// Blinking LED in C
// Created By Faisal
// 21-March-2020


#include <avr/io.h>
#include <util/delay.h>
#define F_CPU 20000000UL

int main(void) {
  // put your setup code here, to run once:
  DDRA |= (1 << DDA3); // Define pin A3 LED as an output
  DDRA &= ~(1 << DDA7); // Define pin A7 Button as an input
  PINA &= ~(1 << PINA7); // 0 to use internal pull-up resitor to pin A7, 1 to use external
  PINA |= (1 << PINA3);// Define value of LED as 1

  while (1) {
    _delay_ms(500);
    PINA &= ~(1 << PINA3);
    _delay_ms(1000);
    PINA |= (1 << PINA3);
  }
}