写一个基于stc89c52单片机和DS1302芯片的定时闹钟代码

以下是一个基于STC89C52单片机和DS1302实时时钟芯片的定时闹钟代码。该代码使用了DS1302的定时器功能，可以设置多组闹钟时间，每次闹钟触发后会发出一声蜂鸣器声音。

#include <reg52.h>
#include <intrins.h>

#define uchar unsigned char
#define uint unsigned int

sbit DIO = P1^0;
sbit SCLK = P1^1;
sbit RST = P1^2;
sbit beep = P2^3;

uchar code table[] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f}; // 数码管显示数字表

uchar time_buf[7] = {0x00, 0x26, 0x17, 0x01, 0x03, 0x01, 0x21}; // 初始时间 2021年01月03日 星期日 01:26:00
uchar alarm1_buf[4] = {0x08, 0x00, 0x00, 0x80}; // 闹钟1 时间 08:00 触发蜂鸣器
uchar alarm2_buf[4] = {0x18, 0x00, 0x00, 0x80}; // 闹钟2 时间 18:00 触发蜂鸣器

void delay(uint i) // 延时函数
{
    while(i--);
}

void write_ds1302_byte(uchar dat) // 向DS1302写入一个字节
{
    uchar i;
    
    for(i=0; i<8; i++)
    {
        SCLK = 0;
        DIO = dat & 0x01;
        dat >>= 1;
        SCLK = 1;
    }
}

uchar read_ds1302_byte() // 从DS1302读取一个字节
{
    uchar i, dat = 0;
    
    for(i=0; i<8; i++)
    {
        SCLK = 0;
        dat >>= 1;
        if(DIO)
            dat |= 0x80;
        SCLK = 1;
    }
    
    return dat;
}

void write_ds1302(uchar addr, uchar dat) // 向DS1302写入一个寄存器
{
    RST = 0;
    SCLK = 0;
    RST = 1;
    write_ds1302_byte(addr);
    write_ds1302_byte(dat);
    RST = 0;
}

uchar read_ds1302(uchar addr) // 从DS1302读取一个寄存器
{
    uchar dat;
    
    RST = 0;
    SCLK = 0;
    RST = 1;
    write_ds1302_byte(addr);
    dat = read_ds1302_byte();
    RST = 0;
    
    return dat;
}

void set_ds1302_time(uchar *time_buf) // 设置DS1302的时间
{
    write_ds1302(0x8e, 0x00);
    write_ds1302(0x80, time_buf[0]);
    write_ds1302(0x82, time_buf[1]);
    write_ds1302(0x84, time_buf[2]);
    write_ds1302(0x86, time_buf[3]);
    write_ds1302(0x88, time_buf[4]);
    write_ds1302(0x8a, time_buf[5]);
    write_ds1302(0x8c, time_buf[6]);
    write_ds1302(0x8e, 0x80);
}

void get_ds1302_time(uchar *time_buf) // 读取DS1302的时间
{
    time_buf[0] = read_ds1302(0x81);
    time_buf[1] = read_ds1302(0x83);
    time_buf[2] = read_ds1302(0x85);
    time_buf[3] = read_ds1302(0x87);
    time_buf[4] = read_ds1302(0x89);
    time_buf[5] = read_ds1302(0x8b);
    time_buf[6] = read_ds1302(0x8d);
}

void set_ds1302_alarm(uchar *alarm_buf) // 设置DS1302的闹钟
{
    write_ds1302(0x8e, 0x00);
    write_ds1302(0x90, alarm_buf[0]);
    write_ds1302(0x92, alarm_buf[1]);
    write_ds1302(0x94, alarm_buf[2]);
    write_ds1302(0x96, alarm_buf[3]);
    write_ds1302(0x8e, 0x80);
}

void ds1302_init() // 初始化DS1302
{
    write_ds1302(0x8e, 0x00);
    write_ds1302(0x80, 0x00);
    write_ds1302(0x81, 0x00);
    write_ds1302(0x82, 0x26);
    write_ds1302(0x83, 0x17);
    write_ds1302(0x84, 0x01);
    write_ds1302(0x85, 0x03);
    write_ds1302(0x86, 0x01);
    write_ds1302(0x87, 0x21);
    write_ds1302(0x88, 0x00);
    write_ds1302(0x89, 0x00);
    write_ds1302(0x8a, 0x00);
    write_ds1302(0x8b, 0x00);
    write_ds1302(0x8c, 0x00);
    write_ds1302(0x8d, 0x00);
    write_ds1302(0x8e, 0x80);
    set_ds1302_alarm(alarm1_buf);
    set_ds1302_alarm(alarm2_buf);
}

uchar dec_to_bcd(uchar dat) // 十进制转化为BCD码
{
    uchar bcd;
    
    bcd = dat / 10 << 4;
    bcd |= dat % 10;
    
    return bcd;
}

void display_num(uchar num) // 数码管显示数字
{
    P0 = table[num];
}

void display_time(uchar *time_buf) // 数码管显示时间
{
    display_num(time_buf[2] >> 4);
    delay(1000);
    display_num(time_buf[2] & 0x0f);
    delay(1000);
    display_num(10);
    delay(1000);
    display_num(time_buf[1] >> 4);
    delay(1000);
    display_num(time_buf[1] & 0x0f);
    delay(1000);
    display_num(10);
    delay(1000);
    display_num(time_buf[0] >> 4);
    delay(1000);
    display_num(time_buf[0] & 0x0f);
    delay(1000);
}

void main() // 主函数
{
    uchar i;
    
    ds1302_init();
    
    while(1)
    {
        get_ds1302_time(time_buf);
        display_time(time_buf);
        
        for(i=0; i<4; i++)
        {
            if(time_buf[i+1] == alarm1_buf[i] && time_buf[0] == 0x08 && time_buf[6] != 0x01)
            {
                beep = 1;
                delay(1000);
                beep = 0;
            }
            if(time_buf[i+1] == alarm2_buf[i] && time_buf[0] == 0x18 && time_buf[6] != 0x01)
            {
                beep = 1;
                delay(1000);
                beep = 0;
            }
        }
    }
}

该代码使用了DS1302的定时器功能，可以设置多组闹钟时间，每次闹钟触发后会发出一声蜂鸣器声音。代码中的`time_buf`数组保存了当前时间，`alarm1_buf`和`alarm2_buf`数组分别保存了两组闹钟时间。在`while`循环中，先读取当前时间并通过数码管显示出来，然后判断是否触发了闹钟，如果触发了就发出蜂鸣器声音。