src/hardware/hameg-hmo/protocol.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2013 poljar (Damir Jelić) <poljarinho@gmail.com>
   5  * Copyright (C) 2018 Guido Trentalancia <guido@trentalancia.com>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <config.h>
  22 #include <math.h>
  23 #include <stdlib.h>
  24 #include "scpi.h"
  25 #include "protocol.h"
  26
  27 SR_PRIV void hmo_queue_logic_data(struct dev_context *devc,
  28                                   size_t group, GByteArray *pod_data);
  29 SR_PRIV void hmo_send_logic_packet(struct sr_dev_inst *sdi,
  30                                    struct dev_context *devc);
  31 SR_PRIV void hmo_cleanup_logic_data(struct dev_context *devc);
  32
  33 static const char *hameg_scpi_dialect[] = {
  34         [SCPI_CMD_GET_DIG_DATA]               = ":FORM UINT,8;:POD%d:DATA?",
  35         [SCPI_CMD_GET_TIMEBASE]               = ":TIM:SCAL?",
  36         [SCPI_CMD_SET_TIMEBASE]               = ":TIM:SCAL %s",
  37         [SCPI_CMD_GET_COUPLING]               = ":CHAN%d:COUP?",
  38         [SCPI_CMD_SET_COUPLING]               = ":CHAN%d:COUP %s",
  39         [SCPI_CMD_GET_SAMPLE_RATE]            = ":ACQ:SRAT?",
  40         [SCPI_CMD_GET_SAMPLE_RATE_LIVE]       = ":%s:DATA:POINTS?",
  41         [SCPI_CMD_GET_ANALOG_DATA]            = ":FORM:BORD %s;" \
  42                                                 ":FORM REAL,32;:CHAN%d:DATA?",
  43         [SCPI_CMD_GET_VERTICAL_DIV]           = ":CHAN%d:SCAL?",
  44         [SCPI_CMD_SET_VERTICAL_DIV]           = ":CHAN%d:SCAL %s",
  45         [SCPI_CMD_GET_DIG_POD_STATE]          = ":POD%d:STAT?",
  46         [SCPI_CMD_SET_DIG_POD_STATE]          = ":POD%d:STAT %d",
  47         [SCPI_CMD_GET_TRIGGER_SLOPE]          = ":TRIG:A:EDGE:SLOP?",
  48         [SCPI_CMD_SET_TRIGGER_SLOPE]          = ":TRIG:A:TYPE EDGE;:TRIG:A:EDGE:SLOP %s",
  49         [SCPI_CMD_GET_TRIGGER_PATTERN]        = ":TRIG:A:PATT:SOUR?",
  50         [SCPI_CMD_SET_TRIGGER_PATTERN]        = ":TRIG:A:TYPE LOGIC;" \
  51                                                 ":TRIG:A:PATT:FUNC AND;" \
  52                                                 ":TRIG:A:PATT:COND TRUE;" \
  53                                                 ":TRIG:A:PATT:MODE OFF;" \
  54                                                 ":TRIG:A:PATT:SOUR \"%s\"",
  55         [SCPI_CMD_GET_TRIGGER_SOURCE]         = ":TRIG:A:SOUR?",
  56         [SCPI_CMD_SET_TRIGGER_SOURCE]         = ":TRIG:A:SOUR %s",
  57         [SCPI_CMD_GET_DIG_CHAN_STATE]         = ":LOG%d:STAT?",
  58         [SCPI_CMD_SET_DIG_CHAN_STATE]         = ":LOG%d:STAT %d",
  59         [SCPI_CMD_GET_VERTICAL_OFFSET]        = ":CHAN%d:POS?",
  60         [SCPI_CMD_GET_HORIZ_TRIGGERPOS]       = ":TIM:POS?",
  61         [SCPI_CMD_SET_HORIZ_TRIGGERPOS]       = ":TIM:POS %s",
  62         [SCPI_CMD_GET_ANALOG_CHAN_STATE]      = ":CHAN%d:STAT?",
  63         [SCPI_CMD_SET_ANALOG_CHAN_STATE]      = ":CHAN%d:STAT %d",
  64         [SCPI_CMD_GET_PROBE_UNIT]             = ":PROB%d:SET:ATT:UNIT?",
  65         [SCPI_CMD_GET_DIG_POD_THRESHOLD]      = ":POD%d:THR?",
  66         [SCPI_CMD_SET_DIG_POD_THRESHOLD]      = ":POD%d:THR %s",
  67         [SCPI_CMD_GET_DIG_POD_USER_THRESHOLD] = ":POD%d:THR:UDL%d?",
  68         [SCPI_CMD_SET_DIG_POD_USER_THRESHOLD] = ":POD%d:THR:UDL%d %s",
  69 };
  70
  71 static const uint32_t devopts[] = {
  72         SR_CONF_OSCILLOSCOPE,
  73         SR_CONF_LIMIT_SAMPLES | SR_CONF_SET,
  74         SR_CONF_LIMIT_FRAMES | SR_CONF_SET,
  75         SR_CONF_SAMPLERATE | SR_CONF_GET,
  76         SR_CONF_TIMEBASE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  77         SR_CONF_NUM_HDIV | SR_CONF_GET,
  78         SR_CONF_HORIZ_TRIGGERPOS | SR_CONF_GET | SR_CONF_SET,
  79         SR_CONF_TRIGGER_SOURCE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  80         SR_CONF_TRIGGER_SLOPE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  81         SR_CONF_TRIGGER_PATTERN | SR_CONF_GET | SR_CONF_SET,
  82 };
  83
  84 static const uint32_t devopts_cg_analog[] = {
  85         SR_CONF_NUM_VDIV | SR_CONF_GET,
  86         SR_CONF_VDIV | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  87         SR_CONF_COUPLING | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  88 };
  89
  90 static const uint32_t devopts_cg_digital[] = {
  91         SR_CONF_LOGIC_THRESHOLD | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  92         SR_CONF_LOGIC_THRESHOLD_CUSTOM | SR_CONF_GET | SR_CONF_SET,
  93 };
  94
  95 static const char *coupling_options[] = {
  96         "AC",  // AC with 50 Ohm termination (152x, 202x, 30xx, 1202)
  97         "ACL", // AC with 1 MOhm termination
  98         "DC",  // DC with 50 Ohm termination
  99         "DCL", // DC with 1 MOhm termination
 100         "GND",
 101 };
 102
 103 static const char *scope_trigger_slopes[] = {
 104         "POS",
 105         "NEG",
 106         "EITH",
 107 };
 108
 109 /* Predefined logic thresholds. */
 110 static const char *logic_threshold[] = {
 111         "TTL",
 112         "ECL",
 113         "CMOS",
 114         "USER1",
 115         "USER2", // overwritten by logic_threshold_custom, use USER1 for permanent setting
 116 };
 117
 118 /* RTC1002, HMO Compact2 and HMO1002/HMO1202 */
 119 static const char *an2_dig8_trigger_sources[] = {
 120         "CH1", "CH2",
 121         "LINE", "EXT", "PATT", "BUS1", "BUS2",
 122         "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",
 123 };
 124
 125 /* HMO3xx2 */
 126 static const char *an2_dig16_trigger_sources[] = {
 127         "CH1", "CH2",
 128         "LINE", "EXT", "PATT", "BUS1", "BUS2",
 129         "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",
 130         "D8", "D9", "D10", "D11", "D12", "D13", "D14", "D15",
 131 };
 132
 133 /* HMO Compact4 */
 134 static const char *an4_dig8_trigger_sources[] = {
 135         "CH1", "CH2", "CH3", "CH4",
 136         "LINE", "EXT", "PATT", "BUS1", "BUS2",
 137         "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",
 138 };
 139
 140 /* HMO3xx4 and HMO2524 */
 141 static const char *an4_dig16_trigger_sources[] = {
 142         "CH1", "CH2", "CH3", "CH4",
 143         "LINE", "EXT", "PATT", "BUS1", "BUS2",
 144         "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",
 145         "D8", "D9", "D10", "D11", "D12", "D13", "D14", "D15",
 146 };
 147
 148 static const uint64_t timebases[][2] = {
 149         /* nanoseconds */
 150         { 2, 1000000000 },
 151         { 5, 1000000000 },
 152         { 10, 1000000000 },
 153         { 20, 1000000000 },
 154         { 50, 1000000000 },
 155         { 100, 1000000000 },
 156         { 200, 1000000000 },
 157         { 500, 1000000000 },
 158         /* microseconds */
 159         { 1, 1000000 },
 160         { 2, 1000000 },
 161         { 5, 1000000 },
 162         { 10, 1000000 },
 163         { 20, 1000000 },
 164         { 50, 1000000 },
 165         { 100, 1000000 },
 166         { 200, 1000000 },
 167         { 500, 1000000 },
 168         /* milliseconds */
 169         { 1, 1000 },
 170         { 2, 1000 },
 171         { 5, 1000 },
 172         { 10, 1000 },
 173         { 20, 1000 },
 174         { 50, 1000 },
 175         { 100, 1000 },
 176         { 200, 1000 },
 177         { 500, 1000 },
 178         /* seconds */
 179         { 1, 1 },
 180         { 2, 1 },
 181         { 5, 1 },
 182         { 10, 1 },
 183         { 20, 1 },
 184         { 50, 1 },
 185 };
 186
 187 static const uint64_t vdivs[][2] = {
 188         /* millivolts */
 189         { 1, 1000 },
 190         { 2, 1000 },
 191         { 5, 1000 },
 192         { 10, 1000 },
 193         { 20, 1000 },
 194         { 50, 1000 },
 195         { 100, 1000 },
 196         { 200, 1000 },
 197         { 500, 1000 },
 198         /* volts */
 199         { 1, 1 },
 200         { 2, 1 },
 201         { 5, 1 },
 202         { 10, 1 },
 203         { 20, 1 },
 204         { 50, 1 },
 205 };
 206
 207 static const char *scope_analog_channel_names[] = {
 208         "CH1", "CH2", "CH3", "CH4",
 209 };
 210
 211 static const char *scope_digital_channel_names[] = {
 212         "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",
 213         "D8", "D9", "D10", "D11", "D12", "D13", "D14", "D15",
 214 };
 215
 216 static const struct scope_config scope_models[] = {
 217         {
 218                 /* RTC1002 and HMO722/1002/1022/1202/1522/2022 support only 8 digital channels. */
 219                 .name = {"RTC1002", "HMO722", "HMO1002", "HMO1022", "HMO1202", "HMO1522", "HMO2022", NULL},
 220                 .analog_channels = 2,
 221                 .digital_channels = 8,
 222                 .digital_pods = 1,
 223
 224                 .analog_names = &scope_analog_channel_names,
 225                 .digital_names = &scope_digital_channel_names,
 226
 227                 .devopts = &devopts,
 228                 .num_devopts = ARRAY_SIZE(devopts),
 229
 230                 .devopts_cg_analog = &devopts_cg_analog,
 231                 .num_devopts_cg_analog = ARRAY_SIZE(devopts_cg_analog),
 232
 233                 .devopts_cg_digital = &devopts_cg_digital,
 234                 .num_devopts_cg_digital = ARRAY_SIZE(devopts_cg_digital),
 235
 236                 .coupling_options = &coupling_options,
 237                 .num_coupling_options = ARRAY_SIZE(coupling_options),
 238
 239                 .logic_threshold = &logic_threshold,
 240                 .num_logic_threshold = ARRAY_SIZE(logic_threshold),
 241
 242                 .trigger_sources = &an2_dig8_trigger_sources,
 243                 .num_trigger_sources = ARRAY_SIZE(an2_dig8_trigger_sources),
 244
 245                 .trigger_slopes = &scope_trigger_slopes,
 246                 .num_trigger_slopes = ARRAY_SIZE(scope_trigger_slopes),
 247
 248                 .timebases = &timebases,
 249                 .num_timebases = ARRAY_SIZE(timebases),
 250
 251                 .vdivs = &vdivs,
 252                 .num_vdivs = ARRAY_SIZE(vdivs),
 253
 254                 .num_xdivs = 12,
 255                 .num_ydivs = 8,
 256
 257                 .scpi_dialect = &hameg_scpi_dialect,
 258         },
 259         {
 260                 /* HMO3032/3042/3052/3522 support 16 digital channels. */
 261                 .name = {"HMO3032", "HMO3042", "HMO3052", "HMO3522", NULL},
 262                 .analog_channels = 2,
 263                 .digital_channels = 16,
 264                 .digital_pods = 2,
 265
 266                 .analog_names = &scope_analog_channel_names,
 267                 .digital_names = &scope_digital_channel_names,
 268
 269                 .devopts = &devopts,
 270                 .num_devopts = ARRAY_SIZE(devopts),
 271
 272                 .devopts_cg_analog = &devopts_cg_analog,
 273                 .num_devopts_cg_analog = ARRAY_SIZE(devopts_cg_analog),
 274
 275                 .devopts_cg_digital = &devopts_cg_digital,
 276                 .num_devopts_cg_digital = ARRAY_SIZE(devopts_cg_digital),
 277
 278                 .coupling_options = &coupling_options,
 279                 .num_coupling_options = ARRAY_SIZE(coupling_options),
 280
 281                 .logic_threshold = &logic_threshold,
 282                 .num_logic_threshold = ARRAY_SIZE(logic_threshold),
 283
 284                 .trigger_sources = &an2_dig16_trigger_sources,
 285                 .num_trigger_sources = ARRAY_SIZE(an2_dig16_trigger_sources),
 286
 287                 .trigger_slopes = &scope_trigger_slopes,
 288                 .num_trigger_slopes = ARRAY_SIZE(scope_trigger_slopes),
 289
 290                 .timebases = &timebases,
 291                 .num_timebases = ARRAY_SIZE(timebases),
 292
 293                 .vdivs = &vdivs,
 294                 .num_vdivs = ARRAY_SIZE(vdivs),
 295
 296                 .num_xdivs = 12,
 297                 .num_ydivs = 8,
 298
 299                 .scpi_dialect = &hameg_scpi_dialect,
 300         },
 301         {
 302                 .name = {"HMO724", "HMO1024", "HMO1524", "HMO2024", NULL},
 303                 .analog_channels = 4,
 304                 .digital_channels = 8,
 305                 .digital_pods = 1,
 306
 307                 .analog_names = &scope_analog_channel_names,
 308                 .digital_names = &scope_digital_channel_names,
 309
 310                 .devopts = &devopts,
 311                 .num_devopts = ARRAY_SIZE(devopts),
 312
 313                 .devopts_cg_analog = &devopts_cg_analog,
 314                 .num_devopts_cg_analog = ARRAY_SIZE(devopts_cg_analog),
 315
 316                 .devopts_cg_digital = &devopts_cg_digital,
 317                 .num_devopts_cg_digital = ARRAY_SIZE(devopts_cg_digital),
 318
 319                 .coupling_options = &coupling_options,
 320                 .num_coupling_options = ARRAY_SIZE(coupling_options),
 321
 322                 .logic_threshold = &logic_threshold,
 323                 .num_logic_threshold = ARRAY_SIZE(logic_threshold),
 324
 325                 .trigger_sources = &an4_dig8_trigger_sources,
 326                 .num_trigger_sources = ARRAY_SIZE(an4_dig8_trigger_sources),
 327
 328                 .trigger_slopes = &scope_trigger_slopes,
 329                 .num_trigger_slopes = ARRAY_SIZE(scope_trigger_slopes),
 330
 331                 .timebases = &timebases,
 332                 .num_timebases = ARRAY_SIZE(timebases),
 333
 334                 .vdivs = &vdivs,
 335                 .num_vdivs = ARRAY_SIZE(vdivs),
 336
 337                 .num_xdivs = 12,
 338                 .num_ydivs = 8,
 339
 340                 .scpi_dialect = &hameg_scpi_dialect,
 341         },
 342         {
 343                 .name = {"HMO2524", "HMO3034", "HMO3044", "HMO3054", "HMO3524", NULL},
 344                 .analog_channels = 4,
 345                 .digital_channels = 16,
 346                 .digital_pods = 2,
 347
 348                 .analog_names = &scope_analog_channel_names,
 349                 .digital_names = &scope_digital_channel_names,
 350
 351                 .devopts = &devopts,
 352                 .num_devopts = ARRAY_SIZE(devopts),
 353
 354                 .devopts_cg_analog = &devopts_cg_analog,
 355                 .num_devopts_cg_analog = ARRAY_SIZE(devopts_cg_analog),
 356
 357                 .devopts_cg_digital = &devopts_cg_digital,
 358                 .num_devopts_cg_digital = ARRAY_SIZE(devopts_cg_digital),
 359
 360                 .coupling_options = &coupling_options,
 361                 .num_coupling_options = ARRAY_SIZE(coupling_options),
 362
 363                 .logic_threshold = &logic_threshold,
 364                 .num_logic_threshold = ARRAY_SIZE(logic_threshold),
 365
 366                 .trigger_sources = &an4_dig16_trigger_sources,
 367                 .num_trigger_sources = ARRAY_SIZE(an4_dig16_trigger_sources),
 368
 369                 .trigger_slopes = &scope_trigger_slopes,
 370                 .num_trigger_slopes = ARRAY_SIZE(scope_trigger_slopes),
 371
 372                 .timebases = &timebases,
 373                 .num_timebases = ARRAY_SIZE(timebases),
 374
 375                 .vdivs = &vdivs,
 376                 .num_vdivs = ARRAY_SIZE(vdivs),
 377
 378                 .num_xdivs = 12,
 379                 .num_ydivs = 8,
 380
 381                 .scpi_dialect = &hameg_scpi_dialect,
 382         },
 383 };
 384
 385 static void scope_state_dump(const struct scope_config *config,
 386                              struct scope_state *state)
 387 {
 388         unsigned int i;
 389         char *tmp;
 390
 391         for (i = 0; i < config->analog_channels; i++) {
 392                 tmp = sr_voltage_string((*config->vdivs)[state->analog_channels[i].vdiv][0],
 393                                              (*config->vdivs)[state->analog_channels[i].vdiv][1]);
 394                 sr_info("State of analog channel %d -> %s : %s (coupling) %s (vdiv) %2.2e (offset)",
 395                         i + 1, state->analog_channels[i].state ? "On" : "Off",
 396                         (*config->coupling_options)[state->analog_channels[i].coupling],
 397                         tmp, state->analog_channels[i].vertical_offset);
 398         }
 399
 400         for (i = 0; i < config->digital_channels; i++) {
 401                 sr_info("State of digital channel %d -> %s", i,
 402                         state->digital_channels[i] ? "On" : "Off");
 403         }
 404
 405         for (i = 0; i < config->digital_pods; i++) {
 406                 if (strncmp("USER", (*config->logic_threshold)[state->digital_pods[i].threshold], 4))
 407                         sr_info("State of digital POD %d -> %s : %s (threshold)", i + 1,
 408                                 state->digital_pods[i].state ? "On" : "Off",
 409                                 (*config->logic_threshold)[state->digital_pods[i].threshold]);
 410                 else // user-defined or custom logic threshold
 411                         sr_info("State of digital POD %d -> %s : %E (threshold)", i + 1,
 412                                 state->digital_pods[i].state ? "On" : "Off",
 413                                 state->digital_pods[i].user_threshold);
 414         }
 415
 416         tmp = sr_period_string((*config->timebases)[state->timebase][0],
 417                                (*config->timebases)[state->timebase][1]);
 418         sr_info("Current timebase: %s", tmp);
 419         g_free(tmp);
 420
 421         tmp = sr_samplerate_string(state->sample_rate);
 422         sr_info("Current samplerate: %s", tmp);
 423         g_free(tmp);
 424
 425         if (!strcmp("PATT", (*config->trigger_sources)[state->trigger_source]))
 426                 sr_info("Current trigger: %s (pattern), %.2f (offset)",
 427                         state->trigger_pattern,
 428                         state->horiz_triggerpos);
 429         else // Edge (slope) trigger
 430                 sr_info("Current trigger: %s (source), %s (slope) %.2f (offset)",
 431                         (*config->trigger_sources)[state->trigger_source],
 432                         (*config->trigger_slopes)[state->trigger_slope],
 433                         state->horiz_triggerpos);
 434 }
 435
 436 static int scope_state_get_array_option(struct sr_scpi_dev_inst *scpi,
 437                 const char *command, const char *(*array)[], unsigned int n, int *result)
 438 {
 439         char *tmp;
 440         int idx;
 441
 442         if (sr_scpi_get_string(scpi, command, &tmp) != SR_OK)
 443                 return SR_ERR;
 444
 445         if ((idx = std_str_idx_s(tmp, *array, n)) < 0) {
 446                 g_free(tmp);
 447                 return SR_ERR_ARG;
 448         }
 449
 450         *result = idx;
 451
 452         g_free(tmp);
 453
 454         return SR_OK;
 455 }
 456
 457 /**
 458  * This function takes a value of the form "2.000E-03" and returns the index
 459  * of an array where a matching pair was found.
 460  *
 461  * @param value The string to be parsed.
 462  * @param array The array of s/f pairs.
 463  * @param array_len The number of pairs in the array.
 464  * @param result The index at which a matching pair was found.
 465  *
 466  * @return SR_ERR on any parsing error, SR_OK otherwise.
 467  */
 468 static int array_float_get(gchar *value, const uint64_t array[][2],
 469                 int array_len, unsigned int *result)
 470 {
 471         struct sr_rational rval;
 472         struct sr_rational aval;
 473
 474         if (sr_parse_rational(value, &rval) != SR_OK)
 475                 return SR_ERR;
 476
 477         for (int i = 0; i < array_len; i++) {
 478                 sr_rational_set(&aval, array[i][0], array[i][1]);
 479                 if (sr_rational_eq(&rval, &aval)) {
 480                         *result = i;
 481                         return SR_OK;
 482                 }
 483         }
 484
 485         return SR_ERR;
 486 }
 487
 488 static struct sr_channel *get_channel_by_index_and_type(GSList *channel_lhead,
 489                                                         int index, int type)
 490 {
 491         while (channel_lhead) {
 492                 struct sr_channel *ch = channel_lhead->data;
 493                 if (ch->index == index && ch->type == type)
 494                         return ch;
 495
 496                 channel_lhead = channel_lhead->next;
 497         }
 498
 499         return 0;
 500 }
 501
 502 static int analog_channel_state_get(struct sr_dev_inst *sdi,
 503                                     const struct scope_config *config,
 504                                     struct scope_state *state)
 505 {
 506         unsigned int i, j;
 507         char command[MAX_COMMAND_SIZE];
 508         char *tmp_str;
 509         struct sr_channel *ch;
 510         struct sr_scpi_dev_inst *scpi = sdi->conn;
 511
 512         for (i = 0; i < config->analog_channels; i++) {
 513                 g_snprintf(command, sizeof(command),
 514                            (*config->scpi_dialect)[SCPI_CMD_GET_ANALOG_CHAN_STATE],
 515                            i + 1);
 516
 517                 if (sr_scpi_get_bool(scpi, command,
 518                                      &state->analog_channels[i].state) != SR_OK)
 519                         return SR_ERR;
 520
 521                 ch = get_channel_by_index_and_type(sdi->channels, i, SR_CHANNEL_ANALOG);
 522                 if (ch)
 523                         ch->enabled = state->analog_channels[i].state;
 524
 525                 g_snprintf(command, sizeof(command),
 526                            (*config->scpi_dialect)[SCPI_CMD_GET_VERTICAL_DIV],
 527                            i + 1);
 528
 529                 if (sr_scpi_get_string(scpi, command, &tmp_str) != SR_OK)
 530                         return SR_ERR;
 531
 532                 if (array_float_get(tmp_str, ARRAY_AND_SIZE(vdivs), &j) != SR_OK) {
 533                         g_free(tmp_str);
 534                         sr_err("Could not determine array index for vertical div scale.");
 535                         return SR_ERR;
 536                 }
 537
 538                 g_free(tmp_str);
 539                 state->analog_channels[i].vdiv = j;
 540
 541                 g_snprintf(command, sizeof(command),
 542                            (*config->scpi_dialect)[SCPI_CMD_GET_VERTICAL_OFFSET],
 543                            i + 1);
 544
 545                 if (sr_scpi_get_float(scpi, command,
 546                                      &state->analog_channels[i].vertical_offset) != SR_OK)
 547                         return SR_ERR;
 548
 549                 g_snprintf(command, sizeof(command),
 550                            (*config->scpi_dialect)[SCPI_CMD_GET_COUPLING],
 551                            i + 1);
 552
 553                 if (scope_state_get_array_option(scpi, command, config->coupling_options,
 554                                          config->num_coupling_options,
 555                                          &state->analog_channels[i].coupling) != SR_OK)
 556                         return SR_ERR;
 557
 558                 g_snprintf(command, sizeof(command),
 559                            (*config->scpi_dialect)[SCPI_CMD_GET_PROBE_UNIT],
 560                            i + 1);
 561
 562                 if (sr_scpi_get_string(scpi, command, &tmp_str) != SR_OK)
 563                         return SR_ERR;
 564
 565                 if (tmp_str[0] == 'A')
 566                         state->analog_channels[i].probe_unit = 'A';
 567                 else
 568                         state->analog_channels[i].probe_unit = 'V';
 569                 g_free(tmp_str);
 570         }
 571
 572         return SR_OK;
 573 }
 574
 575 static int digital_channel_state_get(struct sr_dev_inst *sdi,
 576                                      const struct scope_config *config,
 577                                      struct scope_state *state)
 578 {
 579         unsigned int i;
 580         int result = SR_ERR;
 581         static char *logic_threshold_short[] = {};
 582         char command[MAX_COMMAND_SIZE];
 583         struct sr_channel *ch;
 584         struct sr_scpi_dev_inst *scpi = sdi->conn;
 585
 586         for (i = 0; i < config->digital_channels; i++) {
 587                 g_snprintf(command, sizeof(command),
 588                            (*config->scpi_dialect)[SCPI_CMD_GET_DIG_CHAN_STATE],
 589                            i);
 590
 591                 if (sr_scpi_get_bool(scpi, command,
 592                                      &state->digital_channels[i]) != SR_OK)
 593                         return SR_ERR;
 594
 595                 ch = get_channel_by_index_and_type(sdi->channels, i, SR_CHANNEL_LOGIC);
 596                 if (ch)
 597                         ch->enabled = state->digital_channels[i];
 598         }
 599
 600         /* According to the SCPI standard, the response to the command
 601          * SCPI_CMD_GET_DIG_POD_THRESHOLD might return "USER" instead of
 602          * "USER1".
 603          *
 604          * This makes more difficult to validate the response when the logic
 605          * threshold is set to "USER1" and therefore we need to prevent device
 606          * opening failures in such configuration case...
 607          */
 608         for (i = 0; i < config->num_logic_threshold; i++) {
 609                 logic_threshold_short[i] = g_strdup((*config->logic_threshold)[i]);
 610                 if (!strcmp("USER1", (*config->logic_threshold)[i]))
 611                         g_strlcpy(logic_threshold_short[i],
 612                                   (*config->logic_threshold)[i], strlen((*config->logic_threshold)[i]));
 613         }
 614
 615         for (i = 0; i < config->digital_pods; i++) {
 616                 g_snprintf(command, sizeof(command),
 617                            (*config->scpi_dialect)[SCPI_CMD_GET_DIG_POD_STATE],
 618                            i + 1);
 619
 620                 if (sr_scpi_get_bool(scpi, command,
 621                                      &state->digital_pods[i].state) != SR_OK)
 622                         goto exit;
 623
 624                 g_snprintf(command, sizeof(command),
 625                            (*config->scpi_dialect)[SCPI_CMD_GET_DIG_POD_THRESHOLD],
 626                            i + 1);
 627
 628                 /* Check for both standard and shortened responses. */
 629                 if (scope_state_get_array_option(scpi, command, config->logic_threshold,
 630                                                  config->num_logic_threshold,
 631                                                  &state->digital_pods[i].threshold) != SR_OK)
 632                         if (scope_state_get_array_option(scpi, command, (const char * (*)[]) &logic_threshold_short,
 633                                                          config->num_logic_threshold,
 634                                                          &state->digital_pods[i].threshold) != SR_OK)
 635                                 goto exit;
 636
 637                 if (!strcmp("USER1", (*config->logic_threshold)[state->digital_pods[i].threshold]))
 638                         g_snprintf(command, sizeof(command),
 639                                    (*config->scpi_dialect)[SCPI_CMD_GET_DIG_POD_USER_THRESHOLD],
 640                                    i + 1, 1); // USER1 logic threshold setting
 641
 642                 if (!strcmp("USER2", (*config->logic_threshold)[state->digital_pods[i].threshold]))
 643                         g_snprintf(command, sizeof(command),
 644                                    (*config->scpi_dialect)[SCPI_CMD_GET_DIG_POD_USER_THRESHOLD],
 645                                    i + 1, 2); // USER2 for custom logic_threshold setting
 646
 647                 if (!strcmp("USER1", (*config->logic_threshold)[state->digital_pods[i].threshold]) ||
 648                     !strcmp("USER2", (*config->logic_threshold)[state->digital_pods[i].threshold]))
 649                         if (sr_scpi_get_float(scpi, command,
 650                             &state->digital_pods[i].user_threshold) != SR_OK)
 651                                 goto exit;
 652         }
 653
 654         result = SR_OK;
 655
 656 exit:
 657         for (i = 0; i < config->num_logic_threshold; i++)
 658                 g_free(logic_threshold_short[i]);
 659
 660         return result;
 661 }
 662
 663 SR_PRIV int hmo_update_sample_rate(const struct sr_dev_inst *sdi)
 664 {
 665         struct dev_context *devc;
 666         struct scope_state *state;
 667         const struct scope_config *config;
 668         int tmp;
 669         unsigned int i;
 670         float tmp_float;
 671         gboolean channel_found;
 672         char tmp_str[MAX_COMMAND_SIZE];
 673         char chan_name[20];
 674
 675         devc = sdi->priv;
 676         config = devc->model_config;
 677         state = devc->model_state;
 678         channel_found = FALSE;
 679
 680         for (i = 0; i < config->analog_channels; i++) {
 681                 if (!state->analog_channels[i].state)
 682                         continue;
 683                 g_snprintf(chan_name, sizeof(chan_name), "CHAN%d", i + 1);
 684                 g_snprintf(tmp_str, sizeof(tmp_str),
 685                            (*config->scpi_dialect)[SCPI_CMD_GET_SAMPLE_RATE_LIVE],
 686                            chan_name);
 687                 channel_found = TRUE;
 688                 break;
 689         }
 690
 691         if (!channel_found) {
 692                 for (i = 0; i < config->digital_pods; i++) {
 693                         if (!state->digital_pods[i].state)
 694                                 continue;
 695                         g_snprintf(chan_name, sizeof(chan_name), "POD%d", i);
 696                         g_snprintf(tmp_str, sizeof(tmp_str),
 697                                    (*config->scpi_dialect)[SCPI_CMD_GET_SAMPLE_RATE_LIVE],
 698                                    chan_name);
 699                         channel_found = TRUE;
 700                         break;
 701                 }
 702         }
 703
 704         /* No channel is active, ask the instrument for the sample rate
 705          * in single shot mode */
 706         if (!channel_found) {
 707                 if (sr_scpi_get_float(sdi->conn,
 708                                       (*config->scpi_dialect)[SCPI_CMD_GET_SAMPLE_RATE],
 709                                       &tmp_float) != SR_OK)
 710                         return SR_ERR;
 711
 712                 state->sample_rate = tmp_float;
 713         } else {
 714                 if (sr_scpi_get_int(sdi->conn, tmp_str, &tmp) != SR_OK)
 715                         return SR_ERR;
 716                 state->sample_rate = tmp / (((float) (*config->timebases)[state->timebase][0] /
 717                                              (*config->timebases)[state->timebase][1]) *
 718                                             config->num_xdivs);
 719         }
 720
 721         return SR_OK;
 722 }
 723
 724 SR_PRIV int hmo_scope_state_get(struct sr_dev_inst *sdi)
 725 {
 726         struct dev_context *devc;
 727         struct scope_state *state;
 728         const struct scope_config *config;
 729         float tmp_float;
 730         unsigned int i;
 731         char *tmp_str;
 732
 733         devc = sdi->priv;
 734         config = devc->model_config;
 735         state = devc->model_state;
 736
 737         sr_info("Fetching scope state");
 738
 739         if (analog_channel_state_get(sdi, config, state) != SR_OK)
 740                 return SR_ERR;
 741
 742         if (digital_channel_state_get(sdi, config, state) != SR_OK)
 743                 return SR_ERR;
 744
 745         if (sr_scpi_get_float(sdi->conn,
 746                         (*config->scpi_dialect)[SCPI_CMD_GET_TIMEBASE],
 747                         &tmp_float) != SR_OK)
 748                 return SR_ERR;
 749
 750         if (sr_scpi_get_string(sdi->conn,
 751                         (*config->scpi_dialect)[SCPI_CMD_GET_TIMEBASE],
 752                         &tmp_str) != SR_OK)
 753                 return SR_ERR;
 754
 755         if (array_float_get(tmp_str, ARRAY_AND_SIZE(timebases), &i) != SR_OK) {
 756                 g_free(tmp_str);
 757                 sr_err("Could not determine array index for time base.");
 758                 return SR_ERR;
 759         }
 760         g_free(tmp_str);
 761
 762         state->timebase = i;
 763
 764         if (sr_scpi_get_float(sdi->conn,
 765                         (*config->scpi_dialect)[SCPI_CMD_GET_HORIZ_TRIGGERPOS],
 766                         &tmp_float) != SR_OK)
 767                 return SR_ERR;
 768         state->horiz_triggerpos = tmp_float /
 769                 (((double) (*config->timebases)[state->timebase][0] /
 770                   (*config->timebases)[state->timebase][1]) * config->num_xdivs);
 771         state->horiz_triggerpos -= 0.5;
 772         state->horiz_triggerpos *= -1;
 773
 774         if (scope_state_get_array_option(sdi->conn,
 775                         (*config->scpi_dialect)[SCPI_CMD_GET_TRIGGER_SOURCE],
 776                         config->trigger_sources, config->num_trigger_sources,
 777                         &state->trigger_source) != SR_OK)
 778                 return SR_ERR;
 779
 780         if (scope_state_get_array_option(sdi->conn,
 781                         (*config->scpi_dialect)[SCPI_CMD_GET_TRIGGER_SLOPE],
 782                         config->trigger_slopes, config->num_trigger_slopes,
 783                         &state->trigger_slope) != SR_OK)
 784                 return SR_ERR;
 785
 786         if (sr_scpi_get_string(sdi->conn,
 787                                (*config->scpi_dialect)[SCPI_CMD_GET_TRIGGER_PATTERN],
 788                                &state->trigger_pattern) != SR_OK)
 789                 return SR_ERR;
 790
 791         if (hmo_update_sample_rate(sdi) != SR_OK)
 792                 return SR_ERR;
 793
 794         sr_info("Fetching finished.");
 795
 796         scope_state_dump(config, state);
 797
 798         return SR_OK;
 799 }
 800
 801 static struct scope_state *scope_state_new(const struct scope_config *config)
 802 {
 803         struct scope_state *state;
 804
 805         state = g_malloc0(sizeof(struct scope_state));
 806         state->analog_channels = g_malloc0_n(config->analog_channels,
 807                         sizeof(struct analog_channel_state));
 808         state->digital_channels = g_malloc0_n(
 809                         config->digital_channels, sizeof(gboolean));
 810         state->digital_pods = g_malloc0_n(config->digital_pods,
 811                         sizeof(struct digital_pod_state));
 812
 813         return state;
 814 }
 815
 816 SR_PRIV void hmo_scope_state_free(struct scope_state *state)
 817 {
 818         g_free(state->analog_channels);
 819         g_free(state->digital_channels);
 820         g_free(state->digital_pods);
 821         g_free(state);
 822 }
 823
 824 SR_PRIV int hmo_init_device(struct sr_dev_inst *sdi)
 825 {
 826         int model_index;
 827         unsigned int i, j, group;
 828         struct sr_channel *ch;
 829         struct dev_context *devc;
 830         int ret;
 831
 832         devc = sdi->priv;
 833         model_index = -1;
 834
 835         /* Find the exact model. */
 836         for (i = 0; i < ARRAY_SIZE(scope_models); i++) {
 837                 for (j = 0; scope_models[i].name[j]; j++) {
 838                         if (!strcmp(sdi->model, scope_models[i].name[j])) {
 839                                 model_index = i;
 840                                 break;
 841                         }
 842                 }
 843                 if (model_index != -1)
 844                         break;
 845         }
 846
 847         if (model_index == -1) {
 848                 sr_dbg("Unsupported device.");
 849                 return SR_ERR_NA;
 850         }
 851
 852         devc->analog_groups = g_malloc0(sizeof(struct sr_channel_group*) *
 853                                         scope_models[model_index].analog_channels);
 854         devc->digital_groups = g_malloc0(sizeof(struct sr_channel_group*) *
 855                                          scope_models[model_index].digital_pods);
 856         if (!devc->analog_groups || !devc->digital_groups) {
 857                 g_free(devc->analog_groups);
 858                 g_free(devc->digital_groups);
 859                 return SR_ERR_MALLOC;
 860         }
 861
 862         /* Add analog channels. */
 863         for (i = 0; i < scope_models[model_index].analog_channels; i++) {
 864                 ch = sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE,
 865                            (*scope_models[model_index].analog_names)[i]);
 866
 867                 devc->analog_groups[i] = g_malloc0(sizeof(struct sr_channel_group));
 868
 869                 devc->analog_groups[i]->name = g_strdup(
 870                         (char *)(*scope_models[model_index].analog_names)[i]);
 871                 devc->analog_groups[i]->channels = g_slist_append(NULL, ch);
 872
 873                 sdi->channel_groups = g_slist_append(sdi->channel_groups,
 874                                                    devc->analog_groups[i]);
 875         }
 876
 877         /* Add digital channel groups. */
 878         ret = SR_OK;
 879         for (i = 0; i < scope_models[model_index].digital_pods; i++) {
 880                 devc->digital_groups[i] = g_malloc0(sizeof(struct sr_channel_group));
 881                 if (!devc->digital_groups[i]) {
 882                         ret = SR_ERR_MALLOC;
 883                         break;
 884                 }
 885                 devc->digital_groups[i]->name = g_strdup_printf("POD%d", i + 1);
 886                 sdi->channel_groups = g_slist_append(sdi->channel_groups,
 887                                    devc->digital_groups[i]);
 888         }
 889         if (ret != SR_OK)
 890                 return ret;
 891
 892         /* Add digital channels. */
 893         for (i = 0; i < scope_models[model_index].digital_channels; i++) {
 894                 ch = sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE,
 895                            (*scope_models[model_index].digital_names)[i]);
 896
 897                 group = i / 8;
 898                 devc->digital_groups[group]->channels = g_slist_append(
 899                         devc->digital_groups[group]->channels, ch);
 900         }
 901
 902         devc->model_config = &scope_models[model_index];
 903         devc->samples_limit = 0;
 904         devc->frame_limit = 0;
 905
 906         if (!(devc->model_state = scope_state_new(devc->model_config)))
 907                 return SR_ERR_MALLOC;
 908
 909         return SR_OK;
 910 }
 911
 912 /* Queue data of one channel group, for later submission. */
 913 SR_PRIV void hmo_queue_logic_data(struct dev_context *devc,
 914                                   size_t group, GByteArray *pod_data)
 915 {
 916         size_t size;
 917         GByteArray *store;
 918         uint8_t *logic_data;
 919         size_t idx, logic_step;
 920
 921         /*
 922          * Upon first invocation, allocate the array which can hold the
 923          * combined logic data for all channels. Assume that each channel
 924          * will yield an identical number of samples per receive call.
 925          *
 926          * As a poor man's safety measure: (Silently) skip processing
 927          * for unexpected sample counts, and ignore samples for
 928          * unexpected channel groups. Don't bother with complicated
 929          * resize logic, considering that many models only support one
 930          * pod, and the most capable supported models have two pods of
 931          * identical size. We haven't yet seen any "odd" configuration.
 932          */
 933         if (!devc->logic_data) {
 934                 size = pod_data->len * devc->pod_count;
 935                 store = g_byte_array_sized_new(size);
 936                 memset(store->data, 0, size);
 937                 store = g_byte_array_set_size(store, size);
 938                 devc->logic_data = store;
 939         } else {
 940                 store = devc->logic_data;
 941                 size = store->len / devc->pod_count;
 942                 if (group >= devc->pod_count)
 943                         return;
 944         }
 945
 946         /*
 947          * Fold the data of the most recently received channel group into
 948          * the storage, where data resides for all channels combined.
 949          */
 950         logic_data = store->data;
 951         logic_data += group;
 952         logic_step = devc->pod_count;
 953         for (idx = 0; idx < pod_data->len; idx++) {
 954                 *logic_data = pod_data->data[idx];
 955                 logic_data += logic_step;
 956         }
 957
 958         /* Truncate acquisition if a smaller number of samples has been requested. */
 959         if (devc->samples_limit > 0 && devc->logic_data->len > devc->samples_limit * devc->pod_count)
 960                 devc->logic_data->len = devc->samples_limit * devc->pod_count;
 961 }
 962
 963 /* Submit data for all channels, after the individual groups got collected. */
 964 SR_PRIV void hmo_send_logic_packet(struct sr_dev_inst *sdi,
 965                                    struct dev_context *devc)
 966 {
 967         struct sr_datafeed_packet packet;
 968         struct sr_datafeed_logic logic;
 969
 970         if (!devc->logic_data)
 971                 return;
 972
 973         logic.data = devc->logic_data->data;
 974         logic.length = devc->logic_data->len;
 975         logic.unitsize = devc->pod_count;
 976
 977         packet.type = SR_DF_LOGIC;
 978         packet.payload = &logic;
 979
 980         sr_session_send(sdi, &packet);
 981 }
 982
 983 /* Undo previous resource allocation. */
 984 SR_PRIV void hmo_cleanup_logic_data(struct dev_context *devc)
 985 {
 986
 987         if (devc->logic_data) {
 988                 g_byte_array_free(devc->logic_data, TRUE);
 989                 devc->logic_data = NULL;
 990         }
 991         /*
 992          * Keep 'pod_count'! It's required when more frames will be
 993          * received, and does not harm when kept after acquisition.
 994          */
 995 }
 996
 997 SR_PRIV int hmo_receive_data(int fd, int revents, void *cb_data)
 998 {
 999         struct sr_channel *ch;
1000         struct sr_dev_inst *sdi;
1001         struct dev_context *devc;
1002         struct scope_state *state;
1003         struct sr_datafeed_packet packet;
1004         GByteArray *data;
1005         struct sr_datafeed_analog analog;
1006         struct sr_analog_encoding encoding;
1007         struct sr_analog_meaning meaning;
1008         struct sr_analog_spec spec;
1009         struct sr_datafeed_logic logic;
1010         size_t group;
1011
1012         (void)fd;
1013         (void)revents;
1014
1015         data = NULL;
1016
1017         if (!(sdi = cb_data))
1018                 return TRUE;
1019
1020         if (!(devc = sdi->priv))
1021                 return TRUE;
1022
1023         /* Although this is correct in general, the USBTMC libusb implementation
1024          * currently does not generate an event prior to the first read. Often
1025          * it is ok to start reading just after the 50ms timeout. See bug #785.
1026         if (revents != G_IO_IN)
1027                 return TRUE;
1028         */
1029
1030         ch = devc->current_channel->data;
1031         state = devc->model_state;
1032
1033         /*
1034          * Send "frame begin" packet upon reception of data for the
1035          * first enabled channel.
1036          */
1037         if (devc->current_channel == devc->enabled_channels) {
1038                 packet.type = SR_DF_FRAME_BEGIN;
1039                 sr_session_send(sdi, &packet);
1040         }
1041
1042         /*
1043          * Pass on the received data of the channel(s).
1044          */
1045         switch (ch->type) {
1046         case SR_CHANNEL_ANALOG:
1047                 if (sr_scpi_get_block(sdi->conn, NULL, &data) != SR_OK) {
1048                         if (data)
1049                                 g_byte_array_free(data, TRUE);
1050                         return TRUE;
1051                 }
1052
1053                 packet.type = SR_DF_ANALOG;
1054
1055                 analog.data = data->data;
1056                 analog.num_samples = data->len / sizeof(float);
1057                 /* Truncate acquisition if a smaller number of samples has been requested. */
1058                 if (devc->samples_limit > 0 && analog.num_samples > devc->samples_limit)
1059                         analog.num_samples = devc->samples_limit;
1060                 analog.encoding = &encoding;
1061                 analog.meaning = &meaning;
1062                 analog.spec = &spec;
1063
1064                 encoding.unitsize = sizeof(float);
1065                 encoding.is_signed = TRUE;
1066                 encoding.is_float = TRUE;
1067 #ifdef WORDS_BIGENDIAN
1068                 encoding.is_bigendian = TRUE;
1069 #else
1070                 encoding.is_bigendian = FALSE;
1071 #endif
1072                 /* TODO: Use proper 'digits' value for this device (and its modes). */
1073                 encoding.digits = 2;
1074                 encoding.is_digits_decimal = FALSE;
1075                 encoding.scale.p = 1;
1076                 encoding.scale.q = 1;
1077                 encoding.offset.p = 0;
1078                 encoding.offset.q = 1;
1079                 if (state->analog_channels[ch->index].probe_unit == 'V') {
1080                         meaning.mq = SR_MQ_VOLTAGE;
1081                         meaning.unit = SR_UNIT_VOLT;
1082                 } else {
1083                         meaning.mq = SR_MQ_CURRENT;
1084                         meaning.unit = SR_UNIT_AMPERE;
1085                 }
1086                 meaning.mqflags = 0;
1087                 meaning.channels = g_slist_append(NULL, ch);
1088                 /* TODO: Use proper 'digits' value for this device (and its modes). */
1089                 spec.spec_digits = 2;
1090                 packet.payload = &analog;
1091                 sr_session_send(sdi, &packet);
1092                 devc->num_samples = data->len / sizeof(float);
1093                 g_slist_free(meaning.channels);
1094                 g_byte_array_free(data, TRUE);
1095                 data = NULL;
1096                 break;
1097         case SR_CHANNEL_LOGIC:
1098                 if (sr_scpi_get_block(sdi->conn, NULL, &data) != SR_OK) {
1099                         if (data)
1100                                 g_byte_array_free(data, TRUE);
1101                         return TRUE;
1102                 }
1103
1104                 /*
1105                  * If only data from the first pod is involved in the
1106                  * acquisition, then the raw input bytes can get passed
1107                  * forward for performance reasons. When the second pod
1108                  * is involved (either alone, or in combination with the
1109                  * first pod), then the received bytes need to be put
1110                  * into memory in such a layout that all channel groups
1111                  * get combined, and a unitsize larger than a single byte
1112                  * applies. The "queue" logic transparently copes with
1113                  * any such configuration. This works around the lack
1114                  * of support for "meaning" to logic data, which is used
1115                  * above for analog data.
1116                  */
1117                 if (devc->pod_count == 1) {
1118                         packet.type = SR_DF_LOGIC;
1119                         logic.data = data->data;
1120                         logic.length = data->len;
1121                         /* Truncate acquisition if a smaller number of samples has been requested. */
1122                         if (devc->samples_limit > 0 && logic.length > devc->samples_limit)
1123                                 logic.length = devc->samples_limit;
1124                         logic.unitsize = 1;
1125                         packet.payload = &logic;
1126                         sr_session_send(sdi, &packet);
1127                 } else {
1128                         group = ch->index / 8;
1129                         hmo_queue_logic_data(devc, group, data);
1130                 }
1131
1132                 devc->num_samples = data->len / devc->pod_count;
1133                 g_byte_array_free(data, TRUE);
1134                 data = NULL;
1135                 break;
1136         default:
1137                 sr_err("Invalid channel type.");
1138                 break;
1139         }
1140
1141         /*
1142          * Advance to the next enabled channel. When data for all enabled
1143          * channels was received, then flush potentially queued logic data,
1144          * and send the "frame end" packet.
1145          */
1146         if (devc->current_channel->next) {
1147                 devc->current_channel = devc->current_channel->next;
1148                 hmo_request_data(sdi);
1149                 return TRUE;
1150         }
1151         hmo_send_logic_packet(sdi, devc);
1152
1153         /*
1154          * Release the logic data storage after each frame. This copes
1155          * with sample counts that differ in length per frame. -- Is
1156          * this a real constraint when acquiring multiple frames with
1157          * identical device settings?
1158          */
1159         hmo_cleanup_logic_data(devc);
1160
1161         packet.type = SR_DF_FRAME_END;
1162         sr_session_send(sdi, &packet);
1163
1164         /*
1165          * End of frame was reached. Stop acquisition after the specified
1166          * number of frames or after the specified number of samples, or
1167          * continue reception by starting over at the first enabled channel.
1168          */
1169         if (++devc->num_frames >= devc->frame_limit || devc->num_samples >= devc->samples_limit) {
1170                 sr_dev_acquisition_stop(sdi);
1171                 hmo_cleanup_logic_data(devc);
1172         } else {
1173                 devc->current_channel = devc->enabled_channels;
1174                 hmo_request_data(sdi);
1175         }
1176
1177         return TRUE;
1178 }