一个闹钟的单片机程序

一个闹钟的单片机程序。

其中蜂鸣器接P37，我的单片机数码管是四位共阳数码管，接P0和P2，K1接P14，K2接P15，K3接P16，K4接P17。晶振采用12MHz。STC89C52

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代码如下：

//File: Clock.c
#include
const unsigned char LED7Code[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
unsigned int hour,minute,second,cHour,cMinute;
bit isClick = 0;
unsigned char modify =0x00;//是否处于时间编辑状态
bit isClock =0;//是否开启闹钟

unsigned char timercount;
void timer0() interrupt 1
{
    TH0=(65536-50000)/256;
    TL0=(65536-50000)%256;
    timercount++;
    if(timercount==20)
    {
        timercount=0;
        second++;
        if(second==60)
        {
            minute++;
            second=0;
        }
        if(minute==60)
        {
            hour++;
            minute=0;
        }
        if(hour==24)
        {
            hour=0;
        }
    }  
}
//延迟
void Delay(unsigned int time)
{
    unsigned char a,b;
    for(a=0;a            for(b=0;b<120;b++);
}

//用于显示时间
void ShowTime(void)
{  
    unsigned int a,b, tempH,tempM;
    unsigned char showChar;
    if(modify==0x00 || modify ==0x01 || modify ==0x02)
    {
        tempH=hour;
        tempM=minute;
    }
    else
    {
        tempH=cHour;
        tempM=cMinute;
    }  
  
    if(modify==0x00 || modify ==0x01 || modify ==0x03)
    {
        //显示第4个数码管
        P0=0xFF;
        P2=0xFF;  
        a=tempH/10;
        showChar=LED7Code[a];
        P0=showChar;
        P2_3=0x00;
        Delay(1);//延迟很短
  
        //显示第3个数码管
        P0=0xFF;
        P2=0xFF;  
        b=tempH%10;
        showChar=LED7Code[b];
        P2_2=0x00;
        P0=showChar;
        Delay(1);//延迟很短
    }
  
    if(modify==0x00 || modify ==0x02 || modify ==0x04)
    {
        //显示第2个数码管
        P0=0xFF;
        P2=0xFF;  
        a=tempM/10;
        showChar=LED7Code[a];
        P0=showChar;
        P2_1=0x00;
        Delay(1);//延迟很短
  
        //显示第1个数码管
        P0=0xFF;
        P2=0xFF;  
        b=tempM%10;
        showChar=LED7Code[b];
        P2_0=0x00;
        P0=showChar;
        Delay(1);//延迟很短
    }
}

//蜂鸣器响
void Beep()   
{
   unsigned char i  ;
   for (i=0  ;i<100  ;i++)
   {
     Delay(100)  ;
     P3_7=!P3_7  ;   //Beep取反
   }
   P3_7=1  ;         //关闭蜂鸣器
   Delay(100);
  }

void main(void)
{
    unsigned int i;
    hour=12;
    minute=30;
    second=0;
    cHour=7;
    cMinute=0;
  
    TMOD=0x01;
    ET0=0x01;//定时器T0可以中断
    EA=0x01;//表示允许所有的中断
    TR0=0x01;//开始T0计时
  
    while(1)
    {
        if(P1_4==0x00)//按下了K1键，增加小时或分钟
        {
            if(!isClick)
            {
                switch(modify)
                {
                    case 0x01://调整小时
                        hour++;
                        if(hour==24)
                            hour=0;
                        break;
                    case 0x02://调整分钟
                        minute++;
                        if(minute==60)
                            minute=0;
                        break;
                    case 0x03://调整闹钟的小时
                        cHour++;
                        if(cHour==24)
                            cHour=0;
                        break;
                    case 0x04://调整闹钟的分钟
                        cMinute++;
                        if(cMinute==60)
                            cMinute=0;
                        break;  
                    default:
                        break;
                }
                isClick=1;  
            }
        }
        else if(P1_5==0x00)//按下了K2键，减少小时或分钟
        {
            if(!isClick)
            {
                switch(modify)
                {
                    case 0x01://调整时间的小时                      
                        if(hour==0)
                            hour=23;
                        else
                            hour--;
                        break;
                    case 0x02://调整时间的分钟                      
                        if(minute==0)
                            minute=59;
                        else
                            minute--;
                        break;
                  case 0x03://调整闹钟的小时                      
                        if(cHour==0)
                            cHour=23;
                        else
                            cHour--;
                        break;
                    case 0x04://调整闹钟的分钟                      
                        if(cMinute==0)
                            cMinute=59;
                        else
                            cMinute--;
                        break;
                    default:
                        break;
                }
                isClick=1;  
            }
        }
        else if(P1_6==0x00)//按下了K3键，更改模式，第一次修改小时，第二次修改分钟，第三次恢复
        {
            if(!isClick)
            {
                switch(modify)
                {
                    case 0x00://不是修改状态,调整小时                  
                        modify=0x01;
                        break;
                    case 0x01://调整分钟                  
                        modify=0x02;
                        break;
                    case 0x02://调整闹钟的小时      
                        modify=0x03;
                        break;
                    case 0x03://调整闹钟的分钟      
                        modify=0x04;
                        break;
                    case 0x04://不修改      
                        modify=0x00;
                        break;              
                    default:
                        break;
                }
                isClick=1;  
            }
        }
        else if(P1_7==0x00)//按下了K4键，开启或关闭闹钟
        {
            if(!isClick)
            {
                isClock=~isClock;
                isClick=1;  
            }
        }
        else
            isClick=0;
      
        //闹钟是否响了
        if(isClock)
        {
            if(hour==cHour && minute == cMinute)
            {
                Beep();//响
            }
        }
        ShowTime();          
    }  
}