|
|
/* ----------------------------------------------------------------------
|
|
|
* Copyright (C) 2010 ARM Limited. All rights reserved.
|
|
|
*
|
|
|
* $Date: 29. November 2010
|
|
|
* $Revision: V1.0.3
|
|
|
*
|
|
|
* Project: CMSIS DSP Library
|
|
|
* Title: arm_fir_sparse_init_q7.c
|
|
|
*
|
|
|
* Description: Q7 sparse FIR filter initialization function.
|
|
|
*
|
|
|
* Target Processor: Cortex-M4/Cortex-M3
|
|
|
*
|
|
|
* Version 1.0.3 2010/11/29
|
|
|
* Re-organized the CMSIS folders and updated documentation.
|
|
|
*
|
|
|
* Version 1.0.2 2010/11/11
|
|
|
* Documentation updated.
|
|
|
*
|
|
|
* Version 1.0.1 2010/10/05
|
|
|
* Production release and review comments incorporated.
|
|
|
*
|
|
|
* Version 1.0.0 2010/09/20
|
|
|
* Production release and review comments incorporated
|
|
|
*
|
|
|
* Version 0.0.7 2010/06/10
|
|
|
* Misra-C changes done
|
|
|
* ---------------------------------------------------------------------------*/
|
|
|
|
|
|
#include "arm_math.h"
|
|
|
|
|
|
/**
|
|
|
* @ingroup groupFilters
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @addtogroup FIR_Sparse
|
|
|
* @{
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @brief Initialization function for the Q7 sparse FIR filter.
|
|
|
* @param[in,out] *S points to an instance of the Q7 sparse FIR structure.
|
|
|
* @param[in] numTaps number of nonzero coefficients in the filter.
|
|
|
* @param[in] *pCoeffs points to the array of filter coefficients.
|
|
|
* @param[in] *pState points to the state buffer.
|
|
|
* @param[in] *pTapDelay points to the array of offset times.
|
|
|
* @param[in] maxDelay maximum offset time supported.
|
|
|
* @param[in] blockSize number of samples that will be processed per block.
|
|
|
* @return none
|
|
|
*
|
|
|
* <b>Description:</b>
|
|
|
* \par
|
|
|
* <code>pCoeffs</code> holds the filter coefficients and has length <code>numTaps</code>.
|
|
|
* <code>pState</code> holds the filter's state variables and must be of length
|
|
|
* <code>maxDelay + blockSize</code>, where <code>maxDelay</code>
|
|
|
* is the maximum number of delay line values.
|
|
|
* <code>blockSize</code> is the
|
|
|
* number of samples processed by the <code>arm_fir_sparse_q7()</code> function.
|
|
|
*/
|
|
|
|
|
|
void arm_fir_sparse_init_q7(
|
|
|
arm_fir_sparse_instance_q7 * S,
|
|
|
uint16_t numTaps,
|
|
|
q7_t * pCoeffs,
|
|
|
q7_t * pState,
|
|
|
int32_t * pTapDelay,
|
|
|
uint16_t maxDelay,
|
|
|
uint32_t blockSize)
|
|
|
{
|
|
|
/* Assign filter taps */
|
|
|
S->numTaps = numTaps;
|
|
|
|
|
|
/* Assign coefficient pointer */
|
|
|
S->pCoeffs = pCoeffs;
|
|
|
|
|
|
/* Assign TapDelay pointer */
|
|
|
S->pTapDelay = pTapDelay;
|
|
|
|
|
|
/* Assign MaxDelay */
|
|
|
S->maxDelay = maxDelay;
|
|
|
|
|
|
/* reset the stateIndex to 0 */
|
|
|
S->stateIndex = 0u;
|
|
|
|
|
|
/* Clear state buffer and size is always maxDelay + blockSize */
|
|
|
memset(pState, 0, (maxDelay + blockSize) * sizeof(q7_t));
|
|
|
|
|
|
/* Assign state pointer */
|
|
|
S->pState = pState;
|
|
|
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @} end of FIR_Sparse group
|
|
|
*/
|
|
|
|
