arm_fir_init_q15.c

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/* ----------------------------------------------------------------------    
* Copyright (C) 2010-2014 ARM Limited. All rights reserved.    
*    
* $Date:        19. March 2015
* $Revision:    V.1.4.5
*    
* Project:      CMSIS DSP Library    
* Title:        arm_fir_init_q15.c    
*    
* Description:  Q15 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
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*   - 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
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*     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
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* ------------------------------------------------------------------- */

#include "arm_math.h"

arm_status arm_fir_init_q15(
  arm_fir_instance_q15 * S,
  uint16_t numTaps,
  q15_t * pCoeffs,
  q15_t * pState,
  uint32_t blockSize)
{
  arm_status status;


#ifndef ARM_MATH_CM0_FAMILY

  /* Run the below code for Cortex-M4 and Cortex-M3 */

  /* The Number of filter coefficients in the filter must be even and at least 4 */
  if(numTaps & 0x1u)
  {
    status = ARM_MATH_ARGUMENT_ERROR;
  }
  else
  {
    /* Assign filter taps */
    S->numTaps = numTaps;

    /* Assign coefficient pointer */
    S->pCoeffs = pCoeffs;

    /* Clear the state buffer.  The size is always (blockSize + numTaps ) */
    memset(pState, 0, (numTaps + (blockSize)) * sizeof(q15_t));

    /* Assign state pointer */
    S->pState = pState;

    status = ARM_MATH_SUCCESS;
  }

  return (status);

#else

  /* Run the below code for Cortex-M0 */

  /* 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(q15_t));

  /* Assign state pointer */
  S->pState = pState;

  status = ARM_MATH_SUCCESS;

  return (status);

#endif /*  #ifndef ARM_MATH_CM0_FAMILY */

}