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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_iir_lattice_init_q31.c
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*
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* Description: Initialization function for the Q31 IIR lattice filter.
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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 IIR_Lattice
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* @{
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*/
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/**
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* @brief Initialization function for the Q31 IIR lattice filter.
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* @param[in] *S points to an instance of the Q31 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_q31(
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arm_iir_lattice_instance_q31 * S,
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uint16_t numStages,
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q31_t * pkCoeffs,
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q31_t * pvCoeffs,
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q31_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(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 IIR_Lattice group
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*/
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