src/hardware/lecroy-xstream/protocol.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2017 Sven Schnelle <svens@stackframe.org>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21 #include <math.h>
  22 #include <stdlib.h>
  23 #include "scpi.h"
  24 #include "protocol.h"
  25
  26 SR_PRIV void lecroy_queue_logic_data(struct dev_context *devc,
  27                                   size_t group, GByteArray *pod_data);
  28 SR_PRIV void lecroy_send_logic_packet(struct sr_dev_inst *sdi,
  29                                    struct dev_context *devc);
  30 SR_PRIV void lecroy_cleanup_logic_data(struct dev_context *devc);
  31
  32 struct lecroy_wavedesc_2_x {
  33         uint16_t comm_type;
  34         uint16_t comm_order; /* 1 - little endian */
  35         uint32_t wave_descriptor_length;
  36         uint32_t user_text_len;
  37         uint32_t res_desc1;
  38         uint32_t trigtime_array_length;
  39         uint32_t ris_time1_array_length;
  40         uint32_t res_array1;
  41         uint32_t wave_array1_length;
  42         uint32_t wave_array2_length;
  43         uint32_t wave_array3_length;
  44         uint32_t wave_array4_length;
  45         char instrument_name[16];
  46         uint32_t instrument_number;
  47         char trace_label[16];
  48         uint32_t reserved;
  49         uint32_t wave_array_count;
  50         uint32_t points_per_screen;
  51         uint32_t first_valid_point;
  52         uint32_t last_valid_point;
  53         uint32_t first_point;
  54         uint32_t sparsing_factor;
  55         uint32_t segment_index;
  56         uint32_t subarray_count;
  57         uint32_t sweeps_per_acq;
  58         uint16_t points_per_pair;
  59         uint16_t pair_offset;
  60         float vertical_gain;
  61         float vertical_offset;
  62         float max_value;
  63         float min_value;
  64         uint16_t nominal_bits;
  65         uint16_t nom_subarray_count;
  66         float horiz_interval;
  67         double horiz_offset;
  68         double pixel_offset;
  69         char vertunit[48];
  70         char horunit[48];
  71         uint32_t reserved1;
  72         double trigger_time;
  73 } __attribute__((packed));
  74
  75 struct lecroy_wavedesc {
  76         char descriptor_name[16];
  77         char template_name[16];
  78         union {
  79                 struct lecroy_wavedesc_2_x version_2_x;
  80         };
  81 } __attribute__((packed));
  82
  83 static const uint32_t lecroy_devopts[] = {
  84         SR_CONF_OSCILLOSCOPE,
  85         SR_CONF_LIMIT_FRAMES | SR_CONF_GET | SR_CONF_SET,
  86         SR_CONF_TRIGGER_SOURCE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  87         SR_CONF_TIMEBASE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  88         SR_CONF_NUM_HDIV | SR_CONF_GET,
  89         SR_CONF_TRIGGER_SLOPE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  90         SR_CONF_HORIZ_TRIGGERPOS | SR_CONF_GET | SR_CONF_SET,
  91         SR_CONF_SAMPLERATE | SR_CONF_GET,
  92 };
  93
  94 static const uint32_t lecroy_analog_devopts[] = {
  95         SR_CONF_NUM_VDIV | SR_CONF_GET,
  96         SR_CONF_COUPLING | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  97         SR_CONF_VDIV | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  98 };
  99
 100 static const char *lecroy_coupling_options[] = {
 101         "A1M", // AC with 1 MOhm termination
 102         "D50",  // DC with 50 Ohm termination
 103         "D1M", // DC with 1 MOhm termination
 104         "GND",
 105         "OVL",
 106         NULL,
 107 };
 108
 109 static const char *scope_trigger_slopes[] = {
 110         "POS",
 111         "NEG",
 112         NULL,
 113 };
 114
 115 static const char *lecroy_xstream_trigger_sources[] = {
 116         "C1",
 117         "C2",
 118         "C3",
 119         "C4",
 120         "LINE",
 121         "EXT",
 122         NULL,
 123 };
 124
 125 static const struct sr_rational lecroy_timebases[] = {
 126         /* picoseconds */
 127         { 20, 1000000000000 },
 128         { 50, 1000000000000 },
 129         { 100, 1000000000000 },
 130         { 200, 1000000000000 },
 131         { 500, 1000000000000 },
 132         /* nanoseconds */
 133         { 1, 1000000000 },
 134         { 2, 1000000000 },
 135         { 5, 1000000000 },
 136         { 10, 1000000000 },
 137         { 20, 1000000000 },
 138         { 50, 1000000000 },
 139         { 100, 1000000000 },
 140         { 200, 1000000000 },
 141         { 500, 1000000000 },
 142         /* microseconds */
 143         { 1, 1000000 },
 144         { 2, 1000000 },
 145         { 5, 1000000 },
 146         { 10, 1000000 },
 147         { 20, 1000000 },
 148         { 50, 1000000 },
 149         { 100, 1000000 },
 150         { 200, 1000000 },
 151         { 500, 1000000 },
 152         /* milliseconds */
 153         { 1, 1000 },
 154         { 2, 1000 },
 155         { 5, 1000 },
 156         { 10, 1000 },
 157         { 20, 1000 },
 158         { 50, 1000 },
 159         { 100, 1000 },
 160         { 200, 1000 },
 161         { 500, 1000 },
 162         /* seconds */
 163         { 1, 1 },
 164         { 2, 1 },
 165         { 5, 1 },
 166         { 10, 1 },
 167         { 20, 1 },
 168         { 50, 1 },
 169         { 100, 1 },
 170         { 200, 1 },
 171         { 500, 1 },
 172         { 1000, 1 },
 173 };
 174
 175 static const struct sr_rational lecroy_vdivs[] = {
 176         /* millivolts */
 177         { 1, 1000 },
 178         { 2, 1000 },
 179         { 5, 1000 },
 180         { 10, 1000 },
 181         { 20, 1000 },
 182         { 50, 1000 },
 183         { 100, 1000 },
 184         { 200, 1000 },
 185         { 500, 1000 },
 186         /* volts */
 187         { 1, 1 },
 188         { 2, 1 },
 189         { 5, 1 },
 190         { 10, 1 },
 191         { 20, 1 },
 192         { 50, 1 },
 193 };
 194
 195 static const char *scope_analog_channel_names[] = {
 196         "CH1",
 197         "CH2",
 198         "CH3",
 199         "CH4",
 200 };
 201
 202 static const struct scope_config scope_models[] = {
 203         {
 204                 .name = { "WP7000", "WP7100", "WP7200", "WP7300" },
 205
 206                 .analog_channels = 4,
 207                 .analog_names = &scope_analog_channel_names,
 208
 209                 .devopts = &lecroy_devopts,
 210                 .num_devopts = ARRAY_SIZE(lecroy_devopts),
 211
 212                 .analog_devopts = &lecroy_analog_devopts,
 213                 .num_analog_devopts = ARRAY_SIZE(lecroy_analog_devopts),
 214
 215                 .coupling_options = &lecroy_coupling_options,
 216                 .trigger_sources = &lecroy_xstream_trigger_sources,
 217                 .trigger_slopes = &scope_trigger_slopes,
 218
 219                 .timebases = lecroy_timebases,
 220                 .num_timebases = ARRAY_SIZE(lecroy_timebases),
 221
 222                 .vdivs = lecroy_vdivs,
 223                 .num_vdivs = ARRAY_SIZE(lecroy_vdivs),
 224
 225                 .num_xdivs = 10,
 226                 .num_ydivs = 8,
 227         },
 228 };
 229
 230 static void scope_state_dump(const struct scope_config *config,
 231                              struct scope_state *state)
 232 {
 233         unsigned int i;
 234         char *tmp;
 235
 236         for (i = 0; i < config->analog_channels; i++) {
 237                 tmp = sr_voltage_string(config->vdivs[state->analog_channels[i].vdiv].p,
 238                                         config->vdivs[state->analog_channels[i].vdiv].q);
 239                 sr_info("State of analog channel %d -> %s : %s (coupling) %s (vdiv) %2.2e (offset)",
 240                         i + 1, state->analog_channels[i].state ? "On" : "Off",
 241                         (*config->coupling_options)[state->analog_channels[i].coupling],
 242                         tmp, state->analog_channels[i].vertical_offset);
 243         }
 244
 245         tmp = sr_period_string_f(1.0/(((float)config->timebases[state->timebase].p) /
 246                                       ((float)config->timebases[state->timebase].q)), 0);
 247         sr_info("Current timebase: %s", tmp);
 248         g_free(tmp);
 249
 250         tmp = sr_samplerate_string(state->sample_rate);
 251         sr_info("Current samplerate: %s", tmp);
 252         g_free(tmp);
 253
 254         sr_info("Current trigger: %s (source), %s (slope) %.2f (offset)",
 255                 (*config->trigger_sources)[state->trigger_source],
 256                 (*config->trigger_slopes)[state->trigger_slope],
 257                 state->horiz_triggerpos);
 258 }
 259
 260 static int scope_state_get_array_option(const char *resp,
 261                                         const char *(*array)[],
 262                                         int *result)
 263 {
 264         unsigned int i;
 265
 266         for (i = 0; (*array)[i]; i++) {
 267                 if (!g_strcmp0(resp, (*array)[i])) {
 268                         *result = i;
 269                         return SR_OK;
 270                 }
 271         }
 272
 273         return SR_ERR;
 274 }
 275
 276 /**
 277  * This function takes a value of the form "2.000E-03" and returns the index
 278  * of an array where a matching pair was found.
 279  *
 280  * @param value The string to be parsed.
 281  * @param array The array of s/f pairs.
 282  * @param array_len The number of pairs in the array.
 283  * @param result The index at which a matching pair was found.
 284  *
 285  * @return SR_ERR on any parsing error, SR_OK otherwise.
 286  */
 287 static int array_float_get(gchar *value, const struct sr_rational *aval,
 288                 int array_len, unsigned int *result)
 289 {
 290         struct sr_rational rval;
 291
 292         if (sr_parse_rational(value, &rval) != SR_OK)
 293                 return SR_ERR;
 294
 295         for (int i = 0; i < array_len; i++) {
 296                 if (sr_rational_eq(&rval, aval+i)) {
 297                         *result = i;
 298                         return SR_OK;
 299                 }
 300         }
 301
 302         return SR_ERR;
 303 }
 304
 305 static int analog_channel_state_get(struct sr_scpi_dev_inst *scpi,
 306                                     const struct scope_config *config,
 307                                     struct scope_state *state)
 308 {
 309         unsigned int i, j;
 310         char command[MAX_COMMAND_SIZE];
 311         char *tmp_str;
 312
 313         for (i = 0; i < config->analog_channels; i++) {
 314                 g_snprintf(command, sizeof(command), "C%d:TRACE?", i+1);
 315
 316                 if (sr_scpi_get_bool(scpi, command,
 317                                         &state->analog_channels[i].state) != SR_OK)
 318                         return SR_ERR;
 319
 320                 g_snprintf(command, sizeof(command), "C%d:VDIV?", i+1);
 321
 322                 if (sr_scpi_get_string(scpi, command, &tmp_str) != SR_OK)
 323                         return SR_ERR;
 324
 325                 if (array_float_get(tmp_str, lecroy_vdivs, ARRAY_SIZE(lecroy_vdivs),
 326                                     &j) != SR_OK) {
 327                         g_free(tmp_str);
 328                         sr_err("Could not determine array index for vertical div scale.");
 329                         return SR_ERR;
 330                 }
 331
 332                 g_free(tmp_str);
 333                 state->analog_channels[i].vdiv = j;
 334
 335                 g_snprintf(command, sizeof(command), "C%d:OFFSET?", i+1);
 336
 337                 if (sr_scpi_get_float(scpi, command, &state->analog_channels[i].vertical_offset) != SR_OK)
 338                         return SR_ERR;
 339
 340                 g_snprintf(command, sizeof(command), "C%d:COUPLING?", i+1);
 341
 342                 if (sr_scpi_get_string(scpi, command, &tmp_str) != SR_OK)
 343                         return SR_ERR;
 344
 345
 346                 if (scope_state_get_array_option(tmp_str, config->coupling_options,
 347                                          &state->analog_channels[i].coupling) != SR_OK)
 348                         return SR_ERR;
 349
 350                 g_free(tmp_str);
 351         }
 352
 353         return SR_OK;
 354 }
 355
 356 SR_PRIV int lecroy_xstream_update_sample_rate(const struct sr_dev_inst *sdi)
 357 {
 358         struct dev_context *devc;
 359         struct scope_state *state;
 360         const struct scope_config *config;
 361         float memsize, timediv;
 362
 363         devc = sdi->priv;
 364         state = devc->model_state;
 365         config = devc->model_config;
 366
 367         if (sr_scpi_get_float(sdi->conn, "MEMORY_SIZE?", &memsize) != SR_OK)
 368                         return SR_ERR;
 369
 370         if (sr_scpi_get_float(sdi->conn, "TIME_DIV?", &timediv) != SR_OK)
 371                 return SR_ERR;
 372
 373         state->sample_rate = 1/((timediv * config->num_xdivs) / memsize);
 374
 375         return SR_OK;
 376 }
 377
 378 SR_PRIV int lecroy_xstream_state_get(struct sr_dev_inst *sdi)
 379 {
 380         struct dev_context *devc;
 381         struct scope_state *state
 382 ;       const struct scope_config *config;
 383         unsigned int i;
 384         char *tmp_str, *tmp_str2, *tmpp, *p, *key;
 385         char command[MAX_COMMAND_SIZE];
 386         char *trig_source = NULL;
 387
 388         devc = sdi->priv;
 389         config = devc->model_config;
 390         state = devc->model_state;
 391
 392         sr_info("Fetching scope state");
 393
 394         if (analog_channel_state_get(sdi->conn, config, state) != SR_OK)
 395                 return SR_ERR;
 396
 397         if (sr_scpi_get_string(sdi->conn, "TIME_DIV?", &tmp_str) != SR_OK)
 398                 return SR_ERR;
 399
 400         if (array_float_get(tmp_str, lecroy_timebases, ARRAY_SIZE(lecroy_timebases),
 401                             &i) != SR_OK) {
 402                 g_free(tmp_str);
 403                 sr_err("Could not determine array index for timbase scale.");
 404                 return SR_ERR;
 405         }
 406         g_free(tmp_str);
 407         state->timebase = i;
 408
 409         if (sr_scpi_get_string(sdi->conn, "TRIG_SELECT?", &tmp_str) != SR_OK)
 410                 return SR_ERR;
 411
 412         tmp_str2 = tmp_str;
 413         i = 0;
 414         while((p = strtok_r(tmp_str2, ",", &tmpp))) {
 415                 tmp_str2 = NULL;
 416                 if (i == 0) {
 417                         /* trigger type */
 418                 } else if (i & 1) {
 419                         key = p;
 420                         /* key */
 421                 } else if (!(i & 1)) {
 422                         if (!strcmp(key, "SR"))
 423                                 trig_source = p;
 424                 }
 425                 i++;
 426         }
 427
 428         if (!trig_source || scope_state_get_array_option(trig_source, config->trigger_sources,
 429                                                         &state->trigger_source) != SR_OK)
 430                 return SR_ERR;
 431
 432
 433         g_snprintf(command, sizeof(command), "%s:TRIG_SLOPE?", trig_source);
 434         if (sr_scpi_get_string(sdi->conn, command, &tmp_str) != SR_OK)
 435                 return SR_ERR;
 436
 437         if (scope_state_get_array_option(tmp_str,
 438                 config->trigger_slopes, &state->trigger_slope) != SR_OK)
 439                 return SR_ERR;
 440
 441         if (sr_scpi_get_float(sdi->conn, "TRIG_DELAY?", &state->horiz_triggerpos) != SR_OK)
 442                 return SR_ERR;
 443
 444         if (lecroy_xstream_update_sample_rate(sdi) != SR_OK)
 445                 return SR_ERR;
 446
 447         sr_info("Fetching finished.");
 448
 449         scope_state_dump(config, state);
 450
 451         return SR_OK;
 452 }
 453
 454 static struct scope_state *scope_state_new(const struct scope_config *config)
 455 {
 456         struct scope_state *state;
 457
 458         state = g_malloc0(sizeof(struct scope_state));
 459         state->analog_channels = g_malloc0_n(config->analog_channels,
 460                         sizeof(struct analog_channel_state));
 461         return state;
 462 }
 463
 464 SR_PRIV void lecroy_xstream_state_free(struct scope_state *state)
 465 {
 466         g_free(state->analog_channels);
 467         g_free(state);
 468 }
 469
 470 SR_PRIV int lecroy_xstream_init_device(struct sr_dev_inst *sdi)
 471 {
 472         char command[MAX_COMMAND_SIZE];
 473         int model_index;
 474         unsigned int i, j;
 475         struct sr_channel *ch;
 476         struct dev_context *devc;
 477         gboolean channel_enabled;
 478
 479         devc = sdi->priv;
 480         model_index = -1;
 481
 482         /* Find the exact model. */
 483         for (i = 0; i < ARRAY_SIZE(scope_models); i++) {
 484                 for (j = 0; scope_models[i].name[j]; j++) {
 485                         if (!strcmp(sdi->model, scope_models[i].name[j])) {
 486                                 model_index = i;
 487                                 break;
 488                         }
 489                 }
 490                 if (model_index != -1)
 491                         break;
 492         }
 493
 494         if (model_index == -1) {
 495                 sr_dbg("Unsupported LECROY device.");
 496                 return SR_ERR_NA;
 497         }
 498
 499         devc->analog_groups = g_malloc0(sizeof(struct sr_channel_group*) *
 500                                         scope_models[model_index].analog_channels);
 501
 502         /* Add analog channels. */
 503         for (i = 0; i < scope_models[model_index].analog_channels; i++) {
 504
 505                 g_snprintf(command, sizeof(command), "C%d:TRACE?", i+1);
 506
 507                 if (sr_scpi_get_bool(sdi->conn, command, &channel_enabled) != SR_OK)
 508                         return SR_ERR;
 509
 510                 g_snprintf(command, sizeof(command), "C%d:VDIV?", i+1);
 511
 512                 ch = sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, channel_enabled,
 513                            (*scope_models[model_index].analog_names)[i]);
 514
 515                 devc->analog_groups[i] = g_malloc0(sizeof(struct sr_channel_group));
 516
 517                 devc->analog_groups[i]->name = g_strdup(
 518                         (char *)(*scope_models[model_index].analog_names)[i]);
 519                 devc->analog_groups[i]->channels = g_slist_append(NULL, ch);
 520
 521                 sdi->channel_groups = g_slist_append(sdi->channel_groups,
 522                                                    devc->analog_groups[i]);
 523         }
 524
 525         devc->model_config = &scope_models[model_index];
 526         devc->frame_limit = 0;
 527
 528         if (!(devc->model_state = scope_state_new(devc->model_config)))
 529                 return SR_ERR_MALLOC;
 530
 531         return SR_OK;
 532 }
 533
 534 static int lecroy_waveform_2_x_to_analog(GByteArray *data,
 535                                          struct lecroy_wavedesc *desc,
 536                                          struct sr_datafeed_analog *analog)
 537 {
 538         struct sr_analog_encoding *encoding = analog->encoding;
 539         struct sr_analog_meaning *meaning = analog->meaning;
 540         struct sr_analog_spec *spec = analog->spec;
 541         float *data_float;
 542         int16_t *waveform_data;
 543         unsigned int i, num_samples;
 544
 545         data_float  = g_malloc(desc->version_2_x.wave_array_count * sizeof(float));
 546         num_samples = desc->version_2_x.wave_array_count;
 547
 548         waveform_data = (int16_t *)(data->data +
 549                                     + desc->version_2_x.wave_descriptor_length
 550                                     + desc->version_2_x.user_text_len);
 551
 552         for(i = 0; i  < num_samples; i++)
 553                 data_float[i] = (float)waveform_data[i]
 554                         * desc->version_2_x.vertical_gain
 555                         + desc->version_2_x.vertical_offset;
 556
 557
 558         analog->data = data_float;
 559         analog->num_samples = num_samples;
 560
 561         encoding->unitsize = sizeof(float);
 562         encoding->is_signed = TRUE;
 563         encoding->is_float = TRUE;
 564         encoding->is_bigendian = FALSE;
 565         encoding->scale.p = 1;
 566         encoding->scale.q = 1;
 567         encoding->offset.p = 0;
 568         encoding->offset.q = 1;
 569
 570         encoding->digits = 6;
 571         encoding->is_digits_decimal = FALSE;
 572
 573         if (strcmp(desc->version_2_x.vertunit, "A")) {
 574                 meaning->mq = SR_MQ_CURRENT;
 575                 meaning->unit = SR_UNIT_AMPERE;
 576         } else {
 577                 /* default to voltage */
 578                 meaning->mq = SR_MQ_VOLTAGE;
 579                 meaning->unit = SR_UNIT_VOLT;
 580         }
 581
 582         meaning->mqflags = 0;
 583         spec->spec_digits = 3;
 584         return SR_OK;
 585 }
 586
 587 static int lecroy_waveform_to_analog(GByteArray *data,
 588                                      struct sr_datafeed_analog *analog)
 589 {
 590         struct lecroy_wavedesc *desc;
 591
 592         if (data->len < sizeof(struct lecroy_wavedesc))
 593                 return SR_ERR;
 594
 595         desc = (struct lecroy_wavedesc *)data->data;
 596
 597         if (!strncmp(desc->template_name, "LECROY_2_2", 16) ||
 598             !strncmp(desc->template_name, "LECROY_2_3", 16)) {
 599                 return lecroy_waveform_2_x_to_analog(data, desc, analog);
 600         }
 601
 602         sr_err("Waveformat template '%.16s' not supported\n", desc->template_name);
 603         return SR_ERR;
 604 }
 605
 606 SR_PRIV int lecroy_xstream_receive_data(int fd, int revents, void *cb_data)
 607 {
 608         struct sr_channel *ch;
 609         struct sr_dev_inst *sdi;
 610         struct dev_context *devc;
 611         struct sr_datafeed_packet packet;
 612         GByteArray *data;
 613         struct sr_datafeed_analog analog;
 614         struct sr_analog_encoding encoding;
 615         struct sr_analog_meaning meaning;
 616         struct sr_analog_spec spec;
 617         char buf[8];
 618         (void)fd;
 619         (void)revents;
 620
 621         data = NULL;
 622
 623         if (!(sdi = cb_data))
 624                 return TRUE;
 625
 626         if (!(devc = sdi->priv))
 627                 return TRUE;
 628
 629         ch = devc->current_channel->data;
 630
 631         /*
 632          * Send "frame begin" packet upon reception of data for the
 633          * first enabled channel.
 634          */
 635         if (devc->current_channel == devc->enabled_channels) {
 636                 packet.type = SR_DF_FRAME_BEGIN;
 637                 sr_session_send(sdi, &packet);
 638         }
 639
 640         if (ch->type != SR_CHANNEL_ANALOG)
 641                 return SR_ERR;
 642         /*
 643          * Pass on the received data of the channel(s).
 644          */
 645         if (sr_scpi_read_data(sdi->conn, buf, 4) != 4) {
 646                 sr_err("reading header failed\n");
 647                 return TRUE;
 648         }
 649
 650         if (sr_scpi_get_block(sdi->conn, NULL, &data) != SR_OK) {
 651                 if (data)
 652                         g_byte_array_free(data, TRUE);
 653                 return TRUE;
 654         }
 655
 656         analog.encoding = &encoding;
 657         analog.meaning = &meaning;
 658         analog.spec = &spec;
 659
 660         if (lecroy_waveform_to_analog(data, &analog) != SR_OK)
 661                 return SR_ERR;
 662
 663         meaning.channels = g_slist_append(NULL, ch);
 664         packet.payload = &analog;
 665         packet.type = SR_DF_ANALOG;
 666         sr_session_send(sdi, &packet);
 667
 668         g_byte_array_free(data, TRUE);
 669         data = NULL;
 670
 671         g_slist_free(meaning.channels);
 672         g_free(analog.data);
 673
 674
 675         /*
 676          * Advance to the next enabled channel. When data for all enabled
 677          * channels was received, then flush potentially queued logic data,
 678          * and send the "frame end" packet.
 679          */
 680         if (devc->current_channel->next) {
 681                 devc->current_channel = devc->current_channel->next;
 682                 lecroy_xstream_request_data(sdi);
 683                 return TRUE;
 684         }
 685
 686         packet.type = SR_DF_FRAME_END;
 687         sr_session_send(sdi, &packet);
 688
 689         /*
 690          * End of frame was reached. Stop acquisition after the specified
 691          * number of frames, or continue reception by starting over at
 692          * the first enabled channel.
 693          */
 694         if (++devc->num_frames == devc->frame_limit) {
 695                 sdi->driver->dev_acquisition_stop(sdi);
 696         } else {
 697                 devc->current_channel = devc->enabled_channels;
 698                 lecroy_xstream_request_data(sdi);
 699         }
 700
 701         return TRUE;
 702 }