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Date: Thu, 28 Apr 2005 16:59:36 -0400 (EDT)
From: Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To: cygwin AT cygwin DOT com
To: rwj <r_wray_johnson AT yahoo DOT com>
cc: cygwin AT cygwin DOT com
Subject: Re: can't access Serial Ports
In-Reply-To: <20050428204626.29949.qmail@web54701.mail.yahoo.com>
Message-ID: <Pine.GSO.4.61.0504281654450.1962@slinky.cs.nyu.edu>
References: <20050428204626 DOT 29949 DOT qmail AT web54701 DOT mail DOT yahoo DOT com>
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On Thu, 28 Apr 2005, rwj wrote:

> Hi,
>
> I just recently installed cygwin on my WinXP box here at work.  I am
> trying to migrate my Perl scripts over to the cygwin environment.
>
> But now I can not access my Serial Ports thru cygwin.  for instance,
> when I tried installing a serial port device module for perl, the make
> file died with the following error:
>
>      could not open port '/dev/ttyS1'.  Are permissions correct?
>
> i went to look in my root cygwin directory, and i dont even have a /dev
> directory.  all of my websearches on this subject finds info that
> assumes my /dev/ttyS<x> is available.

/dev is currently a virtual directory in Cygwin.  Try "ls -l /dev/ttyS1"
-- you should get a listing.  If you want Tab-completion, or if you want
"find /" to look at the devices in /dev, you can create the /dev directory
and even populate it with dummy (and real) directory entries -- see
<http://www.cygwin.com/cygwin-ug-net/using-specialnames.html> for a script
to do this.  Otherwise, don't bother.

> does cygwin normally not install a /dev directory?  do i need to create
> this manually?  I am not sure what to do here, and this is a major
> stumbling block. Much of my work involves testing serial ports, modems,
> etc.

Are you sure you're trying to open the right serial port?  /dev/ttyS1
corresponds to COM2 in Windows.  If you want COM1, you need /dev/ttyS0.

> For the record, all of these still work in the Win32 environment, just
> not in cygwin.

"All of these" means "serial ports", I presume.  What did you use to test
them?
HTH,
	Igor
-- 
				http://cs.nyu.edu/~pechtcha/
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ZZZzz /,`.-'`'    -.  ;-;;,_		igor AT watson DOT ibm DOT com
     |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski, Ph.D.
    '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!

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