Date: Wed, 6 Feb 2013 11:40:57 +0330 From: s m <sam.gh1986@gmail.com> To: Polytropon <freebsd@edvax.de> Cc: freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: backspace shows ^? in serial communications Message-ID: <CAA_1SgE8FEe92a03rw_X4eMF3uvvjkD37GrLZzE5zzB_gQngCw@mail.gmail.com> In-Reply-To: <20130206075050.b4e5b48e.freebsd@edvax.de> References: <CAA_1SgEi27zfihTopo6BfQ2fr_sBUew4u3M0Y1oV67c=bDQ5Cw@mail.gmail.com> <20130206075050.b4e5b48e.freebsd@edvax.de>
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thanks for your answer. you know, i have a freebsd box (something like router) which i connect to it by putty or other terminal programs (cu,...). this router has a serial card and i have a c program to open and manage serial ports. now when i run this c program and connect to the third freebsd box, backspace shows ^?. now i don't know where is problem and for which system terminal settings should be checked. from you explanation i think that i should check serial settings in c program in the router box. am i right? please let me know what should i do to this program (c program in router box) show backspace correctly when i connect by different serial programs to router box and run it. thanks On Wed, Feb 6, 2013 at 10:20 AM, Polytropon <freebsd@edvax.de> wrote: > On Wed, 6 Feb 2013 09:44:37 +0330, s m wrote: > > hi all > > > > i have a problem with backspace in serial communications. i have a > > freebsd8.2 box with a serial card on it. when i connect to other freebsd > > box via serial port backspace does not act as i expected. backspace shows > > ^? on screen. i searched alot and find out that stty has two parameters > > -erase and erase2- to identify erase characters in terminal and they > should > > be set correctly. i set erase and erase2 to ^? by "stty erase \^?" and > > "stty erase2 \^?" commands but nothing happened. > > please let me know how i can fix it. i know it is simple issue but i > really > > do not know how to do that. > > If I remember correctly, ^? is delete, ^H is backspace. You > should check your terminal emulator if it outputs ^? instead > of ^H when you press the backspace key. > > FreeBSD's default configuration handles keys correctly (if > you have the proper terminal emulation set, e. g. vt100 or > vt220 for your serial line), so there's probably something > wrong with the settings of the terminal program you're using. > > For comparison: > > % echo $TERM > xterm > % stty -a > speed 9600 baud; 24 rows; 80 columns; > lflags: icanon isig iexten echo echoe echok echoke -echonl echoctl > -echoprt -altwerase -noflsh -tostop -flusho -pendin -nokerninfo > -extproc > iflags: -istrip icrnl -inlcr -igncr ixon -ixoff -ixany -imaxbel -ignbrk > -brkint -inpck -ignpar -parmrk > oflags: opost onlcr -ocrnl tab3 -onocr -onlret > cflags: cread cs8 parenb -parodd hupcl -clocal -cstopb -crtscts -dsrflow > -dtrflow -mdmbuf > cchars: discard = ^O; dsusp = ^Y; eof = ^D; eol = <undef>; > eol2 = <undef>; erase = ^H; erase2 = ^H; intr = ^C; kill = ^U; > lnext = ^V; min = 1; quit = ^\; reprint = ^R; start = ^Q; > status = ^T; stop = ^S; susp = ^Z; time = 0; werase = ^W; > > And: > > % echo $TERM > cons25l1 > % stty -a > speed 9600 baud; 25 rows; 80 columns; > lflags: icanon isig iexten echo echoe -echok echoke -echonl echoctl > -echoprt -altwerase -noflsh -tostop -flusho -pendin -nokerninfo > -extproc > iflags: -istrip icrnl -inlcr -igncr ixon -ixoff ixany imaxbel -ignbrk > brkint -inpck -ignpar -parmrk > oflags: opost onlcr -ocrnl tab0 -onocr -onlret > cflags: cread cs8 -parenb -parodd hupcl -clocal -cstopb -crtscts -dsrflow > -dtrflow -mdmbuf > cchars: discard = ^O; dsusp = ^Y; eof = ^D; eol = <undef>; > eol2 = <undef>; erase = ^H; erase2 = ^H; intr = ^C; kill = ^U; > lnext = ^V; min = 1; quit = ^\; reprint = ^R; start = ^Q; > status = ^T; stop = ^S; susp = ^Z; time = 0; werase = ^W; > > If you want the system's C shell to treat ^? (delete) as > it should be treated (perform delete instead of backspace > or "nothing"), add those to your .cshrc: > > bindkey ^? delete-char # for console > bindkey ^[[3~ delete-char # for xterm > > Note that this only affects the C shell. > > > > -- > Polytropon > Magdeburg, Germany > Happy FreeBSD user since 4.0 > Andra moi ennepe, Mousa, ... >
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