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- /* ----------------------------------------------------------------------
- * 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
- */
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