#define F_CPU 16000000UL
#include <avr/io.h>
#include <util/delay.h>


// 7  6   5   4   3   2   1   0 -> BIT POSITION
// 8  4   2   1   8   4   2   1 -> BIT SIZE (FOR HEX)
// 0  0   0   0   0   0   0   0 -> 
// 0  0   0   1   1   1   0   0 -> 1C
// Table for for digit from 0-9 
// correspomding pins(a=2, b=3, c= 4, d=5, e=6, f=7, g=8)

uint8_t digit[10] = {
  // gfedcba (bit order: 7 segments, g=bit6 ... a=bit0)
  0b1000000, // 0 → a,b,c,d,e,f ON, g OFF
  0b1111001, // 1 → b,c ON
  0b0100100, // 2 → a,b,d,e,g ON
  0b0110000, // 3 → a,b,c,d,g ON
  0b0011001, // 4 → b,c,f,g ON
  0b0010010, // 5 → a,c,d,f,g ON
  0b0000010, // 6 → a,c,d,e,f,g ON
  0b1111000, // 7 → a,b,c ON
  0b0000000, // 8 → all ON
  0b0010000  // 9 → a,b,c,d,f,g ON
  
};

void showNumber(uint8_t num){
  
}

int main (void){
    DDRB |= (1 << PB4) | (1 << PB3) | (1 << PB2) | (1 << PB0);  // PB4, PB3, PB2 & PB0 mark as OUTPUT
    DDRD |= (1 << PD2) | (1 << PD3) | (1 << PD4) | (1 << PD5) | (1 << PD6) | (1 << PD7) // PD2 all to PD7 OUTPUT
    PORTB &= ~((1 << PB0) | (1 << PB2) | (1 << PB3) | (1 << PB4)); // clear PB4, PB3, PB2 & PB0
    PORTD &= ~((1 << PD2) | (1 << PD3) | (1 << PD4) | (1 << PD5) | (1 << PD6) | (1 << PD7))

    while(1){
      PORTB |= (1 << PB4); // RED LIGHT ON
      
      PORTB &= ~(1 << PB4);
      // _delay_ms(500);
      
      PORTB |= (1 << PB3);
      _delay_ms(500);
      PORTB &= ~(1 << PB3);
      // _delay_ms(500);
      
      PORTB |= (1 << PB2);
      _delay_ms(500);
      PORTB &= ~(1 << PB2);
      _delay_ms(500);

      
    }
  
}