src/hardware/siglent-sds/protocol.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2016 mhooijboer <marchelh@gmail.com>
   5  * Copyright (C) 2012 Martin Ling <martin-git@earth.li>
   6  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
   7  * Copyright (C) 2013 Mathias Grimmberger <mgri@zaphod.sax.de>
   8  *
   9  * This program is free software: you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation, either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #define _GNU_SOURCE
  24
  25 #include <config.h>
  26 #include <errno.h>
  27 #include <glib.h>
  28 #include <math.h>
  29 #include <stdlib.h>
  30 #include <stdarg.h>
  31 #include <string.h>
  32 #include <time.h>
  33 #include <unistd.h>
  34 #include <libsigrok/libsigrok.h>
  35 #include "libsigrok-internal.h"
  36 #include "scpi.h"
  37 #include "protocol.h"
  38
  39 /* Set the next event to wait for in siglent_sds_receive(). */
  40 static void siglent_sds_set_wait_event(struct dev_context *devc, enum wait_events event)
  41 {
  42         if (event == WAIT_STOP) {
  43                 devc->wait_status = 2;
  44         } else {
  45                 devc->wait_status = 1;
  46                 devc->wait_event = event;
  47         }
  48 }
  49
  50 /*
  51  * Waiting for a event will return a timeout after 2 to 3 seconds in order
  52  * to not block the application.
  53  */
  54 static int siglent_sds_event_wait(const struct sr_dev_inst *sdi)
  55 {
  56         char *buf;
  57         long s;
  58         int out;
  59         struct dev_context *devc;
  60         time_t start;
  61
  62         if (!(devc = sdi->priv))
  63                 return SR_ERR;
  64
  65         start = time(NULL);
  66
  67         s = 10000; /* Sleep time for status refresh. */
  68         if (devc->wait_status == 1) {
  69                 do {
  70                         if (time(NULL) - start >= 3) {
  71                                 sr_dbg("Timeout waiting for trigger.");
  72                                 return SR_ERR_TIMEOUT;
  73                         }
  74
  75                         if (sr_scpi_get_string(sdi->conn, ":INR?", &buf) != SR_OK)
  76                                 return SR_ERR;
  77                         sr_atoi(buf, &out);
  78                         g_usleep(s);
  79                 } while (out == 0);
  80
  81                 sr_dbg("Device triggered.");
  82
  83                 if ((devc->timebase < 0.51) && (devc->timebase > 0.99e-6)) {
  84                         /*
  85                          * Timebase * num hor. divs * 85(%) * 1e6(usecs) / 100
  86                          * -> 85 percent of sweep time
  87                          */
  88                         s = (devc->timebase * devc->model->series->num_horizontal_divs * 1000);
  89                         sr_spew("Sleeping for %ld usecs after trigger, "
  90                                 "to let the acq buffer in the device fill", s);
  91                         g_usleep(s);
  92                 }
  93         }
  94         if (devc->wait_status == 2) {
  95                 do {
  96                         if (time(NULL) - start >= 3) {
  97                                 sr_dbg("Timeout waiting for trigger.");
  98                                 return SR_ERR_TIMEOUT;
  99                         }
 100                         if (sr_scpi_get_string(sdi->conn, ":INR?", &buf) != SR_OK)
 101                                 return SR_ERR;
 102                         sr_atoi(buf, &out);
 103                         g_usleep(s);
 104                 /* XXX
 105                  * Now this loop condition looks suspicious! A bitwise
 106                  * OR of a variable and a non-zero literal should be
 107                  * non-zero. Logical AND of several non-zero values
 108                  * should be non-zero. Are many parts of the condition
 109                  * not taking effect? Was some different condition meant
 110                  * to get encoded? This needs review, and adjustment.
 111                  */
 112                 } while ((out | DEVICE_STATE_TRIG_RDY && out | DEVICE_STATE_DATA_ACQ) && out | DEVICE_STATE_STOPPED);
 113                 sr_dbg("Device triggerd 2.");
 114                 siglent_sds_set_wait_event(devc, WAIT_NONE);
 115         }
 116
 117         return SR_OK;
 118 }
 119
 120 static int siglent_sds_trigger_wait(const struct sr_dev_inst *sdi)
 121 {
 122         struct dev_context *devc;
 123
 124         if (!(devc = sdi->priv))
 125                 return SR_ERR;
 126         return siglent_sds_event_wait(sdi);
 127 }
 128
 129 /* Wait for scope to got to "Stop" in single shot mode. */
 130 static int siglent_sds_stop_wait(const struct sr_dev_inst *sdi)
 131 {
 132         return siglent_sds_event_wait(sdi);
 133 }
 134
 135 /* Send a configuration setting. */
 136 SR_PRIV int siglent_sds_config_set(const struct sr_dev_inst *sdi, const char *format, ...)
 137 {
 138         va_list args;
 139         int ret;
 140
 141         va_start(args, format);
 142         ret = sr_scpi_send_variadic(sdi->conn, format, args);
 143         va_end(args);
 144
 145         return ret;
 146 }
 147
 148 /* Start capturing a new frameset. */
 149 SR_PRIV int siglent_sds_capture_start(const struct sr_dev_inst *sdi)
 150 {
 151         struct dev_context *devc;
 152
 153         if (!(devc = sdi->priv))
 154                 return SR_ERR;
 155
 156         switch (devc->model->series->protocol) {
 157         case SPO_MODEL:
 158                 if (devc->data_source == DATA_SOURCE_SCREEN) {
 159                         char *buf;
 160                         int out;
 161
 162                         sr_dbg("Starting data capture for active frameset %" PRIu64 " of %" PRIu64,
 163                                 devc->num_frames + 1, devc->limit_frames);
 164                         if (siglent_sds_config_set(sdi, "ARM") != SR_OK)
 165                                 return SR_ERR;
 166                         if (sr_scpi_get_string(sdi->conn, ":INR?", &buf) != SR_OK)
 167                                 return SR_ERR;
 168                         sr_atoi(buf, &out);
 169                         if (out == DEVICE_STATE_TRIG_RDY) {
 170                                 siglent_sds_set_wait_event(devc, WAIT_TRIGGER);
 171                         } else if (out == DEVICE_STATE_TRIG_RDY + 1) {
 172                                 sr_spew("Device triggered.");
 173                                 siglent_sds_set_wait_event(devc, WAIT_BLOCK);
 174                                 return SR_OK;
 175                         } else {
 176                                 sr_spew("Device did not enter ARM mode.");
 177                                 return SR_ERR;
 178                         }
 179                 } else { /* TODO: Implement history retrieval. */
 180                         unsigned int framecount;
 181                         char buf[200];
 182                         int ret;
 183
 184                         sr_dbg("Starting data capture for history frameset.");
 185                         if (siglent_sds_config_set(sdi, "FPAR?") != SR_OK)
 186                                 return SR_ERR;
 187                         ret = sr_scpi_read_data(sdi->conn, buf, 200);
 188                         if (ret < 0) {
 189                                 sr_err("Read error while reading data header.");
 190                                 return SR_ERR;
 191                         }
 192                         memcpy(&framecount, buf + 40, 4);
 193                         if (devc->limit_frames > framecount)
 194                                 sr_err("Frame limit higher than frames in buffer of device!");
 195                         else if (devc->limit_frames == 0)
 196                                 devc->limit_frames = framecount;
 197                         sr_dbg("Starting data capture for history frameset %" PRIu64 " of %" PRIu64,
 198                                 devc->num_frames + 1, devc->limit_frames);
 199                         if (siglent_sds_config_set(sdi, "FRAM %i", devc->num_frames + 1) != SR_OK)
 200                                 return SR_ERR;
 201                         if (siglent_sds_channel_start(sdi) != SR_OK)
 202                                 return SR_ERR;
 203                         siglent_sds_set_wait_event(devc, WAIT_STOP);
 204                 }
 205                 break;
 206         case NON_SPO_MODEL:
 207                 siglent_sds_set_wait_event(devc, WAIT_TRIGGER);
 208                 break;
 209         }
 210
 211         return SR_OK;
 212 }
 213
 214 /* Start reading data from the current channel. */
 215 SR_PRIV int siglent_sds_channel_start(const struct sr_dev_inst *sdi)
 216 {
 217         struct dev_context *devc;
 218         struct sr_channel *ch;
 219
 220         if (!(devc = sdi->priv))
 221                 return SR_ERR;
 222
 223         ch = devc->channel_entry->data;
 224
 225         sr_dbg("Starting reading data from channel %d.", ch->index + 1);
 226
 227         switch (devc->model->series->protocol) {
 228         case NON_SPO_MODEL:
 229         case SPO_MODEL:
 230                 if (ch->type == SR_CHANNEL_LOGIC) {
 231                         if (sr_scpi_send(sdi->conn, "D%d:WF?",
 232                                 ch->index + 1) != SR_OK)
 233                                 return SR_ERR;
 234                 } else {
 235                         if (sr_scpi_send(sdi->conn, "C%d:WF? ALL",
 236                                 ch->index + 1) != SR_OK)
 237                                 return SR_ERR;
 238                 }
 239                 siglent_sds_set_wait_event(devc, WAIT_NONE);
 240                 break;
 241         }
 242
 243         siglent_sds_set_wait_event(devc, WAIT_BLOCK);
 244
 245         devc->num_channel_bytes = 0;
 246         devc->num_header_bytes = 0;
 247         devc->num_block_bytes = 0;
 248
 249         return SR_OK;
 250 }
 251
 252 /* Read the header of a data block. */
 253 static int siglent_sds_read_header(struct sr_dev_inst *sdi)
 254 {
 255         struct sr_scpi_dev_inst *scpi = sdi->conn;
 256         struct dev_context *devc = sdi->priv;
 257         char *buf = (char *)devc->buffer;
 258         int ret, desc_length;
 259         int block_offset = 15; /* Offset for descriptor block. */
 260         long dataLength = 0;
 261
 262         /* Read header from device. */
 263         ret = sr_scpi_read_data(scpi, buf + devc->num_header_bytes,
 264                 devc->model->series->buffer_samples);
 265         if (ret < 346) {
 266                 sr_err("Read error while reading data header.");
 267                 return SR_ERR;
 268         }
 269         sr_dbg("Device returned %i bytes.", ret);
 270         devc->num_header_bytes += ret;
 271         buf += block_offset; /* Skip to start descriptor block. */
 272
 273         /* Parse WaveDescriptor header. */
 274         memcpy(&desc_length, buf + 36, 4); /* Descriptor block length */
 275         memcpy(&dataLength, buf + 60, 4); /* Data block length */
 276
 277         devc->block_header_size = desc_length + 15;
 278         ret = dataLength;
 279
 280         sr_dbg("Received data block header: '%s' -> block length %d.", buf, ret);
 281
 282         return ret;
 283 }
 284
 285 SR_PRIV int siglent_sds_receive(int fd, int revents, void *cb_data)
 286 {
 287         struct sr_dev_inst *sdi;
 288         struct sr_scpi_dev_inst *scpi;
 289         struct dev_context *devc;
 290         struct sr_datafeed_packet packet;
 291         struct sr_datafeed_analog analog;
 292         struct sr_analog_encoding encoding;
 293         struct sr_analog_meaning meaning;
 294         struct sr_analog_spec spec;
 295         struct sr_datafeed_logic logic;
 296         int len, i;
 297         struct sr_channel *ch;
 298         gsize expected_data_bytes = 0;
 299         char *memsize;
 300
 301         (void)fd;
 302
 303         if (!(sdi = cb_data))
 304                 return TRUE;
 305
 306         if (!(devc = sdi->priv))
 307                 return TRUE;
 308
 309         scpi = sdi->conn;
 310
 311         if (!(revents == G_IO_IN || revents == 0))
 312                 return TRUE;
 313
 314         memsize = NULL;
 315         if (sr_scpi_get_string(sdi->conn, "MSIZ?", &memsize) != SR_OK)
 316                 return SR_ERR;
 317
 318         switch (devc->wait_event) {
 319         case WAIT_NONE:
 320                 break;
 321         case WAIT_TRIGGER:
 322                 if (siglent_sds_trigger_wait(sdi) != SR_OK)
 323                         return TRUE;
 324                 if (siglent_sds_channel_start(sdi) != SR_OK)
 325                         return TRUE;
 326                 return TRUE;
 327         case WAIT_BLOCK:
 328                 if (siglent_sds_channel_start(sdi) != SR_OK)
 329                         return TRUE;
 330                 break;
 331         case WAIT_STOP:
 332                 if (siglent_sds_stop_wait(sdi) != SR_OK)
 333                         return TRUE;
 334                 if (siglent_sds_channel_start(sdi) != SR_OK)
 335                         return TRUE;
 336                 return TRUE;
 337         default:
 338                 sr_err("BUG: Unknown event target encountered.");
 339                 break;
 340         }
 341
 342         ch = devc->channel_entry->data;
 343
 344         if (devc->num_block_bytes == 0) {
 345
 346                 if (g_ascii_strcasecmp(memsize, "14M") == 0) {
 347                         sr_err("Device memory depth is set to 14Mpts, so please be patient.");
 348                         g_usleep(4900000); /* Sleep for large memory set. */
 349                 }
 350                 sr_dbg("New block header expected.");
 351                 len = siglent_sds_read_header(sdi);
 352                 expected_data_bytes = len;
 353                 if (len == 0)
 354                         /* Still reading the header. */
 355                         return TRUE;
 356                 if (len == -1) {
 357                         sr_err("Read error, aborting capture.");
 358                         packet.type = SR_DF_FRAME_END;
 359                         sr_session_send(sdi, &packet);
 360                         sdi->driver->dev_acquisition_stop(sdi);
 361                         return TRUE;
 362                 }
 363
 364                 if (devc->data_source == DATA_SOURCE_SCREEN
 365                         && (unsigned)len < expected_data_bytes) {
 366                         sr_dbg("Discarding short data block.");
 367                         sr_scpi_read_data(scpi, (char *)devc->buffer, len + 1);
 368                         return TRUE;
 369                 }
 370                 devc->num_block_bytes = len;
 371                 devc->num_block_read = 0;
 372         }
 373
 374         len = devc->num_block_bytes - devc->num_block_read;
 375         if (len > ACQ_BUFFER_SIZE)
 376                 len = ACQ_BUFFER_SIZE;
 377
 378         /* Offset the data block buffer past the IEEE header and description header. */
 379         devc->buffer += devc->block_header_size;
 380
 381         if (len == -1) {
 382                 sr_err("Read error, aborting capture.");
 383                 packet.type = SR_DF_FRAME_END;
 384                 sr_session_send(sdi, &packet);
 385                 sdi->driver->dev_acquisition_stop(sdi);
 386                 return TRUE;
 387         }
 388
 389         sr_dbg("Received %d bytes.", len);
 390
 391         devc->num_block_read += len;
 392
 393         if (ch->type == SR_CHANNEL_ANALOG) {
 394                 float vdiv = devc->vdiv[ch->index];
 395                 float offset = devc->vert_offset[ch->index];
 396                 GArray *float_data;
 397                 static GArray *data;
 398                 float voltage, vdivlog;
 399                 int digits;
 400
 401                 data = g_array_sized_new(FALSE, FALSE, sizeof(uint8_t), len);
 402                 g_array_append_vals(data, devc->buffer, len);
 403                 float_data = g_array_new(FALSE, FALSE, sizeof(float));
 404                 for (i = 0; i < len; i++) {
 405                         voltage = (float)g_array_index(data, int8_t, i) / 25;
 406                         voltage = ((vdiv * voltage) - offset);
 407                         g_array_append_val(float_data, voltage);
 408                 }
 409                 vdivlog = log10f(vdiv);
 410                 digits = -(int) vdivlog + (vdivlog < 0.0);
 411                 sr_analog_init(&analog, &encoding, &meaning, &spec, digits);
 412                 analog.meaning->channels = g_slist_append(NULL, ch);
 413                 analog.num_samples = float_data->len;
 414                 analog.data = (float *)float_data->data;
 415                 analog.meaning->mq = SR_MQ_VOLTAGE;
 416                 analog.meaning->unit = SR_UNIT_VOLT;
 417                 analog.meaning->mqflags = 0;
 418                 packet.type = SR_DF_ANALOG;
 419                 packet.payload = &analog;
 420                 sr_session_send(sdi, &packet);
 421                 g_slist_free(analog.meaning->channels);
 422                 g_array_free(data, TRUE);
 423         } else {
 424                 logic.length = len;
 425                 logic.unitsize = 1;
 426                 logic.data = devc->buffer;
 427                 packet.type = SR_DF_LOGIC;
 428                 packet.payload = &logic;
 429                 sr_session_send(sdi, &packet);
 430         }
 431
 432         if (devc->num_block_read == devc->num_block_bytes) {
 433                 sr_dbg("Block has been completed.");
 434                 sr_dbg("Preparing for possible next block.");
 435                 devc->num_header_bytes = 0;
 436                 devc->num_block_bytes = 0;
 437                 if (devc->data_source != DATA_SOURCE_SCREEN)
 438                         siglent_sds_set_wait_event(devc, WAIT_BLOCK);
 439                 if (!sr_scpi_read_complete(scpi)) {
 440                         sr_err("Read should have been completed.");
 441                         packet.type = SR_DF_FRAME_END;
 442                         sr_session_send(sdi, &packet);
 443                         sdi->driver->dev_acquisition_stop(sdi);
 444                         return TRUE;
 445                 }
 446                 devc->num_block_read = 0;
 447         } else {
 448                 sr_dbg("%" PRIu64 " of %" PRIu64 " block bytes read.",
 449                         devc->num_block_read, devc->num_block_bytes);
 450         }
 451         devc->num_channel_bytes += len;
 452         if (devc->num_channel_bytes < expected_data_bytes) {
 453                 /* Don't have the full data for this channel yet, re-run. */
 454                 return TRUE;
 455         }
 456         if (devc->channel_entry->next) {
 457                 /* We got the frame for this channel, now get the next channel. */
 458                 devc->channel_entry = devc->channel_entry->next;
 459                 siglent_sds_channel_start(sdi);
 460         } else {
 461                 /* Done with this frame. */
 462                 packet.type = SR_DF_FRAME_END;
 463                 sr_session_send(sdi, &packet);
 464
 465                 if (++devc->num_frames == devc->limit_frames) {
 466                         /* Last frame, stop capture. */
 467                         sdi->driver->dev_acquisition_stop(sdi);
 468                 } else {
 469                         /* Get the next frame, starting with the first channel. */
 470                         devc->channel_entry = devc->enabled_channels;
 471                         siglent_sds_capture_start(sdi);
 472
 473                         /* Start of next frame. */
 474                         packet.type = SR_DF_FRAME_BEGIN;
 475                         sr_session_send(sdi, &packet);
 476                 }
 477         }
 478
 479         return TRUE;
 480 }
 481
 482 SR_PRIV int siglent_sds_get_dev_cfg(const struct sr_dev_inst *sdi)
 483 {
 484         struct dev_context *devc;
 485         struct sr_channel *ch;
 486         char *cmd, *response;
 487         unsigned int i;
 488         int res, num_tokens;
 489         gchar **tokens;
 490         int len;
 491         float trigger_pos;
 492
 493         devc = sdi->priv;
 494
 495         /* Analog channel state. */
 496         for (i = 0; i < devc->model->analog_channels; i++) {
 497                 cmd = g_strdup_printf("C%i:TRA?", i + 1);
 498                 res = sr_scpi_get_bool(sdi->conn, cmd, &devc->analog_channels[i]);
 499                 g_free(cmd);
 500                 if (res != SR_OK)
 501                         return SR_ERR;
 502                 ch = g_slist_nth_data(sdi->channels, i);
 503                 ch->enabled = devc->analog_channels[i];
 504         }
 505         sr_dbg("Current analog channel state:");
 506         for (i = 0; i < devc->model->analog_channels; i++)
 507                 sr_dbg("CH%d %s", i + 1, devc->analog_channels[i] ? "On" : "Off");
 508
 509         /* Digital channel state. */
 510         if (devc->model->has_digital) {
 511                 gboolean status;
 512
 513                 sr_dbg("Check logic analyzer channel state.");
 514                 devc->la_enabled = FALSE;
 515                 cmd = g_strdup_printf("DGST?");
 516                 res = sr_scpi_get_bool(sdi->conn, cmd, &status);
 517                 g_free(cmd);
 518                 if (res != SR_OK)
 519                         return SR_ERR;
 520                 sr_dbg("Logic analyzer status: %s", status ? "On" : "Off");
 521                 if (status) {
 522                         devc->la_enabled = TRUE;
 523                         for (i = 0; i < ARRAY_SIZE(devc->digital_channels); i++) {
 524                                 cmd = g_strdup_printf("D%i:DGCH?", i);
 525                                 res = sr_scpi_get_bool(sdi->conn, cmd, &devc->digital_channels[i]);
 526                                 g_free(cmd);
 527                                 if (res != SR_OK)
 528                                         return SR_ERR;
 529                                 ch = g_slist_nth_data(sdi->channels, i + devc->model->analog_channels);
 530                                 ch->enabled = devc->digital_channels[i];
 531                                 sr_dbg("D%d: %s", i, devc->digital_channels[i] ? "On" : "Off");
 532                         }
 533                 } else {
 534                         for (i = 0; i < ARRAY_SIZE(devc->digital_channels); i++) {
 535                                 ch = g_slist_nth_data(sdi->channels, i + devc->model->analog_channels);
 536                                 devc->digital_channels[i] = FALSE;
 537                                 ch->enabled = devc->digital_channels[i];
 538                                 sr_dbg("D%d: %s", i, devc->digital_channels[i] ? "On" : "Off");
 539                         }
 540                 }
 541         }
 542
 543         /* Timebase. */
 544         if (sr_scpi_get_float(sdi->conn, ":TDIV?", &devc->timebase) != SR_OK)
 545                 return SR_ERR;
 546         sr_dbg("Current timebase: %g.", devc->timebase);
 547
 548         /* Probe attenuation. */
 549         for (i = 0; i < devc->model->analog_channels; i++) {
 550                 cmd = g_strdup_printf("C%d:ATTN?", i + 1);
 551                 res = sr_scpi_get_float(sdi->conn, cmd, &devc->attenuation[i]);
 552                 g_free(cmd);
 553                 if (res != SR_OK)
 554                         return SR_ERR;
 555         }
 556         sr_dbg("Current probe attenuation:");
 557         for (i = 0; i < devc->model->analog_channels; i++)
 558                 sr_dbg("CH%d %g", i + 1, devc->attenuation[i]);
 559
 560         /* Vertical gain and offset. */
 561         if (siglent_sds_get_dev_cfg_vertical(sdi) != SR_OK)
 562                 return SR_ERR;
 563
 564         /* Coupling. */
 565         for (i = 0; i < devc->model->analog_channels; i++) {
 566                 cmd = g_strdup_printf("C%d:CPL?", i + 1);
 567                 res = sr_scpi_get_string(sdi->conn, cmd, &devc->coupling[i]);
 568                 g_free(cmd);
 569                 if (res != SR_OK)
 570                         return SR_ERR;
 571         }
 572
 573         sr_dbg("Current coupling:");
 574         for (i = 0; i < devc->model->analog_channels; i++)
 575                 sr_dbg("CH%d %s", i + 1, devc->coupling[i]);
 576
 577         /* Trigger source. */
 578         response = NULL;
 579         tokens = NULL;
 580         if (sr_scpi_get_string(sdi->conn, "TRSE?", &response) != SR_OK)
 581                 return SR_ERR;
 582         tokens = g_strsplit(response, ",", 0);
 583         for (num_tokens = 0; tokens[num_tokens] != NULL; num_tokens++);
 584         if (num_tokens < 4) {
 585                 sr_dbg("IDN response not according to spec: %80.s.", response);
 586                 g_strfreev(tokens);
 587                 g_free(response);
 588                 return SR_ERR_DATA;
 589         }
 590         g_free(response);
 591         devc->trigger_source = g_strstrip(g_strdup(tokens[2]));
 592         sr_dbg("Current trigger source: %s.", devc->trigger_source);
 593
 594         /* TODO: Horizontal trigger position. */
 595         response = "";
 596         trigger_pos = 0;
 597         if (sr_scpi_get_string(sdi->conn, g_strdup_printf("%s:TRDL?", devc->trigger_source), &response) != SR_OK)
 598                 return SR_ERR;
 599         len = strlen(response);
 600         if (!g_ascii_strcasecmp(response + (len - 2), "us")) {
 601                 trigger_pos = atof(response) / SR_GHZ(1);
 602                 sr_dbg("Current trigger position us %s.", response);
 603         } else if (!g_ascii_strcasecmp(response + (len - 2), "ns")) {
 604                 trigger_pos = atof(response) / SR_MHZ(1);
 605                 sr_dbg("Current trigger position ms %s.", response);
 606         } else if (!g_ascii_strcasecmp(response + (len - 2), "ms")) {
 607                 trigger_pos = atof(response) / SR_KHZ(1);
 608                 sr_dbg("Current trigger position ns %s.", response);
 609         } else if (!g_ascii_strcasecmp(response + (len - 2), "s")) {
 610                 trigger_pos = atof(response);
 611                 sr_dbg("Current trigger position s %s.", response);
 612         };
 613         devc->horiz_triggerpos = trigger_pos;
 614
 615         sr_dbg("Current horizontal trigger position %.10f", devc->horiz_triggerpos);
 616
 617         /* Trigger slope. */
 618         cmd = g_strdup_printf("%s:TRSL?", devc->trigger_source);
 619         res = sr_scpi_get_string(sdi->conn, cmd, &devc->trigger_slope);
 620         g_free(cmd);
 621         if (res != SR_OK)
 622                 return SR_ERR;
 623         sr_dbg("Current trigger slope: %s.", devc->trigger_slope);
 624
 625         /* Trigger level. */
 626         cmd = g_strdup_printf("%s:TRLV?", devc->trigger_source);
 627         res = sr_scpi_get_float(sdi->conn, cmd, &devc->trigger_level);
 628         g_free(cmd);
 629         if (res != SR_OK)
 630                 return SR_ERR;
 631         sr_dbg("Current trigger level: %g.", devc->trigger_level);
 632         return SR_OK;
 633 }
 634
 635 SR_PRIV int siglent_sds_get_dev_cfg_vertical(const struct sr_dev_inst *sdi)
 636 {
 637         struct dev_context *devc;
 638         char *cmd;
 639         unsigned int i;
 640         int res;
 641
 642         devc = sdi->priv;
 643
 644         /* Vertical gain. */
 645         for (i = 0; i < devc->model->analog_channels; i++) {
 646                 cmd = g_strdup_printf("C%d:VDIV?", i + 1);
 647                 res = sr_scpi_get_float(sdi->conn, cmd, &devc->vdiv[i]);
 648                 g_free(cmd);
 649                 if (res != SR_OK)
 650                         return SR_ERR;
 651         }
 652         sr_dbg("Current vertical gain:");
 653         for (i = 0; i < devc->model->analog_channels; i++)
 654                 sr_dbg("CH%d %g", i + 1, devc->vdiv[i]);
 655
 656         /* Vertical offset. */
 657         for (i = 0; i < devc->model->analog_channels; i++) {
 658                 cmd = g_strdup_printf("C%d:OFST?", i + 1);
 659                 res = sr_scpi_get_float(sdi->conn, cmd, &devc->vert_offset[i]);
 660                 g_free(cmd);
 661                 if (res != SR_OK)
 662                         return SR_ERR;
 663         }
 664         sr_dbg("Current vertical offset:");
 665         for (i = 0; i < devc->model->analog_channels; i++)
 666                 sr_dbg("CH%d %g", i + 1, devc->vert_offset[i]);
 667
 668         return SR_OK;
 669 }
 670
 671 SR_PRIV int siglent_sds_get_dev_cfg_horizontal(const struct sr_dev_inst *sdi)
 672 {
 673         struct dev_context *devc;
 674         char *cmd;
 675         int res;
 676         char *sample_points_string;
 677         float samplerate_scope, fvalue;
 678         char *first, *concat;
 679
 680         devc = sdi->priv;
 681         cmd = g_strdup_printf("SANU? C1");
 682         res = sr_scpi_get_string(sdi->conn, cmd, &sample_points_string);
 683         g_free(cmd);
 684         if (res != SR_OK)
 685                 return SR_ERR;
 686         if (g_strstr_len(sample_points_string, -1, "Mpts") != NULL) {
 687                 sample_points_string[strlen(sample_points_string) - 4] = '\0';
 688
 689                 if (g_strstr_len(sample_points_string, -1, ".") != NULL) {
 690                         first = strtok(sample_points_string, ".");
 691                         concat = strcat(first, strtok(NULL, "."));
 692                         if (sr_atof_ascii(concat, &fvalue) != SR_OK || fvalue == 0.0) {
 693                                 sr_dbg("Invalid float converted from scope response.");
 694                                 return SR_ERR;
 695                         }
 696                 } else {
 697                         if (sr_atof_ascii(sample_points_string, &fvalue) != SR_OK || fvalue == 0.0) {
 698                                 sr_dbg("Invalid float converted from scope response.");
 699                                 return SR_ERR;
 700                         }
 701                 }
 702                 samplerate_scope = fvalue * 100000;
 703         } else {
 704                 sample_points_string[strlen(sample_points_string) - 4] = '\0';
 705                 if (sr_atof_ascii(sample_points_string, &fvalue) != SR_OK || fvalue == 0.0) {
 706                         sr_dbg("Invalid float converted from scope response.");
 707                         return SR_ERR;
 708                 }
 709                 samplerate_scope = fvalue * 1000;
 710         }
 711         /* Get the timebase. */
 712         if (sr_scpi_get_float(sdi->conn, ":TDIV?", &devc->timebase) != SR_OK)
 713                 return SR_ERR;
 714         sr_dbg("Current timebase: %g.", devc->timebase);
 715         devc->samplerate = samplerate_scope / (devc->timebase * devc->model->series->num_horizontal_divs);
 716
 717         return SR_OK;
 718 }