00001 /* ---------------------------------------------------------------------- 00002 * Copyright (C) 2010 ARM Limited. All rights reserved. 00003 * 00004 * $Date: 15. July 2011 00005 * $Revision: V1.0.10 00006 * 00007 * Project: CMSIS DSP Library 00008 * Title: arm_fir_init_q31.c 00009 * 00010 * Description: Q31 FIR filter initialization function. 00011 * 00012 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 00013 * 00014 * Version 1.0.10 2011/7/15 00015 * Big Endian support added and Merged M0 and M3/M4 Source code. 00016 * 00017 * Version 1.0.3 2010/11/29 00018 * Re-organized the CMSIS folders and updated documentation. 00019 * 00020 * Version 1.0.2 2010/11/11 00021 * Documentation updated. 00022 * 00023 * Version 1.0.1 2010/10/05 00024 * Production release and review comments incorporated. 00025 * 00026 * Version 1.0.0 2010/09/20 00027 * Production release and review comments incorporated. 00028 * 00029 * Version 0.0.5 2010/04/26 00030 * incorporated review comments and updated with latest CMSIS layer 00031 * 00032 * Version 0.0.3 2010/03/10 00033 * Initial version 00034 * -------------------------------------------------------------------- */ 00035 00036 #include "arm_math.h" 00037 00068 void arm_fir_init_q31( 00069 arm_fir_instance_q31 * S, 00070 uint16_t numTaps, 00071 q31_t * pCoeffs, 00072 q31_t * pState, 00073 uint32_t blockSize) 00074 { 00075 /* Assign filter taps */ 00076 S->numTaps = numTaps; 00077 00078 /* Assign coefficient pointer */ 00079 S->pCoeffs = pCoeffs; 00080 00081 /* Clear state buffer and state array size is (blockSize + numTaps - 1) */ 00082 memset(pState, 0, (blockSize + ((uint32_t) numTaps - 1u)) * sizeof(q31_t)); 00083 00084 /* Assign state pointer */ 00085 S->pState = pState; 00086 00087 } 00088