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, skip, i;
 117
 118         devc = sdi->priv;
 119         usb = sdi->conn;
 120
 121         if (sdi->status == SR_ST_ACTIVE)
 122                 /* already in use */
 123                 return SR_ERR;
 124
 125         skip = 0;
 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                         if (skip != sdi->index) {
 140                                 /* Skip devices of this type that aren't the one we want. */
 141                                 skip += 1;
 142                                 continue;
 143                         }
 144                 } else if (sdi->status == SR_ST_INACTIVE) {
 145                         /*
 146                          * This device is fully enumerated, so we need to find
 147                          * this device by vendor, product, bus and address.
 148                          */
 149                         if (libusb_get_bus_number(devlist[i]) != usb->bus
 150                                 || libusb_get_device_address(devlist[i]) != usb->address)
 151                                 /* this is not the one */
 152                                 continue;
 153                 }
 154
 155                 if (!(err = libusb_open(devlist[i], &usb->devhdl))) {
 156                         if (usb->address == 0xff)
 157                                 /*
 158                                  * first time we touch this device after firmware upload,
 159                                  * so we don't know the address yet.
 160                                  */
 161                                 usb->address = libusb_get_device_address(devlist[i]);
 162
 163                         if (!(devc->epin_maxpacketsize = dso_getmps(devlist[i])))
 164                                 sr_err("Wrong endpoint profile.");
 165                         else {
 166                                 sdi->status = SR_ST_ACTIVE;
 167                                 sr_info("Opened device %d on %d.%d interface %d.",
 168                                         sdi->index, usb->bus,
 169                                         usb->address, USB_INTERFACE);
 170                         }
 171                 } else {
 172                         sr_err("Failed to open device: %s.",
 173                                libusb_error_name(err));
 174                 }
 175
 176                 /* If we made it here, we handled the device (somehow). */
 177                 break;
 178         }
 179         libusb_free_device_list(devlist, 1);
 180
 181         if (sdi->status != SR_ST_ACTIVE)
 182                 return SR_ERR;
 183
 184         return SR_OK;
 185 }
 186
 187 SR_PRIV void dso_close(struct sr_dev_inst *sdi)
 188 {
 189         struct sr_usb_dev_inst *usb;
 190
 191         usb = sdi->conn;
 192
 193         if (usb->devhdl == NULL)
 194                 return;
 195
 196         sr_info("Closing device %d on %d.%d interface %d.", sdi->index,
 197                 usb->bus, usb->address, USB_INTERFACE);
 198         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 199         libusb_close(usb->devhdl);
 200         usb->devhdl = NULL;
 201         sdi->status = SR_ST_INACTIVE;
 202
 203 }
 204
 205 static int get_channel_offsets(const struct sr_dev_inst *sdi)
 206 {
 207         struct dev_context *devc;
 208         struct sr_usb_dev_inst *usb;
 209         GString *gs;
 210         int chan, v, ret;
 211
 212         sr_dbg("Getting channel offsets.");
 213
 214         devc = sdi->priv;
 215         usb = sdi->conn;
 216
 217         ret = libusb_control_transfer(usb->devhdl,
 218                         LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_VENDOR,
 219                         CTRL_READ_EEPROM, EEPROM_CHANNEL_OFFSETS, 0,
 220                         (unsigned char *)&devc->channel_levels,
 221                         sizeof(devc->channel_levels), 200);
 222         if (ret != sizeof(devc->channel_levels)) {
 223                 sr_err("Failed to get channel offsets: %s.",
 224                        libusb_error_name(ret));
 225                 return SR_ERR;
 226         }
 227
 228         /* Comes in as 16-bit numbers with the second byte always 0 on
 229          * the DSO-2090. Guessing this is supposed to be big-endian,
 230          * since that's how voltage offsets are submitted back to the DSO.
 231          * Convert to host order now, so we can use them natively.
 232          */
 233         for (chan = 0; chan < 2; chan++) {
 234                 for (v = 0; v < 9; v++) {
 235                         devc->channel_levels[chan][v][0] =
 236                                 g_ntohs(devc->channel_levels[chan][v][0]);
 237                         devc->channel_levels[chan][v][1] =
 238                                 g_ntohs(devc->channel_levels[chan][v][1]);
 239                 }
 240         }
 241
 242         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 243                 gs = g_string_sized_new(128);
 244                 for (chan = 0; chan < 2; chan++) {
 245                         g_string_printf(gs, "CH%d:", chan + 1);
 246                         for (v = 0; v < 9; v++) {
 247                                 g_string_append_printf(gs, " %.4x-%.4x",
 248                                         devc->channel_levels[chan][v][0],
 249                                         devc->channel_levels[chan][v][1]);
 250                         }
 251                         sr_dbg("%s", gs->str);
 252                 }
 253                 g_string_free(gs, TRUE);
 254         }
 255
 256         return SR_OK;
 257 }
 258
 259 static int dso_set_trigger_samplerate(const struct sr_dev_inst *sdi)
 260 {
 261         struct dev_context *devc;
 262         struct sr_usb_dev_inst *usb;
 263         int ret, tmp;
 264         uint8_t cmdstring[12];
 265         uint16_t timebase_small[] = { 0xffff, 0xfffc, 0xfff7, 0xffe8, 0xffce,
 266                 0xff9c, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79, 0xd8f1 };
 267         uint16_t timebase_large[] = { 0xffff, 0x0000, 0xfffc, 0xfff7, 0xffe8,
 268                 0xffce, 0xff9d, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79 };
 269
 270         sr_dbg("Preparing CMD_SET_TRIGGER_SAMPLERATE.");
 271
 272         devc = sdi->priv;
 273         usb = sdi->conn;
 274
 275         memset(cmdstring, 0, sizeof(cmdstring));
 276         /* Command */
 277         cmdstring[0] = CMD_SET_TRIGGER_SAMPLERATE;
 278
 279         /* Trigger source */
 280         sr_dbg("Trigger source %s.", devc->triggersource);
 281         if (!strcmp("CH2", devc->triggersource))
 282                 tmp = 0;
 283         else if (!strcmp("CH1", devc->triggersource))
 284                 tmp = 1;
 285         else if (!strcmp("EXT", devc->triggersource))
 286                 tmp = 2;
 287         else {
 288                 sr_err("Invalid trigger source: '%s'.", devc->triggersource);
 289                 return SR_ERR_ARG;
 290         }
 291         cmdstring[2] = tmp;
 292
 293         /* Frame size */
 294         sr_dbg("Frame size: %d.", devc->framesize);
 295         cmdstring[2] |= (devc->framesize == FRAMESIZE_SMALL ? 0x01 : 0x02) << 2;
 296
 297         /* Timebase fast */
 298         sr_dbg("Time base index: %d.", devc->timebase);
 299         if (devc->framesize == FRAMESIZE_SMALL) {
 300                 if (devc->timebase < TIME_20us)
 301                         tmp = 0;
 302                 else if (devc->timebase == TIME_20us)
 303                         tmp = 1;
 304                 else if (devc->timebase == TIME_40us)
 305                         tmp = 2;
 306                 else if (devc->timebase == TIME_100us)
 307                         tmp = 3;
 308                 else if (devc->timebase >= TIME_200us)
 309                         tmp = 4;
 310         } else {
 311                 if (devc->timebase < TIME_40us) {
 312                         sr_err("Timebase < 40us only supported with 10K buffer.");
 313                         return SR_ERR_ARG;
 314                 }
 315                 else if (devc->timebase == TIME_40us)
 316                         tmp = 0;
 317                 else if (devc->timebase == TIME_100us)
 318                         tmp = 2;
 319                 else if (devc->timebase == TIME_200us)
 320                         tmp = 3;
 321                 else if (devc->timebase >= TIME_400us)
 322                         tmp = 4;
 323         }
 324         cmdstring[2] |= (tmp & 0x07) << 5;
 325
 326         /* Enabled channels: 00=CH1 01=CH2 10=both */
 327         sr_dbg("Channels CH1=%d CH2=%d", devc->ch1_enabled, devc->ch2_enabled);
 328         tmp = (((devc->ch2_enabled ? 1 : 0) << 1) + (devc->ch1_enabled ? 1 : 0)) - 1;
 329         cmdstring[3] = tmp;
 330
 331         /* Fast rates channel */
 332         /* TODO: Is this right? */
 333         tmp = devc->timebase < TIME_10us ? 1 : 0;
 334         cmdstring[3] |= tmp << 2;
 335
 336         /* Trigger slope: 0=positive 1=negative */
 337         /* TODO: Does this work? */
 338         sr_dbg("Trigger slope: %d.", devc->triggerslope);
 339         cmdstring[3] |= (devc->triggerslope == SLOPE_NEGATIVE ? 1 : 0) << 3;
 340
 341         /* Timebase slow */
 342         if (devc->timebase < TIME_100us)
 343                 tmp = 0;
 344         else if (devc->timebase > TIME_400ms)
 345                 tmp = 0xffed;
 346         else {
 347                 if (devc->framesize == FRAMESIZE_SMALL)
 348                         tmp = timebase_small[devc->timebase - 3];
 349                 else
 350                         tmp = timebase_large[devc->timebase - 3];
 351         }
 352         cmdstring[4] = tmp & 0xff;
 353         cmdstring[5] = (tmp >> 8) & 0xff;
 354
 355         /* Horizontal trigger position */
 356         sr_dbg("Trigger position: %3.2f.", devc->triggerposition);
 357         tmp = 0x77fff + 0x8000 * devc->triggerposition;
 358         cmdstring[6] = tmp & 0xff;
 359         cmdstring[7] = (tmp >> 8) & 0xff;
 360         cmdstring[10] = (tmp >> 16) & 0xff;
 361
 362         if (send_begin(sdi) != SR_OK)
 363                 return SR_ERR;
 364
 365         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 366                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 367                 sr_err("Failed to set trigger/samplerate: %s.",
 368                        libusb_error_name(ret));
 369                 return SR_ERR;
 370         }
 371         sr_dbg("Sent CMD_SET_TRIGGER_SAMPLERATE.");
 372
 373         return SR_OK;
 374 }
 375
 376 static int dso_set_filters(const struct sr_dev_inst *sdi)
 377 {
 378         struct dev_context *devc;
 379         struct sr_usb_dev_inst *usb;
 380         int ret, tmp;
 381         uint8_t cmdstring[8];
 382
 383         sr_dbg("Preparing CMD_SET_FILTERS.");
 384
 385         devc = sdi->priv;
 386         usb = sdi->conn;
 387
 388         memset(cmdstring, 0, sizeof(cmdstring));
 389         cmdstring[0] = CMD_SET_FILTERS;
 390         cmdstring[1] = 0x0f;
 391         if (devc->filter_ch1) {
 392                 sr_dbg("Turning on CH1 filter.");
 393                 cmdstring[2] |= 0x80;
 394         }
 395         if (devc->filter_ch2) {
 396                 sr_dbg("Turning on CH2 filter.");
 397                 cmdstring[2] |= 0x40;
 398         }
 399         if (devc->filter_trigger) {
 400                 /* TODO: supported on the DSO-2090? */
 401                 sr_dbg("Turning on trigger filter.");
 402                 cmdstring[2] |= 0x20;
 403         }
 404
 405         if (send_begin(sdi) != SR_OK)
 406                 return SR_ERR;
 407
 408         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 409                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 410                 sr_err("Failed to set filters: %s.", libusb_error_name(ret));
 411                 return SR_ERR;
 412         }
 413         sr_dbg("Sent CMD_SET_FILTERS.");
 414
 415         return SR_OK;
 416 }
 417
 418 static int dso_set_voltage(const struct sr_dev_inst *sdi)
 419 {
 420         struct dev_context *devc;
 421         struct sr_usb_dev_inst *usb;
 422         int ret, tmp;
 423         uint8_t cmdstring[8];
 424
 425         sr_dbg("Preparing CMD_SET_VOLTAGE.");
 426
 427         devc = sdi->priv;
 428         usb = sdi->conn;
 429
 430         memset(cmdstring, 0, sizeof(cmdstring));
 431         cmdstring[0] = CMD_SET_VOLTAGE;
 432         cmdstring[1] = 0x0f;
 433         cmdstring[2] = 0x30;
 434
 435         /* CH1 volts/div is encoded in bits 0-1 */
 436         sr_dbg("CH1 vdiv index: %d.", devc->voltage_ch1);
 437         switch (devc->voltage_ch1) {
 438         case VDIV_1V:
 439         case VDIV_100MV:
 440         case VDIV_10MV:
 441                 cmdstring[2] |= 0x00;
 442                 break;
 443         case VDIV_2V:
 444         case VDIV_200MV:
 445         case VDIV_20MV:
 446                 cmdstring[2] |= 0x01;
 447                 break;
 448         case VDIV_5V:
 449         case VDIV_500MV:
 450         case VDIV_50MV:
 451                 cmdstring[2] |= 0x02;
 452                 break;
 453         }
 454
 455         /* CH2 volts/div is encoded in bits 2-3 */
 456         sr_dbg("CH2 vdiv index: %d.", devc->voltage_ch2);
 457         switch (devc->voltage_ch2) {
 458         case VDIV_1V:
 459         case VDIV_100MV:
 460         case VDIV_10MV:
 461                 cmdstring[2] |= 0x00;
 462                 break;
 463         case VDIV_2V:
 464         case VDIV_200MV:
 465         case VDIV_20MV:
 466                 cmdstring[2] |= 0x04;
 467                 break;
 468         case VDIV_5V:
 469         case VDIV_500MV:
 470         case VDIV_50MV:
 471                 cmdstring[2] |= 0x08;
 472                 break;
 473         }
 474
 475         if (send_begin(sdi) != SR_OK)
 476                 return SR_ERR;
 477
 478         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 479                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 480                 sr_err("Failed to set voltage: %s.", libusb_error_name(ret));
 481                 return SR_ERR;
 482         }
 483         sr_dbg("Sent CMD_SET_VOLTAGE.");
 484
 485         return SR_OK;
 486 }
 487
 488 static int dso_set_relays(const struct sr_dev_inst *sdi)
 489 {
 490         struct dev_context *devc;
 491         struct sr_usb_dev_inst *usb;
 492         GString *gs;
 493         int ret, i;
 494         uint8_t relays[17] = { 0x00, 0x04, 0x08, 0x02, 0x20, 0x40, 0x10, 0x01,
 495                         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 496
 497         sr_dbg("Preparing CTRL_SETRELAYS.");
 498
 499         devc = sdi->priv;
 500         usb = sdi->conn;
 501
 502         if (devc->voltage_ch1 < VDIV_1V)
 503                 relays[1] = ~relays[1];
 504
 505         if (devc->voltage_ch1 < VDIV_100MV)
 506                 relays[2] = ~relays[2];
 507
 508         sr_dbg("CH1 coupling: %d.", devc->coupling_ch1);
 509         if (devc->coupling_ch1 != COUPLING_AC)
 510                 relays[3] = ~relays[3];
 511
 512         if (devc->voltage_ch2 < VDIV_1V)
 513                 relays[4] = ~relays[4];
 514
 515         if (devc->voltage_ch2 < VDIV_100MV)
 516                 relays[5] = ~relays[5];
 517
 518         sr_dbg("CH2 coupling: %d.", devc->coupling_ch1);
 519         if (devc->coupling_ch2 != COUPLING_AC)
 520                 relays[6] = ~relays[6];
 521
 522         if (!strcmp(devc->triggersource, "EXT"))
 523                 relays[7] = ~relays[7];
 524
 525         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 526                 gs = g_string_sized_new(128);
 527                 g_string_printf(gs, "Relays:");
 528                 for (i = 0; i < 17; i++)
 529                         g_string_append_printf(gs, " %.2x", relays[i]);
 530                 sr_dbg("%s", gs->str);
 531                 g_string_free(gs, TRUE);
 532         }
 533
 534         if ((ret = libusb_control_transfer(usb->devhdl,
 535                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETRELAYS,
 536                         0, 0, relays, 17, 100)) != sizeof(relays)) {
 537                 sr_err("Failed to set relays: %s.", libusb_error_name(ret));
 538                 return SR_ERR;
 539         }
 540         sr_dbg("Sent CTRL_SETRELAYS.");
 541
 542         return SR_OK;
 543 }
 544
 545 static int dso_set_voffsets(const struct sr_dev_inst *sdi)
 546 {
 547         struct dev_context *devc;
 548         struct sr_usb_dev_inst *usb;
 549         int offset, ret;
 550         uint16_t *ch_levels;
 551         uint8_t offsets[17];
 552
 553         sr_dbg("Preparing CTRL_SETOFFSET.");
 554
 555         devc = sdi->priv;
 556         usb = sdi->conn;
 557
 558         memset(offsets, 0, sizeof(offsets));
 559         /* Channel 1 */
 560         ch_levels = devc->channel_levels[0][devc->voltage_ch1];
 561         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch1 + ch_levels[0];
 562         offsets[0] = (offset >> 8) | 0x20;
 563         offsets[1] = offset & 0xff;
 564         sr_dbg("CH1 offset: %3.2f (%.2x%.2x).", devc->voffset_ch1,
 565                offsets[0], offsets[1]);
 566
 567         /* Channel 2 */
 568         ch_levels = devc->channel_levels[1][devc->voltage_ch2];
 569         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch2 + ch_levels[0];
 570         offsets[2] = (offset >> 8) | 0x20;
 571         offsets[3] = offset & 0xff;
 572         sr_dbg("CH2 offset: %3.2f (%.2x%.2x).", devc->voffset_ch2,
 573                offsets[2], offsets[3]);
 574
 575         /* Trigger */
 576         offset = MAX_VERT_TRIGGER * devc->voffset_trigger;
 577         offsets[4] = (offset >> 8) | 0x20;
 578         offsets[5] = offset & 0xff;
 579         sr_dbg("Trigger offset: %3.2f (%.2x%.2x).", devc->voffset_trigger,
 580                         offsets[4], offsets[5]);
 581
 582         if ((ret = libusb_control_transfer(usb->devhdl,
 583                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETOFFSET,
 584                         0, 0, offsets, sizeof(offsets), 100)) != sizeof(offsets)) {
 585                 sr_err("Failed to set offsets: %s.", libusb_error_name(ret));
 586                 return SR_ERR;
 587         }
 588         sr_dbg("Sent CTRL_SETOFFSET.");
 589
 590         return SR_OK;
 591 }
 592
 593 SR_PRIV int dso_enable_trigger(const struct sr_dev_inst *sdi)
 594 {
 595         struct sr_usb_dev_inst *usb;
 596         int ret, tmp;
 597         uint8_t cmdstring[2];
 598
 599         sr_dbg("Sending CMD_ENABLE_TRIGGER.");
 600
 601         usb = sdi->conn;
 602
 603         memset(cmdstring, 0, sizeof(cmdstring));
 604         cmdstring[0] = CMD_ENABLE_TRIGGER;
 605         cmdstring[1] = 0x00;
 606
 607         if (send_begin(sdi) != SR_OK)
 608                 return SR_ERR;
 609
 610         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 611                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 612                 sr_err("Failed to enable trigger: %s.", libusb_error_name(ret));
 613                 return SR_ERR;
 614         }
 615
 616         return SR_OK;
 617 }
 618
 619 SR_PRIV int dso_force_trigger(const struct sr_dev_inst *sdi)
 620 {
 621         struct sr_usb_dev_inst *usb;
 622         int ret, tmp;
 623         uint8_t cmdstring[2];
 624
 625         sr_dbg("Sending CMD_FORCE_TRIGGER.");
 626
 627         usb = sdi->conn;
 628
 629         memset(cmdstring, 0, sizeof(cmdstring));
 630         cmdstring[0] = CMD_FORCE_TRIGGER;
 631         cmdstring[1] = 0x00;
 632
 633         if (send_begin(sdi) != SR_OK)
 634                 return SR_ERR;
 635
 636         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 637                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 638                 sr_err("Failed to force trigger: %s.", libusb_error_name(ret));
 639                 return SR_ERR;
 640         }
 641
 642         return SR_OK;
 643 }
 644
 645 SR_PRIV int dso_init(const struct sr_dev_inst *sdi)
 646 {
 647
 648         sr_dbg("Initializing DSO.");
 649
 650         if (get_channel_offsets(sdi) != SR_OK)
 651                 return SR_ERR;
 652
 653         if (dso_set_trigger_samplerate(sdi) != SR_OK)
 654                 return SR_ERR;
 655
 656         if (dso_set_filters(sdi) != SR_OK)
 657                 return SR_ERR;
 658
 659         if (dso_set_voltage(sdi) != SR_OK)
 660                 return SR_ERR;
 661
 662         if (dso_set_relays(sdi) != SR_OK)
 663                 return SR_ERR;
 664
 665         if (dso_set_voffsets(sdi) != SR_OK)
 666                 return SR_ERR;
 667
 668         if (dso_enable_trigger(sdi) != SR_OK)
 669                 return SR_ERR;
 670
 671         return SR_OK;
 672 }
 673
 674 SR_PRIV int dso_get_capturestate(const struct sr_dev_inst *sdi,
 675                 uint8_t *capturestate, uint32_t *trigger_offset)
 676 {
 677         struct sr_usb_dev_inst *usb;
 678         int ret, tmp, i;
 679         unsigned int bitvalue, toff;
 680         uint8_t cmdstring[2], inbuf[512];
 681
 682         sr_dbg("Sending CMD_GET_CAPTURESTATE.");
 683
 684         usb = sdi->conn;
 685
 686         cmdstring[0] = CMD_GET_CAPTURESTATE;
 687         cmdstring[1] = 0;
 688
 689         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 690                 sr_dbg("Failed to send get_capturestate command: %s.",
 691                        libusb_error_name(ret));
 692                 return SR_ERR;
 693         }
 694
 695         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_IN,
 696                         inbuf, 512, &tmp, 100)) != 0) {
 697                 sr_dbg("Failed to get capturestate: %s.",
 698                        libusb_error_name(ret));
 699                 return SR_ERR;
 700         }
 701         *capturestate = inbuf[0];
 702         toff = (inbuf[1] << 16) | (inbuf[3] << 8) | inbuf[2];
 703
 704         /*
 705          * This conversion comes from the openhantek project.
 706          * Each set bit in the 24-bit value inverts all bits with a lower
 707          * value. No idea why the device reports the trigger point this way.
 708          */
 709         bitvalue = 1;
 710         for (i = 0; i < 24; i++) {
 711                 /* Each set bit inverts all bits with a lower value. */
 712                 if(toff & bitvalue)
 713                         toff ^= bitvalue - 1;
 714                 bitvalue <<= 1;
 715         }
 716         *trigger_offset = toff;
 717
 718         return SR_OK;
 719 }
 720
 721 SR_PRIV int dso_capture_start(const struct sr_dev_inst *sdi)
 722 {
 723         int ret;
 724         uint8_t cmdstring[2];
 725
 726         sr_dbg("Sending CMD_CAPTURE_START.");
 727
 728         cmdstring[0] = CMD_CAPTURE_START;
 729         cmdstring[1] = 0;
 730
 731         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 732                 sr_err("Failed to send capture_start command: %s.",
 733                        libusb_error_name(ret));
 734                 return SR_ERR;
 735         }
 736
 737         return SR_OK;
 738 }
 739
 740 SR_PRIV int dso_get_channeldata(const struct sr_dev_inst *sdi,
 741                 libusb_transfer_cb_fn cb)
 742 {
 743         struct dev_context *devc;
 744         struct sr_usb_dev_inst *usb;
 745         struct libusb_transfer *transfer;
 746         int num_transfers, ret, i;
 747         uint8_t cmdstring[2];
 748         unsigned char *buf;
 749
 750         sr_dbg("Sending CMD_GET_CHANNELDATA.");
 751
 752         devc = sdi->priv;
 753         usb = sdi->conn;
 754
 755         cmdstring[0] = CMD_GET_CHANNELDATA;
 756         cmdstring[1] = 0;
 757
 758         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 759                 sr_err("Failed to get channel data: %s.",
 760                        libusb_error_name(ret));
 761                 return SR_ERR;
 762         }
 763
 764         /* TODO: DSO-2xxx only. */
 765         num_transfers = devc->framesize *
 766                         sizeof(unsigned short) / devc->epin_maxpacketsize;
 767         sr_dbg("Queueing up %d transfers.", num_transfers);
 768         for (i = 0; i < num_transfers; i++) {
 769                 if (!(buf = g_try_malloc(devc->epin_maxpacketsize))) {
 770                         sr_err("Failed to malloc USB endpoint buffer.");
 771                         return SR_ERR_MALLOC;
 772                 }
 773                 transfer = libusb_alloc_transfer(0);
 774                 libusb_fill_bulk_transfer(transfer, usb->devhdl, DSO_EP_IN, buf,
 775                                 devc->epin_maxpacketsize, cb, (void *)sdi, 40);
 776                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 777                         sr_err("Failed to submit transfer: %s.",
 778                                libusb_error_name(ret));
 779                         /* TODO: Free them all. */
 780                         libusb_free_transfer(transfer);
 781                         g_free(buf);
 782                         return SR_ERR;
 783                 }
 784         }
 785
 786         return SR_OK;
 787 }