80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_iir_lattice_init_f32.c
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* Description: Floating-point IIR lattice filter initialization function
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*
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* $Date: 27. January 2017
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* $Revision: V.1.5.1
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*
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* Target Processor: Cortex-M cores
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* -------------------------------------------------------------------- */
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/*
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* Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an AS IS BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "arm_math.h"
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/**
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* @ingroup groupFilters
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*/
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/**
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* @addtogroup IIR_Lattice
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* @{
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*/
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/**
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* @brief Initialization function for the floating-point IIR lattice filter.
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* @param[in] *S points to an instance of the floating-point IIR lattice structure.
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* @param[in] numStages number of stages in the filter.
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* @param[in] *pkCoeffs points to the reflection coefficient buffer. The array is of length numStages.
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* @param[in] *pvCoeffs points to the ladder coefficient buffer. The array is of length numStages+1.
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* @param[in] *pState points to the state buffer. The array is of length numStages+blockSize.
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* @param[in] blockSize number of samples to process.
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* @return none.
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*/
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void arm_iir_lattice_init_f32(
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arm_iir_lattice_instance_f32 * S,
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uint16_t numStages,
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float32_t * pkCoeffs,
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float32_t * pvCoeffs,
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float32_t * pState,
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uint32_t blockSize)
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{
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/* Assign filter taps */
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S->numStages = numStages;
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/* Assign reflection coefficient pointer */
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S->pkCoeffs = pkCoeffs;
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/* Assign ladder coefficient pointer */
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S->pvCoeffs = pvCoeffs;
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/* Clear state buffer and size is always blockSize + numStages */
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memset(pState, 0, (numStages + blockSize) * sizeof(float32_t));
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/* Assign state pointer */
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S->pState = pState;
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}
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/**
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* @} end of IIR_Lattice group
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*/
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