MarlinFirmware/Marlin/src/libs/buzzer.h

/**
 * 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/>.
 *
 */
#pragma once

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

// Make a buzzer and macro
#if ENABLED(LCD_USE_I2C_BUZZER)
  // BUZZ() will be defined in ultralcd.h
#elif PIN_EXISTS(BEEPER)

#include "circularqueue.h"

#define TONE_QUEUE_LENGTH 4

/**
 * @brief Tone structure
 * @details Simple abstraction of a tone based on a duration and a frequency.
 */
struct tone_t {
  uint16_t duration;
  uint16_t frequency;
};

/**
 * @brief Buzzer class
 */
class Buzzer {
  public:

    typedef struct {
      tone_t   tone;
      uint32_t endtime;
    } state_t;

  private:
    static state_t state;

  protected:
    static CircularQueue<tone_t, TONE_QUEUE_LENGTH> buffer;

    /**
     * @brief Inverts the sate of a digital PIN
     * @details This will invert the current state of an digital IO pin.
     */
    FORCE_INLINE static void invert() { TOGGLE(BEEPER_PIN); }

    /**
     * @brief Turn off a digital PIN
     * @details Alias of digitalWrite(PIN, LOW) using FastIO
     */
    FORCE_INLINE static void off() { WRITE(BEEPER_PIN, LOW); }

    /**
     * @brief Turn on a digital PIN
     * @details Alias of digitalWrite(PIN, HIGH) using FastIO
     */
    FORCE_INLINE static void on() { WRITE(BEEPER_PIN, HIGH); }

    /**
     * @brief Resets the state of the class
     * @details Brings the class state to a known one.
     */
    static inline void reset() {
      off();
      state.endtime = 0;
    }

  public:
    /**
     * @brief Class constructor
     */
    Buzzer() {
      SET_OUTPUT(BEEPER_PIN);
      reset();
    }

    /**
     * @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
     */
    static void tone(const uint16_t duration, const uint16_t frequency=0);

    /**
     * @brief Tick function
     * @details This function should be called at loop, it will take care of
     *          playing the tones in the queue.
     */
    static void tick();
};

  // Provide a buzzer instance
  extern Buzzer buzzer;
  #define BUZZ(d,f) buzzer.tone(d, f)

#else // No buzz capability

  #define BUZZ(d,f) NOOP

#endif