- Main Page
- Modules
- Data Structures
- Files
- Examples

- File List
- Globals

# arm_fir_interpolate_init_q31.c

Go to the documentation of this file.

    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_interpolate_init_q31.c
    00009 *
    00010 * Description:  Q31 FIR interpolator 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 0.0.7  2010/06/10
    00027 *    Misra-C changes done
    00028 * ---------------------------------------------------------------------------*/
    00029
    00030 #include "arm_math.h"
    00031
    00066 arm_status arm_fir_interpolate_init_q31(
    00067   arm_fir_interpolate_instance_q31 * S,
    00068   uint8_t L,
    00069   uint16_t numTaps,
    00070   q31_t * pCoeffs,
    00071   q31_t * pState,
    00072   uint32_t blockSize)
    00073 {
    00074   arm_status status;
    00075
    00076   /* The filter length must be a multiple of the interpolation factor */
    00077   if((numTaps % L) != 0u)
    00078   {
    00079     /* Set status as ARM_MATH_LENGTH_ERROR */
    00080     status = ARM_MATH_LENGTH_ERROR;
    00081   }
    00082   else
    00083   {
    00084
    00085     /* Assign coefficient pointer */
    00086     S->pCoeffs = pCoeffs;
    00087
    00088     /* Assign Interpolation factor */
    00089     S->L = L;
    00090
    00091     /* Assign polyPhaseLength */
    00092     S->phaseLength = numTaps / L;
    00093
    00094     /* Clear state buffer and size of buffer is always phaseLength + blockSize - 1 */
    00095     memset(pState, 0,
    00096            (blockSize + ((uint32_t) S->phaseLength - 1u)) * sizeof(q31_t));
    00097
    00098     /* Assign state pointer */
    00099     S->pState = pState;
    00100
    00101     status = ARM_MATH_SUCCESS;
    00102   }
    00103
    00104   return (status);
    00105
    00106 }
    00107

All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Defines