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annotate libpwon/duart28c.c @ 904:5041bcb8140f

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tchtools/fc-vm2hex.c: update header comment for new situation
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 28 Dec 2022 08:41:57 +0000
parents 7d1df6d831e4
children
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7d1df6d831e4 libpwon: added -Pdtr and -Prts support for DUART28C
Mychaela Falconia <falcon@freecalypso.org>
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1 #include <sys/types.h>
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2 #include <sys/ioctl.h>
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3 #include <stdio.h>
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4 #include <stdlib.h>
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5 #include <string.h>
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6 #include <strings.h>
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7 #include <unistd.h>
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8
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9 extern int target_fd;
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10
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11 int bootctrl_duart28c_mode;
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12 static int mctl_arg;
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13
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14 bootctrl_check_duart28c(bc_name)
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15 char *bc_name;
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16 {
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17 if (!strcmp(bc_name, "dtr")) {
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18 bootctrl_duart28c_mode = 1;
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19 mctl_arg = TIOCM_DTR;
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20 return 1;
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21 }
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22 if (!strcmp(bc_name, "rts")) {
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23 bootctrl_duart28c_mode = 1;
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24 mctl_arg = TIOCM_RTS;
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25 return 1;
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26 }
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27 return 0;
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28 }
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29
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30 void
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31 fork_duart28c_pulse()
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32 {
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33 int i;
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34
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35 i = fork();
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36 if (i < 0) {
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37 perror("fork");
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38 exit(1);
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39 }
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40 if (i)
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41 return;
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42 ioctl(target_fd, TIOCMBIS, &mctl_arg);
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43 usleep(50000);
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44 ioctl(target_fd, TIOCMBIC, &mctl_arg);
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45 exit(0);
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46 }