text: /* ----------------------------------------------------------------------
   * Project:      CMSIS DSP Library
   * Title:        arm_fir_init_q7.c
   * Description:  Q7 FIR filter initialization function
   *
   * $Date:        27. January 2017
   * $Revision:    V.1.5.1
   *
   * Target Processor: Cortex-M cores
   * -------------------------------------------------------------------- */
  /*
   * Copyright (C) 2010-2017 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 "CMSIS_DSP/cmsis_dsp.h"
  
  /**
   * @ingroup groupFilters
   */
  
  /**
   * @addtogroup FIR
   * @{
   */
  /**
   * @param[in,out] *S points to an instance of the Q7 FIR filter structure.
   * @param[in] 	  numTaps  Number of filter coefficients in the filter.
   * @param[in] 	  *pCoeffs points to the filter coefficients buffer.
   * @param[in]     *pState points to the state buffer.
   * @param[in]     blockSize number of samples that are processed per call.
   * @return     	  none
   *
   * <b>Description:</b>
   * \par
   * <code>pCoeffs</code> points to the array of filter coefficients stored in time reversed order:
   * <pre>
   *    {b[numTaps-1], b[numTaps-2], b[N-2], ..., b[1], b[0]}
   * </pre>
   * \par
   * <code>pState</code> points to the array of state variables.
   * <code>pState</code> is of length <code>numTaps+blockSize-1</code> samples, where <code>blockSize</code> is the number of input samples processed by each call to <code>arm_fir_q7()</code>.
   */
  
  void arm_fir_init_q7(
    arm_fir_instance_q7 * S,
    uint16_t numTaps,
    q7_t * pCoeffs,
    q7_t * pState,
    uint32_t blockSize)
  {
  
    /* Assign filter taps */
    S->numTaps = numTaps;
  
    /* Assign coefficient pointer */
    S->pCoeffs = pCoeffs;
  
    /* Clear the state buffer.  The size is always (blockSize + numTaps - 1) */
    memset(pState, 0, (numTaps + (blockSize - 1u)) * sizeof(q7_t));
  
    /* Assign state pointer */
    S->pState = pState;
  
  }
  
  /**
   * @} end of FIR group
   */
  