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synth_waveform.h
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synth_waveform.h
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/* Audio Library for Teensy 3.X
* Copyright (c) 2014, Paul Stoffregen, [email protected]
*
* Development of this audio library was funded by PJRC.COM, LLC by sales of
* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
* open source software by purchasing Teensy or other PJRC products.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice, development funding notice, and this permission
* notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef synth_waveform_h_
#define synth_waveform_h_
#include "AudioStream.h"
#include "arm_math.h"
// waveforms.c
extern "C" {
extern const int16_t AudioWaveformSine[257];
}
#define AUDIO_SAMPLE_RATE_ROUNDED (44118)
#define DELAY_PASSTHRU -1
#define WAVEFORM_SINE 0
#define WAVEFORM_SAWTOOTH 1
#define WAVEFORM_SQUARE 2
#define WAVEFORM_TRIANGLE 3
#define WAVEFORM_ARBITRARY 4
#define WAVEFORM_PULSE 5
// todo: remove these...
#define TONE_TYPE_SINE 0
#define TONE_TYPE_SAWTOOTH 1
#define TONE_TYPE_SQUARE 2
#define TONE_TYPE_TRIANGLE 3
class AudioSynthWaveform :
public AudioStream
{
public:
AudioSynthWaveform(void) :
AudioStream(0,NULL), tone_amp(0), tone_freq(0),
tone_phase(0), tone_width(0.25), tone_incr(0), tone_type(0),
tone_offset(0), arbdata(NULL)
{
}
void frequency(float t_freq) {
if (t_freq < 0.0) t_freq = 0.0;
else if (t_freq > AUDIO_SAMPLE_RATE_EXACT / 2) t_freq = AUDIO_SAMPLE_RATE_EXACT / 2;
tone_incr = (t_freq * (0x80000000LL/AUDIO_SAMPLE_RATE_EXACT)) + 0.5;
}
void phase(float angle) {
if (angle < 0.0) angle = 0.0;
else if (angle > 360.0) {
angle = angle - 360.0;
if (angle >= 360.0) return;
}
tone_phase = angle * (2147483648.0 / 360.0);
}
void amplitude(float n) { // 0 to 1.0
if (n < 0) n = 0;
else if (n > 1.0) n = 1.0;
if ((tone_amp == 0) && n) {
// reset the phase when the amplitude was zero
// and has now been increased.
tone_phase = 0;
}
// set new magnitude
tone_amp = n * 32767.0;
}
void offset(float n) {
if (n < -1.0) n = -1.0;
else if (n > 1.0) n = 1.0;
tone_offset = n * 32767.0;
}
void pulseWidth(float n) { // 0.0 to 1.0
if (n < 0) n = 0;
else if (n > 1.0) n = 1.0;
tone_width = n * 0x7fffffffLL;
// pulse width is stored as the equivalent phase
}
void begin(short t_type) {
tone_phase = 0;
tone_type = t_type;
}
void begin(float t_amp, float t_freq, short t_type) {
amplitude(t_amp);
frequency(t_freq);
begin(t_type);
}
void arbitraryWaveform(const int16_t *data, float maxFreq) {
arbdata = data;
}
virtual void update(void);
private:
short tone_amp;
short tone_freq;
uint32_t tone_phase;
uint32_t tone_width;
// volatile prevents the compiler optimizing out the frequency function
volatile uint32_t tone_incr;
short tone_type;
int16_t tone_offset;
const int16_t *arbdata;
};
#endif