LinuxQuestions.org
Welcome to the most active Linux Forum on the web.
Go Back   LinuxQuestions.org > Blogs > peonuser
User Name
Password

Notices

Rate this Entry

More details.

Posted 12-07-2011 at 10:45 AM by peonuser
Updated 12-10-2011 at 12:29 AM by peonuser

Basic circuit.




-------------------------------------------------------
C code to turn pins on and off parallelport light controller. of course the compiled code will called from a bash script.

/*
* Simple parallel port output control program for Linux
* Written and copyright by Tomi Engdahl 1998
* (e-mail: tomi.engdahl@hut.fi)
*
* The program output the data value to PC parallel port data pins
* (default lpt1 I/O address 0x378). The data values are given as the
* command line parameter to the program. The number can be
* in decimal (0..255) or hexadecimal format (0x00..0xFF).
*
*/

#include <stdio.h>
#include </usr/include/stdlib.h>
#include <unistd.h>
#include <sys/io.h>

#define base 0x378 /* printer port base address */

main(int argc, char **argv)
{
int value;

if (argc!=2)
fprintf(stderr, "Error: Wrong number of arguments. This program needs one argument which is number between 0 and 255.\n"), exit(1);
if (sscanf(argv[1],"%i",&value)!=1)
fprintf(stderr, "Error: Parameter is not a number.\n"), exit(1);
if ((value<0) || (value>255))
fprintf(stderr, "Error: Invalid numeric value. The parameter number must be between 0 and 255\n"), exit(1);
if (ioperm(base,1,1))
fprintf(stderr, "Error: Couldn't get the port at %x\n", base), exit(1);

outb((unsigned char)value, base);
}
--------------------------------------------------------------
#Simple bash script
let nodf=255
declare -i X=$nodf
while true; do
NUM=$[ ( $RANDOM % $X ) + 1 ]
lptout $num
# timing loop here.
done
Posted in Uncategorized
Views 286 Comments 0
« Prev     Main     Next »
Total Comments 0

Comments

 

  



All times are GMT -5. The time now is 05:15 AM.

Main Menu
Advertisement

Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
identi.ca: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration