ds1302.c

使用51单片机作为控制器

///////////////////////////////系统时钟////////////////////////////////
#include <at89x52.h>
#define uchar unsigned char
#define uint  unsigned int

sbit    RST        =    P1^6;
sbit    SCL        =    P1^4;
sbit    SDA        =    P1^5;

#define READ            1
#define WRITE           0

unsigned char  SetTimeBuf[7]  =         {0x0,0x18,0x17,0x31,0x1,0x3,0x7};  
//2007年1月18日20:30:00,当前时间格式为: 秒 分 时 日 月 星期 年      
unsigned char  TimeBuf[7];

void DS1302_SendByte(unsigned char Data)
{
    unsigned char i;
    for(i=0;i<8;i++)
    {
        SDA = (bit)(Data & 0x01);
        SCL = 1;
        SCL = 0;
        Data >>= 1;
    }
    return;
}


unsigned char DS1302_ReadByte(void)
{
    unsigned char i,Data;
    for(i=0;i<8;i++) 
    {	
		SDA=0;
        Data >>= 1;
        if(SDA==1) Data |= 0x80;        
		SCL = 1;
        SCL = 0;
        
    }
    return(Data);
}

void  DS1302WriteByte(unsigned char Addr, unsigned char Data)
{
    SCL = 0;
    RST = 1;
    DS1302_SendByte(Addr);
    DS1302_SendByte(Data);
    RST = 0;
}

unsigned char DS1302ReadByte(unsigned char Addr)
{
    unsigned char Data;
    SCL = 0;
    RST = 1;
    DS1302_SendByte(Addr | READ);
    Data = DS1302_ReadByte();
    RST = 0;
    return Data;
}


void SetTime(void)
{
    uchar i,temp=0x80;
    DS1302WriteByte(0x8e,0x00);        //允许读写WP=0
    for(i=0;i<7;i++)
    {
        DS1302WriteByte(temp,SetTimeBuf[i]);
        temp+=2;
  	}
    DS1302WriteByte(0x90,0xa5);        //充电器设置,禁止充电
    //DS1302WriteByte(0x8e,0x80);        //禁止写WP=1，write protect
}



unsigned char BCDConvert(unsigned char ucBCD)//ucBCD为待转换的BCD码；
{
	unsigned char TempH,TempL;
	TempH = (ucBCD&0xF0)>>4;    //TempH保存十进制数的高位
	TempL = ucBCD&0x0f;         //TempL保存十进制数的低位
	return TempH*10+TempL;
}
	
void ReadTime(void)
{
    uchar i,temp,adderss=0x81;
    for(i=0;i<7;i++)
    {
        temp=DS1302ReadByte(adderss);
        TimeBuf[i]=BCDConvert(temp);
        adderss+=2;        
    }
}