Using LPT port

[Hai Ly Hoang]

I'm working on a project that make use of LPT (printer port) to connect to
AT89C51 chip.
Under DOS, i use inport, outport() function of turbo c++ to write byte to
3F8 port (printer port). How can i do such thing in windows (or exactly, how
i write a program that can control the printer port directly ?)
Thanks in advance

[Andy Sinclair]

Re: Using LPT port

Hai Ly Hoang wrote:[color=blue]
>I'm working on a project that make use of LPT (printer port) to connect to
>AT89C51 chip.
>Under DOS, i use inport, outport() function of turbo c++ to write byte to
>3F8 port (printer port). How can i do such thing in windows (or exactly, how
>i write a program that can control the printer port directly ?)
>Thanks in advance[/color]

http://www.lvr.com/parport.htm

[Michel Leunen]

Re: Using LPT port

Hai Ly Hoang wrote:
[color=blue]
> Under DOS, i use inport, outport() function of turbo c++ to write byte to
> 3F8 port (printer port). How can i do such thing in windows (or exactly, how
> i write a program that can control the printer port directly ?)[/color]

Under Windows, you need a device driver to access the IO ports. You can
either create your own using teh Device Driver Kit from Microsoft (DDK)
or use one of the generic device drivers available on the net. Do a
search on DlPortIO with google, for instance.

Michel
--
----------------------------------------
Michel Leunen
mailto:michel@l eunen.com

http://www.leunen.com/cbuilder/

----------------------------------------

[Jordi Maycas]

Re: Using LPT port

or you can use asm in, and out instructions.

asm in port,byte
asm out port,byte

You can use asm inside the c code (you must have the masm, or tasm
compiler).


"Andy Sinclair" <andy@r2g2.nosp amplease.co.uk> escribió en el mensaje
news:upa7pv8b84 70mreefcf0621cb ovqoloavt@4ax.c om...[color=blue]
> Hai Ly Hoang wrote:[color=green]
> >I'm working on a project that make use of LPT (printer port) to connect[/color][/color]
to[color=blue][color=green]
> >AT89C51 chip.
> >Under DOS, i use inport, outport() function of turbo c++ to write byte[/color][/color]
to[color=blue][color=green]
> >3F8 port (printer port). How can i do such thing in windows (or exactly,[/color][/color]
how[color=blue][color=green]
> >i write a program that can control the printer port directly ?)
> >Thanks in advance[/color]
>
> http://www.lvr.com/parport.htm
>[/color]

[Igor Tandetnik]

Re: Using LPT port

"Jordi Maycas" <jmaycas@hotmai l.com> wrote in message
news:O3PsW6gmDH A.2772@TK2MSFTN GP12.phx.gbl...[color=blue]
> or you can use asm in, and out instructions.
>
> asm in port,byte
> asm out port,byte[/color]

Only works on Win9x, but not on the real OS (WinNT, 2K and so on).
NT-bases OS prevents user-mode programs from directly accessing hardware
ports.
--
With best wishes,
Igor Tandetnik

"For every complex problem, there is a solution that is simple, neat,
and wrong." H.L. Mencken