学习单片机之---C51读写DS12887程序2 [复制链接]

C51读写DS12887程序

作者：hylaliu 文章来源：侃单片机
已用于开发的无线电子衡器上
包括RTC.h及RTC.c

/////////////////////////////////////////
// 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);  
}