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");
289 devc = g_malloc0(sizeof(struct dev_context));
290 devc->cur_samplerate = SR_KHZ(200);
291 devc->num_logic_channels = num_logic_channels;
292 devc->logic_unitsize = (devc->num_logic_channels + 7) / 8;
293 devc->logic_pattern = PATTERN_SIGROK;
294 devc->num_analog_channels = num_analog_channels;
296 if (num_logic_channels > 0) {
297 /* Logic channels, all in one channel group. */
298 cg = g_malloc0(sizeof(struct sr_channel_group));
299 cg->name = g_strdup("Logic");
300 for (i = 0; i < num_logic_channels; i++) {
301 sprintf(channel_name, "D%d", i);
302 ch = sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE, channel_name);
303 cg->channels = g_slist_append(cg->channels, ch);
305 sdi->channel_groups = g_slist_append(NULL, cg);
308 /* Analog channels, channel groups and pattern generators. */
309 if (num_analog_channels > 0) {
311 /* An "Analog" channel group with all analog channels in it. */
312 acg = g_malloc0(sizeof(struct sr_channel_group));
313 acg->name = g_strdup("Analog");
314 sdi->channel_groups = g_slist_append(sdi->channel_groups, acg);
316 devc->ch_ag = g_hash_table_new(g_direct_hash, g_direct_equal);
317 for (i = 0; i < num_analog_channels; i++) {
318 snprintf(channel_name, 16, "A%d", i);
319 ch = sr_channel_new(sdi, i + num_logic_channels, SR_CHANNEL_ANALOG,
321 acg->channels = g_slist_append(acg->channels, ch);
323 /* Every analog channel gets its own channel group as well. */
324 cg = g_malloc0(sizeof(struct sr_channel_group));
325 cg->name = g_strdup(channel_name);
326 cg->channels = g_slist_append(NULL, ch);
327 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
329 /* Every channel gets a generator struct. */
330 ag = g_malloc(sizeof(struct analog_gen));
331 ag->amplitude = DEFAULT_ANALOG_AMPLITUDE;
332 ag->packet.channels = cg->channels;
334 ag->packet.mqflags = 0;
335 ag->packet.unit = SR_UNIT_VOLT;
336 ag->packet.data = ag->pattern_data;
337 ag->pattern = pattern;
340 g_hash_table_insert(devc->ch_ag, ch, ag);
342 if (++pattern == ARRAY_SIZE(analog_pattern_str))
348 devices = g_slist_append(devices, sdi);
349 drvc->instances = g_slist_append(drvc->instances, sdi);
354 static int dev_open(struct sr_dev_inst *sdi)
356 sdi->status = SR_ST_ACTIVE;
361 static int dev_close(struct sr_dev_inst *sdi)
363 sdi->status = SR_ST_INACTIVE;
368 static void clear_helper(void *priv)
370 struct dev_context *devc;
376 /* Analog generators. */
377 g_hash_table_iter_init(&iter, devc->ch_ag);
378 while (g_hash_table_iter_next(&iter, NULL, &value))
380 g_hash_table_unref(devc->ch_ag);
384 static int dev_clear(const struct sr_dev_driver *di)
386 return std_dev_clear(di, clear_helper);
389 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
390 const struct sr_channel_group *cg)
392 struct dev_context *devc;
393 struct sr_channel *ch;
394 struct analog_gen *ag;
402 case SR_CONF_SAMPLERATE:
403 *data = g_variant_new_uint64(devc->cur_samplerate);
405 case SR_CONF_LIMIT_SAMPLES:
406 *data = g_variant_new_uint64(devc->limit_samples);
408 case SR_CONF_LIMIT_MSEC:
409 *data = g_variant_new_uint64(devc->limit_msec);
411 case SR_CONF_AVERAGING:
412 *data = g_variant_new_boolean(devc->avg);
414 case SR_CONF_AVG_SAMPLES:
415 *data = g_variant_new_uint64(devc->avg_samples);
417 case SR_CONF_PATTERN_MODE:
419 return SR_ERR_CHANNEL_GROUP;
420 /* Any channel in the group will do. */
421 ch = cg->channels->data;
422 if (ch->type == SR_CHANNEL_LOGIC) {
423 pattern = devc->logic_pattern;
424 *data = g_variant_new_string(logic_pattern_str[pattern]);
425 } else if (ch->type == SR_CHANNEL_ANALOG) {
426 ag = g_hash_table_lookup(devc->ch_ag, ch);
427 pattern = ag->pattern;
428 *data = g_variant_new_string(analog_pattern_str[pattern]);
432 case SR_CONF_AMPLITUDE:
434 return SR_ERR_CHANNEL_GROUP;
435 /* Any channel in the group will do. */
436 ch = cg->channels->data;
437 if (ch->type != SR_CHANNEL_ANALOG)
439 ag = g_hash_table_lookup(devc->ch_ag, ch);
440 *data = g_variant_new_double(ag->amplitude);
449 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
450 const struct sr_channel_group *cg)
452 struct dev_context *devc;
453 struct analog_gen *ag;
454 struct sr_channel *ch;
456 int logic_pattern, analog_pattern, ret;
462 if (sdi->status != SR_ST_ACTIVE)
463 return SR_ERR_DEV_CLOSED;
467 case SR_CONF_SAMPLERATE:
468 devc->cur_samplerate = g_variant_get_uint64(data);
470 case SR_CONF_LIMIT_SAMPLES:
471 devc->limit_msec = 0;
472 devc->limit_samples = g_variant_get_uint64(data);
474 case SR_CONF_LIMIT_MSEC:
475 devc->limit_msec = g_variant_get_uint64(data);
476 devc->limit_samples = 0;
478 case SR_CONF_AVERAGING:
479 devc->avg = g_variant_get_boolean(data);
480 sr_dbg("%s averaging", devc->avg ? "Enabling" : "Disabling");
482 case SR_CONF_AVG_SAMPLES:
483 devc->avg_samples = g_variant_get_uint64(data);
484 sr_dbg("Setting averaging rate to %" PRIu64, devc->avg_samples);
486 case SR_CONF_PATTERN_MODE:
488 return SR_ERR_CHANNEL_GROUP;
489 stropt = g_variant_get_string(data, NULL);
490 logic_pattern = analog_pattern = -1;
491 for (i = 0; i < ARRAY_SIZE(logic_pattern_str); i++) {
492 if (!strcmp(stropt, logic_pattern_str[i])) {
497 for (i = 0; i < ARRAY_SIZE(analog_pattern_str); i++) {
498 if (!strcmp(stropt, analog_pattern_str[i])) {
503 if (logic_pattern == -1 && analog_pattern == -1)
505 for (l = cg->channels; l; l = l->next) {
507 if (ch->type == SR_CHANNEL_LOGIC) {
508 if (logic_pattern == -1)
510 sr_dbg("Setting logic pattern to %s",
511 logic_pattern_str[logic_pattern]);
512 devc->logic_pattern = logic_pattern;
513 /* Might as well do this now, these are static. */
514 if (logic_pattern == PATTERN_ALL_LOW)
515 memset(devc->logic_data, 0x00, LOGIC_BUFSIZE);
516 else if (logic_pattern == PATTERN_ALL_HIGH)
517 memset(devc->logic_data, 0xff, LOGIC_BUFSIZE);
518 } else if (ch->type == SR_CHANNEL_ANALOG) {
519 if (analog_pattern == -1)
521 sr_dbg("Setting analog pattern for channel %s to %s",
522 ch->name, analog_pattern_str[analog_pattern]);
523 ag = g_hash_table_lookup(devc->ch_ag, ch);
524 ag->pattern = analog_pattern;
529 case SR_CONF_AMPLITUDE:
531 return SR_ERR_CHANNEL_GROUP;
532 for (l = cg->channels; l; l = l->next) {
534 if (ch->type != SR_CHANNEL_ANALOG)
536 ag = g_hash_table_lookup(devc->ch_ag, ch);
537 ag->amplitude = g_variant_get_double(data);
547 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
548 const struct sr_channel_group *cg)
550 struct sr_channel *ch;
554 if (key == SR_CONF_SCAN_OPTIONS) {
555 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
556 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
560 if (key == SR_CONF_DEVICE_OPTIONS && !sdi) {
561 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
562 drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
571 case SR_CONF_DEVICE_OPTIONS:
572 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
573 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
575 case SR_CONF_SAMPLERATE:
576 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
577 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates,
578 ARRAY_SIZE(samplerates), sizeof(uint64_t));
579 g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
580 *data = g_variant_builder_end(&gvb);
586 ch = cg->channels->data;
588 case SR_CONF_DEVICE_OPTIONS:
589 if (ch->type == SR_CHANNEL_LOGIC)
590 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
591 devopts_cg_logic, ARRAY_SIZE(devopts_cg_logic),
593 else if (ch->type == SR_CHANNEL_ANALOG) {
594 if (strcmp(cg->name, "Analog") == 0)
595 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
596 devopts_cg_analog_group, ARRAY_SIZE(devopts_cg_analog_group),
599 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
600 devopts_cg_analog_channel, ARRAY_SIZE(devopts_cg_analog_channel),
606 case SR_CONF_PATTERN_MODE:
607 /* The analog group (with all 4 channels) shall not have a pattern property. */
608 if (strcmp(cg->name, "Analog") == 0)
611 if (ch->type == SR_CHANNEL_LOGIC)
612 *data = g_variant_new_strv(logic_pattern_str,
613 ARRAY_SIZE(logic_pattern_str));
614 else if (ch->type == SR_CHANNEL_ANALOG)
615 *data = g_variant_new_strv(analog_pattern_str,
616 ARRAY_SIZE(analog_pattern_str));
628 static void logic_generator(struct sr_dev_inst *sdi, uint64_t size)
630 struct dev_context *devc;
636 switch (devc->logic_pattern) {
638 memset(devc->logic_data, 0x00, size);
639 for (i = 0; i < size; i += devc->logic_unitsize) {
640 for (j = 0; j < devc->logic_unitsize; j++) {
641 pat = pattern_sigrok[(devc->step + j) % sizeof(pattern_sigrok)] >> 1;
642 devc->logic_data[i + j] = ~pat;
648 for (i = 0; i < size; i++)
649 devc->logic_data[i] = (uint8_t)(rand() & 0xff);
652 for (i = 0; i < size; i++) {
653 for (j = 0; j < devc->logic_unitsize; j++) {
654 devc->logic_data[i + j] = devc->step;
659 case PATTERN_ALL_LOW:
660 case PATTERN_ALL_HIGH:
661 /* These were set when the pattern mode was selected. */
664 sr_err("Unknown pattern: %d.", devc->logic_pattern);
669 static void send_analog_packet(struct analog_gen *ag,
670 struct sr_dev_inst *sdi,
671 uint64_t *analog_sent,
673 uint64_t analog_todo)
675 struct sr_datafeed_packet packet;
676 struct dev_context *devc;
677 uint64_t sending_now, to_avg;
682 packet.type = SR_DF_ANALOG_OLD;
683 packet.payload = &ag->packet;
686 ag_pattern_pos = analog_pos % ag->num_samples;
687 sending_now = MIN(analog_todo, ag->num_samples-ag_pattern_pos);
688 ag->packet.data = ag->pattern_data + ag_pattern_pos;
689 ag->packet.num_samples = sending_now;
690 sr_session_send(sdi, &packet);
692 /* Whichever channel group gets there first. */
693 *analog_sent = MAX(*analog_sent, sending_now);
695 ag_pattern_pos = analog_pos % ag->num_samples;
696 to_avg = MIN(analog_todo, ag->num_samples-ag_pattern_pos);
698 for (i = 0; i < to_avg; i++) {
699 ag->avg_val = (ag->avg_val +
701 ag_pattern_pos + i)) / 2;
703 /* Time to send averaged data? */
704 if (devc->avg_samples > 0 &&
705 ag->num_avgs >= devc->avg_samples)
709 if (devc->avg_samples == 0) {
710 /* We're averaging all the samples, so wait with
711 * sending until the very end.
713 *analog_sent = ag->num_avgs;
718 ag->packet.data = &ag->avg_val;
719 ag->packet.num_samples = 1;
721 sr_session_send(sdi, &packet);
722 *analog_sent = ag->num_avgs;
729 /* Callback handling data */
730 static int prepare_data(int fd, int revents, void *cb_data)
732 struct sr_dev_inst *sdi;
733 struct dev_context *devc;
734 struct sr_datafeed_packet packet;
735 struct sr_datafeed_logic logic;
736 struct analog_gen *ag;
739 uint64_t samples_todo, logic_done, analog_done, analog_sent, sending_now;
740 int64_t elapsed_us, limit_us, todo_us;
749 if (devc->cur_samplerate <= 0
750 || (devc->num_logic_channels <= 0
751 && devc->num_analog_channels <= 0)) {
752 dev_acquisition_stop(sdi);
753 return G_SOURCE_CONTINUE;
756 /* What time span should we send samples for? */
757 elapsed_us = g_get_monotonic_time() - devc->start_us;
758 limit_us = 1000 * devc->limit_msec;
759 if (limit_us > 0 && limit_us < elapsed_us)
760 todo_us = MAX(0, limit_us - devc->spent_us);
762 todo_us = MAX(0, elapsed_us - devc->spent_us);
764 /* How many samples are outstanding since the last round? */
765 samples_todo = (todo_us * devc->cur_samplerate + G_USEC_PER_SEC - 1)
767 if (devc->limit_samples > 0) {
768 if (devc->limit_samples < devc->sent_samples)
770 else if (devc->limit_samples - devc->sent_samples < samples_todo)
771 samples_todo = devc->limit_samples - devc->sent_samples;
773 /* Calculate the actual time covered by this run back from the sample
774 * count, rounded towards zero. This avoids getting stuck on a too-low
775 * time delta with no samples being sent due to round-off.
777 todo_us = samples_todo * G_USEC_PER_SEC / devc->cur_samplerate;
779 logic_done = devc->num_logic_channels > 0 ? 0 : samples_todo;
780 analog_done = devc->num_analog_channels > 0 ? 0 : samples_todo;
782 while (logic_done < samples_todo || analog_done < samples_todo) {
784 if (logic_done < samples_todo) {
785 sending_now = MIN(samples_todo - logic_done,
786 LOGIC_BUFSIZE / devc->logic_unitsize);
787 logic_generator(sdi, sending_now * devc->logic_unitsize);
788 packet.type = SR_DF_LOGIC;
789 packet.payload = &logic;
790 logic.length = sending_now * devc->logic_unitsize;
791 logic.unitsize = devc->logic_unitsize;
792 logic.data = devc->logic_data;
793 sr_session_send(sdi, &packet);
794 logic_done += sending_now;
797 /* Analog, one channel at a time */
798 if (analog_done < samples_todo) {
801 g_hash_table_iter_init(&iter, devc->ch_ag);
802 while (g_hash_table_iter_next(&iter, NULL, &value)) {
803 send_analog_packet(value, sdi, &analog_sent,
804 devc->sent_samples + analog_done,
805 samples_todo - analog_done);
807 analog_done += analog_sent;
810 /* At this point, both logic_done and analog_done should be
811 * exactly equal to samples_todo, or else.
813 if (logic_done != samples_todo || analog_done != samples_todo) {
814 sr_err("BUG: Sample count mismatch.");
815 return G_SOURCE_REMOVE;
817 devc->sent_samples += samples_todo;
818 devc->spent_us += todo_us;
820 if ((devc->limit_samples > 0 && devc->sent_samples >= devc->limit_samples)
821 || (limit_us > 0 && devc->spent_us >= limit_us)) {
823 /* If we're averaging everything - now is the time to send data */
824 if (devc->avg_samples == 0) {
825 g_hash_table_iter_init(&iter, devc->ch_ag);
826 while (g_hash_table_iter_next(&iter, NULL, &value)) {
828 packet.type = SR_DF_ANALOG_OLD;
829 packet.payload = &ag->packet;
830 ag->packet.data = &ag->avg_val;
831 ag->packet.num_samples = 1;
832 sr_session_send(sdi, &packet);
835 sr_dbg("Requested number of samples reached.");
836 dev_acquisition_stop(sdi);
839 return G_SOURCE_CONTINUE;
842 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
844 struct dev_context *devc;
848 if (sdi->status != SR_ST_ACTIVE)
849 return SR_ERR_DEV_CLOSED;
852 devc->sent_samples = 0;
854 g_hash_table_iter_init(&iter, devc->ch_ag);
855 while (g_hash_table_iter_next(&iter, NULL, &value))
856 generate_analog_pattern(value, devc->cur_samplerate);
858 sr_session_source_add(sdi->session, -1, 0, 100,
859 prepare_data, (struct sr_dev_inst *)sdi);
861 std_session_send_df_header(sdi, LOG_PREFIX);
863 /* We use this timestamp to decide how many more samples to send. */
864 devc->start_us = g_get_monotonic_time();
870 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
872 sr_dbg("Stopping acquisition.");
873 sr_session_source_remove(sdi->session, -1);
874 std_session_send_df_end(sdi, LOG_PREFIX);
879 static struct sr_dev_driver demo_driver_info = {
881 .longname = "Demo driver and pattern generator",
884 .cleanup = std_cleanup,
886 .dev_list = std_dev_list,
887 .dev_clear = dev_clear,
888 .config_get = config_get,
889 .config_set = config_set,
890 .config_list = config_list,
891 .dev_open = dev_open,
892 .dev_close = dev_close,
893 .dev_acquisition_start = dev_acquisition_start,
894 .dev_acquisition_stop = dev_acquisition_stop,
897 SR_REGISTER_DEV_DRIVER(demo_driver_info);