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annotate rfcal/cmu200/sertool.c @ 189:425f16556e69

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doc/CMU200-notes started
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 23 Apr 2017 16:42:43 +0000
parents 219ae678b955
children
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187
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1 /*
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2 * This module contains the main() function for fc-serscpi, a manual tool
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3 * intended for learning how to control the CMU200 with SCPI commands
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4 * over RS-232.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <sys/errno.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 #include <strings.h>
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13
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14 extern int errno;
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15
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16 int target_fd;
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17
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18 static void
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19 safe_output(buf, cc)
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20 u_char *buf;
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21 {
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22 int i, c;
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23
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24 for (i = 0; i < cc; i++) {
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25 c = buf[i];
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26 if (c == '\r' || c == '\n' || c == '\t' || c == '\b') {
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27 putchar(c);
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28 continue;
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29 }
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30 if (c & 0x80) {
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31 putchar('M');
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32 putchar('-');
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33 c &= 0x7F;
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34 }
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35 if (c < 0x20) {
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36 putchar('^');
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37 putchar(c + '@');
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38 } else if (c == 0x7F) {
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39 putchar('^');
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40 putchar('?');
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41 } else
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42 putchar(c);
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43 }
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44 fflush(stdout);
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45 }
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46
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47 main(argc, argv)
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48 char **argv;
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49 {
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50 char buf[BUFSIZ];
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51 fd_set fds, fds1;
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52 register int i, cc, max;
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53
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54 if (argc != 3) {
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55 fprintf(stderr, "usage: %s ttyname baudrate\n", argv[0]);
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56 exit(1);
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57 }
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58 open_target_serial(argv[1], argv[2]);
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59 set_serial_nonblock(0);
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60 FD_ZERO(&fds);
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61 FD_SET(0, &fds);
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62 FD_SET(target_fd, &fds);
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63 max = target_fd + 1;
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64 for (;;) {
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65 bcopy(&fds, &fds1, sizeof(fd_set));
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66 i = select(max, &fds1, NULL, NULL, NULL);
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67 if (i < 0) {
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68 if (errno == EINTR)
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69 continue;
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70 perror("select");
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71 exit(1);
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72 }
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73 if (FD_ISSET(0, &fds1)) {
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74 cc = read(0, buf, sizeof buf);
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75 if (cc <= 0)
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76 exit(0);
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77 write(target_fd, buf, cc);
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78 }
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79 if (FD_ISSET(target_fd, &fds1)) {
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80 cc = read(target_fd, buf, sizeof buf);
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81 if (cc <= 0) {
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82 fprintf(stderr, "EOF/error on target tty\n");
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83 exit(1);
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84 }
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85 safe_output(buf, cc);
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86 }
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87 }
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88 }