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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_iir_lattice_init_q15.c
- *
- * Description: Q15 IIR lattice 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 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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