#define LED_ON          RA1_bit = 1        //Turn ON LED pin RA1
#define LED_OFF         RA1_bit = 0        //Turn OFF LED pin RA1

#define ON_OFF          0x1B                //Code transmitted when press RB1
#define VOLUME_UP       0x87                //Code transmitted when press RB2
#define VOLUME_DOWN     0x9C                 //Code transmitted when press RB3
#define MUTE            0x2D                //Code transmitted when press RB4
#define CHANNELS_6      0x2E                 //Code transmitted when press RB5
#define CHANNELS_4      0x3E               //Code transmitted when press RB6
#define CHANNELS_2      0x4E              //Code transmitted when press RB7

void Flash (unsigned char N);
void noFlash(unsigned char N);
void Octet (unsigned char B);

main()
{
        //Oscillator
        OSCCON  = 0b11101001; //4Mhz
        //PORTA
        PORTA   = 0b00000000;
        TRISA   = 0b00000000; //outputs
        ANSELA  = 0b00000000; //RA0-RA7 digital
        WPUA    = 0b00000000; //No WPU
        //PORTB
        PORTB   = 0b11111111;
        TRISB   = 0b11111111; //inputs
        ANSELB  = 0b00000000; //RA0-RA7 digital
        WPUB    = 0b11111111; //Weak pull-up enable
        //Peripherals
        CM1CON0 = 0; //Comparator 1 disabled
        CM2CON0 = 0; //Comparator 1 disabled
        CM2CON0 = 0; //Comparator 2 disabled
        CM2CON1 = 0; //Comparator 2 disabled
        INTCON  = 0b00001000; //Interrupt control register
        IOCBP         = 0b00000000;
        IOCBN   = 0b11111111;
        IOCBF   = 0b00000000;

  while(1)
  {
        delay_ms(10);
        if(PORTB==0xff)
        {
                IOCBF = 0;
                delay_ms(10);
                asm{
                sleep
                nop
                }
        }
        delay_ms(10);
        switch (~PORTB)
        {
                case 0b00000010:
                {
                        Octet (ON_OFF);
                        Octet (ON_OFF);
                        Octet (ON_OFF);
                        while(RB1_bit==0);
                        delay_ms(10);
                        break;
                }
                case 0b00000100:
                {
                        while(RB2_bit==0)
                        {
                                Octet (VOLUME_UP);
                                Octet (VOLUME_UP);
                                Octet (VOLUME_UP);
				delay_ms(100);
                        }
                        break;
                }
                case 0b00001000:
                {
                        while (RB3_bit==0)
                        {
                                Octet (VOLUME_DOWN);
                                Octet (VOLUME_DOWN);
                                Octet (VOLUME_DOWN);
				delay_ms(100);
                        }
                        break;
                }
                case 0b00010000:
                {
                        
                        Octet (MUTE);
                        Octet (MUTE);
                        Octet (MUTE);
                        while(RB4_bit==0);
                        delay_ms(10);
                        break;
                }
                case 0b10000000:
                {
                        
                        Octet (CHANNELS_2);
                        Octet (CHANNELS_2);
                        Octet (CHANNELS_2);
                        while(RB7_bit==0);
                        delay_ms(10);
                        break;
                }
                case 0b01000000:
                {
                        
                        Octet (CHANNELS_4);
                        Octet (CHANNELS_4);
                        Octet (CHANNELS_4);
                        while(RB6_bit==0);
                        delay_ms(10);
                        break;
                }
                case 0b00100000:
                {
                        
                        Octet (CHANNELS_6);
                        Octet (CHANNELS_6);
                        Octet (CHANNELS_6);
                        while(RB5_bit==0);
                        delay_ms(10);
                        break;
                }
                default:
                {
                        delay_ms(10);
                        break;
                }
        }
        delay_ms(10);
  }
}
        
void Flash(unsigned char N)
{
        while (N > 0)
        {
                LED_ON;
                delay_us(12);
                LED_OFF;
                delay_us(6);
                N -= 0x01;
         }
}
void noFlash(unsigned char N)
{
        while (N > 0)
        {
                LED_OFF;
                delay_us(12);
                LED_OFF;
                delay_us(6);
                N -= 0x01;
         }
}
void Octet (unsigned char B)
{
        unsigned char numbit;
        Flash(0x1E);                                         //Start bit
        for (numbit = 0; numbit < 0x08; numbit++)        //Data bits
        {
                if ((B & 0x01) == 0x01)
                {
                        noFlash(0x1E);
                }
                else
                {
                        Flash(0x1E);
                }
                B = B >> 1;
        }
        noFlash(0x1E);                                        //Stop bits
        noFlash(0x1E);
}