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annotate cmu200/sercmd.c @ 34:99f753d4ccaf

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fc-cmu200d: check for errors on serial port write
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 23 May 2017 00:33:10 +0000
parents aeffe53e110d
children
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1 /*
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2 * This module contains the functions that send serial commands to the CMU200
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3 * and collect the instrument's serial responses.
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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 <ctype.h>
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8 #include <stdio.h>
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9 #include <stdlib.h>
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10 #include <unistd.h>
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11 #include <string.h>
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12 #include <strings.h>
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13
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14 extern int target_fd;
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15
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16 char instrument_response[4096];
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17
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18 send_scpi_cmd(cmd)
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19 char *cmd;
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20 {
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21 int cc, len;
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22
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23 printf("Command to CMU: %s", cmd);
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24 len = strlen(cmd);
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25 cc = write(target_fd, cmd, len);
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26 if (cc != len) {
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27 perror("serial port write error");
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28 exit(1);
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29 }
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30 }
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32 collect_instr_response()
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33 {
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34 char buf[BUFSIZ];
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35 int cc, pos;
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36
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37 for (pos = 0; ; ) {
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38 cc = read(target_fd, buf, sizeof buf);
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39 if (cc <= 0) {
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40 perror("error reading from serial port");
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41 exit(1);
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42 }
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43 if (pos + cc > sizeof instrument_response) {
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44 fprintf(stderr,
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45 "error: response from CMU200 exceeds our buffer size\n");
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46 exit(1);
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47 }
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48 bcopy(buf, instrument_response + pos, cc);
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49 pos += cc;
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50 if (instrument_response[pos-1] == '\n')
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51 break;
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52 }
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53 instrument_response[pos-1] = '\0';
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54 if (pos >= 2 && instrument_response[pos-2] == '\r')
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55 instrument_response[pos-2] = '\0';
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56 printf("Instrument response: %s\n", instrument_response);
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57 }
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58
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59 collect_staropc_response()
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60 {
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61 collect_instr_response();
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62 if (instrument_response[0] != '1' || instrument_response[1]) {
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63 fprintf(stderr, "error: unexpected response to *OPC?\n");
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64 exit(1);
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65 }
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66 }
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68 parse_commasep_response(argv, expect_count)
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69 char **argv;
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70 {
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71 char *cp, *sp;
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72 int i;
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73
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74 cp = instrument_response;
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75 for (i = 0; i < expect_count - 1; i++) {
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76 argv[i] = cp;
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77 sp = index(cp, ',');
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78 if (!sp)
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79 return(-1);
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80 *sp = '\0';
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81 cp = sp + 1;
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82 }
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83 argv[i] = cp;
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84 if (index(cp, ','))
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85 return(-1);
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86 return(0);
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87 }