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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_cfft_init_f64.c
* Description: Initialization function for cfft f64 instance
*
* $Date: 23 April 2021
* $Revision: V1.9.0
*
* Target Processor: Cortex-M and Cortex-A cores
* -------------------------------------------------------------------- */
/*
* Copyright (C) 2010-2021 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.
*/
#define FFTINIT(EXT,SIZE) \
S->bitRevLength = arm_cfft_sR_##EXT##_len##SIZE.bitRevLength; \
S->pBitRevTable = arm_cfft_sR_##EXT##_len##SIZE.pBitRevTable; \
S->pTwiddle = arm_cfft_sR_##EXT##_len##SIZE.pTwiddle;
/**
@addtogroup ComplexFFT
@{
*/
/**
@brief Initialization function for the cfft f64 function
@param[in,out] S points to an instance of the floating-point CFFT structure
@param[in] fftLen fft length (number of complex samples)
@return execution status
- \ref ARM_MATH_SUCCESS : Operation successful
- \ref ARM_MATH_ARGUMENT_ERROR : an error is detected
@par Use of this function is mandatory only for the MVE version of the FFT.
Other versions can still initialize directly the data structure using
variables declared in arm_const_structs.h
*/
#include "dsp/transform_functions.h"
#include "arm_common_tables.h"
#include "arm_const_structs.h"
arm_status arm_cfft_init_f64(
arm_cfft_instance_f64 * S,
uint16_t fftLen)
{
/* Initialise the default arm status */
arm_status status = ARM_MATH_SUCCESS;
/* Initialise the FFT length */
S->fftLen = fftLen;
/* Initialise the Twiddle coefficient pointer */
S->pTwiddle = NULL;
/* Initializations of Instance structure depending on the FFT length */
switch (S->fftLen) {
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F64_4096) && defined(ARM_TABLE_BITREVIDX_FLT_4096))
/* Initializations of structure parameters for 4096 point FFT */
case 4096U:
/* Initialise the bit reversal table modifier */
FFTINIT(f64,4096);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F64_2048) && defined(ARM_TABLE_BITREVIDX_FLT_2048))
/* Initializations of structure parameters for 2048 point FFT */
case 2048U:
/* Initialise the bit reversal table modifier */
FFTINIT(f64,2048);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F64_1024) && defined(ARM_TABLE_BITREVIDX_FLT_1024))
/* Initializations of structure parameters for 1024 point FFT */
case 1024U:
/* Initialise the bit reversal table modifier */
FFTINIT(f64,1024);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F64_512) && defined(ARM_TABLE_BITREVIDX_FLT_512))
/* Initializations of structure parameters for 512 point FFT */
case 512U:
/* Initialise the bit reversal table modifier */
FFTINIT(f64,512);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F64_256) && defined(ARM_TABLE_BITREVIDX_FLT_256))
case 256U:
FFTINIT(f64,256);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F64_128) && defined(ARM_TABLE_BITREVIDX_FLT_128))
case 128U:
FFTINIT(f64,128);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F64_64) && defined(ARM_TABLE_BITREVIDX_FLT_64))
case 64U:
FFTINIT(f64,64);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F64_32) && defined(ARM_TABLE_BITREVIDX_FLT_32))
case 32U:
FFTINIT(f64,32);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F64_16) && defined(ARM_TABLE_BITREVIDX_FLT_16))
case 16U:
/* Initializations of structure parameters for 16 point FFT */
FFTINIT(f64,16);
break;
#endif
default:
/* Reporting argument error if fftSize is not valid value */
status = ARM_MATH_ARGUMENT_ERROR;
break;
}
return (status);
}
/**
@} end of ComplexFFT group
*/
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