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88 lines
2.4 KiB
C++
88 lines
2.4 KiB
C++
/*
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Tone.cpp
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A Tone Generator Library for the ESP8266
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Original Copyright (c) 2016 Ben Pirt. All rights reserved.
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This file is part of the esp8266 core for Arduino environment.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "Arduino.h"
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#include "core_esp8266_waveform.h"
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// Which pins have a tone running on them?
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static uint32_t _toneMap = 0;
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static void _startTone(uint8_t _pin, uint32_t high, uint32_t low, unsigned long duration) {
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if (_pin > 16) {
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return;
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}
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pinMode(_pin, OUTPUT);
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high = std::max(high, (uint32_t)100);
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low = std::max(low, (uint32_t)100);
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if (startWaveform(_pin, high, low, (uint32_t) duration * 1000)) {
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_toneMap |= 1 << _pin;
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}
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}
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void tone(uint8_t _pin, unsigned int frequency, unsigned long duration) {
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if (frequency == 0) {
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noTone(_pin);
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} else {
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uint32_t period = 1000000L / frequency;
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uint32_t high = period / 2;
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uint32_t low = period - high;
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_startTone(_pin, high, low, duration);
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}
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}
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// Separate tone(float) to hopefully not pull in floating point libs unless
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// it's called with a float.
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void tone(uint8_t _pin, double frequency, unsigned long duration) {
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if (frequency < 1.0) { // FP means no exact comparisons
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noTone(_pin);
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} else {
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double period = 1000000.0 / frequency;
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uint32_t high = (uint32_t)((period / 2.0) + 0.5);
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uint32_t low = (uint32_t)(period + 0.5) - high;
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_startTone(_pin, high, low, duration);
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}
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}
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// Fix ambiguous tone() binding when adding in a duration
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void tone(uint8_t _pin, int frequency, unsigned long duration) {
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// Call the unsigned int version of the function explicitly
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tone(_pin, (unsigned int)frequency, duration);
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}
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void noTone(uint8_t _pin) {
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if (_pin > 16) {
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return;
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}
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stopWaveform(_pin);
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_toneMap &= ~(1 << _pin);
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digitalWrite(_pin, 0);
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}
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