为什么我这程序下到板子上按下键盘数码管数字不断快速...

2019-07-16 04:32发布

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8条回答

1楼-- · 2019-07-16 08:19

#include <reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit LE1=P2^0;
sbit LE2=P2^1;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
uchar keyvalue,num,shi,ge;
void delayms(uint);
void display(uchar,uchar);
keyhadle();
keyscan()
{
  P3=0xff;
  if((P3&0xff)!=0xff)
  {
delayms(10);
if((P3&0xff)!=0xff)
{
   keyvalue=(P3&0xff);
}
  }
}
void main()
{
  while(1)
  {
   keyscan();
   delayms(10);
   keyhadle();
   delayms(10);
   display(shi,ge);
   delayms(10);
  }

}

void display(uchar shi,uchar ge)
{
  LE1=1;
  P1=0xfe;
  LE1=0;
  P1=0xff;
  delayms(30);
  LE2=1;
  P1=table[shi];
  LE2=0;


  LE1=1;
  P1=0xfd;
  LE1=0;
  P1=0xff;
  delayms(30);
  LE2=1;
  P1=table[ge];
  LE2=0;

}

keyhadle()
{
  switch (keyvalue)
  {
   case 0x7f:
      num--;
   shi=num/10;
   ge=num%10;
   return shi,ge;
   break;

   case 0xf7:
      num++;
   shi=num/10;
   ge=num%10;
   return shi,ge;
   break;
  }
  if(num==60)
   num=0;
}
void delayms(uint xms)
{
  uint i,j;
  for(i=xms;i>0;i--)
   for(j=110;j>0;j--);
}