[remon romany]

ارجو شرح هذا الكود لو سمحتو
هذا الكود كود استقبال الاشعة ما تحت الحمراء
وانا عاوز شرحة لو سمحتو

sbit ir_in at RA0_bit;                      // Infrared receiver input
sbit ir_in_direction at TRISA0_bit;         // Infrared receiver input
unsigned int retint;                        // general purpose integer
unsigned char ir_byte,COUNT,bouton;
unsigned char ir_result[3];
void interrupt()
{
     count++;
     intcon=0b00100000;
     TMR0=0;
}
unsigned int get_mark(){
      TMR0= 0; count=0;
      for(;!ir_in;){}
      retint=2*(TMR0+(count*256));
      return retint;
}

unsigned int get_space(){
      TMR0= 0; count=0;
      for(;ir_in;){}
      retint=2*(TMR0+(count*256));
      return retint;
}
unsigned char get_sony_byte(char nbits){
char n;
unsigned char ir_byte;
unsigned int temp_ir;

    ir_byte = 0;                                  // initialise
    for(n=0 ; n<nbits ; n++){
        temp_ir = get_space();                    // expect ~510uS
        temp_ir = get_mark();
          ir_byte >>= 1;                   // 650uS = 0, 1.2uS = 1
        if ((temp_ir > 1000)&&(temp_ir < 1300)) {
            ir_byte += 0x80;
        }
    }
    ir_byte >>= 8-nbits;
    return ir_byte;
}
void sony_read(){
unsigned int temp_ir;

    ir_result[0] = 0;                            // return 0, 0 if glitch
    ir_result[1] = 0;                            // return 0, 0 if glitch
    while(ir_in);                                // wait for IR to go low
    temp_ir = get_mark();
    if((temp_ir>2000)&&(temp_ir<3000)) {     // expect 2.4mS mark
        ir_result[0] = get_sony_byte(7);          // 7 bit command
        ir_result[1] = get_sony_byte(5);         // 5 bit address
        Delay_ms(10);                           // wait for repeat messages to clear

    }
}
void main() {
    TRISA=0x0F;
    TRISB=0;
    PORTB=0;
    PORTA=0;
    cmcon=7;
    option_reg=0b10000000;
    intcon=0b10100000;
    TMR0 = 0;
    while(1){
        sony_read();
        if(ir_result[1]==1){                 // Sony address 01 is TV
            bouton = ir_result[0];
            switch (bouton){
                case 0: Portb.F0 = ~Portb.F0;Delay_ms(150);break;        // button TV '0'
                case 1: Portb.F1 = ~Portb.F1;Delay_ms(150);break;        // button TV '1'
                case 2: Portb.F2 = ~Portb.F2;Delay_ms(150);break;        // button TV '2'
                case 3: Portb.F3 = ~Portb.F3;Delay_ms(150);break;        // button TV '3'
                default:break;
            }
        }
    }
    while(1);              // loop forever