2 * This file is part of the libsigrok project.
4 * Copyright (C) 2013 poljar (Damir Jelić) <poljarinho@gmail.com>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include <libsigrok/libsigrok.h>
24 #include "libsigrok-internal.h"
27 #define LOG_PREFIX "scpi"
29 #define SCPI_READ_RETRIES 100
30 #define SCPI_READ_RETRY_TIMEOUT_US (10 * 1000)
33 * Parse a string representation of a boolean-like value into a gboolean.
34 * Similar to sr_parse_boolstring but rejects strings which do not represent
35 * a boolean-like value.
37 * @param str String to convert.
38 * @param ret Pointer to a gboolean where the result of the conversion will be
41 * @return SR_OK on success, SR_ERR on failure.
43 static int parse_strict_bool(const char *str, gboolean *ret)
48 if (!g_strcmp0(str, "1") ||
49 !g_ascii_strncasecmp(str, "y", 1) ||
50 !g_ascii_strncasecmp(str, "t", 1) ||
51 !g_ascii_strncasecmp(str, "yes", 3) ||
52 !g_ascii_strncasecmp(str, "true", 4) ||
53 !g_ascii_strncasecmp(str, "on", 2)) {
56 } else if (!g_strcmp0(str, "0") ||
57 !g_ascii_strncasecmp(str, "n", 1) ||
58 !g_ascii_strncasecmp(str, "f", 1) ||
59 !g_ascii_strncasecmp(str, "no", 2) ||
60 !g_ascii_strncasecmp(str, "false", 5) ||
61 !g_ascii_strncasecmp(str, "off", 3)) {
69 SR_PRIV extern const struct sr_scpi_dev_inst scpi_serial_dev;
70 SR_PRIV extern const struct sr_scpi_dev_inst scpi_tcp_raw_dev;
71 SR_PRIV extern const struct sr_scpi_dev_inst scpi_tcp_rigol_dev;
72 SR_PRIV extern const struct sr_scpi_dev_inst scpi_usbtmc_libusb_dev;
73 SR_PRIV extern const struct sr_scpi_dev_inst scpi_vxi_dev;
74 SR_PRIV extern const struct sr_scpi_dev_inst scpi_visa_dev;
75 SR_PRIV extern const struct sr_scpi_dev_inst scpi_libgpib_dev;
77 static const struct sr_scpi_dev_inst *scpi_devs[] = {
80 #ifdef HAVE_LIBUSB_1_0
81 &scpi_usbtmc_libusb_dev,
92 #ifdef HAVE_LIBSERIALPORT
93 &scpi_serial_dev, /* Must be last as it matches any resource. */
97 static struct sr_dev_inst *sr_scpi_scan_resource(struct drv_context *drvc,
98 const char *resource, const char *serialcomm,
99 struct sr_dev_inst *(*probe_device)(struct sr_scpi_dev_inst *scpi))
101 struct sr_scpi_dev_inst *scpi;
102 struct sr_dev_inst *sdi;
104 if (!(scpi = scpi_dev_inst_new(drvc, resource, serialcomm)))
107 if (sr_scpi_open(scpi) != SR_OK) {
108 sr_info("Couldn't open SCPI device.");
113 sdi = probe_device(scpi);
118 sdi->status = SR_ST_INACTIVE;
125 SR_PRIV GSList *sr_scpi_scan(struct drv_context *drvc, GSList *options,
126 struct sr_dev_inst *(*probe_device)(struct sr_scpi_dev_inst *scpi))
128 GSList *resources, *l, *devices;
129 struct sr_dev_inst *sdi;
130 const char *resource = NULL;
131 const char *serialcomm = NULL;
135 for (l = options; l; l = l->next) {
136 struct sr_config *src = l->data;
139 resource = g_variant_get_string(src->data, NULL);
141 case SR_CONF_SERIALCOMM:
142 serialcomm = g_variant_get_string(src->data, NULL);
148 for (i = 0; i < ARRAY_SIZE(scpi_devs); i++) {
149 if ((resource && strcmp(resource, scpi_devs[i]->prefix))
150 || !scpi_devs[i]->scan)
152 resources = scpi_devs[i]->scan(drvc);
153 for (l = resources; l; l = l->next) {
154 res = g_strsplit(l->data, ":", 2);
155 if (res[0] && (sdi = sr_scpi_scan_resource(drvc, res[0],
156 serialcomm ? serialcomm : res[1], probe_device))) {
157 devices = g_slist_append(devices, sdi);
158 sdi->connection_id = g_strdup(l->data);
162 g_slist_free_full(resources, g_free);
165 if (!devices && resource) {
166 sdi = sr_scpi_scan_resource(drvc, resource, serialcomm, probe_device);
168 devices = g_slist_append(NULL, sdi);
171 /* Tack a copy of the newly found devices onto the driver list. */
173 drvc->instances = g_slist_concat(drvc->instances, g_slist_copy(devices));
178 SR_PRIV struct sr_scpi_dev_inst *scpi_dev_inst_new(struct drv_context *drvc,
179 const char *resource, const char *serialcomm)
181 struct sr_scpi_dev_inst *scpi = NULL;
182 const struct sr_scpi_dev_inst *scpi_dev;
186 for (i = 0; i < ARRAY_SIZE(scpi_devs); i++) {
187 scpi_dev = scpi_devs[i];
188 if (!strncmp(resource, scpi_dev->prefix, strlen(scpi_dev->prefix))) {
189 sr_dbg("Opening %s device %s.", scpi_dev->name, resource);
190 scpi = g_malloc(sizeof(*scpi));
192 scpi->priv = g_malloc0(scpi->priv_size);
193 scpi->read_timeout_ms = 1000;
194 params = g_strsplit(resource, "/", 0);
195 if (scpi->dev_inst_new(scpi->priv, drvc, resource,
196 params, serialcomm) != SR_OK) {
211 * @param scpi Previously initialized SCPI device structure.
213 * @return SR_OK on success, SR_ERR on failure.
215 SR_PRIV int sr_scpi_open(struct sr_scpi_dev_inst *scpi)
217 return scpi->open(scpi);
221 * Add an event source for an SCPI device.
223 * @param session The session to add the event source to.
224 * @param scpi Previously initialized SCPI device structure.
225 * @param events Events to check for.
226 * @param timeout Max time to wait before the callback is called, ignored if 0.
227 * @param cb Callback function to add. Must not be NULL.
228 * @param cb_data Data for the callback function. Can be NULL.
230 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or
231 * SR_ERR_MALLOC upon memory allocation errors.
233 SR_PRIV int sr_scpi_source_add(struct sr_session *session,
234 struct sr_scpi_dev_inst *scpi, int events, int timeout,
235 sr_receive_data_callback cb, void *cb_data)
237 return scpi->source_add(session, scpi->priv, events, timeout, cb, cb_data);
241 * Remove event source for an SCPI device.
243 * @param session The session to remove the event source from.
244 * @param scpi Previously initialized SCPI device structure.
246 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or
247 * SR_ERR_MALLOC upon memory allocation errors, SR_ERR_BUG upon
250 SR_PRIV int sr_scpi_source_remove(struct sr_session *session,
251 struct sr_scpi_dev_inst *scpi)
253 return scpi->source_remove(session, scpi->priv);
257 * Send a SCPI command.
259 * @param scpi Previously initialized SCPI device structure.
260 * @param format Format string, to be followed by any necessary arguments.
262 * @return SR_OK on success, SR_ERR on failure.
264 SR_PRIV int sr_scpi_send(struct sr_scpi_dev_inst *scpi,
265 const char *format, ...)
270 va_start(args, format);
271 ret = sr_scpi_send_variadic(scpi, format, args);
278 * Send a SCPI command with a variadic argument list.
280 * @param scpi Previously initialized SCPI device structure.
281 * @param format Format string.
282 * @param args Argument list.
284 * @return SR_OK on success, SR_ERR on failure.
286 SR_PRIV int sr_scpi_send_variadic(struct sr_scpi_dev_inst *scpi,
287 const char *format, va_list args)
293 /* Get length of buffer required. */
294 va_copy(args_copy, args);
295 len = vsnprintf(NULL, 0, format, args_copy);
298 /* Allocate buffer and write out command. */
299 buf = g_malloc0(len + 2);
300 vsprintf(buf, format, args);
301 if (buf[len - 1] != '\n')
305 ret = scpi->send(scpi->priv, buf);
307 /* Free command buffer. */
314 * Begin receiving an SCPI reply.
316 * @param scpi Previously initialised SCPI device structure.
318 * @return SR_OK on success, SR_ERR on failure.
320 SR_PRIV int sr_scpi_read_begin(struct sr_scpi_dev_inst *scpi)
322 return scpi->read_begin(scpi->priv);
326 * Read part of a response from SCPI device.
328 * @param scpi Previously initialised SCPI device structure.
329 * @param buf Buffer to store result.
330 * @param maxlen Maximum number of bytes to read.
332 * @return Number of bytes read, or SR_ERR upon failure.
334 SR_PRIV int sr_scpi_read_data(struct sr_scpi_dev_inst *scpi,
335 char *buf, int maxlen)
337 return scpi->read_data(scpi->priv, buf, maxlen);
341 * Check whether a complete SCPI response has been received.
343 * @param scpi Previously initialised SCPI device structure.
345 * @return 1 if complete, 0 otherwise.
347 SR_PRIV int sr_scpi_read_complete(struct sr_scpi_dev_inst *scpi)
349 return scpi->read_complete(scpi->priv);
355 * @param scpi Previously initialized SCPI device structure.
357 * @return SR_OK on success, SR_ERR on failure.
359 SR_PRIV int sr_scpi_close(struct sr_scpi_dev_inst *scpi)
361 return scpi->close(scpi);
367 * @param scpi Previously initialized SCPI device structure.
369 * @return SR_OK on success, SR_ERR on failure.
371 SR_PRIV void sr_scpi_free(struct sr_scpi_dev_inst *scpi)
373 scpi->free(scpi->priv);
379 * Send a SCPI command, receive the reply and store the reply in scpi_response.
381 * @param scpi Previously initialised SCPI device structure.
382 * @param command The SCPI command to send to the device (can be NULL).
383 * @param scpi_response Pointer where to store the SCPI response.
385 * @return SR_OK on success, SR_ERR* on failure.
387 SR_PRIV int sr_scpi_get_string(struct sr_scpi_dev_inst *scpi,
388 const char *command, char **scpi_response)
391 response = g_string_sized_new(1024);
393 if (sr_scpi_get_data(scpi, command, &response) != SR_OK) {
395 g_string_free(response, TRUE);
399 /* Get rid of trailing linefeed if present */
400 if (response->len >= 1 && response->str[response->len - 1] == '\n')
401 g_string_truncate(response, response->len - 1);
403 /* Get rid of trailing carriage return if present */
404 if (response->len >= 1 && response->str[response->len - 1] == '\r')
405 g_string_truncate(response, response->len - 1);
407 sr_spew("Got response: '%.70s', length %" G_GSIZE_FORMAT ".",
408 response->str, response->len);
410 *scpi_response = g_string_free(response, FALSE);
415 SR_PRIV int sr_scpi_get_data(struct sr_scpi_dev_inst *scpi,
416 const char *command, GString **scpi_response)
421 unsigned int elapsed_ms;
425 /* Optionally send caller provided command. */
427 if (sr_scpi_send(scpi, command) != SR_OK)
431 /* Initiate SCPI read operation. */
432 if (sr_scpi_read_begin(scpi) != SR_OK)
435 /* Keep reading until completion or until timeout. */
436 laststart = g_get_monotonic_time();
438 response = *scpi_response;
439 offset = response->len;
441 while (!sr_scpi_read_complete(scpi)) {
442 /* Resize the buffer when free space drops below a threshold. */
443 space = response->allocated_len - response->len;
445 g_string_set_size(response, response->len + 1024);
446 g_string_set_size(response, offset);
447 space = response->allocated_len - response->len;
449 /* Read another chunk of the response. */
450 len = sr_scpi_read_data(scpi, &response->str[offset], space);
452 sr_err("Incompletely read SCPI response.");
454 } else if (len > 0) {
455 laststart = g_get_monotonic_time();
458 g_string_set_size(response, offset);
459 /* Quit reading after a period of time without receive data. */
460 elapsed_ms = (g_get_monotonic_time() - laststart) / 1000;
461 if (elapsed_ms >= scpi->read_timeout_ms) {
462 sr_err("Timed out waiting for SCPI response.");
471 * Send a SCPI command, read the reply, parse it as a bool value and store the
472 * result in scpi_response.
474 * @param scpi Previously initialised SCPI device structure.
475 * @param command The SCPI command to send to the device (can be NULL).
476 * @param scpi_response Pointer where to store the parsed result.
478 * @return SR_OK on success, SR_ERR* on failure.
480 SR_PRIV int sr_scpi_get_bool(struct sr_scpi_dev_inst *scpi,
481 const char *command, gboolean *scpi_response)
488 ret = sr_scpi_get_string(scpi, command, &response);
489 if (ret != SR_OK && !response)
492 if (parse_strict_bool(response, scpi_response) == SR_OK)
503 * Send a SCPI command, read the reply, parse it as an integer and store the
504 * result in scpi_response.
506 * @param scpi Previously initialised SCPI device structure.
507 * @param command The SCPI command to send to the device (can be NULL).
508 * @param scpi_response Pointer where to store the parsed result.
510 * @return SR_OK on success, SR_ERR* on failure.
512 SR_PRIV int sr_scpi_get_int(struct sr_scpi_dev_inst *scpi,
513 const char *command, int *scpi_response)
520 ret = sr_scpi_get_string(scpi, command, &response);
521 if (ret != SR_OK && !response)
524 if (sr_atoi(response, scpi_response) == SR_OK)
535 * Send a SCPI command, read the reply, parse it as a float and store the
536 * result in scpi_response.
538 * @param scpi Previously initialised SCPI device structure.
539 * @param command The SCPI command to send to the device (can be NULL).
540 * @param scpi_response Pointer where to store the parsed result.
542 * @return SR_OK on success, SR_ERR* on failure.
544 SR_PRIV int sr_scpi_get_float(struct sr_scpi_dev_inst *scpi,
545 const char *command, float *scpi_response)
552 ret = sr_scpi_get_string(scpi, command, &response);
553 if (ret != SR_OK && !response)
556 if (sr_atof_ascii(response, scpi_response) == SR_OK)
567 * Send a SCPI command, read the reply, parse it as a double and store the
568 * result in scpi_response.
570 * @param scpi Previously initialised SCPI device structure.
571 * @param command The SCPI command to send to the device (can be NULL).
572 * @param scpi_response Pointer where to store the parsed result.
574 * @return SR_OK on success, SR_ERR* on failure.
576 SR_PRIV int sr_scpi_get_double(struct sr_scpi_dev_inst *scpi,
577 const char *command, double *scpi_response)
584 ret = sr_scpi_get_string(scpi, command, &response);
585 if (ret != SR_OK && !response)
588 if (sr_atod(response, scpi_response) == SR_OK)
599 * Send a SCPI *OPC? command, read the reply and return the result of the
602 * @param scpi Previously initialised SCPI device structure.
604 * @return SR_OK on success, SR_ERR* on failure.
606 SR_PRIV int sr_scpi_get_opc(struct sr_scpi_dev_inst *scpi)
611 for (i = 0; i < SCPI_READ_RETRIES; i++) {
612 sr_scpi_get_bool(scpi, SCPI_CMD_OPC, &opc);
615 g_usleep(SCPI_READ_RETRY_TIMEOUT_US);
622 * Send a SCPI command, read the reply, parse it as comma separated list of
623 * floats and store the as an result in scpi_response.
625 * @param scpi Previously initialised SCPI device structure.
626 * @param command The SCPI command to send to the device (can be NULL).
627 * @param scpi_response Pointer where to store the parsed result.
629 * @return SR_OK upon successfully parsing all values, SR_ERR* upon a parsing
630 * error or upon no response. The allocated response must be freed by
631 * the caller in the case of an SR_OK as well as in the case of
634 SR_PRIV int sr_scpi_get_floatv(struct sr_scpi_dev_inst *scpi,
635 const char *command, GArray **scpi_response)
640 gchar **ptr, **tokens;
641 GArray *response_array;
646 ret = sr_scpi_get_string(scpi, command, &response);
647 if (ret != SR_OK && !response)
650 tokens = g_strsplit(response, ",", 0);
653 response_array = g_array_sized_new(TRUE, FALSE, sizeof(float), 256);
656 if (sr_atof_ascii(*ptr, &tmp) == SR_OK)
657 response_array = g_array_append_val(response_array,
667 if (ret != SR_OK && response_array->len == 0) {
668 g_array_free(response_array, TRUE);
669 *scpi_response = NULL;
673 *scpi_response = response_array;
679 * Send a SCPI command, read the reply, parse it as comma separated list of
680 * unsigned 8 bit integers and store the as an result in scpi_response.
682 * @param scpi Previously initialised SCPI device structure.
683 * @param command The SCPI command to send to the device (can be NULL).
684 * @param scpi_response Pointer where to store the parsed result.
686 * @return SR_OK upon successfully parsing all values, SR_ERR* upon a parsing
687 * error or upon no response. The allocated response must be freed by
688 * the caller in the case of an SR_OK as well as in the case of
691 SR_PRIV int sr_scpi_get_uint8v(struct sr_scpi_dev_inst *scpi,
692 const char *command, GArray **scpi_response)
696 gchar **ptr, **tokens;
697 GArray *response_array;
702 ret = sr_scpi_get_string(scpi, command, &response);
703 if (ret != SR_OK && !response)
706 tokens = g_strsplit(response, ",", 0);
709 response_array = g_array_sized_new(TRUE, FALSE, sizeof(uint8_t), 256);
712 if (sr_atoi(*ptr, &tmp) == SR_OK)
713 response_array = g_array_append_val(response_array,
723 if (response_array->len == 0) {
724 g_array_free(response_array, TRUE);
725 *scpi_response = NULL;
729 *scpi_response = response_array;
735 * Send a SCPI command, read the reply, parse it as binary data with a
736 * "definite length block" header and store the as an result in scpi_response.
738 * @param scpi Previously initialised SCPI device structure.
739 * @param command The SCPI command to send to the device (can be NULL).
740 * @param scpi_response Pointer where to store the parsed result.
742 * @return SR_OK upon successfully parsing all values, SR_ERR* upon a parsing
743 * error or upon no response. The allocated response must be freed by
744 * the caller in the case of an SR_OK as well as in the case of
747 SR_PRIV int sr_scpi_get_block(struct sr_scpi_dev_inst *scpi,
748 const char *command, GByteArray **scpi_response)
757 * Assume an initial maximum length, optionally gets adjusted below.
758 * Prepare a NULL return value for when error paths will be taken.
760 response = g_string_sized_new(1024);
761 *scpi_response = NULL;
763 /* Get (the first chunk of) the response. */
764 ret = sr_scpi_get_data(scpi, command, &response);
766 g_string_free(response, TRUE);
771 * SCPI protocol data blocks are preceeded with a length spec.
772 * The length spec consists of a '#' marker, one digit which
773 * specifies the character count of the length spec, and the
774 * respective number of characters which specify the data block's
775 * length. Raw data bytes follow (thus one must no longer assume
776 * that the received input stream would be an ASCIIZ string).
778 * Get the data block length, and strip off the length spec from
779 * the input buffer, leaving just the data bytes.
781 if (response->str[0] != '#') {
782 g_string_free(response, TRUE);
785 buf[0] = response->str[1];
787 ret = sr_atol(buf, &llen);
788 if ((ret != SR_OK) || (llen == 0)) {
789 g_string_free(response, TRUE);
792 memcpy(buf, &response->str[2], llen);
794 ret = sr_atol(buf, &datalen);
795 if ((ret != SR_OK) || (datalen == 0)) {
796 g_string_free(response, TRUE);
799 g_string_erase(response, 0, 2 + llen);
802 * If the initially assumed length does not cover the data block
803 * length, then re-allocate the buffer size to the now known
804 * length, and keep reading more chunks of response data.
806 if (response->len < (unsigned long)(datalen)) {
807 int oldlen = response->len;
808 g_string_set_size(response, datalen);
809 g_string_set_size(response, oldlen);
811 while (response->len < (unsigned long)(datalen)) {
812 ret = sr_scpi_get_data(scpi, NULL, &response);
814 g_string_free(response, TRUE);
819 /* Convert received data to byte array. */
820 *scpi_response = g_byte_array_new_take(
821 (guint8*)g_string_free(response, FALSE), datalen);
827 * Send the *IDN? SCPI command, receive the reply, parse it and store the
828 * reply as a sr_scpi_hw_info structure in the supplied scpi_response pointer.
830 * The hw_info structure must be freed by the caller via sr_scpi_hw_info_free().
832 * @param scpi Previously initialised SCPI device structure.
833 * @param scpi_response Pointer where to store the hw_info structure.
835 * @return SR_OK upon success, SR_ERR* on failure.
837 SR_PRIV int sr_scpi_get_hw_id(struct sr_scpi_dev_inst *scpi,
838 struct sr_scpi_hw_info **scpi_response)
843 struct sr_scpi_hw_info *hw_info;
848 ret = sr_scpi_get_string(scpi, SCPI_CMD_IDN, &response);
849 if (ret != SR_OK && !response)
852 sr_info("Got IDN string: '%s'", response);
855 * The response to a '*IDN?' is specified by the SCPI spec. It contains
856 * a comma-separated list containing the manufacturer name, instrument
857 * model, serial number of the instrument and the firmware version.
859 tokens = g_strsplit(response, ",", 0);
861 for (num_tokens = 0; tokens[num_tokens] != NULL; num_tokens++);
863 if (num_tokens < 4) {
864 sr_dbg("IDN response not according to spec: %80.s.", response);
871 hw_info = g_malloc0(sizeof(struct sr_scpi_hw_info));
872 hw_info->manufacturer = g_strstrip(g_strdup(tokens[0]));
873 hw_info->model = g_strstrip(g_strdup(tokens[1]));
874 hw_info->serial_number = g_strstrip(g_strdup(tokens[2]));
875 hw_info->firmware_version = g_strstrip(g_strdup(tokens[3]));
879 *scpi_response = hw_info;
885 * Free a sr_scpi_hw_info struct.
887 * @param hw_info Pointer to the struct to free.
889 * This function is safe to call with a NULL pointer.
891 SR_PRIV void sr_scpi_hw_info_free(struct sr_scpi_hw_info *hw_info)
894 g_free(hw_info->manufacturer);
895 g_free(hw_info->model);
896 g_free(hw_info->serial_number);
897 g_free(hw_info->firmware_version);