DS1302時(shí)鐘模塊及其驅(qū)動(dòng)代碼介紹

一、DS1302時(shí)鐘模塊

現(xiàn)在流行的串行時(shí)鐘電路很多，如DS1302、 DS1307、PCF8485等。這些電路的接口簡(jiǎn)單、價(jià)格低廉、使用方便，被廣泛地采用。

DS1302 是美國(guó)DALLAS公司推出的一種高性能、低功耗、帶RAM的實(shí)時(shí)時(shí)鐘電路，它可以對(duì)年、月、日、周、時(shí)、分、秒進(jìn)行計(jì)時(shí)，具有閏年補(bǔ)償功能，工作電壓為2.0V～5.5V。采用三線接口與CPU進(jìn)行同步通信，并可采用突發(fā)方式一次傳送多個(gè)字節(jié)的時(shí)鐘信號(hào)或RAM數(shù)據(jù)。

DS1302內(nèi)部有一個(gè)31×8的用于臨時(shí)性存放數(shù)據(jù)的RAM寄存器。DS1302是DS1202的升級(jí)產(chǎn)品，與DS1202兼容，但增加了主電源/后備電源雙電源引腳，同時(shí)提供了對(duì)后備電源進(jìn)行涓細(xì)電流充電的能力，該芯片采用普通32.768kHz晶振，DS1302 工作時(shí)功耗很低保持?jǐn)?shù)據(jù)和時(shí)鐘信息時(shí)功率小于1mW。

圖1 DS1302時(shí)鐘模塊實(shí)物圖

圖2 DS1302時(shí)鐘模塊封裝

DS1302時(shí)鐘模塊的引腳功能介紹如表1所示，而時(shí)序不再做陳述，需要再自行查找資料。

二、DS1302時(shí)鐘模塊驅(qū)動(dòng)代碼

1.頭文件

#ifndef DS1302_H

#define DS1302_H

#include"STC15F2K60S2.h"

#ifndef UINT8

#define UINT8unsigned char

#endif

#ifndefDS1302_READ_BURST

#defineDS1302_READ_BURST 0xBF

#endif

#ifndefDS1302_WRITE_BURST

#defineDS1302_WRITE_BURST 0xBE

#endif

sbitDS1302_IO = P1^4;

sbitDS1302_RST = P1^5;

sbit DS1302_SCLK =P1^3;

extern UINT8 xdatatime[9];

extern UINT8 xdatadate[11];

extern UINT8 xdatacurrent_day[2];

//聲明全局變量

voidDS1302_WriteByte(UINT8 data_byte);//向ds1302寫一個(gè)字節(jié)

voidDS1302_ReadByte(UINT8 *data_byte);//從ds1302讀一個(gè)字節(jié)

voidDS1302_Start();//操作起始信號(hào)

voidDS1302_Over();//操作結(jié)束信號(hào)

voidDS1302_ClearWriteProtection();//清除寫保護(hù)

voidDS1302_SetWriteProtection();//設(shè)置寫保護(hù)

voidDS1302_SetTime(UINT8 *ds1302_set_buffer);//設(shè)置ds1302的時(shí)間

voidDS1302_ReadTime(UINT8 *ds1302_build_buffer);//讀取ds1302的時(shí)間

voidTime_Build();//系統(tǒng)從ds1302讀取時(shí)間

void Time_Set();//系統(tǒng)向ds1302設(shè)置時(shí)間

voidTime_Init();//系統(tǒng)時(shí)間初始化

#endif

2.主程序

#include"ds1302.h"

voidDS1302_WriteByte(UINT8 data_byte)//向ds1302寫一個(gè)字節(jié)

{

复制UINT8 i;

   

    for (i=0;i< 8;i++)

    {

            DS1302_IO = data_byte &0x01;

            DS1302_SCLK = 1;

            data_byte > >= 1;

            DS1302_SCLK = 0;

    }

}

voidDS1302_ReadByte(UINT8 *data_byte) //從ds1302讀一個(gè)字節(jié)

{

复制UINT8 i;

   

    for (i=0;i< 8;i++)

    {      

            *data_byte > >= 1;

            if (DS1302_IO){*data_byte |=0x80;}

            DS1302_SCLK = 1;

            DS1302_SCLK = 0;

    }

}

voidDS1302_Start()//操作起始信號(hào)

{

复制DS1302_RST  = 0;

    DS1302_SCLK = 0;

    DS1302_RST  = 1;

}

voidDS1302_Over()//操作結(jié)束信號(hào)

{

复制DS1302_IO  = 0;

    DS1302_RST = 0;

}

voidDS1302_ClearWriteProtection()//清除寫保護(hù)

{

复制DS1302_Start();

    DS1302_WriteByte(0x8E);

    DS1302_WriteByte(0x00);

    DS1302_Over();

}

voidDS1302_SetWriteProtection()//設(shè)置寫保護(hù)

{

复制DS1302_Start();

    DS1302_WriteByte(0x8E);

    DS1302_WriteByte(0x80);

    DS1302_Over();

}

voidDS1302_SetTime(UINT8 *ds1302_set_buffer)//突發(fā)模式下設(shè)置時(shí)間

{

复制UINT8 i;



    DS1302_ClearWriteProtection();



    DS1302_Start();

    DS1302_WriteByte(DS1302_WRITE_BURST);

    for (i=0; i< 7; i++)

    {

            DS1302_WriteByte(ds1302_set_buffer[i]);

    }

    DS1302_WriteByte(0x80);//突發(fā)模式一次要寫8個(gè)字節(jié)，第八個(gè)字節(jié)是寫保護(hù)字節(jié)

    DS1302_Over();

}

void DS1302_ReadTime(UINT8*ds1302_read_buffer)//突發(fā)模式下讀取時(shí)間

{

复制UINT8 i,Temp;



    DS1302_ClearWriteProtection();



    DS1302_Start();

    DS1302_WriteByte(DS1302_READ_BURST);

    for (i=0; i< 7; i++)

    {

            DS1302_ReadByte(ds1302_read_buffer+i);

    }

    DS1302_ReadByte(&Temp);//突發(fā)模式一次讀8個(gè)字節(jié)，最后一字節(jié)讀出來(lái)沒(méi)用

    DS1302_Over();



    DS1302_SetWriteProtection();

}

voidTime_Build()//讀取時(shí)間后轉(zhuǎn)換成需要的格式

{

复制UINT8 xdata ds1302_build_buffer[7];

   

    DS1302_ReadTime(ds1302_build_buffer);

    time[7] =(ds1302_build_buffer[0]&0x0f)+'0';

    time[6] =((ds1302_build_buffer[0]&0x70) >>4)+'0';

    time[4] =(ds1302_build_buffer[1]&0x0f)+'0';

    time[3] =((ds1302_build_buffer[1]&0x70) >>4)+'0';

    time[1] =(ds1302_build_buffer[2]&0x0f)+'0';

    time[0] =((ds1302_build_buffer[2]&0x30) >>4)+'0';

    date[9] =(ds1302_build_buffer[3]&0x0f)+'0';

    date[8] =((ds1302_build_buffer[3]&0x30) >>4)+'0';

    date[6] =(ds1302_build_buffer[4]&0x0f)+'0';

    date[5] =((ds1302_build_buffer[4]&0x10) >>4)+'0';

    date[3] =(ds1302_build_buffer[6]&0x0f)+'0';

    date[2] = ((ds1302_build_buffer[6]&0xf0) >>4)+'0';

}

void Time_Set()//將時(shí)間轉(zhuǎn)化為對(duì)應(yīng)格式存入ds1302

{

复制UINT8 xdata ds1302_set_buffer[7];

   

    ds1302_set_buffer[0]  = time[7]-'0';

    ds1302_set_buffer[0] |=((time[6]-'0')&0x07)< 4;

    ds1302_set_buffer[1]  = time[4]-'0';

    ds1302_set_buffer[1] |=((time[3]-'0')&0x07)< 4;

    ds1302_set_buffer[2]  = time[1]-'0';

    ds1302_set_buffer[2] |=((time[0]-'0')&0x03)< 4;

    ds1302_set_buffer[3]  = date[9]-'0';

    ds1302_set_buffer[3] |=((date[8]-'0')&0x03)< 4;

    ds1302_set_buffer[4]  = date[6]-'0';

    ds1302_set_buffer[4] |=((date[5]-'0')&0x01)< 4;

    ds1302_set_buffer[6]  = date[3]-'0';

    ds1302_set_buffer[6] |=((date[2]-'0')&0x0f)< 4;

    ds1302_set_buffer[5] = 0x01;

    DS1302_SetTime(ds1302_set_buffer);

}

void Time_Init()//開機(jī)時(shí)間初始化

{

复制Time_Build();

    current_day[0] = date[8];

    current_day[1] = date[9];//保存當(dāng)前日期，用于檢測(cè)日期變化

}

三、 DS1302時(shí)鐘模塊與USRAT HMI通信

uchara=0,b=0,c=0,d=0,e=0,f=0;

复制/**********顯示時(shí)間**********/        

a = date[2];    //發(fā)送年數(shù)據(jù)

b = date[3];

c = date[5];    //發(fā)送月數(shù)據(jù)

d = date[6];

e = date[8];    //發(fā)送日數(shù)據(jù)

f = date[9];

write_txt("t0.txt=");   //發(fā)送文本

write_COM(34);         //雙引號(hào)

write_COM(a);

write_COM(b);

write_COM(34);

write_END();               //結(jié)束符

write_txt("t1.txt=");   //發(fā)送文本

write_COM(34);         //雙引號(hào)

write_COM(c);

write_COM(d);

write_COM(34);

write_END();               //結(jié)束符

write_txt("t2.txt=");   //發(fā)送文本

write_COM(34);         //雙引號(hào)

write_COM(e);

write_COM(f);

write_COM(34);

write_END();               //結(jié)束符





a = time[0];    //發(fā)送時(shí)數(shù)據(jù)

b = time[1];

c = time[3];    //發(fā)送分鐘數(shù)據(jù)

d = time[4];

e = time[6];    //發(fā)送秒鐘數(shù)據(jù)

f = time[7];

write_txt("t3.txt=");   //發(fā)送文本

write_COM(34);         //雙引號(hào)

write_COM(a);

write_COM(b);

write_COM(34);

write_END();               //結(jié)束符

write_txt("t4.txt=");   //發(fā)送文本

write_COM(34);         //雙引號(hào)

write_COM(c);

write_COM(d);

write_COM(34);

write_END();               //結(jié)束符

write_txt("t5.txt=");   //發(fā)送文本

write_COM(34);         //雙引號(hào)

write_COM(e);

write_COM(f);

write_COM(34);

write_END();               //結(jié)束符



write_txt("t9.txt=");   //發(fā)送文本

write_COM(34);

if(week==1)                        //發(fā)送星期數(shù)據(jù)

    write_txt("一");

if(week==2)

    write_txt("二");

if(week==3)

    write_txt("三");

if(week==4)

    write_txt("四");

if(week==5)

    write_txt("五");

if(week==6)

    write_txt("六");

if(week==7)

    write_txt("日");

write_COM(34);

write_END();