From mboxrd@z Thu Jan  1 00:00:00 1970
From: teo_icKs <teo_icKs@yahoo.it>
Subject: Re: newbie...please help.....
Date: Thu, 26 Sep 2002 10:45:46 +0200
Sender: linux-8086-owner@vger.kernel.org
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hi,=20

if you want to make bin in ELKS (and you haven't its libc)you must use
its include file with bcc and then statically link file object in your
app;
First of all install ELKS source files (for ex. /usr/src/elks) in your
linux
environment; instead use bcc in this way:

bcc -0 -ansi -I/usr/bcc/include/ -I/usr/src/elks/include/ -o
Parallela  	          parallela.c /usr/src/elks/arch/i86/lib/outportb.o

the modified source code of your app...

#include<arch/io.h>   /* is the correct position of io.h in ELKS */
#include<unistd.h>=20
int main()=20
{=20
       /*- ioperm(0x378,3,1);  to enable access to the parallel port..=20
				not implement				*/
=09
       for(;;){=20
       		outb(0x88,0x378); /* writing 0x88 or 10001000b to the data=20
            	                     pins..thereby lighting the LEDs.... */
       }=20
}=20

before this you must compile the implementation of outb function; this
is an assembly file in the source code of ELKS kernel.=20
If have you compiled the Kernel ..... good=20
(you can link directly the object file> outportb.o)
else learn to make it!!!! :-)

If you have the small version of libc, don't you need to statically link
it in your app.

> whenever i am running the above program after compiling thru gcc...i get =

> the LEDs lighted, alright...but the other LEDs that are not supposed=20
> to light up..also light up and then light off..although very fast...for=20
> example if i write hex F8 on the data port...=20
> what i should get is this: on on on on on off off off in my LEDs...=20
> but the last three LEDs switch between on and off states very fast..thus =

> what i get actually is a series of alternating F8 and FF in my=20
> LEDs...can u suggest any thing???=20

THis effect is probably caused by another process who use this port;
Kill all suspected process and try it again! ....:-0
With ELKS kernel and the code that I have fixed, this problem there
isn't.

Now I don't know what process could uses your parallel port... =20

however in Linux kernel, use this port with read, write, open and the
other syscall! It's safer then the direct access to register.

teo_icKs    ....    ....     ....    .....    ....
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