button.cpp

#include <Arduino.h>
#include "button.h"

int prevState = 0;       // states: -1 = floating, 0 = released, 1 = pressed
int isButtonPressed = 0; // states: -1 = floating, 0 = released, 1 = pressed

void button_isr()
{
  isButtonPressed = digitalRead(PIN_BUTTON);
  Serial.println("button changed: " + String(isButtonPressed));
}

void buttonSetup()
{
  pinMode(PIN_BUTTON, INPUT_PULLUP); // Button
  // attachInterrupt(PIN_BUTTON, button_isr, CHANGE);
  // Serial.println("buttonSetup()");
}

void buttonLoop()
{
  static unsigned long buttonTick = 0;

  // non interupt
  isButtonPressed = !digitalRead(PIN_BUTTON);
  if (prevState != isButtonPressed)
  {
    prevState = isButtonPressed;

    if (isButtonPressed == 0) // on released
    {
      // pushPinHi(PIN_BUZZER, 30); // beep 30ms
      if (millis() - buttonTick >= 5000)
      { // long press 5 secs
        // scanDtcError();
        // resetECU();
        Serial.println("button pressed >= 5s");
      }
      else if (millis() - buttonTick >= 3000)
      { // long press 3 secs
        if (obd_select == 1)
          obd_select = 2;
        else
          obd_select = 1;
        saveConfig();
        Serial.println("button long pressed >= 3s");
      }
      else if (millis() - buttonTick >= 5)
      { // short press 5 ms
        pag_select++;
        if (pag_select > 4)
        {
          pag_select = 1;
        }
        // saveConfig();
        Serial.println("button short pressed <= 5ms");
      }
      buttonTick = 0;       // reset timer
      isButtonPressed = -1; // floating state
    }
    else if (isButtonPressed == 1) // on pressed
    {
      buttonTick = millis(); // start timer
    }
  }
}