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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:        15. July 2011
    00005 * $Revision:    V1.0.10
    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/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
    00067 arm_status arm_fir_decimate_init_q31(
    00068   arm_fir_decimate_instance_q31 * S,
    00069   uint16_t numTaps,
    00070   uint8_t M,
    00071   q31_t * pCoeffs,
    00072   q31_t * pState,
    00073   uint32_t blockSize)
    00074 {
    00075   arm_status status;
    00076
    00077   /* The size of the input block must be a multiple of the decimation factor */
    00078   if((blockSize % M) != 0u)
    00079   {
    00080     /* Set status as ARM_MATH_LENGTH_ERROR */
    00081     status = ARM_MATH_LENGTH_ERROR;
    00082   }
    00083   else
    00084   {
    00085     /* Assign filter taps */
    00086     S->numTaps = numTaps;
    00087
    00088     /* Assign coefficient pointer */
    00089     S->pCoeffs = pCoeffs;
    00090
    00091     /* Clear the state buffer.  The size is always (blockSize + numTaps - 1) */
    00092     memset(pState, 0, (numTaps + (blockSize - 1)) * sizeof(q31_t));
    00093
    00094     /* Assign state pointer */
    00095     S->pState = pState;
    00096
    00097     /* Assign Decimation factor */
    00098     S->M = M;
    00099
    00100     status = ARM_MATH_SUCCESS;
    00101   }
    00102
    00103   return (status);
    00104
    00105 }
    00106

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