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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_fir_lattice_init_q15.c
* Description: Q15 FIR Lattice filter initialization function
*
* $Date: 18. March 2019
* $Revision: V1.6.0
*
* Target Processor: Cortex-M cores
* -------------------------------------------------------------------- */
/*
* Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the License); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "arm_math.h"
/**
@ingroup groupFilters
*/
/**
@addtogroup FIR_Lattice
@{
*/
/**
@brief Initialization function for the Q15 FIR lattice filter.
@param[in] S points to an instance of the Q15 FIR lattice structure
@param[in] numStages number of filter stages
@param[in] pCoeffs points to the coefficient buffer. The array is of length numStages
@param[in] pState points to the state buffer. The array is of length numStages
@return none
*/
void arm_fir_lattice_init_q15(
arm_fir_lattice_instance_q15 * S,
uint16_t numStages,
const q15_t * pCoeffs,
q15_t * pState)
{
/* Assign filter taps */
S->numStages = numStages;
/* Assign coefficient pointer */
S->pCoeffs = pCoeffs;
/* Clear state buffer and size is always numStages */
memset(pState, 0, (numStages) * sizeof(q15_t));
/* Assign state pointer */
S->pState = pState;
}
/**
@} end of FIR_Lattice group
*/
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