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321 lines
8.8 KiB
C
321 lines
8.8 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_rfft_fast_init_f32.c
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* Description: Split Radix Decimation in Frequency CFFT Floating point processing function
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*
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* $Date: 23 April 2021
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* $Revision: V1.9.0
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*
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* Target Processor: Cortex-M and Cortex-A cores
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* -------------------------------------------------------------------- */
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/*
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* Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an AS IS BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "dsp/transform_functions.h"
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#include "arm_common_tables.h"
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/**
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@ingroup RealFFT
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*/
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/**
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@addtogroup RealFFTF32
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@{
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*/
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/**
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@brief Initialization function for the 32pt floating-point real FFT.
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@param[in,out] S points to an arm_rfft_fast_instance_f32 structure
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@return execution status
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- \ref ARM_MATH_SUCCESS : Operation successful
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- \ref ARM_MATH_ARGUMENT_ERROR : an error is detected
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*/
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arm_status arm_rfft_fast_init_32_f32( arm_rfft_fast_instance_f32 * S ) {
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arm_status status;
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if( !S ) return ARM_MATH_ARGUMENT_ERROR;
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status=arm_cfft_init_16_f32(&(S->Sint));
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if (status != ARM_MATH_SUCCESS)
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{
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return(status);
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}
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S->fftLenRFFT = 32U;
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S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_32;
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return ARM_MATH_SUCCESS;
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}
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/**
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@brief Initialization function for the 64pt floating-point real FFT.
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@param[in,out] S points to an arm_rfft_fast_instance_f32 structure
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@return execution status
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- \ref ARM_MATH_SUCCESS : Operation successful
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- \ref ARM_MATH_ARGUMENT_ERROR : an error is detected
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*/
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arm_status arm_rfft_fast_init_64_f32( arm_rfft_fast_instance_f32 * S ) {
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arm_status status;
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if( !S ) return ARM_MATH_ARGUMENT_ERROR;
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status=arm_cfft_init_32_f32(&(S->Sint));
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if (status != ARM_MATH_SUCCESS)
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{
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return(status);
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}
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S->fftLenRFFT = 64U;
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S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_64;
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return ARM_MATH_SUCCESS;
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}
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/**
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@brief Initialization function for the 128pt floating-point real FFT.
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@param[in,out] S points to an arm_rfft_fast_instance_f32 structure
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@return execution status
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- \ref ARM_MATH_SUCCESS : Operation successful
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- \ref ARM_MATH_ARGUMENT_ERROR : an error is detected
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*/
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arm_status arm_rfft_fast_init_128_f32( arm_rfft_fast_instance_f32 * S ) {
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arm_status status;
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if( !S ) return ARM_MATH_ARGUMENT_ERROR;
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status=arm_cfft_init_64_f32(&(S->Sint));
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if (status != ARM_MATH_SUCCESS)
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{
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return(status);
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}
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S->fftLenRFFT = 128;
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S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_128;
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return ARM_MATH_SUCCESS;
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}
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/**
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@brief Initialization function for the 256pt floating-point real FFT.
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@param[in,out] S points to an arm_rfft_fast_instance_f32 structure
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@return execution status
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- \ref ARM_MATH_SUCCESS : Operation successful
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- \ref ARM_MATH_ARGUMENT_ERROR : an error is detected
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*/
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arm_status arm_rfft_fast_init_256_f32( arm_rfft_fast_instance_f32 * S ) {
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arm_status status;
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if( !S ) return ARM_MATH_ARGUMENT_ERROR;
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status=arm_cfft_init_128_f32(&(S->Sint));
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if (status != ARM_MATH_SUCCESS)
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{
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return(status);
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}
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S->fftLenRFFT = 256U;
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S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_256;
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return ARM_MATH_SUCCESS;
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}
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/**
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@brief Initialization function for the 512pt floating-point real FFT.
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@param[in,out] S points to an arm_rfft_fast_instance_f32 structure
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@return execution status
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- \ref ARM_MATH_SUCCESS : Operation successful
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- \ref ARM_MATH_ARGUMENT_ERROR : an error is detected
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*/
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arm_status arm_rfft_fast_init_512_f32( arm_rfft_fast_instance_f32 * S ) {
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arm_status status;
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if( !S ) return ARM_MATH_ARGUMENT_ERROR;
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status=arm_cfft_init_256_f32(&(S->Sint));
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if (status != ARM_MATH_SUCCESS)
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{
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return(status);
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}
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S->fftLenRFFT = 512U;
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S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_512;
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return ARM_MATH_SUCCESS;
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}
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/**
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@brief Initialization function for the 1024pt floating-point real FFT.
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@param[in,out] S points to an arm_rfft_fast_instance_f32 structure
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@return execution status
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- \ref ARM_MATH_SUCCESS : Operation successful
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- \ref ARM_MATH_ARGUMENT_ERROR : an error is detected
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*/
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arm_status arm_rfft_fast_init_1024_f32( arm_rfft_fast_instance_f32 * S ) {
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arm_status status;
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if( !S ) return ARM_MATH_ARGUMENT_ERROR;
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status=arm_cfft_init_512_f32(&(S->Sint));
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if (status != ARM_MATH_SUCCESS)
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{
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return(status);
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}
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S->fftLenRFFT = 1024U;
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S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_1024;
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return ARM_MATH_SUCCESS;
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}
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/**
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@brief Initialization function for the 2048pt floating-point real FFT.
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@param[in,out] S points to an arm_rfft_fast_instance_f32 structure
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@return execution status
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- \ref ARM_MATH_SUCCESS : Operation successful
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- \ref ARM_MATH_ARGUMENT_ERROR : an error is detected
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*/
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arm_status arm_rfft_fast_init_2048_f32( arm_rfft_fast_instance_f32 * S ) {
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arm_status status;
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if( !S ) return ARM_MATH_ARGUMENT_ERROR;
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status=arm_cfft_init_1024_f32(&(S->Sint));
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if (status != ARM_MATH_SUCCESS)
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{
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return(status);
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}
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S->fftLenRFFT = 2048U;
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S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_2048;
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return ARM_MATH_SUCCESS;
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}
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/**
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* @brief Initialization function for the 4096pt floating-point real FFT.
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* @param[in,out] S points to an arm_rfft_fast_instance_f32 structure
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@return execution status
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- \ref ARM_MATH_SUCCESS : Operation successful
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- \ref ARM_MATH_ARGUMENT_ERROR : an error is detected
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*/
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arm_status arm_rfft_fast_init_4096_f32( arm_rfft_fast_instance_f32 * S ) {
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arm_status status;
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if( !S ) return ARM_MATH_ARGUMENT_ERROR;
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status=arm_cfft_init_2048_f32(&(S->Sint));
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if (status != ARM_MATH_SUCCESS)
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{
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return(status);
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}
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S->fftLenRFFT = 4096U;
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S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_4096;
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return ARM_MATH_SUCCESS;
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}
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/**
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@brief Generic initialization function for the floating-point real FFT.
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@param[in,out] S points to an arm_rfft_fast_instance_f32 structure
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@param[in] fftLen length of the Real Sequence
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@return execution status
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- \ref ARM_MATH_SUCCESS : Operation successful
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- \ref ARM_MATH_ARGUMENT_ERROR : <code>fftLen</code> is not a supported length
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@par Description
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The parameter <code>fftLen</code> specifies the length of RFFT/CIFFT process.
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Supported FFT Lengths are 32, 64, 128, 256, 512, 1024, 2048, 4096.
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@par
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This Function also initializes Twiddle factor table pointer and Bit reversal table pointer.
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@par
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This function should be used only if you don't know the FFT sizes that
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you'll need at build time. The use of this function will prevent the
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linker from removing the FFT tables that are not needed and the library
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code size will be bigger than needed.
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@par
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If you use CMSIS-DSP as a static library, and if you know the FFT sizes
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that you need at build time, then it is better to use the initialization
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functions defined for each FFT size.
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*/
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arm_status arm_rfft_fast_init_f32(
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arm_rfft_fast_instance_f32 * S,
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uint16_t fftLen)
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{
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arm_status status;
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switch (fftLen)
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{
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case 4096U:
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status = arm_rfft_fast_init_4096_f32(S);
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break;
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case 2048U:
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status = arm_rfft_fast_init_2048_f32(S);
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break;
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case 1024U:
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status = arm_rfft_fast_init_1024_f32(S);
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break;
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case 512U:
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status = arm_rfft_fast_init_512_f32(S);
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break;
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case 256U:
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status = arm_rfft_fast_init_256_f32(S);
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break;
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case 128U:
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status = arm_rfft_fast_init_128_f32(S);
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break;
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case 64U:
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status = arm_rfft_fast_init_64_f32(S);
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break;
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case 32U:
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status = arm_rfft_fast_init_32_f32(S);
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break;
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default:
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return(ARM_MATH_ARGUMENT_ERROR);
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break;
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}
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return(status);
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}
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/**
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@} end of RealFFTF32 group
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*/
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