Eli Hughes / CMSIS_DSP_401

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_cfft_radix4_init_q15.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?

UserRevisionLine numberNew contents of line
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_radix4_init_q15.c
emh203 0:3d9c67d97d6f 9 *
emh203 0:3d9c67d97d6f 10 * Description: Radix-4 Decimation in Frequency Q15 FFT & IFFT initialization 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 /**
emh203 0:3d9c67d97d6f 50 * @addtogroup ComplexFFT
emh203 0:3d9c67d97d6f 51 * @{
emh203 0:3d9c67d97d6f 52 */
emh203 0:3d9c67d97d6f 53
emh203 0:3d9c67d97d6f 54
emh203 0:3d9c67d97d6f 55 /**
emh203 0:3d9c67d97d6f 56 * @brief Initialization function for the Q15 CFFT/CIFFT.
emh203 0:3d9c67d97d6f 57 * @param[in,out] *S points to an instance of the Q15 CFFT/CIFFT structure.
emh203 0:3d9c67d97d6f 58 * @param[in] fftLen length of the FFT.
emh203 0:3d9c67d97d6f 59 * @param[in] ifftFlag flag that selects forward (ifftFlag=0) or inverse (ifftFlag=1) transform.
emh203 0:3d9c67d97d6f 60 * @param[in] bitReverseFlag flag that enables (bitReverseFlag=1) or disables (bitReverseFlag=0) bit reversal of output.
emh203 0:3d9c67d97d6f 61 * @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 62 *
emh203 0:3d9c67d97d6f 63 * \par Description:
emh203 0:3d9c67d97d6f 64 * \par
emh203 0:3d9c67d97d6f 65 * The parameter <code>ifftFlag</code> controls whether a forward or inverse transform is computed.
emh203 0:3d9c67d97d6f 66 * Set(=1) ifftFlag for calculation of CIFFT otherwise CFFT is calculated
emh203 0:3d9c67d97d6f 67 * \par
emh203 0:3d9c67d97d6f 68 * The parameter <code>bitReverseFlag</code> controls whether output is in normal order or bit reversed order.
emh203 0:3d9c67d97d6f 69 * Set(=1) bitReverseFlag for output to be in normal order otherwise output is in bit reversed order.
emh203 0:3d9c67d97d6f 70 * \par
emh203 0:3d9c67d97d6f 71 * The parameter <code>fftLen</code> Specifies length of CFFT/CIFFT process. Supported FFT Lengths are 16, 64, 256, 1024.
emh203 0:3d9c67d97d6f 72 * \par
emh203 0:3d9c67d97d6f 73 * This Function also initializes Twiddle factor table pointer and Bit reversal table pointer.
emh203 0:3d9c67d97d6f 74 */
emh203 0:3d9c67d97d6f 75
emh203 0:3d9c67d97d6f 76 arm_status arm_cfft_radix4_init_q15(
emh203 0:3d9c67d97d6f 77 arm_cfft_radix4_instance_q15 * S,
emh203 0:3d9c67d97d6f 78 uint16_t fftLen,
emh203 0:3d9c67d97d6f 79 uint8_t ifftFlag,
emh203 0:3d9c67d97d6f 80 uint8_t bitReverseFlag)
emh203 0:3d9c67d97d6f 81 {
emh203 0:3d9c67d97d6f 82 /* Initialise the default arm status */
emh203 0:3d9c67d97d6f 83 arm_status status = ARM_MATH_SUCCESS;
emh203 0:3d9c67d97d6f 84 /* Initialise the FFT length */
emh203 0:3d9c67d97d6f 85 S->fftLen = fftLen;
emh203 0:3d9c67d97d6f 86 /* Initialise the Twiddle coefficient pointer */
emh203 0:3d9c67d97d6f 87 S->pTwiddle = (q15_t *) twiddleCoefQ15;
emh203 0:3d9c67d97d6f 88 /* Initialise the Flag for selection of CFFT or CIFFT */
emh203 0:3d9c67d97d6f 89 S->ifftFlag = ifftFlag;
emh203 0:3d9c67d97d6f 90 /* Initialise the Flag for calculation Bit reversal or not */
emh203 0:3d9c67d97d6f 91 S->bitReverseFlag = bitReverseFlag;
emh203 0:3d9c67d97d6f 92
emh203 0:3d9c67d97d6f 93 /* Initializations of structure parameters depending on the FFT length */
emh203 0:3d9c67d97d6f 94 switch (S->fftLen)
emh203 0:3d9c67d97d6f 95 {
emh203 0:3d9c67d97d6f 96 case 4096u:
emh203 0:3d9c67d97d6f 97 /* Initializations of structure parameters for 4096 point FFT */
emh203 0:3d9c67d97d6f 98
emh203 0:3d9c67d97d6f 99 /* Initialise the twiddle coef modifier value */
emh203 0:3d9c67d97d6f 100 S->twidCoefModifier = 1u;
emh203 0:3d9c67d97d6f 101 /* Initialise the bit reversal table modifier */
emh203 0:3d9c67d97d6f 102 S->bitRevFactor = 1u;
emh203 0:3d9c67d97d6f 103 /* Initialise the bit reversal table pointer */
emh203 0:3d9c67d97d6f 104 S->pBitRevTable = (uint16_t *) armBitRevTable;
emh203 0:3d9c67d97d6f 105
emh203 0:3d9c67d97d6f 106 break;
emh203 0:3d9c67d97d6f 107
emh203 0:3d9c67d97d6f 108 case 1024u:
emh203 0:3d9c67d97d6f 109 /* Initializations of structure parameters for 1024 point FFT */
emh203 0:3d9c67d97d6f 110 S->twidCoefModifier = 4u;
emh203 0:3d9c67d97d6f 111 S->bitRevFactor = 4u;
emh203 0:3d9c67d97d6f 112 S->pBitRevTable = (uint16_t *) & armBitRevTable[3];
emh203 0:3d9c67d97d6f 113
emh203 0:3d9c67d97d6f 114 break;
emh203 0:3d9c67d97d6f 115
emh203 0:3d9c67d97d6f 116 case 256u:
emh203 0:3d9c67d97d6f 117 /* Initializations of structure parameters for 256 point FFT */
emh203 0:3d9c67d97d6f 118 S->twidCoefModifier = 16u;
emh203 0:3d9c67d97d6f 119 S->bitRevFactor = 16u;
emh203 0:3d9c67d97d6f 120 S->pBitRevTable = (uint16_t *) & armBitRevTable[15];
emh203 0:3d9c67d97d6f 121
emh203 0:3d9c67d97d6f 122 break;
emh203 0:3d9c67d97d6f 123
emh203 0:3d9c67d97d6f 124 case 64u:
emh203 0:3d9c67d97d6f 125 /* Initializations of structure parameters for 64 point FFT */
emh203 0:3d9c67d97d6f 126 S->twidCoefModifier = 64u;
emh203 0:3d9c67d97d6f 127 S->bitRevFactor = 64u;
emh203 0:3d9c67d97d6f 128 S->pBitRevTable = (uint16_t *) & armBitRevTable[63];
emh203 0:3d9c67d97d6f 129
emh203 0:3d9c67d97d6f 130 break;
emh203 0:3d9c67d97d6f 131
emh203 0:3d9c67d97d6f 132 case 16u:
emh203 0:3d9c67d97d6f 133 /* Initializations of structure parameters for 16 point FFT */
emh203 0:3d9c67d97d6f 134 S->twidCoefModifier = 256u;
emh203 0:3d9c67d97d6f 135 S->bitRevFactor = 256u;
emh203 0:3d9c67d97d6f 136 S->pBitRevTable = (uint16_t *) & armBitRevTable[255];
emh203 0:3d9c67d97d6f 137
emh203 0:3d9c67d97d6f 138 break;
emh203 0:3d9c67d97d6f 139
emh203 0:3d9c67d97d6f 140 default:
emh203 0:3d9c67d97d6f 141 /* Reporting argument error if fftSize is not valid value */
emh203 0:3d9c67d97d6f 142 status = ARM_MATH_ARGUMENT_ERROR;
emh203 0:3d9c67d97d6f 143 break;
emh203 0:3d9c67d97d6f 144 }
emh203 0:3d9c67d97d6f 145
emh203 0:3d9c67d97d6f 146 return (status);
emh203 0:3d9c67d97d6f 147 }
emh203 0:3d9c67d97d6f 148
emh203 0:3d9c67d97d6f 149 /**
emh203 0:3d9c67d97d6f 150 * @} end of ComplexFFT group
emh203 0:3d9c67d97d6f 151 */