RE: [Dev-C++] _outp & _inp under windows 2000

[Per W. <pw...@ia...>]

Sorry, but normally you can't have a portable way of accessing I/O ports,
since I/O ports are handled by the OS drivers.

For some special ports, such as COM, LPT, the OS have reasonable
high-level access methods that wxWindows etc may use to support portable
applications.

For the majority of ports - such as data acquisition boards, sound cards
etc, you normally have to write dedicated low-level drivers for the
access.

There are a couple of companies that sells multi-platform driver SDK
tools, where they supply a low-level assembler part for different OS, and
you write a higher-level C/C++ "busines-logic" for the hardware. Thereby,
you don't have to know everything about the different operating systems.

Old data acquisition software written for MsDos, Win 3.1, Win95, Win98 etc
are designed for a situation where there either doesn't exist a memory
management unit or no privileged CPU instructions, or where the operating
system gives carte blanche and allows a relatively free read/write in the
IO and expansion board memory address spaces. This means that the doesn't
make use of device drivers, but instead perform port IO or memory
operations directly to the hardware.

To get such a software to work on a new OS, without rewriting the
software, would require the OS exception handler to catch illegal memory
and IO accesses and depending on source and/or target perform the same
operation instead, and then return the result to the application as if the
application had done it itself. Such emulation creates a HUGE overhead
meaning that it's only meaningful to even think about it for low-speed
devices.

/Per W

On Wed, 22 Jan 2003, Santiago Palmier Campos wrote:

> Hi *,
>
> You can consider porting your app to wxWindows, it is not only a GUI
> library, it is a complete portable framework.
> You can use the latest wxWindows stable release (2.4.0) and wxCTB
> communications package by Joachim Buermann (http://www.iftools.com/), it =
is
> not GUI based so it can be used in console apps.
>
> It's an "easy" way to have a portable app that accesses I/O ports...
>
> Regards,
> Santy
>
> -----Original Message-----
> From: Flameeyes [mailto:dap...@li...]
> Sent: mi=E9rcoles, 22 de enero de 2003 19:09
> To: dev...@li...
> Subject: Re: [Dev-C++] _outp & _inp under windows 2000
>
>
> Mark Smith wrote:
> > I have some data acquisition software which runs OK on win98 but
> > because you cannot address the hardware directly with win 2000 it wont
> > work, It is a console based application,  is there an easy way for me
> > to modify the code so it will run under win 2000?
> I think that you can't.
> Only SYSTEM level software can access directly the I/O ports, all other
> software can only open it as a file [and is not a great method, i tried
> it for one program].
>
> --
> Flameeyes
>
>
>
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