/
arm_cfft_init_f32.c
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arm_cfft_init_f32.c
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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_cfft_init_f32.c
* Description: Initialization function for cfft f32 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 f32 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"
#if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE)
#include "arm_vec_fft.h"
#include "arm_mve_tables.h"
arm_status arm_cfft_radix4by2_rearrange_twiddles_f32(arm_cfft_instance_f32 *S, int twidCoefModifier)
{
switch (S->fftLen >> (twidCoefModifier - 1)) {
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) \
|| defined(ARM_TABLE_TWIDDLECOEF_F32_4096)
case 4096U:
S->rearranged_twiddle_tab_stride1_arr = rearranged_twiddle_tab_stride1_arr_4096_f32;
S->rearranged_twiddle_stride1 = rearranged_twiddle_stride1_4096_f32;
S->rearranged_twiddle_tab_stride2_arr = rearranged_twiddle_tab_stride2_arr_4096_f32;
S->rearranged_twiddle_stride2 = rearranged_twiddle_stride2_4096_f32;
S->rearranged_twiddle_tab_stride3_arr = rearranged_twiddle_tab_stride3_arr_4096_f32;
S->rearranged_twiddle_stride3 = rearranged_twiddle_stride3_4096_f32;
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) \
|| defined(ARM_TABLE_TWIDDLECOEF_F32_1024) || defined(ARM_TABLE_TWIDDLECOEF_F32_2048)
case 1024U:
S->rearranged_twiddle_tab_stride1_arr = rearranged_twiddle_tab_stride1_arr_1024_f32;
S->rearranged_twiddle_stride1 = rearranged_twiddle_stride1_1024_f32;
S->rearranged_twiddle_tab_stride2_arr = rearranged_twiddle_tab_stride2_arr_1024_f32;
S->rearranged_twiddle_stride2 = rearranged_twiddle_stride2_1024_f32;
S->rearranged_twiddle_tab_stride3_arr = rearranged_twiddle_tab_stride3_arr_1024_f32;
S->rearranged_twiddle_stride3 = rearranged_twiddle_stride3_1024_f32;
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) \
|| defined(ARM_TABLE_TWIDDLECOEF_F32_256) || defined(ARM_TABLE_TWIDDLECOEF_F32_512)
case 256U:
S->rearranged_twiddle_tab_stride1_arr = rearranged_twiddle_tab_stride1_arr_256_f32;
S->rearranged_twiddle_stride1 = rearranged_twiddle_stride1_256_f32;
S->rearranged_twiddle_tab_stride2_arr = rearranged_twiddle_tab_stride2_arr_256_f32;
S->rearranged_twiddle_stride2 = rearranged_twiddle_stride2_256_f32;
S->rearranged_twiddle_tab_stride3_arr = rearranged_twiddle_tab_stride3_arr_256_f32;
S->rearranged_twiddle_stride3 = rearranged_twiddle_stride3_256_f32;
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) \
|| defined(ARM_TABLE_TWIDDLECOEF_F32_64) || defined(ARM_TABLE_TWIDDLECOEF_F32_128)
case 64U:
S->rearranged_twiddle_tab_stride1_arr = rearranged_twiddle_tab_stride1_arr_64_f32;
S->rearranged_twiddle_stride1 = rearranged_twiddle_stride1_64_f32;
S->rearranged_twiddle_tab_stride2_arr = rearranged_twiddle_tab_stride2_arr_64_f32;
S->rearranged_twiddle_stride2 = rearranged_twiddle_stride2_64_f32;
S->rearranged_twiddle_tab_stride3_arr = rearranged_twiddle_tab_stride3_arr_64_f32;
S->rearranged_twiddle_stride3 = rearranged_twiddle_stride3_64_f32;
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) \
|| defined(ARM_TABLE_TWIDDLECOEF_F32_16) || defined(ARM_TABLE_TWIDDLECOEF_F32_32)
case 16U:
S->rearranged_twiddle_tab_stride1_arr = rearranged_twiddle_tab_stride1_arr_16_f32;
S->rearranged_twiddle_stride1 = rearranged_twiddle_stride1_16_f32;
S->rearranged_twiddle_tab_stride2_arr = rearranged_twiddle_tab_stride2_arr_16_f32;
S->rearranged_twiddle_stride2 = rearranged_twiddle_stride2_16_f32;
S->rearranged_twiddle_tab_stride3_arr = rearranged_twiddle_tab_stride3_arr_16_f32;
S->rearranged_twiddle_stride3 = rearranged_twiddle_stride3_16_f32;
break;
#endif
default:
return(ARM_MATH_ARGUMENT_ERROR);
break;
/* invalid sizes already filtered */
}
return(ARM_MATH_SUCCESS);
}
arm_status arm_cfft_init_f32(
arm_cfft_instance_f32 * 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) {
/* Initializations of structure parameters for 4096 point FFT */
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_BITREVIDX_FXT_4096) && defined(ARM_TABLE_TWIDDLECOEF_F32_4096))
case 4096U:
/* Initialise the bit reversal table modifier */
S->bitRevLength = ARMBITREVINDEXTABLE_FIXED_4096_TABLE_LENGTH;
S->pBitRevTable = (uint16_t *)armBitRevIndexTable_fixed_4096;
S->pTwiddle = (float32_t *)twiddleCoef_4096;
status=arm_cfft_radix4by2_rearrange_twiddles_f32(S, 1);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_BITREVIDX_FXT_2048) && defined(ARM_TABLE_TWIDDLECOEF_F32_2048))
/* Initializations of structure parameters for 2048 point FFT */
case 2048U:
/* Initialise the bit reversal table modifier */
S->bitRevLength = ARMBITREVINDEXTABLE_FIXED_2048_TABLE_LENGTH;
S->pBitRevTable = (uint16_t *)armBitRevIndexTable_fixed_2048;
S->pTwiddle = (float32_t *)twiddleCoef_2048;
status=arm_cfft_radix4by2_rearrange_twiddles_f32(S, 2);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_BITREVIDX_FXT_1024) && defined(ARM_TABLE_TWIDDLECOEF_F32_1024))
/* Initializations of structure parameters for 1024 point FFT */
case 1024U:
/* Initialise the bit reversal table modifier */
S->bitRevLength = ARMBITREVINDEXTABLE_FIXED_1024_TABLE_LENGTH;
S->pBitRevTable = (uint16_t *)armBitRevIndexTable_fixed_1024;
S->pTwiddle = (float32_t *)twiddleCoef_1024;
status=arm_cfft_radix4by2_rearrange_twiddles_f32(S, 1);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_BITREVIDX_FXT_512) && defined(ARM_TABLE_TWIDDLECOEF_F32_512))
/* Initializations of structure parameters for 512 point FFT */
case 512U:
/* Initialise the bit reversal table modifier */
S->bitRevLength = ARMBITREVINDEXTABLE_FIXED_512_TABLE_LENGTH;
S->pBitRevTable = (uint16_t *)armBitRevIndexTable_fixed_512;
S->pTwiddle = (float32_t *)twiddleCoef_512;
status=arm_cfft_radix4by2_rearrange_twiddles_f32(S, 2);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_BITREVIDX_FXT_256) && defined(ARM_TABLE_TWIDDLECOEF_F32_256))
case 256U:
S->bitRevLength = ARMBITREVINDEXTABLE_FIXED_256_TABLE_LENGTH;
S->pBitRevTable = (uint16_t *)armBitRevIndexTable_fixed_256;
S->pTwiddle = (float32_t *)twiddleCoef_256;
status=arm_cfft_radix4by2_rearrange_twiddles_f32(S, 1);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_BITREVIDX_FXT_128) && defined(ARM_TABLE_TWIDDLECOEF_F32_128))
case 128U:
S->bitRevLength = ARMBITREVINDEXTABLE_FIXED_128_TABLE_LENGTH;
S->pBitRevTable = (uint16_t *)armBitRevIndexTable_fixed_128;
S->pTwiddle = (float32_t *)twiddleCoef_128;
status=arm_cfft_radix4by2_rearrange_twiddles_f32(S, 2);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_BITREVIDX_FXT_64) && defined(ARM_TABLE_TWIDDLECOEF_F32_64))
case 64U:
S->bitRevLength = ARMBITREVINDEXTABLE_FIXED_64_TABLE_LENGTH;
S->pBitRevTable = (uint16_t *)armBitRevIndexTable_fixed_64;
S->pTwiddle = (float32_t *)twiddleCoef_64;
status=arm_cfft_radix4by2_rearrange_twiddles_f32(S, 1);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_BITREVIDX_FXT_32) && defined(ARM_TABLE_TWIDDLECOEF_F32_32))
case 32U:
S->bitRevLength = ARMBITREVINDEXTABLE_FIXED_32_TABLE_LENGTH;
S->pBitRevTable = (uint16_t *)armBitRevIndexTable_fixed_32;
S->pTwiddle = (float32_t *)twiddleCoef_32;
status=arm_cfft_radix4by2_rearrange_twiddles_f32(S, 2);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_BITREVIDX_FXT_16) && defined(ARM_TABLE_TWIDDLECOEF_F32_16))
case 16U:
/* Initializations of structure parameters for 16 point FFT */
S->bitRevLength = ARMBITREVINDEXTABLE_FIXED_16_TABLE_LENGTH;
S->pBitRevTable = (uint16_t *)armBitRevIndexTable_fixed_16;
S->pTwiddle = (float32_t *)twiddleCoef_16;
status=arm_cfft_radix4by2_rearrange_twiddles_f32(S, 1);
break;
#endif
default:
/* Reporting argument error if fftSize is not valid value */
status = ARM_MATH_ARGUMENT_ERROR;
break;
}
return (status);
}
#else
arm_status arm_cfft_init_f32(
arm_cfft_instance_f32 * 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_F32_4096) && defined(ARM_TABLE_BITREVIDX_FLT_4096))
/* Initializations of structure parameters for 4096 point FFT */
case 4096U:
/* Initialise the bit reversal table modifier */
FFTINIT(f32,4096);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_2048) && defined(ARM_TABLE_BITREVIDX_FLT_2048))
/* Initializations of structure parameters for 2048 point FFT */
case 2048U:
/* Initialise the bit reversal table modifier */
FFTINIT(f32,2048);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_1024) && defined(ARM_TABLE_BITREVIDX_FLT_1024))
/* Initializations of structure parameters for 1024 point FFT */
case 1024U:
/* Initialise the bit reversal table modifier */
FFTINIT(f32,1024);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_512) && defined(ARM_TABLE_BITREVIDX_FLT_512))
/* Initializations of structure parameters for 512 point FFT */
case 512U:
/* Initialise the bit reversal table modifier */
FFTINIT(f32,512);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_256) && defined(ARM_TABLE_BITREVIDX_FLT_256))
case 256U:
FFTINIT(f32,256);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_128) && defined(ARM_TABLE_BITREVIDX_FLT_128))
case 128U:
FFTINIT(f32,128);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_64) && defined(ARM_TABLE_BITREVIDX_FLT_64))
case 64U:
FFTINIT(f32,64);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_32) && defined(ARM_TABLE_BITREVIDX_FLT_32))
case 32U:
FFTINIT(f32,32);
break;
#endif
#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_16) && defined(ARM_TABLE_BITREVIDX_FLT_16))
case 16U:
/* Initializations of structure parameters for 16 point FFT */
FFTINIT(f32,16);
break;
#endif
default:
/* Reporting argument error if fftSize is not valid value */
status = ARM_MATH_ARGUMENT_ERROR;
break;
}
return (status);
}
#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
/**
@} end of ComplexFFT group
*/