秒表按键控制问题，求大大

只看该作者 · 2017-11-9 16:35

#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit key1=P3^0;
sbit key2=P3^1;
sbit key3=P3^2;
sbit duan=P2^2;
sbit wei=P2^3;
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
uchar t,qian,bai,shi,ge,flag;
uint num;
void delay(uint);
void display(uchar qian,uchar bai,uchar shi,uchar ge);
void inittimer();
void main()
{
      inittimer();

      while(1)
      {
            if(key1==0)
            {
                     delay(3);
                     TR0=1;
                     while(!key1)
                              display(qian,bai,shi,ge);
            }
            if(key2==0)
            {
                     delay(3);
                     TR0=0;
                     while(!key2)
                              display(qian,bai,shi,ge);
            }
            if(key3==0)
            {
                     delay(3);
                     TR0=0;
                     num=0;
                     t=0;
                     TH0=(65536-1000)/256;
                     TL0=(65536-1000)%256;
                     TR0=1;
                     while(!key3)
                              display(qian,bai,shi,ge);
            }
            display(qian,bai,shi,ge);
      }
}
void delay(uint z)
{
      uint x,y;
      for(x=z;x>0;x--)
            for(y=125;y>0;y--);
}
void inittimer()
{
      num=0;
      TMOD=0x01;
      TH0=(65536-1000)/256;
      TL0=(65536-1000)%256;
      EA=1;
      ET0=1;
//       TR0=1;
}
void timer() interrupt 1
{
      TH0=(65536-1000)/256;
      TL0=(65536-1000)%256;
      t++;
      if(t==10)
      {
            t=0;
            num++;
            if(num==10000)
                     num=0;
            qian=num/1000;
            bai=num/100%10;
            shi=num%100/10;
            ge=num%100%10;
      }
}
void display(uchar qian,uchar bai,uchar shi,uchar ge)
{
      duan=1;
      P0=table[qian];
      duan=0;
      P0=0xff;
      wei=1;
      P0=0xef;
      wei=0;
      delay(3);

      duan=1;
      P0=table[bai]|0x80;
      duan=0;
      P0=0xff;
      wei=1;
      P0=0xdf;
      wei=0;
      delay(3);

      duan=1;
      P0=table[shi];
      duan=0;
      P0=0xff;
      wei=1;
      P0=0xbf;
      wei=0;
      delay(3);

      duan=1;
      P0=table[ge];
      duan=0;
      P0=0xff;
      wei=1;
      P0=0x7f;
      wei=0;
      delay(3);
}
当我按下KEY3时，秒表重置并自动开始计时，如何修改程序让它重置后按KEY2开始计时