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Side 3 av 4
Det lille c programmet som liver opp lysene er dette:
/*
Program for å lyse opp LEDs i en liten krets
Jens Christoffersen
2009
*/
// includes
#include
#include
#include
#include
#include
// definitions
#define base 0x3bc // parallel port address
#define sleeping 1000000 // time for led to light
main(int argc, char **argv)
{
if (ioperm(base,1,1)) // open the parallel port
fprintf(stderr, "Couldn't get the port at %x\n", base), exit(1); // error mesg if not open
outb(0, base); // set all pins to 0 = low
outb(1, base); // outb = write, 1 = send 1/high to pin 2, base = par port add 3bc
printf ("Pin 2 set to high.\n"); // mesg to screen
usleep(sleeping); // wait for 1 sec
outb(2, base);
printf ("Pin 3 set to high.\n");
usleep(sleeping);
outb(4, base);
printf ("Pin 4 set to high.\n");
usleep(sleeping);
outb(8, base);
printf ("Pin 5 set to high.\n");
usleep(sleeping);
outb(16, base);
printf ("Pin 6 set to high.\n");
usleep(sleeping);
outb(32, base);
printf ("Pin 7 set to high.\n");
usleep(sleeping);
outb(64, base);
printf ("Pin 8 set to high.\n");
usleep(sleeping);
outb(0, base); // set all pins to 0 = low
return 0;
}
Siden jeg bare hadde en kat 5 kabel tilgjenelig, har jeg utelatt den siste pinnen. Koden for den ville være:
outb(128, base);
printf(Pin 9 set to high.\n");
usleep(sleeping);
Dette programmet har jeg kompilert med kommandoen:
gcc -O light-led.c -o light-led
(Jeg har en Ubuntu 9.04 installasjon med build-essentials pakken installert)
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Programmering 
