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From: "Dave Korn" <dk AT artimi DOT com>
To: <cygwin AT cygwin DOT com>
Subject: RE: stty under cygwin
Date: Wed, 21 Apr 2004 16:55:31 +0100
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In-Reply-To: <40869605.8060106@yahoo.fr>
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X-OriginalArrivalTime: 21 Apr 2004 15:55:31.0578 (UTC) FILETIME=[1314CDA0:01C427B9]

> -----Original Message-----
> From: cygwin-owner On Behalf Of bertrand marquis
> Sent: 21 April 2004 16:41

> i need to use stty to send commands through the serial port 
> under cygwin:

  That's not what stty is for.

> stty 
> 1:0:cbd:0:3:1c:7f:15:4:5:1:0:11:13:1a:0:12:f:17:16:0:0:0:0:0:0
> :0:0:0:0:0:0:0:0:0:0 
> < /dev/ttyS0
> 
> but stty answer me that 1:...:0 is a wrong argument ?
> I'm using the last version of cygwin and the serial port is working
> 
> anyone has an idea ?

#1:  You've completely misunderstood stty.  It allows you to set parameters
such as baud rate, flow control, char translation, etc. for a serial port.
It's not for sending data in or out of it.

#2:  That string of colon-separated hex numbers doesn't mean anything to
stty.  None of the arguments it understands come in that form.

#3:  If you're trying to send something out the serial port, you should be
using "> /dev/ttyS0", not "< /dev/ttyS0".  You're telling stty to take any
standard input it requires from the serial port.  That's not going to work.

#4:  Haven't you ever heard of the "--help" option, or the "man" or "info"
utilities?  Repeat after me:

stty --help
man stty
info stty

over and over again until you've got it memorized!

#5:  At a guess, you want to turn those hex numbers into actual bytes sent
out the serial port.  Why do you have 'cbd' as one of them?  That's too
large for a byte-sized value.

#6:  To send data out the serial port, use echo or cat (depending where the
data is), and redirect it to the serial port with  >/dev/ttyS0.

#7:  I dunno how you'd get hex numbers converted into actual bytes at the
command line.  You need a command that does the opposite of "od".  Assuming
there was such a thing, you could then write

echo
1:0:cbd:0:3:1c:7f:15:4:5:1:0:11:13:1a:0:12:f:17:16:0:0:0:0:0:0:0:0:0:0:0:0:0
:0:0:0 |  [opposite-of-od] | cat > /dev/ttyS0

(that's all one line; sorry about any wrapping).


    cheers, 
      DaveK
-- 
Can't think of a witty .sigline today....


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