/* Made by Jefferson Sandoval during the Embedded programming for the FabAcademy2021
 *  
 * This is just a simple testing code in C consisting of a button and a led, if the 
 * button is pressed, the led is going do a quick blinking with the following sequence: 
 * 1sec ON > 0.5secs OFF > 1sec ON > 0.5secs OFF > 1sec ON > turn OFF.
 * 
 * This code was uploaded to a board with an Attiny1614 microcontroller. Documentation:
 * http://fabacademy.org/2021/labs/kamplintfort/students/jefferson-sandoval/assignments/week09/
 */

#define F_CPU 3333333 //equals the frequency (20MHz) divided by 6
#include <avr/io.h>
#include <util/delay.h>

int main(void)
{
  PORTA.DIR |= PIN3_bm;  // Set LED as an output
  PORTA.DIR &= ~PIN2_bm; // Set button as an input
  PORTA.PIN2CTRL = PORT_PULLUPEN_bm; // Set PullUp resistors configuration

  while (true)
  {
    if (~PORTA.IN & PIN2_bm) // Check if button is pressed
    { // If button is pressed, do the blinking sequence
      for (int i=0; i<=3; i++){
      _delay_ms(500);         // Wait for half a sec
      PORTA.OUT |= PIN3_bm;   // Turn led on
      _delay_ms(1000);        // Wait for a sec
      PORTA.OUT &= ~PIN3_bm;} // Turn led off
    } else {
      PORTA.OUT = ~PIN3_bm;} //If button is not pressed, keep the LED off
  }
  return (0);
}