arm_lms_norm_init_q31.c

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/*-----------------------------------------------------------------------------      
* Copyright (C) 2011 ARM Limited. All rights reserved. 
*      
* $Date:        15. December 2011   
* $Revision:    V2.0.0  
*      
* Project:      Cortex-R DSP Library 
* Title:        arm_lms_norm_init_q31.c      
*      
* Description:  Q31 NLMS initialization function.      
*      
* Target Processor:          Cortex-R4/R5
*
* Version 1.0.0 2011/03/08
*     Alpha release.
*
* Version 1.0.1 2011/09/30
*     Beta release.
*
* Version 2.0.0 2011/12/15
*     Final release. 
* 
* ---------------------------------------------------------------------------*/     
#include "arm_math.h"     
#include "arm_common_tables.h"     
     
void arm_lms_norm_init_q31(     
  arm_lms_norm_instance_q31 * S,     
  uint16_t numTaps,     
  q31_t * pCoeffs,     
  q31_t * pState,     
  q31_t mu,     
  uint32_t blockSize,     
  uint8_t postShift)     
{     
  /* Assign filter taps */     
  S->numTaps = numTaps;     
     
  /* Assign coefficient pointer */     
  S->pCoeffs = pCoeffs;     
     
  /* Clear state buffer and size is always blockSize + numTaps - 1  */     
  memset(pState, 0, (numTaps + (blockSize - 1u)) * sizeof(q31_t));     
     
  /* Assign post Shift value applied to coefficients */     
  S->postShift = postShift;     
     
  /* Assign state pointer */     
  S->pState = pState;     
     
  /* Assign Step size value */     
  S->mu = mu;     
     
  /* Initialize reciprocal pointer table */     
  S->recipTable = armRecipTableQ31;     
     
  /* Initialise Energy to zero */     
  S->energy = 0;     
     
  /* Initialise x0 to zero */     
  S->x0 = 0;     
     
}