updated C code for AVR

/*
 * Current setup (1000000UL) will result in delays longer than a minute. During testing I used TCNT1 > 5000 and if(extra_time == 1)
 * which resulted in 10 second delays before PORTD update.
 */

#ifndef F_CPU
   #define F_CPU 1000000UL
#endif

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

volatile int extra_time=0;
volatile int num_presses=0;

int main(void)
{
   DDRD = 0b11111111;
   PORTD = 0b10000000;
   DDRB = 0b00000000;
   PORTB = 0b00000000;

   char button_state = 0;

   TCCR1B |= (1 << CS12) | (1 << CS10);

   while(1)
   {
      if (bit_is_clear(PINB, 0)) //button is pressed
      {
         if (button_state==0) //was previously not pressed)
         {
            num_presses++;
         }
         button_state=1;
      }
      else
      {
         if (button_state==1) //was previously pressed
         { }
         button_state=0;
      }

      if (TCNT1 >= 15625)
      {
         if (extra_time == 5 )
            {
               switch(num_presses)
               {
                  case 0:
                     PORTD = 0b10010000;
                     break;
                  case 1:
                     PORTD = 0b10000000;
                     break;
                  case 2:
                     PORTD = 0b01000000;
                     break;
                  case 3:
                     PORTD = 0b11000000;
                     break;
                  case 4:
                     PORTD = 0b00100000;
                     break;
                  case 5:
                     PORTD = 0b10100000;
                     break;
                  default:
                     PORTD =0b11110000;
                     break;
               }
               extra_time = 0;
               num_presses = 0;
            }
            else
            {
            ++extra_time;
            }
         TCNT1 = 0;
      }
   }
}