FreeCalypso > hg > freecalypso-tools

annotate miscutil/fc-pulse-dtr.c @ 926:6a0aa8d36d06

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rvinterf backslash escape: introduce libprint The new helper function library named libprint is meant to replace the badly misnamed libg23, and will soon contain functions for printing all of the same kinds of GPF TST packets that are now handled in libg23. However, we are also moving safe_print_trace() from libasync to this new library, and changing it to emit our new backslash escape format.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 23 May 2023 03:47:46 +0000
parents 5b8287c655cf
children
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5b8287c655cf fc-pulse-dtr and fc-pulse-rts utilities implemented
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1 /*
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2 * This utility opens a serial port, asserts DTR for 50 ms, then negates it
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3 * and exits. It is intended for use with FreeCalypso DUART28C adapters.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <sys/file.h>
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8 #include <sys/ioctl.h>
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11 #include <unistd.h>
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12
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13 main(argc, argv)
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14 char **argv;
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15 {
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16 int target_fd;
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17 int mctl_arg = TIOCM_DTR;
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18
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19 if (argc != 2) {
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20 fprintf(stderr, "usage: %s ttyname\n", argv[0]);
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21 exit(1);
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22 }
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23 target_fd = open(argv[1], O_RDWR|O_NONBLOCK);
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24 if (target_fd < 0) {
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25 perror(argv[1]);
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26 exit(1);
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27 }
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28 ioctl(target_fd, TIOCMBIS, &mctl_arg);
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29 usleep(50000);
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30 ioctl(target_fd, TIOCMBIC, &mctl_arg);
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31 exit(0);
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32 }