FIR_f32.h

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2012 ARM Limited
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a copy
00005  * of this software and associated documentation files (the "Software"), to deal
00006  * in the Software without restriction, including without limitation the rights
00007  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008  * copies of the Software, and to permit persons to whom the Software is
00009  * furnished to do so, subject to the following conditions:
00010  *
00011  * The above copyright notice and this permission notice shall be included in
00012  * all copies or substantial portions of the Software.
00013  *
00014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
00020  * SOFTWARE.
00021  */
00022 #ifndef FIR_F32_H
00023 #define FIR_F32_H 
00024 
00025 #include <stdint.h>
00026 #include "arm_math.h"
00027 
00028 namespace dsp {
00029 
00030 template<uint16_t num_taps, uint32_t block_size=32>
00031 class FIR_f32 {
00032 public:
00033     FIR_f32(const float32_t *coeff) {
00034         arm_fir_init_f32(&fir, num_taps, (float32_t*)coeff, fir_state, block_size);
00035     }
00036     
00037     void process(float32_t *sgn_in, float32_t *sgn_out) {
00038         arm_fir_f32(&fir, sgn_in, sgn_out, block_size);
00039     }
00040     
00041     void reset(void) {
00042         memset(fir_state, 0, sizeof(fir_state));
00043     }
00044 
00045 private:
00046     arm_fir_instance_f32 fir;
00047     float32_t fir_state[block_size + num_taps - 1];
00048 };
00049 
00050 }
00051 #endif