ds12887读写的c51源程序.c

DS12887时钟芯片读写的C51源程序

// 接口 RTC.h 
//////////////////////////////////////// 
#include <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); 
 
 
///////////////////////////////////////// 
// 实现部分 RTC.C 
//////////////////////////////////////// 
#include <reg52.h> 
#include<absacc.h> 
#include<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);     
}