Hardware beep is disabled for KH270

[t0mpr1c3]

The hardware beeper is disabled for the KH270 because the delay() function interferes with setting the solenoids.

@jpcornil-git suggests a solution without timers by calling a procedure Beep:schedule() from the main loop and refactor the code to something like this (not compiled/tested):

void Beeper::beep(uint8_t length) {
  duration = length;
  currentState = s_beep_on;
}

void Beeper::schedule() { // scheduled from loop()
  switch (currentState) {
    case s_beep_on:
      analogWrite(PIEZO_PIN, BEEP_ON_DUTY);
      currentState = s_beep_wait;
      nextState = s_beep_off;
      nextTime = millis() + BEEP_DELAY;
      break;
    case s_beep_off:
      analogWrite(PIEZO_PIN, BEEP_OFF_DUTY);
      currentState = s_wait;
      nextState = s_beep_on;
      nextTime = millis() + BEEP_DELAY;
      duration--;
      break;
    case s_beep_wait:
      if (millis() > nextTime) {
        currentState = nextState; 
        if (duration <= 0) {
          analogWrite(PIEZO_PIN, BEEP_NO_DUTY);
          currentState = s_beep_idle; // default
        }
      }
      break;
    default:
      break;
  }
}

Something similar can be done for LED/alive indication.

[clholgat]

The 270 is beeping again.