CMSIS DSP Software Library: arm_cfft_radix4_init_f32.c Source File Main Page Modules Data Structures Files Examples File List Globals 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, 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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  1.7.2