ds1302_alexi.h

数字时钟芯片DS1302的驱动~ 以及和LCD1602的最简驱动构成万年历的程序~

/*--------------------------------------------
File Name :DS1302.H
Author :   Alexi
Created:   2008/6/18
---------------------------------------------*/

/*-------------------------------------------*/
#ifndef DS1302_H
#define DS1302_H
/*-------------------------------------------*/


sbit DS1302_CLK = P1^0;   //时钟引脚
sbit DS1302_IO  = P1^1;   //数据引脚
sbit DS1302_RST = P1^2;   //复位引脚
sbit ACC0 = ACC^0;
sbit ACC7 = ACC^7;
/*-------------------------------------------*/
#define unchar unsigned char 
#define unint  unsigned int 
/*-------------------------------------------*/
typedef struct _SYSTEMTIME_
{
	unchar Second;
	unchar Minute;
	unchar Hour;
	unchar Week;
	unchar Day;
	unchar Month;
	unchar Year;
	unchar DateString[9];
	unchar TimeString[9];
}SYSTEMTIME;    //定义时间类型

/*-------------------------------------------*/
//宏定义便于理解
#define AM(X) X
#define PM(X) (X+12)
#define DS1302_SECOND      0x80
#define DS1302_MINUTE      0x82
#define DS1302_HOUR        0x84
#define DS1302_WEEK        0x8A
#define DS1302_DAY         0x86
#define DS1302_MONTH       0x88
#define DS1302_YEAR        0x8C
#define DS1302_RAM(X)      (0xC0+(X)*2)  //用于计算RAM地址的宏运算
/*-------------------------------------------*/






/*-------------------------------------------*/
//函数声明
void DS1302_InputByte(unchar Data);           //写入一个字节(内部函数)
unchar DS1302_OutputByte(void);               //读取一个字节(内部函数)
void Write1302(unchar Address, unchar Data);  //在指定地址写入指定的数据
unchar Read1302(unchar Address);              //读取DS1302指定地址中的数据
void DS1302_SetProtect(bit Flag);             //DS1302是否写入保护
void DS1302_SetTime(unchar Address, unchar Value);//设置时间函数
void DS1302_GetTime(SYSTEMTIME *Time);        //读出时间
void DateToStr(SYSTEMTIME *Time);             //日期转化成字符
void TimeToStr(SYSTEMTIME *Time);             //时间转化成字符
void DS1302_Initial (void);                    //DS1302初始化
/*-------------------------------------------*/




/*-------------------------------------------*/
//写入一个字节(内部函数)
void DS1302_InputByte(unchar Data)  
{
	unchar i;
	ACC = Data;
	for(i=8; i>0; i--)
	{
		DS1302_IO = ACC0;
		DS1302_CLK = 1;
		DS1302_CLK = 0;
		ACC >>= 1;
	}
}
/*-------------------------------------------*/



/*-------------------------------------------*/
//读取一个字节(内部函数)
unchar DS1302_OutputByte(void)
{
	unchar i;
	for(i=8; i>0; i--)
	{
		ACC >>= 1;
		ACC7 = DS1302_IO;
		DS1302_CLK = 1;
		DS1302_CLK = 0;       //CDS1302_CLK下降沿读出DS1302的数据
	}
	return (ACC);
}
/*-------------------------------------------*/



/*-------------------------------------------*/
//在指定地址写入指定的数据
void Write1302(unchar Address, unchar Data)
{
	DS1302_RST = 0;
	DS1302_CLK = 0;
	DS1302_RST = 1; 
	DS1302_InputByte(Address);
	DS1302_InputByte(Data);
	DS1302_CLK = 1;
	DS1302_RST = 0;
}
/*-------------------------------------------*/



/*-------------------------------------------*/
//读取1302指定地址中的数据
unchar Read1302(unchar Address)
{
	unchar Data;
	DS1302_RST = 0;
	DS1302_CLK = 0;
	DS1302_RST = 1;
	DS1302_InputByte(Address|0x01);
	Data = DS1302_OutputByte();
	DS1302_CLK = 1;
	DS1302_RST = 0;
	return (Data);
}
/*-------------------------------------------*/



/*-------------------------------------------*/
//是否写入保护
void DS1302_SetProtect(bit Flag)
{
	if(Flag)
		Write1302(0x8E,0x80);  //0x8e控制字节地址,bit7=WP WP=1 禁止数据写入DS1302
	else
		Write1302(0x8E,0x00);  //WP=0 允许数据写入DS1302
}
/*-------------------------------------------*/



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



/*-------------------------------------------*/
//读出时间
void DS1302_GetTime(SYSTEMTIME *Time)
{
	unchar ReadValue;
	ReadValue = Read1302(DS1302_SECOND);
	Time->Second = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0f);
	ReadValue = Read1302(DS1302_MINUTE);
	Time->Minute = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0f);
	ReadValue = Read1302(DS1302_HOUR);
	Time->Hour   = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0f);
	ReadValue = Read1302(DS1302_DAY);
	Time->Day    = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0f);
	ReadValue = Read1302(DS1302_WEEK);
	Time->Week   = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0f);
	ReadValue = Read1302(DS1302_MONTH);
	Time->Month  = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0f);
	ReadValue = Read1302(DS1302_YEAR);
	Time->Year   = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0f);
}
/*-------------------------------------------*/




/*-------------------------------------------*/
//日期转化成字符
void DateToStr(SYSTEMTIME *Time)
{
	Time->DateString[0] = Time->Year/10 + '0';
	Time->DateString[1] = Time->Year%10 + '0';
	Time->DateString[2] = '-';
	Time->DateString[3] = Time->Month/10 + '0';
	Time->DateString[4] = Time->Month%10 + '0';
	Time->DateString[5] = '-';
	Time->DateString[6] = Time->Day/10 + '0';
	Time->DateString[7] = Time->Day%10 + '0';
	Time->DateString[8] = '\0';
}
/*-------------------------------------------*/




/*-------------------------------------------*/
//时间转化成字符
void TimeToStr(SYSTEMTIME *Time)
{
	Time->TimeString[0] = Time->Hour/10 + '0';
	Time->TimeString[1] = Time->Hour%10 + '0';
	Time->TimeString[2] = ':';
	Time->TimeString[3] = Time->Minute/10 + '0';
	Time->TimeString[4] = Time->Minute%10 + '0';
	Time->TimeString[5] = ':';
	Time->TimeString[6] = Time->Second/10 + '0';
	Time->TimeString[7] = Time->Second%10 + '0';
	Time->TimeString[8] = '\0';
}
/*-------------------------------------------*/



/*-------------------------------------------*/
//初始化DS1302
void DS1302_Initial (void)
{
	unchar Second=Read1302(DS1302_SECOND);
	if(Second&0x80)              //bit7=CH CH=0 振荡器允许工作,CH=1振荡器停止工作
		DS1302_SetTime(DS1302_SECOND,0);
}
/*-------------------------------------------*/



#endif