Date: Tue, 23 Mar 2004 09:33:32 +0000 From: "Richard P. Williamson" <richard.williamson@u4eatech.com> To: freebsd-questions@freebsd.org Subject: Re: Serial port (com1) baud rate oddity Message-ID: <6.0.3.0.2.20040323085825.02512f60@cygnus> In-Reply-To: <6.0.3.0.2.20040323082308.02513710@cygnus> References: <6.0.3.0.2.20040322152842.024b8900@cygnus> <20040322174108.GJ36839@nkinkade.bmp.ub> <6.0.3.0.2.20040323082308.02513710@cygnus>
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At 08:31 23/03/2004, Richard P. Williamson wrote:
>At 17:41 22/03/2004, Nathan Kinkade wrote:
>>tip gets it configurations from /etc/remote. Make sure that "com1" in
>>/etc/remote is set with appropriate values. The default is:
>>
>>sio0|com1:dv=/dev/cuaa0:br#9600:pa=none:
According to stty, ba is 1355.
blah# stty -a -f /dev/ttyd0
speed 1355 baud; 0 rows; 0 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 oxtabs 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 = ^?; 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;
On the sink machine, I did 'tip -1355 com1' and got text instead
of @@ @@@@@@ @ @ @@@ etc. But why did the source machine decide
to use 1355 in the first place?
blah# grep com1 /etc/remote
com1:dv=/dev/cuaa0:br#9600:pa=none:
blah# grep 1355 /etc/*
services:intuitive-edge 1355/tcp #Intuitive Edge
services:intuitive-edge 1355/udp #Intuitive Edge
blah#
This is what happens if I try to force it to 9600:
blah# stty -f /dev/ttyd0 speed 9600
1355
blah# stty -f /dev/ttyd0 9600
blah# stty -a -f /dev/ttyd0
speed 1355 baud; 0 rows; 0 columns;
...
Possibly it won't let me adjust the baud rate, as the device is busy:
blah# tip com1
tip: /dev/cuaa0: Device busy
link down
blah#
So how can I idle the device long enough to try resetting the
speed?
blah# sleep 60 vs. Seiko is a dead heat, so at least the system
clock appears to be ticking at the correct rate.
rip
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