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93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
9 years ago
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/**
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* Marlin 3D Printer Firmware
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* Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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*
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* Based on Sprinter and grbl.
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* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef __SPEAKER_H__
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#define __SPEAKER_H__
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#include "buzzer.h"
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class Speaker: public Buzzer {
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private:
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typedef Buzzer super;
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struct state_t {
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tone_t tone;
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uint16_t period;
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uint16_t cycles;
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} state;
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protected:
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/**
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* @brief Resets the state of the class
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* @details Brings the class state to a known one.
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*/
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void reset() {
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super::reset();
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this->state.period = 0;
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this->state.cycles = 0;
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}
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public:
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/**
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* @brief Class constructor
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*/
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Speaker() {
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this->reset();
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}
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/**
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* @brief Loop function
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* @details This function should be called at loop, it will take care of
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* playing the tones in the queue.
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*/
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virtual void tick() {
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if (!this->state.cycles) {
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if (this->buffer.isEmpty()) return;
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this->reset();
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this->state.tone = this->buffer.dequeue();
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// Period is uint16, min frequency will be ~16Hz
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this->state.period = 1000000UL / this->state.tone.frequency;
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this->state.cycles =
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(this->state.tone.duration * 1000L) / this->state.period;
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this->state.period >>= 1;
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this->state.cycles <<= 1;
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}
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else {
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uint32_t const us = micros();
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static uint32_t next = us + this->state.period;
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if (us >= next) {
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--this->state.cycles;
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next = us + this->state.period;
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if (this->state.tone.frequency > 0) this->invert();
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}
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}
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}
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};
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#endif
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