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  *
   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 hmo_queue_logic_data(struct dev_context *devc,
  27                                   size_t group, GByteArray *pod_data);
  28 SR_PRIV void hmo_send_logic_packet(struct sr_dev_inst *sdi,
  29                                    struct dev_context *devc);
  30 SR_PRIV void hmo_cleanup_logic_data(struct dev_context *devc);
  31
  32 static const char *hameg_scpi_dialect[] = {
  33         [SCPI_CMD_GET_DIG_DATA]             = ":FORM UINT,8;:POD%d:DATA?",
  34         [SCPI_CMD_GET_TIMEBASE]             = ":TIM:SCAL?",
  35         [SCPI_CMD_SET_TIMEBASE]             = ":TIM:SCAL %s",
  36         [SCPI_CMD_GET_COUPLING]             = ":CHAN%d:COUP?",
  37         [SCPI_CMD_SET_COUPLING]             = ":CHAN%d:COUP %s",
  38         [SCPI_CMD_GET_SAMPLE_RATE]          = ":ACQ:SRAT?",
  39         [SCPI_CMD_GET_SAMPLE_RATE_LIVE]     = ":%s:DATA:POINTS?",
  40         [SCPI_CMD_GET_ANALOG_DATA]          = ":FORM:BORD %s;" \
  41                                               ":FORM REAL,32;:CHAN%d:DATA?",
  42         [SCPI_CMD_GET_VERTICAL_DIV]         = ":CHAN%d:SCAL?",
  43         [SCPI_CMD_SET_VERTICAL_DIV]         = ":CHAN%d:SCAL %s",
  44         [SCPI_CMD_GET_DIG_POD_STATE]        = ":POD%d:STAT?",
  45         [SCPI_CMD_SET_DIG_POD_STATE]        = ":POD%d:STAT %d",
  46         [SCPI_CMD_GET_TRIGGER_SLOPE]        = ":TRIG:A:EDGE:SLOP?",
  47         [SCPI_CMD_SET_TRIGGER_SLOPE]        = ":TRIG:A:EDGE:SLOP %s",
  48         [SCPI_CMD_GET_TRIGGER_SOURCE]       = ":TRIG:A:SOUR?",
  49         [SCPI_CMD_SET_TRIGGER_SOURCE]       = ":TRIG:A:SOUR %s",
  50         [SCPI_CMD_GET_DIG_CHAN_STATE]       = ":LOG%d:STAT?",
  51         [SCPI_CMD_SET_DIG_CHAN_STATE]       = ":LOG%d:STAT %d",
  52         [SCPI_CMD_GET_VERTICAL_OFFSET]      = ":CHAN%d:POS?",
  53         [SCPI_CMD_GET_HORIZ_TRIGGERPOS]     = ":TIM:POS?",
  54         [SCPI_CMD_SET_HORIZ_TRIGGERPOS]     = ":TIM:POS %s",
  55         [SCPI_CMD_GET_ANALOG_CHAN_STATE]    = ":CHAN%d:STAT?",
  56         [SCPI_CMD_SET_ANALOG_CHAN_STATE]    = ":CHAN%d:STAT %d",
  57         [SCPI_CMD_GET_PROBE_UNIT]           = ":PROB%d:SET:ATT:UNIT?",
  58 };
  59
  60 static const uint32_t devopts[] = {
  61         SR_CONF_OSCILLOSCOPE,
  62         SR_CONF_LIMIT_FRAMES | SR_CONF_GET | SR_CONF_SET,
  63         SR_CONF_SAMPLERATE | SR_CONF_GET,
  64         SR_CONF_TIMEBASE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  65         SR_CONF_NUM_HDIV | SR_CONF_GET,
  66         SR_CONF_HORIZ_TRIGGERPOS | SR_CONF_GET | SR_CONF_SET,
  67         SR_CONF_TRIGGER_SOURCE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  68         SR_CONF_TRIGGER_SLOPE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  69 };
  70
  71 static const uint32_t devopts_cg_analog[] = {
  72         SR_CONF_NUM_VDIV | SR_CONF_GET,
  73         SR_CONF_VDIV | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  74         SR_CONF_COUPLING | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  75 };
  76
  77 static const char *coupling_options[] = {
  78         "AC",  // AC with 50 Ohm termination (152x, 202x, 30xx, 1202)
  79         "ACL", // AC with 1 MOhm termination
  80         "DC",  // DC with 50 Ohm termination
  81         "DCL", // DC with 1 MOhm termination
  82         "GND",
  83 };
  84
  85 static const char *scope_trigger_slopes[] = {
  86         "POS",
  87         "NEG",
  88         "EITH",
  89 };
  90
  91 static const char *compact2_trigger_sources[] = {
  92         "CH1", "CH2",
  93         "LINE", "EXT", "PATT", "BUS1", "BUS2",
  94         "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",
  95 };
  96
  97 static const char *compact4_trigger_sources[] = {
  98         "CH1", "CH2", "CH3", "CH4",
  99         "LINE", "EXT", "PATT", "BUS1", "BUS2",
 100         "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",
 101 };
 102
 103 static const char *compact4_dig16_trigger_sources[] = {
 104         "CH1", "CH2", "CH3", "CH4",
 105         "LINE", "EXT", "PATT", "BUS1", "BUS2",
 106         "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",
 107         "D8", "D9", "D10", "D11", "D12", "D13", "D14", "D15",
 108 };
 109
 110 static const uint64_t timebases[][2] = {
 111         /* nanoseconds */
 112         { 2, 1000000000 },
 113         { 5, 1000000000 },
 114         { 10, 1000000000 },
 115         { 20, 1000000000 },
 116         { 50, 1000000000 },
 117         { 100, 1000000000 },
 118         { 200, 1000000000 },
 119         { 500, 1000000000 },
 120         /* microseconds */
 121         { 1, 1000000 },
 122         { 2, 1000000 },
 123         { 5, 1000000 },
 124         { 10, 1000000 },
 125         { 20, 1000000 },
 126         { 50, 1000000 },
 127         { 100, 1000000 },
 128         { 200, 1000000 },
 129         { 500, 1000000 },
 130         /* milliseconds */
 131         { 1, 1000 },
 132         { 2, 1000 },
 133         { 5, 1000 },
 134         { 10, 1000 },
 135         { 20, 1000 },
 136         { 50, 1000 },
 137         { 100, 1000 },
 138         { 200, 1000 },
 139         { 500, 1000 },
 140         /* seconds */
 141         { 1, 1 },
 142         { 2, 1 },
 143         { 5, 1 },
 144         { 10, 1 },
 145         { 20, 1 },
 146         { 50, 1 },
 147 };
 148
 149 static const uint64_t vdivs[][2] = {
 150         /* millivolts */
 151         { 1, 1000 },
 152         { 2, 1000 },
 153         { 5, 1000 },
 154         { 10, 1000 },
 155         { 20, 1000 },
 156         { 50, 1000 },
 157         { 100, 1000 },
 158         { 200, 1000 },
 159         { 500, 1000 },
 160         /* volts */
 161         { 1, 1 },
 162         { 2, 1 },
 163         { 5, 1 },
 164         { 10, 1 },
 165         { 20, 1 },
 166         { 50, 1 },
 167 };
 168
 169 static const char *scope_analog_channel_names[] = {
 170         "CH1", "CH2", "CH3", "CH4",
 171 };
 172
 173 static const char *scope_digital_channel_names[] = {
 174         "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",
 175         "D8", "D9", "D10", "D11", "D12", "D13", "D14", "D15",
 176 };
 177
 178 static const struct scope_config scope_models[] = {
 179         {
 180                 /* HMO2522/3032/3042/3052 support 16 digital channels but they're not supported yet. */
 181                 .name = {"HMO1002", "HMO722", "HMO1022", "HMO1522", "HMO2022", "HMO2522",
 182                                 "HMO3032", "HMO3042", "HMO3052", NULL},
 183                 .analog_channels = 2,
 184                 .digital_channels = 8,
 185                 .digital_pods = 1,
 186
 187                 .analog_names = &scope_analog_channel_names,
 188                 .digital_names = &scope_digital_channel_names,
 189
 190                 .devopts = &devopts,
 191                 .num_devopts = ARRAY_SIZE(devopts),
 192
 193                 .devopts_cg_analog = &devopts_cg_analog,
 194                 .num_devopts_cg_analog = ARRAY_SIZE(devopts_cg_analog),
 195
 196                 .coupling_options = &coupling_options,
 197                 .num_coupling_options = ARRAY_SIZE(coupling_options),
 198
 199                 .trigger_sources = &compact2_trigger_sources,
 200                 .num_trigger_sources = ARRAY_SIZE(compact2_trigger_sources),
 201
 202                 .trigger_slopes = &scope_trigger_slopes,
 203                 .num_trigger_slopes = ARRAY_SIZE(scope_trigger_slopes),
 204
 205                 .timebases = &timebases,
 206                 .num_timebases = ARRAY_SIZE(timebases),
 207
 208                 .vdivs = &vdivs,
 209                 .num_vdivs = ARRAY_SIZE(vdivs),
 210
 211                 .num_xdivs = 12,
 212                 .num_ydivs = 8,
 213
 214                 .scpi_dialect = &hameg_scpi_dialect,
 215         },
 216         {
 217                 .name = {"HMO724", "HMO1024", "HMO1524", "HMO2024", NULL},
 218                 .analog_channels = 4,
 219                 .digital_channels = 8,
 220                 .digital_pods = 1,
 221
 222                 .analog_names = &scope_analog_channel_names,
 223                 .digital_names = &scope_digital_channel_names,
 224
 225                 .devopts = &devopts,
 226                 .num_devopts = ARRAY_SIZE(devopts),
 227
 228                 .devopts_cg_analog = &devopts_cg_analog,
 229                 .num_devopts_cg_analog = ARRAY_SIZE(devopts_cg_analog),
 230
 231                 .coupling_options = &coupling_options,
 232                 .num_coupling_options = ARRAY_SIZE(coupling_options),
 233
 234                 .trigger_sources = &compact4_trigger_sources,
 235                 .num_trigger_sources = ARRAY_SIZE(compact4_trigger_sources),
 236
 237                 .trigger_slopes = &scope_trigger_slopes,
 238                 .num_trigger_slopes = ARRAY_SIZE(scope_trigger_slopes),
 239
 240                 .timebases = &timebases,
 241                 .num_timebases = ARRAY_SIZE(timebases),
 242
 243                 .vdivs = &vdivs,
 244                 .num_vdivs = ARRAY_SIZE(vdivs),
 245
 246                 .num_xdivs = 12,
 247                 .num_ydivs = 8,
 248
 249                 .scpi_dialect = &hameg_scpi_dialect,
 250         },
 251         {
 252                 .name = {"HMO2524", "HMO3034", "HMO3044", "HMO3054", "HMO3524", NULL},
 253                 .analog_channels = 4,
 254                 .digital_channels = 16,
 255                 .digital_pods = 2,
 256
 257                 .analog_names = &scope_analog_channel_names,
 258                 .digital_names = &scope_digital_channel_names,
 259
 260                 .devopts = &devopts,
 261                 .num_devopts = ARRAY_SIZE(devopts),
 262
 263                 .devopts_cg_analog = &devopts_cg_analog,
 264                 .num_devopts_cg_analog = ARRAY_SIZE(devopts_cg_analog),
 265
 266                 .coupling_options = &coupling_options,
 267                 .num_coupling_options = ARRAY_SIZE(coupling_options),
 268
 269                 .trigger_sources = &compact4_dig16_trigger_sources,
 270                 .num_trigger_sources = ARRAY_SIZE(compact4_dig16_trigger_sources),
 271
 272                 .trigger_slopes = &scope_trigger_slopes,
 273                 .num_trigger_slopes = ARRAY_SIZE(scope_trigger_slopes),
 274
 275                 .timebases = &timebases,
 276                 .num_timebases = ARRAY_SIZE(timebases),
 277
 278                 .vdivs = &vdivs,
 279                 .num_vdivs = ARRAY_SIZE(vdivs),
 280
 281                 .num_xdivs = 12,
 282                 .num_ydivs = 8,
 283
 284                 .scpi_dialect = &hameg_scpi_dialect,
 285         },
 286 };
 287
 288 static void scope_state_dump(const struct scope_config *config,
 289                              struct scope_state *state)
 290 {
 291         unsigned int i;
 292         char *tmp;
 293
 294         for (i = 0; i < config->analog_channels; i++) {
 295                 tmp = sr_voltage_string((*config->vdivs)[state->analog_channels[i].vdiv][0],
 296                                              (*config->vdivs)[state->analog_channels[i].vdiv][1]);
 297                 sr_info("State of analog channel %d -> %s : %s (coupling) %s (vdiv) %2.2e (offset)",
 298                         i + 1, state->analog_channels[i].state ? "On" : "Off",
 299                         (*config->coupling_options)[state->analog_channels[i].coupling],
 300                         tmp, state->analog_channels[i].vertical_offset);
 301         }
 302
 303         for (i = 0; i < config->digital_channels; i++) {
 304                 sr_info("State of digital channel %d -> %s", i,
 305                         state->digital_channels[i] ? "On" : "Off");
 306         }
 307
 308         for (i = 0; i < config->digital_pods; i++) {
 309                 sr_info("State of digital POD %d -> %s", i,
 310                         state->digital_pods[i] ? "On" : "Off");
 311         }
 312
 313         tmp = sr_period_string((*config->timebases)[state->timebase][0],
 314                                (*config->timebases)[state->timebase][1]);
 315         sr_info("Current timebase: %s", tmp);
 316         g_free(tmp);
 317
 318         tmp = sr_samplerate_string(state->sample_rate);
 319         sr_info("Current samplerate: %s", tmp);
 320         g_free(tmp);
 321
 322         sr_info("Current trigger: %s (source), %s (slope) %.2f (offset)",
 323                 (*config->trigger_sources)[state->trigger_source],
 324                 (*config->trigger_slopes)[state->trigger_slope],
 325                 state->horiz_triggerpos);
 326 }
 327
 328 static int scope_state_get_array_option(struct sr_scpi_dev_inst *scpi,
 329                 const char *command, const char *(*array)[], unsigned int n, int *result)
 330 {
 331         char *tmp;
 332         int idx;
 333
 334         if (sr_scpi_get_string(scpi, command, &tmp) != SR_OK) {
 335                 g_free(tmp);
 336                 return SR_ERR;
 337         }
 338
 339         if ((idx = std_str_idx_s(tmp, *array, n)) < 0) {
 340                 g_free(tmp);
 341                 return SR_ERR_ARG;
 342         }
 343
 344         *result = idx;
 345
 346         g_free(tmp);
 347
 348         return SR_OK;
 349 }
 350
 351 /**
 352  * This function takes a value of the form "2.000E-03" and returns the index
 353  * of an array where a matching pair was found.
 354  *
 355  * @param value The string to be parsed.
 356  * @param array The array of s/f pairs.
 357  * @param array_len The number of pairs in the array.
 358  * @param result The index at which a matching pair was found.
 359  *
 360  * @return SR_ERR on any parsing error, SR_OK otherwise.
 361  */
 362 static int array_float_get(gchar *value, const uint64_t array[][2],
 363                 int array_len, unsigned int *result)
 364 {
 365         struct sr_rational rval;
 366         struct sr_rational aval;
 367
 368         if (sr_parse_rational(value, &rval) != SR_OK)
 369                 return SR_ERR;
 370
 371         for (int i = 0; i < array_len; i++) {
 372                 sr_rational_set(&aval, array[i][0], array[i][1]);
 373                 if (sr_rational_eq(&rval, &aval)) {
 374                         *result = i;
 375                         return SR_OK;
 376                 }
 377         }
 378
 379         return SR_ERR;
 380 }
 381
 382 static int analog_channel_state_get(struct sr_scpi_dev_inst *scpi,
 383                                     const struct scope_config *config,
 384                                     struct scope_state *state)
 385 {
 386         unsigned int i, j;
 387         char command[MAX_COMMAND_SIZE];
 388         char *tmp_str;
 389
 390         for (i = 0; i < config->analog_channels; i++) {
 391                 g_snprintf(command, sizeof(command),
 392                            (*config->scpi_dialect)[SCPI_CMD_GET_ANALOG_CHAN_STATE],
 393                            i + 1);
 394
 395                 if (sr_scpi_get_bool(scpi, command,
 396                                      &state->analog_channels[i].state) != SR_OK)
 397                         return SR_ERR;
 398
 399                 g_snprintf(command, sizeof(command),
 400                            (*config->scpi_dialect)[SCPI_CMD_GET_VERTICAL_DIV],
 401                            i + 1);
 402
 403                 if (sr_scpi_get_string(scpi, command, &tmp_str) != SR_OK)
 404                         return SR_ERR;
 405
 406                 if (array_float_get(tmp_str, ARRAY_AND_SIZE(vdivs), &j) != SR_OK) {
 407                         g_free(tmp_str);
 408                         sr_err("Could not determine array index for vertical div scale.");
 409                         return SR_ERR;
 410                 }
 411
 412                 g_free(tmp_str);
 413                 state->analog_channels[i].vdiv = j;
 414
 415                 g_snprintf(command, sizeof(command),
 416                            (*config->scpi_dialect)[SCPI_CMD_GET_VERTICAL_OFFSET],
 417                            i + 1);
 418
 419                 if (sr_scpi_get_float(scpi, command,
 420                                      &state->analog_channels[i].vertical_offset) != SR_OK)
 421                         return SR_ERR;
 422
 423                 g_snprintf(command, sizeof(command),
 424                            (*config->scpi_dialect)[SCPI_CMD_GET_COUPLING],
 425                            i + 1);
 426
 427                 if (scope_state_get_array_option(scpi, command, config->coupling_options,
 428                                          config->num_coupling_options,
 429                                          &state->analog_channels[i].coupling) != SR_OK)
 430                         return SR_ERR;
 431
 432                 g_snprintf(command, sizeof(command),
 433                            (*config->scpi_dialect)[SCPI_CMD_GET_PROBE_UNIT],
 434                            i + 1);
 435
 436                 if (sr_scpi_get_string(scpi, command, &tmp_str) != SR_OK)
 437                         return SR_ERR;
 438
 439                 if (tmp_str[0] == 'A')
 440                         state->analog_channels[i].probe_unit = 'A';
 441                 else
 442                         state->analog_channels[i].probe_unit = 'V';
 443                 g_free(tmp_str);
 444         }
 445
 446         return SR_OK;
 447 }
 448
 449 static int digital_channel_state_get(struct sr_scpi_dev_inst *scpi,
 450                                      const struct scope_config *config,
 451                                      struct scope_state *state)
 452 {
 453         unsigned int i;
 454         char command[MAX_COMMAND_SIZE];
 455
 456         for (i = 0; i < config->digital_channels; i++) {
 457                 g_snprintf(command, sizeof(command),
 458                            (*config->scpi_dialect)[SCPI_CMD_GET_DIG_CHAN_STATE],
 459                            i);
 460
 461                 if (sr_scpi_get_bool(scpi, command,
 462                                      &state->digital_channels[i]) != SR_OK)
 463                         return SR_ERR;
 464         }
 465
 466         for (i = 0; i < config->digital_pods; i++) {
 467                 g_snprintf(command, sizeof(command),
 468                            (*config->scpi_dialect)[SCPI_CMD_GET_DIG_POD_STATE],
 469                            i + 1);
 470
 471                 if (sr_scpi_get_bool(scpi, command,
 472                                      &state->digital_pods[i]) != SR_OK)
 473                         return SR_ERR;
 474         }
 475
 476         return SR_OK;
 477 }
 478
 479 SR_PRIV int hmo_update_sample_rate(const struct sr_dev_inst *sdi)
 480 {
 481         struct dev_context *devc;
 482         struct scope_state *state;
 483         const struct scope_config *config;
 484         int tmp;
 485         unsigned int i;
 486         float tmp_float;
 487         gboolean channel_found;
 488         char tmp_str[MAX_COMMAND_SIZE];
 489         char chan_name[20];
 490
 491         devc = sdi->priv;
 492         config = devc->model_config;
 493         state = devc->model_state;
 494         channel_found = FALSE;
 495
 496         for (i = 0; i < config->analog_channels; i++) {
 497                 if (!state->analog_channels[i].state)
 498                         continue;
 499                 g_snprintf(chan_name, sizeof(chan_name), "CHAN%d", i + 1);
 500                 g_snprintf(tmp_str, sizeof(tmp_str),
 501                            (*config->scpi_dialect)[SCPI_CMD_GET_SAMPLE_RATE_LIVE],
 502                            chan_name);
 503                 channel_found = TRUE;
 504                 break;
 505         }
 506
 507         if (!channel_found) {
 508                 for (i = 0; i < config->digital_pods; i++) {
 509                         if (!state->digital_pods[i])
 510                                 continue;
 511                         g_snprintf(chan_name, sizeof(chan_name), "POD%d", i);
 512                         g_snprintf(tmp_str, sizeof(tmp_str),
 513                                    (*config->scpi_dialect)[SCPI_CMD_GET_SAMPLE_RATE_LIVE],
 514                                    chan_name);
 515                         channel_found = TRUE;
 516                         break;
 517                 }
 518         }
 519
 520         /* No channel is active, ask the instrument for the sample rate
 521          * in single shot mode */
 522         if (!channel_found) {
 523                 if (sr_scpi_get_float(sdi->conn,
 524                                       (*config->scpi_dialect)[SCPI_CMD_GET_SAMPLE_RATE],
 525                                       &tmp_float) != SR_OK)
 526                         return SR_ERR;
 527
 528                 state->sample_rate = tmp_float;
 529         } else {
 530                 if (sr_scpi_get_int(sdi->conn, tmp_str, &tmp) != SR_OK)
 531                         return SR_ERR;
 532                 state->sample_rate = tmp / (((float) (*config->timebases)[state->timebase][0] /
 533                                              (*config->timebases)[state->timebase][1]) *
 534                                             config->num_xdivs);
 535         }
 536
 537         return SR_OK;
 538 }
 539
 540 SR_PRIV int hmo_scope_state_get(struct sr_dev_inst *sdi)
 541 {
 542         struct dev_context *devc;
 543         struct scope_state *state;
 544         const struct scope_config *config;
 545         float tmp_float;
 546         unsigned int i;
 547         char *tmp_str;
 548
 549         devc = sdi->priv;
 550         config = devc->model_config;
 551         state = devc->model_state;
 552
 553         sr_info("Fetching scope state");
 554
 555         if (analog_channel_state_get(sdi->conn, config, state) != SR_OK)
 556                 return SR_ERR;
 557
 558         if (digital_channel_state_get(sdi->conn, config, state) != SR_OK)
 559                 return SR_ERR;
 560
 561         if (sr_scpi_get_float(sdi->conn,
 562                         (*config->scpi_dialect)[SCPI_CMD_GET_TIMEBASE],
 563                         &tmp_float) != SR_OK)
 564                 return SR_ERR;
 565
 566         if (sr_scpi_get_string(sdi->conn,
 567                         (*config->scpi_dialect)[SCPI_CMD_GET_TIMEBASE],
 568                         &tmp_str) != SR_OK)
 569                 return SR_ERR;
 570
 571         if (array_float_get(tmp_str, ARRAY_AND_SIZE(timebases), &i) != SR_OK) {
 572                 g_free(tmp_str);
 573                 sr_err("Could not determine array index for time base.");
 574                 return SR_ERR;
 575         }
 576         g_free(tmp_str);
 577
 578         state->timebase = i;
 579
 580         if (sr_scpi_get_float(sdi->conn,
 581                         (*config->scpi_dialect)[SCPI_CMD_GET_HORIZ_TRIGGERPOS],
 582                         &tmp_float) != SR_OK)
 583                 return SR_ERR;
 584         state->horiz_triggerpos = tmp_float /
 585                 (((double) (*config->timebases)[state->timebase][0] /
 586                   (*config->timebases)[state->timebase][1]) * config->num_xdivs);
 587         state->horiz_triggerpos -= 0.5;
 588         state->horiz_triggerpos *= -1;
 589
 590         if (scope_state_get_array_option(sdi->conn,
 591                         (*config->scpi_dialect)[SCPI_CMD_GET_TRIGGER_SOURCE],
 592                         config->trigger_sources, config->num_trigger_sources,
 593                         &state->trigger_source) != SR_OK)
 594                 return SR_ERR;
 595
 596         if (scope_state_get_array_option(sdi->conn,
 597                         (*config->scpi_dialect)[SCPI_CMD_GET_TRIGGER_SLOPE],
 598                         config->trigger_slopes, config->num_trigger_slopes,
 599                         &state->trigger_slope) != SR_OK)
 600                 return SR_ERR;
 601
 602         if (hmo_update_sample_rate(sdi) != SR_OK)
 603                 return SR_ERR;
 604
 605         sr_info("Fetching finished.");
 606
 607         scope_state_dump(config, state);
 608
 609         return SR_OK;
 610 }
 611
 612 static struct scope_state *scope_state_new(const struct scope_config *config)
 613 {
 614         struct scope_state *state;
 615
 616         state = g_malloc0(sizeof(struct scope_state));
 617         state->analog_channels = g_malloc0_n(config->analog_channels,
 618                         sizeof(struct analog_channel_state));
 619         state->digital_channels = g_malloc0_n(
 620                         config->digital_channels, sizeof(gboolean));
 621         state->digital_pods = g_malloc0_n(config->digital_pods,
 622                         sizeof(gboolean));
 623
 624         return state;
 625 }
 626
 627 SR_PRIV void hmo_scope_state_free(struct scope_state *state)
 628 {
 629         g_free(state->analog_channels);
 630         g_free(state->digital_channels);
 631         g_free(state->digital_pods);
 632         g_free(state);
 633 }
 634
 635 SR_PRIV int hmo_init_device(struct sr_dev_inst *sdi)
 636 {
 637         int model_index;
 638         unsigned int i, j, group;
 639         struct sr_channel *ch;
 640         struct dev_context *devc;
 641
 642         devc = sdi->priv;
 643         model_index = -1;
 644
 645         /* Find the exact model. */
 646         for (i = 0; i < ARRAY_SIZE(scope_models); i++) {
 647                 for (j = 0; scope_models[i].name[j]; j++) {
 648                         if (!strcmp(sdi->model, scope_models[i].name[j])) {
 649                                 model_index = i;
 650                                 break;
 651                         }
 652                 }
 653                 if (model_index != -1)
 654                         break;
 655         }
 656
 657         if (model_index == -1) {
 658                 sr_dbg("Unsupported HMO device.");
 659                 return SR_ERR_NA;
 660         }
 661
 662         devc->analog_groups = g_malloc0(sizeof(struct sr_channel_group*) *
 663                                         scope_models[model_index].analog_channels);
 664
 665         devc->digital_groups = g_malloc0(sizeof(struct sr_channel_group*) *
 666                                          scope_models[model_index].digital_pods);
 667
 668         /* Add analog channels. */
 669         for (i = 0; i < scope_models[model_index].analog_channels; i++) {
 670                 ch = sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE,
 671                            (*scope_models[model_index].analog_names)[i]);
 672
 673                 devc->analog_groups[i] = g_malloc0(sizeof(struct sr_channel_group));
 674
 675                 devc->analog_groups[i]->name = g_strdup(
 676                         (char *)(*scope_models[model_index].analog_names)[i]);
 677                 devc->analog_groups[i]->channels = g_slist_append(NULL, ch);
 678
 679                 sdi->channel_groups = g_slist_append(sdi->channel_groups,
 680                                                    devc->analog_groups[i]);
 681         }
 682
 683         /* Add digital channel groups. */
 684         for (i = 0; i < scope_models[model_index].digital_pods; i++) {
 685                 devc->digital_groups[i] = g_malloc0(sizeof(struct sr_channel_group));
 686                 devc->digital_groups[i]->name = g_strdup_printf("POD%d", i);
 687                 sdi->channel_groups = g_slist_append(sdi->channel_groups,
 688                                    devc->digital_groups[i]);
 689         }
 690
 691         /* Add digital channels. */
 692         for (i = 0; i < scope_models[model_index].digital_channels; i++) {
 693                 ch = sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE,
 694                            (*scope_models[model_index].digital_names)[i]);
 695
 696                 group = i / 8;
 697                 devc->digital_groups[group]->channels = g_slist_append(
 698                         devc->digital_groups[group]->channels, ch);
 699         }
 700
 701         devc->model_config = &scope_models[model_index];
 702         devc->frame_limit = 0;
 703
 704         if (!(devc->model_state = scope_state_new(devc->model_config)))
 705                 return SR_ERR_MALLOC;
 706
 707         return SR_OK;
 708 }
 709
 710 /* Queue data of one channel group, for later submission. */
 711 SR_PRIV void hmo_queue_logic_data(struct dev_context *devc,
 712                                   size_t group, GByteArray *pod_data)
 713 {
 714         size_t size;
 715         GByteArray *store;
 716         uint8_t *logic_data;
 717         size_t idx, logic_step;
 718
 719         /*
 720          * Upon first invocation, allocate the array which can hold the
 721          * combined logic data for all channels. Assume that each channel
 722          * will yield an identical number of samples per receive call.
 723          *
 724          * As a poor man's safety measure: (Silently) skip processing
 725          * for unexpected sample counts, and ignore samples for
 726          * unexpected channel groups. Don't bother with complicated
 727          * resize logic, considering that many models only support one
 728          * pod, and the most capable supported models have two pods of
 729          * identical size. We haven't yet seen any "odd" configuration.
 730          */
 731         if (!devc->logic_data) {
 732                 size = pod_data->len * devc->pod_count;
 733                 store = g_byte_array_sized_new(size);
 734                 memset(store->data, 0, size);
 735                 store = g_byte_array_set_size(store, size);
 736                 devc->logic_data = store;
 737         } else {
 738                 store = devc->logic_data;
 739                 size = store->len / devc->pod_count;
 740                 if (size != pod_data->len)
 741                         return;
 742                 if (group >= devc->pod_count)
 743                         return;
 744         }
 745
 746         /*
 747          * Fold the data of the most recently received channel group into
 748          * the storage, where data resides for all channels combined.
 749          */
 750         logic_data = store->data;
 751         logic_data += group;
 752         logic_step = devc->pod_count;
 753         for (idx = 0; idx < pod_data->len; idx++) {
 754                 *logic_data = pod_data->data[idx];
 755                 logic_data += logic_step;
 756         }
 757 }
 758
 759 /* Submit data for all channels, after the individual groups got collected. */
 760 SR_PRIV void hmo_send_logic_packet(struct sr_dev_inst *sdi,
 761                                    struct dev_context *devc)
 762 {
 763         struct sr_datafeed_packet packet;
 764         struct sr_datafeed_logic logic;
 765
 766         if (!devc->logic_data)
 767                 return;
 768
 769         logic.data = devc->logic_data->data;
 770         logic.length = devc->logic_data->len;
 771         logic.unitsize = devc->pod_count;
 772
 773         packet.type = SR_DF_LOGIC;
 774         packet.payload = &logic;
 775
 776         sr_session_send(sdi, &packet);
 777 }
 778
 779 /* Undo previous resource allocation. */
 780 SR_PRIV void hmo_cleanup_logic_data(struct dev_context *devc)
 781 {
 782
 783         if (devc->logic_data) {
 784                 g_byte_array_free(devc->logic_data, TRUE);
 785                 devc->logic_data = NULL;
 786         }
 787         /*
 788          * Keep 'pod_count'! It's required when more frames will be
 789          * received, and does not harm when kept after acquisition.
 790          */
 791 }
 792
 793 SR_PRIV int hmo_receive_data(int fd, int revents, void *cb_data)
 794 {
 795         struct sr_channel *ch;
 796         struct sr_dev_inst *sdi;
 797         struct dev_context *devc;
 798         struct scope_state *state;
 799         struct sr_datafeed_packet packet;
 800         GByteArray *data;
 801         struct sr_datafeed_analog analog;
 802         struct sr_analog_encoding encoding;
 803         struct sr_analog_meaning meaning;
 804         struct sr_analog_spec spec;
 805         struct sr_datafeed_logic logic;
 806         size_t group;
 807
 808         (void)fd;
 809         (void)revents;
 810
 811         data = NULL;
 812
 813         if (!(sdi = cb_data))
 814                 return TRUE;
 815
 816         if (!(devc = sdi->priv))
 817                 return TRUE;
 818
 819         /* Although this is correct in general, the USBTMC libusb implementation
 820          * currently does not generate an event prior to the first read. Often
 821          * it is ok to start reading just after the 50ms timeout. See bug #785.
 822         if (revents != G_IO_IN)
 823                 return TRUE;
 824         */
 825
 826         ch = devc->current_channel->data;
 827         state = devc->model_state;
 828
 829         /*
 830          * Send "frame begin" packet upon reception of data for the
 831          * first enabled channel.
 832          */
 833         if (devc->current_channel == devc->enabled_channels) {
 834                 packet.type = SR_DF_FRAME_BEGIN;
 835                 sr_session_send(sdi, &packet);
 836         }
 837
 838         /*
 839          * Pass on the received data of the channel(s).
 840          */
 841         switch (ch->type) {
 842         case SR_CHANNEL_ANALOG:
 843                 if (sr_scpi_get_block(sdi->conn, NULL, &data) != SR_OK) {
 844                         if (data)
 845                                 g_byte_array_free(data, TRUE);
 846
 847                         return TRUE;
 848                 }
 849
 850                 packet.type = SR_DF_ANALOG;
 851
 852                 analog.data = data->data;
 853                 analog.num_samples = data->len / sizeof(float);
 854                 analog.encoding = &encoding;
 855                 analog.meaning = &meaning;
 856                 analog.spec = &spec;
 857
 858                 encoding.unitsize = sizeof(float);
 859                 encoding.is_signed = TRUE;
 860                 encoding.is_float = TRUE;
 861 #ifdef WORDS_BIGENDIAN
 862                 encoding.is_bigendian = TRUE;
 863 #else
 864                 encoding.is_bigendian = FALSE;
 865 #endif
 866                 /* TODO: Use proper 'digits' value for this device (and its modes). */
 867                 encoding.digits = 2;
 868                 encoding.is_digits_decimal = FALSE;
 869                 encoding.scale.p = 1;
 870                 encoding.scale.q = 1;
 871                 encoding.offset.p = 0;
 872                 encoding.offset.q = 1;
 873                 if (state->analog_channels[ch->index].probe_unit == 'V') {
 874                         meaning.mq = SR_MQ_VOLTAGE;
 875                         meaning.unit = SR_UNIT_VOLT;
 876                 } else {
 877                         meaning.mq = SR_MQ_CURRENT;
 878                         meaning.unit = SR_UNIT_AMPERE;
 879                 }
 880                 meaning.mqflags = 0;
 881                 meaning.channels = g_slist_append(NULL, ch);
 882                 /* TODO: Use proper 'digits' value for this device (and its modes). */
 883                 spec.spec_digits = 2;
 884                 packet.payload = &analog;
 885                 sr_session_send(sdi, &packet);
 886                 g_slist_free(meaning.channels);
 887                 g_byte_array_free(data, TRUE);
 888                 data = NULL;
 889                 break;
 890         case SR_CHANNEL_LOGIC:
 891                 if (sr_scpi_get_block(sdi->conn, NULL, &data) != SR_OK) {
 892                         g_free(data);
 893                         return TRUE;
 894                 }
 895
 896                 /*
 897                  * If only data from the first pod is involved in the
 898                  * acquisition, then the raw input bytes can get passed
 899                  * forward for performance reasons. When the second pod
 900                  * is involved (either alone, or in combination with the
 901                  * first pod), then the received bytes need to be put
 902                  * into memory in such a layout that all channel groups
 903                  * get combined, and a unitsize larger than a single byte
 904                  * applies. The "queue" logic transparently copes with
 905                  * any such configuration. This works around the lack
 906                  * of support for "meaning" to logic data, which is used
 907                  * above for analog data.
 908                  */
 909                 if (devc->pod_count == 1) {
 910                         packet.type = SR_DF_LOGIC;
 911                         logic.data = data->data;
 912                         logic.length = data->len;
 913                         logic.unitsize = 1;
 914                         packet.payload = &logic;
 915                         sr_session_send(sdi, &packet);
 916                 } else {
 917                         group = ch->index / 8;
 918                         hmo_queue_logic_data(devc, group, data);
 919                 }
 920
 921                 g_byte_array_free(data, TRUE);
 922                 data = NULL;
 923                 break;
 924         default:
 925                 sr_err("Invalid channel type.");
 926                 break;
 927         }
 928
 929         /*
 930          * Advance to the next enabled channel. When data for all enabled
 931          * channels was received, then flush potentially queued logic data,
 932          * and send the "frame end" packet.
 933          */
 934         if (devc->current_channel->next) {
 935                 devc->current_channel = devc->current_channel->next;
 936                 hmo_request_data(sdi);
 937                 return TRUE;
 938         }
 939         hmo_send_logic_packet(sdi, devc);
 940
 941         /*
 942          * Release the logic data storage after each frame. This copes
 943          * with sample counts that differ in length per frame. -- Is
 944          * this a real constraint when acquiring multiple frames with
 945          * identical device settings?
 946          */
 947         hmo_cleanup_logic_data(devc);
 948
 949         packet.type = SR_DF_FRAME_END;
 950         sr_session_send(sdi, &packet);
 951
 952         /*
 953          * End of frame was reached. Stop acquisition after the specified
 954          * number of frames, or continue reception by starting over at
 955          * the first enabled channel.
 956          */
 957         if (++devc->num_frames == devc->frame_limit) {
 958                 sr_dev_acquisition_stop(sdi);
 959                 hmo_cleanup_logic_data(devc);
 960         } else {
 961                 devc->current_channel = devc->enabled_channels;
 962                 hmo_request_data(sdi);
 963         }
 964
 965         return TRUE;
 966 }