ds1302new.h

89c51与ds1302代码显示时间的源程序

//本头文件由-独步雨林-修改
//日期：2007-4-11

#ifndef _ds1302_H
#define _ds1302_H

#include<at89x52.h>
#include<intrins.h>
#include <String.h>

#define uchar unsigned char
#define uint unsigned int

sbit reset = P3^7;
sbit sclk  = P3^5;
sbit io    = P3^6;

#define uchar unsigned char

typedef struct
{
  unsigned char Sec;  
  unsigned char Min;
  unsigned char Hour;
  unsigned char Month;
  unsigned char MonthDay;   //月中的日
  unsigned char WeekDay;    //星期中的日
  unsigned char Year;
  unsigned char DateStr[11];  //日期字符串
  unsigned char TimeStr[8];   //时间字符串

}TDateTime;    //定义日期时间结构体

uchar init [] ={0x00,0x00,0x00,0x00,0x00,0x00,0x00};  //
/**********************************************************/
void write_byte(uchar inbyte)
{
   uchar i;
   for(i=0;i<8;i++)
   {
    sclk=0;             //写的时候低电平改变数据
    if(inbyte&0x01)
    io=1;
    else
    io=0; 
    sclk=1;            //写的时候高电平，把数据写入ds1302
    _nop_();
    inbyte=inbyte>>1;
   }
}

/**********************************************************/
uchar read_byte()    //sclk的下跳沿读数据
{
   uchar i,temp=0,tmp=0; 
   io=1;                //设置为输入口
   for(i=0;i<7;i++)
   {
    sclk=0;
    if(io==1)
    temp=temp|0x80;
    else
    temp=temp&0x7f;
    sclk=1;             //产生下跳沿
    temp=temp>>1;
   }

	tmp=temp;
	tmp=(tmp>>4)*10+(tmp &0x0f);
	return(tmp);
}

/**********************************************************/
// 往ds1302的某个地址写入数据 
/**********************************************************/
void write_ds1302(uchar cmd,uchar indata)
{
   sclk=0;
   reset=1;
   write_byte(cmd);        
   write_byte(indata);
   sclk=0;
   reset=0;
}

/**********************************************************/
// 读ds1302某地址的的数据 
/**********************************************************/
uchar read_ds1302(uchar addr)
{
   uchar backdata;
   sclk=0;
   reset=1;
   write_byte(addr);      //先写地址
   backdata=read_byte();  //然后读数据
   sclk=0;
   reset=0;
   return (backdata);
}

/**********************************************************/
// 设置初始时间
/**********************************************************/
void set_ds1302(uchar addr,uchar *p,uchar n) //写入n个数据
{
   write_ds1302(0x8e,0x00);          //写控制字，允许写操作
   for(;n>0;n--)
   {
   write_ds1302(addr,*p);
   p++;
   addr=addr+2;
   }
   write_ds1302(0x8e,0x80);          //写保护，不允许写
}

/**********************************************************/
// 读取当前时间 
/**********************************************************/
void read_nowtime(uchar addr,uchar *p,uchar n)
{
  for(;n>0;n--)
  {
    *p=read_ds1302(addr);
    p++;
    addr=addr+2;
  } 
}

/**********************************************************/
// 初始化DS1302
/**********************************************************/
void init_ds1302()
{
   reset=0;
   sclk=0;
   write_ds1302(0x80,0x00); 
   write_ds1302(0x90,0xa6); //一个二极管＋4K电阻充电
   write_ds1302(0x8e,0x80); //写保护控制字，禁止写
}

//*****************************************
//函数功能：返回当前时间
//**********************************
void GetCurrentDateTime(TDateTime *DT)
{
  unsigned char CurDateTime[7];
  read_nowtime(0x81,CurDateTime,7);

  DT->Sec=CurDateTime[0];
  DT->Min=CurDateTime[1];
  DT->Hour=CurDateTime[2];
  DT->MonthDay=CurDateTime[3];
  DT->Month=CurDateTime[4];
  DT->WeekDay=CurDateTime[5];
  DT->Year=CurDateTime[6];

  strcpy(DT->DateStr,"2007-04-11");
  strcpy(DT->TimeStr,"15:00:00");

  DT->DateStr[2]=(DT->Year/10)+0x30;
  DT->DateStr[3]=(DT->Year%10)+0x30;
  
  DT->DateStr[5]=(DT->Month/10)+0x30;
  DT->DateStr[6]=(DT->Month%10)+0x30;
 
  DT->DateStr[8]=(DT->MonthDay/10)+0x30;
  DT->DateStr[9]=(DT->MonthDay%10)+0x30;

  DT->TimeStr[0]=DT->Hour/10+0x30;
  DT->TimeStr[1]=DT->Hour%10+0x30;

  DT->TimeStr[3]=DT->Min/10+0x30;
  DT->TimeStr[4]=DT->Min%10+0x30;

  DT->TimeStr[6]=DT->Sec/10+0x30;
  DT->TimeStr[7]=DT->Sec%10+0x30;

} 

//设置时间
void SetDateTime(TDateTime *DT)
{
  unsigned char Str[7];

  Str[0]=DT->Sec/10*16+DT->Sec%10;
  Str[1]=DT->Min/10*16+DT->Min%10;
  Str[2]=DT->Hour/10*16+DT->Hour%10;
  Str[3]=DT->MonthDay/10*16+DT->MonthDay%10;
  Str[4]=DT->Month/10*16+DT->Month%10;
  Str[5]=DT->WeekDay/10*16+DT->WeekDay%10;
  Str[6]=DT->Year/10*16+DT->Year%10;

  set_ds1302(0x80,Str,7);
}

#endif