src/hardware/demo/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   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>
   8  * Copyright (C) 2019 Frank Stettner <frank-stettner@gmx.net>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24 #include <config.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <math.h>
  28 #include <libsigrok/libsigrok.h>
  29 #include "libsigrok-internal.h"
  30 #include "protocol.h"
  31
  32 #define DEFAULT_NUM_LOGIC_CHANNELS              8
  33 #define DEFAULT_LOGIC_PATTERN                   PATTERN_SIGROK
  34
  35 #define DEFAULT_NUM_ANALOG_CHANNELS             4
  36
  37 /* Note: No spaces allowed because of sigrok-cli. */
  38 static const char *logic_pattern_str[] = {
  39         "sigrok",
  40         "random",
  41         "incremental",
  42         "walking-one",
  43         "walking-zero",
  44         "all-low",
  45         "all-high",
  46         "squid",
  47         "graycode",
  48 };
  49
  50 static const uint32_t scanopts[] = {
  51         SR_CONF_NUM_LOGIC_CHANNELS,
  52         SR_CONF_NUM_ANALOG_CHANNELS,
  53         SR_CONF_LIMIT_FRAMES,
  54 };
  55
  56 static const uint32_t drvopts[] = {
  57         SR_CONF_DEMO_DEV,
  58         SR_CONF_LOGIC_ANALYZER,
  59         SR_CONF_OSCILLOSCOPE,
  60 };
  61
  62 static const uint32_t devopts[] = {
  63         SR_CONF_CONTINUOUS,
  64         SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
  65         SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET,
  66         SR_CONF_LIMIT_FRAMES | SR_CONF_GET | SR_CONF_SET,
  67         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  68         SR_CONF_AVERAGING | SR_CONF_GET | SR_CONF_SET,
  69         SR_CONF_AVG_SAMPLES | SR_CONF_GET | SR_CONF_SET,
  70         SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
  71         SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
  72 };
  73
  74 static const uint32_t devopts_cg_logic[] = {
  75         SR_CONF_PATTERN_MODE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  76 };
  77
  78 static const uint32_t devopts_cg_analog_group[] = {
  79         SR_CONF_AMPLITUDE | SR_CONF_GET | SR_CONF_SET,
  80 };
  81
  82 static const uint32_t devopts_cg_analog_channel[] = {
  83         SR_CONF_MEASURED_QUANTITY | SR_CONF_GET | SR_CONF_SET,
  84         SR_CONF_PATTERN_MODE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  85         SR_CONF_AMPLITUDE | SR_CONF_GET | SR_CONF_SET,
  86 };
  87
  88 static const int32_t trigger_matches[] = {
  89         SR_TRIGGER_ZERO,
  90         SR_TRIGGER_ONE,
  91         SR_TRIGGER_RISING,
  92         SR_TRIGGER_FALLING,
  93         SR_TRIGGER_EDGE,
  94 };
  95
  96 static const uint64_t samplerates[] = {
  97         SR_HZ(1),
  98         SR_GHZ(1),
  99         SR_HZ(1),
 100 };
 101
 102 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 103 {
 104         struct dev_context *devc;
 105         struct sr_dev_inst *sdi;
 106         struct sr_channel *ch;
 107         struct sr_channel_group *cg, *acg;
 108         struct sr_config *src;
 109         struct analog_gen *ag;
 110         GSList *l;
 111         int num_logic_channels, num_analog_channels, pattern, i;
 112         uint64_t limit_frames;
 113         char channel_name[16];
 114
 115         num_logic_channels = DEFAULT_NUM_LOGIC_CHANNELS;
 116         num_analog_channels = DEFAULT_NUM_ANALOG_CHANNELS;
 117         limit_frames = DEFAULT_LIMIT_FRAMES;
 118         for (l = options; l; l = l->next) {
 119                 src = l->data;
 120                 switch (src->key) {
 121                 case SR_CONF_NUM_LOGIC_CHANNELS:
 122                         num_logic_channels = g_variant_get_int32(src->data);
 123                         break;
 124                 case SR_CONF_NUM_ANALOG_CHANNELS:
 125                         num_analog_channels = g_variant_get_int32(src->data);
 126                         break;
 127                 case SR_CONF_LIMIT_FRAMES:
 128                         limit_frames = g_variant_get_uint64(src->data);
 129                         break;
 130                 }
 131         }
 132
 133         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 134         sdi->status = SR_ST_INACTIVE;
 135         sdi->model = g_strdup("Demo device");
 136
 137         devc = g_malloc0(sizeof(struct dev_context));
 138         devc->cur_samplerate = SR_KHZ(200);
 139         devc->num_logic_channels = num_logic_channels;
 140         devc->logic_unitsize = (devc->num_logic_channels + 7) / 8;
 141         devc->all_logic_channels_mask = 1UL << 0;
 142         devc->all_logic_channels_mask <<= devc->num_logic_channels;
 143         devc->all_logic_channels_mask--;
 144         devc->logic_pattern = DEFAULT_LOGIC_PATTERN;
 145         devc->num_analog_channels = num_analog_channels;
 146         devc->limit_frames = limit_frames;
 147         devc->capture_ratio = 20;
 148         devc->stl = NULL;
 149
 150         if (num_logic_channels > 0) {
 151                 /* Logic channels, all in one channel group. */
 152                 cg = g_malloc0(sizeof(struct sr_channel_group));
 153                 cg->name = g_strdup("Logic");
 154                 for (i = 0; i < num_logic_channels; i++) {
 155                         sprintf(channel_name, "D%d", i);
 156                         ch = sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE, channel_name);
 157                         cg->channels = g_slist_append(cg->channels, ch);
 158                 }
 159                 sdi->channel_groups = g_slist_append(NULL, cg);
 160         }
 161
 162         /* Analog channels, channel groups and pattern generators. */
 163         devc->ch_ag = g_hash_table_new(g_direct_hash, g_direct_equal);
 164         if (num_analog_channels > 0) {
 165                 /*
 166                  * Have the waveform for analog patterns pre-generated. It's
 167                  * supposed to be periodic, so the generator just needs to
 168                  * access the prepared sample data (DDS style).
 169                  */
 170                 demo_generate_analog_pattern(devc);
 171
 172                 pattern = 0;
 173                 /* An "Analog" channel group with all analog channels in it. */
 174                 acg = g_malloc0(sizeof(struct sr_channel_group));
 175                 acg->name = g_strdup("Analog");
 176                 sdi->channel_groups = g_slist_append(sdi->channel_groups, acg);
 177
 178                 for (i = 0; i < num_analog_channels; i++) {
 179                         snprintf(channel_name, 16, "A%d", i);
 180                         ch = sr_channel_new(sdi, i + num_logic_channels, SR_CHANNEL_ANALOG,
 181                                         TRUE, channel_name);
 182                         acg->channels = g_slist_append(acg->channels, ch);
 183
 184                         /* Every analog channel gets its own channel group as well. */
 185                         cg = g_malloc0(sizeof(struct sr_channel_group));
 186                         cg->name = g_strdup(channel_name);
 187                         cg->channels = g_slist_append(NULL, ch);
 188                         sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 189
 190                         /* Every channel gets a generator struct. */
 191                         ag = g_malloc(sizeof(struct analog_gen));
 192                         ag->ch = ch;
 193                         ag->mq = SR_MQ_VOLTAGE;
 194                         ag->mq_flags = SR_MQFLAG_DC;
 195                         ag->unit = SR_UNIT_VOLT;
 196                         ag->amplitude = DEFAULT_ANALOG_AMPLITUDE;
 197                         ag->offset = DEFAULT_ANALOG_OFFSET;
 198                         sr_analog_init(&ag->packet, &ag->encoding, &ag->meaning, &ag->spec, 2);
 199                         ag->packet.meaning->channels = cg->channels;
 200                         ag->packet.meaning->mq = ag->mq;
 201                         ag->packet.meaning->mqflags = ag->mq_flags;
 202                         ag->packet.meaning->unit = ag->unit;
 203                         ag->packet.encoding->digits = DEFAULT_ANALOG_ENCODING_DIGITS;
 204                         ag->packet.spec->spec_digits = DEFAULT_ANALOG_SPEC_DIGITS;
 205                         ag->packet.data = devc->analog_patterns[pattern];
 206                         ag->pattern = pattern;
 207                         ag->avg_val = 0.0f;
 208                         ag->num_avgs = 0;
 209                         g_hash_table_insert(devc->ch_ag, ch, ag);
 210
 211                         if (++pattern == ARRAY_SIZE(analog_pattern_str))
 212                                 pattern = 0;
 213                 }
 214         }
 215
 216         sdi->priv = devc;
 217
 218         return std_scan_complete(di, g_slist_append(NULL, sdi));
 219 }
 220
 221 static void clear_helper(struct dev_context *devc)
 222 {
 223         GHashTableIter iter;
 224         void *value;
 225
 226         /* Analog generators. */
 227         g_hash_table_iter_init(&iter, devc->ch_ag);
 228         while (g_hash_table_iter_next(&iter, NULL, &value))
 229                 g_free(value);
 230         g_hash_table_unref(devc->ch_ag);
 231 }
 232
 233 static int dev_clear(const struct sr_dev_driver *di)
 234 {
 235         return std_dev_clear_with_callback(di, (std_dev_clear_callback)clear_helper);
 236 }
 237
 238 static int config_get(uint32_t key, GVariant **data,
 239         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 240 {
 241         struct dev_context *devc;
 242         struct sr_channel *ch;
 243         struct analog_gen *ag;
 244         GVariant *mq_arr[2];
 245         int pattern;
 246
 247         if (!sdi)
 248                 return SR_ERR_ARG;
 249
 250         devc = sdi->priv;
 251         switch (key) {
 252         case SR_CONF_SAMPLERATE:
 253                 *data = g_variant_new_uint64(devc->cur_samplerate);
 254                 break;
 255         case SR_CONF_LIMIT_SAMPLES:
 256                 *data = g_variant_new_uint64(devc->limit_samples);
 257                 break;
 258         case SR_CONF_LIMIT_MSEC:
 259                 *data = g_variant_new_uint64(devc->limit_msec);
 260                 break;
 261         case SR_CONF_LIMIT_FRAMES:
 262                 *data = g_variant_new_uint64(devc->limit_frames);
 263                 break;
 264         case SR_CONF_AVERAGING:
 265                 *data = g_variant_new_boolean(devc->avg);
 266                 break;
 267         case SR_CONF_AVG_SAMPLES:
 268                 *data = g_variant_new_uint64(devc->avg_samples);
 269                 break;
 270         case SR_CONF_MEASURED_QUANTITY:
 271                 if (!cg)
 272                         return SR_ERR_CHANNEL_GROUP;
 273                 /* Any channel in the group will do. */
 274                 ch = cg->channels->data;
 275                 if (ch->type != SR_CHANNEL_ANALOG)
 276                         return SR_ERR_ARG;
 277                 ag = g_hash_table_lookup(devc->ch_ag, ch);
 278                 mq_arr[0] = g_variant_new_uint32(ag->mq);
 279                 mq_arr[1] = g_variant_new_uint64(ag->mq_flags);
 280                 *data = g_variant_new_tuple(mq_arr, 2);
 281                 break;
 282         case SR_CONF_PATTERN_MODE:
 283                 if (!cg)
 284                         return SR_ERR_CHANNEL_GROUP;
 285                 /* Any channel in the group will do. */
 286                 ch = cg->channels->data;
 287                 if (ch->type == SR_CHANNEL_LOGIC) {
 288                         pattern = devc->logic_pattern;
 289                         *data = g_variant_new_string(logic_pattern_str[pattern]);
 290                 } else if (ch->type == SR_CHANNEL_ANALOG) {
 291                         ag = g_hash_table_lookup(devc->ch_ag, ch);
 292                         pattern = ag->pattern;
 293                         *data = g_variant_new_string(analog_pattern_str[pattern]);
 294                 } else
 295                         return SR_ERR_BUG;
 296                 break;
 297         case SR_CONF_AMPLITUDE:
 298                 if (!cg)
 299                         return SR_ERR_CHANNEL_GROUP;
 300                 /* Any channel in the group will do. */
 301                 ch = cg->channels->data;
 302                 if (ch->type != SR_CHANNEL_ANALOG)
 303                         return SR_ERR_ARG;
 304                 ag = g_hash_table_lookup(devc->ch_ag, ch);
 305                 *data = g_variant_new_double(ag->amplitude);
 306                 break;
 307         case SR_CONF_CAPTURE_RATIO:
 308                 *data = g_variant_new_uint64(devc->capture_ratio);
 309                 break;
 310         default:
 311                 return SR_ERR_NA;
 312         }
 313
 314         return SR_OK;
 315 }
 316
 317 static int config_set(uint32_t key, GVariant *data,
 318         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 319 {
 320         struct dev_context *devc;
 321         struct analog_gen *ag;
 322         struct sr_channel *ch;
 323         GVariant *mq_tuple_child;
 324         GSList *l;
 325         int logic_pattern, analog_pattern;
 326
 327         devc = sdi->priv;
 328
 329         switch (key) {
 330         case SR_CONF_SAMPLERATE:
 331                 devc->cur_samplerate = g_variant_get_uint64(data);
 332                 break;
 333         case SR_CONF_LIMIT_SAMPLES:
 334                 devc->limit_msec = 0;
 335                 devc->limit_samples = g_variant_get_uint64(data);
 336                 break;
 337         case SR_CONF_LIMIT_MSEC:
 338                 devc->limit_msec = g_variant_get_uint64(data);
 339                 devc->limit_samples = 0;
 340                 break;
 341         case SR_CONF_LIMIT_FRAMES:
 342                 devc->limit_frames = g_variant_get_uint64(data);
 343                 break;
 344         case SR_CONF_AVERAGING:
 345                 devc->avg = g_variant_get_boolean(data);
 346                 sr_dbg("%s averaging", devc->avg ? "Enabling" : "Disabling");
 347                 break;
 348         case SR_CONF_AVG_SAMPLES:
 349                 devc->avg_samples = g_variant_get_uint64(data);
 350                 sr_dbg("Setting averaging rate to %" PRIu64, devc->avg_samples);
 351                 break;
 352         case SR_CONF_MEASURED_QUANTITY:
 353                 if (!cg)
 354                         return SR_ERR_CHANNEL_GROUP;
 355                 for (l = cg->channels; l; l = l->next) {
 356                         ch = l->data;
 357                         if (ch->type != SR_CHANNEL_ANALOG)
 358                                 return SR_ERR_ARG;
 359                         ag = g_hash_table_lookup(devc->ch_ag, ch);
 360                         mq_tuple_child = g_variant_get_child_value(data, 0);
 361                         ag->mq = g_variant_get_uint32(mq_tuple_child);
 362                         mq_tuple_child = g_variant_get_child_value(data, 1);
 363                         ag->mq_flags = g_variant_get_uint64(mq_tuple_child);
 364                         g_variant_unref(mq_tuple_child);
 365                 }
 366                 break;
 367         case SR_CONF_PATTERN_MODE:
 368                 if (!cg)
 369                         return SR_ERR_CHANNEL_GROUP;
 370                 logic_pattern = std_str_idx(data, ARRAY_AND_SIZE(logic_pattern_str));
 371                 analog_pattern = std_str_idx(data, ARRAY_AND_SIZE(analog_pattern_str));
 372                 if (logic_pattern < 0 && analog_pattern < 0)
 373                         return SR_ERR_ARG;
 374                 for (l = cg->channels; l; l = l->next) {
 375                         ch = l->data;
 376                         if (ch->type == SR_CHANNEL_LOGIC) {
 377                                 if (logic_pattern == -1)
 378                                         return SR_ERR_ARG;
 379                                 sr_dbg("Setting logic pattern to %s",
 380                                                 logic_pattern_str[logic_pattern]);
 381                                 devc->logic_pattern = logic_pattern;
 382                                 /* Might as well do this now, these are static. */
 383                                 if (logic_pattern == PATTERN_ALL_LOW)
 384                                         memset(devc->logic_data, 0x00, LOGIC_BUFSIZE);
 385                                 else if (logic_pattern == PATTERN_ALL_HIGH)
 386                                         memset(devc->logic_data, 0xff, LOGIC_BUFSIZE);
 387                         } else if (ch->type == SR_CHANNEL_ANALOG) {
 388                                 if (analog_pattern == -1)
 389                                         return SR_ERR_ARG;
 390                                 sr_dbg("Setting analog pattern for channel %s to %s",
 391                                                 ch->name, analog_pattern_str[analog_pattern]);
 392                                 ag = g_hash_table_lookup(devc->ch_ag, ch);
 393                                 ag->pattern = analog_pattern;
 394                         } else
 395                                 return SR_ERR_BUG;
 396                 }
 397                 break;
 398         case SR_CONF_AMPLITUDE:
 399                 if (!cg)
 400                         return SR_ERR_CHANNEL_GROUP;
 401                 for (l = cg->channels; l; l = l->next) {
 402                         ch = l->data;
 403                         if (ch->type != SR_CHANNEL_ANALOG)
 404                                 return SR_ERR_ARG;
 405                         ag = g_hash_table_lookup(devc->ch_ag, ch);
 406                         ag->amplitude = g_variant_get_double(data);
 407                 }
 408                 break;
 409         case SR_CONF_CAPTURE_RATIO:
 410                 devc->capture_ratio = g_variant_get_uint64(data);
 411                 break;
 412         default:
 413                 return SR_ERR_NA;
 414         }
 415
 416         return SR_OK;
 417 }
 418
 419 static int config_list(uint32_t key, GVariant **data,
 420         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 421 {
 422         struct sr_channel *ch;
 423
 424         if (!cg) {
 425                 switch (key) {
 426                 case SR_CONF_SCAN_OPTIONS:
 427                 case SR_CONF_DEVICE_OPTIONS:
 428                         return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
 429                 case SR_CONF_SAMPLERATE:
 430                         *data = std_gvar_samplerates_steps(ARRAY_AND_SIZE(samplerates));
 431                         break;
 432                 case SR_CONF_TRIGGER_MATCH:
 433                         *data = std_gvar_array_i32(ARRAY_AND_SIZE(trigger_matches));
 434                         break;
 435                 default:
 436                         return SR_ERR_NA;
 437                 }
 438         } else {
 439                 ch = cg->channels->data;
 440                 switch (key) {
 441                 case SR_CONF_DEVICE_OPTIONS:
 442                         if (ch->type == SR_CHANNEL_LOGIC)
 443                                 *data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg_logic));
 444                         else if (ch->type == SR_CHANNEL_ANALOG) {
 445                                 if (strcmp(cg->name, "Analog") == 0)
 446                                         *data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg_analog_group));
 447                                 else
 448                                         *data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg_analog_channel));
 449                         }
 450                         else
 451                                 return SR_ERR_BUG;
 452                         break;
 453                 case SR_CONF_PATTERN_MODE:
 454                         /* The analog group (with all 4 channels) shall not have a pattern property. */
 455                         if (strcmp(cg->name, "Analog") == 0)
 456                                 return SR_ERR_NA;
 457
 458                         if (ch->type == SR_CHANNEL_LOGIC)
 459                                 *data = g_variant_new_strv(ARRAY_AND_SIZE(logic_pattern_str));
 460                         else if (ch->type == SR_CHANNEL_ANALOG)
 461                                 *data = g_variant_new_strv(ARRAY_AND_SIZE(analog_pattern_str));
 462                         else
 463                                 return SR_ERR_BUG;
 464                         break;
 465                 default:
 466                         return SR_ERR_NA;
 467                 }
 468         }
 469
 470         return SR_OK;
 471 }
 472
 473 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 474 {
 475         struct dev_context *devc;
 476         GSList *l;
 477         struct sr_channel *ch;
 478         int bitpos;
 479         uint8_t mask;
 480         struct sr_trigger *trigger;
 481
 482         devc = sdi->priv;
 483         devc->sent_samples = 0;
 484         devc->sent_frame_samples = 0;
 485
 486         /* Setup triggers */
 487         if ((trigger = sr_session_trigger_get(sdi->session))) {
 488                 int pre_trigger_samples = 0;
 489                 if (devc->limit_samples > 0)
 490                         pre_trigger_samples = (devc->capture_ratio * devc->limit_samples) / 100;
 491                 devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
 492                 if (!devc->stl)
 493                         return SR_ERR_MALLOC;
 494
 495                 /* Disable all analog channels since using them when there are logic
 496                  * triggers set up would require having pre-trigger sample buffers
 497                  * for analog sample data.
 498                  */
 499                 for (l = sdi->channels; l; l = l->next) {
 500                         ch = l->data;
 501                         if (ch->type == SR_CHANNEL_ANALOG)
 502                                 ch->enabled = FALSE;
 503                 }
 504         }
 505         devc->trigger_fired = FALSE;
 506
 507         /*
 508          * Determine the numbers of logic and analog channels that are
 509          * involved in the acquisition. Determine an offset and a mask to
 510          * remove excess logic data content before datafeed submission.
 511          */
 512         devc->enabled_logic_channels = 0;
 513         devc->enabled_analog_channels = 0;
 514         for (l = sdi->channels; l; l = l->next) {
 515                 ch = l->data;
 516                 if (!ch->enabled)
 517                         continue;
 518                 if (ch->type == SR_CHANNEL_ANALOG) {
 519                         devc->enabled_analog_channels++;
 520                         continue;
 521                 }
 522                 if (ch->type != SR_CHANNEL_LOGIC)
 523                         continue;
 524                 /*
 525                  * TODO: Need we create a channel map here, such that the
 526                  * session datafeed packets will have a dense representation
 527                  * of the enabled channels' data? For example store channels
 528                  * D3 and D5 in bit positions 0 and 1 respectively, when all
 529                  * other channels are disabled? The current implementation
 530                  * generates a sparse layout, might provide data for logic
 531                  * channels that are disabled while it might suppress data
 532                  * from enabled channels at the same time.
 533                  */
 534                 devc->enabled_logic_channels++;
 535         }
 536         devc->first_partial_logic_index = devc->enabled_logic_channels / 8;
 537         bitpos = devc->enabled_logic_channels % 8;
 538         mask = (1 << bitpos) - 1;
 539         devc->first_partial_logic_mask = mask;
 540         sr_dbg("num logic %zu, partial off %zu, mask 0x%02x.",
 541                 devc->enabled_logic_channels,
 542                 devc->first_partial_logic_index,
 543                 devc->first_partial_logic_mask);
 544
 545         sr_session_source_add(sdi->session, -1, 0, 100,
 546                         demo_prepare_data, (struct sr_dev_inst *)sdi);
 547
 548         std_session_send_df_header(sdi);
 549
 550         if (devc->limit_frames > 0)
 551                 std_session_send_frame_begin(sdi);
 552
 553         /* We use this timestamp to decide how many more samples to send. */
 554         devc->start_us = g_get_monotonic_time();
 555         devc->spent_us = 0;
 556         devc->step = 0;
 557
 558         return SR_OK;
 559 }
 560
 561 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 562 {
 563         struct dev_context *devc;
 564
 565         sr_session_source_remove(sdi->session, -1);
 566
 567         devc = sdi->priv;
 568         if (devc->limit_frames > 0)
 569                 std_session_send_frame_end(sdi);
 570
 571         std_session_send_df_end(sdi);
 572
 573         if (devc->stl) {
 574                 soft_trigger_logic_free(devc->stl);
 575                 devc->stl = NULL;
 576         }
 577
 578         return SR_OK;
 579 }
 580
 581 static struct sr_dev_driver demo_driver_info = {
 582         .name = "demo",
 583         .longname = "Demo driver and pattern generator",
 584         .api_version = 1,
 585         .init = std_init,
 586         .cleanup = std_cleanup,
 587         .scan = scan,
 588         .dev_list = std_dev_list,
 589         .dev_clear = dev_clear,
 590         .config_get = config_get,
 591         .config_set = config_set,
 592         .config_list = config_list,
 593         .dev_open = std_dummy_dev_open,
 594         .dev_close = std_dummy_dev_close,
 595         .dev_acquisition_start = dev_acquisition_start,
 596         .dev_acquisition_stop = dev_acquisition_stop,
 597         .context = NULL,
 598 };
 599 SR_REGISTER_DEV_DRIVER(demo_driver_info);