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 static int dev_acquisition_stop(struct sr_dev_inst *sdi);
180 static void generate_analog_pattern(struct analog_gen *ag, uint64_t sample_rate)
184 unsigned int num_samples, i;
187 sr_dbg("Generating %s pattern.", analog_pattern_str[ag->pattern]);
189 num_samples = ANALOG_BUFSIZE / sizeof(float);
191 switch (ag->pattern) {
193 value = ag->amplitude;
195 for (i = 0; i < num_samples; i++) {
200 ag->pattern_data[i] = value;
202 ag->num_samples = last_end;
205 frequency = (double) sample_rate / ANALOG_SAMPLES_PER_PERIOD;
207 /* Make sure the number of samples we put out is an integer
208 * multiple of our period size */
209 /* FIXME we actually need only one period. A ringbuffer would be
211 while (num_samples % ANALOG_SAMPLES_PER_PERIOD != 0)
214 for (i = 0; i < num_samples; i++) {
215 t = (double) i / (double) sample_rate;
216 ag->pattern_data[i] = ag->amplitude *
217 sin(2 * G_PI * frequency * t);
220 ag->num_samples = num_samples;
222 case PATTERN_TRIANGLE:
223 frequency = (double) sample_rate / ANALOG_SAMPLES_PER_PERIOD;
225 while (num_samples % ANALOG_SAMPLES_PER_PERIOD != 0)
228 for (i = 0; i < num_samples; i++) {
229 t = (double) i / (double) sample_rate;
230 ag->pattern_data[i] = (2 * ag->amplitude / G_PI) *
231 asin(sin(2 * G_PI * frequency * t));
234 ag->num_samples = num_samples;
236 case PATTERN_SAWTOOTH:
237 frequency = (double) sample_rate / ANALOG_SAMPLES_PER_PERIOD;
239 while (num_samples % ANALOG_SAMPLES_PER_PERIOD != 0)
242 for (i = 0; i < num_samples; i++) {
243 t = (double) i / (double) sample_rate;
244 ag->pattern_data[i] = 2 * ag->amplitude *
245 ((t * frequency) - floor(0.5f + t * frequency));
248 ag->num_samples = num_samples;
253 static GSList *scan(struct sr_dev_driver *di, GSList *options)
255 struct dev_context *devc;
256 struct sr_dev_inst *sdi;
257 struct sr_channel *ch;
258 struct sr_channel_group *cg, *acg;
259 struct sr_config *src;
260 struct analog_gen *ag;
262 int num_logic_channels, num_analog_channels, pattern, i;
263 char channel_name[16];
265 num_logic_channels = DEFAULT_NUM_LOGIC_CHANNELS;
266 num_analog_channels = DEFAULT_NUM_ANALOG_CHANNELS;
267 for (l = options; l; l = l->next) {
270 case SR_CONF_NUM_LOGIC_CHANNELS:
271 num_logic_channels = g_variant_get_int32(src->data);
273 case SR_CONF_NUM_ANALOG_CHANNELS:
274 num_analog_channels = g_variant_get_int32(src->data);
279 sdi = g_malloc0(sizeof(struct sr_dev_inst));
280 sdi->status = SR_ST_INACTIVE;
281 sdi->model = g_strdup("Demo device");
283 devc = g_malloc0(sizeof(struct dev_context));
284 devc->cur_samplerate = SR_KHZ(200);
285 devc->num_logic_channels = num_logic_channels;
286 devc->logic_unitsize = (devc->num_logic_channels + 7) / 8;
287 devc->logic_pattern = PATTERN_SIGROK;
288 devc->num_analog_channels = num_analog_channels;
290 if (num_logic_channels > 0) {
291 /* Logic channels, all in one channel group. */
292 cg = g_malloc0(sizeof(struct sr_channel_group));
293 cg->name = g_strdup("Logic");
294 for (i = 0; i < num_logic_channels; i++) {
295 sprintf(channel_name, "D%d", i);
296 ch = sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE, channel_name);
297 cg->channels = g_slist_append(cg->channels, ch);
299 sdi->channel_groups = g_slist_append(NULL, cg);
302 /* Analog channels, channel groups and pattern generators. */
303 if (num_analog_channels > 0) {
305 /* An "Analog" channel group with all analog channels in it. */
306 acg = g_malloc0(sizeof(struct sr_channel_group));
307 acg->name = g_strdup("Analog");
308 sdi->channel_groups = g_slist_append(sdi->channel_groups, acg);
310 devc->ch_ag = g_hash_table_new(g_direct_hash, g_direct_equal);
311 for (i = 0; i < num_analog_channels; i++) {
312 snprintf(channel_name, 16, "A%d", i);
313 ch = sr_channel_new(sdi, i + num_logic_channels, SR_CHANNEL_ANALOG,
315 acg->channels = g_slist_append(acg->channels, ch);
317 /* Every analog channel gets its own channel group as well. */
318 cg = g_malloc0(sizeof(struct sr_channel_group));
319 cg->name = g_strdup(channel_name);
320 cg->channels = g_slist_append(NULL, ch);
321 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
323 /* Every channel gets a generator struct. */
324 ag = g_malloc(sizeof(struct analog_gen));
325 ag->amplitude = DEFAULT_ANALOG_AMPLITUDE;
326 ag->packet.channels = cg->channels;
328 ag->packet.mqflags = 0;
329 ag->packet.unit = SR_UNIT_VOLT;
330 ag->packet.data = ag->pattern_data;
331 ag->pattern = pattern;
334 g_hash_table_insert(devc->ch_ag, ch, ag);
336 if (++pattern == ARRAY_SIZE(analog_pattern_str))
343 return std_scan_complete(di, g_slist_append(NULL, sdi));
346 static int dev_open(struct sr_dev_inst *sdi)
348 sdi->status = SR_ST_ACTIVE;
353 static int dev_close(struct sr_dev_inst *sdi)
355 sdi->status = SR_ST_INACTIVE;
360 static void clear_helper(void *priv)
362 struct dev_context *devc;
368 /* Analog generators. */
369 g_hash_table_iter_init(&iter, devc->ch_ag);
370 while (g_hash_table_iter_next(&iter, NULL, &value))
372 g_hash_table_unref(devc->ch_ag);
376 static int dev_clear(const struct sr_dev_driver *di)
378 return std_dev_clear(di, clear_helper);
381 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
382 const struct sr_channel_group *cg)
384 struct dev_context *devc;
385 struct sr_channel *ch;
386 struct analog_gen *ag;
394 case SR_CONF_SAMPLERATE:
395 *data = g_variant_new_uint64(devc->cur_samplerate);
397 case SR_CONF_LIMIT_SAMPLES:
398 *data = g_variant_new_uint64(devc->limit_samples);
400 case SR_CONF_LIMIT_MSEC:
401 *data = g_variant_new_uint64(devc->limit_msec);
403 case SR_CONF_AVERAGING:
404 *data = g_variant_new_boolean(devc->avg);
406 case SR_CONF_AVG_SAMPLES:
407 *data = g_variant_new_uint64(devc->avg_samples);
409 case SR_CONF_PATTERN_MODE:
411 return SR_ERR_CHANNEL_GROUP;
412 /* Any channel in the group will do. */
413 ch = cg->channels->data;
414 if (ch->type == SR_CHANNEL_LOGIC) {
415 pattern = devc->logic_pattern;
416 *data = g_variant_new_string(logic_pattern_str[pattern]);
417 } else if (ch->type == SR_CHANNEL_ANALOG) {
418 ag = g_hash_table_lookup(devc->ch_ag, ch);
419 pattern = ag->pattern;
420 *data = g_variant_new_string(analog_pattern_str[pattern]);
424 case SR_CONF_AMPLITUDE:
426 return SR_ERR_CHANNEL_GROUP;
427 /* Any channel in the group will do. */
428 ch = cg->channels->data;
429 if (ch->type != SR_CHANNEL_ANALOG)
431 ag = g_hash_table_lookup(devc->ch_ag, ch);
432 *data = g_variant_new_double(ag->amplitude);
441 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
442 const struct sr_channel_group *cg)
444 struct dev_context *devc;
445 struct analog_gen *ag;
446 struct sr_channel *ch;
448 int logic_pattern, analog_pattern, ret;
454 if (sdi->status != SR_ST_ACTIVE)
455 return SR_ERR_DEV_CLOSED;
459 case SR_CONF_SAMPLERATE:
460 devc->cur_samplerate = g_variant_get_uint64(data);
462 case SR_CONF_LIMIT_SAMPLES:
463 devc->limit_msec = 0;
464 devc->limit_samples = g_variant_get_uint64(data);
466 case SR_CONF_LIMIT_MSEC:
467 devc->limit_msec = g_variant_get_uint64(data);
468 devc->limit_samples = 0;
470 case SR_CONF_AVERAGING:
471 devc->avg = g_variant_get_boolean(data);
472 sr_dbg("%s averaging", devc->avg ? "Enabling" : "Disabling");
474 case SR_CONF_AVG_SAMPLES:
475 devc->avg_samples = g_variant_get_uint64(data);
476 sr_dbg("Setting averaging rate to %" PRIu64, devc->avg_samples);
478 case SR_CONF_PATTERN_MODE:
480 return SR_ERR_CHANNEL_GROUP;
481 stropt = g_variant_get_string(data, NULL);
482 logic_pattern = analog_pattern = -1;
483 for (i = 0; i < ARRAY_SIZE(logic_pattern_str); i++) {
484 if (!strcmp(stropt, logic_pattern_str[i])) {
489 for (i = 0; i < ARRAY_SIZE(analog_pattern_str); i++) {
490 if (!strcmp(stropt, analog_pattern_str[i])) {
495 if (logic_pattern == -1 && analog_pattern == -1)
497 for (l = cg->channels; l; l = l->next) {
499 if (ch->type == SR_CHANNEL_LOGIC) {
500 if (logic_pattern == -1)
502 sr_dbg("Setting logic pattern to %s",
503 logic_pattern_str[logic_pattern]);
504 devc->logic_pattern = logic_pattern;
505 /* Might as well do this now, these are static. */
506 if (logic_pattern == PATTERN_ALL_LOW)
507 memset(devc->logic_data, 0x00, LOGIC_BUFSIZE);
508 else if (logic_pattern == PATTERN_ALL_HIGH)
509 memset(devc->logic_data, 0xff, LOGIC_BUFSIZE);
510 } else if (ch->type == SR_CHANNEL_ANALOG) {
511 if (analog_pattern == -1)
513 sr_dbg("Setting analog pattern for channel %s to %s",
514 ch->name, analog_pattern_str[analog_pattern]);
515 ag = g_hash_table_lookup(devc->ch_ag, ch);
516 ag->pattern = analog_pattern;
521 case SR_CONF_AMPLITUDE:
523 return SR_ERR_CHANNEL_GROUP;
524 for (l = cg->channels; l; l = l->next) {
526 if (ch->type != SR_CHANNEL_ANALOG)
528 ag = g_hash_table_lookup(devc->ch_ag, ch);
529 ag->amplitude = g_variant_get_double(data);
539 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
540 const struct sr_channel_group *cg)
542 struct sr_channel *ch;
546 if (key == SR_CONF_SCAN_OPTIONS) {
547 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
548 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
552 if (key == SR_CONF_DEVICE_OPTIONS && !sdi) {
553 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
554 drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
563 case SR_CONF_DEVICE_OPTIONS:
564 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
565 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
567 case SR_CONF_SAMPLERATE:
568 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
569 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates,
570 ARRAY_SIZE(samplerates), sizeof(uint64_t));
571 g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
572 *data = g_variant_builder_end(&gvb);
578 ch = cg->channels->data;
580 case SR_CONF_DEVICE_OPTIONS:
581 if (ch->type == SR_CHANNEL_LOGIC)
582 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
583 devopts_cg_logic, ARRAY_SIZE(devopts_cg_logic),
585 else if (ch->type == SR_CHANNEL_ANALOG) {
586 if (strcmp(cg->name, "Analog") == 0)
587 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
588 devopts_cg_analog_group, ARRAY_SIZE(devopts_cg_analog_group),
591 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
592 devopts_cg_analog_channel, ARRAY_SIZE(devopts_cg_analog_channel),
598 case SR_CONF_PATTERN_MODE:
599 /* The analog group (with all 4 channels) shall not have a pattern property. */
600 if (strcmp(cg->name, "Analog") == 0)
603 if (ch->type == SR_CHANNEL_LOGIC)
604 *data = g_variant_new_strv(logic_pattern_str,
605 ARRAY_SIZE(logic_pattern_str));
606 else if (ch->type == SR_CHANNEL_ANALOG)
607 *data = g_variant_new_strv(analog_pattern_str,
608 ARRAY_SIZE(analog_pattern_str));
620 static void logic_generator(struct sr_dev_inst *sdi, uint64_t size)
622 struct dev_context *devc;
628 switch (devc->logic_pattern) {
630 memset(devc->logic_data, 0x00, size);
631 for (i = 0; i < size; i += devc->logic_unitsize) {
632 for (j = 0; j < devc->logic_unitsize; j++) {
633 pat = pattern_sigrok[(devc->step + j) % sizeof(pattern_sigrok)] >> 1;
634 devc->logic_data[i + j] = ~pat;
640 for (i = 0; i < size; i++)
641 devc->logic_data[i] = (uint8_t)(rand() & 0xff);
644 for (i = 0; i < size; i++) {
645 for (j = 0; j < devc->logic_unitsize; j++) {
646 devc->logic_data[i + j] = devc->step;
651 case PATTERN_ALL_LOW:
652 case PATTERN_ALL_HIGH:
653 /* These were set when the pattern mode was selected. */
656 sr_err("Unknown pattern: %d.", devc->logic_pattern);
661 static void send_analog_packet(struct analog_gen *ag,
662 struct sr_dev_inst *sdi,
663 uint64_t *analog_sent,
665 uint64_t analog_todo)
667 struct sr_datafeed_packet packet;
668 struct dev_context *devc;
669 uint64_t sending_now, to_avg;
674 packet.type = SR_DF_ANALOG_OLD;
675 packet.payload = &ag->packet;
678 ag_pattern_pos = analog_pos % ag->num_samples;
679 sending_now = MIN(analog_todo, ag->num_samples-ag_pattern_pos);
680 ag->packet.data = ag->pattern_data + ag_pattern_pos;
681 ag->packet.num_samples = sending_now;
682 sr_session_send(sdi, &packet);
684 /* Whichever channel group gets there first. */
685 *analog_sent = MAX(*analog_sent, sending_now);
687 ag_pattern_pos = analog_pos % ag->num_samples;
688 to_avg = MIN(analog_todo, ag->num_samples-ag_pattern_pos);
690 for (i = 0; i < to_avg; i++) {
691 ag->avg_val = (ag->avg_val +
693 ag_pattern_pos + i)) / 2;
695 /* Time to send averaged data? */
696 if (devc->avg_samples > 0 &&
697 ag->num_avgs >= devc->avg_samples)
701 if (devc->avg_samples == 0) {
702 /* We're averaging all the samples, so wait with
703 * sending until the very end.
705 *analog_sent = ag->num_avgs;
710 ag->packet.data = &ag->avg_val;
711 ag->packet.num_samples = 1;
713 sr_session_send(sdi, &packet);
714 *analog_sent = ag->num_avgs;
721 /* Callback handling data */
722 static int prepare_data(int fd, int revents, void *cb_data)
724 struct sr_dev_inst *sdi;
725 struct dev_context *devc;
726 struct sr_datafeed_packet packet;
727 struct sr_datafeed_logic logic;
728 struct analog_gen *ag;
731 uint64_t samples_todo, logic_done, analog_done, analog_sent, sending_now;
732 int64_t elapsed_us, limit_us, todo_us;
741 if (devc->cur_samplerate <= 0
742 || (devc->num_logic_channels <= 0
743 && devc->num_analog_channels <= 0)) {
744 dev_acquisition_stop(sdi);
745 return G_SOURCE_CONTINUE;
748 /* What time span should we send samples for? */
749 elapsed_us = g_get_monotonic_time() - devc->start_us;
750 limit_us = 1000 * devc->limit_msec;
751 if (limit_us > 0 && limit_us < elapsed_us)
752 todo_us = MAX(0, limit_us - devc->spent_us);
754 todo_us = MAX(0, elapsed_us - devc->spent_us);
756 /* How many samples are outstanding since the last round? */
757 samples_todo = (todo_us * devc->cur_samplerate + G_USEC_PER_SEC - 1)
759 if (devc->limit_samples > 0) {
760 if (devc->limit_samples < devc->sent_samples)
762 else if (devc->limit_samples - devc->sent_samples < samples_todo)
763 samples_todo = devc->limit_samples - devc->sent_samples;
765 /* Calculate the actual time covered by this run back from the sample
766 * count, rounded towards zero. This avoids getting stuck on a too-low
767 * time delta with no samples being sent due to round-off.
769 todo_us = samples_todo * G_USEC_PER_SEC / devc->cur_samplerate;
771 logic_done = devc->num_logic_channels > 0 ? 0 : samples_todo;
772 analog_done = devc->num_analog_channels > 0 ? 0 : samples_todo;
774 while (logic_done < samples_todo || analog_done < samples_todo) {
776 if (logic_done < samples_todo) {
777 sending_now = MIN(samples_todo - logic_done,
778 LOGIC_BUFSIZE / devc->logic_unitsize);
779 logic_generator(sdi, sending_now * devc->logic_unitsize);
780 packet.type = SR_DF_LOGIC;
781 packet.payload = &logic;
782 logic.length = sending_now * devc->logic_unitsize;
783 logic.unitsize = devc->logic_unitsize;
784 logic.data = devc->logic_data;
785 sr_session_send(sdi, &packet);
786 logic_done += sending_now;
789 /* Analog, one channel at a time */
790 if (analog_done < samples_todo) {
793 g_hash_table_iter_init(&iter, devc->ch_ag);
794 while (g_hash_table_iter_next(&iter, NULL, &value)) {
795 send_analog_packet(value, sdi, &analog_sent,
796 devc->sent_samples + analog_done,
797 samples_todo - analog_done);
799 analog_done += analog_sent;
802 /* At this point, both logic_done and analog_done should be
803 * exactly equal to samples_todo, or else.
805 if (logic_done != samples_todo || analog_done != samples_todo) {
806 sr_err("BUG: Sample count mismatch.");
807 return G_SOURCE_REMOVE;
809 devc->sent_samples += samples_todo;
810 devc->spent_us += todo_us;
812 if ((devc->limit_samples > 0 && devc->sent_samples >= devc->limit_samples)
813 || (limit_us > 0 && devc->spent_us >= limit_us)) {
815 /* If we're averaging everything - now is the time to send data */
816 if (devc->avg_samples == 0) {
817 g_hash_table_iter_init(&iter, devc->ch_ag);
818 while (g_hash_table_iter_next(&iter, NULL, &value)) {
820 packet.type = SR_DF_ANALOG_OLD;
821 packet.payload = &ag->packet;
822 ag->packet.data = &ag->avg_val;
823 ag->packet.num_samples = 1;
824 sr_session_send(sdi, &packet);
827 sr_dbg("Requested number of samples reached.");
828 dev_acquisition_stop(sdi);
831 return G_SOURCE_CONTINUE;
834 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
836 struct dev_context *devc;
840 if (sdi->status != SR_ST_ACTIVE)
841 return SR_ERR_DEV_CLOSED;
844 devc->sent_samples = 0;
846 g_hash_table_iter_init(&iter, devc->ch_ag);
847 while (g_hash_table_iter_next(&iter, NULL, &value))
848 generate_analog_pattern(value, devc->cur_samplerate);
850 sr_session_source_add(sdi->session, -1, 0, 100,
851 prepare_data, (struct sr_dev_inst *)sdi);
853 std_session_send_df_header(sdi, LOG_PREFIX);
855 /* We use this timestamp to decide how many more samples to send. */
856 devc->start_us = g_get_monotonic_time();
862 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
864 sr_dbg("Stopping acquisition.");
865 sr_session_source_remove(sdi->session, -1);
866 std_session_send_df_end(sdi, LOG_PREFIX);
871 static struct sr_dev_driver demo_driver_info = {
873 .longname = "Demo driver and pattern generator",
876 .cleanup = std_cleanup,
878 .dev_list = std_dev_list,
879 .dev_clear = dev_clear,
880 .config_get = config_get,
881 .config_set = config_set,
882 .config_list = config_list,
883 .dev_open = dev_open,
884 .dev_close = dev_close,
885 .dev_acquisition_start = dev_acquisition_start,
886 .dev_acquisition_stop = dev_acquisition_stop,
889 SR_REGISTER_DEV_DRIVER(demo_driver_info);