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 "libsigrok.h"
  23 #include "libsigrok-internal.h"
  24 #include "dso.h"
  25 #include <string.h>
  26 #include <glib.h>
  27 #include <libusb.h>
  28
  29 extern struct sr_dev_driver hantek_dso_driver_info;
  30
  31 static int send_begin(const struct sr_dev_inst *sdi)
  32 {
  33         struct sr_usb_dev_inst *usb;
  34         int ret;
  35         unsigned char buffer[] = {0x0f, 0x03, 0x03, 0x03, 0x68, 0xac, 0xfe,
  36         0x00, 0x01, 0x00};
  37
  38         sr_dbg("Sending CTRL_BEGINCOMMAND.");
  39
  40         usb = sdi->conn;
  41         if ((ret = libusb_control_transfer(usb->devhdl,
  42                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_BEGINCOMMAND,
  43                         0, 0, buffer, sizeof(buffer), 200)) != sizeof(buffer)) {
  44                 sr_err("Failed to send begincommand: %s.",
  45                        libusb_error_name(ret));
  46                 return SR_ERR;
  47         }
  48
  49         return SR_OK;
  50 }
  51
  52 static int send_bulkcmd(const struct sr_dev_inst *sdi, uint8_t *cmdstring, int cmdlen)
  53 {
  54         struct sr_usb_dev_inst *usb;
  55         int ret, tmp;
  56
  57         usb = sdi->conn;
  58
  59         if (send_begin(sdi) != SR_OK)
  60                 return SR_ERR;
  61
  62         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT, cmdstring,
  63                         cmdlen, &tmp, 200)) != 0)
  64                 return SR_ERR;
  65
  66         return SR_OK;
  67 }
  68
  69 static int dso_getmps(libusb_device *dev)
  70 {
  71         struct libusb_device_descriptor des;
  72         struct libusb_config_descriptor *conf_dsc;
  73         const struct libusb_interface_descriptor *intf_dsc;
  74         int mps;
  75
  76         if (libusb_get_device_descriptor(dev, &des) != 0)
  77                 return 0;
  78
  79         if (des.bNumConfigurations != 1)
  80                 return 0;
  81
  82         if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
  83                 return 0;
  84
  85         mps = 0;
  86         intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
  87         if (intf_dsc->bNumEndpoints != 2)
  88                 goto err;
  89
  90         if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
  91             (2 | LIBUSB_ENDPOINT_OUT))
  92                 /* The first endpoint should be 2 (outbound). */
  93                 goto err;
  94
  95         if ((intf_dsc->endpoint[1].bEndpointAddress & 0x8f) !=
  96             (6 | LIBUSB_ENDPOINT_IN))
  97                 /* The second endpoint should be 6 (inbound). */
  98                 goto err;
  99
 100         mps = intf_dsc->endpoint[1].wMaxPacketSize;
 101
 102 err:
 103         if (conf_dsc)
 104                 libusb_free_config_descriptor(conf_dsc);
 105
 106         return mps;
 107 }
 108
 109 SR_PRIV int dso_open(struct sr_dev_inst *sdi)
 110 {
 111         struct dev_context *devc;
 112         struct drv_context *drvc = hantek_dso_driver_info.priv;
 113         struct sr_usb_dev_inst *usb;
 114         struct libusb_device_descriptor des;
 115         libusb_device **devlist;
 116         int err, i;
 117         char connection_id[64];
 118
 119         devc = sdi->priv;
 120         usb = sdi->conn;
 121
 122         if (sdi->status == SR_ST_ACTIVE)
 123                 /* already in use */
 124                 return SR_ERR;
 125
 126         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 127         for (i = 0; devlist[i]; i++) {
 128                 if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
 129                         sr_err("Failed to get device descriptor: %s.",
 130                                libusb_error_name(err));
 131                         continue;
 132                 }
 133
 134                 if (des.idVendor != devc->profile->fw_vid
 135                     || des.idProduct != devc->profile->fw_pid)
 136                         continue;
 137
 138                 if ((sdi->status == SR_ST_INITIALIZING) ||
 139                                 (sdi->status == SR_ST_INACTIVE)) {
 140                         /*
 141                          * Check device by its physical USB bus/port address.
 142                          */
 143                         usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 144                         if (strcmp(sdi->connection_id, connection_id))
 145                                 /* This is not the one. */
 146                                 continue;
 147                 }
 148
 149                 if (!(err = libusb_open(devlist[i], &usb->devhdl))) {
 150                         if (usb->address == 0xff)
 151                                 /*
 152                                  * first time we touch this device after firmware upload,
 153                                  * so we don't know the address yet.
 154                                  */
 155                                 usb->address = libusb_get_device_address(devlist[i]);
 156
 157                         if (!(devc->epin_maxpacketsize = dso_getmps(devlist[i])))
 158                                 sr_err("Wrong endpoint profile.");
 159                         else {
 160                                 sdi->status = SR_ST_ACTIVE;
 161                                 sr_info("Opened device on %d.%d (logical) / "
 162                                                 "%s (physical) interface %d.",
 163                                         usb->bus, usb->address,
 164                                         sdi->connection_id, USB_INTERFACE);
 165                         }
 166                 } else {
 167                         sr_err("Failed to open device: %s.",
 168                                libusb_error_name(err));
 169                 }
 170
 171                 /* If we made it here, we handled the device (somehow). */
 172                 break;
 173         }
 174         libusb_free_device_list(devlist, 1);
 175
 176         if (sdi->status != SR_ST_ACTIVE)
 177                 return SR_ERR;
 178
 179         return SR_OK;
 180 }
 181
 182 SR_PRIV void dso_close(struct sr_dev_inst *sdi)
 183 {
 184         struct sr_usb_dev_inst *usb;
 185
 186         usb = sdi->conn;
 187
 188         if (usb->devhdl == NULL)
 189                 return;
 190
 191         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 192                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 193         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 194         libusb_close(usb->devhdl);
 195         usb->devhdl = NULL;
 196         sdi->status = SR_ST_INACTIVE;
 197
 198 }
 199
 200 static int get_channel_offsets(const struct sr_dev_inst *sdi)
 201 {
 202         struct dev_context *devc;
 203         struct sr_usb_dev_inst *usb;
 204         GString *gs;
 205         int chan, v, ret;
 206
 207         sr_dbg("Getting channel offsets.");
 208
 209         devc = sdi->priv;
 210         usb = sdi->conn;
 211
 212         ret = libusb_control_transfer(usb->devhdl,
 213                         LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_VENDOR,
 214                         CTRL_READ_EEPROM, EEPROM_CHANNEL_OFFSETS, 0,
 215                         (unsigned char *)&devc->channel_levels,
 216                         sizeof(devc->channel_levels), 200);
 217         if (ret != sizeof(devc->channel_levels)) {
 218                 sr_err("Failed to get channel offsets: %s.",
 219                        libusb_error_name(ret));
 220                 return SR_ERR;
 221         }
 222
 223         /* Comes in as 16-bit numbers with the second byte always 0 on
 224          * the DSO-2090. Guessing this is supposed to be big-endian,
 225          * since that's how voltage offsets are submitted back to the DSO.
 226          * Convert to host order now, so we can use them natively.
 227          */
 228         for (chan = 0; chan < 2; chan++) {
 229                 for (v = 0; v < 9; v++) {
 230                         devc->channel_levels[chan][v][0] =
 231                                 g_ntohs(devc->channel_levels[chan][v][0]);
 232                         devc->channel_levels[chan][v][1] =
 233                                 g_ntohs(devc->channel_levels[chan][v][1]);
 234                 }
 235         }
 236
 237         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 238                 gs = g_string_sized_new(128);
 239                 for (chan = 0; chan < 2; chan++) {
 240                         g_string_printf(gs, "CH%d:", chan + 1);
 241                         for (v = 0; v < 9; v++) {
 242                                 g_string_append_printf(gs, " %.4x-%.4x",
 243                                         devc->channel_levels[chan][v][0],
 244                                         devc->channel_levels[chan][v][1]);
 245                         }
 246                         sr_dbg("%s", gs->str);
 247                 }
 248                 g_string_free(gs, TRUE);
 249         }
 250
 251         return SR_OK;
 252 }
 253
 254 static int dso_set_trigger_samplerate(const struct sr_dev_inst *sdi)
 255 {
 256         struct dev_context *devc;
 257         struct sr_usb_dev_inst *usb;
 258         int ret, tmp;
 259         uint8_t cmdstring[12];
 260         uint16_t timebase_small[] = { 0xffff, 0xfffc, 0xfff7, 0xffe8, 0xffce,
 261                 0xff9c, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79, 0xd8f1 };
 262         uint16_t timebase_large[] = { 0xffff, 0x0000, 0xfffc, 0xfff7, 0xffe8,
 263                 0xffce, 0xff9d, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79 };
 264
 265         sr_dbg("Preparing CMD_SET_TRIGGER_SAMPLERATE.");
 266
 267         devc = sdi->priv;
 268         usb = sdi->conn;
 269
 270         memset(cmdstring, 0, sizeof(cmdstring));
 271         /* Command */
 272         cmdstring[0] = CMD_SET_TRIGGER_SAMPLERATE;
 273
 274         /* Trigger source */
 275         sr_dbg("Trigger source %s.", devc->triggersource);
 276         if (!strcmp("CH2", devc->triggersource))
 277                 tmp = 0;
 278         else if (!strcmp("CH1", devc->triggersource))
 279                 tmp = 1;
 280         else if (!strcmp("EXT", devc->triggersource))
 281                 tmp = 2;
 282         else {
 283                 sr_err("Invalid trigger source: '%s'.", devc->triggersource);
 284                 return SR_ERR_ARG;
 285         }
 286         cmdstring[2] = tmp;
 287
 288         /* Frame size */
 289         sr_dbg("Frame size: %d.", devc->framesize);
 290         cmdstring[2] |= (devc->framesize == FRAMESIZE_SMALL ? 0x01 : 0x02) << 2;
 291
 292         /* Timebase fast */
 293         sr_dbg("Time base index: %d.", devc->timebase);
 294         if (devc->framesize == FRAMESIZE_SMALL) {
 295                 if (devc->timebase < TIME_20us)
 296                         tmp = 0;
 297                 else if (devc->timebase == TIME_20us)
 298                         tmp = 1;
 299                 else if (devc->timebase == TIME_40us)
 300                         tmp = 2;
 301                 else if (devc->timebase == TIME_100us)
 302                         tmp = 3;
 303                 else if (devc->timebase >= TIME_200us)
 304                         tmp = 4;
 305         } else {
 306                 if (devc->timebase < TIME_40us) {
 307                         sr_err("Timebase < 40us only supported with 10K buffer.");
 308                         return SR_ERR_ARG;
 309                 }
 310                 else if (devc->timebase == TIME_40us)
 311                         tmp = 0;
 312                 else if (devc->timebase == TIME_100us)
 313                         tmp = 2;
 314                 else if (devc->timebase == TIME_200us)
 315                         tmp = 3;
 316                 else if (devc->timebase >= TIME_400us)
 317                         tmp = 4;
 318         }
 319         cmdstring[2] |= (tmp & 0x07) << 5;
 320
 321         /* Enabled channels: 00=CH1 01=CH2 10=both */
 322         sr_dbg("Channels CH1=%d CH2=%d", devc->ch1_enabled, devc->ch2_enabled);
 323         tmp = (((devc->ch2_enabled ? 1 : 0) << 1) + (devc->ch1_enabled ? 1 : 0)) - 1;
 324         cmdstring[3] = tmp;
 325
 326         /* Fast rates channel */
 327         /* TODO: Is this right? */
 328         tmp = devc->timebase < TIME_10us ? 1 : 0;
 329         cmdstring[3] |= tmp << 2;
 330
 331         /* Trigger slope: 0=positive 1=negative */
 332         /* TODO: Does this work? */
 333         sr_dbg("Trigger slope: %d.", devc->triggerslope);
 334         cmdstring[3] |= (devc->triggerslope == SLOPE_NEGATIVE ? 1 : 0) << 3;
 335
 336         /* Timebase slow */
 337         if (devc->timebase < TIME_100us)
 338                 tmp = 0;
 339         else if (devc->timebase > TIME_400ms)
 340                 tmp = 0xffed;
 341         else {
 342                 if (devc->framesize == FRAMESIZE_SMALL)
 343                         tmp = timebase_small[devc->timebase - 3];
 344                 else
 345                         tmp = timebase_large[devc->timebase - 3];
 346         }
 347         cmdstring[4] = tmp & 0xff;
 348         cmdstring[5] = (tmp >> 8) & 0xff;
 349
 350         /* Horizontal trigger position */
 351         sr_dbg("Trigger position: %3.2f.", devc->triggerposition);
 352         tmp = 0x77fff + 0x8000 * devc->triggerposition;
 353         cmdstring[6] = tmp & 0xff;
 354         cmdstring[7] = (tmp >> 8) & 0xff;
 355         cmdstring[10] = (tmp >> 16) & 0xff;
 356
 357         if (send_begin(sdi) != SR_OK)
 358                 return SR_ERR;
 359
 360         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 361                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 362                 sr_err("Failed to set trigger/samplerate: %s.",
 363                        libusb_error_name(ret));
 364                 return SR_ERR;
 365         }
 366         sr_dbg("Sent CMD_SET_TRIGGER_SAMPLERATE.");
 367
 368         return SR_OK;
 369 }
 370
 371 static int dso_set_filters(const struct sr_dev_inst *sdi)
 372 {
 373         struct dev_context *devc;
 374         struct sr_usb_dev_inst *usb;
 375         int ret, tmp;
 376         uint8_t cmdstring[8];
 377
 378         sr_dbg("Preparing CMD_SET_FILTERS.");
 379
 380         devc = sdi->priv;
 381         usb = sdi->conn;
 382
 383         memset(cmdstring, 0, sizeof(cmdstring));
 384         cmdstring[0] = CMD_SET_FILTERS;
 385         cmdstring[1] = 0x0f;
 386         if (devc->filter[0]) {
 387                 sr_dbg("Turning on CH1 filter.");
 388                 cmdstring[2] |= 0x80;
 389         }
 390         if (devc->filter[1]) {
 391                 sr_dbg("Turning on CH2 filter.");
 392                 cmdstring[2] |= 0x40;
 393         }
 394         /*
 395          * Not supported: filtering on the trigger
 396          * cmdstring[2] |= 0x20;
 397          */
 398
 399         if (send_begin(sdi) != SR_OK)
 400                 return SR_ERR;
 401
 402         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 403                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 404                 sr_err("Failed to set filters: %s.", libusb_error_name(ret));
 405                 return SR_ERR;
 406         }
 407         sr_dbg("Sent CMD_SET_FILTERS.");
 408
 409         return SR_OK;
 410 }
 411
 412 static int dso_set_voltage(const struct sr_dev_inst *sdi)
 413 {
 414         struct dev_context *devc;
 415         struct sr_usb_dev_inst *usb;
 416         int ret, tmp;
 417         uint8_t cmdstring[8];
 418
 419         sr_dbg("Preparing CMD_SET_VOLTAGE.");
 420
 421         devc = sdi->priv;
 422         usb = sdi->conn;
 423
 424         memset(cmdstring, 0, sizeof(cmdstring));
 425         cmdstring[0] = CMD_SET_VOLTAGE;
 426         cmdstring[1] = 0x0f;
 427         cmdstring[2] = 0x30;
 428
 429         /* CH1 volts/div is encoded in bits 0-1 */
 430         sr_dbg("CH1 vdiv index: %d.", devc->voltage[0]);
 431         switch (devc->voltage[0]) {
 432         case VDIV_1V:
 433         case VDIV_100MV:
 434         case VDIV_10MV:
 435                 cmdstring[2] |= 0x00;
 436                 break;
 437         case VDIV_2V:
 438         case VDIV_200MV:
 439         case VDIV_20MV:
 440                 cmdstring[2] |= 0x01;
 441                 break;
 442         case VDIV_5V:
 443         case VDIV_500MV:
 444         case VDIV_50MV:
 445                 cmdstring[2] |= 0x02;
 446                 break;
 447         }
 448
 449         /* CH2 volts/div is encoded in bits 2-3 */
 450         sr_dbg("CH2 vdiv index: %d.", devc->voltage[1]);
 451         switch (devc->voltage[1]) {
 452         case VDIV_1V:
 453         case VDIV_100MV:
 454         case VDIV_10MV:
 455                 cmdstring[2] |= 0x00;
 456                 break;
 457         case VDIV_2V:
 458         case VDIV_200MV:
 459         case VDIV_20MV:
 460                 cmdstring[2] |= 0x04;
 461                 break;
 462         case VDIV_5V:
 463         case VDIV_500MV:
 464         case VDIV_50MV:
 465                 cmdstring[2] |= 0x08;
 466                 break;
 467         }
 468
 469         if (send_begin(sdi) != SR_OK)
 470                 return SR_ERR;
 471
 472         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 473                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 474                 sr_err("Failed to set voltage: %s.", libusb_error_name(ret));
 475                 return SR_ERR;
 476         }
 477         sr_dbg("Sent CMD_SET_VOLTAGE.");
 478
 479         return SR_OK;
 480 }
 481
 482 static int dso_set_relays(const struct sr_dev_inst *sdi)
 483 {
 484         struct dev_context *devc;
 485         struct sr_usb_dev_inst *usb;
 486         GString *gs;
 487         int ret, i;
 488         uint8_t relays[17] = { 0x00, 0x04, 0x08, 0x02, 0x20, 0x40, 0x10, 0x01,
 489                         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 490
 491         sr_dbg("Preparing CTRL_SETRELAYS.");
 492
 493         devc = sdi->priv;
 494         usb = sdi->conn;
 495
 496         if (devc->voltage[0] < VDIV_1V)
 497                 relays[1] = ~relays[1];
 498
 499         if (devc->voltage[0] < VDIV_100MV)
 500                 relays[2] = ~relays[2];
 501
 502         sr_dbg("CH1 coupling: %d.", devc->coupling[0]);
 503         if (devc->coupling[0] != COUPLING_AC)
 504                 relays[3] = ~relays[3];
 505
 506         if (devc->voltage[1] < VDIV_1V)
 507                 relays[4] = ~relays[4];
 508
 509         if (devc->voltage[1] < VDIV_100MV)
 510                 relays[5] = ~relays[5];
 511
 512         sr_dbg("CH2 coupling: %d.", devc->coupling[1]);
 513         if (devc->coupling[1] != COUPLING_AC)
 514                 relays[6] = ~relays[6];
 515
 516         if (!strcmp(devc->triggersource, "EXT"))
 517                 relays[7] = ~relays[7];
 518
 519         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 520                 gs = g_string_sized_new(128);
 521                 g_string_printf(gs, "Relays:");
 522                 for (i = 0; i < 17; i++)
 523                         g_string_append_printf(gs, " %.2x", relays[i]);
 524                 sr_dbg("%s", gs->str);
 525                 g_string_free(gs, TRUE);
 526         }
 527
 528         if ((ret = libusb_control_transfer(usb->devhdl,
 529                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETRELAYS,
 530                         0, 0, relays, 17, 100)) != sizeof(relays)) {
 531                 sr_err("Failed to set relays: %s.", libusb_error_name(ret));
 532                 return SR_ERR;
 533         }
 534         sr_dbg("Sent CTRL_SETRELAYS.");
 535
 536         return SR_OK;
 537 }
 538
 539 static int dso_set_voffsets(const struct sr_dev_inst *sdi)
 540 {
 541         struct dev_context *devc;
 542         struct sr_usb_dev_inst *usb;
 543         int offset, ret;
 544         uint16_t *ch_levels;
 545         uint8_t offsets[17];
 546
 547         sr_dbg("Preparing CTRL_SETOFFSET.");
 548
 549         devc = sdi->priv;
 550         usb = sdi->conn;
 551
 552         memset(offsets, 0, sizeof(offsets));
 553         /* Channel 1 */
 554         ch_levels = devc->channel_levels[0][devc->voltage[0]];
 555         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch1 + ch_levels[0];
 556         offsets[0] = (offset >> 8) | 0x20;
 557         offsets[1] = offset & 0xff;
 558         sr_dbg("CH1 offset: %3.2f (%.2x%.2x).", devc->voffset_ch1,
 559                offsets[0], offsets[1]);
 560
 561         /* Channel 2 */
 562         ch_levels = devc->channel_levels[1][devc->voltage[1]];
 563         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch2 + ch_levels[0];
 564         offsets[2] = (offset >> 8) | 0x20;
 565         offsets[3] = offset & 0xff;
 566         sr_dbg("CH2 offset: %3.2f (%.2x%.2x).", devc->voffset_ch2,
 567                offsets[2], offsets[3]);
 568
 569         /* Trigger */
 570         offset = MAX_VERT_TRIGGER * devc->voffset_trigger;
 571         offsets[4] = (offset >> 8) | 0x20;
 572         offsets[5] = offset & 0xff;
 573         sr_dbg("Trigger offset: %3.2f (%.2x%.2x).", devc->voffset_trigger,
 574                         offsets[4], offsets[5]);
 575
 576         if ((ret = libusb_control_transfer(usb->devhdl,
 577                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETOFFSET,
 578                         0, 0, offsets, sizeof(offsets), 100)) != sizeof(offsets)) {
 579                 sr_err("Failed to set offsets: %s.", libusb_error_name(ret));
 580                 return SR_ERR;
 581         }
 582         sr_dbg("Sent CTRL_SETOFFSET.");
 583
 584         return SR_OK;
 585 }
 586
 587 SR_PRIV int dso_enable_trigger(const struct sr_dev_inst *sdi)
 588 {
 589         struct sr_usb_dev_inst *usb;
 590         int ret, tmp;
 591         uint8_t cmdstring[2];
 592
 593         sr_dbg("Sending CMD_ENABLE_TRIGGER.");
 594
 595         usb = sdi->conn;
 596
 597         memset(cmdstring, 0, sizeof(cmdstring));
 598         cmdstring[0] = CMD_ENABLE_TRIGGER;
 599         cmdstring[1] = 0x00;
 600
 601         if (send_begin(sdi) != SR_OK)
 602                 return SR_ERR;
 603
 604         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 605                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 606                 sr_err("Failed to enable trigger: %s.", libusb_error_name(ret));
 607                 return SR_ERR;
 608         }
 609
 610         return SR_OK;
 611 }
 612
 613 SR_PRIV int dso_force_trigger(const struct sr_dev_inst *sdi)
 614 {
 615         struct sr_usb_dev_inst *usb;
 616         int ret, tmp;
 617         uint8_t cmdstring[2];
 618
 619         sr_dbg("Sending CMD_FORCE_TRIGGER.");
 620
 621         usb = sdi->conn;
 622
 623         memset(cmdstring, 0, sizeof(cmdstring));
 624         cmdstring[0] = CMD_FORCE_TRIGGER;
 625         cmdstring[1] = 0x00;
 626
 627         if (send_begin(sdi) != SR_OK)
 628                 return SR_ERR;
 629
 630         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 631                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 632                 sr_err("Failed to force trigger: %s.", libusb_error_name(ret));
 633                 return SR_ERR;
 634         }
 635
 636         return SR_OK;
 637 }
 638
 639 SR_PRIV int dso_init(const struct sr_dev_inst *sdi)
 640 {
 641
 642         sr_dbg("Initializing DSO.");
 643
 644         if (get_channel_offsets(sdi) != SR_OK)
 645                 return SR_ERR;
 646
 647         if (dso_set_trigger_samplerate(sdi) != SR_OK)
 648                 return SR_ERR;
 649
 650         if (dso_set_filters(sdi) != SR_OK)
 651                 return SR_ERR;
 652
 653         if (dso_set_voltage(sdi) != SR_OK)
 654                 return SR_ERR;
 655
 656         if (dso_set_relays(sdi) != SR_OK)
 657                 return SR_ERR;
 658
 659         if (dso_set_voffsets(sdi) != SR_OK)
 660                 return SR_ERR;
 661
 662         if (dso_enable_trigger(sdi) != SR_OK)
 663                 return SR_ERR;
 664
 665         return SR_OK;
 666 }
 667
 668 SR_PRIV int dso_get_capturestate(const struct sr_dev_inst *sdi,
 669                 uint8_t *capturestate, uint32_t *trigger_offset)
 670 {
 671         struct sr_usb_dev_inst *usb;
 672         int ret, tmp, i;
 673         unsigned int bitvalue, toff;
 674         uint8_t cmdstring[2], inbuf[512];
 675
 676         sr_dbg("Sending CMD_GET_CAPTURESTATE.");
 677
 678         usb = sdi->conn;
 679
 680         cmdstring[0] = CMD_GET_CAPTURESTATE;
 681         cmdstring[1] = 0;
 682
 683         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 684                 sr_dbg("Failed to send get_capturestate command: %s.",
 685                        libusb_error_name(ret));
 686                 return SR_ERR;
 687         }
 688
 689         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_IN,
 690                         inbuf, 512, &tmp, 100)) != 0) {
 691                 sr_dbg("Failed to get capturestate: %s.",
 692                        libusb_error_name(ret));
 693                 return SR_ERR;
 694         }
 695         *capturestate = inbuf[0];
 696         toff = (inbuf[1] << 16) | (inbuf[3] << 8) | inbuf[2];
 697
 698         /*
 699          * This conversion comes from the openhantek project.
 700          * Each set bit in the 24-bit value inverts all bits with a lower
 701          * value. No idea why the device reports the trigger point this way.
 702          */
 703         bitvalue = 1;
 704         for (i = 0; i < 24; i++) {
 705                 /* Each set bit inverts all bits with a lower value. */
 706                 if (toff & bitvalue)
 707                         toff ^= bitvalue - 1;
 708                 bitvalue <<= 1;
 709         }
 710         *trigger_offset = toff;
 711
 712         return SR_OK;
 713 }
 714
 715 SR_PRIV int dso_capture_start(const struct sr_dev_inst *sdi)
 716 {
 717         int ret;
 718         uint8_t cmdstring[2];
 719
 720         sr_dbg("Sending CMD_CAPTURE_START.");
 721
 722         cmdstring[0] = CMD_CAPTURE_START;
 723         cmdstring[1] = 0;
 724
 725         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 726                 sr_err("Failed to send capture_start command: %s.",
 727                        libusb_error_name(ret));
 728                 return SR_ERR;
 729         }
 730
 731         return SR_OK;
 732 }
 733
 734 SR_PRIV int dso_get_channeldata(const struct sr_dev_inst *sdi,
 735                 libusb_transfer_cb_fn cb)
 736 {
 737         struct dev_context *devc;
 738         struct sr_usb_dev_inst *usb;
 739         struct libusb_transfer *transfer;
 740         int num_transfers, ret, i;
 741         uint8_t cmdstring[2];
 742         unsigned char *buf;
 743
 744         sr_dbg("Sending CMD_GET_CHANNELDATA.");
 745
 746         devc = sdi->priv;
 747         usb = sdi->conn;
 748
 749         cmdstring[0] = CMD_GET_CHANNELDATA;
 750         cmdstring[1] = 0;
 751
 752         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 753                 sr_err("Failed to get channel data: %s.",
 754                        libusb_error_name(ret));
 755                 return SR_ERR;
 756         }
 757
 758         /* TODO: DSO-2xxx only. */
 759         num_transfers = devc->framesize *
 760                         sizeof(unsigned short) / devc->epin_maxpacketsize;
 761         sr_dbg("Queueing up %d transfers.", num_transfers);
 762         for (i = 0; i < num_transfers; i++) {
 763                 if (!(buf = g_try_malloc(devc->epin_maxpacketsize))) {
 764                         sr_err("Failed to malloc USB endpoint buffer.");
 765                         return SR_ERR_MALLOC;
 766                 }
 767                 transfer = libusb_alloc_transfer(0);
 768                 libusb_fill_bulk_transfer(transfer, usb->devhdl, DSO_EP_IN, buf,
 769                                 devc->epin_maxpacketsize, cb, (void *)sdi, 40);
 770                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 771                         sr_err("Failed to submit transfer: %s.",
 772                                libusb_error_name(ret));
 773                         /* TODO: Free them all. */
 774                         libusb_free_transfer(transfer);
 775                         g_free(buf);
 776                         return SR_ERR;
 777                 }
 778         }
 779
 780         return SR_OK;
 781 }