122 lines
3.5 KiB
C++
122 lines
3.5 KiB
C++
/** Backport modulated waveform to Adafruit fork
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*/
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#pragma once
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/* Audio Library for Teensy 3.X
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* Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
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*
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* Development of this audio library was funded by PJRC.COM, LLC by sales of
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* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
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* open source software by purchasing Teensy or other PJRC products.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice, development funding notice, and this permission
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* notice shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#if defined(ADAFRUIT_TRELLIS_M4_EXPRESS)
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#include <Arduino.h>
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#include <Audio.h>
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#include "AudioStream.h"
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#include "arm_math.h"
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#define WAVEFORM_TRIANGLE_VARIABLE 8
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class AudioSynthWaveformModulated : public AudioStream
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{
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public:
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AudioSynthWaveformModulated(void) : AudioStream(2, inputQueueArray),
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phase_accumulator(0), phase_increment(0), modulation_factor(32768),
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magnitude(0), arbdata(NULL), sample(0), tone_offset(0),
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tone_type(WAVEFORM_SINE), modulation_type(0) {
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}
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void frequency(float freq) {
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if (freq < 0.0) {
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freq = 0.0;
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} else if (freq > AUDIO_SAMPLE_RATE_EXACT / 2) {
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freq = AUDIO_SAMPLE_RATE_EXACT / 2;
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}
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phase_increment = freq * (4294967296.0 / AUDIO_SAMPLE_RATE_EXACT);
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if (phase_increment > 0x7FFE0000u) phase_increment = 0x7FFE0000;
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}
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void amplitude(float n) { // 0 to 1.0
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if (n < 0) {
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n = 0;
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} else if (n > 1.0) {
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n = 1.0;
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}
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magnitude = n * 65536.0;
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}
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void offset(float n) {
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if (n < -1.0) {
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n = -1.0;
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} else if (n > 1.0) {
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n = 1.0;
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}
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tone_offset = n * 32767.0;
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}
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void begin(short t_type) {
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tone_type = t_type;
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}
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void begin(float t_amp, float t_freq, short t_type) {
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amplitude(t_amp);
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frequency(t_freq);
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tone_type = t_type;
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}
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void arbitraryWaveform(const int16_t *data, float maxFreq) {
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arbdata = data;
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}
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void frequencyModulation(float octaves) {
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if (octaves > 12.0) {
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octaves = 12.0;
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} else if (octaves < 0.1) {
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octaves = 0.1;
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}
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modulation_factor = octaves * 4096.0;
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modulation_type = 0;
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}
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void phaseModulation(float degrees) {
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if (degrees > 9000.0) {
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degrees = 9000.0;
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} else if (degrees < 30.0) {
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degrees = 30.0;
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}
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modulation_factor = degrees * (65536.0 / 180.0);
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modulation_type = 1;
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}
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virtual void update(void);
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private:
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audio_block_t *inputQueueArray[2];
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uint32_t phase_accumulator;
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uint32_t phase_increment;
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uint32_t modulation_factor;
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int32_t magnitude;
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const int16_t *arbdata;
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uint32_t phasedata[AUDIO_BLOCK_SAMPLES];
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int16_t sample; // for WAVEFORM_SAMPLE_HOLD
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int16_t tone_offset;
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uint8_t tone_type;
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uint8_t modulation_type;
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};
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#endif
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