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Message-ID: <4086A1D2.7A8A84DA@iee.org>
Date: Wed, 21 Apr 2004 17:31:14 +0100
From: Don Sharp <dwsharp AT iee DOT org>
MIME-Version: 1.0
To: gnuwin32 <cygwin AT cygwin DOT com>
Subject: Re: stty under cygwin
References: <NUTMEGb610MVlg0MxeJ00000549 AT NUTMEG DOT CAM DOT ARTIMI DOT COM>
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Dave Korn wrote:
> 
> > -----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!


Suggest you look at the -g option to stty

$ stty -g
50e:9:b0:d1f:0:f:0:0:4:8:3:15:16:1:1c:12:11:13:1a:0:0:17

Cheers

Don Sharp


> 
> #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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