CMSIS DSP Software Library: arm_fir_interpolate_init_q15.c Source File

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# arm_fir_interpolate_init_q15.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_interpolate_init_q15.c
    00009 *
    00010 * Description:  Q15 FIR interpolator 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
    00068 arm_status arm_fir_interpolate_init_q15(
    00069   arm_fir_interpolate_instance_q15 * S,
    00070   uint8_t L,
    00071   uint16_t numTaps,
    00072   q15_t * pCoeffs,
    00073   q15_t * pState,
    00074   uint32_t blockSize)
    00075 {
    00076   arm_status status;
    00077
    00078   /* The filter length must be a multiple of the interpolation factor */
    00079   if((numTaps % L) != 0u)
    00080   {
    00081     /* Set status as ARM_MATH_LENGTH_ERROR */
    00082     status = ARM_MATH_LENGTH_ERROR;
    00083   }
    00084   else
    00085   {
    00086
    00087     /* Assign coefficient pointer */
    00088     S->pCoeffs = pCoeffs;
    00089
    00090     /* Assign Interpolation factor */
    00091     S->L = L;
    00092
    00093     /* Assign polyPhaseLength */
    00094     S->phaseLength = numTaps / L;
    00095
    00096     /* Clear state buffer and size of buffer is always phaseLength + blockSize - 1 */
    00097     memset(pState, 0,
    00098            (blockSize + ((uint32_t) S->phaseLength - 1u)) * sizeof(q15_t));
    00099
    00100     /* Assign state pointer */
    00101     S->pState = pState;
    00102
    00103     status = ARM_MATH_SUCCESS;
    00104   }
    00105
    00106   return (status);
    00107
    00108 }
    00109

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