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FP-Audio-lib/synth_dc_f32.cpp

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/* Audio Library for Teensy 3.X
* Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
*
* 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.
*/
#include "synth_dc_f32.h"
void AudioSynthWaveformDc_F32::update(void)
{
audio_block_f32_t *block;
float *p, *end;
float count;
block = allocate_f32();
if (!block) return;
// inc = allocate_f32();
// if (!inc) return;
uint32_t block_length = (uint32_t)block->length;
p = (float *)(block->data);
end = p + AUDIO_BLOCK_SAMPLES;
if (state == 0) {
// steady DC output, simply fill the buffer with fixed value
arm_fill_f32(magnitude,p,block_length);
} else {
// transitioning to a new DC level
//count = (target - magnitude) / increment;
count = (target-magnitude)/ increment;
// Serial.println(count);
// Serial.println(target);
if (count >= AUDIO_BLOCK_SAMPLES) {
// this update will not reach the target
// arm_scale_f32(incblock->data,increment,inc->data,AUDIO_BLOCK_SAMPLES);
// arm_offset_f32(inc->data,magnitude,p,AUDIO_BLOCK_SAMPLES);
do {
magnitude += increment;
*p++ = magnitude;
} while (p < end);
} else {
// this update reaches the target
while (count >= 0) {
count --;
magnitude += increment;
*p++ = magnitude;
}
magnitude = target;
state = 0;
if(p < end) {
arm_fill_f32(magnitude,p,end-p);
// Serial.println(end-p);
}
}
}
AudioStream_F32::transmit(block);
AudioStream_F32::release(block);
}