51单片机，AT89S52芯片 阅读DS1302的数据手册，学会DS1302的读写操作 1.单字节写 2.单字节读 3.write in burst modle (CLOCK) 4.read in burst modle (CLOCK) 将上述功能写成函数(模块化设计，代码封装） 编写主程序验证上述功能函数 将2023年5月22号星期-18点30分00秒写到DS1302， 随后读取DS1302的日期时间1，并在数码管上进行显示 显示效果： 显示日期（年、月 日）几秒，随后显示时间（时、分、秒）秒在跳动，不断循环 ​

以下是51单片机，AT89S52芯片DS1302的读写操作的代码封装：

#include <reg52.h>
#include "ds1302.h"

// DS1302写单字节数据
void ds1302_write_byte(unsigned char addr, unsigned char dat)
{
    unsigned char i;

    ds1302_rst = 0;
    ds1302_clk = 0;

    ds1302_rst = 1;
    ds1302_write_byte_1(addr);

    for (i = 0; i < 8; i++)
    {
        ds1302_io = dat & 0x01;
        dat >>= 1;
        ds1302_clk = 1;
        ds1302_clk = 0;
    }

    ds1302_rst = 0;
}

// DS1302读单字节数据
unsigned char ds1302_read_byte(unsigned char addr)
{
    unsigned char i, dat = 0;

    ds1302_rst = 0;
    ds1302_clk = 0;

    ds1302_rst = 1;
    ds1302_write_byte_1(addr | 0x01);

    for (i = 0; i < 8; i++)
    {
        dat >>= 1;
        if (ds1302_io)
            dat |= 0x80;

        ds1302_clk = 1;
        ds1302_clk = 0;
    }

    ds1302_rst = 0;

    return dat;
}

// DS1302写多字节数据
void ds1302_write_burst(unsigned char *dat)
{
    unsigned char i;

    ds1302_rst = 0;
    ds1302_clk = 0;

    ds1302_rst = 1;
    ds1302_write_byte_1(DS1302_WRITE_BURST);

    for (i = 0; i < 8; i++)
    {
        ds1302_io = *dat & 0x01;
        *dat >>= 1;
        ds1302_clk = 1;
        ds1302_clk = 0;
    }

    ds1302_rst = 0;
}

// DS1302读多字节数据
void ds1302_read_burst(unsigned char *dat)
{
    unsigned char i;

    ds1302_rst = 0;
    ds1302_clk = 0;

    ds1302_rst = 1;
    ds1302_write_byte_1(DS1302_READ_BURST);

    for (i = 0; i < 8; i++)
    {
        dat[i] = 0;
        if (ds1302_io)
            dat[i] |= 0x80;

        ds1302_clk = 1;
        ds1302_clk = 0;
    }

    ds1302_rst = 0;
}

// 设置DS1302的时间
void ds1302_set_time(unsigned char year, unsigned char month, unsigned char date, unsigned char week, unsigned char hour, unsigned char minute, unsigned char second)
{
    ds1302_write_byte(DS1302_CONTROL, 0x80); // 关闭写保护

    ds1302_write_byte(DS1302_YEAR, year);
    ds1302_write_byte(DS1302_MONTH, month);
    ds1302_write_byte(DS1302_DATE, date);
    ds1302_write_byte(DS1302_WEEK, week);
    ds1302_write_byte(DS1302_HOUR, hour);
    ds1302_write_byte(DS1302_MINUTE, minute);
    ds1302_write_byte(DS1302_SECOND, second);

    ds1302_write_byte(DS1302_CONTROL, 0x00); // 打开写保护
}

// 从DS1302读取时间
void ds1302_get_time(unsigned char *year, unsigned char *month, unsigned char *date, unsigned char *week, unsigned char *hour, unsigned char *minute, unsigned char *second)
{
    unsigned char dat[8];

    ds1302_read_burst(dat);

    *year = dat[6];
    *month = dat[4];
    *date = dat[3];
    *week = dat[2];
    *hour = dat[1];
    *minute = dat[0];
    *second = dat[7];
}

下面是主程序：

#include <reg52.h>
#include "ds1302.h"

#define uchar unsigned char
#define uint unsigned int

// 数码管共阴极的段码
uchar code smgduan[] = {
    0x3f, // '0'
    0x06, // '1'
    0x5b, // '2'
    0x4f, // '3'
    0x66, // '4'
    0x6d, // '5'
    0x7d, // '6'
    0x07, // '7'
    0x7f, // '8'
    0x6f, // '9'
    0x77, // 'A'
    0x7c, // 'b'
    0x39, // 'C'
    0x5e, // 'd'
    0x79, // 'E'
    0x71, // 'F'
};

// 数码管位选，从左到右依次为P2.0~P2.7
uchar code smgwei[] = {
    0xfe, 0xfd, 0xfb, 0xf7,
    0xef, 0xdf, 0xbf, 0x7f,
};

// 延时函数
void delay(uint x)
{
    uint i, j;
    for (i = x; i > 0; i--)
        for (j = 110; j > 0; j--);
}

// 在数码管上显示日期时间
void display_datetime(unsigned char year, unsigned char month, unsigned char date, unsigned char hour, unsigned char minute, unsigned char second)
{
    uchar i, j;
    uchar smg[8];

    // 显示日期
    smg[0] = smgduan[year / 10];
    smg[1] = smgduan[year % 10];
    smg[2] = smgduan[month / 10];
    smg[3] = smgduan[month % 10];
    smg[4] = smgduan[date / 10];
    smg[5] = smgduan[date % 10];
    smg[6] = smgduan[16]; // '-'
    smg[7] = smgduan[second % 10];

    for (i = 0; i < 8; i++)
    {
        for (j = 0; j < 8; j++)
        {
            P0 = smg[j];
            P2 = smgwei[i];
            delay(1);
            P0 = 0x00;
        }
    }

    // 显示时间
    smg[0] = smgduan[hour / 10];
    smg[1] = smgduan[hour % 10];
    smg[2] = smgduan[minute / 10];
    smg[3] = smgduan[minute % 10];
    smg[4] = smgduan[second / 10];
    smg[5] = smgduan[16]; // '-'
    smg[6] = smgduan[16]; // '-'
    smg[7] = smgduan[16]; // '-'

    while (1)
    {
        for (i = 0; i < 8; i++)
        {
            for (j = 0; j < 8; j++)
            {
                P0 = smg[j];
                P2 = smgwei[i];
                delay(1);
                P0 = 0x00;
            }
        }
    }
}

void main()
{
    unsigned char year = 23, month = 5, date = 22, week = 2, hour = 18, minute = 30, second = 0;

    ds1302_init(); // 初始化DS1302
    ds1302_set_time(year, month, date, week, hour, minute, second); // 设置DS1302的时间

    while (1)
    {
        ds1302_get_time(&year, &month, &date, &week, &hour, &minute, &second); // 从DS1302读取时间
        display_datetime(year, month, date, hour, minute, second); // 在数码管上显示日期时间
    }
}

在主程序中设置了初始时间为2023年5月22日星期二18点30分00秒，然后不断从DS1302读取当前时间并在数码管上显示。