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/* ----------------------------------------------------------------------
* Copyright (C) 2010-2013 ARM Limited. All rights reserved.
*
* $Date: 17. January 2013
* $Revision: V1.4.1
*
* Project: CMSIS DSP Library
* Title: arm_fir_sparse_init_q15.c
*
* Description: Q15 sparse FIR filter initialization function.
*
* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* - Neither the name of ARM LIMITED nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
* ---------------------------------------------------------------------------*/
#include "arm_math.h"
/**
* @ingroup groupFilters
*/
/**
* @addtogroup FIR_Sparse
* @{
*/
/**
* @brief Initialization function for the Q15 sparse FIR filter.
* @param[in,out] *S points to an instance of the Q15 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
*
* <b>Description:</b>
* \par
* <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 words processed by <code>arm_fir_sparse_q15()</code> function.
*/
void arm_fir_sparse_init_q15(
arm_fir_sparse_instance_q15 * S,
uint16_t numTaps,
q15_t * pCoeffs,
q15_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(q15_t));
/* Assign state pointer */
S->pState = pState;
}
/**
* @} end of FIR_Sparse group
*/
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