/*
uprava 6.2.2016
*/

#define F_CPU 16000000UL //clock speed 16MHz

#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>
#include <avr/io.h>


void delay(int t)
{
    static int elapsedDelay=0;

   for(int j=elapsedDelay;j<t;j++)
   {
      if ((bit_is_clear(PINC, 0)) || (bit_is_clear(PINC, 1)) || (bit_is_clear(PINC, 2)) || (bit_is_clear(PINC, 3)) || (bit_is_clear(PINC, 4)) || (bit_is_clear(PINC, 5)))
      {
       elapsedDelay = j;
      return;
      }
      else
      {
      elapsedDelay=0;
      }
      _delay_ms(1);
   }
}



volatile int tot_overflow;  //rozdiel medzi uint8_t a int je, ze int ma o 24 bytov viac




int main(void)
{
/* na zaciatku sa musime vzdy rozhodnut, ci budu vystupne registre DDRx ako output alebo input */


DDRC &= ~(1 << PINC0);  //  -> input (0) - tlacitko 1
PORTC |= 1 << PINC0;        //  -> high level  (1)  - tlacitko 1 je na high urovni

DDRC &= ~(1 << PINC1);  //  -> input (0) - tlacitko 2
PORTC |= 1 << PINC1;        //  -> high level  (1)  - tlacitko 2 je na high urovni

DDRC &= ~(1 << PINC2);  //  -> input (0) - tlacitko 3
PORTC |= 1 << PINC2;        //  -> high level  (1)  - tlacitko 3 je na high urovni

DDRC &= ~(1 << PINC3);  //  -> input (0) - tlacitko 4
PORTC |= 1 << PINC3;        //  -> high level  (1)  - tlacitko 4 je na high urovni

DDRC &= ~(1 << PINC4);  //  -> input (0) - tlacitko 5
PORTC |= 1 << PINC4;        //  -> high level  (1)  - tlacitko 5 je na high urovni

DDRC &= ~(1 << PINC5);  //  -> input (0) - tlacitko 6
PORTC |= 1 << PINC5;        //  -> high level  (1)  - tlacitko 6 je na high urovni



int Stlacene_off_0percent   = 0;
int Stlacene_100percent     = 0;
int Stlacene_66percent      = 0;
int Stlacene_33percent      = 0;
int Stlacene_pulse          = 0;
int Stlacene_blik           = 0;


int tlacitko = 0;
int i=0;



DDRD |= 0xFF; //vsetky piny na porte D ako vystup

  // prescaler = 256
TCCR2 |= (1 << CS22)|(1 << CS21);

// initialize counter
TCNT2 = 0;

// enable overflow interrupt
TIMSK |= (1 << TOIE2);

// enable global interrupts
sei();

// initialize overflow counter variable
tot_overflow = 0;


TCCR1A |= 1<<WGM11 | 1<<COM1A1 | 1<<COM1A0;                 //Set OC1A/OC1B on compare match, clear OC1A/OC1B at BOTTOM, (inverting mode), PWM, Phase Correct, 9-bit

TCCR1B |= 1<<WGM12 | 1<<WGM13 | 1<<CS10; //| 1<<CS11;       //cs10 ON -> prescaler off  cs10, cs11 ON -> prescaler 64, clear on timer compare, top value ICR1

ICR1 = 1000;                                                //maximalna hodnota z 65535 ... (16MHz/64) /1000= 250Hz co je nasa PWM frekvencia   fpwm=fclkIO/(N*(1+TOP))



while (1)
    {

                /* PWM 0% */
        if (bit_is_clear(PINC, 0))
            {

                if (Stlacene_off_0percent == 0)
                {
                tlacitko = 1;
                Stlacene_off_0percent = 1;
                }
            }

        else
        {
        Stlacene_off_0percent = 0;
        }

                /* PWM 100% */
        if (bit_is_clear(PINC, 1))
            {

                if (Stlacene_100percent == 0)
                {
                    tlacitko = 2;
                    Stlacene_100percent = 1;
                }
            }
        else
        {
        Stlacene_100percent = 0;
        }


                /* PWM 66% */
        if (bit_is_clear(PINC, 2))
            {

                if (Stlacene_66percent  == 0)
                {
                    tlacitko = 3;
                    Stlacene_66percent  = 1;
                }
            }
        else
        {
        Stlacene_66percent  = 0;
        }

                /* PWM 33% */
        if (bit_is_clear(PINC, 3))
            {

                if (Stlacene_33percent  == 0)
                {
                tlacitko = 4;
                Stlacene_33percent  = 1;
                }
            }
        else
        {
        Stlacene_33percent  = 0;
        }

                /* pulse na PINC4 tlacitku*/
        if (bit_is_clear(PINC, 4))
            {
                if (Stlacene_pulse   == 0)
                {
                tlacitko = 5;
                Stlacene_pulse   = 0;
                }
            }

        else
        {
        Stlacene_pulse   = 0;
        }

                /* BLIK */
        if (bit_is_clear(PINC, 5))
            {

                if (Stlacene_blik  == 0)
                {
                tlacitko = 6;
                Stlacene_blik  = 1;
                }
            }
        else
        {
        Stlacene_blik  = 0;
        }







        switch (tlacitko)
        {
            case 1:                     //turn off
            OCR1A=ICR1;
            break;
            case 2:                     //100%
            OCR1A=ICR1*0;
            break;
            case 3:                     //66%
            OCR1A=ICR1*0.66;
            break;
            case 4:                     //33%
            OCR1A=ICR1*0.33;
            break;
            case 5:                     //pulse



                    for(i=0;i<50;i++)
                    {
                        OCR1A = ICR1 - i*20;
                        delay(20);

                    }


                    for(i=50;i>=0;i--)
                    {
                        OCR1A = ICR1 - i*20;
                        delay(20);
                    }
                    break;

            case 6:                     //blik


                      if (tot_overflow >= 24)
                        {
                                OCR1A ^= (1 << ICR1);   // toggles the led, to iste ako PORTB ^= (1 << 0);
                                TCNT2 = 0;            // reset counter
                                tot_overflow = 0;     // reset overflow counter
                        }


            break;

            default:
            OCR1A=ICR1;
        }
    }
}

ISR(TIMER2_OVF_vect)
{
    // keep a track of number of overflows
    tot_overflow++;
}