74HC165读按键

#include <reg52.H>
 #include <intrins.h>

 #define NOP() _nop_()
 #define _Nop() _nop_()


sbit CLK = P3^6;
sbit IN_PL = P1^6; //74HC165 shift load 把数据加载到锁存器中

sbit IN_Dat = P1^7; //74HC165 output 数据通过P3.5脚移进单片机内处理

sbit RELAY = P1^4;
sbit BEEP = P1^5;

 
unsigned long ReHC74165(void); //函数声名

unsigned char bdata Key;
 unsigned int Output;
sbit K0=Key^0;
sbit K1=Key^1;
sbit K2=Key^2;
sbit K3=Key^3;
sbit K4=Key^4;
sbit K5=Key^5;
sbit K6=Key^6;
sbit K7=Key^7;

bit K0J,K1J,K2J,K3J; //位定义


bit M0,M1,M2,M3; //位定义


 main()
  {
    //M0=M1=M2=M3=0;

  while(1)
  {
    unsigned long Input=ReHC74165();
  Key=Input&0xff;

   //实现脉冲输入

    if(K0&K0J)M0=~M0;
    K0J=~K0;
    if(K1&K1J)M1=~M1;
    K1J=~K1;
 if(K2&K2J)M2=~M2;
    K2J=~K2;
 if(K3&K3J)M3=~M3;
    K3J=~K3;

         RELAY = 1;
      BEEP = 1;

     if(M0) RELAY = 0;
     if(M1) BEEP = 0;
  
     P2 = K0;
  
   }
  
 }


 
 



unsigned long ReHC74165(void)
{
  unsigned char i;
  unsigned long indata;
  
   IN_PL=0;
   NOP();
   IN_PL=1;
   NOP();
             
   indata=0;
   for(i=0; i<8; i++)
    {
   indata=indata<<1;
      if(IN_Dat==1)indata=indata+1;
   CLK=1;
      NOP();
      CLK=0;
 }
  
   return(~indata);
 
}