tmk_core/tool/mbed/mbed-sdk/libraries/dsp/dsp/FIR_f32.h

   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 #ifndef FIR_F32_H
  23 #define FIR_F32_H
  24
  25 #include <stdint.h>
  26 #include "arm_math.h"
  27
  28 namespace dsp {
  29
  30 template<uint16_t num_taps, uint32_t block_size=32>
  31 class FIR_f32 {
  32 public:
  33     FIR_f32(const float32_t *coeff) {
  34         arm_fir_init_f32(&fir, num_taps, (float32_t*)coeff, fir_state, block_size);
  35     }
  36
  37     void process(float32_t *sgn_in, float32_t *sgn_out) {
  38         arm_fir_f32(&fir, sgn_in, sgn_out, block_size);
  39     }
  40
  41     void reset(void) {
  42         memset(fir_state, 0, sizeof(fir_state));
  43     }
  44
  45 private:
  46     arm_fir_instance_f32 fir;
  47     float32_t fir_state[block_size + num_taps - 1];
  48 };
  49
  50 }
  51 #endif