Cortex-R DSP Software Library: arm_iir_lattice_init

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00001 /*-----------------------------------------------------------------------------      
00002 * Copyright (C) 2011 ARM Limited. All rights reserved. 
00003 *      
00004 * $Date:        15. December 2011   
00005 * $Revision:    V2.0.0  
00006 *      
00007 * Project:      Cortex-R DSP Library 
00008 * Title:        arm_iir_lattice_init_f32.c      
00009 *      
00010 * Description:  Floating-point IIR lattice filter initialization function.      
00011 *      
00012 * Target Processor:          Cortex-R4/R5
00013 *
00014 * Version 1.0.0 2011/03/08
00015 *     Alpha release.
00016 *
00017 * Version 1.0.1 2011/09/30
00018 *     Beta release.
00019 *
00020 * Version 2.0.0 2011/12/15
00021 *     Final release. 
00022 * 
00023 * ---------------------------------------------------------------------------*/     
00024 #include "arm_math.h"     
00025      
00046 void arm_iir_lattice_init_f32(     
00047   arm_iir_lattice_instance_f32 * S,     
00048   uint16_t numStages,     
00049   float32_t * pkCoeffs,     
00050   float32_t * pvCoeffs,     
00051   float32_t * pState,     
00052   uint32_t blockSize)     
00053 {     
00054   /* Assign filter taps */     
00055   S->numStages = numStages;     
00056      
00057   /* Assign reflection coefficient pointer */     
00058   S->pkCoeffs = pkCoeffs;     
00059      
00060   /* Assign ladder coefficient pointer */     
00061   S->pvCoeffs = pvCoeffs;     
00062      
00063   /* Clear state buffer and size is always blockSize + numStages */     
00064   memset(pState, 0, (numStages + blockSize) * sizeof(float32_t));     
00065      
00066   /* Assign state pointer */     
00067   S->pState = pState;     
00068      
00069      
00070 }     
00071