arm_biquad_cascade_df1_32x64_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_biquad_cascade_df1_32x64_init_q31.c      
*      
* Description:  High precision Q31 Biquad cascade filter 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"     
     
void arm_biquad_cas_df1_32x64_init_q31(     
  arm_biquad_cas_df1_32x64_ins_q31 * S,     
  uint8_t numStages,     
  q31_t * pCoeffs,     
  q63_t * pState,     
  uint8_t postShift)     
{     
  /* Assign filter stages */     
  S->numStages = numStages;     
     
  /* Assign postShift to be applied to the output */     
  S->postShift = postShift;     
     
  /* Assign coefficient pointer */     
  S->pCoeffs = pCoeffs;     
     
  /* Clear state buffer and size is always 4 * numStages */     
  memset(pState, 0, (4u * (uint32_t) numStages) * sizeof(q63_t));     
     
  /* Assign state pointer */     
  S->pState = pState;     
}