The CMSIS DSP 5 library
Dependents: Nucleo-Heart-Rate ejercicioVrms2 PROYECTOFINAL ejercicioVrms ... more
functions/TransformFunctions/arm_rfft_fast_init_f32.c@3:4098b9d3d571, 2018-06-21 (annotated)
- Committer:
- xorjoep
- Date:
- Thu Jun 21 11:56:27 2018 +0000
- Revision:
- 3:4098b9d3d571
- Parent:
- 1:24714b45cd1b
headers is a folder not a library
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
xorjoep | 1:24714b45cd1b | 1 | /* ---------------------------------------------------------------------- |
xorjoep | 1:24714b45cd1b | 2 | * Project: CMSIS DSP Library |
xorjoep | 1:24714b45cd1b | 3 | * Title: arm_cfft_init_f32.c |
xorjoep | 1:24714b45cd1b | 4 | * Description: Split Radix Decimation in Frequency CFFT Floating point processing function |
xorjoep | 1:24714b45cd1b | 5 | * |
xorjoep | 1:24714b45cd1b | 6 | * $Date: 27. January 2017 |
xorjoep | 1:24714b45cd1b | 7 | * $Revision: V.1.5.1 |
xorjoep | 1:24714b45cd1b | 8 | * |
xorjoep | 1:24714b45cd1b | 9 | * Target Processor: Cortex-M cores |
xorjoep | 1:24714b45cd1b | 10 | * -------------------------------------------------------------------- */ |
xorjoep | 1:24714b45cd1b | 11 | /* |
xorjoep | 1:24714b45cd1b | 12 | * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved. |
xorjoep | 1:24714b45cd1b | 13 | * |
xorjoep | 1:24714b45cd1b | 14 | * SPDX-License-Identifier: Apache-2.0 |
xorjoep | 1:24714b45cd1b | 15 | * |
xorjoep | 1:24714b45cd1b | 16 | * Licensed under the Apache License, Version 2.0 (the License); you may |
xorjoep | 1:24714b45cd1b | 17 | * not use this file except in compliance with the License. |
xorjoep | 1:24714b45cd1b | 18 | * You may obtain a copy of the License at |
xorjoep | 1:24714b45cd1b | 19 | * |
xorjoep | 1:24714b45cd1b | 20 | * www.apache.org/licenses/LICENSE-2.0 |
xorjoep | 1:24714b45cd1b | 21 | * |
xorjoep | 1:24714b45cd1b | 22 | * Unless required by applicable law or agreed to in writing, software |
xorjoep | 1:24714b45cd1b | 23 | * distributed under the License is distributed on an AS IS BASIS, WITHOUT |
xorjoep | 1:24714b45cd1b | 24 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
xorjoep | 1:24714b45cd1b | 25 | * See the License for the specific language governing permissions and |
xorjoep | 1:24714b45cd1b | 26 | * limitations under the License. |
xorjoep | 1:24714b45cd1b | 27 | */ |
xorjoep | 1:24714b45cd1b | 28 | |
xorjoep | 1:24714b45cd1b | 29 | #include "arm_math.h" |
xorjoep | 1:24714b45cd1b | 30 | #include "arm_common_tables.h" |
xorjoep | 1:24714b45cd1b | 31 | |
xorjoep | 1:24714b45cd1b | 32 | /** |
xorjoep | 1:24714b45cd1b | 33 | * @ingroup groupTransforms |
xorjoep | 1:24714b45cd1b | 34 | */ |
xorjoep | 1:24714b45cd1b | 35 | |
xorjoep | 1:24714b45cd1b | 36 | /** |
xorjoep | 1:24714b45cd1b | 37 | * @addtogroup RealFFT |
xorjoep | 1:24714b45cd1b | 38 | * @{ |
xorjoep | 1:24714b45cd1b | 39 | */ |
xorjoep | 1:24714b45cd1b | 40 | |
xorjoep | 1:24714b45cd1b | 41 | /** |
xorjoep | 1:24714b45cd1b | 42 | * @brief Initialization function for the floating-point real FFT. |
xorjoep | 1:24714b45cd1b | 43 | * @param[in,out] *S points to an arm_rfft_fast_instance_f32 structure. |
xorjoep | 1:24714b45cd1b | 44 | * @param[in] fftLen length of the Real Sequence. |
xorjoep | 1:24714b45cd1b | 45 | * @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. |
xorjoep | 1:24714b45cd1b | 46 | * |
xorjoep | 1:24714b45cd1b | 47 | * \par Description: |
xorjoep | 1:24714b45cd1b | 48 | * \par |
xorjoep | 1:24714b45cd1b | 49 | * The parameter <code>fftLen</code> Specifies length of RFFT/CIFFT process. Supported FFT Lengths are 32, 64, 128, 256, 512, 1024, 2048, 4096. |
xorjoep | 1:24714b45cd1b | 50 | * \par |
xorjoep | 1:24714b45cd1b | 51 | * This Function also initializes Twiddle factor table pointer and Bit reversal table pointer. |
xorjoep | 1:24714b45cd1b | 52 | */ |
xorjoep | 1:24714b45cd1b | 53 | arm_status arm_rfft_fast_init_f32( |
xorjoep | 1:24714b45cd1b | 54 | arm_rfft_fast_instance_f32 * S, |
xorjoep | 1:24714b45cd1b | 55 | uint16_t fftLen) |
xorjoep | 1:24714b45cd1b | 56 | { |
xorjoep | 1:24714b45cd1b | 57 | arm_cfft_instance_f32 * Sint; |
xorjoep | 1:24714b45cd1b | 58 | /* Initialise the default arm status */ |
xorjoep | 1:24714b45cd1b | 59 | arm_status status = ARM_MATH_SUCCESS; |
xorjoep | 1:24714b45cd1b | 60 | /* Initialise the FFT length */ |
xorjoep | 1:24714b45cd1b | 61 | Sint = &(S->Sint); |
xorjoep | 1:24714b45cd1b | 62 | Sint->fftLen = fftLen/2; |
xorjoep | 1:24714b45cd1b | 63 | S->fftLenRFFT = fftLen; |
xorjoep | 1:24714b45cd1b | 64 | |
xorjoep | 1:24714b45cd1b | 65 | /* Initializations of structure parameters depending on the FFT length */ |
xorjoep | 1:24714b45cd1b | 66 | switch (Sint->fftLen) |
xorjoep | 1:24714b45cd1b | 67 | { |
xorjoep | 1:24714b45cd1b | 68 | case 2048U: |
xorjoep | 1:24714b45cd1b | 69 | /* Initializations of structure parameters for 2048 point FFT */ |
xorjoep | 1:24714b45cd1b | 70 | /* Initialise the bit reversal table length */ |
xorjoep | 1:24714b45cd1b | 71 | Sint->bitRevLength = ARMBITREVINDEXTABLE_2048_TABLE_LENGTH; |
xorjoep | 1:24714b45cd1b | 72 | /* Initialise the bit reversal table pointer */ |
xorjoep | 1:24714b45cd1b | 73 | Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable2048; |
xorjoep | 1:24714b45cd1b | 74 | /* Initialise the Twiddle coefficient pointers */ |
xorjoep | 1:24714b45cd1b | 75 | Sint->pTwiddle = (float32_t *) twiddleCoef_2048; |
xorjoep | 1:24714b45cd1b | 76 | S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_4096; |
xorjoep | 1:24714b45cd1b | 77 | break; |
xorjoep | 1:24714b45cd1b | 78 | case 1024U: |
xorjoep | 1:24714b45cd1b | 79 | Sint->bitRevLength = ARMBITREVINDEXTABLE_1024_TABLE_LENGTH; |
xorjoep | 1:24714b45cd1b | 80 | Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable1024; |
xorjoep | 1:24714b45cd1b | 81 | Sint->pTwiddle = (float32_t *) twiddleCoef_1024; |
xorjoep | 1:24714b45cd1b | 82 | S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_2048; |
xorjoep | 1:24714b45cd1b | 83 | break; |
xorjoep | 1:24714b45cd1b | 84 | case 512U: |
xorjoep | 1:24714b45cd1b | 85 | Sint->bitRevLength = ARMBITREVINDEXTABLE_512_TABLE_LENGTH; |
xorjoep | 1:24714b45cd1b | 86 | Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable512; |
xorjoep | 1:24714b45cd1b | 87 | Sint->pTwiddle = (float32_t *) twiddleCoef_512; |
xorjoep | 1:24714b45cd1b | 88 | S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_1024; |
xorjoep | 1:24714b45cd1b | 89 | break; |
xorjoep | 1:24714b45cd1b | 90 | case 256U: |
xorjoep | 1:24714b45cd1b | 91 | Sint->bitRevLength = ARMBITREVINDEXTABLE_256_TABLE_LENGTH; |
xorjoep | 1:24714b45cd1b | 92 | Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable256; |
xorjoep | 1:24714b45cd1b | 93 | Sint->pTwiddle = (float32_t *) twiddleCoef_256; |
xorjoep | 1:24714b45cd1b | 94 | S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_512; |
xorjoep | 1:24714b45cd1b | 95 | break; |
xorjoep | 1:24714b45cd1b | 96 | case 128U: |
xorjoep | 1:24714b45cd1b | 97 | Sint->bitRevLength = ARMBITREVINDEXTABLE_128_TABLE_LENGTH; |
xorjoep | 1:24714b45cd1b | 98 | Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable128; |
xorjoep | 1:24714b45cd1b | 99 | Sint->pTwiddle = (float32_t *) twiddleCoef_128; |
xorjoep | 1:24714b45cd1b | 100 | S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_256; |
xorjoep | 1:24714b45cd1b | 101 | break; |
xorjoep | 1:24714b45cd1b | 102 | case 64U: |
xorjoep | 1:24714b45cd1b | 103 | Sint->bitRevLength = ARMBITREVINDEXTABLE_64_TABLE_LENGTH; |
xorjoep | 1:24714b45cd1b | 104 | Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable64; |
xorjoep | 1:24714b45cd1b | 105 | Sint->pTwiddle = (float32_t *) twiddleCoef_64; |
xorjoep | 1:24714b45cd1b | 106 | S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_128; |
xorjoep | 1:24714b45cd1b | 107 | break; |
xorjoep | 1:24714b45cd1b | 108 | case 32U: |
xorjoep | 1:24714b45cd1b | 109 | Sint->bitRevLength = ARMBITREVINDEXTABLE_32_TABLE_LENGTH; |
xorjoep | 1:24714b45cd1b | 110 | Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable32; |
xorjoep | 1:24714b45cd1b | 111 | Sint->pTwiddle = (float32_t *) twiddleCoef_32; |
xorjoep | 1:24714b45cd1b | 112 | S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_64; |
xorjoep | 1:24714b45cd1b | 113 | break; |
xorjoep | 1:24714b45cd1b | 114 | case 16U: |
xorjoep | 1:24714b45cd1b | 115 | Sint->bitRevLength = ARMBITREVINDEXTABLE_16_TABLE_LENGTH; |
xorjoep | 1:24714b45cd1b | 116 | Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable16; |
xorjoep | 1:24714b45cd1b | 117 | Sint->pTwiddle = (float32_t *) twiddleCoef_16; |
xorjoep | 1:24714b45cd1b | 118 | S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_32; |
xorjoep | 1:24714b45cd1b | 119 | break; |
xorjoep | 1:24714b45cd1b | 120 | default: |
xorjoep | 1:24714b45cd1b | 121 | /* Reporting argument error if fftSize is not valid value */ |
xorjoep | 1:24714b45cd1b | 122 | status = ARM_MATH_ARGUMENT_ERROR; |
xorjoep | 1:24714b45cd1b | 123 | break; |
xorjoep | 1:24714b45cd1b | 124 | } |
xorjoep | 1:24714b45cd1b | 125 | |
xorjoep | 1:24714b45cd1b | 126 | return (status); |
xorjoep | 1:24714b45cd1b | 127 | } |
xorjoep | 1:24714b45cd1b | 128 | |
xorjoep | 1:24714b45cd1b | 129 | /** |
xorjoep | 1:24714b45cd1b | 130 | * @} end of RealFFT group |
xorjoep | 1:24714b45cd1b | 131 | */ |