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# arm_iir_lattice_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_iir_lattice_init_q15.c
    00009 *
    00010 * Description:  Q15 IIR lattice 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 0.0.7  2010/06/10
    00030 *    Misra-C changes done
    00031 * ---------------------------------------------------------------------------*/
    00032
    00033 #include "arm_math.h"
    00034
    00055 void arm_iir_lattice_init_q15(
    00056   arm_iir_lattice_instance_q15 * S,
    00057   uint16_t numStages,
    00058   q15_t * pkCoeffs,
    00059   q15_t * pvCoeffs,
    00060   q15_t * pState,
    00061   uint32_t blockSize)
    00062 {
    00063   /* Assign filter taps */
    00064   S->numStages = numStages;
    00065
    00066   /* Assign reflection coefficient pointer */
    00067   S->pkCoeffs = pkCoeffs;
    00068
    00069   /* Assign ladder coefficient pointer */
    00070   S->pvCoeffs = pvCoeffs;
    00071
    00072   /* Clear state buffer and size is always blockSize + numStages */
    00073   memset(pState, 0, (numStages + blockSize) * sizeof(q15_t));
    00074
    00075   /* Assign state pointer */
    00076   S->pState = pState;
    00077
    00078
    00079 }
    00080

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