root/paper-tape-project/trunk/userspace-driver/setoff-strobe.c

/* This will stop the strobe signal */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h> /* lowlevel io */
#include <errno.h>

#include <sys/ioctl.h> 
#include <linux/ppdev.h>
#include <linux/parport.h>

#define DEBUG
#define PARPORT_DEVICE "/dev/parport0"

int main(int argc, char **argv) {
        int parport_fd;
        int mode; /* IEEE1284_MODE_COMAT == compatibility mode */
        
        parport_fd = open(PARPORT_DEVICE, O_RDWR);
        if(parport_fd == -1) {
                perror("open device failed");
                return 1;
        }

        if(ioctl(parport_fd, PPCLAIM)) {
                perror ("claiming port (PPCLAIM)");
                close (parport_fd);
                return 1;
        }

        mode = IEEE1284_MODE_COMPAT;
        if(ioctl(parport_fd, PPNEGOT, &mode)) {
                perror ("Setting compatibilty mode (PPNEGOT)");
                close (parport_fd);
                return 1;
        }

        {
                static unsigned char mask = PARPORT_CONTROL_STROBE;
                printf("Setting null mask to control pins (strobe,etc.)...\n");
                if(ioctl(parport_fd, PPWCONTROL, &mask)) {
                        perror("null mask");
                        close(parport_fd);
                        return 1;
                }
        }

        ioctl(parport_fd, PPRELEASE);
        close(parport_fd);
        return 0;
}