From:	"Damian Yerrick" <web DOT poison AT pineight DOT 8m DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Portable code for accessing the hardware ports under DOS and Linux
Date:	Fri, 8 Oct 1999 16:45:04 -0500
Organization:	Rose-Hulman Institute of Technology
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From: Pablo M. Dotro <pyd AT sion DOT com>
Newsgroups: comp.os.msdos.djgpp
To: <djgpp AT delorie DOT com>

You double posted. Post your article either to c.o.m.d or to
the mail address; otherwise, it'll appear twice in both places.

> Hi to all!
>
> I am creating a special made data adquisition software for
> one of the Physics labs of the university in which I work, and
> I have a mixed DOS/Win95 and Linux network.

DOS emulation software on Linux is pretty mature.

> My idea is to create a software that has to have the same
> look and feel under DOS and under Linux (probably using
> ncurses or sth. like that).

I would suggest Allegro for the visual interface. Allegro code
will compile under DJGPP, M$ Visual C++, and Linux gcc
with about three tiny source code changes per platform.
http://www.talula.demon.co.uk/allegro/

To see what can be done with Allegro, especially how
easy it is to write source that compiles under many
platforms, look at the source for DOSArena.
http://come.to/yerrick

> So I decided to use DJGPP for the DOS/Win95 machines
> and the GCC of my RedHat 5.2 in the others. As far as I know,
> under DOS there are a couple of functions (inportb() and
> outportb()) which handle the access to the hardware ports
> (I need to access port 0x220),

PC I/O port 0x220 is in the Sound Blaster region. If your
acquisition hardware emulates a Sound Blaster, then
Allegro has portable code to control it.

> but I do not know if they work under Linux... I've tested,
> and they do not seem ot exist under Linux, so either I have
> to use some other function or I need to add another include
> file under my Linux project.
> Does anyone knows if there is a protable way to access
> hardware ports (without assembler)? Are there any
> standard functions to do this?

Not all platforms have I/O ports; therefore, a standard such as
the C standard or the C++ standard cannot include hardware
I/O port access. Anything in the way of I/O ports will always be
implementation defined.


Damian Yerrick

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