1 /* ----------------------------------------------------------------------
2 * Project: CMSIS DSP Library
3 * Title: arm_fir_lattice_init_f32.c
4 * Description: Floating-point FIR Lattice filter initialization function
5 *
6 * $Date: 23 April 2021
7 * $Revision: V1.9.0
8 *
9 * Target Processor: Cortex-M and Cortex-A cores
10 * -------------------------------------------------------------------- */
11 /*
12 * Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
13 *
14 * SPDX-License-Identifier: Apache-2.0
15 *
16 * Licensed under the Apache License, Version 2.0 (the License); you may
17 * not use this file except in compliance with the License.
18 * You may obtain a copy of the License at
19 *
20 * www.apache.org/licenses/LICENSE-2.0
21 *
22 * Unless required by applicable law or agreed to in writing, software
23 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
24 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
25 * See the License for the specific language governing permissions and
26 * limitations under the License.
27 */
28
29 #include "dsp/filtering_functions.h"
30
31 /**
32 @ingroup groupFilters
33 */
34
35 /**
36 @addtogroup FIR_Lattice
37 @{
38 */
39
40 /**
41 @brief Initialization function for the floating-point FIR lattice filter.
42 @param[in] S points to an instance of the floating-point FIR lattice structure
43 @param[in] numStages number of filter stages
44 @param[in] pCoeffs points to the coefficient buffer. The array is of length numStages
45 @param[in] pState points to the state buffer. The array is of length numStages
46 @return none
47 */
48
arm_fir_lattice_init_f32(arm_fir_lattice_instance_f32 * S,uint16_t numStages,const float32_t * pCoeffs,float32_t * pState)49 void arm_fir_lattice_init_f32(
50 arm_fir_lattice_instance_f32 * S,
51 uint16_t numStages,
52 const float32_t * pCoeffs,
53 float32_t * pState)
54 {
55 /* Assign filter taps */
56 S->numStages = numStages;
57
58 /* Assign coefficient pointer */
59 S->pCoeffs = pCoeffs;
60
61 /* Clear state buffer and size is always numStages */
62 memset(pState, 0, (numStages) * sizeof(float32_t));
63
64 /* Assign state pointer */
65 S->pState = pState;
66 }
67
68 /**
69 @} end of FIR_Lattice group
70 */
71
