2 * This file is part of the libsigrok project.
4 * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
5 * Copyright (C) 2011 Olivier Fauchon <olivier@aixmarseille.com>
6 * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
7 * Copyright (C) 2015 Bartosz Golaszewski <bgolaszewski@baylibre.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
27 #include <libsigrok/libsigrok.h>
28 #include "libsigrok-internal.h"
30 #define LOG_PREFIX "demo"
32 #define DEFAULT_NUM_LOGIC_CHANNELS 8
33 #define DEFAULT_NUM_ANALOG_CHANNELS 4
35 /* The size in bytes of chunks to send through the session bus. */
36 #define LOGIC_BUFSIZE 4096
37 /* Size of the analog pattern space per channel. */
38 #define ANALOG_BUFSIZE 4096
40 #define DEFAULT_ANALOG_AMPLITUDE 25
41 #define ANALOG_SAMPLES_PER_PERIOD 20
43 /* Logic patterns we can generate. */
46 * Spells "sigrok" across 8 channels using '0's (with '1's as
47 * "background") when displayed using the 'bits' output format.
48 * The pattern is repeated every 8 channels, shifted to the right
53 /** Pseudo-random values on all channels. */
57 * Incrementing number across 8 channels. The pattern is repeated
58 * every 8 channels, shifted to the right in time by one bit.
62 /** All channels have a low logic state. */
65 /** All channels have a high logic state. */
69 /* Analog patterns we can generate. */
80 static const char *logic_pattern_str[] = {
88 static const char *analog_pattern_str[] = {
98 float pattern_data[ANALOG_BUFSIZE];
99 unsigned int num_samples;
100 struct sr_datafeed_analog packet;
101 float avg_val; /* Average value */
102 unsigned num_avgs; /* Number of samples averaged */
105 /* Private, per-device-instance driver context. */
107 uint64_t cur_samplerate;
109 uint64_t limit_samples;
111 uint64_t logic_counter;
112 uint64_t analog_counter;
116 int32_t num_logic_channels;
117 unsigned int logic_unitsize;
118 /* There is only ever one logic channel group, so its pattern goes here. */
119 uint8_t logic_pattern;
120 unsigned char logic_data[LOGIC_BUFSIZE];
122 int32_t num_analog_channels;
124 gboolean avg; /* True if averaging is enabled */
125 uint64_t avg_samples;
128 static const uint32_t drvopts[] = {
130 SR_CONF_LOGIC_ANALYZER,
131 SR_CONF_OSCILLOSCOPE,
134 static const uint32_t scanopts[] = {
135 SR_CONF_NUM_LOGIC_CHANNELS,
136 SR_CONF_NUM_ANALOG_CHANNELS,
139 static const uint32_t devopts[] = {
140 SR_CONF_CONTINUOUS | SR_CONF_SET,
141 SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
142 SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET,
143 SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
144 SR_CONF_AVERAGING | SR_CONF_GET | SR_CONF_SET,
145 SR_CONF_AVG_SAMPLES | SR_CONF_GET | SR_CONF_SET,
148 static const uint32_t devopts_cg_logic[] = {
149 SR_CONF_PATTERN_MODE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
152 static const uint32_t devopts_cg_analog_group[] = {
153 SR_CONF_AMPLITUDE | SR_CONF_GET | SR_CONF_SET,
156 static const uint32_t devopts_cg_analog_channel[] = {
157 SR_CONF_PATTERN_MODE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
158 SR_CONF_AMPLITUDE | SR_CONF_GET | SR_CONF_SET,
161 static const uint64_t samplerates[] = {
167 static const uint8_t pattern_sigrok[] = {
168 0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
169 0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
170 0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
171 0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
172 0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
173 0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
174 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
175 0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
178 SR_PRIV struct sr_dev_driver demo_driver_info;
180 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
182 static int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
184 return std_init(sr_ctx, di, LOG_PREFIX);
187 static void generate_analog_pattern(struct analog_gen *ag, uint64_t sample_rate)
191 unsigned int num_samples, i;
194 sr_dbg("Generating %s pattern.", analog_pattern_str[ag->pattern]);
196 num_samples = ANALOG_BUFSIZE / sizeof(float);
198 switch (ag->pattern) {
200 value = ag->amplitude;
202 for (i = 0; i < num_samples; i++) {
207 ag->pattern_data[i] = value;
209 ag->num_samples = last_end;
212 frequency = (double) sample_rate / ANALOG_SAMPLES_PER_PERIOD;
214 /* Make sure the number of samples we put out is an integer
215 * multiple of our period size */
216 /* FIXME we actually need only one period. A ringbuffer would be
218 while (num_samples % ANALOG_SAMPLES_PER_PERIOD != 0)
221 for (i = 0; i < num_samples; i++) {
222 t = (double) i / (double) sample_rate;
223 ag->pattern_data[i] = ag->amplitude *
224 sin(2 * G_PI * frequency * t);
227 ag->num_samples = num_samples;
229 case PATTERN_TRIANGLE:
230 frequency = (double) sample_rate / ANALOG_SAMPLES_PER_PERIOD;
232 while (num_samples % ANALOG_SAMPLES_PER_PERIOD != 0)
235 for (i = 0; i < num_samples; i++) {
236 t = (double) i / (double) sample_rate;
237 ag->pattern_data[i] = (2 * ag->amplitude / G_PI) *
238 asin(sin(2 * G_PI * frequency * t));
241 ag->num_samples = num_samples;
243 case PATTERN_SAWTOOTH:
244 frequency = (double) sample_rate / ANALOG_SAMPLES_PER_PERIOD;
246 while (num_samples % ANALOG_SAMPLES_PER_PERIOD != 0)
249 for (i = 0; i < num_samples; i++) {
250 t = (double) i / (double) sample_rate;
251 ag->pattern_data[i] = 2 * ag->amplitude *
252 ((t * frequency) - floor(0.5f + t * frequency));
255 ag->num_samples = num_samples;
260 static GSList *scan(struct sr_dev_driver *di, GSList *options)
262 struct drv_context *drvc;
263 struct dev_context *devc;
264 struct sr_dev_inst *sdi;
265 struct sr_channel *ch;
266 struct sr_channel_group *cg, *acg;
267 struct sr_config *src;
268 struct analog_gen *ag;
270 int num_logic_channels, num_analog_channels, pattern, i;
271 char channel_name[16];
275 num_logic_channels = DEFAULT_NUM_LOGIC_CHANNELS;
276 num_analog_channels = DEFAULT_NUM_ANALOG_CHANNELS;
277 for (l = options; l; l = l->next) {
280 case SR_CONF_NUM_LOGIC_CHANNELS:
281 num_logic_channels = g_variant_get_int32(src->data);
283 case SR_CONF_NUM_ANALOG_CHANNELS:
284 num_analog_channels = g_variant_get_int32(src->data);
291 sdi = g_malloc0(sizeof(struct sr_dev_inst));
292 sdi->status = SR_ST_ACTIVE;
293 sdi->model = g_strdup("Demo device");
296 devc = g_malloc(sizeof(struct dev_context));
297 devc->cur_samplerate = SR_KHZ(200);
298 devc->limit_samples = 0;
299 devc->limit_msec = 0;
301 devc->continuous = FALSE;
302 devc->num_logic_channels = num_logic_channels;
303 devc->logic_unitsize = (devc->num_logic_channels + 7) / 8;
304 devc->logic_pattern = PATTERN_SIGROK;
305 devc->num_analog_channels = num_analog_channels;
307 devc->avg_samples = 0;
309 /* Logic channels, all in one channel group. */
310 cg = g_malloc0(sizeof(struct sr_channel_group));
311 cg->name = g_strdup("Logic");
312 for (i = 0; i < num_logic_channels; i++) {
313 sprintf(channel_name, "D%d", i);
314 ch = sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE, channel_name);
315 cg->channels = g_slist_append(cg->channels, ch);
317 sdi->channel_groups = g_slist_append(NULL, cg);
319 /* Analog channels, channel groups and pattern generators. */
321 /* An "Analog" channel group with all analog channels in it. */
322 acg = g_malloc0(sizeof(struct sr_channel_group));
323 acg->name = g_strdup("Analog");
324 sdi->channel_groups = g_slist_append(sdi->channel_groups, acg);
326 devc->ch_ag = g_hash_table_new(g_direct_hash, g_direct_equal);
327 for (i = 0; i < num_analog_channels; i++) {
328 snprintf(channel_name, 16, "A%d", i);
329 ch = sr_channel_new(sdi, i + num_logic_channels, SR_CHANNEL_ANALOG,
331 acg->channels = g_slist_append(acg->channels, ch);
333 /* Every analog channel gets its own channel group as well. */
334 cg = g_malloc0(sizeof(struct sr_channel_group));
335 cg->name = g_strdup(channel_name);
336 cg->channels = g_slist_append(NULL, ch);
337 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
339 /* Every channel gets a generator struct. */
340 ag = g_malloc(sizeof(struct analog_gen));
341 ag->amplitude = DEFAULT_ANALOG_AMPLITUDE;
342 ag->packet.channels = cg->channels;
344 ag->packet.mqflags = 0;
345 ag->packet.unit = SR_UNIT_VOLT;
346 ag->packet.data = ag->pattern_data;
347 ag->pattern = pattern;
350 g_hash_table_insert(devc->ch_ag, ch, ag);
352 if (++pattern == ARRAY_SIZE(analog_pattern_str))
357 devices = g_slist_append(devices, sdi);
358 drvc->instances = g_slist_append(drvc->instances, sdi);
363 static GSList *dev_list(const struct sr_dev_driver *di)
365 return ((struct drv_context *)(di->context))->instances;
368 static int dev_open(struct sr_dev_inst *sdi)
370 sdi->status = SR_ST_ACTIVE;
375 static int dev_close(struct sr_dev_inst *sdi)
377 sdi->status = SR_ST_INACTIVE;
382 static void clear_helper(void *priv)
384 struct dev_context *devc;
390 /* Analog generators. */
391 g_hash_table_iter_init(&iter, devc->ch_ag);
392 while (g_hash_table_iter_next(&iter, NULL, &value))
394 g_hash_table_unref(devc->ch_ag);
398 static int cleanup(const struct sr_dev_driver *di)
400 return std_dev_clear(di, clear_helper);
403 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
404 const struct sr_channel_group *cg)
406 struct dev_context *devc;
407 struct sr_channel *ch;
408 struct analog_gen *ag;
416 case SR_CONF_SAMPLERATE:
417 *data = g_variant_new_uint64(devc->cur_samplerate);
419 case SR_CONF_LIMIT_SAMPLES:
420 *data = g_variant_new_uint64(devc->limit_samples);
422 case SR_CONF_LIMIT_MSEC:
423 *data = g_variant_new_uint64(devc->limit_msec);
425 case SR_CONF_AVERAGING:
426 *data = g_variant_new_boolean(devc->avg);
428 case SR_CONF_AVG_SAMPLES:
429 *data = g_variant_new_uint64(devc->avg_samples);
431 case SR_CONF_PATTERN_MODE:
433 return SR_ERR_CHANNEL_GROUP;
434 /* Any channel in the group will do. */
435 ch = cg->channels->data;
436 if (ch->type == SR_CHANNEL_LOGIC) {
437 pattern = devc->logic_pattern;
438 *data = g_variant_new_string(logic_pattern_str[pattern]);
439 } else if (ch->type == SR_CHANNEL_ANALOG) {
440 ag = g_hash_table_lookup(devc->ch_ag, ch);
441 pattern = ag->pattern;
442 *data = g_variant_new_string(analog_pattern_str[pattern]);
446 case SR_CONF_AMPLITUDE:
448 return SR_ERR_CHANNEL_GROUP;
449 /* Any channel in the group will do. */
450 ch = cg->channels->data;
451 if (ch->type != SR_CHANNEL_ANALOG)
453 ag = g_hash_table_lookup(devc->ch_ag, ch);
454 *data = g_variant_new_double(ag->amplitude);
463 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
464 const struct sr_channel_group *cg)
466 struct dev_context *devc;
467 struct analog_gen *ag;
468 struct sr_channel *ch;
470 int logic_pattern, analog_pattern, ret;
476 if (sdi->status != SR_ST_ACTIVE)
477 return SR_ERR_DEV_CLOSED;
481 case SR_CONF_SAMPLERATE:
482 devc->cur_samplerate = g_variant_get_uint64(data);
484 case SR_CONF_LIMIT_SAMPLES:
485 devc->limit_msec = 0;
486 devc->limit_samples = g_variant_get_uint64(data);
488 case SR_CONF_LIMIT_MSEC:
489 devc->limit_msec = g_variant_get_uint64(data);
490 devc->limit_samples = 0;
492 case SR_CONF_AVERAGING:
493 devc->avg = g_variant_get_boolean(data);
494 sr_dbg("%s averaging", devc->avg ? "Enabling" : "Disabling");
496 case SR_CONF_AVG_SAMPLES:
497 devc->avg_samples = g_variant_get_uint64(data);
498 sr_dbg("Setting averaging rate to %" PRIu64, devc->avg_samples);
500 case SR_CONF_PATTERN_MODE:
502 return SR_ERR_CHANNEL_GROUP;
503 stropt = g_variant_get_string(data, NULL);
504 logic_pattern = analog_pattern = -1;
505 for (i = 0; i < ARRAY_SIZE(logic_pattern_str); i++) {
506 if (!strcmp(stropt, logic_pattern_str[i])) {
511 for (i = 0; i < ARRAY_SIZE(analog_pattern_str); i++) {
512 if (!strcmp(stropt, analog_pattern_str[i])) {
517 if (logic_pattern == -1 && analog_pattern == -1)
519 for (l = cg->channels; l; l = l->next) {
521 if (ch->type == SR_CHANNEL_LOGIC) {
522 if (logic_pattern == -1)
524 sr_dbg("Setting logic pattern to %s",
525 logic_pattern_str[logic_pattern]);
526 devc->logic_pattern = logic_pattern;
527 /* Might as well do this now, these are static. */
528 if (logic_pattern == PATTERN_ALL_LOW)
529 memset(devc->logic_data, 0x00, LOGIC_BUFSIZE);
530 else if (logic_pattern == PATTERN_ALL_HIGH)
531 memset(devc->logic_data, 0xff, LOGIC_BUFSIZE);
532 } else if (ch->type == SR_CHANNEL_ANALOG) {
533 if (analog_pattern == -1)
535 sr_dbg("Setting analog pattern for channel %s to %s",
536 ch->name, analog_pattern_str[analog_pattern]);
537 ag = g_hash_table_lookup(devc->ch_ag, ch);
538 ag->pattern = analog_pattern;
543 case SR_CONF_AMPLITUDE:
545 return SR_ERR_CHANNEL_GROUP;
546 for (l = cg->channels; l; l = l->next) {
548 if (ch->type != SR_CHANNEL_ANALOG)
550 ag = g_hash_table_lookup(devc->ch_ag, ch);
551 ag->amplitude = g_variant_get_double(data);
561 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
562 const struct sr_channel_group *cg)
564 struct sr_channel *ch;
568 if (key == SR_CONF_SCAN_OPTIONS) {
569 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
570 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
574 if (key == SR_CONF_DEVICE_OPTIONS && !sdi) {
575 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
576 drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
585 case SR_CONF_DEVICE_OPTIONS:
586 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
587 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
589 case SR_CONF_SAMPLERATE:
590 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
591 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates,
592 ARRAY_SIZE(samplerates), sizeof(uint64_t));
593 g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
594 *data = g_variant_builder_end(&gvb);
600 ch = cg->channels->data;
602 case SR_CONF_DEVICE_OPTIONS:
603 if (ch->type == SR_CHANNEL_LOGIC)
604 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
605 devopts_cg_logic, ARRAY_SIZE(devopts_cg_logic),
607 else if (ch->type == SR_CHANNEL_ANALOG) {
608 if (strcmp(cg->name, "Analog") == 0)
609 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
610 devopts_cg_analog_group, ARRAY_SIZE(devopts_cg_analog_group),
613 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
614 devopts_cg_analog_channel, ARRAY_SIZE(devopts_cg_analog_channel),
620 case SR_CONF_PATTERN_MODE:
621 /* The analog group (with all 4 channels) shall not have a pattern property. */
622 if (strcmp(cg->name, "Analog") == 0)
625 if (ch->type == SR_CHANNEL_LOGIC)
626 *data = g_variant_new_strv(logic_pattern_str,
627 ARRAY_SIZE(logic_pattern_str));
628 else if (ch->type == SR_CHANNEL_ANALOG)
629 *data = g_variant_new_strv(analog_pattern_str,
630 ARRAY_SIZE(analog_pattern_str));
642 static void logic_generator(struct sr_dev_inst *sdi, uint64_t size)
644 struct dev_context *devc;
650 switch (devc->logic_pattern) {
652 memset(devc->logic_data, 0x00, size);
653 for (i = 0; i < size; i += devc->logic_unitsize) {
654 for (j = 0; j < devc->logic_unitsize; j++) {
655 pat = pattern_sigrok[(devc->step + j) % sizeof(pattern_sigrok)] >> 1;
656 devc->logic_data[i + j] = ~pat;
662 for (i = 0; i < size; i++)
663 devc->logic_data[i] = (uint8_t)(rand() & 0xff);
666 for (i = 0; i < size; i++) {
667 for (j = 0; j < devc->logic_unitsize; j++) {
668 devc->logic_data[i + j] = devc->step;
673 case PATTERN_ALL_LOW:
674 case PATTERN_ALL_HIGH:
675 /* These were set when the pattern mode was selected. */
678 sr_err("Unknown pattern: %d.", devc->logic_pattern);
683 static void send_analog_packet(struct analog_gen *ag,
684 struct sr_dev_inst *sdi,
685 uint64_t *analog_sent,
686 uint64_t analog_todo)
688 struct sr_datafeed_packet packet;
689 struct dev_context *devc;
690 uint64_t sending_now, to_avg;
695 packet.type = SR_DF_ANALOG;
696 packet.payload = &ag->packet;
699 ag_pattern_pos = devc->analog_counter % ag->num_samples;
700 sending_now = MIN(analog_todo, ag->num_samples-ag_pattern_pos);
701 ag->packet.data = ag->pattern_data + ag_pattern_pos;
702 ag->packet.num_samples = sending_now;
703 sr_session_send(sdi, &packet);
705 /* Whichever channel group gets there first. */
706 *analog_sent = MAX(*analog_sent, sending_now);
708 ag_pattern_pos = devc->analog_counter % ag->num_samples;
709 to_avg = MIN(analog_todo, ag->num_samples-ag_pattern_pos);
711 for (i = 0; i < to_avg; i++) {
712 ag->avg_val = (ag->avg_val +
714 ag_pattern_pos + i)) / 2;
716 /* Time to send averaged data? */
717 if (devc->avg_samples > 0 &&
718 ag->num_avgs >= devc->avg_samples)
722 if (devc->avg_samples == 0) {
723 /* We're averaging all the samples, so wait with
724 * sending until the very end.
726 *analog_sent = ag->num_avgs;
731 ag->packet.data = &ag->avg_val;
732 ag->packet.num_samples = 1;
734 sr_session_send(sdi, &packet);
735 *analog_sent = ag->num_avgs;
742 /* Callback handling data */
743 static int prepare_data(int fd, int revents, void *cb_data)
745 struct sr_dev_inst *sdi;
746 struct dev_context *devc;
747 struct sr_datafeed_packet packet;
748 struct sr_datafeed_logic logic;
749 struct analog_gen *ag;
752 uint64_t logic_todo, analog_todo, expected_samplenum, analog_sent, sending_now;
753 int64_t time, elapsed;
760 logic_todo = analog_todo = 0;
762 /* How many samples should we have sent by now? */
763 time = g_get_monotonic_time();
764 elapsed = time - devc->starttime;
765 expected_samplenum = elapsed * devc->cur_samplerate / (1000 * 1000);
767 /* But never more than the limit, if there is one. */
768 if (!devc->continuous)
769 expected_samplenum = MIN(expected_samplenum, devc->limit_samples);
771 /* Of those, how many do we still have to send? */
772 if (devc->num_logic_channels && (devc->logic_counter < devc->limit_samples))
773 logic_todo = expected_samplenum - devc->logic_counter;
774 if (devc->num_analog_channels && (devc->analog_counter < devc->limit_samples))
775 analog_todo = expected_samplenum - devc->analog_counter;
777 while (logic_todo || analog_todo) {
779 if (logic_todo > 0) {
780 sending_now = MIN(logic_todo, LOGIC_BUFSIZE / devc->logic_unitsize);
781 logic_generator(sdi, sending_now * devc->logic_unitsize);
782 packet.type = SR_DF_LOGIC;
783 packet.payload = &logic;
784 logic.length = sending_now * devc->logic_unitsize;
785 logic.unitsize = devc->logic_unitsize;
786 logic.data = devc->logic_data;
787 sr_session_send(sdi, &packet);
788 logic_todo -= sending_now;
789 devc->logic_counter += sending_now;
792 /* Analog, one channel at a time */
793 if (analog_todo > 0) {
796 g_hash_table_iter_init(&iter, devc->ch_ag);
797 while (g_hash_table_iter_next(&iter, NULL, &value)) {
798 send_analog_packet(value, sdi,
799 &analog_sent, analog_todo);
801 analog_todo -= analog_sent;
802 devc->analog_counter += analog_sent;
806 if (!devc->continuous
807 && (!devc->num_logic_channels || devc->logic_counter >= devc->limit_samples)
808 && (!devc->num_analog_channels || devc->analog_counter >= devc->limit_samples)) {
809 /* If we're averaging everything - now is the time to send data */
810 if (devc->avg_samples == 0) {
811 g_hash_table_iter_init(&iter, devc->ch_ag);
812 while (g_hash_table_iter_next(&iter, NULL, &value)) {
814 packet.type = SR_DF_ANALOG;
815 packet.payload = &ag->packet;
816 ag->packet.data = &ag->avg_val;
817 ag->packet.num_samples = 1;
818 sr_session_send(sdi, &packet);
822 sr_dbg("Requested number of samples reached.");
823 dev_acquisition_stop(sdi, cb_data);
830 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
832 struct dev_context *devc;
838 if (sdi->status != SR_ST_ACTIVE)
839 return SR_ERR_DEV_CLOSED;
842 devc->continuous = !devc->limit_samples;
843 devc->logic_counter = devc->analog_counter = 0;
845 g_hash_table_iter_init(&iter, devc->ch_ag);
846 while (g_hash_table_iter_next(&iter, NULL, &value))
847 generate_analog_pattern(value, devc->cur_samplerate);
849 sr_session_source_add(sdi->session, -1, 0, 40, prepare_data, (void *)sdi);
851 /* Send header packet to the session bus. */
852 std_session_send_df_header(sdi, LOG_PREFIX);
854 /* We use this timestamp to decide how many more samples to send. */
855 devc->starttime = g_get_monotonic_time();
860 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
862 struct sr_datafeed_packet packet;
866 sr_dbg("Stopping acquisition.");
868 sr_session_source_remove(sdi->session, -1);
870 /* Send last packet. */
871 packet.type = SR_DF_END;
872 sr_session_send(sdi, &packet);
877 SR_PRIV struct sr_dev_driver demo_driver_info = {
879 .longname = "Demo driver and pattern generator",
884 .dev_list = dev_list,
886 .config_get = config_get,
887 .config_set = config_set,
888 .config_list = config_list,
889 .dev_open = dev_open,
890 .dev_close = dev_close,
891 .dev_acquisition_start = dev_acquisition_start,
892 .dev_acquisition_stop = dev_acquisition_stop,