src/hardware/hantek-dso/dso.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
   5  * With protocol information from the hantekdso project,
   6  * Copyright (C) 2008 Oleg Khudyakov <prcoder@gmail.com>
   7  *
   8  * This program is free software: you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation, either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include <config.h>
  23 #include <string.h>
  24 #include <glib.h>
  25 #include <libusb.h>
  26 #include <libsigrok/libsigrok.h>
  27 #include "libsigrok-internal.h"
  28 #include "dso.h"
  29
  30 #define NUM_CHANNELS 2
  31
  32 extern struct sr_dev_driver hantek_dso_driver_info;
  33
  34 static int send_begin(const struct sr_dev_inst *sdi)
  35 {
  36         struct sr_usb_dev_inst *usb;
  37         int ret;
  38         unsigned char buffer[] = {0x0f, 0x03, 0x03, 0x03, 0x68, 0xac, 0xfe,
  39         0x00, 0x01, 0x00};
  40
  41         sr_dbg("Sending CTRL_BEGINCOMMAND.");
  42
  43         usb = sdi->conn;
  44         if ((ret = libusb_control_transfer(usb->devhdl,
  45                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_BEGINCOMMAND,
  46                         0, 0, buffer, sizeof(buffer), 200)) != sizeof(buffer)) {
  47                 sr_err("Failed to send begincommand: %s.",
  48                        libusb_error_name(ret));
  49                 return SR_ERR;
  50         }
  51
  52         return SR_OK;
  53 }
  54
  55 static int send_bulkcmd(const struct sr_dev_inst *sdi, uint8_t *cmdstring, int cmdlen)
  56 {
  57         struct sr_usb_dev_inst *usb;
  58         int ret, tmp;
  59
  60         usb = sdi->conn;
  61
  62         if (send_begin(sdi) != SR_OK)
  63                 return SR_ERR;
  64
  65         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT, cmdstring,
  66                         cmdlen, &tmp, 200)) != 0)
  67                 return SR_ERR;
  68
  69         return SR_OK;
  70 }
  71
  72 static int dso_getmps(libusb_device *dev)
  73 {
  74         struct libusb_device_descriptor des;
  75         struct libusb_config_descriptor *conf_dsc;
  76         const struct libusb_interface_descriptor *intf_dsc;
  77         int mps;
  78
  79         libusb_get_device_descriptor(dev, &des);
  80
  81         if (des.bNumConfigurations != 1)
  82                 return 0;
  83
  84         if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
  85                 return 0;
  86
  87         mps = 0;
  88         intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
  89         if (intf_dsc->bNumEndpoints != 2)
  90                 goto err;
  91
  92         if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
  93             (2 | LIBUSB_ENDPOINT_OUT))
  94                 /* The first endpoint should be 2 (outbound). */
  95                 goto err;
  96
  97         if ((intf_dsc->endpoint[1].bEndpointAddress & 0x8f) !=
  98             (6 | LIBUSB_ENDPOINT_IN))
  99                 /* The second endpoint should be 6 (inbound). */
 100                 goto err;
 101
 102         mps = intf_dsc->endpoint[1].wMaxPacketSize;
 103
 104 err:
 105         if (conf_dsc)
 106                 libusb_free_config_descriptor(conf_dsc);
 107
 108         return mps;
 109 }
 110
 111 SR_PRIV int dso_open(struct sr_dev_inst *sdi)
 112 {
 113         struct dev_context *devc;
 114         struct drv_context *drvc = hantek_dso_driver_info.context;
 115         struct sr_usb_dev_inst *usb;
 116         struct libusb_device_descriptor des;
 117         libusb_device **devlist;
 118         int err, i;
 119         char connection_id[64];
 120
 121         devc = sdi->priv;
 122         usb = sdi->conn;
 123
 124         if (sdi->status == SR_ST_ACTIVE)
 125                 /* already in use */
 126                 return SR_ERR;
 127
 128         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 129         for (i = 0; devlist[i]; i++) {
 130                 libusb_get_device_descriptor(devlist[i], &des);
 131
 132                 if (des.idVendor != devc->profile->fw_vid
 133                     || des.idProduct != devc->profile->fw_pid)
 134                         continue;
 135
 136                 if ((sdi->status == SR_ST_INITIALIZING) ||
 137                                 (sdi->status == SR_ST_INACTIVE)) {
 138                         /*
 139                          * Check device by its physical USB bus/port address.
 140                          */
 141                         usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 142                         if (strcmp(sdi->connection_id, connection_id))
 143                                 /* This is not the one. */
 144                                 continue;
 145                 }
 146
 147                 if (!(err = libusb_open(devlist[i], &usb->devhdl))) {
 148                         if (usb->address == 0xff)
 149                                 /*
 150                                  * first time we touch this device after firmware upload,
 151                                  * so we don't know the address yet.
 152                                  */
 153                                 usb->address = libusb_get_device_address(devlist[i]);
 154
 155                         if (!(devc->epin_maxpacketsize = dso_getmps(devlist[i])))
 156                                 sr_err("Wrong endpoint profile.");
 157                         else {
 158                                 sdi->status = SR_ST_ACTIVE;
 159                                 sr_info("Opened device on %d.%d (logical) / "
 160                                                 "%s (physical) interface %d.",
 161                                         usb->bus, usb->address,
 162                                         sdi->connection_id, USB_INTERFACE);
 163                         }
 164                 } else {
 165                         sr_err("Failed to open device: %s.",
 166                                libusb_error_name(err));
 167                 }
 168
 169                 /* If we made it here, we handled the device (somehow). */
 170                 break;
 171         }
 172         libusb_free_device_list(devlist, 1);
 173
 174         if (sdi->status != SR_ST_ACTIVE)
 175                 return SR_ERR;
 176
 177         return SR_OK;
 178 }
 179
 180 SR_PRIV void dso_close(struct sr_dev_inst *sdi)
 181 {
 182         struct sr_usb_dev_inst *usb;
 183
 184         usb = sdi->conn;
 185
 186         if (!usb->devhdl)
 187                 return;
 188
 189         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 190                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 191         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 192         libusb_close(usb->devhdl);
 193         usb->devhdl = NULL;
 194         sdi->status = SR_ST_INACTIVE;
 195
 196 }
 197
 198 static int get_channel_offsets(const struct sr_dev_inst *sdi)
 199 {
 200         struct dev_context *devc;
 201         struct sr_usb_dev_inst *usb;
 202         GString *gs;
 203         int chan, v, ret;
 204
 205         sr_dbg("Getting channel offsets.");
 206
 207         devc = sdi->priv;
 208         usb = sdi->conn;
 209
 210         ret = libusb_control_transfer(usb->devhdl,
 211                         LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_VENDOR,
 212                         CTRL_READ_EEPROM, EEPROM_CHANNEL_OFFSETS, 0,
 213                         (unsigned char *)&devc->channel_levels,
 214                         sizeof(devc->channel_levels), 200);
 215         if (ret != sizeof(devc->channel_levels)) {
 216                 sr_err("Failed to get channel offsets: %s.",
 217                        libusb_error_name(ret));
 218                 return SR_ERR;
 219         }
 220
 221         /* Comes in as 16-bit numbers with the second byte always 0 on
 222          * the DSO-2090. Guessing this is supposed to be big-endian,
 223          * since that's how voltage offsets are submitted back to the DSO.
 224          * Convert to host order now, so we can use them natively.
 225          */
 226         for (chan = 0; chan < NUM_CHANNELS; chan++) {
 227                 for (v = 0; v < 9; v++) {
 228                         devc->channel_levels[chan][v][0] =
 229                                 g_ntohs(devc->channel_levels[chan][v][0]);
 230                         devc->channel_levels[chan][v][1] =
 231                                 g_ntohs(devc->channel_levels[chan][v][1]);
 232                 }
 233         }
 234
 235         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 236                 gs = g_string_sized_new(128);
 237                 for (chan = 0; chan < NUM_CHANNELS; chan++) {
 238                         g_string_printf(gs, "CH%d:", chan + 1);
 239                         for (v = 0; v < 9; v++) {
 240                                 g_string_append_printf(gs, " %.4x-%.4x",
 241                                         devc->channel_levels[chan][v][0],
 242                                         devc->channel_levels[chan][v][1]);
 243                         }
 244                         sr_dbg("%s", gs->str);
 245                 }
 246                 g_string_free(gs, TRUE);
 247         }
 248
 249         return SR_OK;
 250 }
 251
 252 static int dso_set_trigger_samplerate(const struct sr_dev_inst *sdi)
 253 {
 254         struct dev_context *devc;
 255         struct sr_usb_dev_inst *usb;
 256         int ret, tmp;
 257         uint8_t cmdstring[12];
 258         uint16_t timebase_small[] = { 0xffff, 0xfffc, 0xfff7, 0xffe8, 0xffce,
 259                 0xff9c, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79, 0xd8f1 };
 260         uint16_t timebase_large[] = { 0xffff, 0x0000, 0xfffc, 0xfff7, 0xffe8,
 261                 0xffce, 0xff9d, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79 };
 262
 263         sr_dbg("Preparing CMD_SET_TRIGGER_SAMPLERATE.");
 264
 265         devc = sdi->priv;
 266         usb = sdi->conn;
 267
 268         memset(cmdstring, 0, sizeof(cmdstring));
 269         /* Command */
 270         cmdstring[0] = CMD_SET_TRIGGER_SAMPLERATE;
 271
 272         /* Trigger source */
 273         sr_dbg("Trigger source %s.", devc->triggersource);
 274         if (!strcmp("CH2", devc->triggersource))
 275                 tmp = 0;
 276         else if (!strcmp("CH1", devc->triggersource))
 277                 tmp = 1;
 278         else if (!strcmp("EXT", devc->triggersource))
 279                 tmp = 2;
 280         else {
 281                 sr_err("Invalid trigger source: '%s'.", devc->triggersource);
 282                 return SR_ERR_ARG;
 283         }
 284         cmdstring[2] = tmp;
 285
 286         /* Frame size */
 287         sr_dbg("Frame size: %d.", devc->framesize);
 288         cmdstring[2] |= (devc->framesize == FRAMESIZE_SMALL ? 0x01 : 0x02) << 2;
 289
 290         /* Timebase fast */
 291         sr_dbg("Time base index: %d.", devc->timebase);
 292         if (devc->framesize == FRAMESIZE_SMALL) {
 293                 if (devc->timebase < TIME_20us)
 294                         tmp = 0;
 295                 else if (devc->timebase == TIME_20us)
 296                         tmp = 1;
 297                 else if (devc->timebase == TIME_40us)
 298                         tmp = 2;
 299                 else if (devc->timebase == TIME_100us)
 300                         tmp = 3;
 301                 else if (devc->timebase >= TIME_200us)
 302                         tmp = 4;
 303         } else {
 304                 if (devc->timebase < TIME_40us) {
 305                         sr_err("Timebase < 40us only supported with 10K buffer.");
 306                         return SR_ERR_ARG;
 307                 }
 308                 else if (devc->timebase == TIME_40us)
 309                         tmp = 0;
 310                 else if (devc->timebase == TIME_100us)
 311                         tmp = 2;
 312                 else if (devc->timebase == TIME_200us)
 313                         tmp = 3;
 314                 else if (devc->timebase >= TIME_400us)
 315                         tmp = 4;
 316         }
 317         cmdstring[2] |= (tmp & 0x07) << 5;
 318
 319         /* Enabled channels: 00=CH1 01=CH2 10=both */
 320         sr_dbg("Channels CH1=%d CH2=%d", devc->ch1_enabled, devc->ch2_enabled);
 321         tmp = (((devc->ch2_enabled ? 1 : 0) << 1) + (devc->ch1_enabled ? 1 : 0)) - 1;
 322         cmdstring[3] = tmp;
 323
 324         /* Fast rates channel */
 325         /* TODO: Is this right? */
 326         tmp = devc->timebase < TIME_10us ? 1 : 0;
 327         cmdstring[3] |= tmp << 2;
 328
 329         /* Trigger slope: 0=positive 1=negative */
 330         /* TODO: Does this work? */
 331         sr_dbg("Trigger slope: %d.", devc->triggerslope);
 332         cmdstring[3] |= (devc->triggerslope == SLOPE_NEGATIVE ? 1 : 0) << 3;
 333
 334         /* Timebase slow */
 335         if (devc->timebase < TIME_100us)
 336                 tmp = 0;
 337         else if (devc->timebase > TIME_400ms)
 338                 tmp = 0xffed;
 339         else {
 340                 if (devc->framesize == FRAMESIZE_SMALL)
 341                         tmp = timebase_small[devc->timebase - 3];
 342                 else
 343                         tmp = timebase_large[devc->timebase - 3];
 344         }
 345         cmdstring[4] = tmp & 0xff;
 346         cmdstring[5] = (tmp >> 8) & 0xff;
 347
 348         /* Horizontal trigger position */
 349         sr_dbg("Trigger position: %3.2f.", devc->triggerposition);
 350         tmp = 0x77fff + 0x8000 * devc->triggerposition;
 351         cmdstring[6] = tmp & 0xff;
 352         cmdstring[7] = (tmp >> 8) & 0xff;
 353         cmdstring[10] = (tmp >> 16) & 0xff;
 354
 355         if (send_begin(sdi) != SR_OK)
 356                 return SR_ERR;
 357
 358         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 359                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 360                 sr_err("Failed to set trigger/samplerate: %s.",
 361                        libusb_error_name(ret));
 362                 return SR_ERR;
 363         }
 364         sr_dbg("Sent CMD_SET_TRIGGER_SAMPLERATE.");
 365
 366         return SR_OK;
 367 }
 368
 369 static int dso_set_filters(const struct sr_dev_inst *sdi)
 370 {
 371         struct dev_context *devc;
 372         struct sr_usb_dev_inst *usb;
 373         int ret, tmp;
 374         uint8_t cmdstring[8];
 375
 376         sr_dbg("Preparing CMD_SET_FILTERS.");
 377
 378         devc = sdi->priv;
 379         usb = sdi->conn;
 380
 381         memset(cmdstring, 0, sizeof(cmdstring));
 382         cmdstring[0] = CMD_SET_FILTERS;
 383         cmdstring[1] = 0x0f;
 384         if (devc->filter[0]) {
 385                 sr_dbg("Turning on CH1 filter.");
 386                 cmdstring[2] |= 0x80;
 387         }
 388         if (devc->filter[1]) {
 389                 sr_dbg("Turning on CH2 filter.");
 390                 cmdstring[2] |= 0x40;
 391         }
 392         /*
 393          * Not supported: filtering on the trigger
 394          * cmdstring[2] |= 0x20;
 395          */
 396
 397         if (send_begin(sdi) != SR_OK)
 398                 return SR_ERR;
 399
 400         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 401                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 402                 sr_err("Failed to set filters: %s.", libusb_error_name(ret));
 403                 return SR_ERR;
 404         }
 405         sr_dbg("Sent CMD_SET_FILTERS.");
 406
 407         return SR_OK;
 408 }
 409
 410 static int dso_set_voltage(const struct sr_dev_inst *sdi)
 411 {
 412         struct dev_context *devc;
 413         struct sr_usb_dev_inst *usb;
 414         int ret, tmp;
 415         uint8_t cmdstring[8];
 416
 417         sr_dbg("Preparing CMD_SET_VOLTAGE.");
 418
 419         devc = sdi->priv;
 420         usb = sdi->conn;
 421
 422         memset(cmdstring, 0, sizeof(cmdstring));
 423         cmdstring[0] = CMD_SET_VOLTAGE;
 424         cmdstring[1] = 0x0f;
 425         cmdstring[2] = 0x30;
 426
 427         /* CH1 volts/div is encoded in bits 0-1 */
 428         sr_dbg("CH1 vdiv index: %d.", devc->voltage[0]);
 429         switch (devc->voltage[0]) {
 430         case VDIV_1V:
 431         case VDIV_100MV:
 432         case VDIV_10MV:
 433                 cmdstring[2] |= 0x00;
 434                 break;
 435         case VDIV_2V:
 436         case VDIV_200MV:
 437         case VDIV_20MV:
 438                 cmdstring[2] |= 0x01;
 439                 break;
 440         case VDIV_5V:
 441         case VDIV_500MV:
 442         case VDIV_50MV:
 443                 cmdstring[2] |= 0x02;
 444                 break;
 445         }
 446
 447         /* CH2 volts/div is encoded in bits 2-3 */
 448         sr_dbg("CH2 vdiv index: %d.", devc->voltage[1]);
 449         switch (devc->voltage[1]) {
 450         case VDIV_1V:
 451         case VDIV_100MV:
 452         case VDIV_10MV:
 453                 cmdstring[2] |= 0x00;
 454                 break;
 455         case VDIV_2V:
 456         case VDIV_200MV:
 457         case VDIV_20MV:
 458                 cmdstring[2] |= 0x04;
 459                 break;
 460         case VDIV_5V:
 461         case VDIV_500MV:
 462         case VDIV_50MV:
 463                 cmdstring[2] |= 0x08;
 464                 break;
 465         }
 466
 467         if (send_begin(sdi) != SR_OK)
 468                 return SR_ERR;
 469
 470         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 471                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 472                 sr_err("Failed to set voltage: %s.", libusb_error_name(ret));
 473                 return SR_ERR;
 474         }
 475         sr_dbg("Sent CMD_SET_VOLTAGE.");
 476
 477         return SR_OK;
 478 }
 479
 480 static int dso_set_relays(const struct sr_dev_inst *sdi)
 481 {
 482         struct dev_context *devc;
 483         struct sr_usb_dev_inst *usb;
 484         GString *gs;
 485         int ret, i;
 486         uint8_t relays[17] = { 0x00, 0x04, 0x08, 0x02, 0x20, 0x40, 0x10, 0x01,
 487                         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 488
 489         sr_dbg("Preparing CTRL_SETRELAYS.");
 490
 491         devc = sdi->priv;
 492         usb = sdi->conn;
 493
 494         if (devc->voltage[0] < VDIV_1V)
 495                 relays[1] = ~relays[1];
 496
 497         if (devc->voltage[0] < VDIV_100MV)
 498                 relays[2] = ~relays[2];
 499
 500         sr_dbg("CH1 coupling: %d.", devc->coupling[0]);
 501         if (devc->coupling[0] != COUPLING_AC)
 502                 relays[3] = ~relays[3];
 503
 504         if (devc->voltage[1] < VDIV_1V)
 505                 relays[4] = ~relays[4];
 506
 507         if (devc->voltage[1] < VDIV_100MV)
 508                 relays[5] = ~relays[5];
 509
 510         sr_dbg("CH2 coupling: %d.", devc->coupling[1]);
 511         if (devc->coupling[1] != COUPLING_AC)
 512                 relays[6] = ~relays[6];
 513
 514         if (!strcmp(devc->triggersource, "EXT"))
 515                 relays[7] = ~relays[7];
 516
 517         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 518                 gs = g_string_sized_new(128);
 519                 g_string_printf(gs, "Relays:");
 520                 for (i = 0; i < 17; i++)
 521                         g_string_append_printf(gs, " %.2x", relays[i]);
 522                 sr_dbg("%s", gs->str);
 523                 g_string_free(gs, TRUE);
 524         }
 525
 526         if ((ret = libusb_control_transfer(usb->devhdl,
 527                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETRELAYS,
 528                         0, 0, relays, 17, 100)) != sizeof(relays)) {
 529                 sr_err("Failed to set relays: %s.", libusb_error_name(ret));
 530                 return SR_ERR;
 531         }
 532         sr_dbg("Sent CTRL_SETRELAYS.");
 533
 534         return SR_OK;
 535 }
 536
 537 static int dso_set_voffsets(const struct sr_dev_inst *sdi)
 538 {
 539         struct dev_context *devc;
 540         struct sr_usb_dev_inst *usb;
 541         int offset, ret;
 542         uint16_t *ch_levels;
 543         uint8_t offsets[17];
 544
 545         sr_dbg("Preparing CTRL_SETOFFSET.");
 546
 547         devc = sdi->priv;
 548         usb = sdi->conn;
 549
 550         memset(offsets, 0, sizeof(offsets));
 551         /* Channel 1 */
 552         ch_levels = devc->channel_levels[0][devc->voltage[0]];
 553         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch1 + ch_levels[0];
 554         offsets[0] = (offset >> 8) | 0x20;
 555         offsets[1] = offset & 0xff;
 556         sr_dbg("CH1 offset: %3.2f (%.2x%.2x).", devc->voffset_ch1,
 557                offsets[0], offsets[1]);
 558
 559         /* Channel 2 */
 560         ch_levels = devc->channel_levels[1][devc->voltage[1]];
 561         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch2 + ch_levels[0];
 562         offsets[2] = (offset >> 8) | 0x20;
 563         offsets[3] = offset & 0xff;
 564         sr_dbg("CH2 offset: %3.2f (%.2x%.2x).", devc->voffset_ch2,
 565                offsets[2], offsets[3]);
 566
 567         /* Trigger */
 568         offset = MAX_VERT_TRIGGER * devc->voffset_trigger;
 569         offsets[4] = (offset >> 8) | 0x20;
 570         offsets[5] = offset & 0xff;
 571         sr_dbg("Trigger offset: %3.2f (%.2x%.2x).", devc->voffset_trigger,
 572                         offsets[4], offsets[5]);
 573
 574         if ((ret = libusb_control_transfer(usb->devhdl,
 575                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETOFFSET,
 576                         0, 0, offsets, sizeof(offsets), 100)) != sizeof(offsets)) {
 577                 sr_err("Failed to set offsets: %s.", libusb_error_name(ret));
 578                 return SR_ERR;
 579         }
 580         sr_dbg("Sent CTRL_SETOFFSET.");
 581
 582         return SR_OK;
 583 }
 584
 585 SR_PRIV int dso_enable_trigger(const struct sr_dev_inst *sdi)
 586 {
 587         struct sr_usb_dev_inst *usb;
 588         int ret, tmp;
 589         uint8_t cmdstring[2];
 590
 591         sr_dbg("Sending CMD_ENABLE_TRIGGER.");
 592
 593         usb = sdi->conn;
 594
 595         memset(cmdstring, 0, sizeof(cmdstring));
 596         cmdstring[0] = CMD_ENABLE_TRIGGER;
 597         cmdstring[1] = 0x00;
 598
 599         if (send_begin(sdi) != SR_OK)
 600                 return SR_ERR;
 601
 602         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 603                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 604                 sr_err("Failed to enable trigger: %s.", libusb_error_name(ret));
 605                 return SR_ERR;
 606         }
 607
 608         return SR_OK;
 609 }
 610
 611 SR_PRIV int dso_force_trigger(const struct sr_dev_inst *sdi)
 612 {
 613         struct sr_usb_dev_inst *usb;
 614         int ret, tmp;
 615         uint8_t cmdstring[2];
 616
 617         sr_dbg("Sending CMD_FORCE_TRIGGER.");
 618
 619         usb = sdi->conn;
 620
 621         memset(cmdstring, 0, sizeof(cmdstring));
 622         cmdstring[0] = CMD_FORCE_TRIGGER;
 623         cmdstring[1] = 0x00;
 624
 625         if (send_begin(sdi) != SR_OK)
 626                 return SR_ERR;
 627
 628         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 629                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 630                 sr_err("Failed to force trigger: %s.", libusb_error_name(ret));
 631                 return SR_ERR;
 632         }
 633
 634         return SR_OK;
 635 }
 636
 637 SR_PRIV int dso_init(const struct sr_dev_inst *sdi)
 638 {
 639
 640         sr_dbg("Initializing DSO.");
 641
 642         if (get_channel_offsets(sdi) != SR_OK)
 643                 return SR_ERR;
 644
 645         if (dso_set_trigger_samplerate(sdi) != SR_OK)
 646                 return SR_ERR;
 647
 648         if (dso_set_filters(sdi) != SR_OK)
 649                 return SR_ERR;
 650
 651         if (dso_set_voltage(sdi) != SR_OK)
 652                 return SR_ERR;
 653
 654         if (dso_set_relays(sdi) != SR_OK)
 655                 return SR_ERR;
 656
 657         if (dso_set_voffsets(sdi) != SR_OK)
 658                 return SR_ERR;
 659
 660         if (dso_enable_trigger(sdi) != SR_OK)
 661                 return SR_ERR;
 662
 663         return SR_OK;
 664 }
 665
 666 SR_PRIV int dso_get_capturestate(const struct sr_dev_inst *sdi,
 667                 uint8_t *capturestate, uint32_t *trigger_offset)
 668 {
 669         struct sr_usb_dev_inst *usb;
 670         int ret, tmp, i;
 671         unsigned int bitvalue, toff;
 672         uint8_t cmdstring[2], inbuf[512];
 673
 674         sr_dbg("Sending CMD_GET_CAPTURESTATE.");
 675
 676         usb = sdi->conn;
 677
 678         cmdstring[0] = CMD_GET_CAPTURESTATE;
 679         cmdstring[1] = 0;
 680
 681         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 682                 sr_dbg("Failed to send get_capturestate command: %s.",
 683                        libusb_error_name(ret));
 684                 return SR_ERR;
 685         }
 686
 687         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_IN,
 688                         inbuf, 512, &tmp, 100)) != 0) {
 689                 sr_dbg("Failed to get capturestate: %s.",
 690                        libusb_error_name(ret));
 691                 return SR_ERR;
 692         }
 693         *capturestate = inbuf[0];
 694         toff = (inbuf[1] << 16) | (inbuf[3] << 8) | inbuf[2];
 695
 696         /*
 697          * This conversion comes from the openhantek project.
 698          * Each set bit in the 24-bit value inverts all bits with a lower
 699          * value. No idea why the device reports the trigger point this way.
 700          */
 701         bitvalue = 1;
 702         for (i = 0; i < 24; i++) {
 703                 /* Each set bit inverts all bits with a lower value. */
 704                 if (toff & bitvalue)
 705                         toff ^= bitvalue - 1;
 706                 bitvalue <<= 1;
 707         }
 708         *trigger_offset = toff;
 709
 710         return SR_OK;
 711 }
 712
 713 SR_PRIV int dso_capture_start(const struct sr_dev_inst *sdi)
 714 {
 715         int ret;
 716         uint8_t cmdstring[2];
 717
 718         sr_dbg("Sending CMD_CAPTURE_START.");
 719
 720         cmdstring[0] = CMD_CAPTURE_START;
 721         cmdstring[1] = 0;
 722
 723         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 724                 sr_err("Failed to send capture_start command: %s.",
 725                        libusb_error_name(ret));
 726                 return SR_ERR;
 727         }
 728
 729         return SR_OK;
 730 }
 731
 732 SR_PRIV int dso_get_channeldata(const struct sr_dev_inst *sdi,
 733                 libusb_transfer_cb_fn cb)
 734 {
 735         struct dev_context *devc;
 736         struct sr_usb_dev_inst *usb;
 737         struct libusb_transfer *transfer;
 738         int num_transfers, ret, i;
 739         uint8_t cmdstring[2];
 740         unsigned char *buf;
 741
 742         sr_dbg("Sending CMD_GET_CHANNELDATA.");
 743
 744         devc = sdi->priv;
 745         usb = sdi->conn;
 746
 747         cmdstring[0] = CMD_GET_CHANNELDATA;
 748         cmdstring[1] = 0;
 749
 750         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 751                 sr_err("Failed to get channel data: %s.",
 752                        libusb_error_name(ret));
 753                 return SR_ERR;
 754         }
 755
 756         /* TODO: DSO-2xxx only. */
 757         num_transfers = devc->framesize *
 758                         sizeof(unsigned short) / devc->epin_maxpacketsize;
 759         sr_dbg("Queueing up %d transfers.", num_transfers);
 760         for (i = 0; i < num_transfers; i++) {
 761                 if (!(buf = g_try_malloc(devc->epin_maxpacketsize))) {
 762                         sr_err("Failed to malloc USB endpoint buffer.");
 763                         return SR_ERR_MALLOC;
 764                 }
 765                 transfer = libusb_alloc_transfer(0);
 766                 libusb_fill_bulk_transfer(transfer, usb->devhdl, DSO_EP_IN, buf,
 767                                 devc->epin_maxpacketsize, cb, (void *)sdi, 40);
 768                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 769                         sr_err("Failed to submit transfer: %s.",
 770                                libusb_error_name(ret));
 771                         /* TODO: Free them all. */
 772                         libusb_free_transfer(transfer);
 773                         g_free(buf);
 774                         return SR_ERR;
 775                 }
 776         }
 777
 778         return SR_OK;
 779 }