remote.c

NEC遥控器解码实验

#include <AT89X52.H>
#define uchar unsigned char
sbit check=P2^2;
sbit beep=P2^1;
uchar irdata[2],irtype,ircount;
uchar code table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xbf};
bit endflag;
void init()
{
irdata[0]=0;
irdata[1]=0;

irtype=0;
ircount=0;
endflag=0;
check=1;
P3=0xfe;
}
 void delay_50ms(unsigned int t)
{
 unsigned int j;   
 for(;t>0;t--) 
       for(j=6245;j>0;j--) 
{;}
}

void tim0() interrupt 1 using 0
{
bit in=~check;
TH0=(65536-1688)/256;
TL0=(65536-1688)%256;
irdata[irtype]=irdata[irtype]|in;
ircount++;
if(ircount==3)
{
irtype=1;
}
else if(ircount==12)
{
irtype=2;
}

else if(irtype==2)
 {
  endflag=1;
  ircount=0;
  irtype=0;
  TR0=0;
  return;
  }
  else
{

 irdata[irtype]=irdata[irtype]<<1;
  }
   }
void delay()
 {
  uchar a,b;
  for(a=20;a!=0;a--)
  for(b=248;b!=0;b--);
  }
void display()
 {
  uchar i;
  switch(irdata[1])
 {
  case 0x20:i=0;break;
  case 0x10:i=1;break;
  case 0x08:i=2;break;
  case 0x04:i=3;break;
  case 0x02:i=4;break;
  case 0x01:i=5;break;
  case 0xa0:i=6;break;
  case 0x90:i=7;break;
  case 0x88:i=8;break;
  case 0x82:i=9;break;

  }
   P0=table[i];
   delay();
   }
void main()
{
 TMOD=0x81;
 IE=0x82;
 P0=table[0];
 check=1;
 while(1)
 {
  init();
  TH0=(65536-844)/256;
  TL0=(65536-844)%256;
  while(check);
  TR0=1;
  while(!endflag);
  display();
  beep=0;
  delay_50ms(1);
  beep=1;
  }
   }