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 data_length = 0;
 261
 262         /* Read header from device. */
 263         ret = sr_scpi_read_data(scpi, buf, SIGLENT_HEADER_SIZE);
 264         if (ret < SIGLENT_HEADER_SIZE) {
 265                 sr_err("Read error while reading data header.");
 266                 return SR_ERR;
 267         }
 268         sr_dbg("Device returned %i bytes.", ret);
 269         devc->num_header_bytes += ret;
 270         buf += block_offset; /* Skip to start descriptor block. */
 271
 272         /* Parse WaveDescriptor header. */
 273         memcpy(&desc_length, buf + 36, 4); /* Descriptor block length */
 274         memcpy(&data_length, buf + 60, 4); /* Data block length */
 275
 276         devc->block_header_size = desc_length + 15;
 277         devc->num_samples = data_length;
 278
 279         sr_dbg("Received data block header: '%s' -> block length %d.", buf, ret);
 280
 281         return ret;
 282 }
 283
 284 SR_PRIV int siglent_sds_receive(int fd, int revents, void *cb_data)
 285 {
 286         struct sr_dev_inst *sdi;
 287         struct sr_scpi_dev_inst *scpi;
 288         struct dev_context *devc;
 289         struct sr_datafeed_packet packet;
 290         struct sr_datafeed_analog analog;
 291         struct sr_analog_encoding encoding;
 292         struct sr_analog_meaning meaning;
 293         struct sr_analog_spec spec;
 294         struct sr_datafeed_logic logic;
 295         int len, i;
 296         struct sr_channel *ch;
 297
 298         (void)fd;
 299
 300         if (!(sdi = cb_data))
 301                 return TRUE;
 302
 303         if (!(devc = sdi->priv))
 304                 return TRUE;
 305
 306         scpi = sdi->conn;
 307
 308         if (!(revents == G_IO_IN || revents == 0))
 309                 return TRUE;
 310
 311         switch (devc->wait_event) {
 312         case WAIT_NONE:
 313                 break;
 314         case WAIT_TRIGGER:
 315                 if (siglent_sds_trigger_wait(sdi) != SR_OK)
 316                         return TRUE;
 317                 if (siglent_sds_channel_start(sdi) != SR_OK)
 318                         return TRUE;
 319                 return TRUE;
 320         case WAIT_BLOCK:
 321                 if (siglent_sds_channel_start(sdi) != SR_OK)
 322                         return TRUE;
 323                 break;
 324         case WAIT_STOP:
 325                 if (siglent_sds_stop_wait(sdi) != SR_OK)
 326                         return TRUE;
 327                 if (siglent_sds_channel_start(sdi) != SR_OK)
 328                         return TRUE;
 329                 return TRUE;
 330         default:
 331                 sr_err("BUG: Unknown event target encountered.");
 332                 break;
 333         }
 334         ch = devc->channel_entry->data;
 335         len = 0;
 336
 337         if (devc->num_block_bytes == 0) {
 338
 339                 if (devc->samplerate >= 14000000) {
 340                         sr_err("Device memory depth is set to 14Mpts, so please be patient.");
 341                         g_usleep(4900000); /* Sleep for large memory set. */
 342                 }
 343                 if (sr_scpi_read_begin(scpi) != SR_OK)
 344                         return TRUE;
 345                 sr_dbg("New block header expected.");
 346                 len = siglent_sds_read_header(sdi);
 347                 if (len == 0)
 348                         /* Still reading the header. */
 349                         return TRUE;
 350                 if (len == -1) {
 351                         sr_err("Read error, aborting capture.");
 352                         packet.type = SR_DF_FRAME_END;
 353                         sr_session_send(sdi, &packet);
 354                         sdi->driver->dev_acquisition_stop(sdi);
 355                         return TRUE;
 356                 }
 357                 devc->num_block_bytes = 0;
 358                 devc->num_block_read = 0;
 359         }
 360
 361         if (len == -1) {
 362                 sr_err("Read error, aborting capture.");
 363                 packet.type = SR_DF_FRAME_END;
 364                 sr_session_send(sdi, &packet);
 365                 sdi->driver->dev_acquisition_stop(sdi);
 366                 return TRUE;
 367         }
 368
 369         while (devc->num_block_bytes < devc->num_samples) {
 370                 len = sr_scpi_read_data(scpi, (char *)devc->buffer, devc->num_samples);
 371                 if (len == -1) {
 372                         sr_err("Read error, aborting capture.");
 373                         packet.type = SR_DF_FRAME_END;
 374                         sr_session_send(sdi, &packet);
 375                         sdi->driver->dev_acquisition_stop(sdi);
 376                         return TRUE;
 377                 }
 378                 devc->num_block_read += 1;
 379                 devc->num_block_bytes += len;
 380                 if (devc->num_block_bytes >= devc->num_samples ) {
 381                         /* Offset the data block buffer past the IEEE header and description header. */
 382                         devc->buffer += devc->block_header_size;
 383                         len = devc->num_samples;
 384                 }
 385                 sr_dbg("Received block: %i, %d bytes.", devc->num_block_read, len);
 386                 if (ch->type == SR_CHANNEL_ANALOG) {
 387                         float vdiv = devc->vdiv[ch->index];
 388                         float offset = devc->vert_offset[ch->index];
 389                         GArray *float_data;
 390                         static GArray *data;
 391                         float voltage, vdivlog;
 392                         int digits;
 393
 394                         data = g_array_sized_new(FALSE, FALSE, sizeof(uint8_t), len);
 395                         g_array_append_vals(data, devc->buffer, len);
 396                         float_data = g_array_new(FALSE, FALSE, sizeof(float));
 397                         for (i = 0; i < len; i++) {
 398                                 voltage = (float)g_array_index(data, int8_t, i) / 25;
 399                                 voltage = ((vdiv * voltage) - offset);
 400                                 g_array_append_val(float_data, voltage);
 401                         }
 402                         vdivlog = log10f(vdiv);
 403                         digits = -(int) vdivlog + (vdivlog < 0.0);
 404                         sr_analog_init(&analog, &encoding, &meaning, &spec, digits);
 405                         analog.meaning->channels = g_slist_append(NULL, ch);
 406                         analog.num_samples = float_data->len;
 407                         analog.data = (float *)float_data->data;
 408                         analog.meaning->mq = SR_MQ_VOLTAGE;
 409                         analog.meaning->unit = SR_UNIT_VOLT;
 410                         analog.meaning->mqflags = 0;
 411                         packet.type = SR_DF_ANALOG;
 412                         packet.payload = &analog;
 413                         sr_session_send(sdi, &packet);
 414                         g_slist_free(analog.meaning->channels);
 415                         g_array_free(data, TRUE);
 416                 } else {
 417                         logic.length = len;
 418                         logic.unitsize = 1;
 419                         logic.data = devc->buffer;
 420                         packet.type = SR_DF_LOGIC;
 421                         packet.payload = &logic;
 422                         sr_session_send(sdi, &packet);
 423                 }
 424
 425                 if (devc->num_samples == devc->num_block_bytes) {
 426                         sr_dbg("Transfer has been completed.");
 427                         devc->num_header_bytes = 0;
 428                         devc->num_block_bytes = 0;
 429                         if (!sr_scpi_read_complete(scpi)) {
 430                                 sr_err("Read should have been completed.");
 431                                 packet.type = SR_DF_FRAME_END;
 432                                 sr_session_send(sdi, &packet);
 433                                 sdi->driver->dev_acquisition_stop(sdi);
 434                                 return TRUE;
 435                         }
 436                         devc->num_block_read = 0;
 437                 } else {
 438                         sr_dbg("%" PRIu64 " of %" PRIu64 " block bytes read.",
 439                                 devc->num_block_bytes, devc->num_samples);
 440                 }
 441         }
 442
 443         if (devc->channel_entry->next) {
 444                 /* We got the frame for this channel, now get the next channel. */
 445                 devc->channel_entry = devc->channel_entry->next;
 446                 siglent_sds_channel_start(sdi);
 447         } else {
 448                 /* Done with this frame. */
 449                 packet.type = SR_DF_FRAME_END;
 450                 sr_session_send(sdi, &packet);
 451
 452                 if (++devc->num_frames == devc->limit_frames) {
 453                         /* Last frame, stop capture. */
 454                         sdi->driver->dev_acquisition_stop(sdi);
 455                 } else {
 456                         /* Get the next frame, starting with the first channel. */
 457                         devc->channel_entry = devc->enabled_channels;
 458                         siglent_sds_capture_start(sdi);
 459
 460                         /* Start of next frame. */
 461                         packet.type = SR_DF_FRAME_BEGIN;
 462                         sr_session_send(sdi, &packet);
 463                 }
 464         }
 465
 466         return TRUE;
 467 }
 468
 469 SR_PRIV int siglent_sds_get_dev_cfg(const struct sr_dev_inst *sdi)
 470 {
 471         struct dev_context *devc;
 472         struct sr_channel *ch;
 473         char *cmd, *response;
 474         unsigned int i;
 475         int res, num_tokens;
 476         gchar **tokens;
 477         int len;
 478         float trigger_pos;
 479
 480         devc = sdi->priv;
 481
 482         /* Analog channel state. */
 483         for (i = 0; i < devc->model->analog_channels; i++) {
 484                 cmd = g_strdup_printf("C%i:TRA?", i + 1);
 485                 res = sr_scpi_get_bool(sdi->conn, cmd, &devc->analog_channels[i]);
 486                 g_free(cmd);
 487                 if (res != SR_OK)
 488                         return SR_ERR;
 489                 ch = g_slist_nth_data(sdi->channels, i);
 490                 ch->enabled = devc->analog_channels[i];
 491         }
 492         sr_dbg("Current analog channel state:");
 493         for (i = 0; i < devc->model->analog_channels; i++)
 494                 sr_dbg("CH%d %s", i + 1, devc->analog_channels[i] ? "On" : "Off");
 495
 496         /* Digital channel state. */
 497         if (devc->model->has_digital) {
 498                 gboolean status;
 499
 500                 sr_dbg("Check logic analyzer channel state.");
 501                 devc->la_enabled = FALSE;
 502                 cmd = g_strdup_printf("DGST?");
 503                 res = sr_scpi_get_bool(sdi->conn, cmd, &status);
 504                 g_free(cmd);
 505                 if (res != SR_OK)
 506                         return SR_ERR;
 507                 sr_dbg("Logic analyzer status: %s", status ? "On" : "Off");
 508                 if (status) {
 509                         devc->la_enabled = TRUE;
 510                         for (i = 0; i < ARRAY_SIZE(devc->digital_channels); i++) {
 511                                 cmd = g_strdup_printf("D%i:DGCH?", i);
 512                                 res = sr_scpi_get_bool(sdi->conn, cmd, &devc->digital_channels[i]);
 513                                 g_free(cmd);
 514                                 if (res != SR_OK)
 515                                         return SR_ERR;
 516                                 ch = g_slist_nth_data(sdi->channels, i + devc->model->analog_channels);
 517                                 ch->enabled = devc->digital_channels[i];
 518                                 sr_dbg("D%d: %s", i, devc->digital_channels[i] ? "On" : "Off");
 519                         }
 520                 } else {
 521                         for (i = 0; i < ARRAY_SIZE(devc->digital_channels); i++) {
 522                                 ch = g_slist_nth_data(sdi->channels, i + devc->model->analog_channels);
 523                                 devc->digital_channels[i] = FALSE;
 524                                 ch->enabled = devc->digital_channels[i];
 525                                 sr_dbg("D%d: %s", i, devc->digital_channels[i] ? "On" : "Off");
 526                         }
 527                 }
 528         }
 529
 530         /* Timebase. */
 531         if (sr_scpi_get_float(sdi->conn, ":TDIV?", &devc->timebase) != SR_OK)
 532                 return SR_ERR;
 533         sr_dbg("Current timebase: %g.", devc->timebase);
 534
 535         /* Probe attenuation. */
 536         for (i = 0; i < devc->model->analog_channels; i++) {
 537                 cmd = g_strdup_printf("C%d:ATTN?", i + 1);
 538                 res = sr_scpi_get_float(sdi->conn, cmd, &devc->attenuation[i]);
 539                 g_free(cmd);
 540                 if (res != SR_OK)
 541                         return SR_ERR;
 542         }
 543         sr_dbg("Current probe attenuation:");
 544         for (i = 0; i < devc->model->analog_channels; i++)
 545                 sr_dbg("CH%d %g", i + 1, devc->attenuation[i]);
 546
 547         /* Vertical gain and offset. */
 548         if (siglent_sds_get_dev_cfg_vertical(sdi) != SR_OK)
 549                 return SR_ERR;
 550
 551         /* Coupling. */
 552         for (i = 0; i < devc->model->analog_channels; i++) {
 553                 cmd = g_strdup_printf("C%d:CPL?", i + 1);
 554                 res = sr_scpi_get_string(sdi->conn, cmd, &devc->coupling[i]);
 555                 g_free(cmd);
 556                 if (res != SR_OK)
 557                         return SR_ERR;
 558         }
 559
 560         sr_dbg("Current coupling:");
 561         for (i = 0; i < devc->model->analog_channels; i++)
 562                 sr_dbg("CH%d %s", i + 1, devc->coupling[i]);
 563
 564         /* Trigger source. */
 565         response = NULL;
 566         tokens = NULL;
 567         if (sr_scpi_get_string(sdi->conn, "TRSE?", &response) != SR_OK)
 568                 return SR_ERR;
 569         tokens = g_strsplit(response, ",", 0);
 570         for (num_tokens = 0; tokens[num_tokens] != NULL; num_tokens++);
 571         if (num_tokens < 4) {
 572                 sr_dbg("IDN response not according to spec: %80.s.", response);
 573                 g_strfreev(tokens);
 574                 g_free(response);
 575                 return SR_ERR_DATA;
 576         }
 577         g_free(response);
 578         devc->trigger_source = g_strstrip(g_strdup(tokens[2]));
 579         sr_dbg("Current trigger source: %s.", devc->trigger_source);
 580
 581         /* TODO: Horizontal trigger position. */
 582         response = "";
 583         trigger_pos = 0;
 584         if (sr_scpi_get_string(sdi->conn, g_strdup_printf("%s:TRDL?", devc->trigger_source), &response) != SR_OK)
 585                 return SR_ERR;
 586         len = strlen(response);
 587         if (!g_ascii_strcasecmp(response + (len - 2), "us")) {
 588                 trigger_pos = atof(response) / SR_GHZ(1);
 589                 sr_dbg("Current trigger position us %s.", response);
 590         } else if (!g_ascii_strcasecmp(response + (len - 2), "ns")) {
 591                 trigger_pos = atof(response) / SR_MHZ(1);
 592                 sr_dbg("Current trigger position ms %s.", response);
 593         } else if (!g_ascii_strcasecmp(response + (len - 2), "ms")) {
 594                 trigger_pos = atof(response) / SR_KHZ(1);
 595                 sr_dbg("Current trigger position ns %s.", response);
 596         } else if (!g_ascii_strcasecmp(response + (len - 2), "s")) {
 597                 trigger_pos = atof(response);
 598                 sr_dbg("Current trigger position s %s.", response);
 599         };
 600         devc->horiz_triggerpos = trigger_pos;
 601
 602         sr_dbg("Current horizontal trigger position %.10f", devc->horiz_triggerpos);
 603
 604         /* Trigger slope. */
 605         cmd = g_strdup_printf("%s:TRSL?", devc->trigger_source);
 606         res = sr_scpi_get_string(sdi->conn, cmd, &devc->trigger_slope);
 607         g_free(cmd);
 608         if (res != SR_OK)
 609                 return SR_ERR;
 610         sr_dbg("Current trigger slope: %s.", devc->trigger_slope);
 611
 612         /* Trigger level. */
 613         cmd = g_strdup_printf("%s:TRLV?", devc->trigger_source);
 614         res = sr_scpi_get_float(sdi->conn, cmd, &devc->trigger_level);
 615         g_free(cmd);
 616         if (res != SR_OK)
 617                 return SR_ERR;
 618         sr_dbg("Current trigger level: %g.", devc->trigger_level);
 619         return SR_OK;
 620 }
 621
 622 SR_PRIV int siglent_sds_get_dev_cfg_vertical(const struct sr_dev_inst *sdi)
 623 {
 624         struct dev_context *devc;
 625         char *cmd;
 626         unsigned int i;
 627         int res;
 628
 629         devc = sdi->priv;
 630
 631         /* Vertical gain. */
 632         for (i = 0; i < devc->model->analog_channels; i++) {
 633                 cmd = g_strdup_printf("C%d:VDIV?", i + 1);
 634                 res = sr_scpi_get_float(sdi->conn, cmd, &devc->vdiv[i]);
 635                 g_free(cmd);
 636                 if (res != SR_OK)
 637                         return SR_ERR;
 638         }
 639         sr_dbg("Current vertical gain:");
 640         for (i = 0; i < devc->model->analog_channels; i++)
 641                 sr_dbg("CH%d %g", i + 1, devc->vdiv[i]);
 642
 643         /* Vertical offset. */
 644         for (i = 0; i < devc->model->analog_channels; i++) {
 645                 cmd = g_strdup_printf("C%d:OFST?", i + 1);
 646                 res = sr_scpi_get_float(sdi->conn, cmd, &devc->vert_offset[i]);
 647                 g_free(cmd);
 648                 if (res != SR_OK)
 649                         return SR_ERR;
 650         }
 651         sr_dbg("Current vertical offset:");
 652         for (i = 0; i < devc->model->analog_channels; i++)
 653                 sr_dbg("CH%d %g", i + 1, devc->vert_offset[i]);
 654
 655         return SR_OK;
 656 }
 657
 658 SR_PRIV int siglent_sds_get_dev_cfg_horizontal(const struct sr_dev_inst *sdi)
 659 {
 660         struct dev_context *devc;
 661         char *cmd;
 662         int res;
 663         char *sample_points_string;
 664         float samplerate_scope, fvalue;
 665         char *first, *concat;
 666
 667         devc = sdi->priv;
 668         cmd = g_strdup_printf("SANU? C1");
 669         res = sr_scpi_get_string(sdi->conn, cmd, &sample_points_string);
 670         g_free(cmd);
 671         if (res != SR_OK)
 672                 return SR_ERR;
 673         if (g_strstr_len(sample_points_string, -1, "Mpts") != NULL) {
 674                 sample_points_string[strlen(sample_points_string) - 4] = '\0';
 675
 676                 if (g_strstr_len(sample_points_string, -1, ".") != NULL) {
 677                         first = strtok(sample_points_string, ".");
 678                         concat = strcat(first, strtok(NULL, "."));
 679                         if (sr_atof_ascii(concat, &fvalue) != SR_OK || fvalue == 0.0) {
 680                                 sr_dbg("Invalid float converted from scope response.");
 681                                 return SR_ERR;
 682                         }
 683                 } else {
 684                         if (sr_atof_ascii(sample_points_string, &fvalue) != SR_OK || fvalue == 0.0) {
 685                                 sr_dbg("Invalid float converted from scope response.");
 686                                 return SR_ERR;
 687                         }
 688                 }
 689                 samplerate_scope = fvalue * 100000;
 690         } else {
 691                 sample_points_string[strlen(sample_points_string) - 4] = '\0';
 692                 if (sr_atof_ascii(sample_points_string, &fvalue) != SR_OK || fvalue == 0.0) {
 693                         sr_dbg("Invalid float converted from scope response.");
 694                         return SR_ERR;
 695                 }
 696                 samplerate_scope = fvalue * 1000;
 697         }
 698         /* Get the timebase. */
 699         if (sr_scpi_get_float(sdi->conn, ":TDIV?", &devc->timebase) != SR_OK)
 700                 return SR_ERR;
 701         sr_dbg("Current timebase: %g.", devc->timebase);
 702         devc->samplerate = samplerate_scope / (devc->timebase * devc->model->series->num_horizontal_divs);
 703
 704         return SR_OK;
 705 }