#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
unsigned char code smg_du[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};
unsigned char code smg_we[]={0x08,0x18,0x28,0x38,0x48,0x58,0x68,0x78};
uchar irtime;
uchar startflag;
uchar irdata[33];
uchar bitnum;
uchar irreceok;
uchar ircode[4];
uchar irprosok;
uchar disp[8];
//************************************************
//延時函數，在12MHz的晶振頻率下
//大約50us的延時
//************************************************
void delay_50us(uint t)
{
 uchar j;
 for(;t>0;t--)
        for(j=19;j>0;j--);
}
//************************************************
//延時函數，在12MHz的晶振頻率下
//大約50ms的延時
//************************************************
void delay_50ms(uint t)
{
 uint j;
 for(;t>0;t--)
 for(j=6245;j>0;j--);
}
void timer0init(void)
{
 TMOD=0x02;
 TH0=0x00;
 TL0=0x00;
 ET0=1;
 EA=1;
 TR0=1;
}
void int0init(void)
{
 IT0=1;
 EX0=1;
 EA=1;
}
void irwork(void)
{
 disp[0]=ircode[0]/16;
 disp[1]=ircode[0]%16;
 disp[2]=ircode[1]/16;
 disp[3]=ircode[1]%16;
 disp[4]=ircode[2]/16;
 disp[5]=ircode[2]%16;
 disp[6]=ircode[3]/16;
 disp[7]=ircode[3]%16;
  
}
void display(void)
{
 uchar i;
 for(i=0;i<8;i++)
 {
  P1=smg_du[disp[i]];
  P2=smg_we[i];
  delay_50us(20);
 }
}
void irpros(void)  //0x1c
{
 uchar k,i,j;
 uchar value;
 k=1;
 for(j=0;j<4;j++)
 {
  for(i=0;i<8;i++)
  {
   value=value>>1;   //7
   if(irdata[k]>6)   //8
   {
    value=value | 0x80;
   }
   k++;
  }
  ircode[j]=value;
 }
 irprosok=1;
}
void main()
{
 timer0init();
 int0init();
 while(1)
 {
  if(irreceok)
  {
   irpros();
   irreceok=0;
  }
  if(irprosok)
  {
   irwork();
   irprosok=0;
  }
  display();
  
 }
 
 
}
void timer0 () interrupt 1
{
 irtime++; //255
}
void int0 () interrupt 0
{
 if(startflag)
 {
  if(irtime>32) //檢測引導碼
  {
    bitnum=0;
  }
  irdata[bitnum]=irtime;
  irtime=0;
  bitnum++;
  if(bitnum==33)
  {
   bitnum=0;
   irreceok=1;
  }
 }
 else
 {
  startflag=1;
  irtime=0;
 }
}

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