1 /* ----------------------------------------------------------------------
2 * Copyright (C) 2010-2013 ARM Limited. All rights reserved.
4 * $Date: 17. January 2013
7 * Project: CMSIS DSP Library
8 * Title: arm_sin_cos_f32.c
10 * Description: Sine and Cosine calculation for floating-point values.
12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * - Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * - Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in
21 * the documentation and/or other materials provided with the
23 * - Neither the name of ARM LIMITED nor the names of its contributors
24 * may be used to endorse or promote products derived from this
25 * software without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38 * POSSIBILITY OF SUCH DAMAGE.
39 * -------------------------------------------------------------------- */
44 * @ingroup groupController
48 * @defgroup SinCos Sine Cosine
50 * Computes the trigonometric sine and cosine values using a combination of table lookup
51 * and linear interpolation.
52 * There are separate functions for Q31 and floating-point data types.
53 * The input to the floating-point version is in degrees while the
54 * fixed-point Q31 have a scaled input with the range
55 * [-1 0.9999] mapping to [-180 179] degrees.
57 * The implementation is based on table lookup using 360 values together with linear interpolation.
59 * -# Calculation of the nearest integer table index.
60 * -# Compute the fractional portion (fract) of the input.
61 * -# Fetch the value corresponding to \c index from sine table to \c y0 and also value from \c index+1 to \c y1.
62 * -# Sine value is computed as <code> *psinVal = y0 + (fract * (y1 - y0))</code>.
63 * -# Fetch the value corresponding to \c index from cosine table to \c y0 and also value from \c index+1 to \c y1.
64 * -# Cosine value is computed as <code> *pcosVal = y0 + (fract * (y1 - y0))</code>.
75 * Cosine Table is generated from following loop
76 * <pre>for(i = 0; i < 360; i++)
78 * cosTable[i]= cos((i-180) * PI/180.0);
82 static const float32_t cosTable[360] = {
83 -0.999847695156391270f, -0.999390827019095760f, -0.998629534754573830f,
84 -0.997564050259824200f, -0.996194698091745550f, -0.994521895368273290f,
85 -0.992546151641321980f, -0.990268068741570250f,
86 -0.987688340595137660f, -0.984807753012208020f, -0.981627183447663980f,
87 -0.978147600733805690f, -0.974370064785235250f, -0.970295726275996470f,
88 -0.965925826289068200f, -0.961261695938318670f,
89 -0.956304755963035440f, -0.951056516295153530f, -0.945518575599316740f,
90 -0.939692620785908320f, -0.933580426497201740f, -0.927183854566787310f,
91 -0.920504853452440150f, -0.913545457642600760f,
92 -0.906307787036649940f, -0.898794046299167040f, -0.891006524188367790f,
93 -0.882947592858926770f, -0.874619707139395740f, -0.866025403784438710f,
94 -0.857167300702112220f, -0.848048096156425960f,
95 -0.838670567945424160f, -0.829037572555041620f, -0.819152044288991580f,
96 -0.809016994374947340f, -0.798635510047292940f, -0.788010753606721900f,
97 -0.777145961456970680f, -0.766044443118977900f,
98 -0.754709580222772010f, -0.743144825477394130f, -0.731353701619170460f,
99 -0.719339800338651300f, -0.707106781186547460f, -0.694658370458997030f,
100 -0.681998360062498370f, -0.669130606358858240f,
101 -0.656059028990507500f, -0.642787609686539360f, -0.629320391049837280f,
102 -0.615661475325658290f, -0.601815023152048380f, -0.587785252292473030f,
103 -0.573576436351045830f, -0.559192903470746680f,
104 -0.544639035015027080f, -0.529919264233204790f, -0.515038074910054270f,
105 -0.499999999999999780f, -0.484809620246337000f, -0.469471562785890530f,
106 -0.453990499739546750f, -0.438371146789077510f,
107 -0.422618261740699330f, -0.406736643075800100f, -0.390731128489273600f,
108 -0.374606593415912070f, -0.358367949545300270f, -0.342020143325668710f,
109 -0.325568154457156420f, -0.309016994374947340f,
110 -0.292371704722736660f, -0.275637355816999050f, -0.258819045102520850f,
111 -0.241921895599667790f, -0.224951054343864810f, -0.207911690817759120f,
112 -0.190808995376544800f, -0.173648177666930300f,
113 -0.156434465040231040f, -0.139173100960065350f, -0.121869343405147370f,
114 -0.104528463267653330f, -0.087155742747658235f, -0.069756473744125330f,
115 -0.052335956242943620f, -0.034899496702500733f,
116 -0.017452406437283477f, 0.000000000000000061f, 0.017452406437283376f,
117 0.034899496702501080f, 0.052335956242943966f, 0.069756473744125455f,
118 0.087155742747658138f, 0.104528463267653460f,
119 0.121869343405147490f, 0.139173100960065690f, 0.156434465040230920f,
120 0.173648177666930410f, 0.190808995376544920f, 0.207911690817759450f,
121 0.224951054343864920f, 0.241921895599667900f,
122 0.258819045102520740f, 0.275637355816999160f, 0.292371704722736770f,
123 0.309016994374947450f, 0.325568154457156760f, 0.342020143325668820f,
124 0.358367949545300380f, 0.374606593415911960f,
125 0.390731128489273940f, 0.406736643075800210f, 0.422618261740699440f,
126 0.438371146789077460f, 0.453990499739546860f, 0.469471562785890860f,
127 0.484809620246337110f, 0.500000000000000110f,
128 0.515038074910054380f, 0.529919264233204900f, 0.544639035015027200f,
129 0.559192903470746790f, 0.573576436351046050f, 0.587785252292473140f,
130 0.601815023152048270f, 0.615661475325658290f,
131 0.629320391049837500f, 0.642787609686539360f, 0.656059028990507280f,
132 0.669130606358858240f, 0.681998360062498480f, 0.694658370458997370f,
133 0.707106781186547570f, 0.719339800338651190f,
134 0.731353701619170570f, 0.743144825477394240f, 0.754709580222772010f,
135 0.766044443118978010f, 0.777145961456970900f, 0.788010753606722010f,
136 0.798635510047292830f, 0.809016994374947450f,
137 0.819152044288991800f, 0.829037572555041620f, 0.838670567945424050f,
138 0.848048096156425960f, 0.857167300702112330f, 0.866025403784438710f,
139 0.874619707139395740f, 0.882947592858926990f,
140 0.891006524188367900f, 0.898794046299167040f, 0.906307787036649940f,
141 0.913545457642600870f, 0.920504853452440370f, 0.927183854566787420f,
142 0.933580426497201740f, 0.939692620785908430f,
143 0.945518575599316850f, 0.951056516295153530f, 0.956304755963035440f,
144 0.961261695938318890f, 0.965925826289068310f, 0.970295726275996470f,
145 0.974370064785235250f, 0.978147600733805690f,
146 0.981627183447663980f, 0.984807753012208020f, 0.987688340595137770f,
147 0.990268068741570360f, 0.992546151641321980f, 0.994521895368273290f,
148 0.996194698091745550f, 0.997564050259824200f,
149 0.998629534754573830f, 0.999390827019095760f, 0.999847695156391270f,
150 1.000000000000000000f, 0.999847695156391270f, 0.999390827019095760f,
151 0.998629534754573830f, 0.997564050259824200f,
152 0.996194698091745550f, 0.994521895368273290f, 0.992546151641321980f,
153 0.990268068741570360f, 0.987688340595137770f, 0.984807753012208020f,
154 0.981627183447663980f, 0.978147600733805690f,
155 0.974370064785235250f, 0.970295726275996470f, 0.965925826289068310f,
156 0.961261695938318890f, 0.956304755963035440f, 0.951056516295153530f,
157 0.945518575599316850f, 0.939692620785908430f,
158 0.933580426497201740f, 0.927183854566787420f, 0.920504853452440370f,
159 0.913545457642600870f, 0.906307787036649940f, 0.898794046299167040f,
160 0.891006524188367900f, 0.882947592858926990f,
161 0.874619707139395740f, 0.866025403784438710f, 0.857167300702112330f,
162 0.848048096156425960f, 0.838670567945424050f, 0.829037572555041620f,
163 0.819152044288991800f, 0.809016994374947450f,
164 0.798635510047292830f, 0.788010753606722010f, 0.777145961456970900f,
165 0.766044443118978010f, 0.754709580222772010f, 0.743144825477394240f,
166 0.731353701619170570f, 0.719339800338651190f,
167 0.707106781186547570f, 0.694658370458997370f, 0.681998360062498480f,
168 0.669130606358858240f, 0.656059028990507280f, 0.642787609686539360f,
169 0.629320391049837500f, 0.615661475325658290f,
170 0.601815023152048270f, 0.587785252292473140f, 0.573576436351046050f,
171 0.559192903470746790f, 0.544639035015027200f, 0.529919264233204900f,
172 0.515038074910054380f, 0.500000000000000110f,
173 0.484809620246337110f, 0.469471562785890860f, 0.453990499739546860f,
174 0.438371146789077460f, 0.422618261740699440f, 0.406736643075800210f,
175 0.390731128489273940f, 0.374606593415911960f,
176 0.358367949545300380f, 0.342020143325668820f, 0.325568154457156760f,
177 0.309016994374947450f, 0.292371704722736770f, 0.275637355816999160f,
178 0.258819045102520740f, 0.241921895599667900f,
179 0.224951054343864920f, 0.207911690817759450f, 0.190808995376544920f,
180 0.173648177666930410f, 0.156434465040230920f, 0.139173100960065690f,
181 0.121869343405147490f, 0.104528463267653460f,
182 0.087155742747658138f, 0.069756473744125455f, 0.052335956242943966f,
183 0.034899496702501080f, 0.017452406437283376f, 0.000000000000000061f,
184 -0.017452406437283477f, -0.034899496702500733f,
185 -0.052335956242943620f, -0.069756473744125330f, -0.087155742747658235f,
186 -0.104528463267653330f, -0.121869343405147370f, -0.139173100960065350f,
187 -0.156434465040231040f, -0.173648177666930300f,
188 -0.190808995376544800f, -0.207911690817759120f, -0.224951054343864810f,
189 -0.241921895599667790f, -0.258819045102520850f, -0.275637355816999050f,
190 -0.292371704722736660f, -0.309016994374947340f,
191 -0.325568154457156420f, -0.342020143325668710f, -0.358367949545300270f,
192 -0.374606593415912070f, -0.390731128489273600f, -0.406736643075800100f,
193 -0.422618261740699330f, -0.438371146789077510f,
194 -0.453990499739546750f, -0.469471562785890530f, -0.484809620246337000f,
195 -0.499999999999999780f, -0.515038074910054270f, -0.529919264233204790f,
196 -0.544639035015027080f, -0.559192903470746680f,
197 -0.573576436351045830f, -0.587785252292473030f, -0.601815023152048380f,
198 -0.615661475325658290f, -0.629320391049837280f, -0.642787609686539360f,
199 -0.656059028990507500f, -0.669130606358858240f,
200 -0.681998360062498370f, -0.694658370458997030f, -0.707106781186547460f,
201 -0.719339800338651300f, -0.731353701619170460f, -0.743144825477394130f,
202 -0.754709580222772010f, -0.766044443118977900f,
203 -0.777145961456970680f, -0.788010753606721900f, -0.798635510047292940f,
204 -0.809016994374947340f, -0.819152044288991580f, -0.829037572555041620f,
205 -0.838670567945424160f, -0.848048096156425960f,
206 -0.857167300702112220f, -0.866025403784438710f, -0.874619707139395740f,
207 -0.882947592858926770f, -0.891006524188367790f, -0.898794046299167040f,
208 -0.906307787036649940f, -0.913545457642600760f,
209 -0.920504853452440150f, -0.927183854566787310f, -0.933580426497201740f,
210 -0.939692620785908320f, -0.945518575599316740f, -0.951056516295153530f,
211 -0.956304755963035440f, -0.961261695938318670f,
212 -0.965925826289068200f, -0.970295726275996470f, -0.974370064785235250f,
213 -0.978147600733805690f, -0.981627183447663980f, -0.984807753012208020f,
214 -0.987688340595137660f, -0.990268068741570250f,
215 -0.992546151641321980f, -0.994521895368273290f, -0.996194698091745550f,
216 -0.997564050259824200f, -0.998629534754573830f, -0.999390827019095760f,
217 -0.999847695156391270f, -1.000000000000000000f
222 * Sine Table is generated from following loop
223 * <pre>for(i = 0; i < 360; i++)
225 * sinTable[i]= sin((i-180) * PI/180.0);
230 static const float32_t sinTable[360] = {
231 -0.017452406437283439f, -0.034899496702500699f, -0.052335956242943807f,
232 -0.069756473744125524f, -0.087155742747658638f, -0.104528463267653730f,
233 -0.121869343405147550f, -0.139173100960065740f,
234 -0.156434465040230980f, -0.173648177666930280f, -0.190808995376544970f,
235 -0.207911690817759310f, -0.224951054343864780f, -0.241921895599667730f,
236 -0.258819045102521020f, -0.275637355816999660f,
237 -0.292371704722737050f, -0.309016994374947510f, -0.325568154457156980f,
238 -0.342020143325668880f, -0.358367949545300210f, -0.374606593415912240f,
239 -0.390731128489274160f, -0.406736643075800430f,
240 -0.422618261740699500f, -0.438371146789077290f, -0.453990499739546860f,
241 -0.469471562785891080f, -0.484809620246337170f, -0.499999999999999940f,
242 -0.515038074910054380f, -0.529919264233204900f,
243 -0.544639035015026860f, -0.559192903470746900f, -0.573576436351046380f,
244 -0.587785252292473250f, -0.601815023152048160f, -0.615661475325658400f,
245 -0.629320391049837720f, -0.642787609686539470f,
246 -0.656059028990507280f, -0.669130606358858350f, -0.681998360062498590f,
247 -0.694658370458997140f, -0.707106781186547570f, -0.719339800338651410f,
248 -0.731353701619170570f, -0.743144825477394240f,
249 -0.754709580222771790f, -0.766044443118978010f, -0.777145961456971010f,
250 -0.788010753606722010f, -0.798635510047292720f, -0.809016994374947450f,
251 -0.819152044288992020f, -0.829037572555041740f,
252 -0.838670567945424050f, -0.848048096156426070f, -0.857167300702112330f,
253 -0.866025403784438710f, -0.874619707139395850f, -0.882947592858927100f,
254 -0.891006524188367900f, -0.898794046299166930f,
255 -0.906307787036650050f, -0.913545457642600980f, -0.920504853452440370f,
256 -0.927183854566787420f, -0.933580426497201740f, -0.939692620785908430f,
257 -0.945518575599316850f, -0.951056516295153640f,
258 -0.956304755963035550f, -0.961261695938318890f, -0.965925826289068310f,
259 -0.970295726275996470f, -0.974370064785235250f, -0.978147600733805690f,
260 -0.981627183447663980f, -0.984807753012208020f,
261 -0.987688340595137660f, -0.990268068741570360f, -0.992546151641322090f,
262 -0.994521895368273400f, -0.996194698091745550f, -0.997564050259824200f,
263 -0.998629534754573830f, -0.999390827019095760f,
264 -0.999847695156391270f, -1.000000000000000000f, -0.999847695156391270f,
265 -0.999390827019095760f, -0.998629534754573830f, -0.997564050259824200f,
266 -0.996194698091745550f, -0.994521895368273290f,
267 -0.992546151641321980f, -0.990268068741570250f, -0.987688340595137770f,
268 -0.984807753012208020f, -0.981627183447663980f, -0.978147600733805580f,
269 -0.974370064785235250f, -0.970295726275996470f,
270 -0.965925826289068310f, -0.961261695938318890f, -0.956304755963035440f,
271 -0.951056516295153530f, -0.945518575599316740f, -0.939692620785908320f,
272 -0.933580426497201740f, -0.927183854566787420f,
273 -0.920504853452440260f, -0.913545457642600870f, -0.906307787036649940f,
274 -0.898794046299167040f, -0.891006524188367790f, -0.882947592858926880f,
275 -0.874619707139395740f, -0.866025403784438600f,
276 -0.857167300702112220f, -0.848048096156426070f, -0.838670567945423940f,
277 -0.829037572555041740f, -0.819152044288991800f, -0.809016994374947450f,
278 -0.798635510047292830f, -0.788010753606722010f,
279 -0.777145961456970790f, -0.766044443118978010f, -0.754709580222772010f,
280 -0.743144825477394240f, -0.731353701619170460f, -0.719339800338651080f,
281 -0.707106781186547460f, -0.694658370458997250f,
282 -0.681998360062498480f, -0.669130606358858240f, -0.656059028990507160f,
283 -0.642787609686539250f, -0.629320391049837390f, -0.615661475325658180f,
284 -0.601815023152048270f, -0.587785252292473140f,
285 -0.573576436351046050f, -0.559192903470746900f, -0.544639035015027080f,
286 -0.529919264233204900f, -0.515038074910054160f, -0.499999999999999940f,
287 -0.484809620246337060f, -0.469471562785890810f,
288 -0.453990499739546750f, -0.438371146789077400f, -0.422618261740699440f,
289 -0.406736643075800150f, -0.390731128489273720f, -0.374606593415912010f,
290 -0.358367949545300270f, -0.342020143325668710f,
291 -0.325568154457156640f, -0.309016994374947400f, -0.292371704722736770f,
292 -0.275637355816999160f, -0.258819045102520740f, -0.241921895599667730f,
293 -0.224951054343865000f, -0.207911690817759310f,
294 -0.190808995376544800f, -0.173648177666930330f, -0.156434465040230870f,
295 -0.139173100960065440f, -0.121869343405147480f, -0.104528463267653460f,
296 -0.087155742747658166f, -0.069756473744125302f,
297 -0.052335956242943828f, -0.034899496702500969f, -0.017452406437283512f,
298 0.000000000000000000f, 0.017452406437283512f, 0.034899496702500969f,
299 0.052335956242943828f, 0.069756473744125302f,
300 0.087155742747658166f, 0.104528463267653460f, 0.121869343405147480f,
301 0.139173100960065440f, 0.156434465040230870f, 0.173648177666930330f,
302 0.190808995376544800f, 0.207911690817759310f,
303 0.224951054343865000f, 0.241921895599667730f, 0.258819045102520740f,
304 0.275637355816999160f, 0.292371704722736770f, 0.309016994374947400f,
305 0.325568154457156640f, 0.342020143325668710f,
306 0.358367949545300270f, 0.374606593415912010f, 0.390731128489273720f,
307 0.406736643075800150f, 0.422618261740699440f, 0.438371146789077400f,
308 0.453990499739546750f, 0.469471562785890810f,
309 0.484809620246337060f, 0.499999999999999940f, 0.515038074910054160f,
310 0.529919264233204900f, 0.544639035015027080f, 0.559192903470746900f,
311 0.573576436351046050f, 0.587785252292473140f,
312 0.601815023152048270f, 0.615661475325658180f, 0.629320391049837390f,
313 0.642787609686539250f, 0.656059028990507160f, 0.669130606358858240f,
314 0.681998360062498480f, 0.694658370458997250f,
315 0.707106781186547460f, 0.719339800338651080f, 0.731353701619170460f,
316 0.743144825477394240f, 0.754709580222772010f, 0.766044443118978010f,
317 0.777145961456970790f, 0.788010753606722010f,
318 0.798635510047292830f, 0.809016994374947450f, 0.819152044288991800f,
319 0.829037572555041740f, 0.838670567945423940f, 0.848048096156426070f,
320 0.857167300702112220f, 0.866025403784438600f,
321 0.874619707139395740f, 0.882947592858926880f, 0.891006524188367790f,
322 0.898794046299167040f, 0.906307787036649940f, 0.913545457642600870f,
323 0.920504853452440260f, 0.927183854566787420f,
324 0.933580426497201740f, 0.939692620785908320f, 0.945518575599316740f,
325 0.951056516295153530f, 0.956304755963035440f, 0.961261695938318890f,
326 0.965925826289068310f, 0.970295726275996470f,
327 0.974370064785235250f, 0.978147600733805580f, 0.981627183447663980f,
328 0.984807753012208020f, 0.987688340595137770f, 0.990268068741570250f,
329 0.992546151641321980f, 0.994521895368273290f,
330 0.996194698091745550f, 0.997564050259824200f, 0.998629534754573830f,
331 0.999390827019095760f, 0.999847695156391270f, 1.000000000000000000f,
332 0.999847695156391270f, 0.999390827019095760f,
333 0.998629534754573830f, 0.997564050259824200f, 0.996194698091745550f,
334 0.994521895368273400f, 0.992546151641322090f, 0.990268068741570360f,
335 0.987688340595137660f, 0.984807753012208020f,
336 0.981627183447663980f, 0.978147600733805690f, 0.974370064785235250f,
337 0.970295726275996470f, 0.965925826289068310f, 0.961261695938318890f,
338 0.956304755963035550f, 0.951056516295153640f,
339 0.945518575599316850f, 0.939692620785908430f, 0.933580426497201740f,
340 0.927183854566787420f, 0.920504853452440370f, 0.913545457642600980f,
341 0.906307787036650050f, 0.898794046299166930f,
342 0.891006524188367900f, 0.882947592858927100f, 0.874619707139395850f,
343 0.866025403784438710f, 0.857167300702112330f, 0.848048096156426070f,
344 0.838670567945424050f, 0.829037572555041740f,
345 0.819152044288992020f, 0.809016994374947450f, 0.798635510047292720f,
346 0.788010753606722010f, 0.777145961456971010f, 0.766044443118978010f,
347 0.754709580222771790f, 0.743144825477394240f,
348 0.731353701619170570f, 0.719339800338651410f, 0.707106781186547570f,
349 0.694658370458997140f, 0.681998360062498590f, 0.669130606358858350f,
350 0.656059028990507280f, 0.642787609686539470f,
351 0.629320391049837720f, 0.615661475325658400f, 0.601815023152048160f,
352 0.587785252292473250f, 0.573576436351046380f, 0.559192903470746900f,
353 0.544639035015026860f, 0.529919264233204900f,
354 0.515038074910054380f, 0.499999999999999940f, 0.484809620246337170f,
355 0.469471562785891080f, 0.453990499739546860f, 0.438371146789077290f,
356 0.422618261740699500f, 0.406736643075800430f,
357 0.390731128489274160f, 0.374606593415912240f, 0.358367949545300210f,
358 0.342020143325668880f, 0.325568154457156980f, 0.309016994374947510f,
359 0.292371704722737050f, 0.275637355816999660f,
360 0.258819045102521020f, 0.241921895599667730f, 0.224951054343864780f,
361 0.207911690817759310f, 0.190808995376544970f, 0.173648177666930280f,
362 0.156434465040230980f, 0.139173100960065740f,
363 0.121869343405147550f, 0.104528463267653730f, 0.087155742747658638f,
364 0.069756473744125524f, 0.052335956242943807f, 0.034899496702500699f,
365 0.017452406437283439f, 0.000000000000000122f
370 * @brief Floating-point sin_cos function.
371 * @param[in] theta input value in degrees
372 * @param[out] *pSinVal points to the processed sine output.
373 * @param[out] *pCosVal points to the processed cos output.
378 void arm_sin_cos_f32(
383 int32_t i; /* Index for reading nearwst output values */
384 float32_t x1 = -179.0f; /* Initial input value */
385 float32_t y0, y1; /* nearest output values */
387 float32_t fract; /* fractional part of input */
389 /* Calculation of fractional part */
392 fract = theta - (float32_t) ((int32_t) theta);
396 fract = (theta - (float32_t) ((int32_t) theta)) + 1.0f;
399 /* index calculation for reading nearest output values */
400 i = (uint32_t) (theta - x1);
402 /* Checking min and max index of table */
412 /* reading nearest sine output values */
414 y1 = sinTable[i + 1u];
416 /* reading nearest cosine output values */
418 y3 = cosTable[i + 1u];
426 /* Calculation of sine value */
429 /* Calculation of cosine value */
435 * @} end of SinCos group