CMSIS DSP library
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cmsis_dsp/FilteringFunctions/arm_fir_sparse_init_q7.c
- Committer:
- mbed_official
- Date:
- 2013-11-08
- Revision:
- 3:7a284390b0ce
- Parent:
- 2:da51fb522205
File content as of revision 3:7a284390b0ce:
/* ---------------------------------------------------------------------- * 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_q7.c * * Description: Q7 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 Q7 sparse FIR filter. * @param[in,out] *S points to an instance of the Q7 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 samples processed by the <code>arm_fir_sparse_q7()</code> function. */ void arm_fir_sparse_init_q7( arm_fir_sparse_instance_q7 * S, uint16_t numTaps, q7_t * pCoeffs, q7_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(q7_t)); /* Assign state pointer */ S->pState = pState; } /** * @} end of FIR_Sparse group */