51定时器计数显示数字是乱的

ID:154519 · 发表于 2016-12-13 21:06

10ms精确度，0-999计数，按键暂停，松开计数。为什么显示数字是乱的。请指教

#include<reg52.h>

#define uchar unsigned char
#define uint unsigned int

uchar code table[]=
{0x00,0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71,};

uchar num;

sbit dula=P2^6;
sbit wela=P2^7;

uchar keyscr();

void delay(uint z)
{
      uint x,y;
      for(x=0;x<z;x++)
            for(y=0;y<110;y++);
}

void display(uchar shu)
{
      uchar bai,shi,ge;
      bai=shu/100;
      shi=shu%100/10;
      ge=shu%100%10;

      dula=1;
      P0=table[bai];
      dula=0;
      P0=0xff;
      wela=1;
      P0=0xfe;
      wela=0;
      delay(1);

      dula=1;
      P0=table[shi];
      dula=0;
      P0=0xff;
      wela=1;
      P0=0xfd;
      wela=0;
      delay(1);

      dula=1;
      P0=table[ge];
      dula=0;
      P0=0xff;
      wela=1;
      P0=0xfb;
      wela=0;
      delay(1);
}

void init()
{
      EA=1;
      ET0=1;
      TMOD=0X01;
      TH0=(65536-9174)/256;
      TL0=(65536-9174)%256;
      TR0=1;
}

void main()
{
      init();
      while(1)
      {
            if(keyscr()==0)
            {
                     TR0=1;
                     display(num);
            }
            else
            {
                     TR0=0;
                     display(num);
            }
      }
}

void timer() interrupt 1
{
      TH0=(65536-9174)/256;
      TL0=(65536-9174)%256;
      num++;
      if(num==1000)
            num=0;
}

uchar keyscr()
{
      uchar temp;
      uchar flag=0;
      temp=P3;
      temp=temp&0xf0;
      if(temp==0xf0)
            flag=0;
      else
            flag=1;
      return flag;
}