51单片机电子闹钟代码

以下是51单片机电子闹钟的代码：

#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int

uchar code table[] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f};

uchar hour = 0, minute = 0, second = 0;uchar alarm_hour = 0, alarm_minute = 0;
bit alarm_flag = 0;

void delay(uint xms)
{
    uint i, j;
    for (i = xms; i > 0; i--)
        for (j = 110; j > 0; j--);
}

void display(uchar num)
{
    P2 = table[num];
}

void display_time()
{
    display(hour / 10);
    P1 = 0xfe;
    delay(5);
    display(hour % 10);
    P1 = 0xfd;
    delay(5);
    display(minute / 10);
    P1 = 0xfb;
    delay(5);
    display(minute % 10);
    P1 = 0xf7;
    delay(5);
}

void display_alarm()
{
    display(alarm_hour / 10);
    P1 = 0xfe;
    delay(5);
    display(alarm_hour % 10);
    P1 = 0xfd;
    delay(5);
    display(alarm_minute / 10);
    P1 = 0xfb;
    delay(5);
    display(alarm_minute % 10);
    P1 = 0xf7;
    delay(5);
}

void init()
{
    TMOD = 0x01;
    TH0 = 0x4c;
    TL0 = 0x00;
    TR0 = 1;
    ET0 = 1;
    EA = 1;
}

void main()
{
    init();
    while (1)
    {
        if (alarm_flag)
        {
            display_alarm();
        }
        else
        {
            display_time();
        }
    }
}

void time() interrupt 1
{
    TH0 = 0x4c;
    TL0 = 0x00;
    second++;
    if (second == 60)
    {
        second = 0;
        minute++;
        if (minute == 60)
        {
            minute = 0;
            hour++;
            if (hour == 24)
            {
                hour = 0;
            }
        }
    }
    if (hour == alarm_hour && minute == alarm_minute)
    {
        alarm_flag = 1;
    }
}