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arm_cfft_radix4_init_f32.c
00001 /* ---------------------------------------------------------------------- 00002 * Project: CMSIS DSP Library 00003 * Title: arm_cfft_radix4_init_f32.c 00004 * Description: Radix-4 Decimation in Frequency Floating-point CFFT & CIFFT Initialization function 00005 * 00006 * $Date: 27. January 2017 00007 * $Revision: V.1.5.1 00008 * 00009 * Target Processor: Cortex-M cores 00010 * -------------------------------------------------------------------- */ 00011 /* 00012 * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved. 00013 * 00014 * SPDX-License-Identifier: Apache-2.0 00015 * 00016 * Licensed under the Apache License, Version 2.0 (the License); you may 00017 * not use this file except in compliance with the License. 00018 * You may obtain a copy of the License at 00019 * 00020 * www.apache.org/licenses/LICENSE-2.0 00021 * 00022 * Unless required by applicable law or agreed to in writing, software 00023 * distributed under the License is distributed on an AS IS BASIS, WITHOUT 00024 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00025 * See the License for the specific language governing permissions and 00026 * limitations under the License. 00027 */ 00028 00029 #include "arm_math.h" 00030 #include "arm_common_tables.h" 00031 00032 /** 00033 * @ingroup groupTransforms 00034 */ 00035 00036 /** 00037 * @addtogroup ComplexFFT 00038 * @{ 00039 */ 00040 00041 /** 00042 * @brief Initialization function for the floating-point CFFT/CIFFT. 00043 * @deprecated Do not use this function. It has been superceded by \ref arm_cfft_f32 and will be removed 00044 * in the future. 00045 * @param[in,out] *S points to an instance of the floating-point CFFT/CIFFT structure. 00046 * @param[in] fftLen length of the FFT. 00047 * @param[in] ifftFlag flag that selects forward (ifftFlag=0) or inverse (ifftFlag=1) transform. 00048 * @param[in] bitReverseFlag flag that enables (bitReverseFlag=1) or disables (bitReverseFlag=0) bit reversal of output. 00049 * @return The function returns ARM_MATH_SUCCESS if initialization is successful or ARM_MATH_ARGUMENT_ERROR if <code>fftLen</code> is not a supported value. 00050 * 00051 * \par Description: 00052 * \par 00053 * The parameter <code>ifftFlag</code> controls whether a forward or inverse transform is computed. 00054 * Set(=1) ifftFlag for calculation of CIFFT otherwise CFFT is calculated 00055 * \par 00056 * The parameter <code>bitReverseFlag</code> controls whether output is in normal order or bit reversed order. 00057 * Set(=1) bitReverseFlag for output to be in normal order otherwise output is in bit reversed order. 00058 * \par 00059 * The parameter <code>fftLen</code> Specifies length of CFFT/CIFFT process. Supported FFT Lengths are 16, 64, 256, 1024. 00060 * \par 00061 * This Function also initializes Twiddle factor table pointer and Bit reversal table pointer. 00062 */ 00063 00064 arm_status arm_cfft_radix4_init_f32( 00065 arm_cfft_radix4_instance_f32 * S, 00066 uint16_t fftLen, 00067 uint8_t ifftFlag, 00068 uint8_t bitReverseFlag) 00069 { 00070 /* Initialise the default arm status */ 00071 arm_status status = ARM_MATH_SUCCESS; 00072 00073 /* Initialise the FFT length */ 00074 S->fftLen = fftLen; 00075 00076 /* Initialise the Twiddle coefficient pointer */ 00077 S->pTwiddle = (float32_t *) twiddleCoef; 00078 00079 /* Initialise the Flag for selection of CFFT or CIFFT */ 00080 S->ifftFlag = ifftFlag; 00081 00082 /* Initialise the Flag for calculation Bit reversal or not */ 00083 S->bitReverseFlag = bitReverseFlag; 00084 00085 /* Initializations of structure parameters depending on the FFT length */ 00086 switch (S->fftLen) 00087 { 00088 00089 case 4096U: 00090 /* Initializations of structure parameters for 4096 point FFT */ 00091 00092 /* Initialise the twiddle coef modifier value */ 00093 S->twidCoefModifier = 1U; 00094 /* Initialise the bit reversal table modifier */ 00095 S->bitRevFactor = 1U; 00096 /* Initialise the bit reversal table pointer */ 00097 S->pBitRevTable = (uint16_t *) armBitRevTable ; 00098 /* Initialise the 1/fftLen Value */ 00099 S->onebyfftLen = 0.000244140625; 00100 break; 00101 00102 case 1024U: 00103 /* Initializations of structure parameters for 1024 point FFT */ 00104 00105 /* Initialise the twiddle coef modifier value */ 00106 S->twidCoefModifier = 4U; 00107 /* Initialise the bit reversal table modifier */ 00108 S->bitRevFactor = 4U; 00109 /* Initialise the bit reversal table pointer */ 00110 S->pBitRevTable = (uint16_t *) & armBitRevTable [3]; 00111 /* Initialise the 1/fftLen Value */ 00112 S->onebyfftLen = 0.0009765625f; 00113 break; 00114 00115 00116 case 256U: 00117 /* Initializations of structure parameters for 256 point FFT */ 00118 S->twidCoefModifier = 16U; 00119 S->bitRevFactor = 16U; 00120 S->pBitRevTable = (uint16_t *) & armBitRevTable [15]; 00121 S->onebyfftLen = 0.00390625f; 00122 break; 00123 00124 case 64U: 00125 /* Initializations of structure parameters for 64 point FFT */ 00126 S->twidCoefModifier = 64U; 00127 S->bitRevFactor = 64U; 00128 S->pBitRevTable = (uint16_t *) & armBitRevTable [63]; 00129 S->onebyfftLen = 0.015625f; 00130 break; 00131 00132 case 16U: 00133 /* Initializations of structure parameters for 16 point FFT */ 00134 S->twidCoefModifier = 256U; 00135 S->bitRevFactor = 256U; 00136 S->pBitRevTable = (uint16_t *) & armBitRevTable [255]; 00137 S->onebyfftLen = 0.0625f; 00138 break; 00139 00140 00141 default: 00142 /* Reporting argument error if fftSize is not valid value */ 00143 status = ARM_MATH_ARGUMENT_ERROR; 00144 break; 00145 } 00146 00147 return (status); 00148 } 00149 00150 /** 00151 * @} end of ComplexFFT group 00152 */ 00153
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