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66 lines
1.8 KiB
66 lines
1.8 KiB
/*
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* AdioSynthWaveformSine_F32
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*
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* Created: Chip Audette (OpenAudio) Feb 2017
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* Modeled on: AudioSynthWaveformSine from Teensy Audio Library
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*
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* Purpose: Create sine wave of given amplitude and frequency
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*
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* License: MIT License. Use at your own risk.
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*
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*/
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#ifndef synth_sine_f32_h_
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#define synth_sine_f32_h_
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#include "Arduino.h"
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#include "AudioStream_F32.h"
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#include "arm_math.h"
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class AudioSynthWaveformSine_F32 : public AudioStream_F32
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{
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//GUI: inputs:0, outputs:1 //this line used for automatic generation of GUI node
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//GUI: shortName:sine //this line used for automatic generation of GUI node
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public:
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AudioSynthWaveformSine_F32() : AudioStream_F32(0, NULL), magnitude(16384) { } //uses default AUDIO_SAMPLE_RATE from AudioStream.h
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AudioSynthWaveformSine_F32(const AudioSettings_F32 &settings) : AudioStream_F32(0, NULL), magnitude(16384) {
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setSampleRate_Hz(settings.sample_rate_Hz);
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}
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void frequency(float freq) {
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if (freq < 0.0) freq = 0.0;
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else if (freq > sample_rate_Hz/2.f) freq = sample_rate_Hz/2.f;
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phase_increment = freq * (4294967296.0 / sample_rate_Hz);
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}
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void phase(float angle) {
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if (angle < 0.0f) angle = 0.0f;
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else if (angle > 360.0f) {
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angle = angle - 360.0f;
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if (angle >= 360.0f) return;
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}
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phase_accumulator = angle * (4294967296.0f / 360.0f);
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}
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void amplitude(float n) {
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if (n < 0) n = 0;
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else if (n > 1.0f) n = 1.0f;
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magnitude = n * 65536.0f;
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}
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void setSampleRate_Hz(const float &fs_Hz) {
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phase_increment *= sample_rate_Hz / fs_Hz; //change the phase increment for the new frequency
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sample_rate_Hz = fs_Hz;
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}
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void begin(void) { enabled = true; }
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void end(void) { enabled = false; }
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virtual void update(void);
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private:
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uint32_t phase_accumulator = 0;
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uint32_t phase_increment = 0;
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int32_t magnitude = 0;
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float sample_rate_Hz = AUDIO_SAMPLE_RATE;
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volatile uint8_t enabled = 1;
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};
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#endif
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