arm_iir_lattice_init_f32.c
83 lines
| 2.4 KiB
| text/x-c
|
CLexer
jeandet@pc-de-jeandet3.LAB-LPP.LOCAL
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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_f32.c | ||||
| * | ||||
| * Description: Floating-point IIR lattice 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 IIR_Lattice | ||||
| * @{ | ||||
| */ | ||||
| /** | ||||
| * @brief Initialization function for the floating-point IIR lattice filter. | ||||
| * @param[in] *S points to an instance of the floating-point 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_f32( | ||||
| arm_iir_lattice_instance_f32 * S, | ||||
| uint16_t numStages, | ||||
| float32_t * pkCoeffs, | ||||
| float32_t * pvCoeffs, | ||||
| float32_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(float32_t)); | ||||
| /* Assign state pointer */ | ||||
| S->pState = pState; | ||||
| } | ||||
| /** | ||||
| * @} end of IIR_Lattice group | ||||
| */ | ||||