From:	"David Christensen" <dchristensen AT california DOT com>
Newsgroups:	comp.os.msdos.djgpp,comp.lang.perl.misc
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Subject:	Re: djgpp, Win98, Perl, and serial port
Date:	Thu, 19 Aug 1999 12:05:02 -0700
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<Permission to post obtained from author -- David>

-----Original Message-----
From: Bbirthisel AT aol DOT com <Bbirthisel AT aol DOT com>
To: dchristensen AT california DOT com <dchristensen AT california DOT com>
Date: Tuesday, August 17, 1999 9:01 AM
Subject: Re: djgpp, Win98, Perl, and serial port


In [various messages] Shigenobu Okuyama writes:

|>   I found some serial port libraries on GNU sites.
|>
|>   - v2tk/bcsio20.zip    Bill Currie's Serial Comms Package
|>   - v2tk/pmcom10.zip    Peter Marinov's serial com port toolkit
|>   - v2tk/svas011b.zip   Samuel Vincent's serial port library

|>   In this weekend, I wrote some extended functions of perl by XS
language which provides only the low level interface to Peter
Marinov's kit. I am trying the functions of sending/receiving a
char. and a string with some perl scripts. That's successful for
now.

A fourth choice!


|>   Peter Marinov's kit (uploaded on 98-10-27) is a good one. If
you are interested in it I think you should try to use it. I can
test it now by perl scripts through the low level interface.

|>   Last week, I started to write some middle level functions. In
my plan, almost low level functions are arranged to some middle
level functions. These are written by XS language. The low level
functions will be unnecessary in future, which will be hidden to
reduce code size.
|>
|>   The middle level functions I wrote are;
|>
|>  comopen()   open a serial port
|>  comclose()  close serial ports
|>  comsetprm() set transmit parameters of a serial port
|>  comgetprm() get transmit parameters of a serial port
|>  comwrite()  write to a serial port
|>  comread()   read from a serial port
|>  comsetmcr() set MCR (modem control register) of a serial port
|>  comgetmsr() get MSR (modem status register) of a serial port
|>
|>   I feel the set of these functions is incomplete. Because
simple binary level transmfer can be executed by using comwrite()
and comread(), but text level transmfer requires many cares.

And there are a bunch of timing and buffer management issues as
well. In
his case, he needed a compact (runs on ramdisk or floppy) solution
and
was willing to trade off performance for it. I don't think that is
your
situation.







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