| /*----------------------------------------------------------------------------- |
| * Copyright (C) 2010 ARM Limited. All rights reserved. |
| * |
| * $Date: 15. July 2011 |
| * $Revision: V1.0.10 |
| * |
| * Project: CMSIS DSP Library |
| * Title: arm_fir_lattice_init_q31.c |
| * |
| * Description: Q31 FIR 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 FIR_Lattice |
| * @{ |
| */ |
| |
| /** |
| * @brief Initialization function for the Q31 FIR lattice filter. |
| * @param[in] *S points to an instance of the Q31 FIR lattice structure. |
| * @param[in] numStages number of filter stages. |
| * @param[in] *pCoeffs points to the coefficient buffer. The array is of length numStages. |
| * @param[in] *pState points to the state buffer. The array is of length numStages. |
| * @return none. |
| */ |
| |
| void arm_fir_lattice_init_q31( |
| arm_fir_lattice_instance_q31 * S, |
| uint16_t numStages, |
| q31_t * pCoeffs, |
| q31_t * pState) |
| { |
| /* Assign filter taps */ |
| S->numStages = numStages; |
| |
| /* Assign coefficient pointer */ |
| S->pCoeffs = pCoeffs; |
| |
| /* Clear state buffer and size is always numStages */ |
| memset(pState, 0, (numStages) * sizeof(q31_t)); |
| |
| /* Assign state pointer */ |
| S->pState = pState; |
| |
| } |
| |
| /** |
| * @} end of FIR_Lattice group |
| */ |