| /* ---------------------------------------------------------------------- |
| * Project: CMSIS DSP Library |
| * Title: arm_fir_sparse_init_q7.c |
| * Description: Q7 sparse FIR filter initialization function |
| * |
| * $Date: 18. March 2019 |
| * $Revision: V1.6.0 |
| * |
| * Target Processor: Cortex-M cores |
| * -------------------------------------------------------------------- */ |
| /* |
| * Copyright (C) 2010-2019 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_Sparse |
| @{ |
| */ |
| |
| /** |
| @brief Initialization function for the Q7 sparse FIR filter. |
| @param[in,out] S points to an instance of the Q7 sparse FIR structure |
| @param[in] numTaps number of nonzero coefficients in the filter |
| @param[in] pCoeffs points to the array of filter coefficients |
| @param[in] pState points to the state buffer |
| @param[in] pTapDelay points to the array of offset times |
| @param[in] maxDelay maximum offset time supported |
| @param[in] blockSize number of samples that will be processed per block |
| @return none |
| |
| @par Details |
| <code>pCoeffs</code> holds the filter coefficients and has length <code>numTaps</code>. |
| <code>pState</code> holds the filter's state variables and must be of length |
| <code>maxDelay + blockSize</code>, where <code>maxDelay</code> |
| is the maximum number of delay line values. |
| <code>blockSize</code> is the |
| number of samples processed by the <code>arm_fir_sparse_q7()</code> function. |
| */ |
| |
| void arm_fir_sparse_init_q7( |
| arm_fir_sparse_instance_q7 * S, |
| uint16_t numTaps, |
| const q7_t * pCoeffs, |
| q7_t * pState, |
| int32_t * pTapDelay, |
| uint16_t maxDelay, |
| uint32_t blockSize) |
| { |
| /* Assign filter taps */ |
| S->numTaps = numTaps; |
| |
| /* Assign coefficient pointer */ |
| S->pCoeffs = pCoeffs; |
| |
| /* Assign TapDelay pointer */ |
| S->pTapDelay = pTapDelay; |
| |
| /* Assign MaxDelay */ |
| S->maxDelay = maxDelay; |
| |
| /* reset the stateIndex to 0 */ |
| S->stateIndex = 0U; |
| |
| /* Clear state buffer and size is always maxDelay + blockSize */ |
| memset(pState, 0, (maxDelay + blockSize) * sizeof(q7_t)); |
| |
| /* Assign state pointer */ |
| S->pState = pState; |
| } |
| |
| /** |
| @} end of FIR_Sparse group |
| */ |