Code:
/*
* example.c: very simple example of port I/O
*
* This code does nothing useful, just a port write, a pause,
* and a port read. Compile with `gcc -O2 -o example example.c',
* and run as root with `./example'.
*/
#include <stdio.h>
#include <unistd.h>
#include <asm/io.h>
#define BASEPORT 0x378 /* lp1 */
int main() {
/* Get access to the ports */
if (ioperm(BASEPORT, 3, 1)) {
perror("ioperm");
exit(1);
}
/* Set the data signals (D0-7) of the port to all low (0) */
outb(0, BASEPORT);
/* Sleep for a while (100 ms) */
usleep(100000);
/* Read from the status port (BASE+1) and display the result */
printf("status: %d\n", inb(BASEPORT + 1));
/* We don't need the ports anymore */
if (ioperm(BASEPORT, 3, 0)) {
perror("ioperm");
exit(1);
}
return 0;
}
/* end of example.c */
Naravno, moraš imati pravo pristupa paralelnom portu.
Pogledaj Linux I/O port programming mini-HOWTO.
parallel port.program??????
Re: parallel port.program??????
