aciona.led.c

/**
    Copyright (C) 2014  Samir C. Costa <[email protected]>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdio.h>
#include <sys/io.h>
int main(int argc, char **argv)
{
	if(getuid() != 0) {
      printf("You must be root to run this app.\n");
      return 1;
    }
    if(argc < 2) {
      printf("Usage: %s [interval]\nInterval in microseconds.\n", argv[0]);
      return 1;
    }
    int interval = atoi(argv[1]);
    ioperm(0x378,3,1);
    while(1) {
      outb(0xff, 0x378);
      usleep(interval);
      outb(0x00, 0x378);
      usleep(interval);
    }
    return 0;
}