2 * This file is part of the libsigrok project.
4 * Copyright (C) 2013 poljar (Damir Jelić) <poljarinho@gmail.com>
5 * Copyright (C) 2015 Bert Vermeulen <bert@biot.com>
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include <libsigrok/libsigrok.h>
25 #include "libsigrok-internal.h"
28 #define LOG_PREFIX "scpi"
30 #define SCPI_READ_RETRIES 100
31 #define SCPI_READ_RETRY_TIMEOUT_US (10 * 1000)
33 static const char *scpi_vendors[][2] = {
34 { "HEWLETT-PACKARD", "HP" },
35 { "Agilent Technologies", "Agilent" },
36 { "Keysight Technologies", "Keysight" },
37 { "RIGOL TECHNOLOGIES", "Rigol" },
38 { "PHILIPS", "Philips" },
39 { "CHROMA", "Chroma" },
40 { "Chroma ATE", "Chroma" },
44 * Parse a string representation of a boolean-like value into a gboolean.
45 * Similar to sr_parse_boolstring but rejects strings which do not represent
46 * a boolean-like value.
48 * @param str String to convert.
49 * @param ret Pointer to a gboolean where the result of the conversion will be
52 * @return SR_OK on success, SR_ERR on failure.
54 static int parse_strict_bool(const char *str, gboolean *ret)
59 if (!g_strcmp0(str, "1") ||
60 !g_ascii_strncasecmp(str, "y", 1) ||
61 !g_ascii_strncasecmp(str, "t", 1) ||
62 !g_ascii_strncasecmp(str, "yes", 3) ||
63 !g_ascii_strncasecmp(str, "true", 4) ||
64 !g_ascii_strncasecmp(str, "on", 2)) {
67 } else if (!g_strcmp0(str, "0") ||
68 !g_ascii_strncasecmp(str, "n", 1) ||
69 !g_ascii_strncasecmp(str, "f", 1) ||
70 !g_ascii_strncasecmp(str, "no", 2) ||
71 !g_ascii_strncasecmp(str, "false", 5) ||
72 !g_ascii_strncasecmp(str, "off", 3)) {
80 SR_PRIV extern const struct sr_scpi_dev_inst scpi_serial_dev;
81 SR_PRIV extern const struct sr_scpi_dev_inst scpi_tcp_raw_dev;
82 SR_PRIV extern const struct sr_scpi_dev_inst scpi_tcp_rigol_dev;
83 SR_PRIV extern const struct sr_scpi_dev_inst scpi_usbtmc_libusb_dev;
84 SR_PRIV extern const struct sr_scpi_dev_inst scpi_vxi_dev;
85 SR_PRIV extern const struct sr_scpi_dev_inst scpi_visa_dev;
86 SR_PRIV extern const struct sr_scpi_dev_inst scpi_libgpib_dev;
88 static const struct sr_scpi_dev_inst *scpi_devs[] = {
91 #ifdef HAVE_LIBUSB_1_0
92 &scpi_usbtmc_libusb_dev,
103 #ifdef HAVE_LIBSERIALPORT
104 &scpi_serial_dev, /* Must be last as it matches any resource. */
108 static struct sr_dev_inst *sr_scpi_scan_resource(struct drv_context *drvc,
109 const char *resource, const char *serialcomm,
110 struct sr_dev_inst *(*probe_device)(struct sr_scpi_dev_inst *scpi))
112 struct sr_scpi_dev_inst *scpi;
113 struct sr_dev_inst *sdi;
115 if (!(scpi = scpi_dev_inst_new(drvc, resource, serialcomm)))
118 if (sr_scpi_open(scpi) != SR_OK) {
119 sr_info("Couldn't open SCPI device.");
124 sdi = probe_device(scpi);
129 sdi->status = SR_ST_INACTIVE;
137 * Send a SCPI command with a variadic argument list without mutex.
139 * @param scpi Previously initialized SCPI device structure.
140 * @param format Format string.
141 * @param args Argument list.
143 * @return SR_OK on success, SR_ERR on failure.
145 static int scpi_send_variadic(struct sr_scpi_dev_inst *scpi,
146 const char *format, va_list args)
152 /* Get length of buffer required. */
153 va_copy(args_copy, args);
154 len = sr_vsnprintf_ascii(NULL, 0, format, args_copy);
157 /* Allocate buffer and write out command. */
158 buf = g_malloc0(len + 2);
159 sr_vsprintf_ascii(buf, format, args);
160 if (buf[len - 1] != '\n')
164 ret = scpi->send(scpi->priv, buf);
166 /* Free command buffer. */
173 * Send a SCPI command without mutex.
175 * @param scpi Previously initialized SCPI device structure.
176 * @param format Format string, to be followed by any necessary arguments.
178 * @return SR_OK on success, SR_ERR on failure.
180 static int scpi_send(struct sr_scpi_dev_inst *scpi, const char *format, ...)
185 va_start(args, format);
186 ret = scpi_send_variadic(scpi, format, args);
193 * Send data to SCPI device without mutex.
195 * TODO: This is only implemented in TcpRaw, but never used.
196 * TODO: Use Mutex at all?
198 * @param scpi Previously initialised SCPI device structure.
199 * @param buf Buffer with data to send.
200 * @param len Number of bytes to send.
202 * @return Number of bytes read, or SR_ERR upon failure.
204 static int scpi_write_data(struct sr_scpi_dev_inst *scpi, char *buf, int maxlen)
206 return scpi->write_data(scpi->priv, buf, maxlen);
210 * Read part of a response from SCPI device without mutex.
212 * @param scpi Previously initialised SCPI device structure.
213 * @param buf Buffer to store result.
214 * @param maxlen Maximum number of bytes to read.
216 * @return Number of bytes read, or SR_ERR upon failure.
218 static int scpi_read_data(struct sr_scpi_dev_inst *scpi, char *buf, int maxlen)
220 return scpi->read_data(scpi->priv, buf, maxlen);
224 * Do a non-blocking read of up to the allocated length, and
225 * check if a timeout has occured, without mutex.
227 * @param scpi Previously initialised SCPI device structure.
228 * @param response Buffer to which the response is appended.
229 * @param abs_timeout_us Absolute timeout in microseconds
231 * @return read length on success, SR_ERR* on failure.
233 static int scpi_read_response(struct sr_scpi_dev_inst *scpi,
234 GString *response, gint64 abs_timeout_us)
238 space = response->allocated_len - response->len;
239 len = scpi->read_data(scpi->priv, &response->str[response->len], space);
242 sr_err("Incompletely read SCPI response.");
247 g_string_set_size(response, response->len + len);
251 if (g_get_monotonic_time() > abs_timeout_us) {
252 sr_err("Timed out waiting for SCPI response.");
253 return SR_ERR_TIMEOUT;
260 * Send a SCPI command, receive the reply and store the reply in
261 * scpi_response, without mutex.
263 * @param scpi Previously initialised SCPI device structure.
264 * @param command The SCPI command to send to the device.
265 * @param scpi_response Pointer where to store the SCPI response.
267 * @return SR_OK on success, SR_ERR on failure.
269 static int scpi_get_data(struct sr_scpi_dev_inst *scpi,
270 const char *command, GString **scpi_response)
277 /* Optionally send caller provided command. */
279 if (scpi_send(scpi, command) != SR_OK)
283 /* Initiate SCPI read operation. */
284 if (sr_scpi_read_begin(scpi) != SR_OK)
287 /* Keep reading until completion or until timeout. */
288 timeout = g_get_monotonic_time() + scpi->read_timeout_us;
290 response = *scpi_response;
292 while (!sr_scpi_read_complete(scpi)) {
293 /* Resize the buffer when free space drops below a threshold. */
294 space = response->allocated_len - response->len;
296 int oldlen = response->len;
297 g_string_set_size(response, oldlen + 1024);
298 g_string_set_size(response, oldlen);
301 /* Read another chunk of the response. */
302 ret = scpi_read_response(scpi, response, timeout);
307 timeout = g_get_monotonic_time() + scpi->read_timeout_us;
313 SR_PRIV GSList *sr_scpi_scan(struct drv_context *drvc, GSList *options,
314 struct sr_dev_inst *(*probe_device)(struct sr_scpi_dev_inst *scpi))
316 GSList *resources, *l, *devices;
317 struct sr_dev_inst *sdi;
318 const char *resource = NULL;
319 const char *serialcomm = NULL;
323 for (l = options; l; l = l->next) {
324 struct sr_config *src = l->data;
327 resource = g_variant_get_string(src->data, NULL);
329 case SR_CONF_SERIALCOMM:
330 serialcomm = g_variant_get_string(src->data, NULL);
336 for (i = 0; i < ARRAY_SIZE(scpi_devs); i++) {
337 if ((resource && strcmp(resource, scpi_devs[i]->prefix))
338 || !scpi_devs[i]->scan)
340 resources = scpi_devs[i]->scan(drvc);
341 for (l = resources; l; l = l->next) {
342 res = g_strsplit(l->data, ":", 2);
343 if (res[0] && (sdi = sr_scpi_scan_resource(drvc, res[0],
344 serialcomm ? serialcomm : res[1], probe_device))) {
345 devices = g_slist_append(devices, sdi);
346 sdi->connection_id = g_strdup(l->data);
350 g_slist_free_full(resources, g_free);
353 if (!devices && resource) {
354 sdi = sr_scpi_scan_resource(drvc, resource, serialcomm, probe_device);
356 devices = g_slist_append(NULL, sdi);
359 /* Tack a copy of the newly found devices onto the driver list. */
361 drvc->instances = g_slist_concat(drvc->instances, g_slist_copy(devices));
366 SR_PRIV struct sr_scpi_dev_inst *scpi_dev_inst_new(struct drv_context *drvc,
367 const char *resource, const char *serialcomm)
369 struct sr_scpi_dev_inst *scpi = NULL;
370 const struct sr_scpi_dev_inst *scpi_dev;
374 for (i = 0; i < ARRAY_SIZE(scpi_devs); i++) {
375 scpi_dev = scpi_devs[i];
376 if (!strncmp(resource, scpi_dev->prefix, strlen(scpi_dev->prefix))) {
377 sr_dbg("Opening %s device %s.", scpi_dev->name, resource);
378 scpi = g_malloc(sizeof(*scpi));
380 scpi->priv = g_malloc0(scpi->priv_size);
381 scpi->read_timeout_us = 1000 * 1000;
382 params = g_strsplit(resource, "/", 0);
383 if (scpi->dev_inst_new(scpi->priv, drvc, resource,
384 params, serialcomm) != SR_OK) {
399 * @param scpi Previously initialized SCPI device structure.
401 * @return SR_OK on success, SR_ERR on failure.
403 SR_PRIV int sr_scpi_open(struct sr_scpi_dev_inst *scpi)
405 g_mutex_init(&scpi->scpi_mutex);
407 return scpi->open(scpi);
411 * Add an event source for an SCPI device.
413 * @param session The session to add the event source to.
414 * @param scpi Previously initialized SCPI device structure.
415 * @param events Events to check for.
416 * @param timeout Max time to wait before the callback is called, ignored if 0.
417 * @param cb Callback function to add. Must not be NULL.
418 * @param cb_data Data for the callback function. Can be NULL.
420 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or
421 * SR_ERR_MALLOC upon memory allocation errors.
423 SR_PRIV int sr_scpi_source_add(struct sr_session *session,
424 struct sr_scpi_dev_inst *scpi, int events, int timeout,
425 sr_receive_data_callback cb, void *cb_data)
427 return scpi->source_add(session, scpi->priv, events, timeout, cb, cb_data);
431 * Remove event source for an SCPI device.
433 * @param session The session to remove the event source from.
434 * @param scpi Previously initialized SCPI device structure.
436 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or
437 * SR_ERR_MALLOC upon memory allocation errors, SR_ERR_BUG upon
440 SR_PRIV int sr_scpi_source_remove(struct sr_session *session,
441 struct sr_scpi_dev_inst *scpi)
443 return scpi->source_remove(session, scpi->priv);
447 * Send a SCPI command.
449 * @param scpi Previously initialized SCPI device structure.
450 * @param format Format string, to be followed by any necessary arguments.
452 * @return SR_OK on success, SR_ERR on failure.
454 SR_PRIV int sr_scpi_send(struct sr_scpi_dev_inst *scpi,
455 const char *format, ...)
460 va_start(args, format);
461 g_mutex_lock(&scpi->scpi_mutex);
462 ret = scpi_send_variadic(scpi, format, args);
463 g_mutex_unlock(&scpi->scpi_mutex);
470 * Send a SCPI command with a variadic argument list.
472 * @param scpi Previously initialized SCPI device structure.
473 * @param format Format string.
474 * @param args Argument list.
476 * @return SR_OK on success, SR_ERR on failure.
478 SR_PRIV int sr_scpi_send_variadic(struct sr_scpi_dev_inst *scpi,
479 const char *format, va_list args)
483 g_mutex_lock(&scpi->scpi_mutex);
484 ret = scpi_send_variadic(scpi, format, args);
485 g_mutex_unlock(&scpi->scpi_mutex);
491 * Begin receiving an SCPI reply.
493 * @param scpi Previously initialised SCPI device structure.
495 * @return SR_OK on success, SR_ERR on failure.
497 SR_PRIV int sr_scpi_read_begin(struct sr_scpi_dev_inst *scpi)
499 return scpi->read_begin(scpi->priv);
503 * Read part of a response from SCPI device.
505 * @param scpi Previously initialised SCPI device structure.
506 * @param buf Buffer to store result.
507 * @param maxlen Maximum number of bytes to read.
509 * @return Number of bytes read, or SR_ERR upon failure.
511 SR_PRIV int sr_scpi_read_data(struct sr_scpi_dev_inst *scpi,
512 char *buf, int maxlen)
516 g_mutex_lock(&scpi->scpi_mutex);
517 ret = scpi_read_data(scpi, buf, maxlen);
518 g_mutex_unlock(&scpi->scpi_mutex);
524 * Send data to SCPI device.
526 * TODO: This is only implemented in TcpRaw, but never used.
527 * TODO: Use Mutex at all?
529 * @param scpi Previously initialised SCPI device structure.
530 * @param buf Buffer with data to send.
531 * @param len Number of bytes to send.
533 * @return Number of bytes read, or SR_ERR upon failure.
535 SR_PRIV int sr_scpi_write_data(struct sr_scpi_dev_inst *scpi,
536 char *buf, int maxlen)
540 g_mutex_lock(&scpi->scpi_mutex);
541 ret = scpi_write_data(scpi, buf, maxlen);
542 g_mutex_unlock(&scpi->scpi_mutex);
548 * Check whether a complete SCPI response has been received.
550 * @param scpi Previously initialised SCPI device structure.
552 * @return 1 if complete, 0 otherwise.
554 SR_PRIV int sr_scpi_read_complete(struct sr_scpi_dev_inst *scpi)
556 return scpi->read_complete(scpi->priv);
562 * @param scpi Previously initialized SCPI device structure.
564 * @return SR_OK on success, SR_ERR on failure.
566 SR_PRIV int sr_scpi_close(struct sr_scpi_dev_inst *scpi)
570 g_mutex_lock(&scpi->scpi_mutex);
571 ret = scpi->close(scpi);
572 g_mutex_unlock(&scpi->scpi_mutex);
573 g_mutex_clear(&scpi->scpi_mutex);
581 * @param scpi Previously initialized SCPI device structure. If NULL,
582 * this function does nothing.
584 SR_PRIV void sr_scpi_free(struct sr_scpi_dev_inst *scpi)
589 scpi->free(scpi->priv);
591 g_free(scpi->actual_channel_name);
596 * Send a SCPI command, receive the reply and store the reply in scpi_response.
598 * @param scpi Previously initialised SCPI device structure.
599 * @param command The SCPI command to send to the device (can be NULL).
600 * @param scpi_response Pointer where to store the SCPI response.
602 * @return SR_OK on success, SR_ERR* on failure.
604 SR_PRIV int sr_scpi_get_string(struct sr_scpi_dev_inst *scpi,
605 const char *command, char **scpi_response)
608 response = g_string_sized_new(1024);
610 if (sr_scpi_get_data(scpi, command, &response) != SR_OK) {
612 g_string_free(response, TRUE);
616 /* Get rid of trailing linefeed if present */
617 if (response->len >= 1 && response->str[response->len - 1] == '\n')
618 g_string_truncate(response, response->len - 1);
620 /* Get rid of trailing carriage return if present */
621 if (response->len >= 1 && response->str[response->len - 1] == '\r')
622 g_string_truncate(response, response->len - 1);
624 sr_spew("Got response: '%.70s', length %" G_GSIZE_FORMAT ".",
625 response->str, response->len);
627 *scpi_response = g_string_free(response, FALSE);
633 * Do a non-blocking read of up to the allocated length, and
634 * check if a timeout has occured.
636 * @param scpi Previously initialised SCPI device structure.
637 * @param response Buffer to which the response is appended.
638 * @param abs_timeout_us Absolute timeout in microseconds
640 * @return read length on success, SR_ERR* on failure.
642 SR_PRIV int sr_scpi_read_response(struct sr_scpi_dev_inst *scpi,
643 GString *response, gint64 abs_timeout_us)
647 g_mutex_lock(&scpi->scpi_mutex);
648 ret = scpi_read_response(scpi, response, abs_timeout_us);
649 g_mutex_unlock(&scpi->scpi_mutex);
654 SR_PRIV int sr_scpi_get_data(struct sr_scpi_dev_inst *scpi,
655 const char *command, GString **scpi_response)
659 g_mutex_lock(&scpi->scpi_mutex);
660 ret = scpi_get_data(scpi, command, scpi_response);
661 g_mutex_unlock(&scpi->scpi_mutex);
667 * Send a SCPI command, read the reply, parse it as a bool value and store the
668 * result in scpi_response.
670 * @param scpi Previously initialised SCPI device structure.
671 * @param command The SCPI command to send to the device (can be NULL).
672 * @param scpi_response Pointer where to store the parsed result.
674 * @return SR_OK on success, SR_ERR* on failure.
676 SR_PRIV int sr_scpi_get_bool(struct sr_scpi_dev_inst *scpi,
677 const char *command, gboolean *scpi_response)
684 ret = sr_scpi_get_string(scpi, command, &response);
685 if (ret != SR_OK && !response)
688 if (parse_strict_bool(response, scpi_response) == SR_OK)
699 * Send a SCPI command, read the reply, parse it as an integer and store the
700 * result in scpi_response.
702 * @param scpi Previously initialised SCPI device structure.
703 * @param command The SCPI command to send to the device (can be NULL).
704 * @param scpi_response Pointer where to store the parsed result.
706 * @return SR_OK on success, SR_ERR* on failure.
708 SR_PRIV int sr_scpi_get_int(struct sr_scpi_dev_inst *scpi,
709 const char *command, int *scpi_response)
716 ret = sr_scpi_get_string(scpi, command, &response);
717 if (ret != SR_OK && !response)
720 if (sr_atoi(response, scpi_response) == SR_OK)
731 * Send a SCPI command, read the reply, parse it as a float and store the
732 * result in scpi_response.
734 * @param scpi Previously initialised SCPI device structure.
735 * @param command The SCPI command to send to the device (can be NULL).
736 * @param scpi_response Pointer where to store the parsed result.
738 * @return SR_OK on success, SR_ERR* on failure.
740 SR_PRIV int sr_scpi_get_float(struct sr_scpi_dev_inst *scpi,
741 const char *command, float *scpi_response)
748 ret = sr_scpi_get_string(scpi, command, &response);
749 if (ret != SR_OK && !response)
752 if (sr_atof_ascii(response, scpi_response) == SR_OK)
763 * Send a SCPI command, read the reply, parse it as a double and store the
764 * result in scpi_response.
766 * @param scpi Previously initialised SCPI device structure.
767 * @param command The SCPI command to send to the device (can be NULL).
768 * @param scpi_response Pointer where to store the parsed result.
770 * @return SR_OK on success, SR_ERR* on failure.
772 SR_PRIV int sr_scpi_get_double(struct sr_scpi_dev_inst *scpi,
773 const char *command, double *scpi_response)
780 ret = sr_scpi_get_string(scpi, command, &response);
781 if (ret != SR_OK && !response)
784 if (sr_atod_ascii(response, scpi_response) == SR_OK)
795 * Send a SCPI *OPC? command, read the reply and return the result of the
798 * @param scpi Previously initialised SCPI device structure.
800 * @return SR_OK on success, SR_ERR* on failure.
802 SR_PRIV int sr_scpi_get_opc(struct sr_scpi_dev_inst *scpi)
807 for (i = 0; i < SCPI_READ_RETRIES; i++) {
809 sr_scpi_get_bool(scpi, SCPI_CMD_OPC, &opc);
812 g_usleep(SCPI_READ_RETRY_TIMEOUT_US);
819 * Send a SCPI command, read the reply, parse it as comma separated list of
820 * floats and store the as an result in scpi_response.
822 * @param scpi Previously initialised SCPI device structure.
823 * @param command The SCPI command to send to the device (can be NULL).
824 * @param scpi_response Pointer where to store the parsed result.
826 * @return SR_OK upon successfully parsing all values, SR_ERR* upon a parsing
827 * error or upon no response. The allocated response must be freed by
828 * the caller in the case of an SR_OK as well as in the case of
831 SR_PRIV int sr_scpi_get_floatv(struct sr_scpi_dev_inst *scpi,
832 const char *command, GArray **scpi_response)
837 gchar **ptr, **tokens;
838 GArray *response_array;
843 ret = sr_scpi_get_string(scpi, command, &response);
844 if (ret != SR_OK && !response)
847 tokens = g_strsplit(response, ",", 0);
850 response_array = g_array_sized_new(TRUE, FALSE, sizeof(float), 256);
853 if (sr_atof_ascii(*ptr, &tmp) == SR_OK)
854 response_array = g_array_append_val(response_array,
864 if (ret != SR_OK && response_array->len == 0) {
865 g_array_free(response_array, TRUE);
866 *scpi_response = NULL;
870 *scpi_response = response_array;
876 * Send a SCPI command, read the reply, parse it as comma separated list of
877 * unsigned 8 bit integers and store the as an result in scpi_response.
879 * @param scpi Previously initialised SCPI device structure.
880 * @param command The SCPI command to send to the device (can be NULL).
881 * @param scpi_response Pointer where to store the parsed result.
883 * @return SR_OK upon successfully parsing all values, SR_ERR* upon a parsing
884 * error or upon no response. The allocated response must be freed by
885 * the caller in the case of an SR_OK as well as in the case of
888 SR_PRIV int sr_scpi_get_uint8v(struct sr_scpi_dev_inst *scpi,
889 const char *command, GArray **scpi_response)
893 gchar **ptr, **tokens;
894 GArray *response_array;
899 ret = sr_scpi_get_string(scpi, command, &response);
900 if (ret != SR_OK && !response)
903 tokens = g_strsplit(response, ",", 0);
906 response_array = g_array_sized_new(TRUE, FALSE, sizeof(uint8_t), 256);
909 if (sr_atoi(*ptr, &tmp) == SR_OK)
910 response_array = g_array_append_val(response_array,
920 if (response_array->len == 0) {
921 g_array_free(response_array, TRUE);
922 *scpi_response = NULL;
926 *scpi_response = response_array;
932 * Send a SCPI command, read the reply, parse it as binary data with a
933 * "definite length block" header and store the as an result in scpi_response.
935 * @param scpi Previously initialised SCPI device structure.
936 * @param command The SCPI command to send to the device (can be NULL).
937 * @param scpi_response Pointer where to store the parsed result.
939 * @return SR_OK upon successfully parsing all values, SR_ERR* upon a parsing
940 * error or upon no response. The allocated response must be freed by
941 * the caller in the case of an SR_OK as well as in the case of
944 SR_PRIV int sr_scpi_get_block(struct sr_scpi_dev_inst *scpi,
945 const char *command, GByteArray **scpi_response)
954 g_mutex_lock(&scpi->scpi_mutex);
957 if (scpi_send(scpi, command) != SR_OK) {
958 g_mutex_unlock(&scpi->scpi_mutex);
962 if (sr_scpi_read_begin(scpi) != SR_OK) {
963 g_mutex_unlock(&scpi->scpi_mutex);
968 * Assume an initial maximum length, optionally gets adjusted below.
969 * Prepare a NULL return value for when error paths will be taken.
971 response = g_string_sized_new(1024);
973 timeout = g_get_monotonic_time() + scpi->read_timeout_us;
975 *scpi_response = NULL;
977 /* Get (the first chunk of) the response. */
978 while (response->len < 2) {
979 ret = scpi_read_response(scpi, response, timeout);
981 g_mutex_unlock(&scpi->scpi_mutex);
982 g_string_free(response, TRUE);
988 * SCPI protocol data blocks are preceeded with a length spec.
989 * The length spec consists of a '#' marker, one digit which
990 * specifies the character count of the length spec, and the
991 * respective number of characters which specify the data block's
992 * length. Raw data bytes follow (thus one must no longer assume
993 * that the received input stream would be an ASCIIZ string).
995 * Get the data block length, and strip off the length spec from
996 * the input buffer, leaving just the data bytes.
998 if (response->str[0] != '#') {
999 g_mutex_unlock(&scpi->scpi_mutex);
1000 g_string_free(response, TRUE);
1003 buf[0] = response->str[1];
1005 ret = sr_atol(buf, &llen);
1006 if ((ret != SR_OK) || (llen == 0)) {
1007 g_mutex_unlock(&scpi->scpi_mutex);
1008 g_string_free(response, TRUE);
1012 while (response->len < (unsigned long)(2 + llen)) {
1013 ret = scpi_read_response(scpi, response, timeout);
1015 g_mutex_unlock(&scpi->scpi_mutex);
1016 g_string_free(response, TRUE);
1021 memcpy(buf, &response->str[2], llen);
1023 ret = sr_atol(buf, &datalen);
1024 if ((ret != SR_OK) || (datalen == 0)) {
1025 g_mutex_unlock(&scpi->scpi_mutex);
1026 g_string_free(response, TRUE);
1029 g_string_erase(response, 0, 2 + llen);
1032 * If the initially assumed length does not cover the data block
1033 * length, then re-allocate the buffer size to the now known
1034 * length, and keep reading more chunks of response data.
1036 if (response->len < (unsigned long)(datalen)) {
1037 int oldlen = response->len;
1038 g_string_set_size(response, datalen);
1039 g_string_set_size(response, oldlen);
1042 while (response->len < (unsigned long)(datalen)) {
1043 ret = scpi_read_response(scpi, response, timeout);
1045 g_mutex_unlock(&scpi->scpi_mutex);
1046 g_string_free(response, TRUE);
1050 timeout = g_get_monotonic_time() + scpi->read_timeout_us;
1053 g_mutex_unlock(&scpi->scpi_mutex);
1055 /* Convert received data to byte array. */
1056 *scpi_response = g_byte_array_new_take(
1057 (guint8*)g_string_free(response, FALSE), datalen);
1063 * Send the *IDN? SCPI command, receive the reply, parse it and store the
1064 * reply as a sr_scpi_hw_info structure in the supplied scpi_response pointer.
1066 * The hw_info structure must be freed by the caller via sr_scpi_hw_info_free().
1068 * @param scpi Previously initialised SCPI device structure.
1069 * @param scpi_response Pointer where to store the hw_info structure.
1071 * @return SR_OK upon success, SR_ERR* on failure.
1073 SR_PRIV int sr_scpi_get_hw_id(struct sr_scpi_dev_inst *scpi,
1074 struct sr_scpi_hw_info **scpi_response)
1076 int num_tokens, ret;
1079 struct sr_scpi_hw_info *hw_info;
1085 ret = sr_scpi_get_string(scpi, SCPI_CMD_IDN, &response);
1086 if (ret != SR_OK && !response)
1090 * The response to a '*IDN?' is specified by the SCPI spec. It contains
1091 * a comma-separated list containing the manufacturer name, instrument
1092 * model, serial number of the instrument and the firmware version.
1094 tokens = g_strsplit(response, ",", 0);
1095 num_tokens = g_strv_length(tokens);
1096 if (num_tokens < 4) {
1097 sr_dbg("IDN response not according to spec: %80.s.", response);
1104 hw_info = g_malloc0(sizeof(struct sr_scpi_hw_info));
1106 idn_substr = g_strstr_len(tokens[0], -1, "IDN ");
1107 if (idn_substr == NULL)
1108 hw_info->manufacturer = g_strstrip(g_strdup(tokens[0]));
1110 hw_info->manufacturer = g_strstrip(g_strdup(idn_substr + 4));
1112 hw_info->model = g_strstrip(g_strdup(tokens[1]));
1113 hw_info->serial_number = g_strstrip(g_strdup(tokens[2]));
1114 hw_info->firmware_version = g_strstrip(g_strdup(tokens[3]));
1118 *scpi_response = hw_info;
1124 * Free a sr_scpi_hw_info struct.
1126 * @param hw_info Pointer to the struct to free. If NULL, this
1127 * function does nothing.
1129 SR_PRIV void sr_scpi_hw_info_free(struct sr_scpi_hw_info *hw_info)
1134 g_free(hw_info->manufacturer);
1135 g_free(hw_info->model);
1136 g_free(hw_info->serial_number);
1137 g_free(hw_info->firmware_version);
1142 * Remove potentially enclosing pairs of quotes, un-escape content.
1143 * This implementation modifies the caller's buffer when quotes are found
1144 * and doubled quote characters need to get removed from the content.
1146 * @param[in, out] s The SCPI string to check and un-quote.
1148 * @return The start of the un-quoted string.
1150 SR_PRIV const char *sr_scpi_unquote_string(char *s)
1156 /* Immediately bail out on invalid or short input. */
1163 /* Check for matching quote characters front and back. */
1164 if (s[0] != '\'' && s[0] != '"')
1166 if (s[0] != s[s_len - 1])
1169 /* Need to strip quotes, and un-double quote chars inside. */
1170 quotes[0] = quotes[1] = *s;
1172 s[s_len - 1] = '\0';
1175 while ((rdptr = strstr(rdptr, quotes)) != NULL) {
1176 memmove(rdptr, rdptr + 1, strlen(rdptr));
1183 SR_PRIV const char *sr_vendor_alias(const char *raw_vendor)
1187 for (i = 0; i < ARRAY_SIZE(scpi_vendors); i++) {
1188 if (!g_ascii_strcasecmp(raw_vendor, scpi_vendors[i][0]))
1189 return scpi_vendors[i][1];
1195 SR_PRIV const char *sr_scpi_cmd_get(const struct scpi_command *cmdtable,
1205 for (i = 0; cmdtable[i].string; i++) {
1206 if (cmdtable[i].command == command) {
1207 cmd = cmdtable[i].string;
1215 SR_PRIV int sr_scpi_cmd(const struct sr_dev_inst *sdi,
1216 const struct scpi_command *cmdtable,
1217 int channel_command, const char *channel_name,
1220 struct sr_scpi_dev_inst *scpi;
1223 const char *channel_cmd;
1228 if (!(cmd = sr_scpi_cmd_get(cmdtable, command))) {
1229 /* Device does not implement this command, that's OK. */
1233 g_mutex_lock(&scpi->scpi_mutex);
1235 /* Select channel. */
1236 channel_cmd = sr_scpi_cmd_get(cmdtable, channel_command);
1237 if (channel_cmd && channel_name &&
1238 g_strcmp0(channel_name, scpi->actual_channel_name)) {
1239 sr_spew("sr_scpi_cmd(): new channel = %s", channel_name);
1240 g_free(scpi->actual_channel_name);
1241 scpi->actual_channel_name = g_strdup(channel_name);
1242 ret = scpi_send(scpi, channel_cmd, channel_name);
1247 va_start(args, command);
1248 ret = scpi_send_variadic(scpi, cmd, args);
1251 g_mutex_unlock(&scpi->scpi_mutex);
1256 SR_PRIV int sr_scpi_cmd_resp(const struct sr_dev_inst *sdi,
1257 const struct scpi_command *cmdtable,
1258 int channel_command, const char *channel_name,
1259 GVariant **gvar, const GVariantType *gvtype, int command, ...)
1261 struct sr_scpi_dev_inst *scpi;
1263 const char *channel_cmd;
1273 if (!(cmd = sr_scpi_cmd_get(cmdtable, command))) {
1274 /* Device does not implement this command. */
1278 g_mutex_lock(&scpi->scpi_mutex);
1280 /* Select channel. */
1281 channel_cmd = sr_scpi_cmd_get(cmdtable, channel_command);
1282 if (channel_cmd && channel_name &&
1283 g_strcmp0(channel_name, scpi->actual_channel_name)) {
1284 sr_spew("sr_scpi_cmd_get(): new channel = %s", channel_name);
1285 g_free(scpi->actual_channel_name);
1286 scpi->actual_channel_name = g_strdup(channel_name);
1287 ret = scpi_send(scpi, channel_cmd, channel_name);
1292 va_start(args, command);
1293 ret = scpi_send_variadic(scpi, cmd, args);
1296 g_mutex_unlock(&scpi->scpi_mutex);
1300 response = g_string_sized_new(1024);
1301 ret = scpi_get_data(scpi, NULL, &response);
1303 g_mutex_unlock(&scpi->scpi_mutex);
1305 g_string_free(response, TRUE);
1309 g_mutex_unlock(&scpi->scpi_mutex);
1311 /* Get rid of trailing linefeed if present */
1312 if (response->len >= 1 && response->str[response->len - 1] == '\n')
1313 g_string_truncate(response, response->len - 1);
1315 /* Get rid of trailing carriage return if present */
1316 if (response->len >= 1 && response->str[response->len - 1] == '\r')
1317 g_string_truncate(response, response->len - 1);
1319 s = g_string_free(response, FALSE);
1322 if (g_variant_type_equal(gvtype, G_VARIANT_TYPE_BOOLEAN)) {
1323 if ((ret = parse_strict_bool(s, &b)) == SR_OK)
1324 *gvar = g_variant_new_boolean(b);
1325 } else if (g_variant_type_equal(gvtype, G_VARIANT_TYPE_DOUBLE)) {
1326 if ((ret = sr_atod_ascii(s, &d)) == SR_OK)
1327 *gvar = g_variant_new_double(d);
1328 } else if (g_variant_type_equal(gvtype, G_VARIANT_TYPE_STRING)) {
1329 *gvar = g_variant_new_string(s);
1331 sr_err("Unable to convert to desired GVariant type.");