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# arm_biquad_cascade_df1_32x64_init_q31.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_biquad_cascade_df1_32x64_init_q31.c
    00009 *
    00010 * Description:  High precision Q31 Biquad cascade 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
    00077 void arm_biquad_cas_df1_32x64_init_q31(
    00078   arm_biquad_cas_df1_32x64_ins_q31 * S,
    00079   uint8_t numStages,
    00080   q31_t * pCoeffs,
    00081   q63_t * pState,
    00082   uint8_t postShift)
    00083 {
    00084   /* Assign filter stages */
    00085   S->numStages = numStages;
    00086
    00087   /* Assign postShift to be applied to the output */
    00088   S->postShift = postShift;
    00089
    00090   /* Assign coefficient pointer */
    00091   S->pCoeffs = pCoeffs;
    00092
    00093   /* Clear state buffer and size is always 4 * numStages */
    00094   memset(pState, 0, (4u * (uint32_t) numStages) * sizeof(q63_t));
    00095
    00096   /* Assign state pointer */
    00097   S->pState = pState;
    00098 }
    00099

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