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/*-----------------------------------------------------------------------------
* Copyright (C) 2010 ARM Limited. All rights reserved.
*
* $Date: 15. February 2012
* $Revision: V1.1.0
*
* Project: CMSIS DSP Library
* Title: arm_iir_lattice_init_q15.c
*
* Description: Q15 IIR lattice filter initialization function.
*
* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
*
* Version 1.1.0 2012/02/15
* Updated with more optimizations, bug fixes and minor API changes.
*
* Version 1.0.10 2011/7/15
* Big Endian support added and Merged M0 and M3/M4 Source code.
*
* Version 1.0.3 2010/11/29
* Re-organized the CMSIS folders and updated documentation.
*
* Version 1.0.2 2010/11/11
* Documentation updated.
*
* Version 1.0.1 2010/10/05
* Production release and review comments incorporated.
*
* Version 1.0.0 2010/09/20
* Production release and review comments incorporated
*
* Version 0.0.7 2010/06/10
* Misra-C changes done
* ---------------------------------------------------------------------------*/
#include "arm_math.h"
/**
* @ingroup groupFilters
*/
/**
* @addtogroup IIR_Lattice
* @{
*/
/**
* @brief Initialization function for the Q15 IIR lattice filter.
* @param[in] *S points to an instance of the Q15 IIR lattice structure.
* @param[in] numStages number of stages in the filter.
* @param[in] *pkCoeffs points to reflection coefficient buffer. The array is of length numStages.
* @param[in] *pvCoeffs points to ladder coefficient buffer. The array is of length numStages+1.
* @param[in] *pState points to state buffer. The array is of length numStages+blockSize.
* @param[in] blockSize number of samples to process per call.
* @return none.
*/
void arm_iir_lattice_init_q15(
arm_iir_lattice_instance_q15 * S,
uint16_t numStages,
q15_t * pkCoeffs,
q15_t * pvCoeffs,
q15_t * pState,
uint32_t blockSize)
{
/* Assign filter taps */
S->numStages = numStages;
/* Assign reflection coefficient pointer */
S->pkCoeffs = pkCoeffs;
/* Assign ladder coefficient pointer */
S->pvCoeffs = pvCoeffs;
/* Clear state buffer and size is always blockSize + numStages */
memset(pState, 0, (numStages + blockSize) * sizeof(q15_t));
/* Assign state pointer */
S->pState = pState;
}
/**
* @} end of IIR_Lattice group
*/
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