CMSIS DSP Software Library: arm_cfft_radix4_init_f32.c Source File
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arm_cfft_radix4_init_f32.c
Go to the documentation of this file.00001 /* ----------------------------------------------------------------------
00002 * Copyright (C) 2010 ARM Limited. All rights reserved.
00003 *
00004 * $Date: 29. November 2010
00005 * $Revision: V1.0.3
00006 *
00007 * Project: CMSIS DSP Library
00008 * Title: arm_cfft_radix4_init_f32.c
00009 *
00010 * Description: Radix-4 Decimation in Frequency Floating-point CFFT & CIFFT Initialization function
00011 *
00012 * Target Processor: Cortex-M4/Cortex-M3
00013 *
00014 * Version 1.0.3 2010/11/29
00015 * Re-organized the CMSIS folders and updated documentation.
00016 *
00017 * Version 1.0.2 2010/11/11
00018 * Documentation updated.
00019 *
00020 * Version 1.0.1 2010/10/05
00021 * Production release and review comments incorporated.
00022 *
00023 * Version 1.0.0 2010/09/20
00024 * Production release and review comments incorporated.
00025 *
00026 * Version 0.0.5 2010/04/26
00027 * incorporated review comments and updated with latest CMSIS layer
00028 *
00029 * Version 0.0.3 2010/03/10
00030 * Initial version
00031 * -------------------------------------------------------------------- */
00032
00033
00034 #include "arm_math.h"
00035 #include "arm_common_tables.h"
00036
00046 /*
00047 * @brief Floating-point Twiddle factors Table Generation
00048 */
00049
00050
00067 static const float32_t twiddleCoef[2048] = {
00068 1.000000000000000000f, 0.000000000000000000f,
00069 0.999981175282601110f, 0.006135884649154475f,
00070 0.999924701839144500f, 0.012271538285719925f,
00071 0.999830581795823400f, 0.018406729905804820f,
00072 0.999698818696204250f, 0.024541228522912288f,
00073 0.999529417501093140f, 0.030674803176636626f,
00074 0.999322384588349540f, 0.036807222941358832f,
00075 0.999077727752645360f, 0.042938256934940820f,
00076 0.998795456205172410f, 0.049067674327418015f,
00077 0.998475580573294770f, 0.055195244349689934f,
00078 0.998118112900149180f, 0.061320736302208578f,
00079 0.997723066644191640f, 0.067443919563664051f,
00080 0.997290456678690210f, 0.073564563599667426f,
00081 0.996820299291165670f, 0.079682437971430126f,
00082 0.996312612182778000f, 0.085797312344439894f,
00083 0.995767414467659820f, 0.091908956497132724f,
00084 0.995184726672196930f, 0.098017140329560604f,
00085 0.994564570734255420f, 0.104121633872054590f,
00086 0.993906970002356060f, 0.110222207293883060f,
00087 0.993211949234794500f, 0.116318630911904750f,
00088 0.992479534598709970f, 0.122410675199216200f,
00089 0.991709753669099530f, 0.128498110793793170f,
00090 0.990902635427780010f, 0.134580708507126170f,
00091 0.990058210262297120f, 0.140658239332849210f,
00092 0.989176509964781010f, 0.146730474455361750f,
00093 0.988257567730749460f, 0.152797185258443440f,
00094 0.987301418157858430f, 0.158858143333861450f,
00095 0.986308097244598670f, 0.164913120489969890f,
00096 0.985277642388941220f, 0.170961888760301220f,
00097 0.984210092386929030f, 0.177004220412148750f,
00098 0.983105487431216290f, 0.183039887955140950f,
00099 0.981963869109555240f, 0.189068664149806190f,
00100 0.980785280403230430f, 0.195090322016128250f,
00101 0.979569765685440520f, 0.201104634842091900f,
00102 0.978317370719627650f, 0.207111376192218560f,
00103 0.977028142657754390f, 0.213110319916091360f,
00104 0.975702130038528570f, 0.219101240156869800f,
00105 0.974339382785575860f, 0.225083911359792830f,
00106 0.972939952205560180f, 0.231058108280671110f,
00107 0.971503890986251780f, 0.237023605994367200f,
00108 0.970031253194543970f, 0.242980179903263870f,
00109 0.968522094274417380f, 0.248927605745720150f,
00110 0.966976471044852070f, 0.254865659604514570f,
00111 0.965394441697689400f, 0.260794117915275510f,
00112 0.963776065795439840f, 0.266712757474898370f,
00113 0.962121404269041580f, 0.272621355449948980f,
00114 0.960430519415565790f, 0.278519689385053060f,
00115 0.958703474895871600f, 0.284407537211271880f,
00116 0.956940335732208820f, 0.290284677254462330f,
00117 0.955141168305770780f, 0.296150888243623790f,
00118 0.953306040354193860f, 0.302005949319228080f,
00119 0.951435020969008340f, 0.307849640041534870f,
00120 0.949528180593036670f, 0.313681740398891520f,
00121 0.947585591017741090f, 0.319502030816015690f,
00122 0.945607325380521280f, 0.325310292162262930f,
00123 0.943593458161960390f, 0.331106305759876430f,
00124 0.941544065183020810f, 0.336889853392220050f,
00125 0.939459223602189920f, 0.342660717311994380f,
00126 0.937339011912574960f, 0.348418680249434560f,
00127 0.935183509938947610f, 0.354163525420490340f,
00128 0.932992798834738960f, 0.359895036534988110f,
00129 0.930766961078983710f, 0.365612997804773850f,
00130 0.928506080473215590f, 0.371317193951837540f,
00131 0.926210242138311380f, 0.377007410216418260f,
00132 0.923879532511286740f, 0.382683432365089780f,
00133 0.921514039342042010f, 0.388345046698826250f,
00134 0.919113851690057770f, 0.393992040061048100f,
00135 0.916679059921042700f, 0.399624199845646790f,
00136 0.914209755703530690f, 0.405241314004989860f,
00137 0.911706032005429880f, 0.410843171057903910f,
00138 0.909167983090522380f, 0.416429560097637150f,
00139 0.906595704514915330f, 0.422000270799799680f,
00140 0.903989293123443340f, 0.427555093430282080f,
00141 0.901348847046022030f, 0.433093818853151960f,
00142 0.898674465693953820f, 0.438616238538527660f,
00143 0.895966249756185220f, 0.444122144570429200f,
00144 0.893224301195515320f, 0.449611329654606540f,
00145 0.890448723244757880f, 0.455083587126343840f,
00146 0.887639620402853930f, 0.460538710958240010f,
00147 0.884797098430937790f, 0.465976495767966180f,
00148 0.881921264348355050f, 0.471396736825997640f,
00149 0.879012226428633530f, 0.476799230063322090f,
00150 0.876070094195406600f, 0.482183772079122720f,
00151 0.873094978418290090f, 0.487550160148436000f,
00152 0.870086991108711460f, 0.492898192229784040f,
00153 0.867046245515692650f, 0.498227666972781870f,
00154 0.863972856121586810f, 0.503538383725717580f,
00155 0.860866938637767310f, 0.508830142543106990f,
00156 0.857728610000272120f, 0.514102744193221660f,
00157 0.854557988365400530f, 0.519355990165589640f,
00158 0.851355193105265200f, 0.524589682678468950f,
00159 0.848120344803297230f, 0.529803624686294610f,
00160 0.844853565249707120f, 0.534997619887097150f,
00161 0.841554977436898440f, 0.540171472729892850f,
00162 0.838224705554838080f, 0.545324988422046460f,
00163 0.834862874986380010f, 0.550457972936604810f,
00164 0.831469612302545240f, 0.555570233019602180f,
00165 0.828045045257755800f, 0.560661576197336030f,
00166 0.824589302785025290f, 0.565731810783613120f,
00167 0.821102514991104650f, 0.570780745886967260f,
00168 0.817584813151583710f, 0.575808191417845340f,
00169 0.814036329705948410f, 0.580813958095764530f,
00170 0.810457198252594770f, 0.585797857456438860f,
00171 0.806847553543799330f, 0.590759701858874160f,
00172 0.803207531480644940f, 0.595699304492433360f,
00173 0.799537269107905010f, 0.600616479383868970f,
00174 0.795836904608883570f, 0.605511041404325550f,
00175 0.792106577300212390f, 0.610382806276309480f,
00176 0.788346427626606340f, 0.615231590580626820f,
00177 0.784556597155575240f, 0.620057211763289100f,
00178 0.780737228572094490f, 0.624859488142386340f,
00179 0.776888465673232440f, 0.629638238914926980f,
00180 0.773010453362736990f, 0.634393284163645490f,
00181 0.769103337645579700f, 0.639124444863775730f,
00182 0.765167265622458960f, 0.643831542889791390f,
00183 0.761202385484261780f, 0.648514401022112440f,
00184 0.757208846506484570f, 0.653172842953776760f,
00185 0.753186799043612520f, 0.657806693297078640f,
00186 0.749136394523459370f, 0.662415777590171780f,
00187 0.745057785441466060f, 0.666999922303637470f,
00188 0.740951125354959110f, 0.671558954847018330f,
00189 0.736816568877369900f, 0.676092703575315920f,
00190 0.732654271672412820f, 0.680600997795453020f,
00191 0.728464390448225200f, 0.685083667772700360f,
00192 0.724247082951467000f, 0.689540544737066830f,
00193 0.720002507961381650f, 0.693971460889654000f,
00194 0.715730825283818590f, 0.698376249408972920f,
00195 0.711432195745216430f, 0.702754744457225300f,
00196 0.707106781186547570f, 0.707106781186547460f,
00197 0.702754744457225300f, 0.711432195745216430f,
00198 0.698376249408972920f, 0.715730825283818590f,
00199 0.693971460889654000f, 0.720002507961381650f,
00200 0.689540544737066940f, 0.724247082951466890f,
00201 0.685083667772700360f, 0.728464390448225200f,
00202 0.680600997795453130f, 0.732654271672412820f,
00203 0.676092703575316030f, 0.736816568877369790f,
00204 0.671558954847018330f, 0.740951125354959110f,
00205 0.666999922303637470f, 0.745057785441465950f,
00206 0.662415777590171780f, 0.749136394523459260f,
00207 0.657806693297078640f, 0.753186799043612410f,
00208 0.653172842953776760f, 0.757208846506484460f,
00209 0.648514401022112550f, 0.761202385484261780f,
00210 0.643831542889791500f, 0.765167265622458960f,
00211 0.639124444863775730f, 0.769103337645579590f,
00212 0.634393284163645490f, 0.773010453362736990f,
00213 0.629638238914927100f, 0.776888465673232440f,
00214 0.624859488142386450f, 0.780737228572094380f,
00215 0.620057211763289210f, 0.784556597155575240f,
00216 0.615231590580626820f, 0.788346427626606230f,
00217 0.610382806276309480f, 0.792106577300212390f,
00218 0.605511041404325550f, 0.795836904608883460f,
00219 0.600616479383868970f, 0.799537269107905010f,
00220 0.595699304492433470f, 0.803207531480644830f,
00221 0.590759701858874280f, 0.806847553543799220f,
00222 0.585797857456438860f, 0.810457198252594770f,
00223 0.580813958095764530f, 0.814036329705948300f,
00224 0.575808191417845340f, 0.817584813151583710f,
00225 0.570780745886967370f, 0.821102514991104650f,
00226 0.565731810783613230f, 0.824589302785025290f,
00227 0.560661576197336030f, 0.828045045257755800f,
00228 0.555570233019602290f, 0.831469612302545240f,
00229 0.550457972936604810f, 0.834862874986380010f,
00230 0.545324988422046460f, 0.838224705554837970f,
00231 0.540171472729892970f, 0.841554977436898330f,
00232 0.534997619887097260f, 0.844853565249707010f,
00233 0.529803624686294830f, 0.848120344803297120f,
00234 0.524589682678468840f, 0.851355193105265200f,
00235 0.519355990165589530f, 0.854557988365400530f,
00236 0.514102744193221660f, 0.857728610000272120f,
00237 0.508830142543106990f, 0.860866938637767310f,
00238 0.503538383725717580f, 0.863972856121586700f,
00239 0.498227666972781870f, 0.867046245515692650f,
00240 0.492898192229784090f, 0.870086991108711350f,
00241 0.487550160148436050f, 0.873094978418290090f,
00242 0.482183772079122830f, 0.876070094195406600f,
00243 0.476799230063322250f, 0.879012226428633410f,
00244 0.471396736825997810f, 0.881921264348354940f,
00245 0.465976495767966130f, 0.884797098430937790f,
00246 0.460538710958240010f, 0.887639620402853930f,
00247 0.455083587126343840f, 0.890448723244757880f,
00248 0.449611329654606600f, 0.893224301195515320f,
00249 0.444122144570429260f, 0.895966249756185110f,
00250 0.438616238538527710f, 0.898674465693953820f,
00251 0.433093818853152010f, 0.901348847046022030f,
00252 0.427555093430282200f, 0.903989293123443340f,
00253 0.422000270799799790f, 0.906595704514915330f,
00254 0.416429560097637320f, 0.909167983090522270f,
00255 0.410843171057903910f, 0.911706032005429880f,
00256 0.405241314004989860f, 0.914209755703530690f,
00257 0.399624199845646790f, 0.916679059921042700f,
00258 0.393992040061048100f, 0.919113851690057770f,
00259 0.388345046698826300f, 0.921514039342041900f,
00260 0.382683432365089840f, 0.923879532511286740f,
00261 0.377007410216418310f, 0.926210242138311270f,
00262 0.371317193951837600f, 0.928506080473215480f,
00263 0.365612997804773960f, 0.930766961078983710f,
00264 0.359895036534988280f, 0.932992798834738850f,
00265 0.354163525420490510f, 0.935183509938947500f,
00266 0.348418680249434510f, 0.937339011912574960f,
00267 0.342660717311994380f, 0.939459223602189920f,
00268 0.336889853392220050f, 0.941544065183020810f,
00269 0.331106305759876430f, 0.943593458161960390f,
00270 0.325310292162262980f, 0.945607325380521280f,
00271 0.319502030816015750f, 0.947585591017741090f,
00272 0.313681740398891570f, 0.949528180593036670f,
00273 0.307849640041534980f, 0.951435020969008340f,
00274 0.302005949319228200f, 0.953306040354193750f,
00275 0.296150888243623960f, 0.955141168305770670f,
00276 0.290284677254462330f, 0.956940335732208940f,
00277 0.284407537211271820f, 0.958703474895871600f,
00278 0.278519689385053060f, 0.960430519415565790f,
00279 0.272621355449948980f, 0.962121404269041580f,
00280 0.266712757474898420f, 0.963776065795439840f,
00281 0.260794117915275570f, 0.965394441697689400f,
00282 0.254865659604514630f, 0.966976471044852070f,
00283 0.248927605745720260f, 0.968522094274417270f,
00284 0.242980179903263980f, 0.970031253194543970f,
00285 0.237023605994367340f, 0.971503890986251780f,
00286 0.231058108280671280f, 0.972939952205560070f,
00287 0.225083911359792780f, 0.974339382785575860f,
00288 0.219101240156869770f, 0.975702130038528570f,
00289 0.213110319916091360f, 0.977028142657754390f,
00290 0.207111376192218560f, 0.978317370719627650f,
00291 0.201104634842091960f, 0.979569765685440520f,
00292 0.195090322016128330f, 0.980785280403230430f,
00293 0.189068664149806280f, 0.981963869109555240f,
00294 0.183039887955141060f, 0.983105487431216290f,
00295 0.177004220412148860f, 0.984210092386929030f,
00296 0.170961888760301360f, 0.985277642388941220f,
00297 0.164913120489970090f, 0.986308097244598670f,
00298 0.158858143333861390f, 0.987301418157858430f,
00299 0.152797185258443410f, 0.988257567730749460f,
00300 0.146730474455361750f, 0.989176509964781010f,
00301 0.140658239332849240f, 0.990058210262297120f,
00302 0.134580708507126220f, 0.990902635427780010f,
00303 0.128498110793793220f, 0.991709753669099530f,
00304 0.122410675199216280f, 0.992479534598709970f,
00305 0.116318630911904880f, 0.993211949234794500f,
00306 0.110222207293883180f, 0.993906970002356060f,
00307 0.104121633872054730f, 0.994564570734255420f,
00308 0.098017140329560770f, 0.995184726672196820f,
00309 0.091908956497132696f, 0.995767414467659820f,
00310 0.085797312344439880f, 0.996312612182778000f,
00311 0.079682437971430126f, 0.996820299291165670f,
00312 0.073564563599667454f, 0.997290456678690210f,
00313 0.067443919563664106f, 0.997723066644191640f,
00314 0.061320736302208648f, 0.998118112900149180f,
00315 0.055195244349690031f, 0.998475580573294770f,
00316 0.049067674327418126f, 0.998795456205172410f,
00317 0.042938256934940959f, 0.999077727752645360f,
00318 0.036807222941358991f, 0.999322384588349540f,
00319 0.030674803176636581f, 0.999529417501093140f,
00320 0.024541228522912264f, 0.999698818696204250f,
00321 0.018406729905804820f, 0.999830581795823400f,
00322 0.012271538285719944f, 0.999924701839144500f,
00323 0.006135884649154515f, 0.999981175282601110f,
00324 0.000000000000000061f, 1.000000000000000000f,
00325 -0.006135884649154393f, 0.999981175282601110f,
00326 -0.012271538285719823f, 0.999924701839144500f,
00327 -0.018406729905804695f, 0.999830581795823400f,
00328 -0.024541228522912142f, 0.999698818696204250f,
00329 -0.030674803176636459f, 0.999529417501093140f,
00330 -0.036807222941358866f, 0.999322384588349540f,
00331 -0.042938256934940834f, 0.999077727752645360f,
00332 -0.049067674327418008f, 0.998795456205172410f,
00333 -0.055195244349689913f, 0.998475580573294770f,
00334 -0.061320736302208530f, 0.998118112900149180f,
00335 -0.067443919563663982f, 0.997723066644191640f,
00336 -0.073564563599667329f, 0.997290456678690210f,
00337 -0.079682437971430015f, 0.996820299291165780f,
00338 -0.085797312344439755f, 0.996312612182778000f,
00339 -0.091908956497132571f, 0.995767414467659820f,
00340 -0.098017140329560645f, 0.995184726672196930f,
00341 -0.104121633872054600f, 0.994564570734255420f,
00342 -0.110222207293883060f, 0.993906970002356060f,
00343 -0.116318630911904750f, 0.993211949234794500f,
00344 -0.122410675199216150f, 0.992479534598709970f,
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00909 0.433093818853151790f, -0.901348847046022140f,
00910 0.438616238538527270f, -0.898674465693954040f,
00911 0.444122144570429420f, -0.895966249756185000f,
00912 0.449611329654606600f, -0.893224301195515320f,
00913 0.455083587126343610f, -0.890448723244757990f,
00914 0.460538710958239560f, -0.887639620402854160f,
00915 0.465976495767966290f, -0.884797098430937680f,
00916 0.471396736825997590f, -0.881921264348355050f,
00917 0.476799230063321870f, -0.879012226428633640f,
00918 0.482183772079122220f, -0.876070094195406930f,
00919 0.487550160148436000f, -0.873094978418290090f,
00920 0.492898192229783870f, -0.870086991108711460f,
00921 0.498227666972781480f, -0.867046245515692870f,
00922 0.503538383725717800f, -0.863972856121586590f,
00923 0.508830142543106990f, -0.860866938637767310f,
00924 0.514102744193221550f, -0.857728610000272230f,
00925 0.519355990165589200f, -0.854557988365400760f,
00926 0.524589682678469060f, -0.851355193105265080f,
00927 0.529803624686294610f, -0.848120344803297340f,
00928 0.534997619887096930f, -0.844853565249707230f,
00929 0.540171472729892410f, -0.841554977436898780f,
00930 0.545324988422046460f, -0.838224705554837970f,
00931 0.550457972936604700f, -0.834862874986380120f,
00932 0.555570233019601840f, -0.831469612302545460f,
00933 0.560661576197336250f, -0.828045045257755690f,
00934 0.565731810783613120f, -0.824589302785025290f,
00935 0.570780745886967030f, -0.821102514991104870f,
00936 0.575808191417844890f, -0.817584813151584040f,
00937 0.580813958095764640f, -0.814036329705948300f,
00938 0.585797857456438750f, -0.810457198252594880f,
00939 0.590759701858873940f, -0.806847553543799450f,
00940 0.595699304492432910f, -0.803207531480645280f,
00941 0.600616479383868970f, -0.799537269107905010f,
00942 0.605511041404325320f, -0.795836904608883680f,
00943 0.610382806276309140f, -0.792106577300212610f,
00944 0.615231590580627040f, -0.788346427626606120f,
00945 0.620057211763289100f, -0.784556597155575240f,
00946 0.624859488142386120f, -0.780737228572094600f,
00947 0.629638238914926650f, -0.776888465673232780f,
00948 0.634393284163645600f, -0.773010453362736880f,
00949 0.639124444863775620f, -0.769103337645579700f,
00950 0.643831542889791160f, -0.765167265622459180f,
00951 0.648514401022112000f, -0.761202385484262220f,
00952 0.653172842953776760f, -0.757208846506484570f,
00953 0.657806693297078530f, -0.753186799043612630f,
00954 0.662415777590171450f, -0.749136394523459590f,
00955 0.666999922303637690f, -0.745057785441465840f,
00956 0.671558954847018330f, -0.740951125354959110f,
00957 0.676092703575315700f, -0.736816568877370020f,
00958 0.680600997795452690f, -0.732654271672413150f,
00959 0.685083667772700470f, -0.728464390448225090f,
00960 0.689540544737066830f, -0.724247082951467000f,
00961 0.693971460889653780f, -0.720002507961381880f,
00962 0.698376249408972360f, -0.715730825283819040f,
00963 0.702754744457225300f, -0.711432195745216430f,
00964 0.707106781186547350f, -0.707106781186547680f,
00965 0.711432195745216100f, -0.702754744457225630f,
00966 0.715730825283818820f, -0.698376249408972690f,
00967 0.720002507961381540f, -0.693971460889654000f,
00968 0.724247082951466670f, -0.689540544737067160f,
00969 0.728464390448224860f, -0.685083667772700800f,
00970 0.732654271672412930f, -0.680600997795453020f,
00971 0.736816568877369790f, -0.676092703575316030f,
00972 0.740951125354958880f, -0.671558954847018660f,
00973 0.745057785441465500f, -0.666999922303638030f,
00974 0.749136394523459370f, -0.662415777590171780f,
00975 0.753186799043612300f, -0.657806693297078860f,
00976 0.757208846506484230f, -0.653172842953777090f,
00977 0.761202385484261890f, -0.648514401022112330f,
00978 0.765167265622458850f, -0.643831542889791500f,
00979 0.769103337645579480f, -0.639124444863775950f,
00980 0.773010453362736660f, -0.634393284163645930f,
00981 0.776888465673232550f, -0.629638238914926980f,
00982 0.780737228572094380f, -0.624859488142386450f,
00983 0.784556597155575020f, -0.620057211763289540f,
00984 0.788346427626605890f, -0.615231590580627370f,
00985 0.792106577300212390f, -0.610382806276309480f,
00986 0.795836904608883340f, -0.605511041404325660f,
00987 0.799537269107904790f, -0.600616479383869310f,
00988 0.803207531480645050f, -0.595699304492433250f,
00989 0.806847553543799220f, -0.590759701858874280f,
00990 0.810457198252594660f, -0.585797857456439090f,
00991 0.814036329705948080f, -0.580813958095764970f,
00992 0.817584813151583710f, -0.575808191417845230f,
00993 0.821102514991104540f, -0.570780745886967370f,
00994 0.824589302785025070f, -0.565731810783613560f,
00995 0.828045045257755350f, -0.560661576197336590f,
00996 0.831469612302545240f, -0.555570233019602180f,
00997 0.834862874986379900f, -0.550457972936605030f,
00998 0.838224705554837750f, -0.545324988422046800f,
00999 0.841554977436898440f, -0.540171472729892740f,
01000 0.844853565249707010f, -0.534997619887097260f,
01001 0.848120344803297120f, -0.529803624686294940f,
01002 0.851355193105264860f, -0.524589682678469390f,
01003 0.854557988365400530f, -0.519355990165589530f,
01004 0.857728610000272010f, -0.514102744193221880f,
01005 0.860866938637767090f, -0.508830142543107430f,
01006 0.863972856121586360f, -0.503538383725718130f,
01007 0.867046245515692650f, -0.498227666972781870f,
01008 0.870086991108711350f, -0.492898192229784260f,
01009 0.873094978418289870f, -0.487550160148436380f,
01010 0.876070094195406710f, -0.482183772079122610f,
01011 0.879012226428633410f, -0.476799230063322200f,
01012 0.881921264348354830f, -0.471396736825997920f,
01013 0.884797098430937460f, -0.465976495767966680f,
01014 0.887639620402853930f, -0.460538710958239950f,
01015 0.890448723244757770f, -0.455083587126344000f,
01016 0.893224301195515100f, -0.449611329654606980f,
01017 0.895966249756184880f, -0.444122144570429810f,
01018 0.898674465693953820f, -0.438616238538527660f,
01019 0.901348847046021920f, -0.433093818853152180f,
01020 0.903989293123443120f, -0.427555093430282530f,
01021 0.906595704514915450f, -0.422000270799799570f,
01022 0.909167983090522380f, -0.416429560097637260f,
01023 0.911706032005429660f, -0.410843171057904240f,
01024 0.914209755703530470f, -0.405241314004990420f,
01025 0.916679059921042700f, -0.399624199845646790f,
01026 0.919113851690057660f, -0.393992040061048270f,
01027 0.921514039342041790f, -0.388345046698826690f,
01028 0.923879532511286520f, -0.382683432365090390f,
01029 0.926210242138311380f, -0.377007410216418260f,
01030 0.928506080473215480f, -0.371317193951837820f,
01031 0.930766961078983490f, -0.365612997804774350f,
01032 0.932992798834738960f, -0.359895036534988000f,
01033 0.935183509938947500f, -0.354163525420490510f,
01034 0.937339011912574850f, -0.348418680249434900f,
01035 0.939459223602189700f, -0.342660717311994930f,
01036 0.941544065183020810f, -0.336889853392220000f,
01037 0.943593458161960270f, -0.331106305759876600f,
01038 0.945607325380521170f, -0.325310292162263370f,
01039 0.947585591017741200f, -0.319502030816015470f,
01040 0.949528180593036670f, -0.313681740398891520f,
01041 0.951435020969008340f, -0.307849640041535140f,
01042 0.953306040354193640f, -0.302005949319228580f,
01043 0.955141168305770780f, -0.296150888243623730f,
01044 0.956940335732208820f, -0.290284677254462500f,
01045 0.958703474895871490f, -0.284407537211272210f,
01046 0.960430519415565680f, -0.278519689385053670f,
01047 0.962121404269041580f, -0.272621355449948980f,
01048 0.963776065795439840f, -0.266712757474898590f,
01049 0.965394441697689290f, -0.260794117915275960f,
01050 0.966976471044852180f, -0.254865659604514410f,
01051 0.968522094274417270f, -0.248927605745720200f,
01052 0.970031253194543970f, -0.242980179903264180f,
01053 0.971503890986251670f, -0.237023605994367730f,
01054 0.972939952205560180f, -0.231058108280671000f,
01055 0.974339382785575860f, -0.225083911359792970f,
01056 0.975702130038528460f, -0.219101240156870160f,
01057 0.977028142657754170f, -0.213110319916091970f,
01058 0.978317370719627650f, -0.207111376192218530f,
01059 0.979569765685440520f, -0.201104634842092120f,
01060 0.980785280403230320f, -0.195090322016128720f,
01061 0.981963869109555350f, -0.189068664149806030f,
01062 0.983105487431216290f, -0.183039887955141010f,
01063 0.984210092386929030f, -0.177004220412149050f,
01064 0.985277642388941110f, -0.170961888760301770f,
01065 0.986308097244598670f, -0.164913120489969810f,
01066 0.987301418157858320f, -0.158858143333861580f,
01067 0.988257567730749460f, -0.152797185258443800f,
01068 0.989176509964780900f, -0.146730474455362390f,
01069 0.990058210262297120f, -0.140658239332849210f,
01070 0.990902635427780010f, -0.134580708507126420f,
01071 0.991709753669099410f, -0.128498110793793640f,
01072 0.992479534598709970f, -0.122410675199216030f,
01073 0.993211949234794500f, -0.116318630911904840f,
01074 0.993906970002356060f, -0.110222207293883360f,
01075 0.994564570734255420f, -0.104121633872055130f,
01076 0.995184726672196930f, -0.098017140329560506f,
01077 0.995767414467659820f, -0.091908956497132877f,
01078 0.996312612182778000f, -0.085797312344440282f,
01079 0.996820299291165670f, -0.079682437971430750f,
01080 0.997290456678690210f, -0.073564563599667412f,
01081 0.997723066644191640f, -0.067443919563664287f,
01082 0.998118112900149180f, -0.061320736302209057f,
01083 0.998475580573294770f, -0.055195244349689775f,
01084 0.998795456205172410f, -0.049067674327418091f,
01085 0.999077727752645360f, -0.042938256934941139f,
01086 0.999322384588349430f, -0.036807222941359394f,
01087 0.999529417501093140f, -0.030674803176636543f,
01088 0.999698818696204250f, -0.024541228522912448f,
01089 0.999830581795823400f, -0.018406729905805226f,
01090 0.999924701839144500f, -0.012271538285720572f,
01091 0.999981175282601110f, -0.006135884649154477f
01092 };
01093
01115 arm_status arm_cfft_radix4_init_f32(
01116 arm_cfft_radix4_instance_f32 * S,
01117 uint16_t fftLen,
01118 uint8_t ifftFlag,
01119 uint8_t bitReverseFlag)
01120 {
01121 /* Initialise the default arm status */
01122 arm_status status = ARM_MATH_SUCCESS;
01123
01124 /* Initialise the FFT length */
01125 S->fftLen = fftLen;
01126
01127 /* Initialise the Twiddle coefficient pointer */
01128 S->pTwiddle = (float32_t *) twiddleCoef;
01129
01130 /* Initialise the Flag for selection of CFFT or CIFFT */
01131 S->ifftFlag = ifftFlag;
01132
01133 /* Initialise the Flag for calculation Bit reversal or not */
01134 S->bitReverseFlag = bitReverseFlag;
01135
01136 /* Initializations of structure parameters depending on the FFT length */
01137 switch (S->fftLen)
01138 {
01139
01140 case 1024u:
01141 /* Initializations of structure parameters for 1024 point FFT */
01142
01143 /* Initialise the twiddle coef modifier value */
01144 S->twidCoefModifier = 1u;
01145 /* Initialise the bit reversal table modifier */
01146 S->bitRevFactor = 1u;
01147 /* Initialise the bit reversal table pointer */
01148 S->pBitRevTable = armBitRevTable;
01149 /* Initialise the 1/fftLen Value */
01150 S->onebyfftLen = 0.0009765625f;
01151 break;
01152
01153
01154 case 256u:
01155 /* Initializations of structure parameters for 256 point FFT */
01156 S->twidCoefModifier = 4u;
01157 S->bitRevFactor = 4u;
01158 S->pBitRevTable = &armBitRevTable[3];
01159 S->onebyfftLen = 0.00390625f;
01160 break;
01161
01162 case 64u:
01163 /* Initializations of structure parameters for 64 point FFT */
01164 S->twidCoefModifier = 16u;
01165 S->bitRevFactor = 16u;
01166 S->pBitRevTable = &armBitRevTable[15];
01167 S->onebyfftLen = 0.015625f;
01168 break;
01169
01170 case 16u:
01171 /* Initializations of structure parameters for 16 point FFT */
01172 S->twidCoefModifier = 64u;
01173 S->bitRevFactor = 64u;
01174 S->pBitRevTable = &armBitRevTable[63];
01175 S->onebyfftLen = 0.0625f;
01176 break;
01177
01178
01179 default:
01180 /* Reporting argument error if fftSize is not valid value */
01181 status = ARM_MATH_ARGUMENT_ERROR;
01182 break;
01183 }
01184
01185 return (status);
01186 }
01187
All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Defines
Generated on Mon Nov 29 2010 17:19:55 for CMSIS DSP Software Library by
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