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

ControllerFunctions/arm_sin_cos_q31.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_sin_cos_q31.c
emh203 0:3d9c67d97d6f 9 *
emh203 0:3d9c67d97d6f 10 * Description: Cosine & Sine calculation for Q31 values.
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 groupController
emh203 0:3d9c67d97d6f 46 */
emh203 0:3d9c67d97d6f 47
emh203 0:3d9c67d97d6f 48 /**
emh203 0:3d9c67d97d6f 49 * @addtogroup SinCos
emh203 0:3d9c67d97d6f 50 * @{
emh203 0:3d9c67d97d6f 51 */
emh203 0:3d9c67d97d6f 52
emh203 0:3d9c67d97d6f 53 /**
emh203 0:3d9c67d97d6f 54 * @brief Q31 sin_cos function.
emh203 0:3d9c67d97d6f 55 * @param[in] theta scaled input value in degrees
emh203 0:3d9c67d97d6f 56 * @param[out] *pSinVal points to the processed sine output.
emh203 0:3d9c67d97d6f 57 * @param[out] *pCosVal points to the processed cosine output.
emh203 0:3d9c67d97d6f 58 * @return none.
emh203 0:3d9c67d97d6f 59 *
emh203 0:3d9c67d97d6f 60 * The Q31 input value is in the range [-1 0.999999] and is mapped to a degree value in the range [-180 179].
emh203 0:3d9c67d97d6f 61 *
emh203 0:3d9c67d97d6f 62 */
emh203 0:3d9c67d97d6f 63
emh203 0:3d9c67d97d6f 64 void arm_sin_cos_q31(
emh203 0:3d9c67d97d6f 65 q31_t theta,
emh203 0:3d9c67d97d6f 66 q31_t * pSinVal,
emh203 0:3d9c67d97d6f 67 q31_t * pCosVal)
emh203 0:3d9c67d97d6f 68 {
emh203 0:3d9c67d97d6f 69 q31_t fract; /* Temporary variables for input, output */
emh203 0:3d9c67d97d6f 70 uint16_t indexS, indexC; /* Index variable */
emh203 0:3d9c67d97d6f 71 q31_t f1, f2, d1, d2; /* Two nearest output values */
emh203 0:3d9c67d97d6f 72 q31_t Dn, Df;
emh203 0:3d9c67d97d6f 73 q63_t temp;
emh203 0:3d9c67d97d6f 74
emh203 0:3d9c67d97d6f 75 /* Calculate the nearest index */
emh203 0:3d9c67d97d6f 76 indexS = (uint32_t)theta >> CONTROLLER_Q31_SHIFT;
emh203 0:3d9c67d97d6f 77 indexC = (indexS + 128) & 0x1ff;
emh203 0:3d9c67d97d6f 78
emh203 0:3d9c67d97d6f 79 /* Calculation of fractional value */
emh203 0:3d9c67d97d6f 80 fract = (theta - (indexS << CONTROLLER_Q31_SHIFT)) << 8;
emh203 0:3d9c67d97d6f 81
emh203 0:3d9c67d97d6f 82 /* Read two nearest values of input value from the cos & sin tables */
emh203 0:3d9c67d97d6f 83 f1 = sinTable_q31[indexC+0];
emh203 0:3d9c67d97d6f 84 f2 = sinTable_q31[indexC+1];
emh203 0:3d9c67d97d6f 85 d1 = -sinTable_q31[indexS+0];
emh203 0:3d9c67d97d6f 86 d2 = -sinTable_q31[indexS+1];
emh203 0:3d9c67d97d6f 87
emh203 0:3d9c67d97d6f 88 Dn = 0x1921FB5; // delta between the two points (fixed), in this case 2*pi/FAST_MATH_TABLE_SIZE
emh203 0:3d9c67d97d6f 89 Df = f2 - f1; // delta between the values of the functions
emh203 0:3d9c67d97d6f 90 temp = Dn*((q63_t)d1 + d2);
emh203 0:3d9c67d97d6f 91 temp = temp - ((q63_t)Df << 32);
emh203 0:3d9c67d97d6f 92 temp = (q63_t)fract*(temp >> 31);
emh203 0:3d9c67d97d6f 93 temp = temp + ((3*(q63_t)Df << 31) - (d2 + ((q63_t)d1 << 1))*Dn);
emh203 0:3d9c67d97d6f 94 temp = (q63_t)fract*(temp >> 31);
emh203 0:3d9c67d97d6f 95 temp = temp + (q63_t)d1*Dn;
emh203 0:3d9c67d97d6f 96 temp = (q63_t)fract*(temp >> 31);
emh203 0:3d9c67d97d6f 97
emh203 0:3d9c67d97d6f 98 /* Calculation of cosine value */
emh203 0:3d9c67d97d6f 99 *pCosVal = clip_q63_to_q31((temp >> 31) + (q63_t)f1);
emh203 0:3d9c67d97d6f 100
emh203 0:3d9c67d97d6f 101 /* Read two nearest values of input value from the cos & sin tables */
emh203 0:3d9c67d97d6f 102 f1 = sinTable_q31[indexS+0];
emh203 0:3d9c67d97d6f 103 f2 = sinTable_q31[indexS+1];
emh203 0:3d9c67d97d6f 104 d1 = sinTable_q31[indexC+0];
emh203 0:3d9c67d97d6f 105 d2 = sinTable_q31[indexC+1];
emh203 0:3d9c67d97d6f 106
emh203 0:3d9c67d97d6f 107 Df = f2 - f1; // delta between the values of the functions
emh203 0:3d9c67d97d6f 108 temp = Dn*((q63_t)d1 + d2);
emh203 0:3d9c67d97d6f 109 temp = temp - ((q63_t)Df << 32);
emh203 0:3d9c67d97d6f 110 temp = (q63_t)fract*(temp >> 31);
emh203 0:3d9c67d97d6f 111 temp = temp + ((3*(q63_t)Df << 31) - (d2 + ((q63_t)d1 << 1))*Dn);
emh203 0:3d9c67d97d6f 112 temp = (q63_t)fract*(temp >> 31);
emh203 0:3d9c67d97d6f 113 temp = temp + (q63_t)d1*Dn;
emh203 0:3d9c67d97d6f 114 temp = (q63_t)fract*(temp >> 31);
emh203 0:3d9c67d97d6f 115
emh203 0:3d9c67d97d6f 116 /* Calculation of sine value */
emh203 0:3d9c67d97d6f 117 *pSinVal = clip_q63_to_q31((temp >> 31) + (q63_t)f1);
emh203 0:3d9c67d97d6f 118 }
emh203 0:3d9c67d97d6f 119
emh203 0:3d9c67d97d6f 120 /**
emh203 0:3d9c67d97d6f 121 * @} end of SinCos group
emh203 0:3d9c67d97d6f 122 */