/* ---------------------------------------------------------------------- * 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_q15.c * * Description: Q15 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 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 * * Description: * \par * pCoeffs holds the filter coefficients and has length numTaps. * pState holds the filter's state variables and must be of length * maxDelay + blockSize, where maxDelay * is the maximum number of delay line values. * blockSize is the * number of words processed by arm_fir_sparse_q15() 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 */