灯为什不灭

只看该作者 · 2017-7-22 10:25

#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
#define led P0
sbit  key=P1^0;
unsigned int  i=0,num=0;
void Delayms(unsigned int c);
void init();
void key_Scan();


      void key_Scan()
      {
      if(!key)
      {
         Delayms(1);
               if(!key)
               {


                        while(!key)
                     {
                        P0=0x01;
                        i++;

                     }
                     }
                     }



      }



               void Delayms(unsigned int c)
{
unsigned char a, b;


while(c--)
{
            for (b=38;b>0;b--)
            {
                     for (a=130;a>0;a--);
            }

      }
}

      void main()
      {
      init();
      key=1;
      P0=0x00;
      while(1)

      {
                     key_Scan();

      }

      }
      void  init()
      {
         TMOD=0x01;
         TH0=(65536-45872)/256;
   TL0=(65536-45872)%256;
   EA=1;
   ET0=1;
   TR0=1;

      }

      void T_time() interrupt 1
      {

                  TH0=(65536-45872)/256;
         TL0=(65536-45872)%256;
                              num++;
            if(i==1&&num==20)
            {

               P0=0x00;}




               }