CMSIS DSP Library from CMSIS 2.0. See http://www.onarm.com/cmsis/ for full details
Dependents: K22F_DSP_Matrix_least_square BNO055-ELEC3810 1BNO055 ECE4180Project--Slave2 ... more
arm_fir_init_q31.c
00001 /* ---------------------------------------------------------------------- 00002 * Copyright (C) 2010 ARM Limited. All rights reserved. 00003 * 00004 * $Date: 29. November 2010 00005 * $Revision: V1.0.3 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 00013 * 00014 * Version 1.0.3 2010/11/29 00015 * Re-organized the CMSIS folders and updated documentation. 00016 * 00017 * Version 1.0.2 2010/11/11 00018 * Documentation updated. 00019 * 00020 * Version 1.0.1 2010/10/05 00021 * Production release and review comments incorporated. 00022 * 00023 * Version 1.0.0 2010/09/20 00024 * Production release and review comments incorporated. 00025 * 00026 * Version 0.0.5 2010/04/26 00027 * incorporated review comments and updated with latest CMSIS layer 00028 * 00029 * Version 0.0.3 2010/03/10 00030 * Initial version 00031 * -------------------------------------------------------------------- */ 00032 00033 #include "arm_math.h" 00034 00035 /** 00036 * @ingroup groupFilters 00037 */ 00038 00039 /** 00040 * @addtogroup FIR 00041 * @{ 00042 */ 00043 00044 /** 00045 * @details 00046 * 00047 * @param[in,out] *S points to an instance of the Q31 FIR filter structure. 00048 * @param[in] numTaps Number of filter coefficients in the filter. 00049 * @param[in] *pCoeffs points to the filter coefficients buffer. 00050 * @param[in] *pState points to the state buffer. 00051 * @param[in] blockSize number of samples that are processed per call. 00052 * @return none. 00053 * 00054 * <b>Description:</b> 00055 * \par 00056 * <code>pCoeffs</code> points to the array of filter coefficients stored in time reversed order: 00057 * <pre> 00058 * {b[numTaps-1], b[numTaps-2], b[N-2], ..., b[1], b[0]} 00059 * </pre> 00060 * \par 00061 * <code>pState</code> points to the array of state variables. 00062 * <code>pState</code> is of length <code>numTaps+blockSize-1</code> samples, where <code>blockSize</code> is the number of input samples processed by each call to <code>arm_fir_q31()</code>. 00063 */ 00064 00065 void arm_fir_init_q31( 00066 arm_fir_instance_q31 * S, 00067 uint16_t numTaps, 00068 q31_t * pCoeffs, 00069 q31_t * pState, 00070 uint32_t blockSize) 00071 { 00072 /* Assign filter taps */ 00073 S->numTaps = numTaps; 00074 00075 /* Assign coefficient pointer */ 00076 S->pCoeffs = pCoeffs; 00077 00078 /* Clear state buffer and state array size is (blockSize + numTaps - 1) */ 00079 memset(pState, 0, (blockSize + ((uint32_t) numTaps - 1u)) * sizeof(q31_t)); 00080 00081 /* Assign state pointer */ 00082 S->pState = pState; 00083 00084 } 00085 00086 /** 00087 * @} end of FIR group 00088 */
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