# CMSIS DSP Software Library: arm_biquad_cascade_df1_init_q31.c Source File

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# arm_biquad_cascade_df1_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_init_q31.c
    00009 *
    00010 * Description:  Q31 Biquad cascade DirectFormI(DF1) filter initialization function.
    00011 *
    00012 *
    00013 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
    00014 *
    00015 * Version 1.0.10 2011/7/15
    00016 *    Big Endian support added and Merged M0 and M3/M4 Source code.
    00017 *
    00018 * Version 1.0.3 2010/11/29
    00019 *    Re-organized the CMSIS folders and updated documentation.
    00020 *
    00021 * Version 1.0.2 2010/11/11
    00022 *    Documentation updated.
    00023 *
    00024 * Version 1.0.1 2010/10/05
    00025 *    Production release and review comments incorporated.
    00026 *
    00027 * Version 1.0.0 2010/09/20
    00028 *    Production release and review comments incorporated.
    00029 *
    00030 * Version 0.0.5  2010/04/26
    00031 *    incorporated review comments and updated with latest CMSIS layer
    00032 *
    00033 * Version 0.0.3  2010/03/10
    00034 *    Initial version
    00035 * -------------------------------------------------------------------- */
    00036
    00037 #include "arm_math.h"
    00038
    00081 void arm_biquad_cascade_df1_init_q31(
    00082   arm_biquad_casd_df1_inst_q31 * S,
    00083   uint8_t numStages,
    00084   q31_t * pCoeffs,
    00085   q31_t * pState,
    00086   int8_t postShift)
    00087 {
    00088   /* Assign filter stages */
    00089   S->numStages = numStages;
    00090
    00091   /* Assign postShift to be applied to the output */
    00092   S->postShift = postShift;
    00093
    00094   /* Assign coefficient pointer */
    00095   S->pCoeffs = pCoeffs;
    00096
    00097   /* Clear state buffer and size is always 4 * numStages */
    00098   memset(pState, 0, (4u * (uint32_t) numStages) * sizeof(q31_t));
    00099
    00100   /* Assign state pointer */
    00101   S->pState = pState;
    00102 }
    00103

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