| /* ---------------------------------------------------------------------- |
| * Project: CMSIS DSP Library |
| * Title: arm_fir_lattice_init_q31.c |
| * Description: Q31 FIR lattice filter initialization function |
| * |
| * $Date: 27. January 2017 |
| * $Revision: V.1.5.1 |
| * |
| * Target Processor: Cortex-M cores |
| * -------------------------------------------------------------------- */ |
| /* |
| * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * Licensed under the Apache License, Version 2.0 (the License); you may |
| * not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an AS IS BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #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 |
| */ |