#include <avr/io.h>

#define IO_direction DDRA
#define IO_pin (1 << PA6)
#define IO_pins PINA
#define input(directions,pin) (directions &= (~pin)) // set port direction for input
#define pin_test(pins,pin) (pins & pin) // test for port pin


int main(void) {
   
   //Button = Attiny44 pin PB2
   DDRB &= ~(1<<PB2);
   PORTB |= (1<<PB2);
   
   //LED = Attiny44 pin PA2
   DDRA |= (1<<PA7);
   PORTA |= (1<<PA7);
    
   //output(serial_direction, serial_pin_out);
   
   //Hall = Attiny44 pin PA6
   input(IO_direction, IO_pin); 
   
   int hall_value = 0;
   int hall_on = 0;
   
   PORTA &= ~(1<<PA7);  //OFF
   //PORTA |= (1<<PA7); //ON
          
   while (1) {
		//reading the sensor value
		hall_value = pin_test(IO_pins,IO_pin); 
		

      if(hall_value > 0 && hall_on == 0) {
      	 //turn LED on
		PORTA |= (1<<PA7);//ON
		//PORTA &= ~(1<<PA7);//OFF
		hall_on = 1;   
      } else {
         //turn LED off
         //PORTA |= (1<<PA7);//ON
         PORTA &= ~(1<<PA7);//OFF
         hall_on = 0;
     }  
    }
}