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/>.
26 SR_PRIV void hmo_queue_logic_data(struct dev_context *devc,
27 size_t group, GByteArray *pod_data);
28 SR_PRIV void hmo_send_logic_packet(struct sr_dev_inst *sdi,
29 struct dev_context *devc);
30 SR_PRIV void hmo_cleanup_logic_data(struct dev_context *devc);
32 static const char *hameg_scpi_dialect[] = {
33 [SCPI_CMD_GET_DIG_DATA] = ":FORM UINT,8;:POD%d:DATA?",
34 [SCPI_CMD_GET_TIMEBASE] = ":TIM:SCAL?",
35 [SCPI_CMD_SET_TIMEBASE] = ":TIM:SCAL %s",
36 [SCPI_CMD_GET_COUPLING] = ":CHAN%d:COUP?",
37 [SCPI_CMD_SET_COUPLING] = ":CHAN%d:COUP %s",
38 [SCPI_CMD_GET_SAMPLE_RATE] = ":ACQ:SRAT?",
39 [SCPI_CMD_GET_SAMPLE_RATE_LIVE] = ":%s:DATA:POINTS?",
40 [SCPI_CMD_GET_ANALOG_DATA] = ":FORM:BORD %s;" \
41 ":FORM REAL,32;:CHAN%d:DATA?",
42 [SCPI_CMD_GET_VERTICAL_DIV] = ":CHAN%d:SCAL?",
43 [SCPI_CMD_SET_VERTICAL_DIV] = ":CHAN%d:SCAL %s",
44 [SCPI_CMD_GET_DIG_POD_STATE] = ":POD%d:STAT?",
45 [SCPI_CMD_SET_DIG_POD_STATE] = ":POD%d:STAT %d",
46 [SCPI_CMD_GET_TRIGGER_SLOPE] = ":TRIG:A:EDGE:SLOP?",
47 [SCPI_CMD_SET_TRIGGER_SLOPE] = ":TRIG:A:EDGE:SLOP %s",
48 [SCPI_CMD_GET_TRIGGER_SOURCE] = ":TRIG:A:SOUR?",
49 [SCPI_CMD_SET_TRIGGER_SOURCE] = ":TRIG:A:SOUR %s",
50 [SCPI_CMD_GET_DIG_CHAN_STATE] = ":LOG%d:STAT?",
51 [SCPI_CMD_SET_DIG_CHAN_STATE] = ":LOG%d:STAT %d",
52 [SCPI_CMD_GET_VERTICAL_OFFSET] = ":CHAN%d:POS?",
53 [SCPI_CMD_GET_HORIZ_TRIGGERPOS] = ":TIM:POS?",
54 [SCPI_CMD_SET_HORIZ_TRIGGERPOS] = ":TIM:POS %s",
55 [SCPI_CMD_GET_ANALOG_CHAN_STATE] = ":CHAN%d:STAT?",
56 [SCPI_CMD_SET_ANALOG_CHAN_STATE] = ":CHAN%d:STAT %d",
57 [SCPI_CMD_GET_PROBE_UNIT] = ":PROB%d:SET:ATT:UNIT?",
60 static const uint32_t devopts[] = {
62 SR_CONF_LIMIT_FRAMES | SR_CONF_GET | SR_CONF_SET,
63 SR_CONF_SAMPLERATE | SR_CONF_GET,
64 SR_CONF_TIMEBASE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
65 SR_CONF_NUM_HDIV | SR_CONF_GET,
66 SR_CONF_HORIZ_TRIGGERPOS | SR_CONF_GET | SR_CONF_SET,
67 SR_CONF_TRIGGER_SOURCE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
68 SR_CONF_TRIGGER_SLOPE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
71 static const uint32_t devopts_cg_analog[] = {
72 SR_CONF_NUM_VDIV | SR_CONF_GET,
73 SR_CONF_VDIV | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
74 SR_CONF_COUPLING | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
77 static const char *coupling_options[] = {
78 "AC", // AC with 50 Ohm termination (152x, 202x, 30xx, 1202)
79 "ACL", // AC with 1 MOhm termination
80 "DC", // DC with 50 Ohm termination
81 "DCL", // DC with 1 MOhm termination
86 static const char *scope_trigger_slopes[] = {
93 static const char *compact2_trigger_sources[] = {
112 static const char *compact4_trigger_sources[] = {
133 static const char *compact4_dig16_trigger_sources[] = {
162 static const uint64_t timebases[][2] = {
201 static const uint64_t vdivs[][2] = {
221 static const char *scope_analog_channel_names[] = {
228 static const char *scope_digital_channel_names[] = {
247 static const struct scope_config scope_models[] = {
249 /* HMO2522/3032/3042/3052 support 16 digital channels but they're not supported yet. */
250 .name = {"HMO1002", "HMO722", "HMO1022", "HMO1522", "HMO2022", "HMO2522",
251 "HMO3032", "HMO3042", "HMO3052", NULL},
252 .analog_channels = 2,
253 .digital_channels = 8,
256 .analog_names = &scope_analog_channel_names,
257 .digital_names = &scope_digital_channel_names,
260 .num_devopts = ARRAY_SIZE(devopts),
262 .devopts_cg_analog = &devopts_cg_analog,
263 .num_devopts_cg_analog = ARRAY_SIZE(devopts_cg_analog),
265 .coupling_options = &coupling_options,
266 .trigger_sources = &compact2_trigger_sources,
267 .trigger_slopes = &scope_trigger_slopes,
269 .timebases = &timebases,
270 .num_timebases = ARRAY_SIZE(timebases),
273 .num_vdivs = ARRAY_SIZE(vdivs),
278 .scpi_dialect = &hameg_scpi_dialect,
281 .name = {"HMO724", "HMO1024", "HMO1524", "HMO2024", NULL},
282 .analog_channels = 4,
283 .digital_channels = 8,
286 .analog_names = &scope_analog_channel_names,
287 .digital_names = &scope_digital_channel_names,
290 .num_devopts = ARRAY_SIZE(devopts),
292 .devopts_cg_analog = &devopts_cg_analog,
293 .num_devopts_cg_analog = ARRAY_SIZE(devopts_cg_analog),
295 .coupling_options = &coupling_options,
296 .trigger_sources = &compact4_trigger_sources,
297 .trigger_slopes = &scope_trigger_slopes,
299 .timebases = &timebases,
300 .num_timebases = ARRAY_SIZE(timebases),
303 .num_vdivs = ARRAY_SIZE(vdivs),
308 .scpi_dialect = &hameg_scpi_dialect,
311 .name = {"HMO2524", "HMO3034", "HMO3044", "HMO3054", "HMO3524", NULL},
312 .analog_channels = 4,
313 .digital_channels = 16,
316 .analog_names = &scope_analog_channel_names,
317 .digital_names = &scope_digital_channel_names,
320 .num_devopts = ARRAY_SIZE(devopts),
322 .devopts_cg_analog = &devopts_cg_analog,
323 .num_devopts_cg_analog = ARRAY_SIZE(devopts_cg_analog),
325 .coupling_options = &coupling_options,
326 .trigger_sources = &compact4_dig16_trigger_sources,
327 .trigger_slopes = &scope_trigger_slopes,
329 .timebases = &timebases,
330 .num_timebases = ARRAY_SIZE(timebases),
333 .num_vdivs = ARRAY_SIZE(vdivs),
338 .scpi_dialect = &hameg_scpi_dialect,
342 static void scope_state_dump(const struct scope_config *config,
343 struct scope_state *state)
348 for (i = 0; i < config->analog_channels; i++) {
349 tmp = sr_voltage_string((*config->vdivs)[state->analog_channels[i].vdiv][0],
350 (*config->vdivs)[state->analog_channels[i].vdiv][1]);
351 sr_info("State of analog channel %d -> %s : %s (coupling) %s (vdiv) %2.2e (offset)",
352 i + 1, state->analog_channels[i].state ? "On" : "Off",
353 (*config->coupling_options)[state->analog_channels[i].coupling],
354 tmp, state->analog_channels[i].vertical_offset);
357 for (i = 0; i < config->digital_channels; i++) {
358 sr_info("State of digital channel %d -> %s", i,
359 state->digital_channels[i] ? "On" : "Off");
362 for (i = 0; i < config->digital_pods; i++) {
363 sr_info("State of digital POD %d -> %s", i,
364 state->digital_pods[i] ? "On" : "Off");
367 tmp = sr_period_string((*config->timebases)[state->timebase][0],
368 (*config->timebases)[state->timebase][1]);
369 sr_info("Current timebase: %s", tmp);
372 tmp = sr_samplerate_string(state->sample_rate);
373 sr_info("Current samplerate: %s", tmp);
376 sr_info("Current trigger: %s (source), %s (slope) %.2f (offset)",
377 (*config->trigger_sources)[state->trigger_source],
378 (*config->trigger_slopes)[state->trigger_slope],
379 state->horiz_triggerpos);
382 static int scope_state_get_array_option(struct sr_scpi_dev_inst *scpi,
383 const char *command, const char *(*array)[], int *result)
388 if (sr_scpi_get_string(scpi, command, &tmp) != SR_OK) {
393 for (i = 0; (*array)[i]; i++) {
394 if (!g_strcmp0(tmp, (*array)[i])) {
411 * This function takes a value of the form "2.000E-03" and returns the index
412 * of an array where a matching pair was found.
414 * @param value The string to be parsed.
415 * @param array The array of s/f pairs.
416 * @param array_len The number of pairs in the array.
417 * @param result The index at which a matching pair was found.
419 * @return SR_ERR on any parsing error, SR_OK otherwise.
421 static int array_float_get(gchar *value, const uint64_t array[][2],
422 int array_len, unsigned int *result)
424 struct sr_rational rval;
425 struct sr_rational aval;
427 if (sr_parse_rational(value, &rval) != SR_OK)
430 for (int i = 0; i < array_len; i++) {
431 sr_rational_set(&aval, array[i][0], array[i][1]);
432 if (sr_rational_eq(&rval, &aval)) {
441 static int analog_channel_state_get(struct sr_scpi_dev_inst *scpi,
442 const struct scope_config *config,
443 struct scope_state *state)
446 char command[MAX_COMMAND_SIZE];
449 for (i = 0; i < config->analog_channels; i++) {
450 g_snprintf(command, sizeof(command),
451 (*config->scpi_dialect)[SCPI_CMD_GET_ANALOG_CHAN_STATE],
454 if (sr_scpi_get_bool(scpi, command,
455 &state->analog_channels[i].state) != SR_OK)
458 g_snprintf(command, sizeof(command),
459 (*config->scpi_dialect)[SCPI_CMD_GET_VERTICAL_DIV],
462 if (sr_scpi_get_string(scpi, command, &tmp_str) != SR_OK)
465 if (array_float_get(tmp_str, ARRAY_AND_SIZE(vdivs), &j) != SR_OK) {
467 sr_err("Could not determine array index for vertical div scale.");
472 state->analog_channels[i].vdiv = j;
474 g_snprintf(command, sizeof(command),
475 (*config->scpi_dialect)[SCPI_CMD_GET_VERTICAL_OFFSET],
478 if (sr_scpi_get_float(scpi, command,
479 &state->analog_channels[i].vertical_offset) != SR_OK)
482 g_snprintf(command, sizeof(command),
483 (*config->scpi_dialect)[SCPI_CMD_GET_COUPLING],
486 if (scope_state_get_array_option(scpi, command, config->coupling_options,
487 &state->analog_channels[i].coupling) != SR_OK)
490 g_snprintf(command, sizeof(command),
491 (*config->scpi_dialect)[SCPI_CMD_GET_PROBE_UNIT],
494 if (sr_scpi_get_string(scpi, command, &tmp_str) != SR_OK)
497 if (tmp_str[0] == 'A')
498 state->analog_channels[i].probe_unit = 'A';
500 state->analog_channels[i].probe_unit = 'V';
507 static int digital_channel_state_get(struct sr_scpi_dev_inst *scpi,
508 const struct scope_config *config,
509 struct scope_state *state)
512 char command[MAX_COMMAND_SIZE];
514 for (i = 0; i < config->digital_channels; i++) {
515 g_snprintf(command, sizeof(command),
516 (*config->scpi_dialect)[SCPI_CMD_GET_DIG_CHAN_STATE],
519 if (sr_scpi_get_bool(scpi, command,
520 &state->digital_channels[i]) != SR_OK)
524 for (i = 0; i < config->digital_pods; i++) {
525 g_snprintf(command, sizeof(command),
526 (*config->scpi_dialect)[SCPI_CMD_GET_DIG_POD_STATE],
529 if (sr_scpi_get_bool(scpi, command,
530 &state->digital_pods[i]) != SR_OK)
537 SR_PRIV int hmo_update_sample_rate(const struct sr_dev_inst *sdi)
539 struct dev_context *devc;
540 struct scope_state *state;
541 const struct scope_config *config;
546 gboolean channel_found;
547 char tmp_str[MAX_COMMAND_SIZE];
551 config = devc->model_config;
552 state = devc->model_state;
553 channel_found = FALSE;
555 for (i = 0; i < config->analog_channels; i++) {
556 if (state->analog_channels[i].state) {
557 g_snprintf(chan_name, sizeof(chan_name), "CHAN%d", i + 1);
558 g_snprintf(tmp_str, sizeof(tmp_str),
559 (*config->scpi_dialect)[SCPI_CMD_GET_SAMPLE_RATE_LIVE],
561 channel_found = TRUE;
566 if (!channel_found) {
567 for (i = 0; i < config->digital_pods; i++) {
568 if (state->digital_pods[i]) {
569 g_snprintf(chan_name, sizeof(chan_name), "POD%d", i);
570 g_snprintf(tmp_str, sizeof(tmp_str),
571 (*config->scpi_dialect)[SCPI_CMD_GET_SAMPLE_RATE_LIVE],
573 channel_found = TRUE;
579 /* No channel is active, ask the instrument for the sample rate
580 * in single shot mode */
581 if (!channel_found) {
582 if (sr_scpi_get_float(sdi->conn,
583 (*config->scpi_dialect)[SCPI_CMD_GET_SAMPLE_RATE],
584 &tmp_float) != SR_OK)
587 state->sample_rate = tmp_float;
589 if (sr_scpi_get_int(sdi->conn, tmp_str, &tmp) != SR_OK)
591 state->sample_rate = tmp / (((float) (*config->timebases)[state->timebase][0] /
592 (*config->timebases)[state->timebase][1]) *
599 SR_PRIV int hmo_scope_state_get(struct sr_dev_inst *sdi)
601 struct dev_context *devc;
602 struct scope_state *state;
603 const struct scope_config *config;
609 config = devc->model_config;
610 state = devc->model_state;
612 sr_info("Fetching scope state");
614 if (analog_channel_state_get(sdi->conn, config, state) != SR_OK)
617 if (digital_channel_state_get(sdi->conn, config, state) != SR_OK)
620 if (sr_scpi_get_float(sdi->conn,
621 (*config->scpi_dialect)[SCPI_CMD_GET_TIMEBASE],
622 &tmp_float) != SR_OK)
625 if (sr_scpi_get_string(sdi->conn,
626 (*config->scpi_dialect)[SCPI_CMD_GET_TIMEBASE],
630 if (array_float_get(tmp_str, ARRAY_AND_SIZE(timebases), &i) != SR_OK) {
632 sr_err("Could not determine array index for time base.");
639 if (sr_scpi_get_float(sdi->conn,
640 (*config->scpi_dialect)[SCPI_CMD_GET_HORIZ_TRIGGERPOS],
641 &tmp_float) != SR_OK)
643 state->horiz_triggerpos = tmp_float /
644 (((double) (*config->timebases)[state->timebase][0] /
645 (*config->timebases)[state->timebase][1]) * config->num_xdivs);
646 state->horiz_triggerpos -= 0.5;
647 state->horiz_triggerpos *= -1;
649 if (scope_state_get_array_option(sdi->conn,
650 (*config->scpi_dialect)[SCPI_CMD_GET_TRIGGER_SOURCE],
651 config->trigger_sources, &state->trigger_source) != SR_OK)
654 if (scope_state_get_array_option(sdi->conn,
655 (*config->scpi_dialect)[SCPI_CMD_GET_TRIGGER_SLOPE],
656 config->trigger_slopes, &state->trigger_slope) != SR_OK)
659 if (hmo_update_sample_rate(sdi) != SR_OK)
662 sr_info("Fetching finished.");
664 scope_state_dump(config, state);
669 static struct scope_state *scope_state_new(const struct scope_config *config)
671 struct scope_state *state;
673 state = g_malloc0(sizeof(struct scope_state));
674 state->analog_channels = g_malloc0_n(config->analog_channels,
675 sizeof(struct analog_channel_state));
676 state->digital_channels = g_malloc0_n(
677 config->digital_channels, sizeof(gboolean));
678 state->digital_pods = g_malloc0_n(config->digital_pods,
684 SR_PRIV void hmo_scope_state_free(struct scope_state *state)
686 g_free(state->analog_channels);
687 g_free(state->digital_channels);
688 g_free(state->digital_pods);
692 SR_PRIV int hmo_init_device(struct sr_dev_inst *sdi)
696 unsigned int i, j, group;
697 struct sr_channel *ch;
698 struct dev_context *devc;
703 /* Find the exact model. */
704 for (i = 0; i < ARRAY_SIZE(scope_models); i++) {
705 for (j = 0; scope_models[i].name[j]; j++) {
706 if (!strcmp(sdi->model, scope_models[i].name[j])) {
711 if (model_index != -1)
715 if (model_index == -1) {
716 sr_dbg("Unsupported HMO device.");
720 devc->analog_groups = g_malloc0(sizeof(struct sr_channel_group*) *
721 scope_models[model_index].analog_channels);
723 devc->digital_groups = g_malloc0(sizeof(struct sr_channel_group*) *
724 scope_models[model_index].digital_pods);
726 /* Add analog channels. */
727 for (i = 0; i < scope_models[model_index].analog_channels; i++) {
728 ch = sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE,
729 (*scope_models[model_index].analog_names)[i]);
731 devc->analog_groups[i] = g_malloc0(sizeof(struct sr_channel_group));
733 devc->analog_groups[i]->name = g_strdup(
734 (char *)(*scope_models[model_index].analog_names)[i]);
735 devc->analog_groups[i]->channels = g_slist_append(NULL, ch);
737 sdi->channel_groups = g_slist_append(sdi->channel_groups,
738 devc->analog_groups[i]);
741 /* Add digital channel groups. */
742 for (i = 0; i < scope_models[model_index].digital_pods; i++) {
743 g_snprintf(tmp, 25, "POD%d", i);
745 devc->digital_groups[i] = g_malloc0(sizeof(struct sr_channel_group));
747 devc->digital_groups[i]->name = g_strdup(tmp);
748 sdi->channel_groups = g_slist_append(sdi->channel_groups,
749 devc->digital_groups[i]);
752 /* Add digital channels. */
753 for (i = 0; i < scope_models[model_index].digital_channels; i++) {
754 ch = sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE,
755 (*scope_models[model_index].digital_names)[i]);
758 devc->digital_groups[group]->channels = g_slist_append(
759 devc->digital_groups[group]->channels, ch);
762 devc->model_config = &scope_models[model_index];
763 devc->frame_limit = 0;
765 if (!(devc->model_state = scope_state_new(devc->model_config)))
766 return SR_ERR_MALLOC;
771 /* Queue data of one channel group, for later submission. */
772 SR_PRIV void hmo_queue_logic_data(struct dev_context *devc,
773 size_t group, GByteArray *pod_data)
778 size_t idx, logic_step;
781 * Upon first invocation, allocate the array which can hold the
782 * combined logic data for all channels. Assume that each channel
783 * will yield an identical number of samples per receive call.
785 * As a poor man's safety measure: (Silently) skip processing
786 * for unexpected sample counts, and ignore samples for
787 * unexpected channel groups. Don't bother with complicated
788 * resize logic, considering that many models only support one
789 * pod, and the most capable supported models have two pods of
790 * identical size. We haven't yet seen any "odd" configuration.
792 if (!devc->logic_data) {
793 size = pod_data->len * devc->pod_count;
794 store = g_byte_array_sized_new(size);
795 memset(store->data, 0, size);
796 store = g_byte_array_set_size(store, size);
797 devc->logic_data = store;
799 store = devc->logic_data;
800 size = store->len / devc->pod_count;
801 if (size != pod_data->len)
803 if (group >= devc->pod_count)
808 * Fold the data of the most recently received channel group into
809 * the storage, where data resides for all channels combined.
811 logic_data = store->data;
813 logic_step = devc->pod_count;
814 for (idx = 0; idx < pod_data->len; idx++) {
815 *logic_data = pod_data->data[idx];
816 logic_data += logic_step;
820 /* Submit data for all channels, after the individual groups got collected. */
821 SR_PRIV void hmo_send_logic_packet(struct sr_dev_inst *sdi,
822 struct dev_context *devc)
824 struct sr_datafeed_packet packet;
825 struct sr_datafeed_logic logic;
827 if (!devc->logic_data)
830 logic.data = devc->logic_data->data;
831 logic.length = devc->logic_data->len;
832 logic.unitsize = devc->pod_count;
834 packet.type = SR_DF_LOGIC;
835 packet.payload = &logic;
837 sr_session_send(sdi, &packet);
840 /* Undo previous resource allocation. */
841 SR_PRIV void hmo_cleanup_logic_data(struct dev_context *devc)
844 if (devc->logic_data) {
845 g_byte_array_free(devc->logic_data, TRUE);
846 devc->logic_data = NULL;
849 * Keep 'pod_count'! It's required when more frames will be
850 * received, and does not harm when kept after acquisition.
854 SR_PRIV int hmo_receive_data(int fd, int revents, void *cb_data)
856 struct sr_channel *ch;
857 struct sr_dev_inst *sdi;
858 struct dev_context *devc;
859 struct scope_state *state;
860 struct sr_datafeed_packet packet;
862 struct sr_datafeed_analog analog;
863 struct sr_analog_encoding encoding;
864 struct sr_analog_meaning meaning;
865 struct sr_analog_spec spec;
866 struct sr_datafeed_logic logic;
874 if (!(sdi = cb_data))
877 if (!(devc = sdi->priv))
880 /* Although this is correct in general, the USBTMC libusb implementation
881 * currently does not generate an event prior to the first read. Often
882 * it is ok to start reading just after the 50ms timeout. See bug #785.
883 if (revents != G_IO_IN)
887 ch = devc->current_channel->data;
888 state = devc->model_state;
891 * Send "frame begin" packet upon reception of data for the
892 * first enabled channel.
894 if (devc->current_channel == devc->enabled_channels) {
895 packet.type = SR_DF_FRAME_BEGIN;
896 sr_session_send(sdi, &packet);
900 * Pass on the received data of the channel(s).
903 case SR_CHANNEL_ANALOG:
904 if (sr_scpi_get_block(sdi->conn, NULL, &data) != SR_OK) {
906 g_byte_array_free(data, TRUE);
911 packet.type = SR_DF_ANALOG;
913 analog.data = data->data;
914 analog.num_samples = data->len / sizeof(float);
915 analog.encoding = &encoding;
916 analog.meaning = &meaning;
919 encoding.unitsize = sizeof(float);
920 encoding.is_signed = TRUE;
921 encoding.is_float = TRUE;
922 #ifdef WORDS_BIGENDIAN
923 encoding.is_bigendian = TRUE;
925 encoding.is_bigendian = FALSE;
927 /* TODO: Use proper 'digits' value for this device (and its modes). */
929 encoding.is_digits_decimal = FALSE;
930 encoding.scale.p = 1;
931 encoding.scale.q = 1;
932 encoding.offset.p = 0;
933 encoding.offset.q = 1;
934 if (state->analog_channels[ch->index].probe_unit == 'V') {
935 meaning.mq = SR_MQ_VOLTAGE;
936 meaning.unit = SR_UNIT_VOLT;
938 meaning.mq = SR_MQ_CURRENT;
939 meaning.unit = SR_UNIT_AMPERE;
942 meaning.channels = g_slist_append(NULL, ch);
943 /* TODO: Use proper 'digits' value for this device (and its modes). */
944 spec.spec_digits = 2;
945 packet.payload = &analog;
946 sr_session_send(sdi, &packet);
947 g_slist_free(meaning.channels);
948 g_byte_array_free(data, TRUE);
951 case SR_CHANNEL_LOGIC:
952 if (sr_scpi_get_block(sdi->conn, NULL, &data) != SR_OK) {
958 * If only data from the first pod is involved in the
959 * acquisition, then the raw input bytes can get passed
960 * forward for performance reasons. When the second pod
961 * is involved (either alone, or in combination with the
962 * first pod), then the received bytes need to be put
963 * into memory in such a layout that all channel groups
964 * get combined, and a unitsize larger than a single byte
965 * applies. The "queue" logic transparently copes with
966 * any such configuration. This works around the lack
967 * of support for "meaning" to logic data, which is used
968 * above for analog data.
970 if (devc->pod_count == 1) {
971 packet.type = SR_DF_LOGIC;
972 logic.data = data->data;
973 logic.length = data->len;
975 packet.payload = &logic;
976 sr_session_send(sdi, &packet);
978 group = ch->index / 8;
979 hmo_queue_logic_data(devc, group, data);
982 g_byte_array_free(data, TRUE);
986 sr_err("Invalid channel type.");
991 * Advance to the next enabled channel. When data for all enabled
992 * channels was received, then flush potentially queued logic data,
993 * and send the "frame end" packet.
995 if (devc->current_channel->next) {
996 devc->current_channel = devc->current_channel->next;
997 hmo_request_data(sdi);
1000 hmo_send_logic_packet(sdi, devc);
1003 * Release the logic data storage after each frame. This copes
1004 * with sample counts that differ in length per frame. -- Is
1005 * this a real constraint when acquiring multiple frames with
1006 * identical device settings?
1008 hmo_cleanup_logic_data(devc);
1010 packet.type = SR_DF_FRAME_END;
1011 sr_session_send(sdi, &packet);
1014 * End of frame was reached. Stop acquisition after the specified
1015 * number of frames, or continue reception by starting over at
1016 * the first enabled channel.
1018 if (++devc->num_frames == devc->frame_limit) {
1019 sr_dev_acquisition_stop(sdi);
1020 hmo_cleanup_logic_data(devc);
1022 devc->current_channel = devc->enabled_channels;
1023 hmo_request_data(sdi);