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/*
* spreadspace avr utils
*
*
* Copyright (C) 2012 Christian Pointner <equinox@spreadspace.org>
*
* This file is part of spreadspace avr utils.
*
* spreadspace avr utils 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
* any later version.
*
* spreadspace avr utils 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 spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <termios.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <time.h>
#include <stdio.h>
#include <sys/select.h>
#define STATE_OFF 0
#define STATE_ON 1
void setDTRState (int fd, int state) {
int flags;
ioctl(fd, TIOCMGET, &flags);
flags = (state == STATE_ON ? flags | TIOCM_DTR : flags & ~TIOCM_DTR);
ioctl(fd, TIOCMSET, &flags);
}
int
main(int argc, char* argv[])
{
char* device = argc < 2 ? "/dev/ttyUSB0" : argv[1];
int fd = open(device, O_RDWR);
if (fd == 0) {
fprintf(stderr, "Could not open %s\n", device);
return EXIT_FAILURE;
}
setDTRState(fd, STATE_ON);
struct timeval sleeptime = {0, 100000}; // 100ms
select(0, NULL, NULL, NULL, &sleeptime);
setDTRState(fd, STATE_OFF);
sleeptime.tv_sec = 0;
sleeptime.tv_usec = 100000;
select(0, NULL, NULL, NULL, &sleeptime);
setDTRState(fd, STATE_ON);
close(fd);
return EXIT_SUCCESS;
}
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