marlin/Marlin/src/libs/buzzer.cpp

/**
 * Marlin 3D Printer Firmware
 * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
 *
 * Based on Sprinter and grbl.
 * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "../inc/MarlinConfig.h"

#if DISABLED(LCD_USE_I2C_BUZZER) && PIN_EXISTS(BEEPER)

#include "buzzer.h"
#include "../module/temperature.h"

Buzzer::state_t Buzzer::state;
CircularQueue<tone_t, TONE_QUEUE_LENGTH> Buzzer::buffer;
Buzzer buzzer;

/**
 * @brief Add a tone to the queue
 * @details Adds a tone_t structure to the ring buffer, will block IO if the
 *          queue is full waiting for one slot to get available.
 *
 * @param duration Duration of the tone in milliseconds
 * @param frequency Frequency of the tone in hertz
 */
void Buzzer::tone(const uint16_t duration, const uint16_t frequency/*=0*/) {
  while (buffer.isFull()) {
    tick();
    thermalManager.manage_heater();
  }
  tone_t tone = { duration, frequency };
  buffer.enqueue(tone);
}

void Buzzer::tick() {
  const millis_t now = millis();

  if (!state.endtime) {
    if (buffer.isEmpty()) return;

    state.tone = buffer.dequeue();
    state.endtime = now + state.tone.duration;

    if (state.tone.frequency > 0) {
      #if ENABLED(SPEAKER)
        CRITICAL_SECTION_START;
        ::tone(BEEPER_PIN, state.tone.frequency, state.tone.duration);
        CRITICAL_SECTION_END;
      #else
        on();
      #endif
    }
  }
  else if (ELAPSED(now, state.endtime)) reset();
}

#endif // !LCD_USE_I2C_BUZZER && BEEPER