CMSIS DSP Software Library: arm_lms_norm_init_q15.c Source File

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# arm_lms_norm_init_q15.c

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    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_lms_norm_init_q15.c
    00009 *
    00010 * Description:  Q15 NLMS 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 0.0.7  2010/06/10
    00030 *    Misra-C changes done
    00031 * ---------------------------------------------------------------------------*/
    00032
    00033 #include "arm_math.h"
    00034 #include "arm_common_tables.h"
    00035
    00064 void arm_lms_norm_init_q15(
    00065   arm_lms_norm_instance_q15 * S,
    00066   uint16_t numTaps,
    00067   q15_t * pCoeffs,
    00068   q15_t * pState,
    00069   q15_t mu,
    00070   uint32_t blockSize,
    00071   uint8_t postShift)
    00072 {
    00073   /* Assign filter taps */
    00074   S->numTaps = numTaps;
    00075
    00076   /* Assign coefficient pointer */
    00077   S->pCoeffs = pCoeffs;
    00078
    00079   /* Clear state buffer and size is always blockSize + numTaps - 1 */
    00080   memset(pState, 0, (numTaps + (blockSize - 1u)) * sizeof(q15_t));
    00081
    00082   /* Assign post Shift value applied to coefficients */
    00083   S->postShift = postShift;
    00084
    00085   /* Assign state pointer */
    00086   S->pState = pState;
    00087
    00088   /* Assign Step size value */
    00089   S->mu = mu;
    00090
    00091   /* Initialize reciprocal pointer table */
    00092   S->recipTable = armRecipTableQ15;
    00093
    00094   /* Initialise Energy to zero */
    00095   S->energy = 0;
    00096
    00097   /* Initialise x0 to zero */
    00098   S->x0 = 0;
    00099
    00100 }
    00101

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