rtccreadtimedate.c

来自「基於 c51/8051 的 nand Flash Memory HY27US08」· C语言 代码 · 共 52 行

#if defined(__PIC24F__)
#include <p24Fxxxx.h>
#endif
#include "Rtcc.h"



#ifdef _TMR_RTCC_V1

/*********************************************************************
 * Function:        void RtccReadTimeDate(rtccTimeDate* pTD)
 *
 * PreCondition:    None
 * Input:           pTD - pointer to a rtccTimeDate union to store the current 
 *                        time and date
 * Output:          None
 * Side Effects:    None
 * Overview:        The function updates the user supplied union/structure with
 *                  the current time and date of the RTCC device.
 * Note:            This firmware solution would consist of reading each       
 *                  register twice and then comparing the two values. If the   
 *                  two values match, then a rollover did not occur.
 ********************************************************************/
void RtccReadTimeDate(rtccTimeDate* pTD)
{
   rtccTimeDate	currTD;
   do
   {
      mRtccClearRtcPtr();
      mRtccSetRtcPtr(RTCCPTR_MASK_YEAR);

      pTD->w[0]=RTCVAL;
      pTD->w[1]=RTCVAL;
      pTD->w[2]=RTCVAL;
      pTD->w[3]=RTCVAL;    // read the user value
   
      mRtccClearRtcPtr();
      mRtccSetRtcPtr(RTCCPTR_MASK_YEAR);
   
      currTD.w[0]=RTCVAL;
      currTD.w[1]=RTCVAL;
      currTD.w[2]=RTCVAL;
      currTD.w[3]=RTCVAL;    // read the user value

   }while(pTD->f.sec!=currTD.f.sec);	// make sure you have the same sec
}


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