24.c

篮球比赛秒表程序,可以用于各种比赛的计时

#include<reg52.h>  //包含特殊功能寄存器库
sbit P34=P3^6;
unsigned char k,xshu,ge,shi;
unsigned int i;
unsigned char a[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
unsigned char b[3];
void delaym(unsigned int t) 		 // 延时子程序，入口参数ms,延迟时间=t*1ms,t=0~65535

{ 
unsigned char j;	       //j=0~255
while(t--)
{
for(j = 0; j < 125; j++);			//j进行的内部循环，1次延迟8us
}
}



void  main()
{
TMOD=0x01;
TH0=0xD8;
TL0=0xf0;
EA=1;
ET0=1;
//i=0;
//ge=0;
//shi=0;
TR0=1;
	while(1)
	{
		 for(k=0;k<3;k++)
		 {
		  P0=b[k];
		  P2=k;
		  delaym(3);
		 }
	}
}
time0_int(void)  interrupt 1   //中断服务程序
{
		TH0=0xD8;
		TL0=0xF0;
		i++;
		shi=i/1000;
		ge=i%1000/100;
		xshu=i%1000%100/10;
		 if(i==2400)
		 {i=0;
		  P34=0;
		 }
		 if(i==300)
		 {P34=1;}
		 b[2]=a[shi];
		 b[1]=a[ge]-0x80;
		 b[0]=a[xshu];
		
}