#define LED_ON          PORTB |= 0b00000001
#define BUTTON_ON       PORTB |= 0b11100000
#define ON_OFF          0x1B        //Kod prijaty pri stlaceni ON/OFF
#define MUTE            0x2D        //2D Kod prijaty pri stlaceni Mute
#define CHANNELS_2      0x4E        //Kod prijaty pri stlaceni 2ch Channels
#define CHANNELS_4      0x3E        //Kod prijaty pri stlaceni 4ch Channels
#define CHANNELS_6      0x2E        //Kod prijaty pri stlaceni 6ch Channels
#define VOLUME_UP       0x87        //Kod prijaty pri stlaceni Volume UP
#define VOLUME_DOWN     0x9C        //Kod prijaty pri stlaceni Volume DOWN

unsigned char receiveBTN();
unsigned char STANDBY();
unsigned char rcvd;
unsigned char statusNEW;
int VOLUME_STATE;
int Count=0;

unsigned char oktet1;
unsigned char oktet2;
unsigned char oktet3;
unsigned char getch();

main()
{
        OSCCON  = 0b11101001; //Interny oscilator 4Mhz
        OSCSTAT = 0b11000110; //Inicializacia oscilatora
        OPTION_REG = 0b00000111;
        //PORTA register
        PORTA   = 0b00000000; //Pociatocny stav 0
        TRISA   = 0b00000000; //RA1,RA2 vstup //RA0,RA3-RA7 vystupy
        ANSELA  = 0b00000000; //RA0 set as analog input, RA1-RA7 set as digital I/O pins
        LATA    = 0b00000000;
        WPUA    = 0b00000000; //Weak pull-up vypnute
        //PORTB register
        PORTB   = 0b11100000; //Pociatocny stav 0
        TRISB   = 0b11100010; //RB0,RB5,RB6,RB7 vstupy //RB1,RB2,RB3,RB4 vystupy
        ANSELB  = 0b00000000; //RA0-RA7 digitalne I/O piny
        LATB    = 0b00000000;
        WPUB    = 0b11100000; //Weak pull-up zapnute pre RB5,RB6,RB7
        //Periferie
        //APFCON0
                RXDTSEL_bit = 0;        //RX/DT funkcia na RB1
        /*PIE1    = 0b00100000;
        PIE2    = 0b00000000;
        PIE3    = 0x00;
        PIE4    = 0x00;*/
        T1CON   = 0xC0;
        CM1CON0 = 0x00;
        CM1CON1 = 0x00;
        CM2CON0 = 0x00;
        CM2CON1 = 0x00;
        //CM1CON0 = 0b11000100; //C1OUT interny //ak Vn<Vp potom C1OUT=1 //CMOUT=C1OUT
        //CM1CON1 = 0b00110001; //Invertujúci vstup C12IN- na porte RA1 //neinvertujúci vstup C12IN+ na porteRA2

        //BRGH_bit = 1;
        SPBRGL  = 0b00110011; //Parovy register s SPBRGH, k dosiahnutiu pozadovanej prenosovej rychlosti
        SPBRGH  = 0b00000000; //Parovy register s SPBRGL, k dosiahnutiu pozadovanej prenosovej rychlosti
        TXSTA   = 0b00000000;
        RCSTA   = 0b10111000;
                //CREN_bit= 1;
                //SYNC_bit= 0;
                //SPEN_bit= 1;
        BAUDCON = 0x00;
        INTCON  = 0b11100000;
        CPSCON0 = 0x00;
        RCIF_bit= 0;
        //RCIRCIDL_bit
	TMR0=0;

        while(1)
        {
                delay_ms(10);
                RCREG=0;                                                        //clear received data
                delay_ms(10);
                while(RCIF_bit==0);             				//wait for receive
                rcvd=receiveBTN();
                switch(rcvd)
                {
                        case MUTE:
                        {
                                RA3_bit=!RA3_bit;
                                delay_ms(10);
                                      break;
                        }
                        case VOLUME_UP:
                        {
                                //if(!MC1OUT_bit)VOLUME_STATE=0;                //If not reading MC1OUT_bit then VOLUME_STATE is set as no end position(free to rotate to both direction)
                                //if(VOLUME_STATE=1) break;                	//If reading MC1OUT_bit=1 then rotation position is on MAX
                                RB2_bit=1;
                                while(getch()!=0)
                                {
				       	while(!TMR0IF_bit);

        					TMR0IF_bit=0;
        				       	Count++;
        				       	if(Count==3)
        				       	{
                                               		Count=0;

        				       	}

                                }
                                delay_ms(10);
                                RB2_bit=0;
                                break;
                        }
                        case VOLUME_DOWN:
                        {
                                //if(!MC1OUT_bit)VOLUME_STATE=0;
                                //if(VOLUME_STATE=2) break;
                                RB3_bit=1;

                                while(getch()==VOLUME_DOWN)
                                {
                                        while(!TMR0IF_bit);
        				TMR0IF_bit=0;
        			       	Count++;
        			       	if(Count==3)
        			       	{
                                        Count=0;

        			       	}
                                }
                                delay_ms(10);
                                RB3_bit=0;
                                delay_ms(10);
                                break;
                        }
                        default:
                        {

                                break;
                        }
                }
                delay_ms(10);
                RCREG=0;                                                        //clear received data
                delay_ms(10);
        }
}

unsigned char getch() // prijme jeden oktet
{
        int cnt;
        cnt=0;
        while(RCIF_bit==0) // set when register is empty
        {
                cnt=cnt+1;
                if(cnt>1000)return 0;
        }
        return RCREG;

}

unsigned char receiveBTN()
{
        unsigned char oktet1;
        unsigned char oktet2;
        unsigned char oktet3;
        oktet1 = getch(); // caka na odpoved od uzivatela
        oktet2 = getch();
        oktet3 = getch();
        if((oktet1==oktet2)||(oktet2==oktet3)||(oktet1==oktet3))
        {
                if(oktet1==oktet2)return oktet1;
                if(oktet2==oktet3)return oktet2;
                if(oktet1==oktet3)return oktet3;
        }
        return 0;
}
/*
unsigned char STANDBY()
{
        rcvd=0xff;
        delay_ms(10);
        RCREG=0;
        delay_ms(10);
        while(rcvd!=ON_OFF)
        {
                  //rcvd=receiveBTN();
        }
}*/