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 <string.h>
  23 #include <glib.h>
  24 #include <libusb.h>
  25 #include <libsigrok/libsigrok.h>
  26 #include "libsigrok-internal.h"
  27 #include "dso.h"
  28
  29 #define NUM_CHANNELS 2
  30
  31 extern struct sr_dev_driver hantek_dso_driver_info;
  32
  33 static int send_begin(const struct sr_dev_inst *sdi)
  34 {
  35         struct sr_usb_dev_inst *usb;
  36         int ret;
  37         unsigned char buffer[] = {0x0f, 0x03, 0x03, 0x03, 0x68, 0xac, 0xfe,
  38         0x00, 0x01, 0x00};
  39
  40         sr_dbg("Sending CTRL_BEGINCOMMAND.");
  41
  42         usb = sdi->conn;
  43         if ((ret = libusb_control_transfer(usb->devhdl,
  44                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_BEGINCOMMAND,
  45                         0, 0, buffer, sizeof(buffer), 200)) != sizeof(buffer)) {
  46                 sr_err("Failed to send begincommand: %s.",
  47                        libusb_error_name(ret));
  48                 return SR_ERR;
  49         }
  50
  51         return SR_OK;
  52 }
  53
  54 static int send_bulkcmd(const struct sr_dev_inst *sdi, uint8_t *cmdstring, int cmdlen)
  55 {
  56         struct sr_usb_dev_inst *usb;
  57         int ret, tmp;
  58
  59         usb = sdi->conn;
  60
  61         if (send_begin(sdi) != SR_OK)
  62                 return SR_ERR;
  63
  64         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT, cmdstring,
  65                         cmdlen, &tmp, 200)) != 0)
  66                 return SR_ERR;
  67
  68         return SR_OK;
  69 }
  70
  71 static int dso_getmps(libusb_device *dev)
  72 {
  73         struct libusb_device_descriptor des;
  74         struct libusb_config_descriptor *conf_dsc;
  75         const struct libusb_interface_descriptor *intf_dsc;
  76         int mps;
  77
  78         if (libusb_get_device_descriptor(dev, &des) != 0)
  79                 return 0;
  80
  81         if (des.bNumConfigurations != 1)
  82                 return 0;
  83
  84         if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
  85                 return 0;
  86
  87         mps = 0;
  88         intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
  89         if (intf_dsc->bNumEndpoints != 2)
  90                 goto err;
  91
  92         if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
  93             (2 | LIBUSB_ENDPOINT_OUT))
  94                 /* The first endpoint should be 2 (outbound). */
  95                 goto err;
  96
  97         if ((intf_dsc->endpoint[1].bEndpointAddress & 0x8f) !=
  98             (6 | LIBUSB_ENDPOINT_IN))
  99                 /* The second endpoint should be 6 (inbound). */
 100                 goto err;
 101
 102         mps = intf_dsc->endpoint[1].wMaxPacketSize;
 103
 104 err:
 105         if (conf_dsc)
 106                 libusb_free_config_descriptor(conf_dsc);
 107
 108         return mps;
 109 }
 110
 111 SR_PRIV int dso_open(struct sr_dev_inst *sdi)
 112 {
 113         struct dev_context *devc;
 114         struct drv_context *drvc = hantek_dso_driver_info.context;
 115         struct sr_usb_dev_inst *usb;
 116         struct libusb_device_descriptor des;
 117         libusb_device **devlist;
 118         int err, i;
 119         char connection_id[64];
 120
 121         devc = sdi->priv;
 122         usb = sdi->conn;
 123
 124         if (sdi->status == SR_ST_ACTIVE)
 125                 /* already in use */
 126                 return SR_ERR;
 127
 128         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 129         for (i = 0; devlist[i]; i++) {
 130                 if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
 131                         sr_err("Failed to get device descriptor: %s.",
 132                                libusb_error_name(err));
 133                         continue;
 134                 }
 135
 136                 if (des.idVendor != devc->profile->fw_vid
 137                     || des.idProduct != devc->profile->fw_pid)
 138                         continue;
 139
 140                 if ((sdi->status == SR_ST_INITIALIZING) ||
 141                                 (sdi->status == SR_ST_INACTIVE)) {
 142                         /*
 143                          * Check device by its physical USB bus/port address.
 144                          */
 145                         usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 146                         if (strcmp(sdi->connection_id, connection_id))
 147                                 /* This is not the one. */
 148                                 continue;
 149                 }
 150
 151                 if (!(err = libusb_open(devlist[i], &usb->devhdl))) {
 152                         if (usb->address == 0xff)
 153                                 /*
 154                                  * first time we touch this device after firmware upload,
 155                                  * so we don't know the address yet.
 156                                  */
 157                                 usb->address = libusb_get_device_address(devlist[i]);
 158
 159                         if (!(devc->epin_maxpacketsize = dso_getmps(devlist[i])))
 160                                 sr_err("Wrong endpoint profile.");
 161                         else {
 162                                 sdi->status = SR_ST_ACTIVE;
 163                                 sr_info("Opened device on %d.%d (logical) / "
 164                                                 "%s (physical) interface %d.",
 165                                         usb->bus, usb->address,
 166                                         sdi->connection_id, USB_INTERFACE);
 167                         }
 168                 } else {
 169                         sr_err("Failed to open device: %s.",
 170                                libusb_error_name(err));
 171                 }
 172
 173                 /* If we made it here, we handled the device (somehow). */
 174                 break;
 175         }
 176         libusb_free_device_list(devlist, 1);
 177
 178         if (sdi->status != SR_ST_ACTIVE)
 179                 return SR_ERR;
 180
 181         return SR_OK;
 182 }
 183
 184 SR_PRIV void dso_close(struct sr_dev_inst *sdi)
 185 {
 186         struct sr_usb_dev_inst *usb;
 187
 188         usb = sdi->conn;
 189
 190         if (!usb->devhdl)
 191                 return;
 192
 193         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 194                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 195         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 196         libusb_close(usb->devhdl);
 197         usb->devhdl = NULL;
 198         sdi->status = SR_ST_INACTIVE;
 199
 200 }
 201
 202 static int get_channel_offsets(const struct sr_dev_inst *sdi)
 203 {
 204         struct dev_context *devc;
 205         struct sr_usb_dev_inst *usb;
 206         GString *gs;
 207         int chan, v, ret;
 208
 209         sr_dbg("Getting channel offsets.");
 210
 211         devc = sdi->priv;
 212         usb = sdi->conn;
 213
 214         ret = libusb_control_transfer(usb->devhdl,
 215                         LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_VENDOR,
 216                         CTRL_READ_EEPROM, EEPROM_CHANNEL_OFFSETS, 0,
 217                         (unsigned char *)&devc->channel_levels,
 218                         sizeof(devc->channel_levels), 200);
 219         if (ret != sizeof(devc->channel_levels)) {
 220                 sr_err("Failed to get channel offsets: %s.",
 221                        libusb_error_name(ret));
 222                 return SR_ERR;
 223         }
 224
 225         /* Comes in as 16-bit numbers with the second byte always 0 on
 226          * the DSO-2090. Guessing this is supposed to be big-endian,
 227          * since that's how voltage offsets are submitted back to the DSO.
 228          * Convert to host order now, so we can use them natively.
 229          */
 230         for (chan = 0; chan < NUM_CHANNELS; chan++) {
 231                 for (v = 0; v < 9; v++) {
 232                         devc->channel_levels[chan][v][0] =
 233                                 g_ntohs(devc->channel_levels[chan][v][0]);
 234                         devc->channel_levels[chan][v][1] =
 235                                 g_ntohs(devc->channel_levels[chan][v][1]);
 236                 }
 237         }
 238
 239         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 240                 gs = g_string_sized_new(128);
 241                 for (chan = 0; chan < NUM_CHANNELS; chan++) {
 242                         g_string_printf(gs, "CH%d:", chan + 1);
 243                         for (v = 0; v < 9; v++) {
 244                                 g_string_append_printf(gs, " %.4x-%.4x",
 245                                         devc->channel_levels[chan][v][0],
 246                                         devc->channel_levels[chan][v][1]);
 247                         }
 248                         sr_dbg("%s", gs->str);
 249                 }
 250                 g_string_free(gs, TRUE);
 251         }
 252
 253         return SR_OK;
 254 }
 255
 256 static int dso_set_trigger_samplerate(const struct sr_dev_inst *sdi)
 257 {
 258         struct dev_context *devc;
 259         struct sr_usb_dev_inst *usb;
 260         int ret, tmp;
 261         uint8_t cmdstring[12];
 262         uint16_t timebase_small[] = { 0xffff, 0xfffc, 0xfff7, 0xffe8, 0xffce,
 263                 0xff9c, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79, 0xd8f1 };
 264         uint16_t timebase_large[] = { 0xffff, 0x0000, 0xfffc, 0xfff7, 0xffe8,
 265                 0xffce, 0xff9d, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79 };
 266
 267         sr_dbg("Preparing CMD_SET_TRIGGER_SAMPLERATE.");
 268
 269         devc = sdi->priv;
 270         usb = sdi->conn;
 271
 272         memset(cmdstring, 0, sizeof(cmdstring));
 273         /* Command */
 274         cmdstring[0] = CMD_SET_TRIGGER_SAMPLERATE;
 275
 276         /* Trigger source */
 277         sr_dbg("Trigger source %s.", devc->triggersource);
 278         if (!strcmp("CH2", devc->triggersource))
 279                 tmp = 0;
 280         else if (!strcmp("CH1", devc->triggersource))
 281                 tmp = 1;
 282         else if (!strcmp("EXT", devc->triggersource))
 283                 tmp = 2;
 284         else {
 285                 sr_err("Invalid trigger source: '%s'.", devc->triggersource);
 286                 return SR_ERR_ARG;
 287         }
 288         cmdstring[2] = tmp;
 289
 290         /* Frame size */
 291         sr_dbg("Frame size: %d.", devc->framesize);
 292         cmdstring[2] |= (devc->framesize == FRAMESIZE_SMALL ? 0x01 : 0x02) << 2;
 293
 294         /* Timebase fast */
 295         sr_dbg("Time base index: %d.", devc->timebase);
 296         if (devc->framesize == FRAMESIZE_SMALL) {
 297                 if (devc->timebase < TIME_20us)
 298                         tmp = 0;
 299                 else if (devc->timebase == TIME_20us)
 300                         tmp = 1;
 301                 else if (devc->timebase == TIME_40us)
 302                         tmp = 2;
 303                 else if (devc->timebase == TIME_100us)
 304                         tmp = 3;
 305                 else if (devc->timebase >= TIME_200us)
 306                         tmp = 4;
 307         } else {
 308                 if (devc->timebase < TIME_40us) {
 309                         sr_err("Timebase < 40us only supported with 10K buffer.");
 310                         return SR_ERR_ARG;
 311                 }
 312                 else if (devc->timebase == TIME_40us)
 313                         tmp = 0;
 314                 else if (devc->timebase == TIME_100us)
 315                         tmp = 2;
 316                 else if (devc->timebase == TIME_200us)
 317                         tmp = 3;
 318                 else if (devc->timebase >= TIME_400us)
 319                         tmp = 4;
 320         }
 321         cmdstring[2] |= (tmp & 0x07) << 5;
 322
 323         /* Enabled channels: 00=CH1 01=CH2 10=both */
 324         sr_dbg("Channels CH1=%d CH2=%d", devc->ch1_enabled, devc->ch2_enabled);
 325         tmp = (((devc->ch2_enabled ? 1 : 0) << 1) + (devc->ch1_enabled ? 1 : 0)) - 1;
 326         cmdstring[3] = tmp;
 327
 328         /* Fast rates channel */
 329         /* TODO: Is this right? */
 330         tmp = devc->timebase < TIME_10us ? 1 : 0;
 331         cmdstring[3] |= tmp << 2;
 332
 333         /* Trigger slope: 0=positive 1=negative */
 334         /* TODO: Does this work? */
 335         sr_dbg("Trigger slope: %d.", devc->triggerslope);
 336         cmdstring[3] |= (devc->triggerslope == SLOPE_NEGATIVE ? 1 : 0) << 3;
 337
 338         /* Timebase slow */
 339         if (devc->timebase < TIME_100us)
 340                 tmp = 0;
 341         else if (devc->timebase > TIME_400ms)
 342                 tmp = 0xffed;
 343         else {
 344                 if (devc->framesize == FRAMESIZE_SMALL)
 345                         tmp = timebase_small[devc->timebase - 3];
 346                 else
 347                         tmp = timebase_large[devc->timebase - 3];
 348         }
 349         cmdstring[4] = tmp & 0xff;
 350         cmdstring[5] = (tmp >> 8) & 0xff;
 351
 352         /* Horizontal trigger position */
 353         sr_dbg("Trigger position: %3.2f.", devc->triggerposition);
 354         tmp = 0x77fff + 0x8000 * devc->triggerposition;
 355         cmdstring[6] = tmp & 0xff;
 356         cmdstring[7] = (tmp >> 8) & 0xff;
 357         cmdstring[10] = (tmp >> 16) & 0xff;
 358
 359         if (send_begin(sdi) != SR_OK)
 360                 return SR_ERR;
 361
 362         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 363                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 364                 sr_err("Failed to set trigger/samplerate: %s.",
 365                        libusb_error_name(ret));
 366                 return SR_ERR;
 367         }
 368         sr_dbg("Sent CMD_SET_TRIGGER_SAMPLERATE.");
 369
 370         return SR_OK;
 371 }
 372
 373 static int dso_set_filters(const struct sr_dev_inst *sdi)
 374 {
 375         struct dev_context *devc;
 376         struct sr_usb_dev_inst *usb;
 377         int ret, tmp;
 378         uint8_t cmdstring[8];
 379
 380         sr_dbg("Preparing CMD_SET_FILTERS.");
 381
 382         devc = sdi->priv;
 383         usb = sdi->conn;
 384
 385         memset(cmdstring, 0, sizeof(cmdstring));
 386         cmdstring[0] = CMD_SET_FILTERS;
 387         cmdstring[1] = 0x0f;
 388         if (devc->filter[0]) {
 389                 sr_dbg("Turning on CH1 filter.");
 390                 cmdstring[2] |= 0x80;
 391         }
 392         if (devc->filter[1]) {
 393                 sr_dbg("Turning on CH2 filter.");
 394                 cmdstring[2] |= 0x40;
 395         }
 396         /*
 397          * Not supported: filtering on the trigger
 398          * cmdstring[2] |= 0x20;
 399          */
 400
 401         if (send_begin(sdi) != SR_OK)
 402                 return SR_ERR;
 403
 404         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 405                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 406                 sr_err("Failed to set filters: %s.", libusb_error_name(ret));
 407                 return SR_ERR;
 408         }
 409         sr_dbg("Sent CMD_SET_FILTERS.");
 410
 411         return SR_OK;
 412 }
 413
 414 static int dso_set_voltage(const struct sr_dev_inst *sdi)
 415 {
 416         struct dev_context *devc;
 417         struct sr_usb_dev_inst *usb;
 418         int ret, tmp;
 419         uint8_t cmdstring[8];
 420
 421         sr_dbg("Preparing CMD_SET_VOLTAGE.");
 422
 423         devc = sdi->priv;
 424         usb = sdi->conn;
 425
 426         memset(cmdstring, 0, sizeof(cmdstring));
 427         cmdstring[0] = CMD_SET_VOLTAGE;
 428         cmdstring[1] = 0x0f;
 429         cmdstring[2] = 0x30;
 430
 431         /* CH1 volts/div is encoded in bits 0-1 */
 432         sr_dbg("CH1 vdiv index: %d.", devc->voltage[0]);
 433         switch (devc->voltage[0]) {
 434         case VDIV_1V:
 435         case VDIV_100MV:
 436         case VDIV_10MV:
 437                 cmdstring[2] |= 0x00;
 438                 break;
 439         case VDIV_2V:
 440         case VDIV_200MV:
 441         case VDIV_20MV:
 442                 cmdstring[2] |= 0x01;
 443                 break;
 444         case VDIV_5V:
 445         case VDIV_500MV:
 446         case VDIV_50MV:
 447                 cmdstring[2] |= 0x02;
 448                 break;
 449         }
 450
 451         /* CH2 volts/div is encoded in bits 2-3 */
 452         sr_dbg("CH2 vdiv index: %d.", devc->voltage[1]);
 453         switch (devc->voltage[1]) {
 454         case VDIV_1V:
 455         case VDIV_100MV:
 456         case VDIV_10MV:
 457                 cmdstring[2] |= 0x00;
 458                 break;
 459         case VDIV_2V:
 460         case VDIV_200MV:
 461         case VDIV_20MV:
 462                 cmdstring[2] |= 0x04;
 463                 break;
 464         case VDIV_5V:
 465         case VDIV_500MV:
 466         case VDIV_50MV:
 467                 cmdstring[2] |= 0x08;
 468                 break;
 469         }
 470
 471         if (send_begin(sdi) != SR_OK)
 472                 return SR_ERR;
 473
 474         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 475                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 476                 sr_err("Failed to set voltage: %s.", libusb_error_name(ret));
 477                 return SR_ERR;
 478         }
 479         sr_dbg("Sent CMD_SET_VOLTAGE.");
 480
 481         return SR_OK;
 482 }
 483
 484 static int dso_set_relays(const struct sr_dev_inst *sdi)
 485 {
 486         struct dev_context *devc;
 487         struct sr_usb_dev_inst *usb;
 488         GString *gs;
 489         int ret, i;
 490         uint8_t relays[17] = { 0x00, 0x04, 0x08, 0x02, 0x20, 0x40, 0x10, 0x01,
 491                         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 492
 493         sr_dbg("Preparing CTRL_SETRELAYS.");
 494
 495         devc = sdi->priv;
 496         usb = sdi->conn;
 497
 498         if (devc->voltage[0] < VDIV_1V)
 499                 relays[1] = ~relays[1];
 500
 501         if (devc->voltage[0] < VDIV_100MV)
 502                 relays[2] = ~relays[2];
 503
 504         sr_dbg("CH1 coupling: %d.", devc->coupling[0]);
 505         if (devc->coupling[0] != COUPLING_AC)
 506                 relays[3] = ~relays[3];
 507
 508         if (devc->voltage[1] < VDIV_1V)
 509                 relays[4] = ~relays[4];
 510
 511         if (devc->voltage[1] < VDIV_100MV)
 512                 relays[5] = ~relays[5];
 513
 514         sr_dbg("CH2 coupling: %d.", devc->coupling[1]);
 515         if (devc->coupling[1] != COUPLING_AC)
 516                 relays[6] = ~relays[6];
 517
 518         if (!strcmp(devc->triggersource, "EXT"))
 519                 relays[7] = ~relays[7];
 520
 521         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 522                 gs = g_string_sized_new(128);
 523                 g_string_printf(gs, "Relays:");
 524                 for (i = 0; i < 17; i++)
 525                         g_string_append_printf(gs, " %.2x", relays[i]);
 526                 sr_dbg("%s", gs->str);
 527                 g_string_free(gs, TRUE);
 528         }
 529
 530         if ((ret = libusb_control_transfer(usb->devhdl,
 531                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETRELAYS,
 532                         0, 0, relays, 17, 100)) != sizeof(relays)) {
 533                 sr_err("Failed to set relays: %s.", libusb_error_name(ret));
 534                 return SR_ERR;
 535         }
 536         sr_dbg("Sent CTRL_SETRELAYS.");
 537
 538         return SR_OK;
 539 }
 540
 541 static int dso_set_voffsets(const struct sr_dev_inst *sdi)
 542 {
 543         struct dev_context *devc;
 544         struct sr_usb_dev_inst *usb;
 545         int offset, ret;
 546         uint16_t *ch_levels;
 547         uint8_t offsets[17];
 548
 549         sr_dbg("Preparing CTRL_SETOFFSET.");
 550
 551         devc = sdi->priv;
 552         usb = sdi->conn;
 553
 554         memset(offsets, 0, sizeof(offsets));
 555         /* Channel 1 */
 556         ch_levels = devc->channel_levels[0][devc->voltage[0]];
 557         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch1 + ch_levels[0];
 558         offsets[0] = (offset >> 8) | 0x20;
 559         offsets[1] = offset & 0xff;
 560         sr_dbg("CH1 offset: %3.2f (%.2x%.2x).", devc->voffset_ch1,
 561                offsets[0], offsets[1]);
 562
 563         /* Channel 2 */
 564         ch_levels = devc->channel_levels[1][devc->voltage[1]];
 565         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch2 + ch_levels[0];
 566         offsets[2] = (offset >> 8) | 0x20;
 567         offsets[3] = offset & 0xff;
 568         sr_dbg("CH2 offset: %3.2f (%.2x%.2x).", devc->voffset_ch2,
 569                offsets[2], offsets[3]);
 570
 571         /* Trigger */
 572         offset = MAX_VERT_TRIGGER * devc->voffset_trigger;
 573         offsets[4] = (offset >> 8) | 0x20;
 574         offsets[5] = offset & 0xff;
 575         sr_dbg("Trigger offset: %3.2f (%.2x%.2x).", devc->voffset_trigger,
 576                         offsets[4], offsets[5]);
 577
 578         if ((ret = libusb_control_transfer(usb->devhdl,
 579                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETOFFSET,
 580                         0, 0, offsets, sizeof(offsets), 100)) != sizeof(offsets)) {
 581                 sr_err("Failed to set offsets: %s.", libusb_error_name(ret));
 582                 return SR_ERR;
 583         }
 584         sr_dbg("Sent CTRL_SETOFFSET.");
 585
 586         return SR_OK;
 587 }
 588
 589 SR_PRIV int dso_enable_trigger(const struct sr_dev_inst *sdi)
 590 {
 591         struct sr_usb_dev_inst *usb;
 592         int ret, tmp;
 593         uint8_t cmdstring[2];
 594
 595         sr_dbg("Sending CMD_ENABLE_TRIGGER.");
 596
 597         usb = sdi->conn;
 598
 599         memset(cmdstring, 0, sizeof(cmdstring));
 600         cmdstring[0] = CMD_ENABLE_TRIGGER;
 601         cmdstring[1] = 0x00;
 602
 603         if (send_begin(sdi) != SR_OK)
 604                 return SR_ERR;
 605
 606         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 607                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 608                 sr_err("Failed to enable trigger: %s.", libusb_error_name(ret));
 609                 return SR_ERR;
 610         }
 611
 612         return SR_OK;
 613 }
 614
 615 SR_PRIV int dso_force_trigger(const struct sr_dev_inst *sdi)
 616 {
 617         struct sr_usb_dev_inst *usb;
 618         int ret, tmp;
 619         uint8_t cmdstring[2];
 620
 621         sr_dbg("Sending CMD_FORCE_TRIGGER.");
 622
 623         usb = sdi->conn;
 624
 625         memset(cmdstring, 0, sizeof(cmdstring));
 626         cmdstring[0] = CMD_FORCE_TRIGGER;
 627         cmdstring[1] = 0x00;
 628
 629         if (send_begin(sdi) != SR_OK)
 630                 return SR_ERR;
 631
 632         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 633                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 634                 sr_err("Failed to force trigger: %s.", libusb_error_name(ret));
 635                 return SR_ERR;
 636         }
 637
 638         return SR_OK;
 639 }
 640
 641 SR_PRIV int dso_init(const struct sr_dev_inst *sdi)
 642 {
 643
 644         sr_dbg("Initializing DSO.");
 645
 646         if (get_channel_offsets(sdi) != SR_OK)
 647                 return SR_ERR;
 648
 649         if (dso_set_trigger_samplerate(sdi) != SR_OK)
 650                 return SR_ERR;
 651
 652         if (dso_set_filters(sdi) != SR_OK)
 653                 return SR_ERR;
 654
 655         if (dso_set_voltage(sdi) != SR_OK)
 656                 return SR_ERR;
 657
 658         if (dso_set_relays(sdi) != SR_OK)
 659                 return SR_ERR;
 660
 661         if (dso_set_voffsets(sdi) != SR_OK)
 662                 return SR_ERR;
 663
 664         if (dso_enable_trigger(sdi) != SR_OK)
 665                 return SR_ERR;
 666
 667         return SR_OK;
 668 }
 669
 670 SR_PRIV int dso_get_capturestate(const struct sr_dev_inst *sdi,
 671                 uint8_t *capturestate, uint32_t *trigger_offset)
 672 {
 673         struct sr_usb_dev_inst *usb;
 674         int ret, tmp, i;
 675         unsigned int bitvalue, toff;
 676         uint8_t cmdstring[2], inbuf[512];
 677
 678         sr_dbg("Sending CMD_GET_CAPTURESTATE.");
 679
 680         usb = sdi->conn;
 681
 682         cmdstring[0] = CMD_GET_CAPTURESTATE;
 683         cmdstring[1] = 0;
 684
 685         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 686                 sr_dbg("Failed to send get_capturestate command: %s.",
 687                        libusb_error_name(ret));
 688                 return SR_ERR;
 689         }
 690
 691         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_IN,
 692                         inbuf, 512, &tmp, 100)) != 0) {
 693                 sr_dbg("Failed to get capturestate: %s.",
 694                        libusb_error_name(ret));
 695                 return SR_ERR;
 696         }
 697         *capturestate = inbuf[0];
 698         toff = (inbuf[1] << 16) | (inbuf[3] << 8) | inbuf[2];
 699
 700         /*
 701          * This conversion comes from the openhantek project.
 702          * Each set bit in the 24-bit value inverts all bits with a lower
 703          * value. No idea why the device reports the trigger point this way.
 704          */
 705         bitvalue = 1;
 706         for (i = 0; i < 24; i++) {
 707                 /* Each set bit inverts all bits with a lower value. */
 708                 if (toff & bitvalue)
 709                         toff ^= bitvalue - 1;
 710                 bitvalue <<= 1;
 711         }
 712         *trigger_offset = toff;
 713
 714         return SR_OK;
 715 }
 716
 717 SR_PRIV int dso_capture_start(const struct sr_dev_inst *sdi)
 718 {
 719         int ret;
 720         uint8_t cmdstring[2];
 721
 722         sr_dbg("Sending CMD_CAPTURE_START.");
 723
 724         cmdstring[0] = CMD_CAPTURE_START;
 725         cmdstring[1] = 0;
 726
 727         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 728                 sr_err("Failed to send capture_start command: %s.",
 729                        libusb_error_name(ret));
 730                 return SR_ERR;
 731         }
 732
 733         return SR_OK;
 734 }
 735
 736 SR_PRIV int dso_get_channeldata(const struct sr_dev_inst *sdi,
 737                 libusb_transfer_cb_fn cb)
 738 {
 739         struct dev_context *devc;
 740         struct sr_usb_dev_inst *usb;
 741         struct libusb_transfer *transfer;
 742         int num_transfers, ret, i;
 743         uint8_t cmdstring[2];
 744         unsigned char *buf;
 745
 746         sr_dbg("Sending CMD_GET_CHANNELDATA.");
 747
 748         devc = sdi->priv;
 749         usb = sdi->conn;
 750
 751         cmdstring[0] = CMD_GET_CHANNELDATA;
 752         cmdstring[1] = 0;
 753
 754         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 755                 sr_err("Failed to get channel data: %s.",
 756                        libusb_error_name(ret));
 757                 return SR_ERR;
 758         }
 759
 760         /* TODO: DSO-2xxx only. */
 761         num_transfers = devc->framesize *
 762                         sizeof(unsigned short) / devc->epin_maxpacketsize;
 763         sr_dbg("Queueing up %d transfers.", num_transfers);
 764         for (i = 0; i < num_transfers; i++) {
 765                 if (!(buf = g_try_malloc(devc->epin_maxpacketsize))) {
 766                         sr_err("Failed to malloc USB endpoint buffer.");
 767                         return SR_ERR_MALLOC;
 768                 }
 769                 transfer = libusb_alloc_transfer(0);
 770                 libusb_fill_bulk_transfer(transfer, usb->devhdl, DSO_EP_IN, buf,
 771                                 devc->epin_maxpacketsize, cb, (void *)sdi, 40);
 772                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 773                         sr_err("Failed to submit transfer: %s.",
 774                                libusb_error_name(ret));
 775                         /* TODO: Free them all. */
 776                         libusb_free_transfer(transfer);
 777                         g_free(buf);
 778                         return SR_ERR;
 779                 }
 780         }
 781
 782         return SR_OK;
 783 }