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/**
* 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/>.
*
*/
#ifndef __BUZZER_H__
#define __BUZZER_H__
#include "types.h"
#include "fastio.h"
#include "circularqueue.h"
#include "temperature.h"
#include "MarlinConfig.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 {
private:
struct state_t {
tone_t tone;
uint32_t endtime;
} state;
protected:
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.
*/
void invert() {
TOGGLE(BEEPER_PIN);
}
/**
* @brief Turn off a digital PIN
* @details Alias of digitalWrite(PIN, LOW) using FastIO
*/
void off() {
WRITE(BEEPER_PIN, LOW);
}
/**
* @brief Turn on a digital PIN
* @details Alias of digitalWrite(PIN, HIGH) using FastIO
*/
void on() {
WRITE(BEEPER_PIN, HIGH);
}
/**
* @brief Resets the state of the class
* @details Brings the class state to a known one.
*/
void reset() {
this->off();
this->state.endtime = 0;
}
public:
/**
* @brief Class constructor
*/
Buzzer() {
SET_OUTPUT(BEEPER_PIN);
this->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
*/
void tone(const uint16_t &duration, const uint16_t &frequency=0) {
while (buffer.isFull()) {
this->tick();
thermalManager.manage_heater();
}
tone_t tone = { duration, frequency };
this->buffer.enqueue(tone);
}
/**
* @brief Loop function
* @details This function should be called at loop, it will take care of
* playing the tones in the queue.
*/
virtual void tick() {
const millis_t now = millis();
if (!this->state.endtime) {
if (this->buffer.isEmpty()) return;
this->state.tone = this->buffer.dequeue();
this->state.endtime = now + this->state.tone.duration;
if (this->state.tone.frequency > 0) {
#if ENABLED(SPEAKER)
CRITICAL_SECTION_START;
::tone(BEEPER_PIN, this->state.tone.frequency, this->state.tone.duration);
CRITICAL_SECTION_END;
#else
this->on();
#endif
}
}
else if (ELAPSED(now, this->state.endtime)) this->reset();
}
};
extern Buzzer buzzer;
#endif
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