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git.gir.st - tmk_keyboard.git/blob - tmk_core/tool/mbed/mbed-sdk/libraries/dsp/dsp/Sine_f32.cpp
1 /* mbed Microcontroller Library
2 * Copyright (c) 2006-2012 ARM Limited
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:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
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
23 #include "math_helper.h"
25 #define RAD_2PI (2. * PI)
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
;
33 _block_size
= block_size
;
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
));
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
));
52 void Sine_f32::reset(void) {