键龄.c

键龄的单片机C程序

#include<regX51.h>
unsigned long i=0;
bit j;                        
void sw1()interrupt 2 using 2
{                                           
 j=1;                                       
}                                                     

void read()
{
 bit a;
 P3_3=1;
 a=P3_3;
 if(j&&(!a))
 {
  if(i<0x4AFF)
  i++;
  else
  i=0x4AFF;
 }
 else
 j=0;
}

void test()
{ 
 bit a;
 P3_3=1;
 a=P3_3;
 if(a&&(!j))
 {
  if((i<0x2AFF)&&(i>=0x1AFF))
  {P1_0=0;P0_4=1;i=0;}
  else if((i<=0x4AFF)&&(i>=0x2AFF))
  {P1_0=1;P0_4=0;i=0;}
 }
}                                                                                                           
void main()                                                                       
{
 EA=1;
 EX1=1;
 IT1=1;
 while(1)
 {
  read();
  test();
 }
}