hardware/hantek-dso/dso.c

   1 /*
   2  * This file is part of the sigrok 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(struct dev_context *devc)
  32 {
  33         int ret;
  34         unsigned char buffer[] = {0x0f, 0x03, 0x03, 0x03, 0x68, 0xac, 0xfe,
  35         0x00, 0x01, 0x00};
  36
  37         sr_dbg("Sending CTRL_BEGINCOMMAND.");
  38
  39         if ((ret = libusb_control_transfer(devc->usb->devhdl,
  40                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_BEGINCOMMAND,
  41                         0, 0, buffer, sizeof(buffer), 200)) != sizeof(buffer)) {
  42                 sr_err("Failed to send begincommand: %d.", ret);
  43                 return SR_ERR;
  44         }
  45
  46         return SR_OK;
  47 }
  48
  49 static int send_bulkcmd(struct dev_context *devc, uint8_t *cmdstring, int cmdlen)
  50 {
  51         int ret, tmp;
  52
  53         if (send_begin(devc) != SR_OK)
  54                 return SR_ERR;
  55
  56         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
  57                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
  58                         cmdstring, cmdlen, &tmp, 200)) != 0)
  59                 return SR_ERR;
  60
  61         return SR_OK;
  62 }
  63
  64 SR_PRIV int dso_getmps(libusb_device *dev)
  65 {
  66         struct libusb_device_descriptor des;
  67         struct libusb_config_descriptor *conf_dsc;
  68         const struct libusb_interface_descriptor *intf_dsc;
  69         int mps;
  70
  71         if (libusb_get_device_descriptor(dev, &des) != 0)
  72                 return 0;
  73
  74         if (des.bNumConfigurations != 1)
  75                 return 0;
  76
  77         if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
  78                 return 0;
  79
  80         mps = 0;
  81         intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
  82         if (intf_dsc->bNumEndpoints != 2)
  83                 goto err;
  84
  85         if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
  86             (2 | LIBUSB_ENDPOINT_OUT))
  87                 /* The first endpoint should be 2 (outbound). */
  88                 goto err;
  89
  90         if ((intf_dsc->endpoint[1].bEndpointAddress & 0x8f) !=
  91             (6 | LIBUSB_ENDPOINT_IN))
  92                 /* The second endpoint should be 6 (inbound). */
  93                 goto err;
  94
  95         mps = intf_dsc->endpoint[1].wMaxPacketSize;
  96
  97 err:
  98         if (conf_dsc)
  99                 libusb_free_config_descriptor(conf_dsc);
 100
 101         return mps;
 102 }
 103
 104 SR_PRIV int dso_open(struct sr_dev_inst *sdi)
 105 {
 106         libusb_device **devlist;
 107         struct libusb_device_descriptor des;
 108         struct dev_context *devc;
 109         int err, skip, i;
 110
 111         devc = sdi->priv;
 112
 113         if (sdi->status == SR_ST_ACTIVE)
 114                 /* already in use */
 115                 return SR_ERR;
 116
 117         skip = 0;
 118         libusb_get_device_list(NULL, &devlist);
 119         for (i = 0; devlist[i]; i++) {
 120                 if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
 121                         sr_err("Failed to get device descriptor: %d.", err);
 122                         continue;
 123                 }
 124
 125                 if (des.idVendor != devc->profile->fw_vid
 126                     || des.idProduct != devc->profile->fw_pid)
 127                         continue;
 128
 129                 if (sdi->status == SR_ST_INITIALIZING) {
 130                         if (skip != sdi->index) {
 131                                 /* Skip devices of this type that aren't the one we want. */
 132                                 skip += 1;
 133                                 continue;
 134                         }
 135                 } else if (sdi->status == SR_ST_INACTIVE) {
 136                         /*
 137                          * This device is fully enumerated, so we need to find
 138                          * this device by vendor, product, bus and address.
 139                          */
 140                         if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
 141                                 || libusb_get_device_address(devlist[i]) != devc->usb->address)
 142                                 /* this is not the one */
 143                                 continue;
 144                 }
 145
 146                 if (!(err = libusb_open(devlist[i], &devc->usb->devhdl))) {
 147                         if (devc->usb->address == 0xff)
 148                                 /*
 149                                  * first time we touch this device after firmware upload,
 150                                  * so we don't know the address yet.
 151                                  */
 152                                 devc->usb->address = libusb_get_device_address(devlist[i]);
 153
 154                         if (!(devc->epin_maxpacketsize = dso_getmps(devlist[i])))
 155                                 sr_err("Wrong endpoint profile.");
 156                         else {
 157                                 sdi->status = SR_ST_ACTIVE;
 158                                 sr_info("Opened device %d on %d.%d interface %d.",
 159                                         sdi->index, devc->usb->bus,
 160                                         devc->usb->address, USB_INTERFACE);
 161                         }
 162                 } else {
 163                         sr_err("Failed to open device: %d.", err);
 164                 }
 165
 166                 /* If we made it here, we handled the device (somehow). */
 167                 break;
 168         }
 169         libusb_free_device_list(devlist, 1);
 170
 171         if (sdi->status != SR_ST_ACTIVE)
 172                 return SR_ERR;
 173
 174         return SR_OK;
 175 }
 176
 177 SR_PRIV void dso_close(struct sr_dev_inst *sdi)
 178 {
 179         struct dev_context *devc;
 180
 181         devc = sdi->priv;
 182
 183         if (devc->usb->devhdl == NULL)
 184                 return;
 185
 186         sr_info("Closing device %d on %d.%d interface %d.", sdi->index,
 187                 devc->usb->bus, devc->usb->address, USB_INTERFACE);
 188         libusb_release_interface(devc->usb->devhdl, USB_INTERFACE);
 189         libusb_close(devc->usb->devhdl);
 190         devc->usb->devhdl = NULL;
 191         sdi->status = SR_ST_INACTIVE;
 192
 193 }
 194
 195 static int get_channel_offsets(struct dev_context *devc)
 196 {
 197         GString *gs;
 198         int chan, v, ret;
 199
 200         sr_dbg("Getting channel offsets.");
 201
 202         ret = libusb_control_transfer(devc->usb->devhdl,
 203                         LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_VENDOR,
 204                         CTRL_READ_EEPROM, EEPROM_CHANNEL_OFFSETS, 0,
 205                         (unsigned char *)&devc->channel_levels,
 206                         sizeof(devc->channel_levels), 200);
 207         if (ret != sizeof(devc->channel_levels)) {
 208                 sr_err("Failed to get channel offsets: %d.", ret);
 209                 return SR_ERR;
 210         }
 211
 212         /* Comes in as 16-bit numbers with the second byte always 0 on
 213          * the DSO-2090. Guessing this is supposed to be big-endian,
 214          * since that's how voltage offsets are submitted back to the DSO.
 215          * Convert to host order now, so we can use them natively.
 216          */
 217         for (chan = 0; chan < 2; chan++) {
 218                 for (v = 0; v < 9; v++) {
 219                         devc->channel_levels[chan][v][0] =
 220                                 g_ntohs(devc->channel_levels[chan][v][0]);
 221                         devc->channel_levels[chan][v][1] =
 222                                 g_ntohs(devc->channel_levels[chan][v][1]);
 223                 }
 224         }
 225
 226         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 227                 gs = g_string_sized_new(128);
 228                 for (chan = 0; chan < 2; chan++) {
 229                         g_string_printf(gs, "CH%d:", chan + 1);
 230                         for (v = 0; v < 9; v++) {
 231                                 g_string_append_printf(gs, " %.4x-%.4x",
 232                                         devc->channel_levels[chan][v][0],
 233                                         devc->channel_levels[chan][v][1]);
 234                         }
 235                         sr_dbg(gs->str);
 236                 }
 237                 g_string_free(gs, TRUE);
 238         }
 239
 240         return SR_OK;
 241 }
 242
 243 SR_PRIV int dso_set_trigger_samplerate(struct dev_context *devc)
 244 {
 245         int ret, tmp;
 246         uint8_t cmdstring[12];
 247         uint16_t timebase_small[] = { 0xffff, 0xfffc, 0xfff7, 0xffe8, 0xffce,
 248                 0xff9c, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79, 0xd8f1 };
 249         uint16_t timebase_large[] = { 0xffff, 0x0000, 0xfffc, 0xfff7, 0xffe8,
 250                 0xffce, 0xff9d, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79 };
 251
 252         sr_dbg("Preparing CMD_SET_TRIGGER_SAMPLERATE.");
 253
 254         memset(cmdstring, 0, sizeof(cmdstring));
 255         /* Command */
 256         cmdstring[0] = CMD_SET_TRIGGER_SAMPLERATE;
 257
 258         /* Trigger source */
 259         sr_dbg("Trigger source %s.", devc->triggersource);
 260         if (!strcmp("CH2", devc->triggersource))
 261                 tmp = 0;
 262         else if (!strcmp("CH1", devc->triggersource))
 263                 tmp = 1;
 264         else if (!strcmp("EXT", devc->triggersource))
 265                 tmp = 2;
 266         else {
 267                 sr_err("Invalid trigger source: '%s'.", devc->triggersource);
 268                 return SR_ERR_ARG;
 269         }
 270         cmdstring[2] = tmp;
 271
 272         /* Frame size */
 273         sr_dbg("Frame size: %d.", devc->framesize);
 274         cmdstring[2] |= (devc->framesize == FRAMESIZE_SMALL ? 0x01 : 0x02) << 2;
 275
 276         /* Timebase fast */
 277         sr_dbg("Time base index: %d.", devc->timebase);
 278         switch (devc->framesize) {
 279         case FRAMESIZE_SMALL:
 280                 if (devc->timebase < TIME_20us)
 281                         tmp = 0;
 282                 else if (devc->timebase == TIME_20us)
 283                         tmp = 1;
 284                 else if (devc->timebase == TIME_40us)
 285                         tmp = 2;
 286                 else if (devc->timebase == TIME_100us)
 287                         tmp = 3;
 288                 else if (devc->timebase >= TIME_200us)
 289                         tmp = 4;
 290                 break;
 291         case FRAMESIZE_LARGE:
 292                 if (devc->timebase < TIME_40us) {
 293                         sr_err("Timebase < 40us only supported with 10K buffer.");
 294                         return SR_ERR_ARG;
 295                 }
 296                 else if (devc->timebase == TIME_40us)
 297                         tmp = 0;
 298                 else if (devc->timebase == TIME_100us)
 299                         tmp = 2;
 300                 else if (devc->timebase == TIME_200us)
 301                         tmp = 3;
 302                 else if (devc->timebase >= TIME_400us)
 303                         tmp = 4;
 304                 break;
 305         }
 306         cmdstring[2] |= (tmp & 0x07) << 5;
 307
 308         /* Enabled channels: 00=CH1 01=CH2 10=both */
 309         sr_dbg("Channels CH1=%d CH2=%d", devc->ch1_enabled, devc->ch2_enabled);
 310         tmp = (((devc->ch2_enabled ? 1 : 0) << 1) + (devc->ch1_enabled ? 1 : 0)) - 1;
 311         cmdstring[3] = tmp;
 312
 313         /* Fast rates channel */
 314         /* TODO: Is this right? */
 315         tmp = devc->timebase < TIME_10us ? 1 : 0;
 316         cmdstring[3] |= tmp << 2;
 317
 318         /* Trigger slope: 0=positive 1=negative */
 319         /* TODO: Does this work? */
 320         sr_dbg("Trigger slope: %d.", devc->triggerslope);
 321         cmdstring[3] |= (devc->triggerslope == SLOPE_NEGATIVE ? 1 : 0) << 3;
 322
 323         /* Timebase slow */
 324         if (devc->timebase < TIME_100us)
 325                 tmp = 0;
 326         else if (devc->timebase > TIME_400ms)
 327                 tmp = 0xffed;
 328         else {
 329                 if (devc->framesize == FRAMESIZE_SMALL)
 330                         tmp = timebase_small[devc->timebase - 3];
 331                 else
 332                         tmp = timebase_large[devc->timebase - 3];
 333         }
 334         cmdstring[4] = tmp & 0xff;
 335         cmdstring[5] = (tmp >> 8) & 0xff;
 336
 337         /* Horizontal trigger position */
 338         sr_dbg("Trigger position: %3.2f.", devc->triggerposition);
 339         tmp = 0x77fff + 0x8000 * devc->triggerposition;
 340         cmdstring[6] = tmp & 0xff;
 341         cmdstring[7] = (tmp >> 8) & 0xff;
 342         cmdstring[10] = (tmp >> 16) & 0xff;
 343
 344         if (send_begin(devc) != SR_OK)
 345                 return SR_ERR;
 346
 347         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 348                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 349                         cmdstring, sizeof(cmdstring),
 350                         &tmp, 100)) != 0) {
 351                 sr_err("Failed to set trigger/samplerate: %d.", ret);
 352                 return SR_ERR;
 353         }
 354         sr_dbg("Sent CMD_SET_TRIGGER_SAMPLERATE.");
 355
 356         return SR_OK;
 357 }
 358
 359 SR_PRIV int dso_set_filters(struct dev_context *devc)
 360 {
 361         int ret, tmp;
 362         uint8_t cmdstring[8];
 363
 364         sr_dbg("Preparing CMD_SET_FILTERS.");
 365
 366         memset(cmdstring, 0, sizeof(cmdstring));
 367         cmdstring[0] = CMD_SET_FILTERS;
 368         cmdstring[1] = 0x0f;
 369         if (devc->filter_ch1) {
 370                 sr_dbg("Turning on CH1 filter.");
 371                 cmdstring[2] |= 0x80;
 372         }
 373         if (devc->filter_ch2) {
 374                 sr_dbg("Turning on CH2 filter.");
 375                 cmdstring[2] |= 0x40;
 376         }
 377         if (devc->filter_trigger) {
 378                 /* TODO: supported on the DSO-2090? */
 379                 sr_dbg("Turning on trigger filter.");
 380                 cmdstring[2] |= 0x20;
 381         }
 382
 383         if (send_begin(devc) != SR_OK)
 384                 return SR_ERR;
 385
 386         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 387                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 388                         cmdstring, sizeof(cmdstring),
 389                         &tmp, 100)) != 0) {
 390                 sr_err("Failed to set filters: %d", ret);
 391                 return SR_ERR;
 392         }
 393         sr_dbg("Sent CMD_SET_FILTERS.");
 394
 395         return SR_OK;
 396 }
 397
 398 SR_PRIV int dso_set_voltage(struct dev_context *devc)
 399 {
 400         int ret, tmp;
 401         uint8_t cmdstring[8];
 402
 403         sr_dbg("Preparing CMD_SET_VOLTAGE.");
 404
 405         memset(cmdstring, 0, sizeof(cmdstring));
 406         cmdstring[0] = CMD_SET_VOLTAGE;
 407         cmdstring[1] = 0x0f;
 408         cmdstring[2] = 0x30;
 409
 410         /* CH1 volts/div is encoded in bits 0-1 */
 411         sr_dbg("CH1 vdiv index: %d.", devc->voltage_ch1);
 412         switch (devc->voltage_ch1) {
 413         case VDIV_1V:
 414         case VDIV_100MV:
 415         case VDIV_10MV:
 416                 cmdstring[2] |= 0x00;
 417                 break;
 418         case VDIV_2V:
 419         case VDIV_200MV:
 420         case VDIV_20MV:
 421                 cmdstring[2] |= 0x01;
 422                 break;
 423         case VDIV_5V:
 424         case VDIV_500MV:
 425         case VDIV_50MV:
 426                 cmdstring[2] |= 0x02;
 427                 break;
 428         }
 429
 430         /* CH2 volts/div is encoded in bits 2-3 */
 431         sr_dbg("CH2 vdiv index: %d.", devc->voltage_ch2);
 432         switch (devc->voltage_ch2) {
 433         case VDIV_1V:
 434         case VDIV_100MV:
 435         case VDIV_10MV:
 436                 cmdstring[2] |= 0x00;
 437                 break;
 438         case VDIV_2V:
 439         case VDIV_200MV:
 440         case VDIV_20MV:
 441                 cmdstring[2] |= 0x04;
 442                 break;
 443         case VDIV_5V:
 444         case VDIV_500MV:
 445         case VDIV_50MV:
 446                 cmdstring[2] |= 0x08;
 447                 break;
 448         }
 449
 450         if (send_begin(devc) != SR_OK)
 451                 return SR_ERR;
 452
 453         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 454                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 455                         cmdstring, sizeof(cmdstring),
 456                         &tmp, 100)) != 0) {
 457                 sr_err("Failed to set voltage: %d.", ret);
 458                 return SR_ERR;
 459         }
 460         sr_dbg("Sent CMD_SET_VOLTAGE.");
 461
 462         return SR_OK;
 463 }
 464
 465 SR_PRIV int dso_set_relays(struct dev_context *devc)
 466 {
 467         GString *gs;
 468         int ret, i;
 469         uint8_t relays[17] = { 0x00, 0x04, 0x08, 0x02, 0x20, 0x40, 0x10, 0x01,
 470                         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 471
 472         sr_dbg("Preparing CTRL_SETRELAYS.");
 473
 474         if (devc->voltage_ch1 < VDIV_1V)
 475                 relays[1] = ~relays[1];
 476
 477         if (devc->voltage_ch1 < VDIV_100MV)
 478                 relays[2] = ~relays[2];
 479
 480         sr_dbg("CH1 coupling: %d.", devc->coupling_ch1);
 481         if (devc->coupling_ch1 != COUPLING_AC)
 482                 relays[3] = ~relays[3];
 483
 484         if (devc->voltage_ch2 < VDIV_1V)
 485                 relays[4] = ~relays[4];
 486
 487         if (devc->voltage_ch2 < VDIV_100MV)
 488                 relays[5] = ~relays[5];
 489
 490         sr_dbg("CH2 coupling: %d.", devc->coupling_ch1);
 491         if (devc->coupling_ch2 != COUPLING_AC)
 492                 relays[6] = ~relays[6];
 493
 494         if (!strcmp(devc->triggersource, "EXT"))
 495                 relays[7] = ~relays[7];
 496
 497         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 498                 gs = g_string_sized_new(128);
 499                 g_string_printf(gs, "Relays:");
 500                 for (i = 0; i < 17; i++)
 501                         g_string_append_printf(gs, " %.2x", relays[i]);
 502                 sr_dbg(gs->str);
 503                 g_string_free(gs, TRUE);
 504         }
 505
 506         if ((ret = libusb_control_transfer(devc->usb->devhdl,
 507                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETRELAYS,
 508                         0, 0, relays, 17, 100)) != sizeof(relays)) {
 509                 sr_err("Failed to set relays: %d.", ret);
 510                 return SR_ERR;
 511         }
 512         sr_dbg("Sent CTRL_SETRELAYS.");
 513
 514         return SR_OK;
 515 }
 516
 517 SR_PRIV int dso_set_voffsets(struct dev_context *devc)
 518 {
 519         int offset, ret;
 520         uint16_t *ch_levels;
 521         uint8_t offsets[17];
 522
 523         sr_dbg("Preparing CTRL_SETOFFSET.");
 524
 525         memset(offsets, 0, sizeof(offsets));
 526         /* Channel 1 */
 527         ch_levels = devc->channel_levels[0][devc->voltage_ch1];
 528         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch1 + ch_levels[0];
 529         offsets[0] = (offset >> 8) | 0x20;
 530         offsets[1] = offset & 0xff;
 531         sr_dbg("CH1 offset: %3.2f (%.2x%.2x).", devc->voffset_ch1,
 532                offsets[0], offsets[1]);
 533
 534         /* Channel 2 */
 535         ch_levels = devc->channel_levels[1][devc->voltage_ch2];
 536         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch2 + ch_levels[0];
 537         offsets[2] = (offset >> 8) | 0x20;
 538         offsets[3] = offset & 0xff;
 539         sr_dbg("CH2 offset: %3.2f (%.2x%.2x).", devc->voffset_ch2,
 540                offsets[2], offsets[3]);
 541
 542         /* Trigger */
 543         offset = MAX_VERT_TRIGGER * devc->voffset_trigger;
 544         offsets[4] = (offset >> 8) | 0x20;
 545         offsets[5] = offset & 0xff;
 546         sr_dbg("Trigger offset: %3.2f (%.2x%.2x).", devc->voffset_trigger,
 547                         offsets[4], offsets[5]);
 548
 549         if ((ret = libusb_control_transfer(devc->usb->devhdl,
 550                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETOFFSET,
 551                         0, 0, offsets, sizeof(offsets), 100)) != sizeof(offsets)) {
 552                 sr_err("Failed to set offsets: %d.", ret);
 553                 return SR_ERR;
 554         }
 555         sr_dbg("Sent CTRL_SETOFFSET.");
 556
 557         return SR_OK;
 558 }
 559
 560 SR_PRIV int dso_enable_trigger(struct dev_context *devc)
 561 {
 562         int ret, tmp;
 563         uint8_t cmdstring[2];
 564
 565         sr_dbg("Sending CMD_ENABLE_TRIGGER.");
 566
 567         memset(cmdstring, 0, sizeof(cmdstring));
 568         cmdstring[0] = CMD_ENABLE_TRIGGER;
 569         cmdstring[1] = 0x00;
 570
 571         if (send_begin(devc) != SR_OK)
 572                 return SR_ERR;
 573
 574         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 575                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 576                         cmdstring, sizeof(cmdstring),
 577                         &tmp, 100)) != 0) {
 578                 sr_err("Failed to enable trigger: %d.", ret);
 579                 return SR_ERR;
 580         }
 581
 582         return SR_OK;
 583 }
 584
 585 SR_PRIV int dso_force_trigger(struct dev_context *devc)
 586 {
 587         int ret, tmp;
 588         uint8_t cmdstring[2];
 589
 590         sr_dbg("Sending CMD_FORCE_TRIGGER.");
 591
 592         memset(cmdstring, 0, sizeof(cmdstring));
 593         cmdstring[0] = CMD_FORCE_TRIGGER;
 594         cmdstring[1] = 0x00;
 595
 596         if (send_begin(devc) != SR_OK)
 597                 return SR_ERR;
 598
 599         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 600                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 601                         cmdstring, sizeof(cmdstring),
 602                         &tmp, 100)) != 0) {
 603                 sr_err("Failed to force trigger: %d.", ret);
 604                 return SR_ERR;
 605         }
 606
 607         return SR_OK;
 608 }
 609
 610 SR_PRIV int dso_init(struct dev_context *devc)
 611 {
 612
 613         sr_dbg("Initializing DSO.");
 614
 615         if (get_channel_offsets(devc) != SR_OK)
 616                 return SR_ERR;
 617
 618         if (dso_set_trigger_samplerate(devc) != SR_OK)
 619                 return SR_ERR;
 620
 621         if (dso_set_filters(devc) != SR_OK)
 622                 return SR_ERR;
 623
 624         if (dso_set_voltage(devc) != SR_OK)
 625                 return SR_ERR;
 626
 627         if (dso_set_relays(devc) != SR_OK)
 628                 return SR_ERR;
 629
 630         if (dso_set_voffsets(devc) != SR_OK)
 631                 return SR_ERR;
 632
 633         if (dso_enable_trigger(devc) != SR_OK)
 634                 return SR_ERR;
 635
 636         return SR_OK;
 637 }
 638
 639 SR_PRIV int dso_get_capturestate(struct dev_context *devc,
 640                                  uint8_t *capturestate,
 641                                  uint32_t *trigger_offset)
 642 {
 643         int ret, tmp, i;
 644         unsigned int bitvalue, toff;
 645         uint8_t cmdstring[2], inbuf[512];
 646
 647         sr_dbg("Sending CMD_GET_CAPTURESTATE.");
 648
 649         cmdstring[0] = CMD_GET_CAPTURESTATE;
 650         cmdstring[1] = 0;
 651
 652         if ((ret = send_bulkcmd(devc, cmdstring, sizeof(cmdstring))) != SR_OK) {
 653                 sr_dbg("Failed to send get_capturestate command: %d.", ret);
 654                 return SR_ERR;
 655         }
 656
 657         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 658                         DSO_EP_IN | LIBUSB_ENDPOINT_IN,
 659                         inbuf, 512, &tmp, 100)) != 0) {
 660                 sr_dbg("Failed to get capturestate: %d.", ret);
 661                 return SR_ERR;
 662         }
 663         *capturestate = inbuf[0];
 664         toff = (inbuf[1] << 16) | (inbuf[3] << 8) | inbuf[2];
 665
 666         /*
 667          * This conversion comes from the openhantek project.
 668          * Each set bit in the 24-bit value inverts all bits with a lower
 669          * value. No idea why the device reports the trigger point this way.
 670          */
 671         bitvalue = 1;
 672         for (i = 0; i < 24; i++) {
 673                 /* Each set bit inverts all bits with a lower value. */
 674                 if(toff & bitvalue)
 675                         toff ^= bitvalue - 1;
 676                 bitvalue <<= 1;
 677         }
 678         *trigger_offset = toff;
 679
 680         return SR_OK;
 681 }
 682
 683 SR_PRIV int dso_capture_start(struct dev_context *devc)
 684 {
 685         int ret;
 686         uint8_t cmdstring[2];
 687
 688         sr_dbg("Sending CMD_CAPTURE_START.");
 689
 690         cmdstring[0] = CMD_CAPTURE_START;
 691         cmdstring[1] = 0;
 692
 693         if ((ret = send_bulkcmd(devc, cmdstring, sizeof(cmdstring))) != SR_OK) {
 694                 sr_err("Failed to send capture_start command: %d.", ret);
 695                 return SR_ERR;
 696         }
 697
 698         return SR_OK;
 699 }
 700
 701 SR_PRIV int dso_get_channeldata(struct dev_context *devc, libusb_transfer_cb_fn cb)
 702 {
 703         struct libusb_transfer *transfer;
 704         int num_transfers, ret, i;
 705         uint8_t cmdstring[2];
 706         unsigned char *buf;
 707
 708         sr_dbg("Sending CMD_GET_CHANNELDATA.");
 709
 710         cmdstring[0] = CMD_GET_CHANNELDATA;
 711         cmdstring[1] = 0;
 712
 713         if ((ret = send_bulkcmd(devc, cmdstring, sizeof(cmdstring))) != SR_OK) {
 714                 sr_err("Failed to get channel data: %d.", ret);
 715                 return SR_ERR;
 716         }
 717
 718         /* TODO: DSO-2xxx only. */
 719         num_transfers = devc->framesize *
 720                         sizeof(unsigned short) / devc->epin_maxpacketsize;
 721         sr_dbg("Queueing up %d transfers.", num_transfers);
 722         for (i = 0; i < num_transfers; i++) {
 723                 if (!(buf = g_try_malloc(devc->epin_maxpacketsize))) {
 724                         sr_err("Failed to malloc USB endpoint buffer.");
 725                         return SR_ERR_MALLOC;
 726                 }
 727                 transfer = libusb_alloc_transfer(0);
 728                 libusb_fill_bulk_transfer(transfer, devc->usb->devhdl,
 729                                 DSO_EP_IN | LIBUSB_ENDPOINT_IN, buf,
 730                                 devc->epin_maxpacketsize, cb, devc, 40);
 731                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 732                         sr_err("Failed to submit transfer: %d.", ret);
 733                         /* TODO: Free them all. */
 734                         libusb_free_transfer(transfer);
 735                         g_free(buf);
 736                         return SR_ERR;
 737                 }
 738         }
 739
 740         return SR_OK;
 741 }