108 lines
3.9 KiB
C
108 lines
3.9 KiB
C
/* ----------------------------------------------------------------------
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* Copyright (C) 2010-2014 ARM Limited. All rights reserved.
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*
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* $Date: 19. March 2015
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* $Revision: V.1.4.5
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*
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* Project: CMSIS DSP Library
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* Title: arm_fir_sparse_init_f32.c
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*
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* Description: Floating-point 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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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of ARM LIMITED nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 floating-point sparse FIR filter.
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* @param[in,out] *S points to an instance of the floating-point 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
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* number of samples processed by the <code>arm_fir_sparse_f32()</code> function.
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*/
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void arm_fir_sparse_init_f32(
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arm_fir_sparse_instance_f32 * S,
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uint16_t numTaps,
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float32_t * pCoeffs,
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float32_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(float32_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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