單片機搶答器源程序

ID:297382 · 發(fā)表于 2020-9-9 08:42

#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
uchar code1[]={~0x3F,~0x06,~0x5B,~0x4F,~0x66,~0x6D,~0x7D,~0x07,~0x7F};
sbit key1=P1^0;
sbit key2=P1^1;
sbit key3=P1^2;

void delay(uint t)
{
uint j;
for(;t>0;t--)
for(j=19;j>0;j--);
}
void display(uchar i)
{
switch(i)
{
  case 0:P2=code1[0];break;
  case 1:P2=code1[1];break;
  case 2:P2=code1[2];break;
}
}

void key()
{
uchar i;
if(key1==1)
{
  delay(10);
  if(key1==1)
  {
delay(10);
i=0;
display(i);
  }
}
  while(key1!=1);
  delay(10);
  if(key2==1)
{
  delay(10);
  if(key2==1)
  {
delay(10);
i=1;
display(i);
  }
}
  while(key2!=1);
  delay(10);
  if(key3==1)
{
  delay(10);
  if(key3==1)
  {
delay(10);
i=2;
display(i);
  }
}
  while(key3!=1);
  delay(10);
  while(1);
}
void main()
{
while(1)
{
  key();
}
}

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