新手学习之单片机独立键盘问题

Learner_new · 发表于2011-11-24 19:30

新手学习之单片机独立键盘问题 [复制链接]

/*独立键盘检测装置,按下key1加1，按下key2减一，
按下key3清零，按下key4以定时器自减1，
再按key4数值停止自动减1，保持显示原数*/
#include <reg52.h>
#define uint unsigned int
#define uchar unsigned char

sbit key1=P0^0;
sbit key2=P0^1;
sbit key3=P0^2;
sbit key4=P0^3;

uchar num,t;
uchar code table[] = {0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,0x7f,0x6f};

void init()
{
TMOD=0x10;
TH1=0x3c;
TL1=0x0B0;
EA=1;
ET1=1;
}

void delay(uint z)
{
uint i,j;
for(i=z;i>0;i--)
  for(j=110;j>0;j--);
}
void main()
{
init();
P1=0x00;
delay(5);
while(1)
{
if(key1==0)
{
  delay(5);
  if(key1==0)
  {
   num++;
   if(num==10)
    num=0;
   while(!key1);
   delay(5);
   while(!key1);
  }
}
else if(key2==0)
{
     delay(5);
  if(key2==0)
  {
   if(num==0)
    num=10;
   num--;
   while(!key2);
   delay(5);
   while(!key2);
  }
}
else if(key3==0)
{
     delay(5);
  if(key3==0)
  {
   num=0;
   while(!key3);
  }
}
else if(key4==0)
{
     delay(5);
  if(key4==0)
  {
   delay(5);
   while(1)
   {
       TR1=1;
    if(t==20)
    {
     t=0;
     if(num==0)
        num=10;
     num--;
     P2=table[num];
     //while(!key4);
     if(key4==0)
     {
        break;
     }


    }