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/* ----------------------------------------------------------------------
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* Copyright (C) 2010 ARM Limited. All rights reserved.
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*
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* $Date: 15. July 2011
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* $Revision: V1.0.10
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*
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* Project: CMSIS DSP Library
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* Title: arm_fir_sparse_init_q31.c
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*
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* Description: Q31 sparse FIR filter initialization function.
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*
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* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
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*
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* Version 1.0.10 2011/7/15
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* Big Endian support added and Merged M0 and M3/M4 Source code.
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*
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* Version 1.0.3 2010/11/29
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* Re-organized the CMSIS folders and updated documentation.
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*
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* Version 1.0.2 2010/11/11
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* Documentation updated.
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*
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* Version 1.0.1 2010/10/05
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* Production release and review comments incorporated.
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*
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* Version 1.0.0 2010/09/20
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* Production release and review comments incorporated
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*
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* Version 0.0.7 2010/06/10
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* Misra-C changes done
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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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