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