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# arm_fir_decimate_init_q31.c

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    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_fir_decimate_init_q31.c
    00009 *
    00010 * Description:  Initialization function for Q31 FIR Decimation filter.
    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
    00064 arm_status arm_fir_decimate_init_q31(
    00065   arm_fir_decimate_instance_q31 * S,
    00066   uint16_t numTaps,
    00067   uint8_t M,
    00068   q31_t * pCoeffs,
    00069   q31_t * pState,
    00070   uint32_t blockSize)
    00071 {
    00072   arm_status status;
    00073
    00074   /* The size of the input block must be a multiple of the decimation factor */
    00075   if((blockSize % M) != 0u)
    00076   {
    00077     /* Set status as ARM_MATH_LENGTH_ERROR */
    00078     status = ARM_MATH_LENGTH_ERROR;
    00079   }
    00080   else
    00081   {
    00082     /* Assign filter taps */
    00083     S->numTaps = numTaps;
    00084
    00085     /* Assign coefficient pointer */
    00086     S->pCoeffs = pCoeffs;
    00087
    00088     /* Clear the state buffer.  The size is always (blockSize + numTaps - 1) */
    00089     memset(pState, 0, (numTaps + (blockSize - 1)) * sizeof(q31_t));
    00090
    00091     /* Assign state pointer */
    00092     S->pState = pState;
    00093
    00094     /* Assign Decimation factor */
    00095     S->M = M;
    00096
    00097     status = ARM_MATH_SUCCESS;
    00098   }
    00099
    00100   return (status);
    00101
    00102 }
    00103

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