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annotate cmu200/sercmd.c @ 0:bd62be88259d

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initial import of rfcal code and docs from freecalypso-tools repository
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 20 May 2017 18:49:35 +0000
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children aeffe53e110d
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bd62be88259d initial import of rfcal code and docs from freecalypso-tools repository
Mychaela Falconia <falcon@freecalypso.org>
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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 printf("Command to CMU: %s", cmd);
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22 write(target_fd, cmd, strlen(cmd));
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23 }
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24
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25 collect_instr_response()
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26 {
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27 char buf[BUFSIZ];
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28 int cc, pos;
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29
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30 for (pos = 0; ; ) {
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31 cc = read(target_fd, buf, sizeof buf);
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32 if (cc <= 0) {
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33 perror("error reading from serial port");
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34 exit(1);
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35 }
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36 if (pos + cc > sizeof instrument_response) {
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37 fprintf(stderr,
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38 "error: response from CMU200 exceeds our buffer size\n");
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39 exit(1);
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40 }
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41 bcopy(buf, instrument_response + pos, cc);
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42 pos += cc;
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43 if (instrument_response[pos-1] == '\n')
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44 break;
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45 }
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46 instrument_response[pos-1] = '\0';
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47 printf("Instrument response: %s\n", instrument_response);
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48 }
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49
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50 collect_staropc_response()
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51 {
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52 collect_instr_response();
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53 if (instrument_response[0] != '1' ||
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54 instrument_response[1] && !isspace(instrument_response[1])) {
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55 fprintf(stderr, "error: unexpected response to *OPC?\n");
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56 exit(1);
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57 }
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58 }