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comparison rfcal/cmu200/sercmd.c @ 194:31d43f0e469a

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fc-cmu200d skeleton started, compiles
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 24 Apr 2017 00:45:54 +0000
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193:a57c93cf7f5c 194:31d43f0e469a
1 /*
2 * This module contains the functions that send serial commands to the CMU200
3 * and collect the instrument's serial responses.
4 */
5
6 #include <sys/types.h>
7 #include <ctype.h>
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <unistd.h>
11 #include <string.h>
12 #include <strings.h>
13
14 extern int target_fd;
15
16 char instrument_response[4096];
17
18 send_scpi_cmd(cmd)
19 char *cmd;
20 {
21 printf("Command to CMU: %s", cmd);
22 write(target_fd, cmd, strlen(cmd));
23 }
24
25 collect_instr_response()
26 {
27 char buf[BUFSIZ];
28 int cc, pos;
29
30 for (pos = 0; ; ) {
31 cc = read(target_fd, buf, sizeof buf);
32 if (cc <= 0) {
33 perror("error reading from serial port");
34 exit(1);
35 }
36 if (pos + cc > sizeof instrument_response) {
37 fprintf(stderr,
38 "error: response from CMU200 exceeds our buffer size\n");
39 exit(1);
40 }
41 bcopy(buf, instrument_response + pos, cc);
42 pos += cc;
43 if (instrument_response[pos-1] == '\n')
44 break;
45 }
46 instrument_response[pos-1] = '\0';
47 printf("Instrument response: %s\n", instrument_response);
48 }
49
50 collect_staropc_response()
51 {
52 collect_instr_response();
53 if (instrument_response[0] != '1' ||
54 instrument_response[1] && !isspace(instrument_response[1])) {
55 fprintf(stderr, "error: unexpected response to *OPC?\n");
56 exit(1);
57 }
58 }