CMSIS DSP Library from CMSIS 2.0. See http://www.onarm.com/cmsis/ for full details
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arm_lms_init_q15.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_lms_init_q15.c 00009 * 00010 * Description: Q15 LMS 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 0.0.7 2010/06/10 00027 * Misra-C changes done 00028 * ---------------------------------------------------------------------------*/ 00029 00030 #include "arm_math.h" 00031 00032 /** 00033 * @ingroup groupFilters 00034 */ 00035 00036 /** 00037 * @addtogroup LMS 00038 * @{ 00039 */ 00040 00041 /** 00042 * @brief Initialization function for the Q15 LMS filter. 00043 * @param[in] *S points to an instance of the Q15 LMS filter structure. 00044 * @param[in] numTaps number of filter coefficients. 00045 * @param[in] *pCoeffs points to the coefficient buffer. 00046 * @param[in] *pState points to the state buffer. 00047 * @param[in] mu step size that controls filter coefficient updates. 00048 * @param[in] blockSize number of samples to process. 00049 * @param[in] postShift bit shift applied to coefficients. 00050 * @return none. 00051 * 00052 * \par Description: 00053 * <code>pCoeffs</code> points to the array of filter coefficients stored in time reversed order: 00054 * <pre> 00055 * {b[numTaps-1], b[numTaps-2], b[N-2], ..., b[1], b[0]} 00056 * </pre> 00057 * The initial filter coefficients serve as a starting point for the adaptive filter. 00058 * <code>pState</code> points to the array of state variables and size of array is 00059 * <code>numTaps+blockSize-1</code> samples, where <code>blockSize</code> is the number of 00060 * input samples processed by each call to <code>arm_lms_q15()</code>. 00061 */ 00062 00063 void arm_lms_init_q15( 00064 arm_lms_instance_q15 * S, 00065 uint16_t numTaps, 00066 q15_t * pCoeffs, 00067 q15_t * pState, 00068 q15_t mu, 00069 uint32_t blockSize, 00070 uint32_t postShift) 00071 { 00072 /* Assign filter taps */ 00073 S->numTaps = numTaps; 00074 00075 /* Assign coefficient pointer */ 00076 S->pCoeffs = pCoeffs; 00077 00078 /* Clear state buffer and size is always blockSize + numTaps - 1 */ 00079 memset(pState, 0, (numTaps + (blockSize - 1u)) * sizeof(q15_t)); 00080 00081 /* Assign state pointer */ 00082 S->pState = pState; 00083 00084 /* Assign Step size value */ 00085 S->mu = mu; 00086 00087 /* Assign postShift value to be applied */ 00088 S->postShift = postShift; 00089 00090 } 00091 00092 /** 00093 * @} end of LMS group 00094 */
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