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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_fir_sparse_init_q7.c
* Description: Q7 sparse FIR filter initialization function
*
* $Date: 18. March 2019
* $Revision: V1.6.0
*
* Target Processor: Cortex-M cores
* -------------------------------------------------------------------- */
/*
* Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the License); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "arm_math.h"
/**
@ingroup groupFilters
*/
/**
@addtogroup FIR_Sparse
@{
*/
/**
@brief Initialization function for the Q7 sparse FIR filter.
@param[in,out] S points to an instance of the Q7 sparse FIR structure
@param[in] numTaps number of nonzero coefficients in the filter
@param[in] pCoeffs points to the array of filter coefficients
@param[in] pState points to the state buffer
@param[in] pTapDelay points to the array of offset times
@param[in] maxDelay maximum offset time supported
@param[in] blockSize number of samples that will be processed per block
@return none
@par Details
<code>pCoeffs</code> holds the filter coefficients and has length <code>numTaps</code>.
<code>pState</code> holds the filter's state variables and must be of length
<code>maxDelay + blockSize</code>, where <code>maxDelay</code>
is the maximum number of delay line values.
<code>blockSize</code> is the
number of samples processed by the <code>arm_fir_sparse_q7()</code> function.
*/
void arm_fir_sparse_init_q7(
arm_fir_sparse_instance_q7 * S,
uint16_t numTaps,
const q7_t * pCoeffs,
q7_t * pState,
int32_t * pTapDelay,
uint16_t maxDelay,
uint32_t blockSize)
{
/* Assign filter taps */
S->numTaps = numTaps;
/* Assign coefficient pointer */
S->pCoeffs = pCoeffs;
/* Assign TapDelay pointer */
S->pTapDelay = pTapDelay;
/* Assign MaxDelay */
S->maxDelay = maxDelay;
/* reset the stateIndex to 0 */
S->stateIndex = 0U;
/* Clear state buffer and size is always maxDelay + blockSize */
memset(pState, 0, (maxDelay + blockSize) * sizeof(q7_t));
/* Assign state pointer */
S->pState = pState;
}
/**
@} end of FIR_Sparse group
*/
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