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CMSIS DSP library

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cmsis_dsp/ControllerFunctions/arm_sin_cos_f32.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?

UserRevisionLine numberNew 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_cos_f32.c
emilmont 1:fdd22bb7aa52 9 *
emilmont 1:fdd22bb7aa52 10 * Description: Sine and Cosine calculation for floating-point 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 groupController
emilmont 1:fdd22bb7aa52 37 */
emilmont 1:fdd22bb7aa52 38
emilmont 1:fdd22bb7aa52 39 /**
emilmont 1:fdd22bb7aa52 40 * @defgroup SinCos Sine Cosine
emilmont 1:fdd22bb7aa52 41 *
emilmont 1:fdd22bb7aa52 42 * Computes the trigonometric sine and cosine values using a combination of table lookup
emilmont 1:fdd22bb7aa52 43 * and linear interpolation.
emilmont 1:fdd22bb7aa52 44 * There are separate functions for Q31 and floating-point data types.
emilmont 1:fdd22bb7aa52 45 * The input to the floating-point version is in degrees while the
emilmont 1:fdd22bb7aa52 46 * fixed-point Q31 have a scaled input with the range
emilmont 1:fdd22bb7aa52 47 * [-1 0.9999] mapping to [-180 179] degrees.
emilmont 1:fdd22bb7aa52 48 *
emilmont 1:fdd22bb7aa52 49 * The implementation is based on table lookup using 360 values together with linear interpolation.
emilmont 1:fdd22bb7aa52 50 * The steps used are:
emilmont 1:fdd22bb7aa52 51 * -# Calculation of the nearest integer table index.
emilmont 1:fdd22bb7aa52 52 * -# Compute the fractional portion (fract) of the input.
emilmont 1:fdd22bb7aa52 53 * -# Fetch the value corresponding to \c index from sine table to \c y0 and also value from \c index+1 to \c y1.
emilmont 1:fdd22bb7aa52 54 * -# Sine value is computed as <code> *psinVal = y0 + (fract * (y1 - y0))</code>.
emilmont 1:fdd22bb7aa52 55 * -# Fetch the value corresponding to \c index from cosine table to \c y0 and also value from \c index+1 to \c y1.
emilmont 1:fdd22bb7aa52 56 * -# Cosine value is computed as <code> *pcosVal = y0 + (fract * (y1 - y0))</code>.
emilmont 1:fdd22bb7aa52 57 */
emilmont 1:fdd22bb7aa52 58
emilmont 1:fdd22bb7aa52 59 /**
emilmont 1:fdd22bb7aa52 60 * @addtogroup SinCos
emilmont 1:fdd22bb7aa52 61 * @{
emilmont 1:fdd22bb7aa52 62 */
emilmont 1:fdd22bb7aa52 63
emilmont 1:fdd22bb7aa52 64
emilmont 1:fdd22bb7aa52 65 /**
emilmont 1:fdd22bb7aa52 66 * \par
emilmont 1:fdd22bb7aa52 67 * Cosine Table is generated from following loop
emilmont 1:fdd22bb7aa52 68 * <pre>for(i = 0; i < 360; i++)
emilmont 1:fdd22bb7aa52 69 * {
emilmont 1:fdd22bb7aa52 70 * cosTable[i]= cos((i-180) * PI/180.0);
emilmont 1:fdd22bb7aa52 71 * } </pre>
emilmont 1:fdd22bb7aa52 72 */
emilmont 1:fdd22bb7aa52 73
emilmont 1:fdd22bb7aa52 74 static const float32_t cosTable[360] = {
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emilmont 1:fdd22bb7aa52 205 -0.978147600733805690f, -0.981627183447663980f, -0.984807753012208020f,
emilmont 1:fdd22bb7aa52 206 -0.987688340595137660f, -0.990268068741570250f,
emilmont 1:fdd22bb7aa52 207 -0.992546151641321980f, -0.994521895368273290f, -0.996194698091745550f,
emilmont 1:fdd22bb7aa52 208 -0.997564050259824200f, -0.998629534754573830f, -0.999390827019095760f,
emilmont 1:fdd22bb7aa52 209 -0.999847695156391270f, -1.000000000000000000f
emilmont 1:fdd22bb7aa52 210 };
emilmont 1:fdd22bb7aa52 211
emilmont 1:fdd22bb7aa52 212 /**
emilmont 1:fdd22bb7aa52 213 * \par
emilmont 1:fdd22bb7aa52 214 * Sine Table is generated from following loop
emilmont 1:fdd22bb7aa52 215 * <pre>for(i = 0; i < 360; i++)
emilmont 1:fdd22bb7aa52 216 * {
emilmont 1:fdd22bb7aa52 217 * sinTable[i]= sin((i-180) * PI/180.0);
emilmont 1:fdd22bb7aa52 218 * } </pre>
emilmont 1:fdd22bb7aa52 219 */
emilmont 1:fdd22bb7aa52 220
emilmont 1:fdd22bb7aa52 221
emilmont 1:fdd22bb7aa52 222 static const float32_t sinTable[360] = {
emilmont 1:fdd22bb7aa52 223 -0.017452406437283439f, -0.034899496702500699f, -0.052335956242943807f,
emilmont 1:fdd22bb7aa52 224 -0.069756473744125524f, -0.087155742747658638f, -0.104528463267653730f,
emilmont 1:fdd22bb7aa52 225 -0.121869343405147550f, -0.139173100960065740f,
emilmont 1:fdd22bb7aa52 226 -0.156434465040230980f, -0.173648177666930280f, -0.190808995376544970f,
emilmont 1:fdd22bb7aa52 227 -0.207911690817759310f, -0.224951054343864780f, -0.241921895599667730f,
emilmont 1:fdd22bb7aa52 228 -0.258819045102521020f, -0.275637355816999660f,
emilmont 1:fdd22bb7aa52 229 -0.292371704722737050f, -0.309016994374947510f, -0.325568154457156980f,
emilmont 1:fdd22bb7aa52 230 -0.342020143325668880f, -0.358367949545300210f, -0.374606593415912240f,
emilmont 1:fdd22bb7aa52 231 -0.390731128489274160f, -0.406736643075800430f,
emilmont 1:fdd22bb7aa52 232 -0.422618261740699500f, -0.438371146789077290f, -0.453990499739546860f,
emilmont 1:fdd22bb7aa52 233 -0.469471562785891080f, -0.484809620246337170f, -0.499999999999999940f,
emilmont 1:fdd22bb7aa52 234 -0.515038074910054380f, -0.529919264233204900f,
emilmont 1:fdd22bb7aa52 235 -0.544639035015026860f, -0.559192903470746900f, -0.573576436351046380f,
emilmont 1:fdd22bb7aa52 236 -0.587785252292473250f, -0.601815023152048160f, -0.615661475325658400f,
emilmont 1:fdd22bb7aa52 237 -0.629320391049837720f, -0.642787609686539470f,
emilmont 1:fdd22bb7aa52 238 -0.656059028990507280f, -0.669130606358858350f, -0.681998360062498590f,
emilmont 1:fdd22bb7aa52 239 -0.694658370458997140f, -0.707106781186547570f, -0.719339800338651410f,
emilmont 1:fdd22bb7aa52 240 -0.731353701619170570f, -0.743144825477394240f,
emilmont 1:fdd22bb7aa52 241 -0.754709580222771790f, -0.766044443118978010f, -0.777145961456971010f,
emilmont 1:fdd22bb7aa52 242 -0.788010753606722010f, -0.798635510047292720f, -0.809016994374947450f,
emilmont 1:fdd22bb7aa52 243 -0.819152044288992020f, -0.829037572555041740f,
emilmont 1:fdd22bb7aa52 244 -0.838670567945424050f, -0.848048096156426070f, -0.857167300702112330f,
emilmont 1:fdd22bb7aa52 245 -0.866025403784438710f, -0.874619707139395850f, -0.882947592858927100f,
emilmont 1:fdd22bb7aa52 246 -0.891006524188367900f, -0.898794046299166930f,
emilmont 1:fdd22bb7aa52 247 -0.906307787036650050f, -0.913545457642600980f, -0.920504853452440370f,
emilmont 1:fdd22bb7aa52 248 -0.927183854566787420f, -0.933580426497201740f, -0.939692620785908430f,
emilmont 1:fdd22bb7aa52 249 -0.945518575599316850f, -0.951056516295153640f,
emilmont 1:fdd22bb7aa52 250 -0.956304755963035550f, -0.961261695938318890f, -0.965925826289068310f,
emilmont 1:fdd22bb7aa52 251 -0.970295726275996470f, -0.974370064785235250f, -0.978147600733805690f,
emilmont 1:fdd22bb7aa52 252 -0.981627183447663980f, -0.984807753012208020f,
emilmont 1:fdd22bb7aa52 253 -0.987688340595137660f, -0.990268068741570360f, -0.992546151641322090f,
emilmont 1:fdd22bb7aa52 254 -0.994521895368273400f, -0.996194698091745550f, -0.997564050259824200f,
emilmont 1:fdd22bb7aa52 255 -0.998629534754573830f, -0.999390827019095760f,
emilmont 1:fdd22bb7aa52 256 -0.999847695156391270f, -1.000000000000000000f, -0.999847695156391270f,
emilmont 1:fdd22bb7aa52 257 -0.999390827019095760f, -0.998629534754573830f, -0.997564050259824200f,
emilmont 1:fdd22bb7aa52 258 -0.996194698091745550f, -0.994521895368273290f,
emilmont 1:fdd22bb7aa52 259 -0.992546151641321980f, -0.990268068741570250f, -0.987688340595137770f,
emilmont 1:fdd22bb7aa52 260 -0.984807753012208020f, -0.981627183447663980f, -0.978147600733805580f,
emilmont 1:fdd22bb7aa52 261 -0.974370064785235250f, -0.970295726275996470f,
emilmont 1:fdd22bb7aa52 262 -0.965925826289068310f, -0.961261695938318890f, -0.956304755963035440f,
emilmont 1:fdd22bb7aa52 263 -0.951056516295153530f, -0.945518575599316740f, -0.939692620785908320f,
emilmont 1:fdd22bb7aa52 264 -0.933580426497201740f, -0.927183854566787420f,
emilmont 1:fdd22bb7aa52 265 -0.920504853452440260f, -0.913545457642600870f, -0.906307787036649940f,
emilmont 1:fdd22bb7aa52 266 -0.898794046299167040f, -0.891006524188367790f, -0.882947592858926880f,
emilmont 1:fdd22bb7aa52 267 -0.874619707139395740f, -0.866025403784438600f,
emilmont 1:fdd22bb7aa52 268 -0.857167300702112220f, -0.848048096156426070f, -0.838670567945423940f,
emilmont 1:fdd22bb7aa52 269 -0.829037572555041740f, -0.819152044288991800f, -0.809016994374947450f,
emilmont 1:fdd22bb7aa52 270 -0.798635510047292830f, -0.788010753606722010f,
emilmont 1:fdd22bb7aa52 271 -0.777145961456970790f, -0.766044443118978010f, -0.754709580222772010f,
emilmont 1:fdd22bb7aa52 272 -0.743144825477394240f, -0.731353701619170460f, -0.719339800338651080f,
emilmont 1:fdd22bb7aa52 273 -0.707106781186547460f, -0.694658370458997250f,
emilmont 1:fdd22bb7aa52 274 -0.681998360062498480f, -0.669130606358858240f, -0.656059028990507160f,
emilmont 1:fdd22bb7aa52 275 -0.642787609686539250f, -0.629320391049837390f, -0.615661475325658180f,
emilmont 1:fdd22bb7aa52 276 -0.601815023152048270f, -0.587785252292473140f,
emilmont 1:fdd22bb7aa52 277 -0.573576436351046050f, -0.559192903470746900f, -0.544639035015027080f,
emilmont 1:fdd22bb7aa52 278 -0.529919264233204900f, -0.515038074910054160f, -0.499999999999999940f,
emilmont 1:fdd22bb7aa52 279 -0.484809620246337060f, -0.469471562785890810f,
emilmont 1:fdd22bb7aa52 280 -0.453990499739546750f, -0.438371146789077400f, -0.422618261740699440f,
emilmont 1:fdd22bb7aa52 281 -0.406736643075800150f, -0.390731128489273720f, -0.374606593415912010f,
emilmont 1:fdd22bb7aa52 282 -0.358367949545300270f, -0.342020143325668710f,
emilmont 1:fdd22bb7aa52 283 -0.325568154457156640f, -0.309016994374947400f, -0.292371704722736770f,
emilmont 1:fdd22bb7aa52 284 -0.275637355816999160f, -0.258819045102520740f, -0.241921895599667730f,
emilmont 1:fdd22bb7aa52 285 -0.224951054343865000f, -0.207911690817759310f,
emilmont 1:fdd22bb7aa52 286 -0.190808995376544800f, -0.173648177666930330f, -0.156434465040230870f,
emilmont 1:fdd22bb7aa52 287 -0.139173100960065440f, -0.121869343405147480f, -0.104528463267653460f,
emilmont 1:fdd22bb7aa52 288 -0.087155742747658166f, -0.069756473744125302f,
emilmont 1:fdd22bb7aa52 289 -0.052335956242943828f, -0.034899496702500969f, -0.017452406437283512f,
emilmont 1:fdd22bb7aa52 290 0.000000000000000000f, 0.017452406437283512f, 0.034899496702500969f,
emilmont 1:fdd22bb7aa52 291 0.052335956242943828f, 0.069756473744125302f,
emilmont 1:fdd22bb7aa52 292 0.087155742747658166f, 0.104528463267653460f, 0.121869343405147480f,
emilmont 1:fdd22bb7aa52 293 0.139173100960065440f, 0.156434465040230870f, 0.173648177666930330f,
emilmont 1:fdd22bb7aa52 294 0.190808995376544800f, 0.207911690817759310f,
emilmont 1:fdd22bb7aa52 295 0.224951054343865000f, 0.241921895599667730f, 0.258819045102520740f,
emilmont 1:fdd22bb7aa52 296 0.275637355816999160f, 0.292371704722736770f, 0.309016994374947400f,
emilmont 1:fdd22bb7aa52 297 0.325568154457156640f, 0.342020143325668710f,
emilmont 1:fdd22bb7aa52 298 0.358367949545300270f, 0.374606593415912010f, 0.390731128489273720f,
emilmont 1:fdd22bb7aa52 299 0.406736643075800150f, 0.422618261740699440f, 0.438371146789077400f,
emilmont 1:fdd22bb7aa52 300 0.453990499739546750f, 0.469471562785890810f,
emilmont 1:fdd22bb7aa52 301 0.484809620246337060f, 0.499999999999999940f, 0.515038074910054160f,
emilmont 1:fdd22bb7aa52 302 0.529919264233204900f, 0.544639035015027080f, 0.559192903470746900f,
emilmont 1:fdd22bb7aa52 303 0.573576436351046050f, 0.587785252292473140f,
emilmont 1:fdd22bb7aa52 304 0.601815023152048270f, 0.615661475325658180f, 0.629320391049837390f,
emilmont 1:fdd22bb7aa52 305 0.642787609686539250f, 0.656059028990507160f, 0.669130606358858240f,
emilmont 1:fdd22bb7aa52 306 0.681998360062498480f, 0.694658370458997250f,
emilmont 1:fdd22bb7aa52 307 0.707106781186547460f, 0.719339800338651080f, 0.731353701619170460f,
emilmont 1:fdd22bb7aa52 308 0.743144825477394240f, 0.754709580222772010f, 0.766044443118978010f,
emilmont 1:fdd22bb7aa52 309 0.777145961456970790f, 0.788010753606722010f,
emilmont 1:fdd22bb7aa52 310 0.798635510047292830f, 0.809016994374947450f, 0.819152044288991800f,
emilmont 1:fdd22bb7aa52 311 0.829037572555041740f, 0.838670567945423940f, 0.848048096156426070f,
emilmont 1:fdd22bb7aa52 312 0.857167300702112220f, 0.866025403784438600f,
emilmont 1:fdd22bb7aa52 313 0.874619707139395740f, 0.882947592858926880f, 0.891006524188367790f,
emilmont 1:fdd22bb7aa52 314 0.898794046299167040f, 0.906307787036649940f, 0.913545457642600870f,
emilmont 1:fdd22bb7aa52 315 0.920504853452440260f, 0.927183854566787420f,
emilmont 1:fdd22bb7aa52 316 0.933580426497201740f, 0.939692620785908320f, 0.945518575599316740f,
emilmont 1:fdd22bb7aa52 317 0.951056516295153530f, 0.956304755963035440f, 0.961261695938318890f,
emilmont 1:fdd22bb7aa52 318 0.965925826289068310f, 0.970295726275996470f,
emilmont 1:fdd22bb7aa52 319 0.974370064785235250f, 0.978147600733805580f, 0.981627183447663980f,
emilmont 1:fdd22bb7aa52 320 0.984807753012208020f, 0.987688340595137770f, 0.990268068741570250f,
emilmont 1:fdd22bb7aa52 321 0.992546151641321980f, 0.994521895368273290f,
emilmont 1:fdd22bb7aa52 322 0.996194698091745550f, 0.997564050259824200f, 0.998629534754573830f,
emilmont 1:fdd22bb7aa52 323 0.999390827019095760f, 0.999847695156391270f, 1.000000000000000000f,
emilmont 1:fdd22bb7aa52 324 0.999847695156391270f, 0.999390827019095760f,
emilmont 1:fdd22bb7aa52 325 0.998629534754573830f, 0.997564050259824200f, 0.996194698091745550f,
emilmont 1:fdd22bb7aa52 326 0.994521895368273400f, 0.992546151641322090f, 0.990268068741570360f,
emilmont 1:fdd22bb7aa52 327 0.987688340595137660f, 0.984807753012208020f,
emilmont 1:fdd22bb7aa52 328 0.981627183447663980f, 0.978147600733805690f, 0.974370064785235250f,
emilmont 1:fdd22bb7aa52 329 0.970295726275996470f, 0.965925826289068310f, 0.961261695938318890f,
emilmont 1:fdd22bb7aa52 330 0.956304755963035550f, 0.951056516295153640f,
emilmont 1:fdd22bb7aa52 331 0.945518575599316850f, 0.939692620785908430f, 0.933580426497201740f,
emilmont 1:fdd22bb7aa52 332 0.927183854566787420f, 0.920504853452440370f, 0.913545457642600980f,
emilmont 1:fdd22bb7aa52 333 0.906307787036650050f, 0.898794046299166930f,
emilmont 1:fdd22bb7aa52 334 0.891006524188367900f, 0.882947592858927100f, 0.874619707139395850f,
emilmont 1:fdd22bb7aa52 335 0.866025403784438710f, 0.857167300702112330f, 0.848048096156426070f,
emilmont 1:fdd22bb7aa52 336 0.838670567945424050f, 0.829037572555041740f,
emilmont 1:fdd22bb7aa52 337 0.819152044288992020f, 0.809016994374947450f, 0.798635510047292720f,
emilmont 1:fdd22bb7aa52 338 0.788010753606722010f, 0.777145961456971010f, 0.766044443118978010f,
emilmont 1:fdd22bb7aa52 339 0.754709580222771790f, 0.743144825477394240f,
emilmont 1:fdd22bb7aa52 340 0.731353701619170570f, 0.719339800338651410f, 0.707106781186547570f,
emilmont 1:fdd22bb7aa52 341 0.694658370458997140f, 0.681998360062498590f, 0.669130606358858350f,
emilmont 1:fdd22bb7aa52 342 0.656059028990507280f, 0.642787609686539470f,
emilmont 1:fdd22bb7aa52 343 0.629320391049837720f, 0.615661475325658400f, 0.601815023152048160f,
emilmont 1:fdd22bb7aa52 344 0.587785252292473250f, 0.573576436351046380f, 0.559192903470746900f,
emilmont 1:fdd22bb7aa52 345 0.544639035015026860f, 0.529919264233204900f,
emilmont 1:fdd22bb7aa52 346 0.515038074910054380f, 0.499999999999999940f, 0.484809620246337170f,
emilmont 1:fdd22bb7aa52 347 0.469471562785891080f, 0.453990499739546860f, 0.438371146789077290f,
emilmont 1:fdd22bb7aa52 348 0.422618261740699500f, 0.406736643075800430f,
emilmont 1:fdd22bb7aa52 349 0.390731128489274160f, 0.374606593415912240f, 0.358367949545300210f,
emilmont 1:fdd22bb7aa52 350 0.342020143325668880f, 0.325568154457156980f, 0.309016994374947510f,
emilmont 1:fdd22bb7aa52 351 0.292371704722737050f, 0.275637355816999660f,
emilmont 1:fdd22bb7aa52 352 0.258819045102521020f, 0.241921895599667730f, 0.224951054343864780f,
emilmont 1:fdd22bb7aa52 353 0.207911690817759310f, 0.190808995376544970f, 0.173648177666930280f,
emilmont 1:fdd22bb7aa52 354 0.156434465040230980f, 0.139173100960065740f,
emilmont 1:fdd22bb7aa52 355 0.121869343405147550f, 0.104528463267653730f, 0.087155742747658638f,
emilmont 1:fdd22bb7aa52 356 0.069756473744125524f, 0.052335956242943807f, 0.034899496702500699f,
emilmont 1:fdd22bb7aa52 357 0.017452406437283439f, 0.000000000000000122f
emilmont 1:fdd22bb7aa52 358 };
emilmont 1:fdd22bb7aa52 359
emilmont 1:fdd22bb7aa52 360
emilmont 1:fdd22bb7aa52 361 /**
emilmont 1:fdd22bb7aa52 362 * @brief Floating-point sin_cos function.
emilmont 1:fdd22bb7aa52 363 * @param[in] theta input value in degrees
emilmont 1:fdd22bb7aa52 364 * @param[out] *pSinVal points to the processed sine output.
emilmont 1:fdd22bb7aa52 365 * @param[out] *pCosVal points to the processed cos output.
emilmont 1:fdd22bb7aa52 366 * @return none.
emilmont 1:fdd22bb7aa52 367 */
emilmont 1:fdd22bb7aa52 368
emilmont 1:fdd22bb7aa52 369
emilmont 1:fdd22bb7aa52 370 void arm_sin_cos_f32(
emilmont 1:fdd22bb7aa52 371 float32_t theta,
emilmont 1:fdd22bb7aa52 372 float32_t * pSinVal,
emilmont 1:fdd22bb7aa52 373 float32_t * pCosVal)
emilmont 1:fdd22bb7aa52 374 {
emilmont 1:fdd22bb7aa52 375 int32_t i; /* Index for reading nearwst output values */
emilmont 1:fdd22bb7aa52 376 float32_t x1 = -179.0f; /* Initial input value */
emilmont 1:fdd22bb7aa52 377 float32_t y0, y1; /* nearest output values */
emilmont 1:fdd22bb7aa52 378 float32_t y2, y3;
emilmont 1:fdd22bb7aa52 379 float32_t fract; /* fractional part of input */
emilmont 1:fdd22bb7aa52 380
emilmont 1:fdd22bb7aa52 381 /* Calculation of fractional part */
emilmont 1:fdd22bb7aa52 382 if(theta > 0.0f)
emilmont 1:fdd22bb7aa52 383 {
emilmont 1:fdd22bb7aa52 384 fract = theta - (float32_t) ((int32_t) theta);
emilmont 1:fdd22bb7aa52 385 }
emilmont 1:fdd22bb7aa52 386 else
emilmont 1:fdd22bb7aa52 387 {
emilmont 1:fdd22bb7aa52 388 fract = (theta - (float32_t) ((int32_t) theta)) + 1.0f;
emilmont 1:fdd22bb7aa52 389 }
emilmont 1:fdd22bb7aa52 390
emilmont 1:fdd22bb7aa52 391 /* index calculation for reading nearest output values */
emilmont 1:fdd22bb7aa52 392 i = (uint32_t) (theta - x1);
emilmont 1:fdd22bb7aa52 393
emilmont 1:fdd22bb7aa52 394 /* Checking min and max index of table */
emilmont 1:fdd22bb7aa52 395 if(i < 0)
emilmont 1:fdd22bb7aa52 396 {
emilmont 1:fdd22bb7aa52 397 i = 0;
emilmont 1:fdd22bb7aa52 398 }
emilmont 1:fdd22bb7aa52 399 else if(i >= 359)
emilmont 1:fdd22bb7aa52 400 {
emilmont 1:fdd22bb7aa52 401 i = 358;
emilmont 1:fdd22bb7aa52 402 }
emilmont 1:fdd22bb7aa52 403
emilmont 1:fdd22bb7aa52 404 /* reading nearest sine output values */
emilmont 1:fdd22bb7aa52 405 y0 = sinTable[i];
emilmont 1:fdd22bb7aa52 406 y1 = sinTable[i + 1u];
emilmont 1:fdd22bb7aa52 407
emilmont 1:fdd22bb7aa52 408 /* reading nearest cosine output values */
emilmont 1:fdd22bb7aa52 409 y2 = cosTable[i];
emilmont 1:fdd22bb7aa52 410 y3 = cosTable[i + 1u];
emilmont 1:fdd22bb7aa52 411
emilmont 1:fdd22bb7aa52 412 y1 = y1 - y0;
emilmont 1:fdd22bb7aa52 413 y3 = y3 - y2;
emilmont 1:fdd22bb7aa52 414
emilmont 1:fdd22bb7aa52 415 y1 = fract * y1;
emilmont 1:fdd22bb7aa52 416 y3 = fract * y3;
emilmont 1:fdd22bb7aa52 417
emilmont 1:fdd22bb7aa52 418 /* Calculation of sine value */
emilmont 1:fdd22bb7aa52 419 *pSinVal = y0 + y1;
emilmont 1:fdd22bb7aa52 420
emilmont 1:fdd22bb7aa52 421 /* Calculation of cosine value */
emilmont 1:fdd22bb7aa52 422 *pCosVal = y2 + y3;
emilmont 1:fdd22bb7aa52 423
emilmont 1:fdd22bb7aa52 424 }
emilmont 1:fdd22bb7aa52 425
emilmont 1:fdd22bb7aa52 426 /**
emilmont 1:fdd22bb7aa52 427 * @} end of SinCos group
emilmont 1:fdd22bb7aa52 428 */