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 #define DEFAULT_ANALOG_ENCODING_DIGITS  4
  37 #define DEFAULT_ANALOG_SPEC_DIGITS              4
  38 #define DEFAULT_ANALOG_AMPLITUDE                10
  39
  40 /* Note: No spaces allowed because of sigrok-cli. */
  41 static const char *logic_pattern_str[] = {
  42         "sigrok",
  43         "random",
  44         "incremental",
  45         "walking-one",
  46         "walking-zero",
  47         "all-low",
  48         "all-high",
  49         "squid",
  50         "graycode",
  51 };
  52
  53 static const uint32_t scanopts[] = {
  54         SR_CONF_NUM_LOGIC_CHANNELS,
  55         SR_CONF_NUM_ANALOG_CHANNELS,
  56         SR_CONF_LIMIT_FRAMES,
  57 };
  58
  59 static const uint32_t drvopts[] = {
  60         SR_CONF_DEMO_DEV,
  61         SR_CONF_LOGIC_ANALYZER,
  62         SR_CONF_OSCILLOSCOPE,
  63 };
  64
  65 static const uint32_t devopts[] = {
  66         SR_CONF_CONTINUOUS,
  67         SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
  68         SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET,
  69         SR_CONF_LIMIT_FRAMES | SR_CONF_GET | SR_CONF_SET,
  70         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  71         SR_CONF_AVERAGING | SR_CONF_GET | SR_CONF_SET,
  72         SR_CONF_AVG_SAMPLES | SR_CONF_GET | SR_CONF_SET,
  73         SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
  74         SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
  75 };
  76
  77 static const uint32_t devopts_cg_logic[] = {
  78         SR_CONF_PATTERN_MODE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  79 };
  80
  81 static const uint32_t devopts_cg_analog_group[] = {
  82         SR_CONF_AMPLITUDE | SR_CONF_GET | SR_CONF_SET,
  83 };
  84
  85 static const uint32_t devopts_cg_analog_channel[] = {
  86         SR_CONF_MEASURED_QUANTITY | SR_CONF_GET | SR_CONF_SET,
  87         SR_CONF_PATTERN_MODE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  88         SR_CONF_AMPLITUDE | SR_CONF_GET | SR_CONF_SET,
  89 };
  90
  91 static const int32_t trigger_matches[] = {
  92         SR_TRIGGER_ZERO,
  93         SR_TRIGGER_ONE,
  94         SR_TRIGGER_RISING,
  95         SR_TRIGGER_FALLING,
  96         SR_TRIGGER_EDGE,
  97 };
  98
  99 static const uint64_t samplerates[] = {
 100         SR_HZ(1),
 101         SR_GHZ(1),
 102         SR_HZ(1),
 103 };
 104
 105 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 106 {
 107         struct dev_context *devc;
 108         struct sr_dev_inst *sdi;
 109         struct sr_channel *ch;
 110         struct sr_channel_group *cg, *acg;
 111         struct sr_config *src;
 112         struct analog_gen *ag;
 113         GSList *l;
 114         int num_logic_channels, num_analog_channels, pattern, i;
 115         uint64_t limit_frames;
 116         char channel_name[16];
 117
 118         num_logic_channels = DEFAULT_NUM_LOGIC_CHANNELS;
 119         num_analog_channels = DEFAULT_NUM_ANALOG_CHANNELS;
 120         limit_frames = DEFAULT_LIMIT_FRAMES;
 121         for (l = options; l; l = l->next) {
 122                 src = l->data;
 123                 switch (src->key) {
 124                 case SR_CONF_NUM_LOGIC_CHANNELS:
 125                         num_logic_channels = g_variant_get_int32(src->data);
 126                         break;
 127                 case SR_CONF_NUM_ANALOG_CHANNELS:
 128                         num_analog_channels = g_variant_get_int32(src->data);
 129                         break;
 130                 case SR_CONF_LIMIT_FRAMES:
 131                         limit_frames = g_variant_get_uint64(src->data);
 132                         break;
 133                 }
 134         }
 135
 136         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 137         sdi->status = SR_ST_INACTIVE;
 138         sdi->model = g_strdup("Demo device");
 139
 140         devc = g_malloc0(sizeof(struct dev_context));
 141         devc->cur_samplerate = SR_KHZ(200);
 142         devc->num_logic_channels = num_logic_channels;
 143         devc->logic_unitsize = (devc->num_logic_channels + 7) / 8;
 144         devc->all_logic_channels_mask = 1UL << 0;
 145         devc->all_logic_channels_mask <<= devc->num_logic_channels;
 146         devc->all_logic_channels_mask--;
 147         devc->logic_pattern = DEFAULT_LOGIC_PATTERN;
 148         devc->num_analog_channels = num_analog_channels;
 149         devc->limit_frames = limit_frames;
 150         devc->capture_ratio = 20;
 151         devc->stl = NULL;
 152
 153         if (num_logic_channels > 0) {
 154                 /* Logic channels, all in one channel group. */
 155                 cg = g_malloc0(sizeof(struct sr_channel_group));
 156                 cg->name = g_strdup("Logic");
 157                 for (i = 0; i < num_logic_channels; i++) {
 158                         sprintf(channel_name, "D%d", i);
 159                         ch = sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE, channel_name);
 160                         cg->channels = g_slist_append(cg->channels, ch);
 161                 }
 162                 sdi->channel_groups = g_slist_append(NULL, cg);
 163         }
 164
 165         /* Analog channels, channel groups and pattern generators. */
 166         devc->ch_ag = g_hash_table_new(g_direct_hash, g_direct_equal);
 167         if (num_analog_channels > 0) {
 168                 pattern = 0;
 169                 /* An "Analog" channel group with all analog channels in it. */
 170                 acg = g_malloc0(sizeof(struct sr_channel_group));
 171                 acg->name = g_strdup("Analog");
 172                 sdi->channel_groups = g_slist_append(sdi->channel_groups, acg);
 173
 174                 for (i = 0; i < num_analog_channels; i++) {
 175                         snprintf(channel_name, 16, "A%d", i);
 176                         ch = sr_channel_new(sdi, i + num_logic_channels, SR_CHANNEL_ANALOG,
 177                                         TRUE, channel_name);
 178                         acg->channels = g_slist_append(acg->channels, ch);
 179
 180                         /* Every analog channel gets its own channel group as well. */
 181                         cg = g_malloc0(sizeof(struct sr_channel_group));
 182                         cg->name = g_strdup(channel_name);
 183                         cg->channels = g_slist_append(NULL, ch);
 184                         sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 185
 186                         /* Every channel gets a generator struct. */
 187                         ag = g_malloc(sizeof(struct analog_gen));
 188                         ag->ch = ch;
 189                         ag->mq = SR_MQ_VOLTAGE;
 190                         ag->mq_flags = SR_MQFLAG_DC;
 191                         ag->unit = SR_UNIT_VOLT;
 192                         ag->amplitude = DEFAULT_ANALOG_AMPLITUDE;
 193                         sr_analog_init(&ag->packet, &ag->encoding, &ag->meaning, &ag->spec, 2);
 194                         ag->packet.meaning->channels = cg->channels;
 195                         ag->packet.meaning->mq = ag->mq;
 196                         ag->packet.meaning->mqflags = ag->mq_flags;
 197                         ag->packet.meaning->unit = ag->unit;
 198                         ag->packet.encoding->digits = DEFAULT_ANALOG_ENCODING_DIGITS;
 199                         ag->packet.spec->spec_digits = DEFAULT_ANALOG_SPEC_DIGITS;
 200                         ag->packet.data = ag->pattern_data;
 201                         ag->pattern = pattern;
 202                         ag->avg_val = 0.0f;
 203                         ag->num_avgs = 0;
 204                         g_hash_table_insert(devc->ch_ag, ch, ag);
 205
 206                         if (++pattern == ARRAY_SIZE(analog_pattern_str))
 207                                 pattern = 0;
 208                 }
 209         }
 210
 211         sdi->priv = devc;
 212
 213         return std_scan_complete(di, g_slist_append(NULL, sdi));
 214 }
 215
 216 static void clear_helper(struct dev_context *devc)
 217 {
 218         GHashTableIter iter;
 219         void *value;
 220
 221         /* Analog generators. */
 222         g_hash_table_iter_init(&iter, devc->ch_ag);
 223         while (g_hash_table_iter_next(&iter, NULL, &value))
 224                 g_free(value);
 225         g_hash_table_unref(devc->ch_ag);
 226 }
 227
 228 static int dev_clear(const struct sr_dev_driver *di)
 229 {
 230         return std_dev_clear_with_callback(di, (std_dev_clear_callback)clear_helper);
 231 }
 232
 233 static int config_get(uint32_t key, GVariant **data,
 234         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 235 {
 236         struct dev_context *devc;
 237         struct sr_channel *ch;
 238         struct analog_gen *ag;
 239         GVariant *mq_arr[2];
 240         int pattern;
 241
 242         if (!sdi)
 243                 return SR_ERR_ARG;
 244
 245         devc = sdi->priv;
 246         switch (key) {
 247         case SR_CONF_SAMPLERATE:
 248                 *data = g_variant_new_uint64(devc->cur_samplerate);
 249                 break;
 250         case SR_CONF_LIMIT_SAMPLES:
 251                 *data = g_variant_new_uint64(devc->limit_samples);
 252                 break;
 253         case SR_CONF_LIMIT_MSEC:
 254                 *data = g_variant_new_uint64(devc->limit_msec);
 255                 break;
 256         case SR_CONF_LIMIT_FRAMES:
 257                 *data = g_variant_new_uint64(devc->limit_frames);
 258                 break;
 259         case SR_CONF_AVERAGING:
 260                 *data = g_variant_new_boolean(devc->avg);
 261                 break;
 262         case SR_CONF_AVG_SAMPLES:
 263                 *data = g_variant_new_uint64(devc->avg_samples);
 264                 break;
 265         case SR_CONF_MEASURED_QUANTITY:
 266                 if (!cg)
 267                         return SR_ERR_CHANNEL_GROUP;
 268                 /* Any channel in the group will do. */
 269                 ch = cg->channels->data;
 270                 if (ch->type != SR_CHANNEL_ANALOG)
 271                         return SR_ERR_ARG;
 272                 ag = g_hash_table_lookup(devc->ch_ag, ch);
 273                 mq_arr[0] = g_variant_new_uint32(ag->mq);
 274                 mq_arr[1] = g_variant_new_uint64(ag->mq_flags);
 275                 *data = g_variant_new_tuple(mq_arr, 2);
 276                 break;
 277         case SR_CONF_PATTERN_MODE:
 278                 if (!cg)
 279                         return SR_ERR_CHANNEL_GROUP;
 280                 /* Any channel in the group will do. */
 281                 ch = cg->channels->data;
 282                 if (ch->type == SR_CHANNEL_LOGIC) {
 283                         pattern = devc->logic_pattern;
 284                         *data = g_variant_new_string(logic_pattern_str[pattern]);
 285                 } else if (ch->type == SR_CHANNEL_ANALOG) {
 286                         ag = g_hash_table_lookup(devc->ch_ag, ch);
 287                         pattern = ag->pattern;
 288                         *data = g_variant_new_string(analog_pattern_str[pattern]);
 289                 } else
 290                         return SR_ERR_BUG;
 291                 break;
 292         case SR_CONF_AMPLITUDE:
 293                 if (!cg)
 294                         return SR_ERR_CHANNEL_GROUP;
 295                 /* Any channel in the group will do. */
 296                 ch = cg->channels->data;
 297                 if (ch->type != SR_CHANNEL_ANALOG)
 298                         return SR_ERR_ARG;
 299                 ag = g_hash_table_lookup(devc->ch_ag, ch);
 300                 *data = g_variant_new_double(ag->amplitude);
 301                 break;
 302         case SR_CONF_CAPTURE_RATIO:
 303                 *data = g_variant_new_uint64(devc->capture_ratio);
 304                 break;
 305         default:
 306                 return SR_ERR_NA;
 307         }
 308
 309         return SR_OK;
 310 }
 311
 312 static int config_set(uint32_t key, GVariant *data,
 313         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 314 {
 315         struct dev_context *devc;
 316         struct analog_gen *ag;
 317         struct sr_channel *ch;
 318         GVariant *mq_tuple_child;
 319         GSList *l;
 320         int logic_pattern, analog_pattern;
 321
 322         devc = sdi->priv;
 323
 324         switch (key) {
 325         case SR_CONF_SAMPLERATE:
 326                 devc->cur_samplerate = g_variant_get_uint64(data);
 327                 break;
 328         case SR_CONF_LIMIT_SAMPLES:
 329                 devc->limit_msec = 0;
 330                 devc->limit_samples = g_variant_get_uint64(data);
 331                 break;
 332         case SR_CONF_LIMIT_MSEC:
 333                 devc->limit_msec = g_variant_get_uint64(data);
 334                 devc->limit_samples = 0;
 335                 break;
 336         case SR_CONF_LIMIT_FRAMES:
 337                 devc->limit_frames = g_variant_get_uint64(data);
 338                 break;
 339         case SR_CONF_AVERAGING:
 340                 devc->avg = g_variant_get_boolean(data);
 341                 sr_dbg("%s averaging", devc->avg ? "Enabling" : "Disabling");
 342                 break;
 343         case SR_CONF_AVG_SAMPLES:
 344                 devc->avg_samples = g_variant_get_uint64(data);
 345                 sr_dbg("Setting averaging rate to %" PRIu64, devc->avg_samples);
 346                 break;
 347         case SR_CONF_MEASURED_QUANTITY:
 348                 if (!cg)
 349                         return SR_ERR_CHANNEL_GROUP;
 350                 for (l = cg->channels; l; l = l->next) {
 351                         ch = l->data;
 352                         if (ch->type != SR_CHANNEL_ANALOG)
 353                                 return SR_ERR_ARG;
 354                         ag = g_hash_table_lookup(devc->ch_ag, ch);
 355                         mq_tuple_child = g_variant_get_child_value(data, 0);
 356                         ag->mq = g_variant_get_uint32(mq_tuple_child);
 357                         mq_tuple_child = g_variant_get_child_value(data, 1);
 358                         ag->mq_flags = g_variant_get_uint64(mq_tuple_child);
 359                         g_variant_unref(mq_tuple_child);
 360                 }
 361                 break;
 362         case SR_CONF_PATTERN_MODE:
 363                 if (!cg)
 364                         return SR_ERR_CHANNEL_GROUP;
 365                 logic_pattern = std_str_idx(data, ARRAY_AND_SIZE(logic_pattern_str));
 366                 analog_pattern = std_str_idx(data, ARRAY_AND_SIZE(analog_pattern_str));
 367                 if (logic_pattern < 0 && analog_pattern < 0)
 368                         return SR_ERR_ARG;
 369                 for (l = cg->channels; l; l = l->next) {
 370                         ch = l->data;
 371                         if (ch->type == SR_CHANNEL_LOGIC) {
 372                                 if (logic_pattern == -1)
 373                                         return SR_ERR_ARG;
 374                                 sr_dbg("Setting logic pattern to %s",
 375                                                 logic_pattern_str[logic_pattern]);
 376                                 devc->logic_pattern = logic_pattern;
 377                                 /* Might as well do this now, these are static. */
 378                                 if (logic_pattern == PATTERN_ALL_LOW)
 379                                         memset(devc->logic_data, 0x00, LOGIC_BUFSIZE);
 380                                 else if (logic_pattern == PATTERN_ALL_HIGH)
 381                                         memset(devc->logic_data, 0xff, LOGIC_BUFSIZE);
 382                         } else if (ch->type == SR_CHANNEL_ANALOG) {
 383                                 if (analog_pattern == -1)
 384                                         return SR_ERR_ARG;
 385                                 sr_dbg("Setting analog pattern for channel %s to %s",
 386                                                 ch->name, analog_pattern_str[analog_pattern]);
 387                                 ag = g_hash_table_lookup(devc->ch_ag, ch);
 388                                 ag->pattern = analog_pattern;
 389                         } else
 390                                 return SR_ERR_BUG;
 391                 }
 392                 break;
 393         case SR_CONF_AMPLITUDE:
 394                 if (!cg)
 395                         return SR_ERR_CHANNEL_GROUP;
 396                 for (l = cg->channels; l; l = l->next) {
 397                         ch = l->data;
 398                         if (ch->type != SR_CHANNEL_ANALOG)
 399                                 return SR_ERR_ARG;
 400                         ag = g_hash_table_lookup(devc->ch_ag, ch);
 401                         ag->amplitude = g_variant_get_double(data);
 402                 }
 403                 break;
 404         case SR_CONF_CAPTURE_RATIO:
 405                 devc->capture_ratio = g_variant_get_uint64(data);
 406                 break;
 407         default:
 408                 return SR_ERR_NA;
 409         }
 410
 411         return SR_OK;
 412 }
 413
 414 static int config_list(uint32_t key, GVariant **data,
 415         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 416 {
 417         struct sr_channel *ch;
 418
 419         if (!cg) {
 420                 switch (key) {
 421                 case SR_CONF_SCAN_OPTIONS:
 422                 case SR_CONF_DEVICE_OPTIONS:
 423                         return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
 424                 case SR_CONF_SAMPLERATE:
 425                         *data = std_gvar_samplerates_steps(ARRAY_AND_SIZE(samplerates));
 426                         break;
 427                 case SR_CONF_TRIGGER_MATCH:
 428                         *data = std_gvar_array_i32(ARRAY_AND_SIZE(trigger_matches));
 429                         break;
 430                 default:
 431                         return SR_ERR_NA;
 432                 }
 433         } else {
 434                 ch = cg->channels->data;
 435                 switch (key) {
 436                 case SR_CONF_DEVICE_OPTIONS:
 437                         if (ch->type == SR_CHANNEL_LOGIC)
 438                                 *data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg_logic));
 439                         else if (ch->type == SR_CHANNEL_ANALOG) {
 440                                 if (strcmp(cg->name, "Analog") == 0)
 441                                         *data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg_analog_group));
 442                                 else
 443                                         *data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg_analog_channel));
 444                         }
 445                         else
 446                                 return SR_ERR_BUG;
 447                         break;
 448                 case SR_CONF_PATTERN_MODE:
 449                         /* The analog group (with all 4 channels) shall not have a pattern property. */
 450                         if (strcmp(cg->name, "Analog") == 0)
 451                                 return SR_ERR_NA;
 452
 453                         if (ch->type == SR_CHANNEL_LOGIC)
 454                                 *data = g_variant_new_strv(ARRAY_AND_SIZE(logic_pattern_str));
 455                         else if (ch->type == SR_CHANNEL_ANALOG)
 456                                 *data = g_variant_new_strv(ARRAY_AND_SIZE(analog_pattern_str));
 457                         else
 458                                 return SR_ERR_BUG;
 459                         break;
 460                 default:
 461                         return SR_ERR_NA;
 462                 }
 463         }
 464
 465         return SR_OK;
 466 }
 467
 468 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 469 {
 470         struct dev_context *devc;
 471         GSList *l;
 472         struct sr_channel *ch;
 473         int bitpos;
 474         uint8_t mask;
 475         GHashTableIter iter;
 476         void *value;
 477         struct sr_trigger *trigger;
 478
 479         devc = sdi->priv;
 480         devc->sent_samples = 0;
 481         devc->sent_frame_samples = 0;
 482
 483         /* Setup triggers */
 484         if ((trigger = sr_session_trigger_get(sdi->session))) {
 485                 int pre_trigger_samples = 0;
 486                 if (devc->limit_samples > 0)
 487                         pre_trigger_samples = (devc->capture_ratio * devc->limit_samples) / 100;
 488                 devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
 489                 if (!devc->stl)
 490                         return SR_ERR_MALLOC;
 491
 492                 /* Disable all analog channels since using them when there are logic
 493                  * triggers set up would require having pre-trigger sample buffers
 494                  * for analog sample data.
 495                  */
 496                 for (l = sdi->channels; l; l = l->next) {
 497                         ch = l->data;
 498                         if (ch->type == SR_CHANNEL_ANALOG)
 499                                 ch->enabled = FALSE;
 500                 }
 501         }
 502         devc->trigger_fired = FALSE;
 503
 504         /*
 505          * Determine the numbers of logic and analog channels that are
 506          * involved in the acquisition. Determine an offset and a mask to
 507          * remove excess logic data content before datafeed submission.
 508          */
 509         devc->enabled_logic_channels = 0;
 510         devc->enabled_analog_channels = 0;
 511         for (l = sdi->channels; l; l = l->next) {
 512                 ch = l->data;
 513                 if (!ch->enabled)
 514                         continue;
 515                 if (ch->type == SR_CHANNEL_ANALOG) {
 516                         devc->enabled_analog_channels++;
 517                         continue;
 518                 }
 519                 if (ch->type != SR_CHANNEL_LOGIC)
 520                         continue;
 521                 /*
 522                  * TODO: Need we create a channel map here, such that the
 523                  * session datafeed packets will have a dense representation
 524                  * of the enabled channels' data? For example store channels
 525                  * D3 and D5 in bit positions 0 and 1 respectively, when all
 526                  * other channels are disabled? The current implementation
 527                  * generates a sparse layout, might provide data for logic
 528                  * channels that are disabled while it might suppress data
 529                  * from enabled channels at the same time.
 530                  */
 531                 devc->enabled_logic_channels++;
 532         }
 533         devc->first_partial_logic_index = devc->enabled_logic_channels / 8;
 534         bitpos = devc->enabled_logic_channels % 8;
 535         mask = (1 << bitpos) - 1;
 536         devc->first_partial_logic_mask = mask;
 537         sr_dbg("num logic %zu, partial off %zu, mask 0x%02x.",
 538                 devc->enabled_logic_channels,
 539                 devc->first_partial_logic_index,
 540                 devc->first_partial_logic_mask);
 541
 542         /*
 543          * Have the waveform for analog patterns pre-generated. It's
 544          * supposed to be periodic, so the generator just needs to
 545          * access the prepared sample data (DDS style).
 546          */
 547         g_hash_table_iter_init(&iter, devc->ch_ag);
 548         while (g_hash_table_iter_next(&iter, NULL, &value))
 549                 demo_generate_analog_pattern(value, devc->cur_samplerate);
 550
 551         sr_session_source_add(sdi->session, -1, 0, 100,
 552                         demo_prepare_data, (struct sr_dev_inst *)sdi);
 553
 554         std_session_send_df_header(sdi);
 555
 556         if (devc->limit_frames > 0)
 557                 std_session_send_frame_begin(sdi);
 558
 559         /* We use this timestamp to decide how many more samples to send. */
 560         devc->start_us = g_get_monotonic_time();
 561         devc->spent_us = 0;
 562         devc->step = 0;
 563
 564         return SR_OK;
 565 }
 566
 567 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 568 {
 569         struct dev_context *devc;
 570
 571         sr_session_source_remove(sdi->session, -1);
 572
 573         devc = sdi->priv;
 574         if (devc->limit_frames > 0)
 575                 std_session_send_frame_end(sdi);
 576
 577         std_session_send_df_end(sdi);
 578
 579         if (devc->stl) {
 580                 soft_trigger_logic_free(devc->stl);
 581                 devc->stl = NULL;
 582         }
 583
 584         return SR_OK;
 585 }
 586
 587 static struct sr_dev_driver demo_driver_info = {
 588         .name = "demo",
 589         .longname = "Demo driver and pattern generator",
 590         .api_version = 1,
 591         .init = std_init,
 592         .cleanup = std_cleanup,
 593         .scan = scan,
 594         .dev_list = std_dev_list,
 595         .dev_clear = dev_clear,
 596         .config_get = config_get,
 597         .config_set = config_set,
 598         .config_list = config_list,
 599         .dev_open = std_dummy_dev_open,
 600         .dev_close = std_dummy_dev_close,
 601         .dev_acquisition_start = dev_acquisition_start,
 602         .dev_acquisition_stop = dev_acquisition_stop,
 603         .context = NULL,
 604 };
 605 SR_REGISTER_DEV_DRIVER(demo_driver_info);