95 lines
2.9 KiB
C
95 lines
2.9 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_fir_sparse_init_q31.c
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* Description: Q31 sparse FIR 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 FIR_Sparse
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* @{
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*/
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/**
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* @brief Initialization function for the Q31 sparse FIR filter.
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* @param[in,out] *S points to an instance of the Q31 sparse FIR structure.
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* @param[in] numTaps number of nonzero coefficients in the filter.
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* @param[in] *pCoeffs points to the array of filter coefficients.
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* @param[in] *pState points to the state buffer.
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* @param[in] *pTapDelay points to the array of offset times.
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* @param[in] maxDelay maximum offset time supported.
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* @param[in] blockSize number of samples that will be processed per block.
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* @return none
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*
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* <b>Description:</b>
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* \par
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* <code>pCoeffs</code> holds the filter coefficients and has length <code>numTaps</code>.
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* <code>pState</code> holds the filter's state variables and must be of length
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* <code>maxDelay + blockSize</code>, where <code>maxDelay</code>
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* is the maximum number of delay line values.
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* <code>blockSize</code> is the number of words processed by <code>arm_fir_sparse_q31()</code> function.
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*/
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void arm_fir_sparse_init_q31(
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arm_fir_sparse_instance_q31 * S,
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uint16_t numTaps,
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q31_t * pCoeffs,
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q31_t * pState,
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int32_t * pTapDelay,
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uint16_t maxDelay,
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uint32_t blockSize)
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{
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/* Assign filter taps */
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S->numTaps = numTaps;
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/* Assign coefficient pointer */
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S->pCoeffs = pCoeffs;
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/* Assign TapDelay pointer */
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S->pTapDelay = pTapDelay;
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/* Assign MaxDelay */
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S->maxDelay = maxDelay;
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/* reset the stateIndex to 0 */
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S->stateIndex = 0U;
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/* Clear state buffer and size is always maxDelay + blockSize */
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memset(pState, 0, (maxDelay + blockSize) * sizeof(q31_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 FIR_Sparse group
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*/
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