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