tmk_core/tool/mbed/mbed-sdk/libraries/dsp/dsp/Sine_f32.cpp

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2012 ARM Limited
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a copy
   5  * of this software and associated documentation files (the "Software"), to deal
   6  * in the Software without restriction, including without limitation the rights
   7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   8  * copies of the Software, and to permit persons to whom the Software is
   9  * furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  17  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  20  * SOFTWARE.
  21  */
  22 #include "Sine_f32.h"
  23 #include "math_helper.h"
  24
  25 #define RAD_2PI         (2. * PI)
  26
  27 namespace dsp {
  28
  29 Sine_f32::Sine_f32(uint32_t frequency, uint32_t sample_rate, float32_t amplitude, float32_t phase, uint32_t block_size) {
  30     _dx = RAD_2PI * ((float32_t)frequency / (float32_t)sample_rate);
  31     _amplitude = amplitude;
  32     _x = phase;
  33     _block_size = block_size;
  34 }
  35
  36 void Sine_f32::process(float32_t *sgn_in, float32_t *sgn_out) {
  37     for (uint32_t i=0; i<_block_size; i++) {
  38         *sgn_out = *sgn_in + (_amplitude * arm_sin_f32(_x));
  39         sgn_in++; sgn_out++;
  40         _x += _dx;
  41     }
  42 }
  43
  44 void Sine_f32::generate(float32_t *sgn) {
  45     for (uint32_t i=0; i<_block_size; i++) {
  46         *sgn = (_amplitude * arm_sin_f32(_x));
  47         sgn++;
  48         _x += _dx;
  49     }
  50 }
  51
  52 void Sine_f32::reset(void) {
  53     _x = 0.0f;
  54 }
  55
  56 }