arm_iir_lattice_init_q31.c
83 lines
| 2.4 KiB
| text/x-c
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CLexer
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r41 | /*----------------------------------------------------------------------------- | ||
* Copyright (C) 2010 ARM Limited. All rights reserved. | ||||
* | ||||
* $Date: 15. July 2011 | ||||
* $Revision: V1.0.10 | ||||
* | ||||
* Project: CMSIS DSP Library | ||||
* Title: arm_iir_lattice_init_q31.c | ||||
* | ||||
* Description: Initialization function for the Q31 IIR lattice filter. | ||||
* | ||||
* 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 IIR_Lattice | ||||
* @{ | ||||
*/ | ||||
/** | ||||
* @brief Initialization function for the Q31 IIR lattice filter. | ||||
* @param[in] *S points to an instance of the Q31 IIR lattice structure. | ||||
* @param[in] numStages number of stages in the filter. | ||||
* @param[in] *pkCoeffs points to the reflection coefficient buffer. The array is of length numStages. | ||||
* @param[in] *pvCoeffs points to the ladder coefficient buffer. The array is of length numStages+1. | ||||
* @param[in] *pState points to the state buffer. The array is of length numStages+blockSize. | ||||
* @param[in] blockSize number of samples to process. | ||||
* @return none. | ||||
*/ | ||||
void arm_iir_lattice_init_q31( | ||||
arm_iir_lattice_instance_q31 * S, | ||||
uint16_t numStages, | ||||
q31_t * pkCoeffs, | ||||
q31_t * pvCoeffs, | ||||
q31_t * pState, | ||||
uint32_t blockSize) | ||||
{ | ||||
/* Assign filter taps */ | ||||
S->numStages = numStages; | ||||
/* Assign reflection coefficient pointer */ | ||||
S->pkCoeffs = pkCoeffs; | ||||
/* Assign ladder coefficient pointer */ | ||||
S->pvCoeffs = pvCoeffs; | ||||
/* Clear state buffer and size is always blockSize + numStages */ | ||||
memset(pState, 0, (numStages + blockSize) * sizeof(q31_t)); | ||||
/* Assign state pointer */ | ||||
S->pState = pState; | ||||
} | ||||
/** | ||||
* @} end of IIR_Lattice group | ||||
*/ | ||||