//
// hello.t412.3.blink.c
//

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


int main(void) {
  //
  // initialize LED pin
  //
  CPU_CCP = CCP_IOREG_gc; // unprotect clock
  CLKCTRL.MCLKCTRLB = 0; // turn off prescalar (20 MHz)
  //
  // main loop
  //

  PORTA.DIR = 0b10; //LED is defined as output
  int n = 0;
  while (1) {
    // Option 1 --> Twice more code
    // PORTA.OUTSET = 0b10
    // _delay_ms(100);
    // PORTA.OUTCLR = 0b10
    // _delay_ms(100);
    // Option 2
    PORTA.OUTTGL = 0b10;//LED is set as active and other pins are left untouched
    _delay_ms(100);
  }
}