h"

#ifdef _TMR_RTCC_V1

/*********************************************************************
 * Function:        void RtccWriteAlrmDate(const rtccDate* pDt)
 *
 * PreCondition:    pDt a valid rtccDate pointer having proper values:
 *                      - wday: BCD codification, 00-06 
 *                      - mday: BCD codification, 01-31
 *                      - mon: BCD codification, 01-12
 * Input:           pDt - pointer to a constant rtccDate union
 * Output:          None
 * Side Effects:    None
 * Overview:        The function sets the alarm date in the RTCC device.
 * Note:            - The write is successful only if Wr Enable is set.
 *                  The function will enable the write itself, if needed.
 *                  Also, the Alarm will be temporarily disabled in order
 *                  to safely perform the update of the ALRMTIME register.
 *                  However, the device status will be restored.
 * 
 *                  - Note that the alarm date does not contain a year field.
 ********************************************************************/
BOOL RtccWriteAlrmDate(const rtccDate* pDt)
{
   WORD_VAL tempHourWDay ;
   WORD_VAL tempDayMonth ;

   BOOL    wasWrEn;
   BOOL    wasAlrm;

   if((MAX_MON < pDt->f.mon) || (MIN_MON > pDt->f.mon) || (MAX_MDAY < pDt->f.mday) || (MIN_MDAY > pDt->f.mday) || 
      (MAX_YEAR < pDt->f.year))
   {
       return(FALSE);
   }

   tempDayMonth.byte.LB = pDt->f.mday;
   tempDayMonth.byte.HB = pDt->f.mon;

   if(!(wasWrEn=mRtccIsWrEn()))
   {
       RtccWrOn();            // have to allow the WRTEN in order to write the new value
   }
   if((wasAlrm=mRtccIsAlrmEnabled()))
   {
       mRtccAlrmDisable();     // avoid spurious alarm interrupts
   }

   mRtccClearAlrmPtr();
   mRtccSetAlrmPtr(RTCCPTR_MASK_HRSWEEK);

   tempHourWDay.Val = ALRMVAL;
   tempHourWDay.byte.LB = pDt->f.wday;

   mRtccClearRtcPtr();
   mRtccSetRtcPtr(RTCCPTR_MASK_DAYMON);

   ALRMVAL =tempDayMonth.Val;
   ALRMVAL = tempHourWDay.Val;

   if(wasAlrm)
   {
       mRtccAlrmEnable();
   }
   if(!wasWrEn)
   {
       mRtccWrOff();
   }

   return(TRUE);
}


#else
#warning "Does not build on this target"
#endif