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# arm_fir_init_q15.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_init_q15.c
    00009 *
    00010 * Description:  Q15 FIR filter initialization function.
    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 0.0.5  2010/04/26
    00027 *    incorporated review comments and updated with latest CMSIS layer
    00028 *
    00029 * Version 0.0.3  2010/03/10
    00030 *    Initial version
    00031 * ------------------------------------------------------------------- */
    00032
    00033 #include "arm_math.h"
    00034
    00082 arm_status arm_fir_init_q15(
    00083   arm_fir_instance_q15 * S,
    00084   uint16_t numTaps,
    00085   q15_t * pCoeffs,
    00086   q15_t * pState,
    00087   uint32_t blockSize)
    00088 {
    00089   arm_status status;
    00090
    00091   /* The Number of filter coefficients in the filter must be even and at least 4 */
    00092   if((numTaps < 4u) || (numTaps & 0x1u))
    00093   {
    00094     status = ARM_MATH_ARGUMENT_ERROR;
    00095   }
    00096   else
    00097   {
    00098     /* Assign filter taps */
    00099     S->numTaps = numTaps;
    00100
    00101     /* Assign coefficient pointer */
    00102     S->pCoeffs = pCoeffs;
    00103
    00104     /* Clear the state buffer.  The size is always (blockSize + numTaps - 1) */
    00105     memset(pState, 0, (numTaps + (blockSize - 1u)) * sizeof(q15_t));
    00106
    00107     /* Assign state pointer */
    00108     S->pState = pState;
    00109
    00110     status = ARM_MATH_SUCCESS;
    00111   }
    00112
    00113   return (status);
    00114 }
    00115

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