Scott Lahteine
8 years ago
committed by
GitHub
4 changed files with 14 additions and 105 deletions
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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 counter; |
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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.counter = 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.counter) { |
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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.counter = |
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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.counter <<= 1; |
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} else { |
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const uint32_t now = micros(); |
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static uint32_t next = now + this->state.period; |
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if (now >= next) { |
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--this->state.counter; |
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next = now + 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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