#define RUN 2
#define MODE 33
#define DEBOUNCE_TIME 200

void IRAM_ATTR modeISR();

volatile int mode = 0;
volatile bool modeChanged = false;
volatile unsigned long prev_press = millis();

//----------------------------------------------------------------------------------------------------------------------
void setup()
{
  Serial.begin(57600);
  pinMode(RUN, INPUT_PULLUP);
  pinMode(12, INPUT_PULLUP);
  pinMode(13, INPUT_PULLUP);
  pinMode(14, INPUT_PULLUP);
  pinMode(25, INPUT_PULLUP);
  pinMode(26, INPUT_PULLUP);

  attachInterrupt(12, modeISR, RISING);
  attachInterrupt(13, modeISR, RISING);
  attachInterrupt(14, modeISR, RISING);
  attachInterrupt(25, modeISR, RISING);
  attachInterrupt(26, modeISR, RISING);
  Serial.println("Welcome");
}
//----------------------------------------------------------------------------------------------------------------------
void loop()
{
  if (digitalRead(RUN) == LOW)
    Serial.print('~');
  
  if (modeChanged) {
    modeChanged = false;
    Serial.print(mode);
  }

  delay(100);
}

void IRAM_ATTR modeISR()
{
  if (millis() - prev_press < DEBOUNCE_TIME)
    return;
  prev_press = millis();
  mode++;
  modeChanged = true;
}