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The CMSIS DSP 5 library

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functions/FilteringFunctions/arm_iir_lattice_init_f32.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

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xorjoep 1:24714b45cd1b 1 /* ----------------------------------------------------------------------
xorjoep 1:24714b45cd1b 2 * Project: CMSIS DSP Library
xorjoep 1:24714b45cd1b 3 * Title: arm_iir_lattice_init_f32.c
xorjoep 1:24714b45cd1b 4 * Description: Floating-point IIR 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 IIR_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 floating-point IIR lattice filter.
xorjoep 1:24714b45cd1b 42 * @param[in] *S points to an instance of the floating-point IIR lattice structure.
xorjoep 1:24714b45cd1b 43 * @param[in] numStages number of stages in the filter.
xorjoep 1:24714b45cd1b 44 * @param[in] *pkCoeffs points to the reflection coefficient buffer. The array is of length numStages.
xorjoep 1:24714b45cd1b 45 * @param[in] *pvCoeffs points to the ladder coefficient buffer. The array is of length numStages+1.
xorjoep 1:24714b45cd1b 46 * @param[in] *pState points to the state buffer. The array is of length numStages+blockSize.
xorjoep 1:24714b45cd1b 47 * @param[in] blockSize number of samples to process.
xorjoep 1:24714b45cd1b 48 * @return none.
xorjoep 1:24714b45cd1b 49 */
xorjoep 1:24714b45cd1b 50
xorjoep 1:24714b45cd1b 51 void arm_iir_lattice_init_f32(
xorjoep 1:24714b45cd1b 52 arm_iir_lattice_instance_f32 * S,
xorjoep 1:24714b45cd1b 53 uint16_t numStages,
xorjoep 1:24714b45cd1b 54 float32_t * pkCoeffs,
xorjoep 1:24714b45cd1b 55 float32_t * pvCoeffs,
xorjoep 1:24714b45cd1b 56 float32_t * pState,
xorjoep 1:24714b45cd1b 57 uint32_t blockSize)
xorjoep 1:24714b45cd1b 58 {
xorjoep 1:24714b45cd1b 59 /* Assign filter taps */
xorjoep 1:24714b45cd1b 60 S->numStages = numStages;
xorjoep 1:24714b45cd1b 61
xorjoep 1:24714b45cd1b 62 /* Assign reflection coefficient pointer */
xorjoep 1:24714b45cd1b 63 S->pkCoeffs = pkCoeffs;
xorjoep 1:24714b45cd1b 64
xorjoep 1:24714b45cd1b 65 /* Assign ladder coefficient pointer */
xorjoep 1:24714b45cd1b 66 S->pvCoeffs = pvCoeffs;
xorjoep 1:24714b45cd1b 67
xorjoep 1:24714b45cd1b 68 /* Clear state buffer and size is always blockSize + numStages */
xorjoep 1:24714b45cd1b 69 memset(pState, 0, (numStages + blockSize) * sizeof(float32_t));
xorjoep 1:24714b45cd1b 70
xorjoep 1:24714b45cd1b 71 /* Assign state pointer */
xorjoep 1:24714b45cd1b 72 S->pState = pState;
xorjoep 1:24714b45cd1b 73
xorjoep 1:24714b45cd1b 74
xorjoep 1:24714b45cd1b 75 }
xorjoep 1:24714b45cd1b 76
xorjoep 1:24714b45cd1b 77 /**
xorjoep 1:24714b45cd1b 78 * @} end of IIR_Lattice group
xorjoep 1:24714b45cd1b 79 */