From 522e1e2ee3b201703d90d7322ba576dcaf1450de Mon Sep 17 00:00:00 2001
From: Edward Emelianov <edward.emelianoff@gmail.com>
Date: Fri, 13 Feb 2026 20:55:37 +0300
Subject: [PATCH] some USB fixes

---
 F1:F103/BISS_C_encoders/encoders.bin          | Bin 15524 -> 15760 bytes
 F1:F103/BISS_C_encoders/encoders.creator.user |   2 +-
 F1:F103/BISS_C_encoders/flash.c               |   4 +-
 F1:F103/BISS_C_encoders/main.c                |  10 +++-
 F1:F103/BISS_C_encoders/spi.c                 |   1 +
 F1:F103/BISS_C_encoders/usb_dev.c             |  43 ++++++++++++------
 F1:F103/BISS_C_encoders/usb_dev.h             |   2 +-
 F1:F103/BISS_C_encoders/version.inc           |   4 +-
 F3:F303/InterfaceBoard/flash.c                |   3 +-
 F3:F303/InterfaceBoard/usb_dev.c              |  20 +++++---
 F3:F303/USB_template/Readme                   |   1 +
 F3:F303/USB_template_CDC/Readme               |   1 +
 snippets/usb_pl2303/Readme                    |   2 +
 13 files changed, 66 insertions(+), 27 deletions(-)
 create mode 100644 F3:F303/USB_template/Readme
 create mode 100644 F3:F303/USB_template_CDC/Readme

diff --git a/F1:F103/BISS_C_encoders/encoders.bin b/F1:F103/BISS_C_encoders/encoders.bin
index 758d54cbe7df9c062b8c927a4f9fb04b7f2cdeb0..efe98a1fe7def3c7b2cf625b52dd241f53a33222 100755
GIT binary patch
delta 7728
zcmbtZdt6gT_Mdxi2sa_}^ubHHNmK$s4Pe#!C@~~gUIJ>}YVH1n*6pITijP`a-6jaS
z*mmpVs`b6DTG!pGAgo>8YC*Bxs?;X+QG8Y0R$`6q-asT{faG^33AWwe{`ceaIr-k1
zIdf*_oHJ+63<uuWuu_JK5%*LoVjpds9CIx398HfK*YGd;6N=zI$umrN@zaPMHx9A$
zfQrWnKZbT?pNU5-Dn)vP5a+d{#_}ns(bzTQ#Uc6S#~W~4Wd4wy^@1VgdO~5t;sz(J
z;I1I9sLS_SYys28IDHeVO@oAFS#lPAQ=UVMFLjrnE)sp2oxd$V9a_NVpL3!YX-B0h
zTDHHNR?~$IzrAQjZeJ1^4aQ`L=WZIx9{0JA3mawmw6a_HMwUj)y9I^(oUyTU&U$)2
z!xOAONvZthQu1s4p5`_fK5Cp@W{F=HUnC-$)W-YUPBiLc%csB`bYvxhRsKKJuY^%y
z$!3G+p`BFY(<8nYCl4)rDs~GlS4N-Qf|sX<ojiSCth|FQ7UZxn5?=b~)DqTdLC~h8
z9L*GRRG~j2pL>T7X^I|H)ApMKZ6}P-8r6!cb=wW>Ekj4dl51E@r!wC$d<J;!HpL-z
zdR!$gr$`xTxa_X=OETkVr^P@&I$@~7%c&V<ar#P^e%iDWGCXSBOo3JeTbOA;jhCz_
z7l&8~j>?aZ+k{<$R<VR~3A+`==G?r6b3LnjqD2Kg)us?56w`2;PCTx5S+dolo>4e`
zx?S}NlBW8nuBxYMV+EKgN_pC*aJ)-}I4Y@Q_yt{ar%Zb7SQ4L@2Wt+`f0cGzqNPqM
zT#{MzU{UzuPFW~Do^iYv{wMrGc_x-5N-~$3RG3b}wvKwUzH9xm5aSw9PgtH>Z-BvJ
z1^Tbshl+KQYM1`m$v90<YKGX$r%=i&Tpk7MRW{nu3rJ5^sbCNXW+;;KRdp=ikEccH
z<JgmkW9p#S`aAfXg>^_}+p#MhX*;bWi$>;29c!6TM^z~8sA7;=Xh0Ia6{Ed(@PRr?
z2y5GCIMk@(Q}}Vb&pp+PG@9E(<3o(eR^ZX?cgUHBM{k;kw*~}WwB~jFRXvWs2yH%h
zf8ci9L_06zCXN~(9gk95Z^h(OJ7SENG1ejN?Hf9f`LXx9z17xXAAqTea_tzYmE!(l
zN9sCb4a{-Bo!TkQ>+9h3ci8X!!A@3sig-F99nuRG;RnZF!qq&|9JeakV)6y(oNx?r
z(YZdi#wX8<nXeWpCZ?3)%1<kvw1z=zoG>#Y**r^!*fJoZy5R*?b!xDzEBy~RG;(J{
zD6h^3ONLy*$Z`i)Z(tm2LiRgP$%`IX!rJ2~m4@%<45fVTU-wd)B&)h?zk~H_CAxJh
z$k=&|=;S<T1ZnQu<c=^Vu==|<h(>Sr-iF0aOfgmiYrsakai~tN#Wps7PEb)De%8-=
ze}pI^aFJv3T<I~eHlKTwcaoCeyFQdgHfzkyHJDM2vFX&x+%=fa*aAWWoWJuTPOkL1
zU-wDC6~xn2@=FH7E9{LNO=SyLBh~##_#%4U3Lf;n5E7M?+ok;LNs41nM}xv1DN!o6
z0)pSTz(zhd2j=~^Rjwr8u|5QR0`7v=dsZ51qM)@6TFJLecr|MB<i4r2_Y$=b<0OIl
z@AS?*Mvs;_Od<U-orpMkw9kFn`+>o2llzzUg;&Di(=1Pkt-`;fa?O3STplpiWOZTs
zu&odVMkn3DH5OG-!m-IbQOU;M6hFS>-RvLjX@6;L??6mNP#Tq$)(o<i9}A4}hBtjg
zh>h@N3`5#)Y<KMvj>HX8gR~E={a~K+d+*z!Y=(;OtnyqkL`m-*QUx_Pt)c#!=X$T%
zw}A>PU~)Mbh+PF(17rb;JRVa(xXHq!K;Y!wbpHY;cmtCd>m`bm<31i1ct-VR_<2%-
zJj1-1H0O0=Fk<9sVyg{)!AVa94~9+yf`TK0ox+6qG0Hfi{Rn8qJpqv&y#a^#QP>}o
zLhsTEmts^@oZyUkZfu{Sw)X_QOXx-FwV263X|I82<>amf&mtxac-GpU!2B%@=Kd5l
z>~AomJ}){2-=70r0cry}1XKs~zVN|-DP#5zf-j(D0|WFieAoW0OzPkHkFt4?pc*)Q
zSl`&&yMr_AkvMgrj`Q_C_aB1uStq<YaPTOJs<d-5U4<nolyV8&*6ZHhODWIWhk;9z
zHWX}Yvce(len&Vtu+%JxKGUhE*4aY{Pc$V`R26JI5^DOK4<BFoMCEUQQWLt7s$yz2
z>?dsv((1*}EjsmUxz(U2V$Fb_WZiw1Er%X-w_`C<A#GE~=N8friH(-6{DQ()isFUs
zgGNR5^}6l}X!o*keNa-0EB&)h{XpVD(?G^2p1|r)bW8oK_qiLo1KhQOGIo&J&n+d~
z2H@Tk<lgp#TL^Nm@7{tJmXO&=Mas`V7Wmf&`7PauBl3Ojl|la33BL~bmCc=&{_!9`
z4fq!Y`OCTkw(!Z_F9kcy70$%YG}9R~Ax)sd=NQO>$Jo>Psi0QkD-XdZh<Zun=^_3B
z_(e-gOJq7?V}Upz4G=y)Vk!w~WJy{WvR_a+p)jF9Z8Fr-p5X-nHFSH16&-jKwnEh=
zbu^nH?hcJgIrdXb{PA(1TOc&pA3qCc@z2}8c}&Ex5Rkt1K-<LTW6xrCBGR_r=o>B^
zhP(KG`kj3|9{Ty*r##<4Ai<{ti%ihL3U&d_8;{r)z;i(4xY?4wRTveo9`;`0R?Mo-
zc216=v@cm{t-*@4nO3A)m;Zc8inQO=>fDcTp746SQu$Uvnm)TLYgt8}T3_YT&xk3B
z@t^L?b5`UwFFXcZC*#!vPFSc^Bp$LLZKL&!Jz9F|>L>P>1!ufcOE38|exU?XkA;%V
zDuWW!uVC9o`$t#-+gi4?xpNBBI;5$-Tk{c?3zHJ!LY^N#d`N*XCt*^CD+;A%x#rdW
z#(v6)BJ|>2%Qgh5UwWo-uIJsJD(pHlHlHyzV;o8NifgCYh4RE9$!R&1<M*MAF%#1f
zld&Z1q~Wn`Xnr%6G!ZskZMr=)<x`tV_<N#qbV6;S9ci;%gKA+i8B(p;HK11dh%WcK
zXZ1$dCo}|VA6Z!~67R#}%r3fCNE;mgtR!zniL0IDL5+<*AMq<xg7oX*oA{O#%FtC6
z0y;Tuk)@hlw~kUuIGR(kJ2-ifs1Mu2!+KR;e2<<zh;vkP^B`%h6jlvh3diHW2gjKw
z<nPDJISL}-L*4J%8AzD!;P2WRQRLWb7;V^w!X2UV^s+xWWRxsra4ShJZ(tNj5T$h3
zYIsUXz6&9vAb2Kr9b(f9F=bg|JcA|vWE9%`cn5E2BQk#>(ft1siISbMm3aA*=5|<P
z#zCBykqBSKI_E-48_#PRDF{VbuKq_q!Z{gXB@yj`a7Qw$+5O=70{xjux<%Yo!r#Fy
zl~r|KcY&96NEiW^!wIMtkNf8?aa4!g!F7N75XqeuDdUU`?TDi`b<Bp`UPjg}h1?0H
zzHFoXmyV8Uq;3YJIW=vU@w?ns(+q3u?aR12a*3$`(1OC9zD(qx6bdukh!`W)_L50&
z-O0ybDoLJ#ZB0%J%`y&XTgJ;A5=ssUxD7f{6KEswj;Gpo7_`=1zu+!0B8~E<A#tr~
zpCg=>-iCgR+)*XJ0oRRqqa`)xmWH2{>vgyGAT^oXHbbX>lIDK5Es&DtX9SWolse&7
zfFaPV;l1uTy=F~oBjSFzy)77y(m)XQAH!aEhmYDx1jd(<Ur45G6i2>9zj!i@orukJ
z#&#6vm5};?ZpgjrQ@cf_G4rt??7benp#c)c8apVO8c?_nMWz$gE{pwdqRWd(ZJ+3l
z;!NZ7e$htbQh!S|T+=QEV=&nxZ4h^@5S56%iK#<|3}~FKo~14l=`f+3lccOD*iuIe
z63Agmc1*19t9&U=z&RX(ZFR$fl#7e1a8BeRVK-MqwFp0O>F}GRG?{TF<fn2gzZpw1
znmhFj63BUjw3Do8=l%w`<CRMsYbbS@4ZBoD57x+c##b3oho|xcgc&6MW3>(P7Ao@$
z{Qi9Or&q^`RD{;{KAcC}rQ@$?_yHsk7J1#W6DU=0qcUslC{^A_3EwIQn7P$5INyHi
zkHnEd`Kgs?Bog1NEK6*v_qsRwb1<^HMU@)9*L~AR<nNT~okJ?g+|*_Jj2EyX(?8bw
z;N=ojwhKbcHWTW2Xn7wm;C2|AM7w2$snNBl)|vfTry(a=;#f_8g<DjVm_%LBM~f7#
z7cW#+B`TaO6=z&x%Icb3OX4aL2d%zYAIA^m6%K}->#2FX_yHB3Ba=8R$ckHpT9q2q
zdRdiXZrR6*No=Zz#fu-vWQ!lLEaJkQG!^b-!_U{x^}Oeu>sj|0BzVwPkiiy$jJ48h
zxaCFCk4o30;U2cDEA)JQQ~j()y-1-YrUy0!yhbF7J{IjkVl6S8f^jIQOW9{S4N(&R
z9&3q~ib+zZQeX67`Vf*KO-JvU6i!M(i_g%pjjKh5K4<#QhV}?Y)y6@8KZ?|F=4TKk
zH(N3xfV8d#5@bV_=Ixeq_~DDhEf~0<Az^nrj3;}m9YJ`nS*_;}g4h4KC*UkdtcIHX
zP_w7!i5W+lUDu8V43zcgUq{hSawL3kG+>-raK-BK_m=V>Hf(`}ZlP|jRCg6=vRoZU
zK&siFOl$y=ul2y?W4qVAxR(q@QjB+@c0mssNy<$f1*=J24b+wR1(MPlD9wISs)Ew=
z9^x^td7JN{k!JUqBW^pH+VfKLqdy$&llvy{J<}87Ob354p9hB<(@PQ!uREjn&Gx=^
z&Go#~P3|(YAh2k9X7O^R*RAS(wf(RBA->GM64J~pm*l9b><Sj6r^oLw_*}h5()la+
zA?<ZXd(>s;u$a+#Pp2lQ7)eBP?SbW?C(C;trqONg4wyy)H~Gu3yO8z`$nj_VB6sz=
z??1_13!&59U-Xe=lAUq@GG5bv^!mb|{(0U1gixx2JwtZi1=!ygV4MqBlKI2ErHMJj
z+5>q?x8xpa2Bo>2M}B9I6WIu&E+pnvf}*!&z_16qL$}guN{NQ|b8?DAOpTa+k{MZH
zMJY&3s}%IZhbHMe23M|(eJ-O4bISZgYD`zXWMruoDOc2gZ4b*;2wx5#{Az{Wz%OjS
zS^qM>jrZO|jeW`HUbwFv0wRI%76d_Zf9nrKg5prX!$2fK)c{TeG6MA(%Lc0<k%)0p
z44mefS*|HZmfYKvyNQfQ7utpAHHnap#~dRr5)o93tOvSC_2OAeoJd11b;Z)>AS;2Z
z$MX+=Bxrn6y8>#R{*2e_c04i2QmAeB1Z>;pzYclbx4PfQWqV0~-pcHxw!mxR(@0p8
zJk9KiIt&jHN^srKzj)mTJe;bZGg0xCJ@ms}CTh3LDp!;CzIhOyO`g7z2}XLyUm`&{
z%k}jUM)aZV26Er_y5I7*Xd4hW5%^yB^r?pU>9r%ou7?kgGq>xw$B>9{)a=BSvAUq0
z?zR&X>!8~U9^wSQ4c@A6*nSdXcD;R=2zmQ3*-zVGKkYia`MbWUsi5yOLDh`wP7n6a
za!sr)<`bb!=NaR#Gm}jl2Njwiv#L8O$ZU44I?^}X1v}x31it=3zVL3JyZYlkSK(me
zmV@~%K-++J0TI`!0V)8h0D1wa4cv&$k>zbLFki8`@BlVmeCP?yVf__I2^FHpgG4zd
zK1UMPo(X}=vqk~Qt9r!umK-5xO<f%}GMj{drX=_KBhz*D_jxg8dzkF2YlZHVnW4L>
zuB%A7NO&%Fg!zsaHq(+K7g}0UP&#%0e2U9<S!QI5gPHxM-_9>`Sr$M!``gkv`9-2A
zn_aS?q}Q$Op}AfNFrmpsVjCRvC>;0(f((vQeu^XaPJ=W!r*isK_&xLM(i*JZ(2Qf-
zl1k5FO9>GAcK#ha`dGFLG2fa?Td+P7HGb@*!n$oB=4GHrCfS&0D$wVi#risl^CEK=
z7uOwd&J8(>3+m2dW8J`cY)N}ue@u;n16ypVJZNArwJOBPg)mMP(_tHtJ2pRWfdS6S
zycel9$n30n3pR&(u9`Y#PA}+c(d%+)HCrMt(RYOW%aC7^CYZGY&EtwhovcW7$PFE=
zVrX7$PE^SnnCQGVlNb`Rru5VKT!HBU8}ezXY5ssBlSqY_O1}XkBouP4sd~L@ll~Hv
z;&S@upTjli3M^AEZbIh(e~+Vt1CMfy|AeQ&gP7fW5G$HgZRA-1MbdiMh4AuD>4n&|
zF=nntFMWI!Gzt^3gaehpWh41;-jUpWklPFE4j1gK&lWl6!>Jz@3YGhC|2DRCYzcWi
z41?E0k6F_Q?~QfD!;$uB8@W$5KPE3kO>k>nsEZLfHo<n5e+3SLZ><nr9Wr`{;hW23
z(}!4LgPJ2)D+t(d)m{t-(gF|Jvt5vK_PXbJI_zpVHxw~j@GIOLI6LNEhiO7ua|K7n
zkn%KAW^Hg{_}p7C(#*ZN0A9x)rSHZvuAfsT-(eVIg_}IvxBXVZPKm+Lhasmtsb!sJ
z9Sz5hifkkjxFi^H92{X@EP>Zil0A~(F{hzV#G>3@$dCia;KL_8C!BP|+Ypc}*3Iy=
z7!OVYsVKX{kmahVZL*WacpsCAtb(cbx-t2dlSOT}Z#MfC_oa0<2>#4>(Z9>dWPSzZ
zPl5xTz?-4IAY*z?!pSvlk(kPw(7<Uu*O>}VThmDMlGeA{qM?@47F?gCeQaa+NS>~^
zaBNa)2}~%EBxHlUtv>P)<8^NcCXQcPpUE|o8NKbhV5ch>9;M#1Ath1j4xZX5X=9xf
zd&0>@+_FBEKaHP(#~~yx07ZA$GV-bIjN@}Si#6$xwu#%O(3<mB38X9fT5Ue#PXKdb
zP|6<v1d#TkZM&VCaI-#1Th~eq5XDoNnlPgxL1-8mW!`6x<rz$;!BeRC3}$$3J5o`E
zLu;r|oqXRO<==LKl}mkm{V#T!udy@y0gy-YH|xK&BP01o66OE50*O%MI*2j@r(h(Y
z0;q|EIXD$D33<W)fq^2mAbA4SU>fx%6)}1=r{^+s8DmE1GDf6l3YT<a!is)nn$FKG
zC{Q9KFzH`KEnS+%E&a{1<)urPb2Ex_In?k~`U<HTLp*E)+DqahP#VO@LZEUWxipeO
zG^M9tYRktW_IxC~w*orj5L*rSK@?)&4dQ0N0ns2Qh=+rC0`Te}c!~j>Dustiz<v=h
zCSWd&%<O&mSSLg5L%<(s#JYmm6GRE@{M#T{0k|#(5(dD#faJx>1n-yR^@<>Q^?aj$
z;02T*2YjSn6GZYlO6ti=DM9jT`bK{<yc!1ukf&7Apo0#_<%lKEtfWky#fTsu{3Q~b
zfHu+q`vDpO!vSXj5-lwRlmo5;i~_6yj0D^a7y-B!kjOa)m;mJ~X81^i4;Ns6z}V4<
zjR7nGj0T(sNdDot3NRF~4sZZq3t%ju3y|bfnx_yO4_FKs2e=$i0=Nw@1h5HE3V0uI
z2w>zG#L56)d=@^)j4A-3jA{VG01p7tfPVvI0NVfu0xG~Pg8+vD4hEbENczL4|E~nf
z^MHuAE(BbaAsih4fI1{>oDeff6NWfTkg*RA{kJ*^Yy~p<&;AYxcPGSvoJSLC{}%^g
BiVFY$

delta 7446
zcmZu$33wAnvhJCYrI9RrVvrB;$O3%GfMl~A0b(KK!57E`c!7{z>_B$S^<j?9gU4ni
z9~?=@a!eoulWamrU;`K*Ktcl8#4K@mWFv6|69+JP!2-l)M_8anwxq3=WH$TW^Y^v>
z>F%oP>gww1>h`wv``5`)DdMU!5&LNSl=#M!b2MEtuK7p$3`KCC<XI+a(Rjp`j6>{N
zD2v7kKg%9Z%}hcpDn|x{5a)NGmda_U#q@aSOR2?`$D46iO!3gVCc&6>J!MAoie?wB
zR9``y`ElU)i6u-I;|ffw%~uKO^7I5*=jpqZ21Nla_I_>_1GzoFt31sL<?@8Y3m_GF
z0;yyK7>6BExMLW5Jm6^--jo;9C%wY=@@#saS6~(AgqX<RP%*-a$aG8JlLrovqr;~w
zk0;Iem1-xhRL7m%iPz|vla;3>{GbAfvzC!QI<*qo)ReQ0Le3f#@Vp;D8Rq-7^n*@9
zJN5C_l{H3H3#BoO2&q~&;7UF1vKn&}=|`U#Yw#LsRz;$r%59iAv#jzoYI%!7oE7vO
zDNIpLNoe)A^vvH{h$E~7M;9k0?!cn(wsIvU3i1J^mg4!#7%`feJG8Zl&M4}rLgI1C
zWt|cA=(8C&v4l%=Ta9U=fqttgPLgv~Gd)YS1FtDR^9AFqVIrJ0bQ6BD@~a-X^ly!n
z6Dd;)XDz3k7b&TWQc7~o_m?SG^vGrO1je~Vxeq9Fu_RlPyD(pk>CxE!xXJL?vUPQY
zX#<GV82*MOy3=<>!#}!*i4Brkw_!H47)T4}sGLTPsK%A$2!7X;x02O(5gEu#l?=@E
zo@kEXYZ_Sob)FW#!>W^rV;X>S>n*&uA<`Ma2w2o3ZI4aDYl<VB8>An)PRSYPMro%7
zqsl|*7XE`(?%W`!gieffz(98<(^{?rOa*KmwxY+MXwvw0=$pyw_<-kmKQolQ@l(<s
zQ@1?{Q<D_hC>zE7)p5&y9b+BRc7C4$ROkKI97t0QGCp;%#nhg7)8%0Ay<qRB{yUDh
zs3^ppB0i-Hd9R?1{&<|~NiB~uj@y)7@x?^(<VM8B6$U($0*a#e#Tt=f;>#(n^0e}4
zZzS}N6z)Z*YqyL>>|Q9uB*RN;8Z;^*;Y}=y5t?OuS}}53Bd%a%y@jp9#F)ggO+G4P
zs7+Jxp_653ZCuALpss5q^ZgoTi!$!n70yT|r1y{CkB3=_zMC+sNv2w$3>o=dEYm5p
z*e)xcAD-dEAZ4fTXNT}v%-AAP9}iOqcn<m}s|o%ofU?1t>G;kKIG`SD*J;#+8?ax$
z6GVn61wY~x>VRimKmsc%o~F_l8VRj1K6VVXRahRY89-tHaey7*0D|ytY--^{^(QAO
zjy)X*c5$gu7PbMx`nh3k0-mvcl<^OnLQTGt0tn~?{1AHY*l1`;hu$veCEt-kMBJ1q
z{i^i&h)u{Eq=J<n`Q|jzV<gV}h=G_+K^#3M;JNDm$mp>vf>Zm}FX8ZMmZ!us!lt;w
zynZbYhSp??W`=(FF8n}0CiNEHY)vyKH%{S+Ne=ijgZQTZt>9=Ag0;OubbNwky<a~v
z!cN+Ah9m7w`)!AW1Lv+HElB&oHURXp`0hGF^`C5tLL%`M->q;<r%e`YS?>GJu^TLQ
z7<8%BBentX6qI97Vvfg`ghobOEXaG_rw`6&vS0C=;Ku|%G2DOPej*l#@_jkMKCM4A
z`E)-qp9#W7%xSVT=YoP$p9&rVJle3}*f7rkff}ezB*u=0-l(udw=cB*qA+n_CT$xn
z{B~d(^|J8Vz~{&HuglTCkTdP{A<ae{(4*|%gCi9bZUjdnD;9F3y?r6os+$KVP}K0d
zpi#fmi16J9h1DT;Ae0~A`zI)ZFnQ3lv5|uj8yJMx&V*3WKz%Tj{yM>)U-Xl@W03Iq
zpb?h-v5)qKHSCkPbYPCJn*yG#VSV1{lW^ltk1nP}iW2ZLuDmBdt_JX$BOAOIrIq(g
zp=$t9=HI}3{hm8MO8vECc(@OR`&w;q;CZe=-xrRQep$kT!LuwV?re{Ndd(3*IO51C
zH6&<4sOk4ee0=@Wg;@ut*Y~2dwbN^1lW8|2twC(J>NLMEtOaY5B@bCMwYPuyD}h7R
z>s$dEYFi(+TL~W$TdceIB{P<qlLWnLbZkG@KfIwexGJnvrGj<N_ZS9|{WKF~T=9l%
z^m(r|XrqAVcyEZhu@|XRz@0jMNIeknnr|mwRz}7LektKM0{^iv|DLD(JH!0jd;967
zA{C?`2lRW3!VJ~Dh$BM=Jg<fs))59B44`i7u?|dv0kVOiHcY>yH?)WW&&y%@a$#QL
z9E)E+2hMmZYQB+}V5~#WPX|L2ALGEMh`~vK(!sX?_|3(O7ftY80%bOo7op(eBd3$d
zN2a8O5jA0R$w8k`YdW;5ydz3NhVglaoA*D8d?l?*>TDB6Cdr>VoWvXA2n7${li663
zlG*sLsOo+~B(M;&u6v<xQd{F}%ua#>?)(0cqF|)k|A(*R$uqzg@SO49gwTV-ImRN;
z-3DcC+ys~?#1lCAg6B?CakKDMl4kg!8N09~?aQ7i@sxI<jn*1%NSkXzX&)EAP?jkj
zaP@=26POpGlhx|Fl5E4&$9b!F7HJGMZo{njviRWfy}dvvY+Kd{R5Oz`2}7!=EF|_>
zk+#Kl))6N?b@hy+MtCh*T}Z7wfL|<w>|&WDx5fzB#ZqkF?l^(joLx9#Ra?(ArUUYu
z-i#Ai`sJ?cw3v!0NU$!&y=mw2n9-V!TX$vRkvB&ST`cq@Pqv7$C@ass=;+HNc^fyc
zz@=K?-Qusp;%!LJsIwSXzJpG=P_)zbtqQi3%c_hS_Z^(6N~cV&t9akZB6-G;4w7zN
z#|RNb84v9nd5R<7C0G`0Ygbtjt1H2%tIX7jC0*gZt`-Xr-NNox5ZMJHSt2qDL>>!@
z?D&PqNE4+Fv&9gsLu_sdX3#>@+_G?ca40ezU%kKk1TJlLEj#5(h|Xv+iwR1li;{iS
zGeg$qY-7xg>H^BSNyeCj%_+(RRdE}Zv=YV}^*6g^nHKk|qY1)+6gBr%eS0_3=DFMI
z!L~V4t;Kz|Uiyft^m|HuUv#4uA!Udvh2%6+*aK~iA)=pbto9GE{1*3n^+I1t(%8vG
zv&y!0LuXn<R+&wnWpQt+r__*lWKMm^Da@iF@;x3_EA5+mX!gh0l$KL;3%6T^B|}zG
zgM=GH5-kIYKg4S|3PS$_T?Widn)5N{b2Ma*I@dBvo5W|dP!OE*+{yJPuqh|9Y*05U
z3uRd(+xojQ<g60@7VfL6Y4Cfh{j5_0nIasG5dJP$i3Qi0AwyT1?{87cT-FGsD@J-K
zkrEEgGh6Q0$_W9|R@f;G`8qU{{K}k4$d)$0e;IG#cI3~tscu}xwK1>fPyhZhwjzZq
zkc*sDRFo_5EMua&R_9N#)$#F|N>yZHd#j5=b4>|dvv|2vLdl#}lpT1eiL?o5pP{<;
z7_)8fg{dte@=6oRNb5AFROjz=Dro5qU}R*Fn!}*FB$G8O!l^{R{-LnY@6o|ANfg{|
z3@JL`hSjtgPs<6Va44(vhfsg0H!MeX4U`W~ZXWqX+C}}7)dy#L4R6t1!<#w5_-PA}
zqPnE&q&gK!BgCHsDc*sL3*s)?sXAdBH*o5~U?Y)EeD$8{erZwAQ$xh$u5{F4O-lrQ
z?R^I0dyr_Za=;2ugQmZRV)Sq)k}nmuatY5=l#(I(<=ijTnqCOXF`1SGdurjP^)1=H
zx%J^_Od|0QBvt%@Q)R9y+1Wq~63A>r7XyQcsuv~-xPU_tVJ=ybda1bv7sM<PhN#U{
zyRclXhu=S|^DRGCLE@^g@o!<2)7E2PkU&l(q@8R-bsshxA4XS7oEs=jg&m7&=KC8I
zbxAcw^zf&u&mdkP(Nb;4IETuG7?ShL(KXeHA{DK*zYPb_9%;^%3_gLxKeOLc_!-I?
zZ>MsPI#8CPg%TE~C0G>IayZfc#gD|%VforBGzy7pt141jo4|ya$g7hYT<KLr7fr=J
z(*?}t24!yz9a6+Bdtswa&2JSSS>MJ>U@g%@(fUe$i~E(MuBqpHjByfYHGK)Ur%_@m
zb-@rfUZiM)c&e%<Md@OxMAORryvOB7NkBy6pz6-1M1ByjbTaG$@8%~f?o&|(a*5N5
zY`9&>(`dkq3pJUR_I<3F%4T_4yy8B~uDCCk1GV=Xj2aMkncu@lxo9fN#YTPIw7~l(
z{{ru8L=syJl8A4&=MZj6Z$KI^+tVrgx~a8kZi_*r(8~P#b|u{KQ^Wu}i~pX#K_rUx
zWYLt2Q%Mnh&h{8{V<o}e)gBimrbel~Q7-fS=aNa5^c;F4AHt%N7N4b6E!84JpUeNz
zPQ(b=!%Txu)FTa?^Lk?D!`57g9S^FZ2%CnfE!Ea@`0h)@F&Ma_Az^Pfj4FQ>f+Z69
zY6E`=yt<(;<Ss}wLdyYYIneiXAxBx<SL;JdmiOp-J*p$|a({hjx#q&v>sF9k${%Xp
z18Lnd-3wCPRg{tEb{zq!mS6(06GZ;85AG%J_&tk!WH6FeY=hR-eP|S^w?53SCT&}w
zZE;W_sl5)hm!8%(L2Z6t2JiD6^M82<jk0)Jk9c4shW5(>?;E}3-ZGc>dkXsI@(Q)z
zGs<UK-~9=HkheJ2L;9HKPO49<xPl+VJ(sk{7;wke>-j7AF75X$@oFm0;RiYLZk^^9
zK2=2$%rZwvVdYbW7lQ)HeIZ**oC;WToP)IMAi;m>-%?V)hwWF|!u=YUsDEQZxg?Zt
zfJ}Dw|6==lFp2YfE(3iU><hA^F2J6>00UjXD3|G8l|q(p5Krkg-66eT1-GpJRY#)8
zMh6#B++hXF?VbXop6`|I5-yF1W04qLg)&#$ga;#rrM`T9z3Ta#8qBGSQ>d|zn<U^g
zPaw9u(sa#{T$mz^PEQ@#Z&N#rNn!xwqL{Pro#(DTa`;YX({K6ReBh3euk2<E<-jq-
zvK#_he=6AyS(gn8*~Jn-a;uvJg#@}1K$3cv0xp8G42q6>qN>6iH7{koN*C5_w}Z^0
z7G^P~m&}u-h<=Z%->lppp(h=ZW#Ul-`X<YQ-SR%6EMpO5N{8W<Kn?yQ`wQGryj<D<
zSBmnILw0CyKJ~8LrqGc7elH|6m%aV9=RoeoV2#AaJa=?GBL)!CuC$RGu^*Dnpp~`D
z;f_-Pv?sj%wj%DOtcUf8aNj=se7De%o)S!fp8=}f!Q>hCKrdKRI>w$T($Vq3yEF0f
z9H7|b{T#+Cv4y1Pxu+i;1-E0rXT5h?@V-pwvVd-NSkk=S{(H2=edfqh9l#sjK1??2
zJ5tM|4=jh@`Kf<mDZo4@%sjF8O!yMM!~T?2+hrrpwD$1NcgSF|KtDN5ujvhVKKvr2
zTD`55kA%L_-oH2+VDVa^oP$CZoP&_P8}J~MS}3#Dzz+-MeS!t@qHRXz5?dITgv2hd
ztbh&Hk($(h_99UMNhIRPB_(EJ=t4Y936D^kk@u_xI|?>5G+-06U09!$KA?_ye05_{
ze8r!csaH1$N3-V0-lHC0Me5~3q;{lbLIC#2O0yfSS}?tA#-YU&H`Q&OHB}tK94dD%
zHoL7$p+41F{z9=?6y@{ER+afY8~SL@=c(>P>1MGDo-}1qK$ikCI7)pU$262ere~^}
zIRkz__)Ym{tl9SG@-`gP^(D5pLP5^OB_&hch;f!*uwX+BYN00e*+Inbpv0I(hMiiJ
zKRvH-;GziEe=`GL{>ZgJdS%h<MS~ZyWf4wRmVl|zD9a$WRh>36nA#$BaZ<*W#yqr-
zDjZ*2w8RLfThU8Y7o=Ubq9r?J-mCc!=R8;P_@Y5yNNd<KMVaB@kH+G%k;Si<SwdtN
zDo~c!4!NruW--Am>L7o0vc`vO<nW@zg4nW+i*MnIE?$g~ZY)2)SUsJ;FPEM#=b?3O
zD-T}Em*0f-NHKHn=>~&)2Rwu#lvt2Z{8zjgU4<DN#2x6bfLn0vhaWvE$iIluwgZ^8
z9*|>YgQg3$l#CO;%r;pvHXEc*u9_ignMJD-%5OoZj01%S3qAmj*I$Fj(54+tMv<dG
zn*Oo*^{Nl>z*cGbS8#J7ub#=t&5yj6j28Gd)WJE?_651}-F!lxeLA0zt8u)@NfYf&
z{89+;|6>C>Zl6<5?=jxEOm-Awu|3-ejoZF+l)}Mr-it<g>=Z2ZS#OVn4A6<$_?>tu
zHy=)fxz|BWMW|I7Pg;tuqY;<j90+*oFv^(QxzJ81==w;A{v=5ogemPFquxeTBfI85
zVP}lTK*PKN=P_xuC|o-F4eVEw?n>y+1PwVjo1&le3n39Exw&6N1<(w}p?K%R{WMbY
zp6j9%pSzgoR{N_CGKDfPHKG=j^Lgfb;j*tF(|F%O<RI-e+w+A!Pfy^oCD=d)pA8Mp
zKuEA1*Fk$hPH92%$*QgxOyx~%=Ct1H%vw&nxrOE>9sku82d$j8;QD0k6FbAl@buaX
zjgzxpd^*=DAg?Vz9!mV4zu?fY-`XZa*z$Qk4P0>0YZ)G8S?<`88jaY)Q`_k-YAiSE
zmhD%?Gx=F~EJETEFsj?0Q%t?XIM2gznxPk)c2A=-zOhLlfhazjUCacNw1Rk)xi2^{
z(tc}y*FjC}Y)aK0>mY`X<ta=}oV7OjWNKF|s2tfCoCweIA3Ib$GZE9-dLD^+nBm8C
zqcn<;YmIBuPS!bq9CqE?HZJSQ^&<|N-{N5SgCLydJDa{G2byj4z_fump%ZHuAP40N
z#4>V{DdD>^_+Ou9scr)movY&vT#hbh>_}bCNZkZskAAH1gWleJHfOceqJ)6veg+;j
zp&W#g4MA=Olu9THX$*yE%0NN%+dLMr`WVD+1DuzL*xi5wVj+Nr@gU%<P(K#N)-YZK
zoDA=P9e~rNh`kHAE(*p3EToZz?Sqdu<!~mCL+syah{j=z38M-yKMrOH=mN|DEQ}95
z2OWV&MDjF5kUT}+hIaBSNpK9%k@iVpBu|#4ojhL>Bu|;Q<1L6K?@NS`yl;{Y6EK`q
zfTrO(d2=HD0r=B_X_a6N1K<F_xqwlC%K(X$tbhu@ZGf?WdjVqr4+2I59s?wDIslWQ
ze%AsYDe%GO!lNo+Heftp8DJdXT0rt&v~7Sgz;l2JfL(wpKz0nw2yhZ$65t}hM8M5}
z62QZN5r9_!rGR~aLji~V3bArPO9gxojkW+n9qk2-1pEw;25bjp0NsFt06AE$!GPld
zhX9rW5`Op${;h%fS}4Q`t$_Q%DV2;4E&!zH(X-4PGz%Hw^faPEG)p)-@tcJGir|0X
j`b7kBn6Q0PJhh+vX6}~&IZ@^pfBU8XPn&Ri($Rkcwiq2r

diff --git a/F1:F103/BISS_C_encoders/encoders.creator.user b/F1:F103/BISS_C_encoders/encoders.creator.user
index 3ddf322..32c15f4 100644
--- a/F1:F103/BISS_C_encoders/encoders.creator.user
+++ b/F1:F103/BISS_C_encoders/encoders.creator.user
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE QtCreatorProject>
-<!-- Written by QtCreator 18.0.2, 2026-02-09T20:28:07. -->
+<!-- Written by QtCreator 18.0.2, 2026-02-13T20:51:37. -->
 <qtcreator>
  <data>
   <variable>EnvironmentId</variable>
diff --git a/F1:F103/BISS_C_encoders/flash.c b/F1:F103/BISS_C_encoders/flash.c
index 8e8f9e4..da1feb3 100644
--- a/F1:F103/BISS_C_encoders/flash.c
+++ b/F1:F103/BISS_C_encoders/flash.c
@@ -23,7 +23,9 @@
 #include "usb_dev.h"    // printout
 #include <string.h> // memcpy
 
-extern const uint32_t __varsstart, _BLOCKSIZE;
+extern const uint32_t _BLOCKSIZE;
+extern const user_conf __varsstart;
+
 static const uint32_t FLASH_blocksize = (uint32_t)&_BLOCKSIZE;
 static uint32_t maxCnum = 1024 / sizeof(user_conf); // can't use blocksize here
 
diff --git a/F1:F103/BISS_C_encoders/main.c b/F1:F103/BISS_C_encoders/main.c
index 2cbf7d5..5a3f87a 100644
--- a/F1:F103/BISS_C_encoders/main.c
+++ b/F1:F103/BISS_C_encoders/main.c
@@ -111,7 +111,13 @@ static void proc_enc(uint8_t idx){
         USB_sendstr(iface, str);
         USB_putbyte(iface, '\n');
     }
-    if(result.error) spi_setup(1+idx); // reinit SPI in case of error
+    if(result.error){
+        spi_setup(1+idx); // reinit SPI in case of error
+        if(CDCready[I_CMD] && the_conf.flags.debug){
+            CMDWR("Err, restart SPI "); USB_putbyte(I_CMD, '1'+idx); CMDn();
+        }
+        spi_start_enc(idx); // restart measurement
+    }
     if(the_conf.flags.monit) monitT[idx] = Tms;
     else if(testflag) spi_start_enc(idx);
 }
@@ -142,7 +148,7 @@ int main(){
             else if(l) parse_cmd(inbuff);
             // check if interface connected/disconnected
             // (we CAN'T do much debug output in interrupt functions like linecoding_handler etc, so do it here)
-            for(int i = 0; i < bTotNumEndpoints; ++i){
+            for(int i = 1; i < bTotNumEndpoints; ++i){
                 if(oldCDCready[i] != CDCready[i]){
                     CMDWR("Interface ");
                     CMDWR(u2str(i));
diff --git a/F1:F103/BISS_C_encoders/spi.c b/F1:F103/BISS_C_encoders/spi.c
index 0a5ba10..483e79d 100644
--- a/F1:F103/BISS_C_encoders/spi.c
+++ b/F1:F103/BISS_C_encoders/spi.c
@@ -127,6 +127,7 @@ uint8_t *spi_read_enc(uint8_t encno){
 // @return FALSE if SPI is busy
 // here `encodernum` is 0 (SPI1) or 1 (SPI2), not 1/2 as SPI index!
 int spi_start_enc(int encodernum){
+    //  CMDWR("startenc: "); USB_putbyte(I_CMD, '0'+encodernum); newline(I_CMD);
     int spiidx = encodernum + 1;
     if(spiidx < 1 || spiidx > AMOUNT_OF_SPI) return FALSE;
     if(spi_status[spiidx] != SPI_READY) return FALSE;
diff --git a/F1:F103/BISS_C_encoders/usb_dev.c b/F1:F103/BISS_C_encoders/usb_dev.c
index feee2f4..b61aea8 100644
--- a/F1:F103/BISS_C_encoders/usb_dev.c
+++ b/F1:F103/BISS_C_encoders/usb_dev.c
@@ -69,14 +69,21 @@ static volatile ringbuffer rbin[bTotNumEndpoints] = {IBUF(0), IBUF(1), IBUF(2)};
 static volatile int lastdsz[bTotNumEndpoints] = {-1, -1, -1};
 
 static void chkin(uint8_t ifno){
+    static int ovrflctr = 0; // "antistall" counter
     if(bufovrfl[ifno]) return; // allow user to know that previous buffer was overflowed and cleared
     if(!rcvbuflen[ifno]) return;
     int w = RB_write((ringbuffer*)&rbin[ifno], (uint8_t*)rcvbuf[ifno], rcvbuflen[ifno]);
-    if(w < 0){
-        DBG("Can't write into buffer");
+    if(w < 0){ // buffer busy
+        DBG("Can't write into buffer: busy");
         return;
+    }else if(w == 0){ // no enough space or (WTF) incoming string larger than buffer size
+        if(rcvbuflen[ifno] > rbin[ifno].length || ++ovrflctr > 9999){
+            bufovrfl[ifno] = 1; // real overflow in case if ringbuffer's size less than USB buffer
+            ovrflctr = 0;
+        }else{
+            return; // not enough space
+        }
     }
-    if(w != rcvbuflen[ifno]) bufovrfl[ifno] = 1;
     DBG("Put data into buffer");
     rcvbuflen[ifno] = 0;
     uint16_t status = KEEP_DTOG(USB->EPnR[1+ifno]); // don't change DTOG
@@ -111,14 +118,14 @@ static void send_next(uint8_t ifno){
 
 // data IN/OUT handler
 static void rxtx_handler(){
-    uint8_t ifno = (USB->ISTR & USB_ISTR_EPID) - 1;
+    uint8_t epno = (USB->ISTR & USB_ISTR_EPID), ifno = epno - 1;
     DBG("rxtx_handler");
     DBGs(uhex2str(ifno));
-    if(ifno > bTotNumEndpoints-1){
+    if(epno > bTotNumEndpoints){
         DBG("wrong ifno");
         return;
     }
-    uint16_t epstatus = KEEP_DTOG(USB->EPnR[1+ifno]);
+    uint16_t epstatus = KEEP_DTOG(USB->EPnR[epno]);
     if(RX_FLAG(epstatus)){ // receive data
         DBG("Got data");
         if(rcvbuflen[ifno]){
@@ -126,13 +133,13 @@ static void rxtx_handler(){
             rcvbuflen[ifno] = 0;
             DBG("OVERFULL");
         }
-        rcvbuflen[ifno] = EP_Read(1+ifno, (uint8_t*)rcvbuf[ifno]);
+        rcvbuflen[ifno] = EP_Read(epno, (uint8_t*)rcvbuf[ifno]);
         DBGs(uhex2str(rcvbuflen[ifno]));
-        USB->EPnR[1+ifno] = epstatus & ~(USB_EPnR_CTR_RX | USB_EPnR_STAT_RX | USB_EPnR_STAT_TX); // keep RX in STALL state until read data
+        USB->EPnR[epno] = epstatus & ~(USB_EPnR_CTR_RX | USB_EPnR_STAT_RX | USB_EPnR_STAT_TX); // keep RX in STALL state until read data
         chkin(ifno); // try to write current data into RXbuf if it's not busy
     }else{ // tx successfull
         DBG("Tx OK");
-        USB->EPnR[1+ifno] = (epstatus & ~(USB_EPnR_CTR_TX | USB_EPnR_STAT_TX)) ^ USB_EPnR_STAT_RX;
+        USB->EPnR[epno] = (epstatus & ~(USB_EPnR_CTR_TX | USB_EPnR_STAT_TX)) ^ USB_EPnR_STAT_RX;
         send_next(ifno);
     }
 }
@@ -154,6 +161,7 @@ static void clearbufs(uint8_t ifno){
     while(Tms - T0 < 10){
         if(1 == RB_clearbuf((ringbuffer*)&rbout[ifno])) break;
     }
+    rcvbuflen[ifno] = 0;
 }
 
 // SET_CONTROL_LINE_STATE
@@ -161,9 +169,9 @@ void WEAK clstate_handler(uint8_t ifno, uint16_t val){
     DBG("clstate_handler");
     DBGs(uhex2str(ifno));
     DBGs(uhex2str(val));
+    if(val) clearbufs(ifno); // clear buffers on connect
     CDCready[ifno] = val; // CONTROL_DTR | CONTROL_RTS -> interface connected; 0 -> disconnected
     lastdsz[ifno] = -1;
-    if(val) clearbufs(ifno);
 }
 
 // SEND_BREAK - disconnect interface and clear its buffers
@@ -173,7 +181,6 @@ void WEAK break_handler(uint8_t ifno){
     DBGs(uhex2str(ifno));
 }
 
-
 // USB is configured: setup endpoints
 void set_configuration(){
     DBG("set_configuration()");
@@ -262,7 +269,15 @@ int USB_send(uint8_t ifno, const uint8_t *buf, int len){
         }
         if(!CDCready[ifno]) return FALSE;
         IWDG->KR = IWDG_REFRESH;
-        int a = RB_write((ringbuffer*)&rbout[ifno], buf, len);
+        int l = RB_datalen((ringbuffer*)&rbout[ifno]);
+        if(l < 0) continue;
+        int portion = rbout[ifno].length - 1 - l;
+        if(portion < 1){
+            if(lastdsz[ifno] < 0) send_next(ifno);
+            continue;
+        }
+        if(portion > len) portion = len;
+        int a = RB_write((ringbuffer*)&rbout[ifno], buf, portion);
         if(a > 0){
             len -= a;
             buf += a;
@@ -338,7 +353,9 @@ int USB_receivestr(uint8_t ifno, char *buf, int len){
     }
     int l = RB_readto((ringbuffer*)&rbin[ifno], '\n', (uint8_t*)buf, len);
     if(l < 1){
-        if(rbin[ifno].length == RB_datalen((ringbuffer*)&rbin[ifno])){ // buffer is full but no '\n' found
+        //if(rbin[ifno].length < 1 + RB_datalen((ringbuffer*)&rbin[ifno])){ // buffer is full but no '\n' found
+        if(RB_datalen((ringbuffer*)&rbin[ifno]) >= len){
+            CMDWRn("OVERFULL!");
             while(1 != RB_clearbuf((ringbuffer*)&rbin[ifno]));
             return -1;
         }
diff --git a/F1:F103/BISS_C_encoders/usb_dev.h b/F1:F103/BISS_C_encoders/usb_dev.h
index 5641e20..7308630 100644
--- a/F1:F103/BISS_C_encoders/usb_dev.h
+++ b/F1:F103/BISS_C_encoders/usb_dev.h
@@ -47,7 +47,7 @@ void clstate_handler(uint8_t ifno, uint16_t val);
 void linecoding_handler(uint8_t ifno, usb_LineCoding *lc);
 
 // as ugly CDC have no BREAK after disconnected client in non-canonical mode, we should use timeout - more than 2ms
-#define DISCONN_TMOUT   (2)
+#define DISCONN_TMOUT   (1000)
 
 // sizes of ringbuffers for outgoing and incoming data
 #define RBOUTSZ     (512)
diff --git a/F1:F103/BISS_C_encoders/version.inc b/F1:F103/BISS_C_encoders/version.inc
index 00fd981..ebc3fa9 100644
--- a/F1:F103/BISS_C_encoders/version.inc
+++ b/F1:F103/BISS_C_encoders/version.inc
@@ -1,2 +1,2 @@
-#define BUILD_NUMBER "130"
-#define BUILD_DATE "2026-02-09"
+#define BUILD_NUMBER "144"
+#define BUILD_DATE "2026-02-13"
diff --git a/F3:F303/InterfaceBoard/flash.c b/F3:F303/InterfaceBoard/flash.c
index 496eaf2..7f62333 100644
--- a/F3:F303/InterfaceBoard/flash.c
+++ b/F3:F303/InterfaceBoard/flash.c
@@ -23,7 +23,8 @@
 #include "usb_descr.h"  // descriptors
 #include <string.h> // memcpy
 
-extern const uint32_t __varsstart, _BLOCKSIZE;
+extern const uint32_t _BLOCKSIZE;
+extern const user_conf __varsstart;
 static const uint32_t FLASH_blocksize = (uint32_t)&_BLOCKSIZE;
 static uint32_t maxCnum = 2048 / sizeof(user_conf); // can't use blocksize here
 
diff --git a/F3:F303/InterfaceBoard/usb_dev.c b/F3:F303/InterfaceBoard/usb_dev.c
index 0c90964..7256b33 100644
--- a/F3:F303/InterfaceBoard/usb_dev.c
+++ b/F3:F303/InterfaceBoard/usb_dev.c
@@ -59,13 +59,20 @@ static volatile ringbuffer rbin[InterfacesAmount] = {IBUF(0), IBUF(1), IBUF(2),
 static volatile int lastdsz[InterfacesAmount] = {-1, -1, -1, -1, -1, -1, -1};
 
 static void chkin(uint8_t ifno){
+    static int ovrflctr = 0; // "antistall" counter
     if(bufovrfl[ifno]) return; // allow user to know that previous buffer was overflowed and cleared
     if(!rcvbuflen[ifno]) return;
     int w = RB_write((ringbuffer*)&rbin[ifno], (uint8_t*)rcvbuf[ifno], rcvbuflen[ifno]);
-    if(w < 0){
+    if(w < 0){ // buffer busy
         return;
+    }else if(w == 0){ // no enough space or (WTF) incoming string larger than buffer size
+        if(rcvbuflen[ifno] > rbin[ifno].length || ++ovrflctr > 9999){
+            bufovrfl[ifno] = 1; // real overflow in case if ringbuffer's size less than USB buffer
+            ovrflctr = 0;
+        }else{
+            return; // not enough space
+        }
     }
-    if(w != rcvbuflen[ifno]) bufovrfl[ifno] = 1;
     rcvbuflen[ifno] = 0;
     uint16_t status = KEEP_DTOG(USB->EPnR[1+ifno]); // don't change DTOG
     USB->EPnR[1+ifno] = (status & ~(USB_EPnR_STAT_TX|USB_EPnR_CTR_RX)) ^ USB_EPnR_STAT_RX; // prepare to get next data portion
@@ -96,7 +103,7 @@ static void send_next(uint8_t ifno){
 // data IN/OUT handler
 static void rxtx_handler(){
     uint8_t epno = (USB->ISTR & USB_ISTR_EPID), ifno = epno - 1;
-    if(ifno > InterfacesAmount-1){
+    if(epno > InterfacesAmount){
         return;
     }
     uint16_t epstatus = KEEP_DTOG(USB->EPnR[epno]);
@@ -130,6 +137,7 @@ static void clearbufs(uint8_t ifno){
     while(Tms - T0 < 10){
         if(1 == RB_clearbuf((ringbuffer*)&rbout[ifno])) break;
     }
+    rcvbuflen[ifno] = 0;
 }
 
 // SET_CONTROL_LINE_STATE
@@ -200,7 +208,7 @@ int USB_sendall(uint8_t ifno){
     uint32_t T0 = Tms;
     while(lastdsz[ifno] > 0){
         if(Tms - T0 > DISCONN_TMOUT){
-            //break_handler(ifno);
+            break_handler(ifno);
             return FALSE;
         }
         if(!CDCready[ifno]) return FALSE;
@@ -215,7 +223,7 @@ int USB_send(uint8_t ifno, const uint8_t *buf, int len){
     uint32_t T0 = Tms;
     while(len){
         if(Tms - T0 > DISCONN_TMOUT){
-            //break_handler(ifno);
+            break_handler(ifno);
             return FALSE;
         }
         if(!CDCready[ifno]) return FALSE;
@@ -246,7 +254,7 @@ int USB_putbyte(uint8_t ifno, uint8_t byte){
     uint32_t T0 = Tms;
     while((l = RB_write((ringbuffer*)&rbout[ifno], &byte, 1)) != 1){
         if(Tms - T0 > DISCONN_TMOUT){
-            //break_handler(ifno);
+            break_handler(ifno);
             return FALSE;
         }
         if(!CDCready[ifno]) return FALSE;
diff --git a/F3:F303/USB_template/Readme b/F3:F303/USB_template/Readme
new file mode 100644
index 0000000..dff4ff4
--- /dev/null
+++ b/F3:F303/USB_template/Readme
@@ -0,0 +1 @@
+The more fresh USB see in InterfaceBoard
diff --git a/F3:F303/USB_template_CDC/Readme b/F3:F303/USB_template_CDC/Readme
new file mode 100644
index 0000000..dff4ff4
--- /dev/null
+++ b/F3:F303/USB_template_CDC/Readme
@@ -0,0 +1 @@
+The more fresh USB see in InterfaceBoard
diff --git a/snippets/usb_pl2303/Readme b/snippets/usb_pl2303/Readme
index cf9dc25..7749373 100644
--- a/snippets/usb_pl2303/Readme
+++ b/snippets/usb_pl2303/Readme
@@ -1,3 +1,5 @@
+The more fresh USB see in F3:InterfaceBoard
+
 Actual snipper for all MCUs (just fix usbhw.c and usbhw.h)
 
 If USB DP/DM pins need to be setting up, do it before calling USB_setup().