1 /* ----------------------------------------------------------------------
2 * Copyright (C) 2010 ARM Limited. All rights reserved.
7 * Project: CMSIS DSP Library
8 * Title: arm_rfft_init_f32.c
10 * Description: RFFT & RIFFT Floating point initialisation function
12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
14 * Version 1.0.10 2011/7/15
15 * Big Endian support added and Merged M0 and M3/M4 Source code.
17 * Version 1.0.3 2010/11/29
18 * Re-organized the CMSIS folders and updated documentation.
20 * Version 1.0.2 2010/11/11
21 * Documentation updated.
23 * Version 1.0.1 2010/10/05
24 * Production release and review comments incorporated.
26 * Version 1.0.0 2010/09/20
27 * Production release and review comments incorporated.
29 * Version 0.0.7 2010/06/10
30 * Misra-C changes done
31 * -------------------------------------------------------------------- */
37 * @ingroup groupTransforms
41 * @addtogroup RFFT_RIFFT
47 * Generation of realCoefA array:
50 * <pre>for (i = 0; i < n; i++)
52 * pATable[2 * i] = 0.5 * (1.0 - sin (2 * PI / (double) (2 * n) * (double) i));
53 * pATable[2 * i + 1] = 0.5 * (-1.0 * cos (2 * PI / (double) (2 * n) * (double) i));
59 static const float32_t realCoefA[2048] = {
60 0.500000000000000000f, -0.500000000000000000f, 0.498466014862060550f,
61 -0.499997645616531370f, 0.496932059526443480f, -0.499990582466125490f,
62 0.495398133993148800f, -0.499978810548782350f,
63 0.493864238262176510f, -0.499962359666824340f, 0.492330402135849000f,
64 -0.499941170215606690f, 0.490796625614166260f, -0.499915301799774170f,
65 0.489262968301773070f, -0.499884694814682010f,
66 0.487729400396347050f, -0.499849408864974980f, 0.486195921897888180f,
67 -0.499809414148330690f, 0.484662592411041260f, -0.499764710664749150f,
68 0.483129411935806270f, -0.499715298414230350f,
69 0.481596380472183230f, -0.499661177396774290f, 0.480063527822494510f,
70 -0.499602377414703370f, 0.478530883789062500f, -0.499538868665695190f,
71 0.476998418569564820f, -0.499470651149749760f,
72 0.475466161966323850f, -0.499397724866867070f, 0.473934143781661990f,
73 -0.499320119619369510f, 0.472402364015579220f, -0.499237775802612300f,
74 0.470870882272720340f, -0.499150782823562620f,
75 0.469339638948440550f, -0.499059051275253300f, 0.467808693647384640f,
76 -0.498962640762329100f, 0.466278046369552610f, -0.498861521482467650f,
77 0.464747726917266850f, -0.498755723237991330f,
78 0.463217705488204960f, -0.498645216226577760f, 0.461688071489334110f,
79 -0.498530030250549320f, 0.460158795118331910f, -0.498410135507583620f,
80 0.458629876375198360f, -0.498285561800003050f,
81 0.457101345062255860f, -0.498156309127807620f, 0.455573230981826780f,
82 -0.498022347688674930f, 0.454045534133911130f, -0.497883707284927370f,
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84 0.450991421937942500f, -0.497592359781265260f, 0.449465066194534300f,
85 -0.497439652681350710f, 0.447939187288284300f, -0.497282296419143680f,
86 0.446413785219192500f, -0.497120231389999390f,
87 0.444888889789581300f, -0.496953487396240230f, 0.443364530801773070f,
88 -0.496782064437866210f, 0.441840678453445430f, -0.496605962514877320f,
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91 -0.496049642562866210f, 0.435750931501388550f, -0.495854884386062620f,
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93 0.432709634304046630f, -0.495451331138610840f, 0.431189924478530880f,
94 -0.495242536067962650f, 0.429670870304107670f, -0.495029091835021970f,
95 0.428152471780776980f, -0.494810998439788820f,
96 0.426634758710861210f, -0.494588255882263180f, 0.425117731094360350f,
97 -0.494360834360122680f, 0.423601418733596800f, -0.494128793478012080f,
98 0.422085791826248170f, -0.493892073631286620f,
99 0.420570939779281620f, -0.493650704622268680f, 0.419056802988052370f,
100 -0.493404686450958250f, 0.417543441057205200f, -0.493154048919677730f,
101 0.416030853986740110f, -0.492898762226104740f,
102 0.414519041776657100f, -0.492638826370239260f, 0.413008064031600950f,
103 -0.492374241352081300f, 0.411497890949249270f, -0.492105036973953250f,
104 0.409988552331924440f, -0.491831213235855100f,
105 0.408480048179626460f, -0.491552740335464480f, 0.406972438097000120f,
106 -0.491269648075103760f, 0.405465662479400630f, -0.490981936454772950f,
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108 0.402454853057861330f, -0.490392625331878660f, 0.400950789451599120f,
109 -0.490091055631637570f, 0.399447679519653320f, -0.489784896373748780f,
110 0.397945523262023930f, -0.489474087953567500f,
111 0.396444320678710940f, -0.489158689975738530f, 0.394944071769714360f,
112 -0.488838672637939450f, 0.393444836139678960f, -0.488514065742492680f,
113 0.391946613788604740f, -0.488184869289398190f,
114 0.390449374914169310f, -0.487851053476333620f, 0.388953179121017460f,
115 -0.487512677907943730f, 0.387458056211471560f, -0.487169682979583740f,
116 0.385963946580886840f, -0.486822128295898440f,
117 0.384470939636230470f, -0.486469984054565430f, 0.382979035377502440f,
118 -0.486113250255584720f, 0.381488204002380370f, -0.485751956701278690f,
119 0.379998475313186650f, -0.485386073589324950f,
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121 -0.484640628099441530f, 0.375536203384399410f, -0.484261035919189450f,
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123 0.372567176818847660f, -0.483488231897354130f, 0.371084451675415040f,
124 -0.483094990253448490f, 0.369602948427200320f, -0.482697218656539920f,
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126 0.366643607616424560f, -0.481888025999069210f, 0.365165829658508300f,
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130 -0.479785770177841190f, 0.357796221971511840f, -0.479351729154586790f,
131 0.356326282024383540f, -0.478913217782974240f,
132 0.354857653379440310f, -0.478470176458358760f, 0.353390425443649290f,
133 -0.478022634983062740f, 0.351924568414688110f, -0.477570593357086180f,
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136 -0.476187497377395630f, 0.346075177192687990f, -0.475717514753341670f,
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138 0.343159139156341550f, -0.474764078855514530f, 0.341703325510025020f,
139 -0.474280685186386110f, 0.340248972177505490f, -0.473792791366577150f,
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142 -0.472302407026290890f, 0.334446847438812260f, -0.471796721220016480f,
143 0.333000183105468750f, -0.471286594867706300f,
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145 -0.470253020524978640f, 0.328669637441635130f, -0.469729602336883540f,
146 0.327229350805282590f, -0.469201773405075070f,
147 0.325790673494338990f, -0.468669503927230830f, 0.324353635311126710f,
148 -0.468132823705673220f, 0.322918236255645750f, -0.467591762542724610f,
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161 0.298782676458358760f, -0.457724362611770630f,
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748 0.473300457000732420f, 0.340248972177505490f, 0.473792791366577150f,
749 0.341703325510025020f, 0.474280685186386110f,
750 0.343159139156341550f, 0.474764078855514530f, 0.344616413116455080f,
751 0.475243031978607180f, 0.346075177192687990f, 0.475717514753341670f,
752 0.347535371780395510f, 0.476187497377395630f,
753 0.348997026681900020f, 0.476653009653091430f, 0.350460082292556760f,
754 0.477114051580429080f, 0.351924568414688110f, 0.477570593357086180f,
755 0.353390425443649290f, 0.478022634983062740f,
756 0.354857653379440310f, 0.478470176458358760f, 0.356326282024383540f,
757 0.478913217782974240f, 0.357796221971511840f, 0.479351729154586790f,
758 0.359267532825469970f, 0.479785770177841190f,
759 0.360740154981613160f, 0.480215251445770260f, 0.362214088439941410f,
760 0.480640232563018800f, 0.363689333200454710f, 0.481060713529586790f,
761 0.365165829658508300f, 0.481476634740829470f,
762 0.366643607616424560f, 0.481888025999069210f, 0.368122667074203490f,
763 0.482294887304306030f, 0.369602948427200320f, 0.482697218656539920f,
764 0.371084451675415040f, 0.483094990253448490f,
765 0.372567176818847660f, 0.483488231897354130f, 0.374051094055175780f,
766 0.483876913785934450f, 0.375536203384399410f, 0.484261035919189450f,
767 0.377022475004196170f, 0.484640628099441530f,
768 0.378509908914566040f, 0.485015630722045900f, 0.379998475313186650f,
769 0.485386073589324950f, 0.381488204002380370f, 0.485751956701278690f,
770 0.382979035377502440f, 0.486113250255584720f,
771 0.384470939636230470f, 0.486469984054565430f, 0.385963946580886840f,
772 0.486822128295898440f, 0.387458056211471560f, 0.487169682979583740f,
773 0.388953179121017460f, 0.487512677907943730f,
774 0.390449374914169310f, 0.487851053476333620f, 0.391946613788604740f,
775 0.488184869289398190f, 0.393444836139678960f, 0.488514065742492680f,
776 0.394944071769714360f, 0.488838672637939450f,
777 0.396444320678710940f, 0.489158689975738530f, 0.397945523262023930f,
778 0.489474087953567500f, 0.399447679519653320f, 0.489784896373748780f,
779 0.400950789451599120f, 0.490091055631637570f,
780 0.402454853057861330f, 0.490392625331878660f, 0.403959810733795170f,
781 0.490689605474472050f, 0.405465662479400630f, 0.490981936454772950f,
782 0.406972438097000120f, 0.491269648075103760f,
783 0.408480048179626460f, 0.491552740335464480f, 0.409988552331924440f,
784 0.491831213235855100f, 0.411497890949249270f, 0.492105036973953250f,
785 0.413008064031600950f, 0.492374241352081300f,
786 0.414519041776657100f, 0.492638826370239260f, 0.416030853986740110f,
787 0.492898762226104740f, 0.417543441057205200f, 0.493154048919677730f,
788 0.419056802988052370f, 0.493404686450958250f,
789 0.420570939779281620f, 0.493650704622268680f, 0.422085791826248170f,
790 0.493892073631286620f, 0.423601418733596800f, 0.494128793478012080f,
791 0.425117731094360350f, 0.494360834360122680f,
792 0.426634758710861210f, 0.494588255882263180f, 0.428152471780776980f,
793 0.494810998439788820f, 0.429670870304107670f, 0.495029091835021970f,
794 0.431189924478530880f, 0.495242536067962650f,
795 0.432709634304046630f, 0.495451331138610840f, 0.434229999780654910f,
796 0.495655417442321780f, 0.435750931501388550f, 0.495854884386062620f,
797 0.437272518873214720f, 0.496049642562866210f,
798 0.438794672489166260f, 0.496239781379699710f, 0.440317392349243160f,
799 0.496425211429595950f, 0.441840678453445430f, 0.496605962514877320f,
800 0.443364530801773070f, 0.496782064437866210f,
801 0.444888889789581300f, 0.496953487396240230f, 0.446413785219192500f,
802 0.497120231389999390f, 0.447939187288284300f, 0.497282296419143680f,
803 0.449465066194534300f, 0.497439652681350710f,
804 0.450991421937942500f, 0.497592359781265260f, 0.452518254518508910f,
805 0.497740387916564940f, 0.454045534133911130f, 0.497883707284927370f,
806 0.455573230981826780f, 0.498022347688674930f,
807 0.457101345062255860f, 0.498156309127807620f, 0.458629876375198360f,
808 0.498285561800003050f, 0.460158795118331910f, 0.498410135507583620f,
809 0.461688071489334110f, 0.498530030250549320f,
810 0.463217705488204960f, 0.498645216226577760f, 0.464747726917266850f,
811 0.498755723237991330f, 0.466278046369552610f, 0.498861521482467650f,
812 0.467808693647384640f, 0.498962640762329100f,
813 0.469339638948440550f, 0.499059051275253300f, 0.470870882272720340f,
814 0.499150782823562620f, 0.472402364015579220f, 0.499237775802612300f,
815 0.473934143781661990f, 0.499320119619369510f,
816 0.475466161966323850f, 0.499397724866867070f, 0.476998418569564820f,
817 0.499470651149749760f, 0.478530883789062500f, 0.499538868665695190f,
818 0.480063527822494510f, 0.499602377414703370f,
819 0.481596380472183230f, 0.499661177396774290f, 0.483129411935806270f,
820 0.499715298414230350f, 0.484662592411041260f, 0.499764710664749150f,
821 0.486195921897888180f, 0.499809414148330690f,
822 0.487729400396347050f, 0.499849408864974980f, 0.489262968301773070f,
823 0.499884694814682010f, 0.490796625614166260f, 0.499915301799774170f,
824 0.492330402135849000f, 0.499941170215606690f,
825 0.493864238262176510f, 0.499962359666824340f, 0.495398133993148800f,
826 0.499978810548782350f, 0.496932059526443480f, 0.499990582466125490f,
827 0.498466014862060550f, 0.499997645616531370f
833 * Generation of realCoefB array:
836 * <pre>for (i = 0; i < n; i++)
838 * pBTable[2 * i] = 0.5 * (1.0 + sin (2 * PI / (double) (2 * n) * (double) i));
839 * pBTable[2 * i + 1] = 0.5 * (1.0 * cos (2 * PI / (double) (2 * n) * (double) i));
843 static const float32_t realCoefB[2048] = {
844 0.500000000000000000f, 0.500000000000000000f, 0.501533985137939450f,
845 0.499997645616531370f, 0.503067970275878910f, 0.499990582466125490f,
846 0.504601895809173580f, 0.499978810548782350f,
847 0.506135761737823490f, 0.499962359666824340f, 0.507669627666473390f,
848 0.499941170215606690f, 0.509203374385833740f, 0.499915301799774170f,
849 0.510737061500549320f, 0.499884694814682010f,
850 0.512270629405975340f, 0.499849408864974980f, 0.513804078102111820f,
851 0.499809414148330690f, 0.515337407588958740f, 0.499764710664749150f,
852 0.516870558261871340f, 0.499715298414230350f,
853 0.518403589725494380f, 0.499661177396774290f, 0.519936442375183110f,
854 0.499602377414703370f, 0.521469116210937500f, 0.499538868665695190f,
855 0.523001611232757570f, 0.499470651149749760f,
856 0.524533808231353760f, 0.499397724866867070f, 0.526065826416015630f,
857 0.499320119619369510f, 0.527597606182098390f, 0.499237775802612300f,
858 0.529129147529602050f, 0.499150782823562620f,
859 0.530660390853881840f, 0.499059051275253300f, 0.532191336154937740f,
860 0.498962640762329100f, 0.533721983432769780f, 0.498861521482467650f,
861 0.535252273082733150f, 0.498755723237991330f,
862 0.536782264709472660f, 0.498645216226577760f, 0.538311958312988280f,
863 0.498530030250549320f, 0.539841234683990480f, 0.498410135507583620f,
864 0.541370153427124020f, 0.498285561800003050f,
865 0.542898654937744140f, 0.498156309127807620f, 0.544426798820495610f,
866 0.498022347688674930f, 0.545954465866088870f, 0.497883707284927370f,
867 0.547481775283813480f, 0.497740387916564940f,
868 0.549008548259735110f, 0.497592359781265260f, 0.550534904003143310f,
869 0.497439652681350710f, 0.552060842514038090f, 0.497282296419143680f,
870 0.553586184978485110f, 0.497120231389999390f,
871 0.555111110210418700f, 0.496953487396240230f, 0.556635499000549320f,
872 0.496782064437866210f, 0.558159291744232180f, 0.496605962514877320f,
873 0.559682607650756840f, 0.496425211429595950f,
874 0.561205327510833740f, 0.496239781379699710f, 0.562727510929107670f,
875 0.496049642562866210f, 0.564249038696289060f, 0.495854884386062620f,
876 0.565770030021667480f, 0.495655417442321780f,
877 0.567290365695953370f, 0.495451331138610840f, 0.568810045719146730f,
878 0.495242536067962650f, 0.570329129695892330f, 0.495029091835021970f,
879 0.571847498416900630f, 0.494810998439788820f,
880 0.573365211486816410f, 0.494588255882263180f, 0.574882268905639650f,
881 0.494360834360122680f, 0.576398611068725590f, 0.494128793478012080f,
882 0.577914178371429440f, 0.493892073631286620f,
883 0.579429090023040770f, 0.493650704622268680f, 0.580943167209625240f,
884 0.493404686450958250f, 0.582456588745117190f, 0.493154048919677730f,
885 0.583969175815582280f, 0.492898762226104740f,
886 0.585480928421020510f, 0.492638826370239260f, 0.586991965770721440f,
887 0.492374241352081300f, 0.588502109050750730f, 0.492105036973953250f,
888 0.590011477470397950f, 0.491831213235855100f,
889 0.591519951820373540f, 0.491552740335464480f, 0.593027591705322270f,
890 0.491269648075103760f, 0.594534337520599370f, 0.490981936454772950f,
891 0.596040189266204830f, 0.490689605474472050f,
892 0.597545146942138670f, 0.490392625331878660f, 0.599049210548400880f,
893 0.490091055631637570f, 0.600552320480346680f, 0.489784896373748780f,
894 0.602054476737976070f, 0.489474087953567500f,
895 0.603555679321289060f, 0.489158689975738530f, 0.605055928230285640f,
896 0.488838672637939450f, 0.606555163860321040f, 0.488514065742492680f,
897 0.608053386211395260f, 0.488184869289398190f,
898 0.609550595283508300f, 0.487851053476333620f, 0.611046791076660160f,
899 0.487512677907943730f, 0.612541973590850830f, 0.487169682979583740f,
900 0.614036023616790770f, 0.486822128295898440f,
901 0.615529060363769530f, 0.486469984054565430f, 0.617020964622497560f,
902 0.486113250255584720f, 0.618511795997619630f, 0.485751956701278690f,
903 0.620001494884490970f, 0.485386073589324950f,
904 0.621490061283111570f, 0.485015630722045900f, 0.622977554798126220f,
905 0.484640628099441530f, 0.624463796615600590f, 0.484261035919189450f,
906 0.625948905944824220f, 0.483876913785934450f,
907 0.627432823181152340f, 0.483488231897354130f, 0.628915548324584960f,
908 0.483094990253448490f, 0.630397081375122070f, 0.482697218656539920f,
909 0.631877362728118900f, 0.482294887304306030f,
910 0.633356392383575440f, 0.481888025999069210f, 0.634834170341491700f,
911 0.481476634740829470f, 0.636310696601867680f, 0.481060713529586790f,
912 0.637785911560058590f, 0.480640232563018800f,
913 0.639259815216064450f, 0.480215251445770260f, 0.640732467174530030f,
914 0.479785770177841190f, 0.642203748226165770f, 0.479351729154586790f,
915 0.643673717975616460f, 0.478913217782974240f,
916 0.645142316818237300f, 0.478470176458358760f, 0.646609604358673100f,
917 0.478022634983062740f, 0.648075461387634280f, 0.477570593357086180f,
918 0.649539887905120850f, 0.477114051580429080f,
919 0.651003003120422360f, 0.476653009653091430f, 0.652464628219604490f,
920 0.476187497377395630f, 0.653924822807312010f, 0.475717514753341670f,
921 0.655383586883544920f, 0.475243031978607180f,
922 0.656840860843658450f, 0.474764078855514530f, 0.658296704292297360f,
923 0.474280685186386110f, 0.659750998020172120f, 0.473792791366577150f,
924 0.661203861236572270f, 0.473300457000732420f,
925 0.662655174732208250f, 0.472803652286529540f, 0.664104938507080080f,
926 0.472302407026290890f, 0.665553152561187740f, 0.471796721220016480f,
927 0.666999816894531250f, 0.471286594867706300f,
928 0.668444931507110600f, 0.470772027969360350f, 0.669888436794281010f,
929 0.470253020524978640f, 0.671330332756042480f, 0.469729602336883540f,
930 0.672770678997039790f, 0.469201773405075070f,
931 0.674209356307983400f, 0.468669503927230830f, 0.675646364688873290f,
932 0.468132823705673220f, 0.677081763744354250f, 0.467591762542724610f,
933 0.678515493869781490f, 0.467046260833740230f,
934 0.679947495460510250f, 0.466496407985687260f, 0.681377887725830080f,
935 0.465942144393920900f, 0.682806491851806640f, 0.465383470058441160f,
936 0.684233427047729490f, 0.464820444583892820f,
937 0.685658574104309080f, 0.464253038167953490f, 0.687082052230834960f,
938 0.463681250810623170f, 0.688503682613372800f, 0.463105112314224240f,
939 0.689923584461212160f, 0.462524622678756710f,
940 0.691341698169708250f, 0.461939752101898190f, 0.692758023738861080f,
941 0.461350560188293460f, 0.694172501564025880f, 0.460757017135620120f,
942 0.695585191249847410f, 0.460159152746200560f,
943 0.696996033191680910f, 0.459556937217712400f, 0.698404967784881590f,
944 0.458950400352478030f, 0.699812114238739010f, 0.458339542150497440f,
945 0.701217353343963620f, 0.457724362611770630f,
946 0.702620685100555420f, 0.457104891538620000f, 0.704022109508514400f,
947 0.456481099128723140f, 0.705421566963195800f, 0.455853015184402470f,
948 0.706819176673889160f, 0.455220639705657960f,
949 0.708214759826660160f, 0.454584002494812010f, 0.709608435630798340f,
950 0.453943043947219850f, 0.711000144481658940f, 0.453297853469848630f,
951 0.712389826774597170f, 0.452648371458053590f,
952 0.713777542114257810f, 0.451994657516479490f, 0.715163230895996090f,
953 0.451336652040481570f, 0.716546893119812010f, 0.450674414634704590f,
954 0.717928528785705570f, 0.450007945299148560f,
955 0.719308137893676760f, 0.449337244033813480f, 0.720685660839080810f,
956 0.448662281036376950f, 0.722061097621917720f, 0.447983115911483760f,
957 0.723434448242187500f, 0.447299748659133910f,
958 0.724805653095245360f, 0.446612149477005000f, 0.726174771785736080f,
959 0.445920348167419430f, 0.727541804313659670f, 0.445224374532699580f,
960 0.728906631469726560f, 0.444524168968200680f,
961 0.730269372463226320f, 0.443819820880889890f, 0.731629908084869380f,
962 0.443111270666122440f, 0.732988238334655760f, 0.442398548126220700f,
963 0.734344422817230220f, 0.441681683063507080f,
964 0.735698342323303220f, 0.440960645675659180f, 0.737050116062164310f,
965 0.440235435962677000f, 0.738399624824523930f, 0.439506113529205320f,
966 0.739746868610382080f, 0.438772648572921750f,
967 0.741091907024383540f, 0.438035041093826290f, 0.742434620857238770f,
968 0.437293320894241330f, 0.743775069713592530f, 0.436547487974166870f,
969 0.745113253593444820f, 0.435797542333602910f,
970 0.746449112892150880f, 0.435043483972549440f, 0.747782647609710690f,
971 0.434285342693328860f, 0.749113857746124270f, 0.433523118495941160f,
972 0.750442683696746830f, 0.432756811380386350f,
973 0.751769185066223140f, 0.431986421346664430f, 0.753093302249908450f,
974 0.431211978197097780f, 0.754415094852447510f, 0.430433481931686400f,
975 0.755734443664550780f, 0.429650902748107910f,
976 0.757051348686218260f, 0.428864300251007080f, 0.758365929126739500f,
977 0.428073674440383910f, 0.759678006172180180f, 0.427278995513916020f,
978 0.760987639427185060f, 0.426480293273925780f,
979 0.762294828891754150f, 0.425677597522735600f, 0.763599574565887450f,
980 0.424870878458023070f, 0.764901816844940190f, 0.424060165882110600f,
981 0.766201555728912350f, 0.423245459794998170f,
982 0.767498791217803960f, 0.422426789999008180f, 0.768793523311614990f,
983 0.421604126691818240f, 0.770085752010345460f, 0.420777499675750730f,
984 0.771375417709350590f, 0.419946908950805660f,
985 0.772662520408630370f, 0.419112354516983030f, 0.773947000503540040f,
986 0.418273866176605220f, 0.775228977203369140f, 0.417431443929672240f,
987 0.776508331298828130f, 0.416585087776184080f,
988 0.777785122394561770f, 0.415734797716140750f, 0.779059290885925290f,
989 0.414880603551864620f, 0.780330777168273930f, 0.414022535085678100f,
990 0.781599700450897220f, 0.413160532712936400f,
991 0.782865881919860840f, 0.412294656038284300f, 0.784129500389099120f,
992 0.411424905061721800f, 0.785390377044677730f, 0.410551249980926510f,
993 0.786648571491241460f, 0.409673750400543210f,
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1617 * @brief Initialization function for the floating-point RFFT/RIFFT.
1618 * @param[in,out] *S points to an instance of the floating-point RFFT/RIFFT structure.
1619 * @param[in,out] *S_CFFT points to an instance of the floating-point CFFT/CIFFT structure.
1620 * @param[in] fftLenReal length of the FFT.
1621 * @param[in] ifftFlagR flag that selects forward (ifftFlagR=0) or inverse (ifftFlagR=1) transform.
1622 * @param[in] bitReverseFlag flag that enables (bitReverseFlag=1) or disables (bitReverseFlag=0) bit reversal of output.
1623 * @return The function returns ARM_MATH_SUCCESS if initialization is successful or ARM_MATH_ARGUMENT_ERROR if <code>fftLenReal</code> is not a supported value.
1627 * The parameter <code>fftLenReal</code> Specifies length of RFFT/RIFFT Process. Supported FFT Lengths are 128, 512, 2048.
1629 * The parameter <code>ifftFlagR</code> controls whether a forward or inverse transform is computed.
1630 * Set(=1) ifftFlagR to calculate RIFFT, otherwise RFFT is calculated.
1632 * The parameter <code>bitReverseFlag</code> controls whether output is in normal order or bit reversed order.
1633 * Set(=1) bitReverseFlag for output to be in normal order otherwise output is in bit reversed order.
1635 * This function also initializes Twiddle factor table.
1638 arm_status arm_rfft_init_f32(
1639 arm_rfft_instance_f32 * S,
1640 arm_cfft_radix4_instance_f32 * S_CFFT,
1641 uint32_t fftLenReal,
1643 uint32_t bitReverseFlag)
1646 /* Initialise the default arm status */
1647 arm_status status = ARM_MATH_SUCCESS;
1649 /* Initialize the Real FFT length */
1650 S->fftLenReal = (uint16_t) fftLenReal;
1652 /* Initialize the Complex FFT length */
1653 S->fftLenBy2 = (uint16_t) fftLenReal / 2u;
1655 /* Initialize the Twiddle coefficientA pointer */
1656 S->pTwiddleAReal = (float32_t *) realCoefA;
1658 /* Initialize the Twiddle coefficientB pointer */
1659 S->pTwiddleBReal = (float32_t *) realCoefB;
1661 /* Initialize the Flag for selection of RFFT or RIFFT */
1662 S->ifftFlagR = (uint8_t) ifftFlagR;
1664 /* Initialize the Flag for calculation Bit reversal or not */
1665 S->bitReverseFlagR = (uint8_t) bitReverseFlag;
1667 /* Initializations of structure parameters depending on the FFT length */
1668 switch (S->fftLenReal)
1670 /* Init table modifier value */
1672 S->twidCoefRModifier = 1u;
1675 S->twidCoefRModifier = 4u;
1678 S->twidCoefRModifier = 16u;
1681 /* Reporting argument error if rfftSize is not valid value */
1682 status = ARM_MATH_ARGUMENT_ERROR;
1686 /* Init Complex FFT Instance */
1691 /* Initializes the CIFFT Module for fftLenreal/2 length */
1692 arm_cfft_radix4_init_f32(S->pCfft, S->fftLenBy2, 1u, 0u);
1696 /* Initializes the CFFT Module for fftLenreal/2 length */
1697 arm_cfft_radix4_init_f32(S->pCfft, S->fftLenBy2, 0u, 0u);
1700 /* return the status of RFFT Init function */
1706 * @} end of RFFT_RIFFT group