arm_fir_sparse_init_q7.c
99 lines
| 2.9 KiB
| text/x-c
|
CLexer
jeandet@pc-de-jeandet3.LAB-LPP.LOCAL
|
r41 | /* ---------------------------------------------------------------------- | ||
* Copyright (C) 2010 ARM Limited. All rights reserved. | ||||
* | ||||
* $Date: 15. July 2011 | ||||
* $Revision: V1.0.10 | ||||
* | ||||
* Project: CMSIS DSP Library | ||||
* Title: arm_fir_sparse_init_q7.c | ||||
* | ||||
* Description: Q7 sparse FIR filter initialization function. | ||||
* | ||||
* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 | ||||
* | ||||
* Version 1.0.10 2011/7/15 | ||||
* Big Endian support added and Merged M0 and M3/M4 Source code. | ||||
* | ||||
* 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 | ||||
*/ | ||||