Joep D / CMSIS_DSP_5

The CMSIS DSP 5 library

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functions/FilteringFunctions/arm_fir_lattice_init_q15.c@3:4098b9d3d571, 2018-06-21 (annotated)

Committer:
xorjoep
Date:
Thu Jun 21 11:56:27 2018 +0000
Revision:
3:4098b9d3d571
Parent:
1:24714b45cd1b 
headers is a folder not a library

Who changed what in which revision?

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xorjoep 1:24714b45cd1b 1 /* ----------------------------------------------------------------------
xorjoep 1:24714b45cd1b 2 * Project: CMSIS DSP Library
xorjoep 1:24714b45cd1b 3 * Title: arm_fir_lattice_init_q15.c
xorjoep 1:24714b45cd1b 4 * Description: Q15 FIR Lattice filter initialization function
xorjoep 1:24714b45cd1b 5 *
xorjoep 1:24714b45cd1b 6 * $Date: 27. January 2017
xorjoep 1:24714b45cd1b 7 * $Revision: V.1.5.1
xorjoep 1:24714b45cd1b 8 *
xorjoep 1:24714b45cd1b 9 * Target Processor: Cortex-M cores
xorjoep 1:24714b45cd1b 10 * -------------------------------------------------------------------- */
xorjoep 1:24714b45cd1b 11 /*
xorjoep 1:24714b45cd1b 12 * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
xorjoep 1:24714b45cd1b 13 *
xorjoep 1:24714b45cd1b 14 * SPDX-License-Identifier: Apache-2.0
xorjoep 1:24714b45cd1b 15 *
xorjoep 1:24714b45cd1b 16 * Licensed under the Apache License, Version 2.0 (the License); you may
xorjoep 1:24714b45cd1b 17 * not use this file except in compliance with the License.
xorjoep 1:24714b45cd1b 18 * You may obtain a copy of the License at
xorjoep 1:24714b45cd1b 19 *
xorjoep 1:24714b45cd1b 20 * www.apache.org/licenses/LICENSE-2.0
xorjoep 1:24714b45cd1b 21 *
xorjoep 1:24714b45cd1b 22 * Unless required by applicable law or agreed to in writing, software
xorjoep 1:24714b45cd1b 23 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
xorjoep 1:24714b45cd1b 24 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
xorjoep 1:24714b45cd1b 25 * See the License for the specific language governing permissions and
xorjoep 1:24714b45cd1b 26 * limitations under the License.
xorjoep 1:24714b45cd1b 27 */
xorjoep 1:24714b45cd1b 28
xorjoep 1:24714b45cd1b 29 #include "arm_math.h"
xorjoep 1:24714b45cd1b 30
xorjoep 1:24714b45cd1b 31 /**
xorjoep 1:24714b45cd1b 32 * @ingroup groupFilters
xorjoep 1:24714b45cd1b 33 */
xorjoep 1:24714b45cd1b 34
xorjoep 1:24714b45cd1b 35 /**
xorjoep 1:24714b45cd1b 36 * @addtogroup FIR_Lattice
xorjoep 1:24714b45cd1b 37 * @{
xorjoep 1:24714b45cd1b 38 */
xorjoep 1:24714b45cd1b 39
xorjoep 1:24714b45cd1b 40 /**
xorjoep 1:24714b45cd1b 41 * @brief Initialization function for the Q15 FIR lattice filter.
xorjoep 1:24714b45cd1b 42 * @param[in] *S points to an instance of the Q15 FIR lattice structure.
xorjoep 1:24714b45cd1b 43 * @param[in] numStages number of filter stages.
xorjoep 1:24714b45cd1b 44 * @param[in] *pCoeffs points to the coefficient buffer. The array is of length numStages.
xorjoep 1:24714b45cd1b 45 * @param[in] *pState points to the state buffer. The array is of length numStages.
xorjoep 1:24714b45cd1b 46 * @return none.
xorjoep 1:24714b45cd1b 47 */
xorjoep 1:24714b45cd1b 48
xorjoep 1:24714b45cd1b 49 void arm_fir_lattice_init_q15(
xorjoep 1:24714b45cd1b 50 arm_fir_lattice_instance_q15 * S,
xorjoep 1:24714b45cd1b 51 uint16_t numStages,
xorjoep 1:24714b45cd1b 52 q15_t * pCoeffs,
xorjoep 1:24714b45cd1b 53 q15_t * pState)
xorjoep 1:24714b45cd1b 54 {
xorjoep 1:24714b45cd1b 55 /* Assign filter taps */
xorjoep 1:24714b45cd1b 56 S->numStages = numStages;
xorjoep 1:24714b45cd1b 57
xorjoep 1:24714b45cd1b 58 /* Assign coefficient pointer */
xorjoep 1:24714b45cd1b 59 S->pCoeffs = pCoeffs;
xorjoep 1:24714b45cd1b 60
xorjoep 1:24714b45cd1b 61 /* Clear state buffer and size is always numStages */
xorjoep 1:24714b45cd1b 62 memset(pState, 0, (numStages) * sizeof(q15_t));
xorjoep 1:24714b45cd1b 63
xorjoep 1:24714b45cd1b 64 /* Assign state pointer */
xorjoep 1:24714b45cd1b 65 S->pState = pState;
xorjoep 1:24714b45cd1b 66
xorjoep 1:24714b45cd1b 67 }
xorjoep 1:24714b45cd1b 68
xorjoep 1:24714b45cd1b 69 /**
xorjoep 1:24714b45cd1b 70 * @} end of FIR_Lattice group
xorjoep 1:24714b45cd1b 71 */