Re: newbie...please help.....

[teo_icKs <teo_icKs@yahoo.it>]

hi, 

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> 
int main() 
{ 
       /*- ioperm(0x378,3,1);  to enable access to the parallel port.. 
				not implement				*/
	
       for(;;){ 
       		outb(0x88,0x378); /* writing 0x88 or 10001000b to the data 
            	                     pins..thereby lighting the LEDs.... */
       } 
} 

before this you must compile the implementation of outb function; this
is an assembly file in the source code of ELKS kernel. 
If have you compiled the Kernel ..... good 
(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 
> to light up..also light up and then light off..although very fast...for 
> example if i write hex F8 on the data port... 
> what i should get is this: on on on on on off off off in my LEDs... 
> 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 
> LEDs...can u suggest any thing??? 

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...  

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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