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annotate serial/serport.c @ 102:c2f18d7b0a1e

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doc/Admin-write-commands: document write-hplmn-timer command
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 14 May 2022 23:20:38 +0000
parents fbedb67d234f
children
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61a8ac93764f serial/serport.c: add important explanatory comment
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1 /*
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2 * This module implements the guts of OS-specific serial port handling
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3 * for our fc-sim-tools serial back end. The present version is very
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4 * Linux-specific, using Linux-specific <asm/...> header files,
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5 * struct termios2 and BOTHER to request arbitrary serial baud rates
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6 * outside of POSIX Bxxx rigid set.
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7 */
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8
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9 #include <sys/types.h>
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10 #include <sys/file.h>
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11 #include <sys/ioctl.h>
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12 #include <asm/ioctls.h>
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13 #include <asm/termbits.h>
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14 #include <stdio.h>
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15 #include <stdlib.h>
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16 #include <unistd.h>
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17
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18 int target_fd;
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19
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20 open_serial_port(ttyport)
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21 char *ttyport;
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22 {
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23 target_fd = open(ttyport, O_RDWR|O_NONBLOCK);
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24 if (target_fd < 0) {
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25 perror(ttyport);
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26 exit(1);
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27 }
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28 ioctl(target_fd, TIOCEXCL);
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29 return 0;
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30 }
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31
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32 set_serial_params(bps, parity)
38
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33 {
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34 struct termios2 target_termios;
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35
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36 target_termios.c_iflag = IGNBRK|IGNPAR;
38
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37 target_termios.c_oflag = 0;
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38 target_termios.c_cflag = BOTHER|CLOCAL|HUPCL|CREAD|CS8|CSTOPB|PARENB;
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39 if (parity == 1)
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40 target_termios.c_cflag |= PARODD;
38
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41 target_termios.c_lflag = 0;
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42 target_termios.c_cc[VMIN] = 1;
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43 target_termios.c_cc[VTIME] = 0;
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44 target_termios.c_ispeed = bps;
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45 target_termios.c_ospeed = bps;
38
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46 if (ioctl(target_fd, TCSETSF2, &target_termios) < 0) {
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47 perror("TCSETSF2");
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48 exit(1);
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49 }
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50 return 0;
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51 }
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52
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53 set_serial_nonblock(state)
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54 int state;
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55 {
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56 ioctl(target_fd, FIONBIO, &state);
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57 }
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58
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59 serial_card_reset()
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60 {
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61 int mctl_arg = TIOCM_DTR | TIOCM_RTS;
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62
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63 ioctl(target_fd, TIOCMBIS, &mctl_arg);
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64 usleep(20000);
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65 ioctl(target_fd, TCFLSH, TCIFLUSH);
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66 ioctl(target_fd, TIOCMBIC, &mctl_arg);
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67 }