| /*----------------------------------------------------------------------------- |
| * 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 |
| */ |