/*
  Blink program
  Latch and Debounce for the MidTiny board (ATtiny1614).

  Author: Harley Lara
  Create: 03 May 2021
  License: (CC BY-SA 4.0) Attribution-ShareAlike 4.0 International

  This work may be reproduced, modified, distributed,
  performed, and displayed for any purpose, but must
  acknowledge this project. Copyright is retained and
  must be preserved. The work is provided as is; no
  warranty is provided, and users accept all liability.

*/

#define F_CPU 3333333
#include <avr/io.h>
#include <util/delay.h>

#define LED PIN5_bm // Define LED pin
#define BUTTON PIN4_bm // Define BUTTON pin

// saves the latest status
//    false: released
//    true: pressed
bool last = false;

int push_level = 0;
int release_level = 0;
int threshold = 50;

int main() {

  PORTA.DIR |= LED; // Define the LED port as output
  PORTA.OUT &= ~LED; // Set the initial state of the LED OFF

  PORTA.DIR &= ~BUTTON; // Define the button port as input
  PORTA.PIN4CTRL = 0; // Don't use the internal pullup resistor

  while (true) {
    if (PORTA.IN & BUTTON) {
      push_level ++;
      release_level = 0;
      if (push_level > threshold ){
        if (last == false){
          PORTA.OUT ^= LED; // LED toggle ON/OFF
          last = true;
        }
        push_level = 0;
      }
    } 
    else {
      release_level ++;
      push_level = 0;
      if (release_level > threshold){
        last = false;
        release_level = 0;
      }
    }

    _delay_ms(10);
  }

  return 0;
}