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 drv_context *drvc;
256 struct dev_context *devc;
257 struct sr_dev_inst *sdi;
258 struct sr_channel *ch;
259 struct sr_channel_group *cg, *acg;
260 struct sr_config *src;
261 struct analog_gen *ag;
263 int num_logic_channels, num_analog_channels, pattern, i;
264 char channel_name[16];
268 num_logic_channels = DEFAULT_NUM_LOGIC_CHANNELS;
269 num_analog_channels = DEFAULT_NUM_ANALOG_CHANNELS;
270 for (l = options; l; l = l->next) {
273 case SR_CONF_NUM_LOGIC_CHANNELS:
274 num_logic_channels = g_variant_get_int32(src->data);
276 case SR_CONF_NUM_ANALOG_CHANNELS:
277 num_analog_channels = g_variant_get_int32(src->data);
284 sdi = g_malloc0(sizeof(struct sr_dev_inst));
285 sdi->status = SR_ST_INACTIVE;
286 sdi->model = g_strdup("Demo device");
288 devc = g_malloc0(sizeof(struct dev_context));
289 devc->cur_samplerate = SR_KHZ(200);
290 devc->num_logic_channels = num_logic_channels;
291 devc->logic_unitsize = (devc->num_logic_channels + 7) / 8;
292 devc->logic_pattern = PATTERN_SIGROK;
293 devc->num_analog_channels = num_analog_channels;
295 if (num_logic_channels > 0) {
296 /* Logic channels, all in one channel group. */
297 cg = g_malloc0(sizeof(struct sr_channel_group));
298 cg->name = g_strdup("Logic");
299 for (i = 0; i < num_logic_channels; i++) {
300 sprintf(channel_name, "D%d", i);
301 ch = sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE, channel_name);
302 cg->channels = g_slist_append(cg->channels, ch);
304 sdi->channel_groups = g_slist_append(NULL, cg);
307 /* Analog channels, channel groups and pattern generators. */
308 if (num_analog_channels > 0) {
310 /* An "Analog" channel group with all analog channels in it. */
311 acg = g_malloc0(sizeof(struct sr_channel_group));
312 acg->name = g_strdup("Analog");
313 sdi->channel_groups = g_slist_append(sdi->channel_groups, acg);
315 devc->ch_ag = g_hash_table_new(g_direct_hash, g_direct_equal);
316 for (i = 0; i < num_analog_channels; i++) {
317 snprintf(channel_name, 16, "A%d", i);
318 ch = sr_channel_new(sdi, i + num_logic_channels, SR_CHANNEL_ANALOG,
320 acg->channels = g_slist_append(acg->channels, ch);
322 /* Every analog channel gets its own channel group as well. */
323 cg = g_malloc0(sizeof(struct sr_channel_group));
324 cg->name = g_strdup(channel_name);
325 cg->channels = g_slist_append(NULL, ch);
326 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
328 /* Every channel gets a generator struct. */
329 ag = g_malloc(sizeof(struct analog_gen));
330 ag->amplitude = DEFAULT_ANALOG_AMPLITUDE;
331 ag->packet.channels = cg->channels;
333 ag->packet.mqflags = 0;
334 ag->packet.unit = SR_UNIT_VOLT;
335 ag->packet.data = ag->pattern_data;
336 ag->pattern = pattern;
339 g_hash_table_insert(devc->ch_ag, ch, ag);
341 if (++pattern == ARRAY_SIZE(analog_pattern_str))
347 devices = g_slist_append(devices, sdi);
349 return std_scan_complete(di, devices);
352 static int dev_open(struct sr_dev_inst *sdi)
354 sdi->status = SR_ST_ACTIVE;
359 static int dev_close(struct sr_dev_inst *sdi)
361 sdi->status = SR_ST_INACTIVE;
366 static void clear_helper(void *priv)
368 struct dev_context *devc;
374 /* Analog generators. */
375 g_hash_table_iter_init(&iter, devc->ch_ag);
376 while (g_hash_table_iter_next(&iter, NULL, &value))
378 g_hash_table_unref(devc->ch_ag);
382 static int dev_clear(const struct sr_dev_driver *di)
384 return std_dev_clear(di, clear_helper);
387 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
388 const struct sr_channel_group *cg)
390 struct dev_context *devc;
391 struct sr_channel *ch;
392 struct analog_gen *ag;
400 case SR_CONF_SAMPLERATE:
401 *data = g_variant_new_uint64(devc->cur_samplerate);
403 case SR_CONF_LIMIT_SAMPLES:
404 *data = g_variant_new_uint64(devc->limit_samples);
406 case SR_CONF_LIMIT_MSEC:
407 *data = g_variant_new_uint64(devc->limit_msec);
409 case SR_CONF_AVERAGING:
410 *data = g_variant_new_boolean(devc->avg);
412 case SR_CONF_AVG_SAMPLES:
413 *data = g_variant_new_uint64(devc->avg_samples);
415 case SR_CONF_PATTERN_MODE:
417 return SR_ERR_CHANNEL_GROUP;
418 /* Any channel in the group will do. */
419 ch = cg->channels->data;
420 if (ch->type == SR_CHANNEL_LOGIC) {
421 pattern = devc->logic_pattern;
422 *data = g_variant_new_string(logic_pattern_str[pattern]);
423 } else if (ch->type == SR_CHANNEL_ANALOG) {
424 ag = g_hash_table_lookup(devc->ch_ag, ch);
425 pattern = ag->pattern;
426 *data = g_variant_new_string(analog_pattern_str[pattern]);
430 case SR_CONF_AMPLITUDE:
432 return SR_ERR_CHANNEL_GROUP;
433 /* Any channel in the group will do. */
434 ch = cg->channels->data;
435 if (ch->type != SR_CHANNEL_ANALOG)
437 ag = g_hash_table_lookup(devc->ch_ag, ch);
438 *data = g_variant_new_double(ag->amplitude);
447 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
448 const struct sr_channel_group *cg)
450 struct dev_context *devc;
451 struct analog_gen *ag;
452 struct sr_channel *ch;
454 int logic_pattern, analog_pattern, ret;
460 if (sdi->status != SR_ST_ACTIVE)
461 return SR_ERR_DEV_CLOSED;
465 case SR_CONF_SAMPLERATE:
466 devc->cur_samplerate = g_variant_get_uint64(data);
468 case SR_CONF_LIMIT_SAMPLES:
469 devc->limit_msec = 0;
470 devc->limit_samples = g_variant_get_uint64(data);
472 case SR_CONF_LIMIT_MSEC:
473 devc->limit_msec = g_variant_get_uint64(data);
474 devc->limit_samples = 0;
476 case SR_CONF_AVERAGING:
477 devc->avg = g_variant_get_boolean(data);
478 sr_dbg("%s averaging", devc->avg ? "Enabling" : "Disabling");
480 case SR_CONF_AVG_SAMPLES:
481 devc->avg_samples = g_variant_get_uint64(data);
482 sr_dbg("Setting averaging rate to %" PRIu64, devc->avg_samples);
484 case SR_CONF_PATTERN_MODE:
486 return SR_ERR_CHANNEL_GROUP;
487 stropt = g_variant_get_string(data, NULL);
488 logic_pattern = analog_pattern = -1;
489 for (i = 0; i < ARRAY_SIZE(logic_pattern_str); i++) {
490 if (!strcmp(stropt, logic_pattern_str[i])) {
495 for (i = 0; i < ARRAY_SIZE(analog_pattern_str); i++) {
496 if (!strcmp(stropt, analog_pattern_str[i])) {
501 if (logic_pattern == -1 && analog_pattern == -1)
503 for (l = cg->channels; l; l = l->next) {
505 if (ch->type == SR_CHANNEL_LOGIC) {
506 if (logic_pattern == -1)
508 sr_dbg("Setting logic pattern to %s",
509 logic_pattern_str[logic_pattern]);
510 devc->logic_pattern = logic_pattern;
511 /* Might as well do this now, these are static. */
512 if (logic_pattern == PATTERN_ALL_LOW)
513 memset(devc->logic_data, 0x00, LOGIC_BUFSIZE);
514 else if (logic_pattern == PATTERN_ALL_HIGH)
515 memset(devc->logic_data, 0xff, LOGIC_BUFSIZE);
516 } else if (ch->type == SR_CHANNEL_ANALOG) {
517 if (analog_pattern == -1)
519 sr_dbg("Setting analog pattern for channel %s to %s",
520 ch->name, analog_pattern_str[analog_pattern]);
521 ag = g_hash_table_lookup(devc->ch_ag, ch);
522 ag->pattern = analog_pattern;
527 case SR_CONF_AMPLITUDE:
529 return SR_ERR_CHANNEL_GROUP;
530 for (l = cg->channels; l; l = l->next) {
532 if (ch->type != SR_CHANNEL_ANALOG)
534 ag = g_hash_table_lookup(devc->ch_ag, ch);
535 ag->amplitude = g_variant_get_double(data);
545 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
546 const struct sr_channel_group *cg)
548 struct sr_channel *ch;
552 if (key == SR_CONF_SCAN_OPTIONS) {
553 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
554 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
558 if (key == SR_CONF_DEVICE_OPTIONS && !sdi) {
559 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
560 drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
569 case SR_CONF_DEVICE_OPTIONS:
570 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
571 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
573 case SR_CONF_SAMPLERATE:
574 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
575 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates,
576 ARRAY_SIZE(samplerates), sizeof(uint64_t));
577 g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
578 *data = g_variant_builder_end(&gvb);
584 ch = cg->channels->data;
586 case SR_CONF_DEVICE_OPTIONS:
587 if (ch->type == SR_CHANNEL_LOGIC)
588 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
589 devopts_cg_logic, ARRAY_SIZE(devopts_cg_logic),
591 else if (ch->type == SR_CHANNEL_ANALOG) {
592 if (strcmp(cg->name, "Analog") == 0)
593 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
594 devopts_cg_analog_group, ARRAY_SIZE(devopts_cg_analog_group),
597 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
598 devopts_cg_analog_channel, ARRAY_SIZE(devopts_cg_analog_channel),
604 case SR_CONF_PATTERN_MODE:
605 /* The analog group (with all 4 channels) shall not have a pattern property. */
606 if (strcmp(cg->name, "Analog") == 0)
609 if (ch->type == SR_CHANNEL_LOGIC)
610 *data = g_variant_new_strv(logic_pattern_str,
611 ARRAY_SIZE(logic_pattern_str));
612 else if (ch->type == SR_CHANNEL_ANALOG)
613 *data = g_variant_new_strv(analog_pattern_str,
614 ARRAY_SIZE(analog_pattern_str));
626 static void logic_generator(struct sr_dev_inst *sdi, uint64_t size)
628 struct dev_context *devc;
634 switch (devc->logic_pattern) {
636 memset(devc->logic_data, 0x00, size);
637 for (i = 0; i < size; i += devc->logic_unitsize) {
638 for (j = 0; j < devc->logic_unitsize; j++) {
639 pat = pattern_sigrok[(devc->step + j) % sizeof(pattern_sigrok)] >> 1;
640 devc->logic_data[i + j] = ~pat;
646 for (i = 0; i < size; i++)
647 devc->logic_data[i] = (uint8_t)(rand() & 0xff);
650 for (i = 0; i < size; i++) {
651 for (j = 0; j < devc->logic_unitsize; j++) {
652 devc->logic_data[i + j] = devc->step;
657 case PATTERN_ALL_LOW:
658 case PATTERN_ALL_HIGH:
659 /* These were set when the pattern mode was selected. */
662 sr_err("Unknown pattern: %d.", devc->logic_pattern);
667 static void send_analog_packet(struct analog_gen *ag,
668 struct sr_dev_inst *sdi,
669 uint64_t *analog_sent,
671 uint64_t analog_todo)
673 struct sr_datafeed_packet packet;
674 struct dev_context *devc;
675 uint64_t sending_now, to_avg;
680 packet.type = SR_DF_ANALOG_OLD;
681 packet.payload = &ag->packet;
684 ag_pattern_pos = analog_pos % ag->num_samples;
685 sending_now = MIN(analog_todo, ag->num_samples-ag_pattern_pos);
686 ag->packet.data = ag->pattern_data + ag_pattern_pos;
687 ag->packet.num_samples = sending_now;
688 sr_session_send(sdi, &packet);
690 /* Whichever channel group gets there first. */
691 *analog_sent = MAX(*analog_sent, sending_now);
693 ag_pattern_pos = analog_pos % ag->num_samples;
694 to_avg = MIN(analog_todo, ag->num_samples-ag_pattern_pos);
696 for (i = 0; i < to_avg; i++) {
697 ag->avg_val = (ag->avg_val +
699 ag_pattern_pos + i)) / 2;
701 /* Time to send averaged data? */
702 if (devc->avg_samples > 0 &&
703 ag->num_avgs >= devc->avg_samples)
707 if (devc->avg_samples == 0) {
708 /* We're averaging all the samples, so wait with
709 * sending until the very end.
711 *analog_sent = ag->num_avgs;
716 ag->packet.data = &ag->avg_val;
717 ag->packet.num_samples = 1;
719 sr_session_send(sdi, &packet);
720 *analog_sent = ag->num_avgs;
727 /* Callback handling data */
728 static int prepare_data(int fd, int revents, void *cb_data)
730 struct sr_dev_inst *sdi;
731 struct dev_context *devc;
732 struct sr_datafeed_packet packet;
733 struct sr_datafeed_logic logic;
734 struct analog_gen *ag;
737 uint64_t samples_todo, logic_done, analog_done, analog_sent, sending_now;
738 int64_t elapsed_us, limit_us, todo_us;
747 if (devc->cur_samplerate <= 0
748 || (devc->num_logic_channels <= 0
749 && devc->num_analog_channels <= 0)) {
750 dev_acquisition_stop(sdi);
751 return G_SOURCE_CONTINUE;
754 /* What time span should we send samples for? */
755 elapsed_us = g_get_monotonic_time() - devc->start_us;
756 limit_us = 1000 * devc->limit_msec;
757 if (limit_us > 0 && limit_us < elapsed_us)
758 todo_us = MAX(0, limit_us - devc->spent_us);
760 todo_us = MAX(0, elapsed_us - devc->spent_us);
762 /* How many samples are outstanding since the last round? */
763 samples_todo = (todo_us * devc->cur_samplerate + G_USEC_PER_SEC - 1)
765 if (devc->limit_samples > 0) {
766 if (devc->limit_samples < devc->sent_samples)
768 else if (devc->limit_samples - devc->sent_samples < samples_todo)
769 samples_todo = devc->limit_samples - devc->sent_samples;
771 /* Calculate the actual time covered by this run back from the sample
772 * count, rounded towards zero. This avoids getting stuck on a too-low
773 * time delta with no samples being sent due to round-off.
775 todo_us = samples_todo * G_USEC_PER_SEC / devc->cur_samplerate;
777 logic_done = devc->num_logic_channels > 0 ? 0 : samples_todo;
778 analog_done = devc->num_analog_channels > 0 ? 0 : samples_todo;
780 while (logic_done < samples_todo || analog_done < samples_todo) {
782 if (logic_done < samples_todo) {
783 sending_now = MIN(samples_todo - logic_done,
784 LOGIC_BUFSIZE / devc->logic_unitsize);
785 logic_generator(sdi, sending_now * devc->logic_unitsize);
786 packet.type = SR_DF_LOGIC;
787 packet.payload = &logic;
788 logic.length = sending_now * devc->logic_unitsize;
789 logic.unitsize = devc->logic_unitsize;
790 logic.data = devc->logic_data;
791 sr_session_send(sdi, &packet);
792 logic_done += sending_now;
795 /* Analog, one channel at a time */
796 if (analog_done < samples_todo) {
799 g_hash_table_iter_init(&iter, devc->ch_ag);
800 while (g_hash_table_iter_next(&iter, NULL, &value)) {
801 send_analog_packet(value, sdi, &analog_sent,
802 devc->sent_samples + analog_done,
803 samples_todo - analog_done);
805 analog_done += analog_sent;
808 /* At this point, both logic_done and analog_done should be
809 * exactly equal to samples_todo, or else.
811 if (logic_done != samples_todo || analog_done != samples_todo) {
812 sr_err("BUG: Sample count mismatch.");
813 return G_SOURCE_REMOVE;
815 devc->sent_samples += samples_todo;
816 devc->spent_us += todo_us;
818 if ((devc->limit_samples > 0 && devc->sent_samples >= devc->limit_samples)
819 || (limit_us > 0 && devc->spent_us >= limit_us)) {
821 /* If we're averaging everything - now is the time to send data */
822 if (devc->avg_samples == 0) {
823 g_hash_table_iter_init(&iter, devc->ch_ag);
824 while (g_hash_table_iter_next(&iter, NULL, &value)) {
826 packet.type = SR_DF_ANALOG_OLD;
827 packet.payload = &ag->packet;
828 ag->packet.data = &ag->avg_val;
829 ag->packet.num_samples = 1;
830 sr_session_send(sdi, &packet);
833 sr_dbg("Requested number of samples reached.");
834 dev_acquisition_stop(sdi);
837 return G_SOURCE_CONTINUE;
840 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
842 struct dev_context *devc;
846 if (sdi->status != SR_ST_ACTIVE)
847 return SR_ERR_DEV_CLOSED;
850 devc->sent_samples = 0;
852 g_hash_table_iter_init(&iter, devc->ch_ag);
853 while (g_hash_table_iter_next(&iter, NULL, &value))
854 generate_analog_pattern(value, devc->cur_samplerate);
856 sr_session_source_add(sdi->session, -1, 0, 100,
857 prepare_data, (struct sr_dev_inst *)sdi);
859 std_session_send_df_header(sdi, LOG_PREFIX);
861 /* We use this timestamp to decide how many more samples to send. */
862 devc->start_us = g_get_monotonic_time();
868 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
870 sr_dbg("Stopping acquisition.");
871 sr_session_source_remove(sdi->session, -1);
872 std_session_send_df_end(sdi, LOG_PREFIX);
877 static struct sr_dev_driver demo_driver_info = {
879 .longname = "Demo driver and pattern generator",
882 .cleanup = std_cleanup,
884 .dev_list = std_dev_list,
885 .dev_clear = dev_clear,
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,
895 SR_REGISTER_DEV_DRIVER(demo_driver_info);