独立按键

#include "reg52.h"
typedef unsigned int u16;

sbit k1 = P3^1;  //定义P31口是k1
sbit led = P2^0;   //定义P20口是led

void main(){  
  while(1){ 
    if(k1 == 0){  
      led = 0;
    }
    else{
      led = 1;
    }
  }   
}