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comparison miscutil/fc-pulse-dtr.c @ 735:5b8287c655cf

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fc-pulse-dtr and fc-pulse-rts utilities implemented
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 15 Sep 2020 04:29:43 +0000
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734:23f41a61ff7a 735:5b8287c655cf
1 /*
2 * This utility opens a serial port, asserts DTR for 50 ms, then negates it
3 * and exits. It is intended for use with FreeCalypso DUART28C adapters.
4 */
5
6 #include <sys/types.h>
7 #include <sys/file.h>
8 #include <sys/ioctl.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <unistd.h>
12
13 main(argc, argv)
14 char **argv;
15 {
16 int target_fd;
17 int mctl_arg = TIOCM_DTR;
18
19 if (argc != 2) {
20 fprintf(stderr, "usage: %s ttyname\n", argv[0]);
21 exit(1);
22 }
23 target_fd = open(argv[1], O_RDWR|O_NONBLOCK);
24 if (target_fd < 0) {
25 perror(argv[1]);
26 exit(1);
27 }
28 ioctl(target_fd, TIOCMBIS, &mctl_arg);
29 usleep(50000);
30 ioctl(target_fd, TIOCMBIC, &mctl_arg);
31 exit(0);
32 }