Fork of mbed-dsp. CMSIS-DSP library of supporting NEON
Dependents: mbed-os-example-cmsis_dsp_neon
Fork of mbed-dsp by
Information
Japanese version is available in lower part of this page.
このページの後半に日本語版が用意されています.
CMSIS-DSP of supporting NEON
What is this ?
A library for CMSIS-DSP of supporting NEON.
We supported the NEON to CMSIS-DSP Ver1.4.3(CMSIS V4.1) that ARM supplied, has achieved the processing speed improvement.
If you use the mbed-dsp library, you can use to replace this library.
CMSIS-DSP of supporting NEON is provied as a library.
Library Creation environment
CMSIS-DSP library of supporting NEON was created by the following environment.
- Compiler
ARMCC Version 5.03 - Compile option switch[C Compiler]
-DARM_MATH_MATRIX_CHECK -DARM_MATH_ROUNDING -O3 -Otime --cpu=Cortex-A9 --littleend --arm --apcs=/interwork --no_unaligned_access --fpu=vfpv3_fp16 --fpmode=fast --apcs=/hardfp --vectorize --asm
- Compile option switch[Assembler]
--cpreproc --cpu=Cortex-A9 --littleend --arm --apcs=/interwork --no_unaligned_access --fpu=vfpv3_fp16 --fpmode=fast --apcs=/hardfp
Effects of NEON support
In the data which passes to each function, large size will be expected more effective than small size.
Also if the data is a multiple of 16, effect will be expected in every function in the CMSIS-DSP.
NEON対応CMSIS-DSP
概要
NEON対応したCMSIS-DSPのライブラリです。
ARM社提供のCMSIS-DSP Ver1.4.3(CMSIS V4.1)をターゲットにNEON対応を行ない、処理速度向上を実現しております。
mbed-dspライブラリを使用している場合は、本ライブラリに置き換えて使用することができます。
NEON対応したCMSIS-DSPはライブラリで提供します。
ライブラリ作成環境
NEON対応CMSIS-DSPライブラリは、以下の環境で作成しています。
- コンパイラ
ARMCC Version 5.03 - コンパイルオプションスイッチ[C Compiler]
-DARM_MATH_MATRIX_CHECK -DARM_MATH_ROUNDING -O3 -Otime --cpu=Cortex-A9 --littleend --arm --apcs=/interwork --no_unaligned_access --fpu=vfpv3_fp16 --fpmode=fast --apcs=/hardfp --vectorize --asm
- コンパイルオプションスイッチ[Assembler]
--cpreproc --cpu=Cortex-A9 --littleend --arm --apcs=/interwork --no_unaligned_access --fpu=vfpv3_fp16 --fpmode=fast --apcs=/hardfp
NEON対応による効果について
CMSIS-DSP内の各関数へ渡すデータは、小さいサイズよりも大きいサイズの方が効果が見込めます。
また、16の倍数のデータであれば、CMSIS-DSP内のどの関数でも効果が見込めます。
cmsis_dsp/FastMathFunctions/arm_sin_q31.c@1:fdd22bb7aa52, 2012-11-28 (annotated)
- Committer:
- emilmont
- Date:
- Wed Nov 28 12:30:09 2012 +0000
- Revision:
- 1:fdd22bb7aa52
- Child:
- 2:da51fb522205
DSP library code
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
emilmont | 1:fdd22bb7aa52 | 1 | /* ---------------------------------------------------------------------- |
emilmont | 1:fdd22bb7aa52 | 2 | * Copyright (C) 2010 ARM Limited. All rights reserved. |
emilmont | 1:fdd22bb7aa52 | 3 | * |
emilmont | 1:fdd22bb7aa52 | 4 | * $Date: 15. February 2012 |
emilmont | 1:fdd22bb7aa52 | 5 | * $Revision: V1.1.0 |
emilmont | 1:fdd22bb7aa52 | 6 | * |
emilmont | 1:fdd22bb7aa52 | 7 | * Project: CMSIS DSP Library |
emilmont | 1:fdd22bb7aa52 | 8 | * Title: arm_sin_q31.c |
emilmont | 1:fdd22bb7aa52 | 9 | * |
emilmont | 1:fdd22bb7aa52 | 10 | * Description: Fast sine calculation for Q31 values. |
emilmont | 1:fdd22bb7aa52 | 11 | * |
emilmont | 1:fdd22bb7aa52 | 12 | * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 |
emilmont | 1:fdd22bb7aa52 | 13 | * |
emilmont | 1:fdd22bb7aa52 | 14 | * Version 1.1.0 2012/02/15 |
emilmont | 1:fdd22bb7aa52 | 15 | * Updated with more optimizations, bug fixes and minor API changes. |
emilmont | 1:fdd22bb7aa52 | 16 | * |
emilmont | 1:fdd22bb7aa52 | 17 | * Version 1.0.10 2011/7/15 |
emilmont | 1:fdd22bb7aa52 | 18 | * Big Endian support added and Merged M0 and M3/M4 Source code. |
emilmont | 1:fdd22bb7aa52 | 19 | * |
emilmont | 1:fdd22bb7aa52 | 20 | * Version 1.0.3 2010/11/29 |
emilmont | 1:fdd22bb7aa52 | 21 | * Re-organized the CMSIS folders and updated documentation. |
emilmont | 1:fdd22bb7aa52 | 22 | * |
emilmont | 1:fdd22bb7aa52 | 23 | * Version 1.0.2 2010/11/11 |
emilmont | 1:fdd22bb7aa52 | 24 | * Documentation updated. |
emilmont | 1:fdd22bb7aa52 | 25 | * |
emilmont | 1:fdd22bb7aa52 | 26 | * Version 1.0.1 2010/10/05 |
emilmont | 1:fdd22bb7aa52 | 27 | * Production release and review comments incorporated. |
emilmont | 1:fdd22bb7aa52 | 28 | * |
emilmont | 1:fdd22bb7aa52 | 29 | * Version 1.0.0 2010/09/20 |
emilmont | 1:fdd22bb7aa52 | 30 | * Production release and review comments incorporated. |
emilmont | 1:fdd22bb7aa52 | 31 | * -------------------------------------------------------------------- */ |
emilmont | 1:fdd22bb7aa52 | 32 | |
emilmont | 1:fdd22bb7aa52 | 33 | #include "arm_math.h" |
emilmont | 1:fdd22bb7aa52 | 34 | |
emilmont | 1:fdd22bb7aa52 | 35 | /** |
emilmont | 1:fdd22bb7aa52 | 36 | * @ingroup groupFastMath |
emilmont | 1:fdd22bb7aa52 | 37 | */ |
emilmont | 1:fdd22bb7aa52 | 38 | |
emilmont | 1:fdd22bb7aa52 | 39 | /** |
emilmont | 1:fdd22bb7aa52 | 40 | * @addtogroup sin |
emilmont | 1:fdd22bb7aa52 | 41 | * @{ |
emilmont | 1:fdd22bb7aa52 | 42 | */ |
emilmont | 1:fdd22bb7aa52 | 43 | |
emilmont | 1:fdd22bb7aa52 | 44 | /** |
emilmont | 1:fdd22bb7aa52 | 45 | * \par |
emilmont | 1:fdd22bb7aa52 | 46 | * Tables generated are in Q31(1.31 Fixed point format) |
emilmont | 1:fdd22bb7aa52 | 47 | * Generation of sin values in floating point: |
emilmont | 1:fdd22bb7aa52 | 48 | * <pre>tableSize = 256; |
emilmont | 1:fdd22bb7aa52 | 49 | * for(n = -1; n < (tableSize + 1); n++) |
emilmont | 1:fdd22bb7aa52 | 50 | * { |
emilmont | 1:fdd22bb7aa52 | 51 | * sinTable[n+1]= sin(2*pi*n/tableSize); |
emilmont | 1:fdd22bb7aa52 | 52 | * } </pre> |
emilmont | 1:fdd22bb7aa52 | 53 | * where pi value is 3.14159265358979 |
emilmont | 1:fdd22bb7aa52 | 54 | * \par |
emilmont | 1:fdd22bb7aa52 | 55 | * Convert Floating point to Q31(Fixed point): |
emilmont | 1:fdd22bb7aa52 | 56 | * (sinTable[i] * pow(2, 31)) |
emilmont | 1:fdd22bb7aa52 | 57 | * \par |
emilmont | 1:fdd22bb7aa52 | 58 | * rounding to nearest integer is done |
emilmont | 1:fdd22bb7aa52 | 59 | * sinTable[i] += (sinTable[i] > 0 ? 0.5 :-0.5); |
emilmont | 1:fdd22bb7aa52 | 60 | */ |
emilmont | 1:fdd22bb7aa52 | 61 | |
emilmont | 1:fdd22bb7aa52 | 62 | static const q31_t sinTableQ31[259] = { |
emilmont | 1:fdd22bb7aa52 | 63 | 0xfcdbd541, 0x0, 0x3242abf, 0x647d97c, 0x96a9049, 0xc8bd35e, 0xfab272b, |
emilmont | 1:fdd22bb7aa52 | 64 | 0x12c8106f, |
emilmont | 1:fdd22bb7aa52 | 65 | 0x15e21445, 0x18f8b83c, 0x1c0b826a, 0x1f19f97b, 0x2223a4c5, 0x25280c5e, |
emilmont | 1:fdd22bb7aa52 | 66 | 0x2826b928, 0x2b1f34eb, |
emilmont | 1:fdd22bb7aa52 | 67 | 0x2e110a62, 0x30fbc54d, 0x33def287, 0x36ba2014, 0x398cdd32, 0x3c56ba70, |
emilmont | 1:fdd22bb7aa52 | 68 | 0x3f1749b8, 0x41ce1e65, |
emilmont | 1:fdd22bb7aa52 | 69 | 0x447acd50, 0x471cece7, 0x49b41533, 0x4c3fdff4, 0x4ebfe8a5, 0x5133cc94, |
emilmont | 1:fdd22bb7aa52 | 70 | 0x539b2af0, 0x55f5a4d2, |
emilmont | 1:fdd22bb7aa52 | 71 | 0x5842dd54, 0x5a82799a, 0x5cb420e0, 0x5ed77c8a, 0x60ec3830, 0x62f201ac, |
emilmont | 1:fdd22bb7aa52 | 72 | 0x64e88926, 0x66cf8120, |
emilmont | 1:fdd22bb7aa52 | 73 | 0x68a69e81, 0x6a6d98a4, 0x6c242960, 0x6dca0d14, 0x6f5f02b2, 0x70e2cbc6, |
emilmont | 1:fdd22bb7aa52 | 74 | 0x72552c85, 0x73b5ebd1, |
emilmont | 1:fdd22bb7aa52 | 75 | 0x7504d345, 0x7641af3d, 0x776c4edb, 0x78848414, 0x798a23b1, 0x7a7d055b, |
emilmont | 1:fdd22bb7aa52 | 76 | 0x7b5d039e, 0x7c29fbee, |
emilmont | 1:fdd22bb7aa52 | 77 | 0x7ce3ceb2, 0x7d8a5f40, 0x7e1d93ea, 0x7e9d55fc, 0x7f0991c4, 0x7f62368f, |
emilmont | 1:fdd22bb7aa52 | 78 | 0x7fa736b4, 0x7fd8878e, |
emilmont | 1:fdd22bb7aa52 | 79 | 0x7ff62182, 0x7fffffff, 0x7ff62182, 0x7fd8878e, 0x7fa736b4, 0x7f62368f, |
emilmont | 1:fdd22bb7aa52 | 80 | 0x7f0991c4, 0x7e9d55fc, |
emilmont | 1:fdd22bb7aa52 | 81 | 0x7e1d93ea, 0x7d8a5f40, 0x7ce3ceb2, 0x7c29fbee, 0x7b5d039e, 0x7a7d055b, |
emilmont | 1:fdd22bb7aa52 | 82 | 0x798a23b1, 0x78848414, |
emilmont | 1:fdd22bb7aa52 | 83 | 0x776c4edb, 0x7641af3d, 0x7504d345, 0x73b5ebd1, 0x72552c85, 0x70e2cbc6, |
emilmont | 1:fdd22bb7aa52 | 84 | 0x6f5f02b2, 0x6dca0d14, |
emilmont | 1:fdd22bb7aa52 | 85 | 0x6c242960, 0x6a6d98a4, 0x68a69e81, 0x66cf8120, 0x64e88926, 0x62f201ac, |
emilmont | 1:fdd22bb7aa52 | 86 | 0x60ec3830, 0x5ed77c8a, |
emilmont | 1:fdd22bb7aa52 | 87 | 0x5cb420e0, 0x5a82799a, 0x5842dd54, 0x55f5a4d2, 0x539b2af0, 0x5133cc94, |
emilmont | 1:fdd22bb7aa52 | 88 | 0x4ebfe8a5, 0x4c3fdff4, |
emilmont | 1:fdd22bb7aa52 | 89 | 0x49b41533, 0x471cece7, 0x447acd50, 0x41ce1e65, 0x3f1749b8, 0x3c56ba70, |
emilmont | 1:fdd22bb7aa52 | 90 | 0x398cdd32, 0x36ba2014, |
emilmont | 1:fdd22bb7aa52 | 91 | 0x33def287, 0x30fbc54d, 0x2e110a62, 0x2b1f34eb, 0x2826b928, 0x25280c5e, |
emilmont | 1:fdd22bb7aa52 | 92 | 0x2223a4c5, 0x1f19f97b, |
emilmont | 1:fdd22bb7aa52 | 93 | 0x1c0b826a, 0x18f8b83c, 0x15e21445, 0x12c8106f, 0xfab272b, 0xc8bd35e, |
emilmont | 1:fdd22bb7aa52 | 94 | 0x96a9049, 0x647d97c, |
emilmont | 1:fdd22bb7aa52 | 95 | 0x3242abf, 0x0, 0xfcdbd541, 0xf9b82684, 0xf6956fb7, 0xf3742ca2, 0xf054d8d5, |
emilmont | 1:fdd22bb7aa52 | 96 | 0xed37ef91, |
emilmont | 1:fdd22bb7aa52 | 97 | 0xea1debbb, 0xe70747c4, 0xe3f47d96, 0xe0e60685, 0xdddc5b3b, 0xdad7f3a2, |
emilmont | 1:fdd22bb7aa52 | 98 | 0xd7d946d8, 0xd4e0cb15, |
emilmont | 1:fdd22bb7aa52 | 99 | 0xd1eef59e, 0xcf043ab3, 0xcc210d79, 0xc945dfec, 0xc67322ce, 0xc3a94590, |
emilmont | 1:fdd22bb7aa52 | 100 | 0xc0e8b648, 0xbe31e19b, |
emilmont | 1:fdd22bb7aa52 | 101 | 0xbb8532b0, 0xb8e31319, 0xb64beacd, 0xb3c0200c, 0xb140175b, 0xaecc336c, |
emilmont | 1:fdd22bb7aa52 | 102 | 0xac64d510, 0xaa0a5b2e, |
emilmont | 1:fdd22bb7aa52 | 103 | 0xa7bd22ac, 0xa57d8666, 0xa34bdf20, 0xa1288376, 0x9f13c7d0, 0x9d0dfe54, |
emilmont | 1:fdd22bb7aa52 | 104 | 0x9b1776da, 0x99307ee0, |
emilmont | 1:fdd22bb7aa52 | 105 | 0x9759617f, 0x9592675c, 0x93dbd6a0, 0x9235f2ec, 0x90a0fd4e, 0x8f1d343a, |
emilmont | 1:fdd22bb7aa52 | 106 | 0x8daad37b, 0x8c4a142f, |
emilmont | 1:fdd22bb7aa52 | 107 | 0x8afb2cbb, 0x89be50c3, 0x8893b125, 0x877b7bec, 0x8675dc4f, 0x8582faa5, |
emilmont | 1:fdd22bb7aa52 | 108 | 0x84a2fc62, 0x83d60412, |
emilmont | 1:fdd22bb7aa52 | 109 | 0x831c314e, 0x8275a0c0, 0x81e26c16, 0x8162aa04, 0x80f66e3c, 0x809dc971, |
emilmont | 1:fdd22bb7aa52 | 110 | 0x8058c94c, 0x80277872, |
emilmont | 1:fdd22bb7aa52 | 111 | 0x8009de7e, 0x80000000, 0x8009de7e, 0x80277872, 0x8058c94c, 0x809dc971, |
emilmont | 1:fdd22bb7aa52 | 112 | 0x80f66e3c, 0x8162aa04, |
emilmont | 1:fdd22bb7aa52 | 113 | 0x81e26c16, 0x8275a0c0, 0x831c314e, 0x83d60412, 0x84a2fc62, 0x8582faa5, |
emilmont | 1:fdd22bb7aa52 | 114 | 0x8675dc4f, 0x877b7bec, |
emilmont | 1:fdd22bb7aa52 | 115 | 0x8893b125, 0x89be50c3, 0x8afb2cbb, 0x8c4a142f, 0x8daad37b, 0x8f1d343a, |
emilmont | 1:fdd22bb7aa52 | 116 | 0x90a0fd4e, 0x9235f2ec, |
emilmont | 1:fdd22bb7aa52 | 117 | 0x93dbd6a0, 0x9592675c, 0x9759617f, 0x99307ee0, 0x9b1776da, 0x9d0dfe54, |
emilmont | 1:fdd22bb7aa52 | 118 | 0x9f13c7d0, 0xa1288376, |
emilmont | 1:fdd22bb7aa52 | 119 | 0xa34bdf20, 0xa57d8666, 0xa7bd22ac, 0xaa0a5b2e, 0xac64d510, 0xaecc336c, |
emilmont | 1:fdd22bb7aa52 | 120 | 0xb140175b, 0xb3c0200c, |
emilmont | 1:fdd22bb7aa52 | 121 | 0xb64beacd, 0xb8e31319, 0xbb8532b0, 0xbe31e19b, 0xc0e8b648, 0xc3a94590, |
emilmont | 1:fdd22bb7aa52 | 122 | 0xc67322ce, 0xc945dfec, |
emilmont | 1:fdd22bb7aa52 | 123 | 0xcc210d79, 0xcf043ab3, 0xd1eef59e, 0xd4e0cb15, 0xd7d946d8, 0xdad7f3a2, |
emilmont | 1:fdd22bb7aa52 | 124 | 0xdddc5b3b, 0xe0e60685, |
emilmont | 1:fdd22bb7aa52 | 125 | 0xe3f47d96, 0xe70747c4, 0xea1debbb, 0xed37ef91, 0xf054d8d5, 0xf3742ca2, |
emilmont | 1:fdd22bb7aa52 | 126 | 0xf6956fb7, 0xf9b82684, |
emilmont | 1:fdd22bb7aa52 | 127 | 0xfcdbd541, 0x0, 0x3242abf |
emilmont | 1:fdd22bb7aa52 | 128 | }; |
emilmont | 1:fdd22bb7aa52 | 129 | |
emilmont | 1:fdd22bb7aa52 | 130 | |
emilmont | 1:fdd22bb7aa52 | 131 | /** |
emilmont | 1:fdd22bb7aa52 | 132 | * @brief Fast approximation to the trigonometric sine function for Q31 data. |
emilmont | 1:fdd22bb7aa52 | 133 | * @param[in] x Scaled input value in radians. |
emilmont | 1:fdd22bb7aa52 | 134 | * @return sin(x). |
emilmont | 1:fdd22bb7aa52 | 135 | * |
emilmont | 1:fdd22bb7aa52 | 136 | * The Q31 input value is in the range [0 +0.9999] and is mapped to a radian value in the range [0 2*pi), Here range excludes 2*pi. |
emilmont | 1:fdd22bb7aa52 | 137 | */ |
emilmont | 1:fdd22bb7aa52 | 138 | |
emilmont | 1:fdd22bb7aa52 | 139 | q31_t arm_sin_q31( |
emilmont | 1:fdd22bb7aa52 | 140 | q31_t x) |
emilmont | 1:fdd22bb7aa52 | 141 | { |
emilmont | 1:fdd22bb7aa52 | 142 | q31_t sinVal, in, in2; /* Temporary variables for input, output */ |
emilmont | 1:fdd22bb7aa52 | 143 | int32_t index; /* Index variables */ |
emilmont | 1:fdd22bb7aa52 | 144 | q31_t wa, wb, wc, wd; /* Cubic interpolation coefficients */ |
emilmont | 1:fdd22bb7aa52 | 145 | q31_t a, b, c, d; /* Four nearest output values */ |
emilmont | 1:fdd22bb7aa52 | 146 | q31_t *tablePtr; /* Pointer to table */ |
emilmont | 1:fdd22bb7aa52 | 147 | q31_t fract, fractCube, fractSquare; /* Temporary values for fractional values */ |
emilmont | 1:fdd22bb7aa52 | 148 | q31_t oneBy6 = 0x15555555; /* Fixed point value of 1/6 */ |
emilmont | 1:fdd22bb7aa52 | 149 | q31_t tableSpacing = TABLE_SPACING_Q31; /* Table spacing */ |
emilmont | 1:fdd22bb7aa52 | 150 | q31_t temp; /* Temporary variable for intermediate process */ |
emilmont | 1:fdd22bb7aa52 | 151 | |
emilmont | 1:fdd22bb7aa52 | 152 | in = x; |
emilmont | 1:fdd22bb7aa52 | 153 | |
emilmont | 1:fdd22bb7aa52 | 154 | /* Calculate the nearest index */ |
emilmont | 1:fdd22bb7aa52 | 155 | index = (uint32_t) in / (uint32_t) tableSpacing; |
emilmont | 1:fdd22bb7aa52 | 156 | |
emilmont | 1:fdd22bb7aa52 | 157 | /* Calculate the nearest value of input */ |
emilmont | 1:fdd22bb7aa52 | 158 | in2 = (q31_t) index *tableSpacing; |
emilmont | 1:fdd22bb7aa52 | 159 | |
emilmont | 1:fdd22bb7aa52 | 160 | /* Calculation of fractional value */ |
emilmont | 1:fdd22bb7aa52 | 161 | fract = (in - in2) << 8; |
emilmont | 1:fdd22bb7aa52 | 162 | |
emilmont | 1:fdd22bb7aa52 | 163 | /* fractSquare = fract * fract */ |
emilmont | 1:fdd22bb7aa52 | 164 | fractSquare = ((q31_t) (((q63_t) fract * fract) >> 32)); |
emilmont | 1:fdd22bb7aa52 | 165 | fractSquare = fractSquare << 1; |
emilmont | 1:fdd22bb7aa52 | 166 | |
emilmont | 1:fdd22bb7aa52 | 167 | /* fractCube = fract * fract * fract */ |
emilmont | 1:fdd22bb7aa52 | 168 | fractCube = ((q31_t) (((q63_t) fractSquare * fract) >> 32)); |
emilmont | 1:fdd22bb7aa52 | 169 | fractCube = fractCube << 1; |
emilmont | 1:fdd22bb7aa52 | 170 | |
emilmont | 1:fdd22bb7aa52 | 171 | /* Checking min and max index of table */ |
emilmont | 1:fdd22bb7aa52 | 172 | if(index < 0) |
emilmont | 1:fdd22bb7aa52 | 173 | { |
emilmont | 1:fdd22bb7aa52 | 174 | index = 0; |
emilmont | 1:fdd22bb7aa52 | 175 | } |
emilmont | 1:fdd22bb7aa52 | 176 | else if(index > 256) |
emilmont | 1:fdd22bb7aa52 | 177 | { |
emilmont | 1:fdd22bb7aa52 | 178 | index = 256; |
emilmont | 1:fdd22bb7aa52 | 179 | } |
emilmont | 1:fdd22bb7aa52 | 180 | |
emilmont | 1:fdd22bb7aa52 | 181 | /* Initialise table pointer */ |
emilmont | 1:fdd22bb7aa52 | 182 | tablePtr = (q31_t *) & sinTableQ31[index]; |
emilmont | 1:fdd22bb7aa52 | 183 | |
emilmont | 1:fdd22bb7aa52 | 184 | /* Cubic interpolation process */ |
emilmont | 1:fdd22bb7aa52 | 185 | /* Calculation of wa */ |
emilmont | 1:fdd22bb7aa52 | 186 | /* wa = -(oneBy6)*fractCube + (fractSquare >> 1u) - (0x2AAAAAAA)*fract; */ |
emilmont | 1:fdd22bb7aa52 | 187 | wa = ((q31_t) (((q63_t) oneBy6 * fractCube) >> 32)); |
emilmont | 1:fdd22bb7aa52 | 188 | temp = 0x2AAAAAAA; |
emilmont | 1:fdd22bb7aa52 | 189 | wa = (q31_t) ((((q63_t) wa << 32) + ((q63_t) temp * fract)) >> 32); |
emilmont | 1:fdd22bb7aa52 | 190 | wa = -(wa << 1u); |
emilmont | 1:fdd22bb7aa52 | 191 | wa += (fractSquare >> 1u); |
emilmont | 1:fdd22bb7aa52 | 192 | |
emilmont | 1:fdd22bb7aa52 | 193 | /* Read first nearest value of output from the sin table */ |
emilmont | 1:fdd22bb7aa52 | 194 | a = *tablePtr++; |
emilmont | 1:fdd22bb7aa52 | 195 | |
emilmont | 1:fdd22bb7aa52 | 196 | /* sinVal = a*wa */ |
emilmont | 1:fdd22bb7aa52 | 197 | sinVal = ((q31_t) (((q63_t) a * wa) >> 32)); |
emilmont | 1:fdd22bb7aa52 | 198 | |
emilmont | 1:fdd22bb7aa52 | 199 | /* q31(1.31) Fixed point value of 1 */ |
emilmont | 1:fdd22bb7aa52 | 200 | temp = 0x7FFFFFFF; |
emilmont | 1:fdd22bb7aa52 | 201 | |
emilmont | 1:fdd22bb7aa52 | 202 | /* Calculation of wb */ |
emilmont | 1:fdd22bb7aa52 | 203 | wb = ((fractCube >> 1u) - (fractSquare + (fract >> 1u))) + temp; |
emilmont | 1:fdd22bb7aa52 | 204 | |
emilmont | 1:fdd22bb7aa52 | 205 | /* Read second nearest value of output from the sin table */ |
emilmont | 1:fdd22bb7aa52 | 206 | b = *tablePtr++; |
emilmont | 1:fdd22bb7aa52 | 207 | |
emilmont | 1:fdd22bb7aa52 | 208 | /* sinVal += b*wb */ |
emilmont | 1:fdd22bb7aa52 | 209 | sinVal = (q31_t) ((((q63_t) sinVal << 32) + (q63_t) b * (wb)) >> 32); |
emilmont | 1:fdd22bb7aa52 | 210 | |
emilmont | 1:fdd22bb7aa52 | 211 | /* Calculation of wc */ |
emilmont | 1:fdd22bb7aa52 | 212 | wc = -fractCube + fractSquare; |
emilmont | 1:fdd22bb7aa52 | 213 | wc = (wc >> 1u) + fract; |
emilmont | 1:fdd22bb7aa52 | 214 | |
emilmont | 1:fdd22bb7aa52 | 215 | /* Read third nearest value of output from the sin table */ |
emilmont | 1:fdd22bb7aa52 | 216 | c = *tablePtr++; |
emilmont | 1:fdd22bb7aa52 | 217 | |
emilmont | 1:fdd22bb7aa52 | 218 | /* sinVal += c*wc */ |
emilmont | 1:fdd22bb7aa52 | 219 | sinVal = (q31_t) ((((q63_t) sinVal << 32) + ((q63_t) c * wc)) >> 32); |
emilmont | 1:fdd22bb7aa52 | 220 | |
emilmont | 1:fdd22bb7aa52 | 221 | /* Calculation of wd */ |
emilmont | 1:fdd22bb7aa52 | 222 | /* wd = (oneBy6) * fractCube - (oneBy6) * fract; */ |
emilmont | 1:fdd22bb7aa52 | 223 | fractCube = fractCube - fract; |
emilmont | 1:fdd22bb7aa52 | 224 | wd = ((q31_t) (((q63_t) oneBy6 * fractCube) >> 32)); |
emilmont | 1:fdd22bb7aa52 | 225 | wd = (wd << 1u); |
emilmont | 1:fdd22bb7aa52 | 226 | |
emilmont | 1:fdd22bb7aa52 | 227 | /* Read fourth nearest value of output from the sin table */ |
emilmont | 1:fdd22bb7aa52 | 228 | d = *tablePtr++; |
emilmont | 1:fdd22bb7aa52 | 229 | |
emilmont | 1:fdd22bb7aa52 | 230 | /* sinVal += d*wd; */ |
emilmont | 1:fdd22bb7aa52 | 231 | sinVal = (q31_t) ((((q63_t) sinVal << 32) + ((q63_t) d * wd)) >> 32); |
emilmont | 1:fdd22bb7aa52 | 232 | |
emilmont | 1:fdd22bb7aa52 | 233 | /* convert sinVal in 2.30 format to 1.31 format */ |
emilmont | 1:fdd22bb7aa52 | 234 | return (__QADD(sinVal, sinVal)); |
emilmont | 1:fdd22bb7aa52 | 235 | |
emilmont | 1:fdd22bb7aa52 | 236 | } |
emilmont | 1:fdd22bb7aa52 | 237 | |
emilmont | 1:fdd22bb7aa52 | 238 | /** |
emilmont | 1:fdd22bb7aa52 | 239 | * @} end of sin group |
emilmont | 1:fdd22bb7aa52 | 240 | */ |