| /* ---------------------------------------------------------------------- |
| * 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_q15.c |
| * |
| * Description: Q15 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 Q15 sparse FIR filter. |
| * @param[in,out] *S points to an instance of the Q15 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 words processed by <code>arm_fir_sparse_q15()</code> function. |
| */ |
| |
| void arm_fir_sparse_init_q15( |
| arm_fir_sparse_instance_q15 * S, |
| uint16_t numTaps, |
| q15_t * pCoeffs, |
| q15_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(q15_t)); |
| |
| /* Assign state pointer */ |
| S->pState = pState; |
| |
| } |
| |
| /** |
| * @} end of FIR_Sparse group |
| */ |
