Cortex-R DSP Software Library: arm_fir_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_fir_init_q31.c      
00009 *      
00010 * Description:  Q31 FIR 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      
00025 #include "arm_math.h"     
00026      
00057 void arm_fir_init_q31(     
00058   arm_fir_instance_q31 * S,     
00059   uint16_t numTaps,     
00060   q31_t * pCoeffs,     
00061   q31_t * pState,     
00062   uint32_t blockSize)     
00063 {     
00064   /* Assign filter taps */     
00065   S->numTaps = numTaps;     
00066      
00067   /* Assign coefficient pointer */     
00068   S->pCoeffs = pCoeffs;     
00069      
00070   /* Clear state buffer and state array size is (blockSize + numTaps - 1) */     
00071   memset(pState, 0, (blockSize + ((uint32_t) numTaps - 1u)) * sizeof(q31_t));     
00072      
00073   /* Assign state pointer */     
00074   S->pState = pState;     
00075      
00076 }     
00077