FreeCalypso > hg > freecalypso-tools

annotate miscutil/fc-pulse-dtr.c @ 924:d452188587b4

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rvinterf: begin change to backslash escape output format Right now throughout the rvinterf suite, any time we emit output that is expected to be ASCII, but may contain non-printable garbage, we use 'cat -v' form of garbage character representation. Unfortunately, this transformation is lossy (can't be reversed 100% reliably in the user's wetware), hence we would like to migrate to C-style backslash escapes, including doubling of any already-present backslashes - this escape mechanism is lossless. Begin this change by converting the output of RV and L1 traces in rvinterf and rvtdump.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 23 May 2023 03:10:50 +0000
parents 5b8287c655cf
children
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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 }