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

- File List
- Globals

# arm_fir_interpolate_init_q15.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_q15.c
    00009 *
    00010 * Description:  Q15 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
    00065 arm_status arm_fir_interpolate_init_q15(
    00066   arm_fir_interpolate_instance_q15 * S,
    00067   uint8_t L,
    00068   uint16_t numTaps,
    00069   q15_t * pCoeffs,
    00070   q15_t * pState,
    00071   uint32_t blockSize)
    00072 {
    00073   arm_status status;
    00074
    00075   /* The filter length must be a multiple of the interpolation factor */
    00076   if((numTaps % L) != 0u)
    00077   {
    00078     /* Set status as ARM_MATH_LENGTH_ERROR */
    00079     status = ARM_MATH_LENGTH_ERROR;
    00080   }
    00081   else
    00082   {
    00083
    00084     /* Assign coefficient pointer */
    00085     S->pCoeffs = pCoeffs;
    00086
    00087     /* Assign Interpolation factor */
    00088     S->L = L;
    00089
    00090     /* Assign polyPhaseLength */
    00091     S->phaseLength = numTaps / L;
    00092
    00093     /* Clear state buffer and size of buffer is always phaseLength + blockSize - 1 */
    00094     memset(pState, 0,
    00095            (blockSize + ((uint32_t) S->phaseLength - 1u)) * sizeof(q15_t));
    00096
    00097     /* Assign state pointer */
    00098     S->pState = pState;
    00099
    00100     status = ARM_MATH_SUCCESS;
    00101   }
    00102
    00103   return (status);
    00104
    00105 }
    00106

All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Defines