C51讀寫DS12887程序
 

C51讀寫DS12887程序
已用于開發(fā)的無線電子衡器上
包括RTC.h及RTC.c
/////////////////////////////////////////
// 接口 RTC.h
////////////////////////////////////////
＃i nclude <reg52.h>
//*******DS12887 *******
#define YEAR_IN_RTC            0
#define MONTH_IN_RTC           1
#define DAY_IN_RTC             2
#define HOUR_IN_RTC            3
#define MINUTE_IN_RTC          4
#define SECOND_IN_RTC          5
#define SECOND_ALARM_IN_RTC 6
#define MINUTE_ALARM_IN_RTC 7
#define HOUR_ALARM_IN_RTC    8
#define RTC_SECONDS           XBYTE[0xfe00]
#define RTC_SECONDS_ALARM    XBYTE[0xfe01]
#define RTC_MINUTES           XBYTE[0xfe02]
#define RTC_MINUTES_ALARM   XBYTE[0xfe03]
#define RTC_HOURS             XBYTE[0xfe04]
#define RTC_HOURS_ALARM     XBYTE[0xfe05]
#define RTC_DAYS              XBYTE[0xfe07] 
#define RTC_MONTHS            XBYTE[0xfe08]                 
#define RTC_YEARS             XBYTE[0xfe09]
#define DSA                   XBYTE[0xfe0a]              //DS12887 register A
#define DSB                   XBYTE[0xfe0b]
#define DSC                   XBYTE[0xfe0c]
#define DSD                   XBYTE[0xfe0d]
sbit RTC_CS=P2^0;
bit Init_RTC(void);
bit Second_Interrupt(void);
unsigned char Read_RTC(unsigned char);
void Write_RTC(unsigned char,unsigned char);

/////////////////////////////////////////
// 實現(xiàn)部分 RTC.C
////////////////////////////////////////
＃i nclude <reg52.h>
＃i nclude<absacc.h>
＃i nclude<RTC.h>
unsigned char Read_RTC(unsigned char option)
{
  
  switch(option)
  {
    case YEAR_IN_RTC:return(RTC_YEARS);break;
    case MONTH_IN_RTC:return(RTC_MONTHS);break;
    case DAY_IN_RTC:return(RTC_DAYS);break;
    case HOUR_IN_RTC:return(RTC_HOURS);break;
    case MINUTE_IN_RTC:return(RTC_MINUTES);break;
    case SECOND_IN_RTC:return(RTC_SECONDS);break;
  }
}
void Write_RTC(unsigned char option,unsigned char j)
{
  switch(option)
  {
    case YEAR_IN_RTC:RTC_YEARS=j;break;
    case MONTH_IN_RTC:RTC_MONTHS=j;break;
    case DAY_IN_RTC:RTC_DAYS=j;break;
    case HOUR_IN_RTC:RTC_HOURS=j;break;
    case MINUTE_IN_RTC:RTC_MINUTES=j;break;
    case SECOND_IN_RTC:RTC_SECONDS=j;break;
    case SECOND_ALARM_IN_RTC:RTC_SECONDS_ALARM=j;break;
    case MINUTE_ALARM_IN_RTC:RTC_MINUTES_ALARM=j;break;
    case HOUR_ALARM_IN_RTC:RTC_HOURS_ALARM=j;break;
  }
}

bit Second_Interrupt(void)
{
    if( (DSC&0x20)==0x20 )return(1);
    return(0);
}

/*  initialize DS12887  */
bit Init_RTC(void)
{
    DSA=0x20;
    DSB=0x72;                                  //SET=0,*IE=disenable,SQW=disenable ,BCD,NO DSE
    DSC=0x00;
    ACC=DSD;
    //every second interrupt
    Write_RTC(HOUR_ALARM_IN_RTC,0xff);
    Write_RTC(MINUTE_ALARM_IN_RTC,0xff);
    Write_RTC(SECOND_ALARM_IN_RTC,0xff);
    //if(ACC&0x80)return(0); //when low bat return 0
    //return(1);
     /* DSB=0x82;                                   //set SET=1
  RTC_HOURS=0x23;
  RTC_MINUTES=0x12;
  RTC_SECONDS=0x30;
  DSB=0x02;
   */
  return(1);    
}