DS1302组件

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DS1302.h

#ifndef _DS1302_H#define _DS1302_Hsbit DS1302_CE = P1^7;sbit DS1302_SCLK = P3^5;sbit DS1302_IO = P3^4;typedef struct sTime {  //日期时间结构体定义    uint16_t year;  //年    uint8_t mon;   //月    uint8_t day;   //日    uint8_t hour;  //时    uint8_t minute;   //分    uint8_t sec;   //秒    uint8_t week;  //星期} sTime_t;void DS1302byteWrite(uint8_t dat);uint8_t DS1302byteRead();void DS1302singleWrite(uint8_t reg, uint8_t dat);uint8_t DS1302singleRead(uint8_t reg);void DS1302burstWrite(uint8_t * dat);void DS1302burstRead(uint8_t * dat);void getRealTime(sTime_t * time);void setRealTime(sTime_t * time);void DS1302init();#endif // _DS1302_H

DS1302.c

/* * 文件名：DS1302.c * 描  述：实时时钟芯片DS1302驱动模块 */#include <reg52.h>#include "stdint.h"#include "DS1302.h"/* 发送一个字节到DS1302通信总线上 */void DS1302byteWrite(uint8_t dat) {    uint8_t mask;    for (mask = 0x01; mask != 0; mask <<= 1) {   //低位在前，逐位移出        if ((mask & dat) != 0) //首先输出该位数据            DS1302_IO = 1;        else            DS1302_IO = 0;        DS1302_SCLK = 1;       //然后拉高时钟        DS1302_SCLK = 0;       //再拉低时钟，完成一个位的操作    }    DS1302_IO = 1;           //最后确保释放IO引脚}/* 由DS1302通信总线上读取一个字节 */uint8_t DS1302byteRead() {    uint8_t mask, dat = 0;    for (mask = 0x01; mask != 0; mask <<= 1) {   //低位在前，逐位读取        if (DS1302_IO != 0) {   //首先读取此时的IO引脚，并设置dat中的对应位            dat |= mask;        }        DS1302_SCLK = 1;       //然后拉高时钟        DS1302_SCLK = 0;       //再拉低时钟，完成一个位的操作    }    return dat;              //最后返回读到的字节数据}/* 用单次写操作向某一寄存器写入一个字节，reg-寄存器地址，dat-待写入字节 */void DS1302singleWrite(uint8_t reg, uint8_t dat) {    DS1302_CE = 1;                   //使能片选信号    DS1302byteWrite((reg << 1) | 0x80);  //发送写寄存器指令    DS1302byteWrite(dat);            //写入字节数据    DS1302_CE = 0;                   //除能片选信号}/* 用单次读操作从某一寄存器读取一个字节，reg-寄存器地址，返回值-读到的字节 */uint8_t DS1302singleRead(uint8_t reg) {    uint8_t dat;    DS1302_CE = 1;                   //使能片选信号    DS1302byteWrite((reg << 1) | 0x81);  //发送读寄存器指令    dat = DS1302byteRead();          //读取字节数据    DS1302_CE = 0;                   //除能片选信号    return dat;}/* 用突发模式连续写入8个寄存器数据，dat-待写入数据指针 */void DS1302burstWrite(uint8_t * dat) {    uint8_t i;    DS1302_CE = 1;    DS1302byteWrite(0xBE);  //发送突发写寄存器指令    for (i = 0; i < 8; i++) {   //连续写入8字节数据        DS1302byteWrite(dat[i]);    }    DS1302_CE = 0;}/* 用突发模式连续读取8个寄存器的数据，dat-读取数据的接收指针 */void DS1302burstRead(uint8_t * dat) {    uint8_t i;    DS1302_CE = 1;    DS1302byteWrite(0xBF);  //发送突发读寄存器指令    for (i = 0; i < 8; i++) {   //连续读取8个字节        dat[i] = DS1302byteRead();    }    DS1302_CE = 0;}/* 获取实时时间，即读取DS1302当前时间并转换为时间结构体格式 */void getRealTime(sTime_t * time) {    uint8_t buf[8];    DS1302burstRead(buf);    time->year = buf[6] + 0x2000;    time->mon  = buf[4];    time->day  = buf[3];    time->hour = buf[2];    time->minute = buf[1];    time->sec  = buf[0];    time->week = buf[5];}/* 设定实时时间，时间结构体格式的设定时间转换为数组并写入DS1302 */void setRealTime(sTime_t * time) {    uint8_t buf[8];    buf[7] = 0;    buf[6] = time->year;    buf[5] = time->week;    buf[4] = time->mon;    buf[3] = time->day;    buf[2] = time->hour;    buf[1] = time->minute;    buf[0] = time->sec;    DS1302burstWrite(buf);}/* DS1302初始化，如发生掉电则重新设置初始时间 */void DS1302init() {    uint8_t dat;    sTime_t code InitTime[] = {  //2013年10月8日 12:30:00 星期二        0x2013, 0x10, 0x08, 0x12, 0x30, 0x00, 0x02    };    DS1302_CE = 0;  //初始化DS1302通信引脚    DS1302_SCLK = 0;    dat = DS1302singleRead(0);  //读取秒寄存器    if ((dat & 0x80) != 0) {   //由秒寄存器最高位CH的值判断DS1302是否已停止        DS1302singleWrite(7, 0x00);  //撤销写保护以允许写入数据        setRealTime(&InitTime);      //设置DS1302为默认的初始时间    }}

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