ds1302.c

基于51单片机

#include <reg51.h>

/*************************宏定义******************************/
#define uchar unsigned char
#define uint  unsigned int

/************************管脚定义******************************/
sbit  DS1302_CLK = P1^6;              //实时时钟时钟线引脚 
sbit  DS1302_IO  = P1^7;              //实时时钟数据线引脚 
sbit  DS1302_RST = P1^5;              //实时时钟复位线引脚
sbit  ACC0 = ACC^0;
sbit  ACC7 = ACC^7;

/************************DS1302数据地址************************/
#define DS1302_SECOND	0x80
#define DS1302_MINUTE	0x82
#define DS1302_HOUR		0x84 
#define DS1302_WEEK		0x8A
#define DS1302_DATE		0x86
#define DS1302_MONTH	   0x88
#define DS1302_YEAR		0x8C

/************************外部调用数组************************/
//extern uchar data time[7];//秒,分,时,周,日,月,年


/*******************DS1302InputByte()*******************/
void DS1302InputByte(unsigned char d) 	//实时时钟写入一字节(内部函数)
{ 
    unsigned char i;
    ACC = d;
    for(i=8; i>0; i--)
    {
        DS1302_IO = ACC0;           	//相当于汇编中的 RRC
        DS1302_CLK = 1;
        DS1302_CLK = 0;
        ACC = ACC >> 1; 
    } 
}

/*******************DS1302OutputByte()*******************/
unsigned char DS1302OutputByte(void) 	//实时时钟读取一字节(内部函数)
{ 
    unsigned char i;
    for(i=8; i>0; i--)
    {
        ACC = ACC >>1;         			//相当于汇编中的 RRC 
        ACC7 = DS1302_IO;
        DS1302_CLK = 1;
        DS1302_CLK = 0;
    } 
    return(ACC); 
}

/*******************DS1302OWrite1302()*******************/
void Write1302(unsigned char ucAddr, unsigned char ucDa)	//ucAddr: DS1302地址, ucData: 要写的数据
{
    DS1302_RST = 0;
    DS1302_CLK = 0;
    DS1302_RST = 1;
    DS1302InputByte(ucAddr);       	// 地址，命令 
    DS1302InputByte(ucDa);       	// 写1Byte数据
    DS1302_CLK = 1;
    DS1302_RST = 0;
} 

/*******************DS1302ORead1302()*******************/
unsigned char Read1302(unsigned char ucAddr)	//读取DS1302某地址的数据
{
    unsigned char ucData;
    DS1302_RST = 0;
    DS1302_CLK = 0;
    DS1302_RST = 1;
    DS1302InputByte(ucAddr|0x01);        // 地址;最低有效位(位0)如为0表示要进行写操作,反之为读
    ucData = DS1302OutputByte();         // 读1Byte数据
    DS1302_CLK = 1;
    DS1302_RST = 0;
    return(ucData);
}

/*******************DS1302_SetProtect()*******************/
void DS1302_SetProtect(bit flag)        //是否写保护 1为打开写保护,0为关闭写保护
{
	if(flag)
		Write1302(0x8E,0x10);          // 控制命令,WP=1,写保护
	else
		Write1302(0x8E,0x00);          // 控制命令,WP=0,写操作
}

/*******************DS1302_SetTime()*******************/
void DS1302_SetTime(unsigned char Address, unsigned char Value)        // 设置时间函数
{
	DS1302_SetProtect(0);
	Write1302(Address, ((Value/10)<<4 | (Value%10))); 
}

/*******************DS1302_GetTime()*******************/
void DS1302_GetTime(char *time)
{
	unsigned char ReadValue;
	ReadValue = Read1302(DS1302_SECOND);
	time[0] = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);
	ReadValue = Read1302(DS1302_MINUTE);
	time[1] = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);
	ReadValue = Read1302(DS1302_HOUR);
	time[2] = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);
	ReadValue = Read1302(DS1302_DATE);
	time[3] = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);	
	ReadValue = Read1302(DS1302_WEEK);
	time[4] = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);
	ReadValue = Read1302(DS1302_MONTH);
	time[5] = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);
	ReadValue = Read1302(DS1302_YEAR);
	time[6] = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F);	

}


/*******************Initial_DS1302*******************/
void Initial_DS1302(void)
{
	unsigned char Second=Read1302(DS1302_SECOND);
	if(Second&0x80)		  
		DS1302_SetTime(DS1302_SECOND,0);
}