51单片机篮球24秒计时器.docx

利用动态数码管模块、蜂鸣器以及按键实现篮球24秒计时器的功能，模拟现实中篮球比赛时的计时功能，动态数码管来显示倒计时的数字供大家观看时间，蜂鸣器在计时结束后发出响声提示大家时间到。

smgduan[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};u8secc=0,sec=24,min;u8DisplayData[8];sbitbeep=P1^5;voiddelay(u16 i){while(i--);  }voiddatapros(){DisplayData[0]=smgduan[sec/10];DisplayData[1]=smgduan[sec%10];}voidDigDisplay(){u8 i;for(i=0;i<5;i ){    switch(i)    {      case(0):           LSA=1;LSB=1;LSC=1; break;        case(1):           LSA=0;LSB=1;LSC=1; break;    }    P0=DisplayData[i];    delay(100);      P0=0x00;}}voidkeypros(){if(k1==0){    delay(1000);    if(k1==0){        int flag=0;        while(1){           if(k3==0){               delay(1000);               if(k3==0){                  sec=24;               }               while(!k3);           }           if(k2==0){               delay(1000);               if(k2==0){                  TR0=!TR0;                  flag=~flag;               }               while(!k2);           }           datapros();           DigDisplay();           if(TR0==0&&flag==0){               break;           }        }    }    while(!k1);}}voidTimer0Init(){TMOD|=0X01; TH0=0Xd8;TL0=0Xf0;ET0=1;EA=1;TR0=1;}voidmain(){  while(1){      Timer0Init();    keypros();}     }voidBeep(){int i=200000;while(i--){    beep=~beep;    delay(100);}}