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
28 #include <libsigrok/libsigrok.h>
29 #include "libsigrok-internal.h"
31 #define LOG_PREFIX "demo"
33 #define DEFAULT_NUM_LOGIC_CHANNELS 8
34 #define DEFAULT_NUM_ANALOG_CHANNELS 4
36 /* The size in bytes of chunks to send through the session bus. */
37 #define LOGIC_BUFSIZE 4096
38 /* Size of the analog pattern space per channel. */
39 #define ANALOG_BUFSIZE 4096
41 #define DEFAULT_ANALOG_AMPLITUDE 10
42 #define ANALOG_SAMPLES_PER_PERIOD 20
44 /* Logic patterns we can generate. */
47 * Spells "sigrok" across 8 channels using '0's (with '1's as
48 * "background") when displayed using the 'bits' output format.
49 * The pattern is repeated every 8 channels, shifted to the right
54 /** Pseudo-random values on all channels. */
58 * Incrementing number across 8 channels. The pattern is repeated
59 * every 8 channels, shifted to the right in time by one bit.
63 /** All channels have a low logic state. */
66 /** All channels have a high logic state. */
70 /* Analog patterns we can generate. */
81 static const char *logic_pattern_str[] = {
89 static const char *analog_pattern_str[] = {
99 float pattern_data[ANALOG_BUFSIZE];
100 unsigned int num_samples;
101 struct sr_datafeed_analog_old packet;
102 float avg_val; /* Average value */
103 unsigned num_avgs; /* Number of samples averaged */
106 /* Private, per-device-instance driver context. */
108 uint64_t cur_samplerate;
109 uint64_t limit_samples;
111 uint64_t sent_samples;
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[] = {
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);
182 static void generate_analog_pattern(struct analog_gen *ag, uint64_t sample_rate)
186 unsigned int num_samples, i;
189 sr_dbg("Generating %s pattern.", analog_pattern_str[ag->pattern]);
191 num_samples = ANALOG_BUFSIZE / sizeof(float);
193 switch (ag->pattern) {
195 value = ag->amplitude;
197 for (i = 0; i < num_samples; i++) {
202 ag->pattern_data[i] = value;
204 ag->num_samples = last_end;
207 frequency = (double) sample_rate / ANALOG_SAMPLES_PER_PERIOD;
209 /* Make sure the number of samples we put out is an integer
210 * multiple of our period size */
211 /* FIXME we actually need only one period. A ringbuffer would be
213 while (num_samples % ANALOG_SAMPLES_PER_PERIOD != 0)
216 for (i = 0; i < num_samples; i++) {
217 t = (double) i / (double) sample_rate;
218 ag->pattern_data[i] = ag->amplitude *
219 sin(2 * G_PI * frequency * t);
222 ag->num_samples = num_samples;
224 case PATTERN_TRIANGLE:
225 frequency = (double) sample_rate / ANALOG_SAMPLES_PER_PERIOD;
227 while (num_samples % ANALOG_SAMPLES_PER_PERIOD != 0)
230 for (i = 0; i < num_samples; i++) {
231 t = (double) i / (double) sample_rate;
232 ag->pattern_data[i] = (2 * ag->amplitude / G_PI) *
233 asin(sin(2 * G_PI * frequency * t));
236 ag->num_samples = num_samples;
238 case PATTERN_SAWTOOTH:
239 frequency = (double) sample_rate / ANALOG_SAMPLES_PER_PERIOD;
241 while (num_samples % ANALOG_SAMPLES_PER_PERIOD != 0)
244 for (i = 0; i < num_samples; i++) {
245 t = (double) i / (double) sample_rate;
246 ag->pattern_data[i] = 2 * ag->amplitude *
247 ((t * frequency) - floor(0.5f + t * frequency));
250 ag->num_samples = num_samples;
255 static GSList *scan(struct sr_dev_driver *di, GSList *options)
257 struct drv_context *drvc;
258 struct dev_context *devc;
259 struct sr_dev_inst *sdi;
260 struct sr_channel *ch;
261 struct sr_channel_group *cg, *acg;
262 struct sr_config *src;
263 struct analog_gen *ag;
265 int num_logic_channels, num_analog_channels, pattern, i;
266 char channel_name[16];
270 num_logic_channels = DEFAULT_NUM_LOGIC_CHANNELS;
271 num_analog_channels = DEFAULT_NUM_ANALOG_CHANNELS;
272 for (l = options; l; l = l->next) {
275 case SR_CONF_NUM_LOGIC_CHANNELS:
276 num_logic_channels = g_variant_get_int32(src->data);
278 case SR_CONF_NUM_ANALOG_CHANNELS:
279 num_analog_channels = g_variant_get_int32(src->data);
286 sdi = g_malloc0(sizeof(struct sr_dev_inst));
287 sdi->status = SR_ST_INACTIVE;
288 sdi->model = g_strdup("Demo device");
291 devc = g_malloc0(sizeof(struct dev_context));
292 devc->cur_samplerate = SR_KHZ(200);
293 devc->num_logic_channels = num_logic_channels;
294 devc->logic_unitsize = (devc->num_logic_channels + 7) / 8;
295 devc->logic_pattern = PATTERN_SIGROK;
296 devc->num_analog_channels = num_analog_channels;
298 if (num_logic_channels > 0) {
299 /* Logic channels, all in one channel group. */
300 cg = g_malloc0(sizeof(struct sr_channel_group));
301 cg->name = g_strdup("Logic");
302 for (i = 0; i < num_logic_channels; i++) {
303 sprintf(channel_name, "D%d", i);
304 ch = sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE, channel_name);
305 cg->channels = g_slist_append(cg->channels, ch);
307 sdi->channel_groups = g_slist_append(NULL, cg);
310 /* Analog channels, channel groups and pattern generators. */
311 if (num_analog_channels > 0) {
313 /* An "Analog" channel group with all analog channels in it. */
314 acg = g_malloc0(sizeof(struct sr_channel_group));
315 acg->name = g_strdup("Analog");
316 sdi->channel_groups = g_slist_append(sdi->channel_groups, acg);
318 devc->ch_ag = g_hash_table_new(g_direct_hash, g_direct_equal);
319 for (i = 0; i < num_analog_channels; i++) {
320 snprintf(channel_name, 16, "A%d", i);
321 ch = sr_channel_new(sdi, i + num_logic_channels, SR_CHANNEL_ANALOG,
323 acg->channels = g_slist_append(acg->channels, ch);
325 /* Every analog channel gets its own channel group as well. */
326 cg = g_malloc0(sizeof(struct sr_channel_group));
327 cg->name = g_strdup(channel_name);
328 cg->channels = g_slist_append(NULL, ch);
329 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
331 /* Every channel gets a generator struct. */
332 ag = g_malloc(sizeof(struct analog_gen));
333 ag->amplitude = DEFAULT_ANALOG_AMPLITUDE;
334 ag->packet.channels = cg->channels;
336 ag->packet.mqflags = 0;
337 ag->packet.unit = SR_UNIT_VOLT;
338 ag->packet.data = ag->pattern_data;
339 ag->pattern = pattern;
342 g_hash_table_insert(devc->ch_ag, ch, ag);
344 if (++pattern == ARRAY_SIZE(analog_pattern_str))
350 devices = g_slist_append(devices, sdi);
351 drvc->instances = g_slist_append(drvc->instances, sdi);
356 static int dev_open(struct sr_dev_inst *sdi)
358 sdi->status = SR_ST_ACTIVE;
363 static int dev_close(struct sr_dev_inst *sdi)
365 sdi->status = SR_ST_INACTIVE;
370 static void clear_helper(void *priv)
372 struct dev_context *devc;
378 /* Analog generators. */
379 g_hash_table_iter_init(&iter, devc->ch_ag);
380 while (g_hash_table_iter_next(&iter, NULL, &value))
382 g_hash_table_unref(devc->ch_ag);
386 static int dev_clear(const struct sr_dev_driver *di)
388 return std_dev_clear(di, clear_helper);
391 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
392 const struct sr_channel_group *cg)
394 struct dev_context *devc;
395 struct sr_channel *ch;
396 struct analog_gen *ag;
404 case SR_CONF_SAMPLERATE:
405 *data = g_variant_new_uint64(devc->cur_samplerate);
407 case SR_CONF_LIMIT_SAMPLES:
408 *data = g_variant_new_uint64(devc->limit_samples);
410 case SR_CONF_LIMIT_MSEC:
411 *data = g_variant_new_uint64(devc->limit_msec);
413 case SR_CONF_AVERAGING:
414 *data = g_variant_new_boolean(devc->avg);
416 case SR_CONF_AVG_SAMPLES:
417 *data = g_variant_new_uint64(devc->avg_samples);
419 case SR_CONF_PATTERN_MODE:
421 return SR_ERR_CHANNEL_GROUP;
422 /* Any channel in the group will do. */
423 ch = cg->channels->data;
424 if (ch->type == SR_CHANNEL_LOGIC) {
425 pattern = devc->logic_pattern;
426 *data = g_variant_new_string(logic_pattern_str[pattern]);
427 } else if (ch->type == SR_CHANNEL_ANALOG) {
428 ag = g_hash_table_lookup(devc->ch_ag, ch);
429 pattern = ag->pattern;
430 *data = g_variant_new_string(analog_pattern_str[pattern]);
434 case SR_CONF_AMPLITUDE:
436 return SR_ERR_CHANNEL_GROUP;
437 /* Any channel in the group will do. */
438 ch = cg->channels->data;
439 if (ch->type != SR_CHANNEL_ANALOG)
441 ag = g_hash_table_lookup(devc->ch_ag, ch);
442 *data = g_variant_new_double(ag->amplitude);
451 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
452 const struct sr_channel_group *cg)
454 struct dev_context *devc;
455 struct analog_gen *ag;
456 struct sr_channel *ch;
458 int logic_pattern, analog_pattern, ret;
464 if (sdi->status != SR_ST_ACTIVE)
465 return SR_ERR_DEV_CLOSED;
469 case SR_CONF_SAMPLERATE:
470 devc->cur_samplerate = g_variant_get_uint64(data);
472 case SR_CONF_LIMIT_SAMPLES:
473 devc->limit_msec = 0;
474 devc->limit_samples = g_variant_get_uint64(data);
476 case SR_CONF_LIMIT_MSEC:
477 devc->limit_msec = g_variant_get_uint64(data);
478 devc->limit_samples = 0;
480 case SR_CONF_AVERAGING:
481 devc->avg = g_variant_get_boolean(data);
482 sr_dbg("%s averaging", devc->avg ? "Enabling" : "Disabling");
484 case SR_CONF_AVG_SAMPLES:
485 devc->avg_samples = g_variant_get_uint64(data);
486 sr_dbg("Setting averaging rate to %" PRIu64, devc->avg_samples);
488 case SR_CONF_PATTERN_MODE:
490 return SR_ERR_CHANNEL_GROUP;
491 stropt = g_variant_get_string(data, NULL);
492 logic_pattern = analog_pattern = -1;
493 for (i = 0; i < ARRAY_SIZE(logic_pattern_str); i++) {
494 if (!strcmp(stropt, logic_pattern_str[i])) {
499 for (i = 0; i < ARRAY_SIZE(analog_pattern_str); i++) {
500 if (!strcmp(stropt, analog_pattern_str[i])) {
505 if (logic_pattern == -1 && analog_pattern == -1)
507 for (l = cg->channels; l; l = l->next) {
509 if (ch->type == SR_CHANNEL_LOGIC) {
510 if (logic_pattern == -1)
512 sr_dbg("Setting logic pattern to %s",
513 logic_pattern_str[logic_pattern]);
514 devc->logic_pattern = logic_pattern;
515 /* Might as well do this now, these are static. */
516 if (logic_pattern == PATTERN_ALL_LOW)
517 memset(devc->logic_data, 0x00, LOGIC_BUFSIZE);
518 else if (logic_pattern == PATTERN_ALL_HIGH)
519 memset(devc->logic_data, 0xff, LOGIC_BUFSIZE);
520 } else if (ch->type == SR_CHANNEL_ANALOG) {
521 if (analog_pattern == -1)
523 sr_dbg("Setting analog pattern for channel %s to %s",
524 ch->name, analog_pattern_str[analog_pattern]);
525 ag = g_hash_table_lookup(devc->ch_ag, ch);
526 ag->pattern = analog_pattern;
531 case SR_CONF_AMPLITUDE:
533 return SR_ERR_CHANNEL_GROUP;
534 for (l = cg->channels; l; l = l->next) {
536 if (ch->type != SR_CHANNEL_ANALOG)
538 ag = g_hash_table_lookup(devc->ch_ag, ch);
539 ag->amplitude = g_variant_get_double(data);
549 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
550 const struct sr_channel_group *cg)
552 struct sr_channel *ch;
556 if (key == SR_CONF_SCAN_OPTIONS) {
557 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
558 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
562 if (key == SR_CONF_DEVICE_OPTIONS && !sdi) {
563 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
564 drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
573 case SR_CONF_DEVICE_OPTIONS:
574 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
575 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
577 case SR_CONF_SAMPLERATE:
578 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
579 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates,
580 ARRAY_SIZE(samplerates), sizeof(uint64_t));
581 g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
582 *data = g_variant_builder_end(&gvb);
588 ch = cg->channels->data;
590 case SR_CONF_DEVICE_OPTIONS:
591 if (ch->type == SR_CHANNEL_LOGIC)
592 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
593 devopts_cg_logic, ARRAY_SIZE(devopts_cg_logic),
595 else if (ch->type == SR_CHANNEL_ANALOG) {
596 if (strcmp(cg->name, "Analog") == 0)
597 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
598 devopts_cg_analog_group, ARRAY_SIZE(devopts_cg_analog_group),
601 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
602 devopts_cg_analog_channel, ARRAY_SIZE(devopts_cg_analog_channel),
608 case SR_CONF_PATTERN_MODE:
609 /* The analog group (with all 4 channels) shall not have a pattern property. */
610 if (strcmp(cg->name, "Analog") == 0)
613 if (ch->type == SR_CHANNEL_LOGIC)
614 *data = g_variant_new_strv(logic_pattern_str,
615 ARRAY_SIZE(logic_pattern_str));
616 else if (ch->type == SR_CHANNEL_ANALOG)
617 *data = g_variant_new_strv(analog_pattern_str,
618 ARRAY_SIZE(analog_pattern_str));
630 static void logic_generator(struct sr_dev_inst *sdi, uint64_t size)
632 struct dev_context *devc;
638 switch (devc->logic_pattern) {
640 memset(devc->logic_data, 0x00, size);
641 for (i = 0; i < size; i += devc->logic_unitsize) {
642 for (j = 0; j < devc->logic_unitsize; j++) {
643 pat = pattern_sigrok[(devc->step + j) % sizeof(pattern_sigrok)] >> 1;
644 devc->logic_data[i + j] = ~pat;
650 for (i = 0; i < size; i++)
651 devc->logic_data[i] = (uint8_t)(rand() & 0xff);
654 for (i = 0; i < size; i++) {
655 for (j = 0; j < devc->logic_unitsize; j++) {
656 devc->logic_data[i + j] = devc->step;
661 case PATTERN_ALL_LOW:
662 case PATTERN_ALL_HIGH:
663 /* These were set when the pattern mode was selected. */
666 sr_err("Unknown pattern: %d.", devc->logic_pattern);
671 static void send_analog_packet(struct analog_gen *ag,
672 struct sr_dev_inst *sdi,
673 uint64_t *analog_sent,
675 uint64_t analog_todo)
677 struct sr_datafeed_packet packet;
678 struct dev_context *devc;
679 uint64_t sending_now, to_avg;
684 packet.type = SR_DF_ANALOG_OLD;
685 packet.payload = &ag->packet;
688 ag_pattern_pos = analog_pos % ag->num_samples;
689 sending_now = MIN(analog_todo, ag->num_samples-ag_pattern_pos);
690 ag->packet.data = ag->pattern_data + ag_pattern_pos;
691 ag->packet.num_samples = sending_now;
692 sr_session_send(sdi, &packet);
694 /* Whichever channel group gets there first. */
695 *analog_sent = MAX(*analog_sent, sending_now);
697 ag_pattern_pos = analog_pos % ag->num_samples;
698 to_avg = MIN(analog_todo, ag->num_samples-ag_pattern_pos);
700 for (i = 0; i < to_avg; i++) {
701 ag->avg_val = (ag->avg_val +
703 ag_pattern_pos + i)) / 2;
705 /* Time to send averaged data? */
706 if (devc->avg_samples > 0 &&
707 ag->num_avgs >= devc->avg_samples)
711 if (devc->avg_samples == 0) {
712 /* We're averaging all the samples, so wait with
713 * sending until the very end.
715 *analog_sent = ag->num_avgs;
720 ag->packet.data = &ag->avg_val;
721 ag->packet.num_samples = 1;
723 sr_session_send(sdi, &packet);
724 *analog_sent = ag->num_avgs;
731 /* Callback handling data */
732 static int prepare_data(int fd, int revents, void *cb_data)
734 struct sr_dev_inst *sdi;
735 struct dev_context *devc;
736 struct sr_datafeed_packet packet;
737 struct sr_datafeed_logic logic;
738 struct analog_gen *ag;
741 uint64_t samples_todo, logic_done, analog_done, analog_sent, sending_now;
742 int64_t elapsed_us, limit_us, todo_us;
751 if (devc->cur_samplerate <= 0
752 || (devc->num_logic_channels <= 0
753 && devc->num_analog_channels <= 0)) {
754 dev_acquisition_stop(sdi);
755 return G_SOURCE_CONTINUE;
758 /* What time span should we send samples for? */
759 elapsed_us = g_get_monotonic_time() - devc->start_us;
760 limit_us = 1000 * devc->limit_msec;
761 if (limit_us > 0 && limit_us < elapsed_us)
762 todo_us = MAX(0, limit_us - devc->spent_us);
764 todo_us = MAX(0, elapsed_us - devc->spent_us);
766 /* How many samples are outstanding since the last round? */
767 samples_todo = (todo_us * devc->cur_samplerate + G_USEC_PER_SEC - 1)
769 if (devc->limit_samples > 0) {
770 if (devc->limit_samples < devc->sent_samples)
772 else if (devc->limit_samples - devc->sent_samples < samples_todo)
773 samples_todo = devc->limit_samples - devc->sent_samples;
775 /* Calculate the actual time covered by this run back from the sample
776 * count, rounded towards zero. This avoids getting stuck on a too-low
777 * time delta with no samples being sent due to round-off.
779 todo_us = samples_todo * G_USEC_PER_SEC / devc->cur_samplerate;
781 logic_done = devc->num_logic_channels > 0 ? 0 : samples_todo;
782 analog_done = devc->num_analog_channels > 0 ? 0 : samples_todo;
784 while (logic_done < samples_todo || analog_done < samples_todo) {
786 if (logic_done < samples_todo) {
787 sending_now = MIN(samples_todo - logic_done,
788 LOGIC_BUFSIZE / devc->logic_unitsize);
789 logic_generator(sdi, sending_now * devc->logic_unitsize);
790 packet.type = SR_DF_LOGIC;
791 packet.payload = &logic;
792 logic.length = sending_now * devc->logic_unitsize;
793 logic.unitsize = devc->logic_unitsize;
794 logic.data = devc->logic_data;
795 sr_session_send(sdi, &packet);
796 logic_done += sending_now;
799 /* Analog, one channel at a time */
800 if (analog_done < samples_todo) {
803 g_hash_table_iter_init(&iter, devc->ch_ag);
804 while (g_hash_table_iter_next(&iter, NULL, &value)) {
805 send_analog_packet(value, sdi, &analog_sent,
806 devc->sent_samples + analog_done,
807 samples_todo - analog_done);
809 analog_done += analog_sent;
812 /* At this point, both logic_done and analog_done should be
813 * exactly equal to samples_todo, or else.
815 if (logic_done != samples_todo || analog_done != samples_todo) {
816 sr_err("BUG: Sample count mismatch.");
817 return G_SOURCE_REMOVE;
819 devc->sent_samples += samples_todo;
820 devc->spent_us += todo_us;
822 if ((devc->limit_samples > 0 && devc->sent_samples >= devc->limit_samples)
823 || (limit_us > 0 && devc->spent_us >= limit_us)) {
825 /* If we're averaging everything - now is the time to send data */
826 if (devc->avg_samples == 0) {
827 g_hash_table_iter_init(&iter, devc->ch_ag);
828 while (g_hash_table_iter_next(&iter, NULL, &value)) {
830 packet.type = SR_DF_ANALOG_OLD;
831 packet.payload = &ag->packet;
832 ag->packet.data = &ag->avg_val;
833 ag->packet.num_samples = 1;
834 sr_session_send(sdi, &packet);
837 sr_dbg("Requested number of samples reached.");
838 dev_acquisition_stop(sdi);
841 return G_SOURCE_CONTINUE;
844 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
846 struct dev_context *devc;
850 if (sdi->status != SR_ST_ACTIVE)
851 return SR_ERR_DEV_CLOSED;
854 devc->sent_samples = 0;
856 g_hash_table_iter_init(&iter, devc->ch_ag);
857 while (g_hash_table_iter_next(&iter, NULL, &value))
858 generate_analog_pattern(value, devc->cur_samplerate);
860 sr_session_source_add(sdi->session, -1, 0, 100,
861 prepare_data, (struct sr_dev_inst *)sdi);
863 std_session_send_df_header(sdi, LOG_PREFIX);
865 /* We use this timestamp to decide how many more samples to send. */
866 devc->start_us = g_get_monotonic_time();
872 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
874 sr_dbg("Stopping acquisition.");
875 sr_session_source_remove(sdi->session, -1);
876 std_session_send_df_end(sdi, LOG_PREFIX);
881 SR_PRIV struct sr_dev_driver demo_driver_info = {
883 .longname = "Demo driver and pattern generator",
886 .cleanup = std_cleanup,
888 .dev_list = std_dev_list,
889 .dev_clear = dev_clear,
890 .config_get = config_get,
891 .config_set = config_set,
892 .config_list = config_list,
893 .dev_open = dev_open,
894 .dev_close = dev_close,
895 .dev_acquisition_start = dev_acquisition_start,
896 .dev_acquisition_stop = dev_acquisition_stop,