//
// sqr.c
//


#include <stdio.h>
#include <fcntl.h>
#include <time.h>
#include "lpv.h"


void main(){


int fd;
short number = 0x1111;
unsigned char buffer;


struct timespec tiempo;


tiempo.tv_sec = 0;
tiempo.tv_nsec = 1 * 1000000;


fd = open("/dev/lpv",O_RDWR); [ See NOTE ]
if (fd<0) {
perror("Could not open");
exit(-1);
}


while(1){


write(fd,"1",1);
nanosleep(&tiempo,NULL);
write(fd,"2",1);
nanosleep(&tiempo,NULL);


}


close(fd);


}


[ NOTE ]
/dev/lpv is a very simple parallel port driver.
See code.