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/*
alle datenpins der reihe nach setzen via parport
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
#include <linux/parport.h>
#include <linux/ppdev.h>
#define DEVICE "/dev/parport0"
static char *RCSID __attribute__ ((unused)) =
"$Id: ppraider.c,v 1.1 2006/03/19 15:33:54 walter Exp walter $";
#define SHOW(st,bits) printf(#bits" %s\n", ( st & bits) ?"on":"off")
int xopenport(char *name, int fdmode)
{
static int fd;
int mode;
mode = O_WRONLY | O_NOCTTY;
fd = open(name, mode);
if (fd == -1) {
perror("open");
exit(EXIT_FAILURE);
}
if (ioctl(fd, PPCLAIM)) {
perror("PPCLAIM");
close(fd);
exit(EXIT_FAILURE);
}
mode = IEEE1284_MODE_COMPAT;
if (ioctl(fd, PPNEGOT, &mode)) {
perror("PPNEGOT");
close(fd);
exit(EXIT_FAILURE);
}
return fd;
}
/* release port close(fd), ignore errors */
void xcloseport(int fd)
{
ioctl(fd, PPRELEASE);
close(fd);
}
void xset_data(int fd, int data)
{
int ret;
ret = ioctl(fd, PPWDATA, &data);
if (!ret)
return;
fprintf(stderr, "%s failed:%s\n", __func__, strerror(errno));
exit(EXIT_FAILURE);
}
/* get status info */
/* clean up later */
void xget_status(int fd, unsigned char *foo)
{
int ret;
unsigned char status;
ret = ioctl(fd, PPRSTATUS, &status);
if (!ret) {
*foo = status;
return;
}
fprintf(stderr, "%s failed:%s\n", __func__, strerror(errno));
exit(EXIT_FAILURE);
}
int main()
{
int i,fd;
fd = xopenport(DEVICE, 0);
for (i = 0; i < 8; i++) {
xset_data(fd, 1 << i);
usleep(500000);
}
xset_data(fd, 0);
xcloseport(fd);
return 0;
}
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