V4.0.1 of the ARM CMSIS DSP libraries. Note that arm_bitreversal2.s, arm_cfft_f32.c and arm_rfft_fast_f32.c had to be removed. arm_bitreversal2.s will not assemble with the online tools. So, the fast f32 FFT functions are not yet available. All the other FFT functions are available.
Dependents: MPU9150_Example fir_f32 fir_f32 MPU9150_nucleo_noni2cdev ... more
TransformFunctions/arm_rfft_fast_init_f32.c@0:3d9c67d97d6f, 2014-07-28 (annotated)
- Committer:
- emh203
- Date:
- Mon Jul 28 15:03:15 2014 +0000
- Revision:
- 0:3d9c67d97d6f
1st working commit. Had to remove arm_bitreversal2.s arm_cfft_f32.c and arm_rfft_fast_f32.c. The .s will not assemble. For now I removed these functions so we could at least have a library for the other functions.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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emh203 | 0:3d9c67d97d6f | 1 | /* ---------------------------------------------------------------------- |
emh203 | 0:3d9c67d97d6f | 2 | * Copyright (C) 2010-2014 ARM Limited. All rights reserved. |
emh203 | 0:3d9c67d97d6f | 3 | * |
emh203 | 0:3d9c67d97d6f | 4 | * $Date: 12. March 2014 |
emh203 | 0:3d9c67d97d6f | 5 | * $Revision: V1.4.3 |
emh203 | 0:3d9c67d97d6f | 6 | * |
emh203 | 0:3d9c67d97d6f | 7 | * Project: CMSIS DSP Library |
emh203 | 0:3d9c67d97d6f | 8 | * Title: arm_cfft_init_f32.c |
emh203 | 0:3d9c67d97d6f | 9 | * |
emh203 | 0:3d9c67d97d6f | 10 | * Description: Split Radix Decimation in Frequency CFFT Floating point processing function |
emh203 | 0:3d9c67d97d6f | 11 | * |
emh203 | 0:3d9c67d97d6f | 12 | * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 |
emh203 | 0:3d9c67d97d6f | 13 | * |
emh203 | 0:3d9c67d97d6f | 14 | * Redistribution and use in source and binary forms, with or without |
emh203 | 0:3d9c67d97d6f | 15 | * modification, are permitted provided that the following conditions |
emh203 | 0:3d9c67d97d6f | 16 | * are met: |
emh203 | 0:3d9c67d97d6f | 17 | * - Redistributions of source code must retain the above copyright |
emh203 | 0:3d9c67d97d6f | 18 | * notice, this list of conditions and the following disclaimer. |
emh203 | 0:3d9c67d97d6f | 19 | * - Redistributions in binary form must reproduce the above copyright |
emh203 | 0:3d9c67d97d6f | 20 | * notice, this list of conditions and the following disclaimer in |
emh203 | 0:3d9c67d97d6f | 21 | * the documentation and/or other materials provided with the |
emh203 | 0:3d9c67d97d6f | 22 | * distribution. |
emh203 | 0:3d9c67d97d6f | 23 | * - Neither the name of ARM LIMITED nor the names of its contributors |
emh203 | 0:3d9c67d97d6f | 24 | * may be used to endorse or promote products derived from this |
emh203 | 0:3d9c67d97d6f | 25 | * software without specific prior written permission. |
emh203 | 0:3d9c67d97d6f | 26 | * |
emh203 | 0:3d9c67d97d6f | 27 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
emh203 | 0:3d9c67d97d6f | 28 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
emh203 | 0:3d9c67d97d6f | 29 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
emh203 | 0:3d9c67d97d6f | 30 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
emh203 | 0:3d9c67d97d6f | 31 | * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
emh203 | 0:3d9c67d97d6f | 32 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
emh203 | 0:3d9c67d97d6f | 33 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
emh203 | 0:3d9c67d97d6f | 34 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
emh203 | 0:3d9c67d97d6f | 35 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
emh203 | 0:3d9c67d97d6f | 36 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
emh203 | 0:3d9c67d97d6f | 37 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
emh203 | 0:3d9c67d97d6f | 38 | * POSSIBILITY OF SUCH DAMAGE. |
emh203 | 0:3d9c67d97d6f | 39 | * -------------------------------------------------------------------- */ |
emh203 | 0:3d9c67d97d6f | 40 | |
emh203 | 0:3d9c67d97d6f | 41 | #include "arm_math.h" |
emh203 | 0:3d9c67d97d6f | 42 | #include "arm_common_tables.h" |
emh203 | 0:3d9c67d97d6f | 43 | |
emh203 | 0:3d9c67d97d6f | 44 | /** |
emh203 | 0:3d9c67d97d6f | 45 | * @ingroup groupTransforms |
emh203 | 0:3d9c67d97d6f | 46 | */ |
emh203 | 0:3d9c67d97d6f | 47 | |
emh203 | 0:3d9c67d97d6f | 48 | /** |
emh203 | 0:3d9c67d97d6f | 49 | * @addtogroup RealFFT |
emh203 | 0:3d9c67d97d6f | 50 | * @{ |
emh203 | 0:3d9c67d97d6f | 51 | */ |
emh203 | 0:3d9c67d97d6f | 52 | |
emh203 | 0:3d9c67d97d6f | 53 | /** |
emh203 | 0:3d9c67d97d6f | 54 | * @brief Initialization function for the floating-point real FFT. |
emh203 | 0:3d9c67d97d6f | 55 | * @param[in,out] *S points to an arm_rfft_fast_instance_f32 structure. |
emh203 | 0:3d9c67d97d6f | 56 | * @param[in] fftLen length of the Real Sequence. |
emh203 | 0:3d9c67d97d6f | 57 | * @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. |
emh203 | 0:3d9c67d97d6f | 58 | * |
emh203 | 0:3d9c67d97d6f | 59 | * \par Description: |
emh203 | 0:3d9c67d97d6f | 60 | * \par |
emh203 | 0:3d9c67d97d6f | 61 | * The parameter <code>ifftFlag</code> controls whether a forward or inverse transform is computed. |
emh203 | 0:3d9c67d97d6f | 62 | * Set(=1) ifftFlag for calculation of CIFFT otherwise RFFT is calculated |
emh203 | 0:3d9c67d97d6f | 63 | * \par |
emh203 | 0:3d9c67d97d6f | 64 | * The parameter <code>bitReverseFlag</code> controls whether output is in normal order or bit reversed order. |
emh203 | 0:3d9c67d97d6f | 65 | * Set(=1) bitReverseFlag for output to be in normal order otherwise output is in bit reversed order. |
emh203 | 0:3d9c67d97d6f | 66 | * \par |
emh203 | 0:3d9c67d97d6f | 67 | * The parameter <code>fftLen</code> Specifies length of RFFT/CIFFT process. Supported FFT Lengths are 16, 32, 64, 128, 256, 512, 1024, 2048, 4096. |
emh203 | 0:3d9c67d97d6f | 68 | * \par |
emh203 | 0:3d9c67d97d6f | 69 | * This Function also initializes Twiddle factor table pointer and Bit reversal table pointer. |
emh203 | 0:3d9c67d97d6f | 70 | */ |
emh203 | 0:3d9c67d97d6f | 71 | arm_status arm_rfft_fast_init_f32( |
emh203 | 0:3d9c67d97d6f | 72 | arm_rfft_fast_instance_f32 * S, |
emh203 | 0:3d9c67d97d6f | 73 | uint16_t fftLen) |
emh203 | 0:3d9c67d97d6f | 74 | { |
emh203 | 0:3d9c67d97d6f | 75 | arm_cfft_instance_f32 * Sint; |
emh203 | 0:3d9c67d97d6f | 76 | /* Initialise the default arm status */ |
emh203 | 0:3d9c67d97d6f | 77 | arm_status status = ARM_MATH_SUCCESS; |
emh203 | 0:3d9c67d97d6f | 78 | /* Initialise the FFT length */ |
emh203 | 0:3d9c67d97d6f | 79 | Sint = &(S->Sint); |
emh203 | 0:3d9c67d97d6f | 80 | Sint->fftLen = fftLen/2; |
emh203 | 0:3d9c67d97d6f | 81 | S->fftLenRFFT = fftLen; |
emh203 | 0:3d9c67d97d6f | 82 | |
emh203 | 0:3d9c67d97d6f | 83 | /* Initializations of structure parameters depending on the FFT length */ |
emh203 | 0:3d9c67d97d6f | 84 | switch (Sint->fftLen) |
emh203 | 0:3d9c67d97d6f | 85 | { |
emh203 | 0:3d9c67d97d6f | 86 | case 2048u: |
emh203 | 0:3d9c67d97d6f | 87 | /* Initializations of structure parameters for 2048 point FFT */ |
emh203 | 0:3d9c67d97d6f | 88 | /* Initialise the bit reversal table length */ |
emh203 | 0:3d9c67d97d6f | 89 | Sint->bitRevLength = ARMBITREVINDEXTABLE2048_TABLE_LENGTH; |
emh203 | 0:3d9c67d97d6f | 90 | /* Initialise the bit reversal table pointer */ |
emh203 | 0:3d9c67d97d6f | 91 | Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable2048; |
emh203 | 0:3d9c67d97d6f | 92 | /* Initialise the Twiddle coefficient pointers */ |
emh203 | 0:3d9c67d97d6f | 93 | Sint->pTwiddle = (float32_t *) twiddleCoef_2048; |
emh203 | 0:3d9c67d97d6f | 94 | S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_4096; |
emh203 | 0:3d9c67d97d6f | 95 | break; |
emh203 | 0:3d9c67d97d6f | 96 | case 1024u: |
emh203 | 0:3d9c67d97d6f | 97 | Sint->bitRevLength = ARMBITREVINDEXTABLE1024_TABLE_LENGTH; |
emh203 | 0:3d9c67d97d6f | 98 | Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable1024; |
emh203 | 0:3d9c67d97d6f | 99 | Sint->pTwiddle = (float32_t *) twiddleCoef_1024; |
emh203 | 0:3d9c67d97d6f | 100 | S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_2048; |
emh203 | 0:3d9c67d97d6f | 101 | break; |
emh203 | 0:3d9c67d97d6f | 102 | case 512u: |
emh203 | 0:3d9c67d97d6f | 103 | Sint->bitRevLength = ARMBITREVINDEXTABLE_512_TABLE_LENGTH; |
emh203 | 0:3d9c67d97d6f | 104 | Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable512; |
emh203 | 0:3d9c67d97d6f | 105 | Sint->pTwiddle = (float32_t *) twiddleCoef_512; |
emh203 | 0:3d9c67d97d6f | 106 | S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_1024; |
emh203 | 0:3d9c67d97d6f | 107 | break; |
emh203 | 0:3d9c67d97d6f | 108 | case 256u: |
emh203 | 0:3d9c67d97d6f | 109 | Sint->bitRevLength = ARMBITREVINDEXTABLE_256_TABLE_LENGTH; |
emh203 | 0:3d9c67d97d6f | 110 | Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable256; |
emh203 | 0:3d9c67d97d6f | 111 | Sint->pTwiddle = (float32_t *) twiddleCoef_256; |
emh203 | 0:3d9c67d97d6f | 112 | S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_512; |
emh203 | 0:3d9c67d97d6f | 113 | break; |
emh203 | 0:3d9c67d97d6f | 114 | case 128u: |
emh203 | 0:3d9c67d97d6f | 115 | Sint->bitRevLength = ARMBITREVINDEXTABLE_128_TABLE_LENGTH; |
emh203 | 0:3d9c67d97d6f | 116 | Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable128; |
emh203 | 0:3d9c67d97d6f | 117 | Sint->pTwiddle = (float32_t *) twiddleCoef_128; |
emh203 | 0:3d9c67d97d6f | 118 | S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_256; |
emh203 | 0:3d9c67d97d6f | 119 | break; |
emh203 | 0:3d9c67d97d6f | 120 | case 64u: |
emh203 | 0:3d9c67d97d6f | 121 | Sint->bitRevLength = ARMBITREVINDEXTABLE__64_TABLE_LENGTH; |
emh203 | 0:3d9c67d97d6f | 122 | Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable64; |
emh203 | 0:3d9c67d97d6f | 123 | Sint->pTwiddle = (float32_t *) twiddleCoef_64; |
emh203 | 0:3d9c67d97d6f | 124 | S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_128; |
emh203 | 0:3d9c67d97d6f | 125 | break; |
emh203 | 0:3d9c67d97d6f | 126 | case 32u: |
emh203 | 0:3d9c67d97d6f | 127 | Sint->bitRevLength = ARMBITREVINDEXTABLE__32_TABLE_LENGTH; |
emh203 | 0:3d9c67d97d6f | 128 | Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable32; |
emh203 | 0:3d9c67d97d6f | 129 | Sint->pTwiddle = (float32_t *) twiddleCoef_32; |
emh203 | 0:3d9c67d97d6f | 130 | S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_64; |
emh203 | 0:3d9c67d97d6f | 131 | break; |
emh203 | 0:3d9c67d97d6f | 132 | case 16u: |
emh203 | 0:3d9c67d97d6f | 133 | Sint->bitRevLength = ARMBITREVINDEXTABLE__16_TABLE_LENGTH; |
emh203 | 0:3d9c67d97d6f | 134 | Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable16; |
emh203 | 0:3d9c67d97d6f | 135 | Sint->pTwiddle = (float32_t *) twiddleCoef_16; |
emh203 | 0:3d9c67d97d6f | 136 | S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_32; |
emh203 | 0:3d9c67d97d6f | 137 | break; |
emh203 | 0:3d9c67d97d6f | 138 | default: |
emh203 | 0:3d9c67d97d6f | 139 | /* Reporting argument error if fftSize is not valid value */ |
emh203 | 0:3d9c67d97d6f | 140 | status = ARM_MATH_ARGUMENT_ERROR; |
emh203 | 0:3d9c67d97d6f | 141 | break; |
emh203 | 0:3d9c67d97d6f | 142 | } |
emh203 | 0:3d9c67d97d6f | 143 | |
emh203 | 0:3d9c67d97d6f | 144 | return (status); |
emh203 | 0:3d9c67d97d6f | 145 | } |
emh203 | 0:3d9c67d97d6f | 146 | |
emh203 | 0:3d9c67d97d6f | 147 | /** |
emh203 | 0:3d9c67d97d6f | 148 | * @} end of RealFFT group |
emh203 | 0:3d9c67d97d6f | 149 | */ |