1 /****************************************************************************** 2 * @file transform_functions_f16.h 3 * @brief Public header file for CMSIS DSP Library 4 * @version V1.9.0 5 * @date 23 April 2021 6 * Target Processor: Cortex-M and Cortex-A cores 7 ******************************************************************************/ 8 /* 9 * Copyright (c) 2010-2020 Arm Limited or its affiliates. All rights reserved. 10 * 11 * SPDX-License-Identifier: Apache-2.0 12 * 13 * Licensed under the Apache License, Version 2.0 (the License); you may 14 * not use this file except in compliance with the License. 15 * You may obtain a copy of the License at 16 * 17 * www.apache.org/licenses/LICENSE-2.0 18 * 19 * Unless required by applicable law or agreed to in writing, software 20 * distributed under the License is distributed on an AS IS BASIS, WITHOUT 21 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 22 * See the License for the specific language governing permissions and 23 * limitations under the License. 24 */ 25 26 27 #ifndef _TRANSFORM_FUNCTIONS_F16_H_ 28 #define _TRANSFORM_FUNCTIONS_F16_H_ 29 30 #include "arm_math_types_f16.h" 31 #include "arm_math_memory.h" 32 33 #include "dsp/none.h" 34 #include "dsp/utils.h" 35 36 #ifdef __cplusplus 37 extern "C" 38 { 39 #endif 40 41 42 43 #if defined(ARM_FLOAT16_SUPPORTED) 44 45 46 /** 47 * @brief Instance structure for the floating-point CFFT/CIFFT function. 48 */ 49 typedef struct 50 { 51 uint16_t fftLen; /**< length of the FFT. */ 52 uint8_t ifftFlag; /**< flag that selects forward (ifftFlag=0) or inverse (ifftFlag=1) transform. */ 53 uint8_t bitReverseFlag; /**< flag that enables (bitReverseFlag=1) or disables (bitReverseFlag=0) bit reversal of output. */ 54 const float16_t *pTwiddle; /**< points to the Twiddle factor table. */ 55 const uint16_t *pBitRevTable; /**< points to the bit reversal table. */ 56 uint16_t twidCoefModifier; /**< twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table. */ 57 uint16_t bitRevFactor; /**< bit reversal modifier that supports different size FFTs with the same bit reversal table. */ 58 float16_t onebyfftLen; /**< value of 1/fftLen. */ 59 } arm_cfft_radix2_instance_f16; 60 61 /** 62 * @brief Instance structure for the floating-point CFFT/CIFFT function. 63 */ 64 typedef struct 65 { 66 uint16_t fftLen; /**< length of the FFT. */ 67 uint8_t ifftFlag; /**< flag that selects forward (ifftFlag=0) or inverse (ifftFlag=1) transform. */ 68 uint8_t bitReverseFlag; /**< flag that enables (bitReverseFlag=1) or disables (bitReverseFlag=0) bit reversal of output. */ 69 const float16_t *pTwiddle; /**< points to the Twiddle factor table. */ 70 const uint16_t *pBitRevTable; /**< points to the bit reversal table. */ 71 uint16_t twidCoefModifier; /**< twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table. */ 72 uint16_t bitRevFactor; /**< bit reversal modifier that supports different size FFTs with the same bit reversal table. */ 73 float16_t onebyfftLen; /**< value of 1/fftLen. */ 74 } arm_cfft_radix4_instance_f16; 75 76 /** 77 * @brief Instance structure for the floating-point CFFT/CIFFT function. 78 */ 79 typedef struct 80 { 81 uint16_t fftLen; /**< length of the FFT. */ 82 const float16_t *pTwiddle; /**< points to the Twiddle factor table. */ 83 const uint16_t *pBitRevTable; /**< points to the bit reversal table. */ 84 uint16_t bitRevLength; /**< bit reversal table length. */ 85 #if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) 86 const uint32_t *rearranged_twiddle_tab_stride1_arr; /**< Per stage reordered twiddle pointer (offset 1) */ \ 87 const uint32_t *rearranged_twiddle_tab_stride2_arr; /**< Per stage reordered twiddle pointer (offset 2) */ \ 88 const uint32_t *rearranged_twiddle_tab_stride3_arr; /**< Per stage reordered twiddle pointer (offset 3) */ \ 89 const float16_t *rearranged_twiddle_stride1; /**< reordered twiddle offset 1 storage */ \ 90 const float16_t *rearranged_twiddle_stride2; /**< reordered twiddle offset 2 storage */ \ 91 const float16_t *rearranged_twiddle_stride3; 92 #endif 93 } arm_cfft_instance_f16; 94 95 96 arm_status arm_cfft_init_f16( 97 arm_cfft_instance_f16 * S, 98 uint16_t fftLen); 99 100 void arm_cfft_f16( 101 const arm_cfft_instance_f16 * S, 102 float16_t * p1, 103 uint8_t ifftFlag, 104 uint8_t bitReverseFlag); 105 106 /** 107 * @brief Instance structure for the floating-point RFFT/RIFFT function. 108 */ 109 typedef struct 110 { 111 arm_cfft_instance_f16 Sint; /**< Internal CFFT structure. */ 112 uint16_t fftLenRFFT; /**< length of the real sequence */ 113 const float16_t * pTwiddleRFFT; /**< Twiddle factors real stage */ 114 } arm_rfft_fast_instance_f16 ; 115 116 arm_status arm_rfft_fast_init_f16 ( 117 arm_rfft_fast_instance_f16 * S, 118 uint16_t fftLen); 119 120 121 void arm_rfft_fast_f16( 122 const arm_rfft_fast_instance_f16 * S, 123 float16_t * p, float16_t * pOut, 124 uint8_t ifftFlag); 125 126 /* Deprecated */ 127 arm_status arm_cfft_radix4_init_f16( 128 arm_cfft_radix4_instance_f16 * S, 129 uint16_t fftLen, 130 uint8_t ifftFlag, 131 uint8_t bitReverseFlag); 132 133 /* Deprecated */ 134 void arm_cfft_radix4_f16( 135 const arm_cfft_radix4_instance_f16 * S, 136 float16_t * pSrc); 137 138 139 /* Deprecated */ 140 arm_status arm_cfft_radix2_init_f16( 141 arm_cfft_radix2_instance_f16 * S, 142 uint16_t fftLen, 143 uint8_t ifftFlag, 144 uint8_t bitReverseFlag); 145 146 /* Deprecated */ 147 void arm_cfft_radix2_f16( 148 const arm_cfft_radix2_instance_f16 * S, 149 float16_t * pSrc); 150 151 #endif /* defined(ARM_FLOAT16_SUPPORTED)*/ 152 153 #ifdef __cplusplus 154 } 155 #endif 156 157 #endif /* ifndef _TRANSFORM_FUNCTIONS_F16_H_ */ 158
