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 <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 "dso.h"
  29
  30 #define NUM_CHANNELS 2
  31
  32 extern struct sr_dev_driver hantek_dso_driver_info;
  33
  34 static int send_begin(const struct sr_dev_inst *sdi)
  35 {
  36         struct sr_usb_dev_inst *usb;
  37         int ret;
  38         unsigned char buffer[] = {0x0f, 0x03, 0x03, 0x03, 0x68, 0xac, 0xfe,
  39         0x00, 0x01, 0x00};
  40
  41         sr_dbg("Sending CTRL_BEGINCOMMAND.");
  42
  43         usb = sdi->conn;
  44         if ((ret = libusb_control_transfer(usb->devhdl,
  45                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_BEGINCOMMAND,
  46                         0, 0, buffer, sizeof(buffer), 200)) != sizeof(buffer)) {
  47                 sr_err("Failed to send begincommand: %s.",
  48                        libusb_error_name(ret));
  49                 return SR_ERR;
  50         }
  51
  52         return SR_OK;
  53 }
  54
  55 static int send_bulkcmd(const struct sr_dev_inst *sdi, uint8_t *cmdstring, int cmdlen)
  56 {
  57         struct sr_usb_dev_inst *usb;
  58         int ret, tmp;
  59
  60         usb = sdi->conn;
  61
  62         if (send_begin(sdi) != SR_OK)
  63                 return SR_ERR;
  64
  65         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT, cmdstring,
  66                         cmdlen, &tmp, 200)) != 0)
  67                 return SR_ERR;
  68
  69         return SR_OK;
  70 }
  71
  72 static int dso_getmps(libusb_device *dev)
  73 {
  74         struct libusb_device_descriptor des;
  75         struct libusb_config_descriptor *conf_dsc;
  76         const struct libusb_interface_descriptor *intf_dsc;
  77         int mps;
  78
  79         if (libusb_get_device_descriptor(dev, &des) != 0)
  80                 return 0;
  81
  82         if (des.bNumConfigurations != 1)
  83                 return 0;
  84
  85         if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
  86                 return 0;
  87
  88         mps = 0;
  89         intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
  90         if (intf_dsc->bNumEndpoints != 2)
  91                 goto err;
  92
  93         if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
  94             (2 | LIBUSB_ENDPOINT_OUT))
  95                 /* The first endpoint should be 2 (outbound). */
  96                 goto err;
  97
  98         if ((intf_dsc->endpoint[1].bEndpointAddress & 0x8f) !=
  99             (6 | LIBUSB_ENDPOINT_IN))
 100                 /* The second endpoint should be 6 (inbound). */
 101                 goto err;
 102
 103         mps = intf_dsc->endpoint[1].wMaxPacketSize;
 104
 105 err:
 106         if (conf_dsc)
 107                 libusb_free_config_descriptor(conf_dsc);
 108
 109         return mps;
 110 }
 111
 112 SR_PRIV int dso_open(struct sr_dev_inst *sdi)
 113 {
 114         struct dev_context *devc;
 115         struct drv_context *drvc = hantek_dso_driver_info.context;
 116         struct sr_usb_dev_inst *usb;
 117         struct libusb_device_descriptor des;
 118         libusb_device **devlist;
 119         int err, i;
 120         char connection_id[64];
 121
 122         devc = sdi->priv;
 123         usb = sdi->conn;
 124
 125         if (sdi->status == SR_ST_ACTIVE)
 126                 /* already in use */
 127                 return SR_ERR;
 128
 129         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 130         for (i = 0; devlist[i]; i++) {
 131                 if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
 132                         sr_err("Failed to get device descriptor: %s.",
 133                                libusb_error_name(err));
 134                         continue;
 135                 }
 136
 137                 if (des.idVendor != devc->profile->fw_vid
 138                     || des.idProduct != devc->profile->fw_pid)
 139                         continue;
 140
 141                 if ((sdi->status == SR_ST_INITIALIZING) ||
 142                                 (sdi->status == SR_ST_INACTIVE)) {
 143                         /*
 144                          * Check device by its physical USB bus/port address.
 145                          */
 146                         usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 147                         if (strcmp(sdi->connection_id, connection_id))
 148                                 /* This is not the one. */
 149                                 continue;
 150                 }
 151
 152                 if (!(err = libusb_open(devlist[i], &usb->devhdl))) {
 153                         if (usb->address == 0xff)
 154                                 /*
 155                                  * first time we touch this device after firmware upload,
 156                                  * so we don't know the address yet.
 157                                  */
 158                                 usb->address = libusb_get_device_address(devlist[i]);
 159
 160                         if (!(devc->epin_maxpacketsize = dso_getmps(devlist[i])))
 161                                 sr_err("Wrong endpoint profile.");
 162                         else {
 163                                 sdi->status = SR_ST_ACTIVE;
 164                                 sr_info("Opened device on %d.%d (logical) / "
 165                                                 "%s (physical) interface %d.",
 166                                         usb->bus, usb->address,
 167                                         sdi->connection_id, USB_INTERFACE);
 168                         }
 169                 } else {
 170                         sr_err("Failed to open device: %s.",
 171                                libusb_error_name(err));
 172                 }
 173
 174                 /* If we made it here, we handled the device (somehow). */
 175                 break;
 176         }
 177         libusb_free_device_list(devlist, 1);
 178
 179         if (sdi->status != SR_ST_ACTIVE)
 180                 return SR_ERR;
 181
 182         return SR_OK;
 183 }
 184
 185 SR_PRIV void dso_close(struct sr_dev_inst *sdi)
 186 {
 187         struct sr_usb_dev_inst *usb;
 188
 189         usb = sdi->conn;
 190
 191         if (!usb->devhdl)
 192                 return;
 193
 194         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 195                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 196         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 197         libusb_close(usb->devhdl);
 198         usb->devhdl = NULL;
 199         sdi->status = SR_ST_INACTIVE;
 200
 201 }
 202
 203 static int get_channel_offsets(const struct sr_dev_inst *sdi)
 204 {
 205         struct dev_context *devc;
 206         struct sr_usb_dev_inst *usb;
 207         GString *gs;
 208         int chan, v, ret;
 209
 210         sr_dbg("Getting channel offsets.");
 211
 212         devc = sdi->priv;
 213         usb = sdi->conn;
 214
 215         ret = libusb_control_transfer(usb->devhdl,
 216                         LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_VENDOR,
 217                         CTRL_READ_EEPROM, EEPROM_CHANNEL_OFFSETS, 0,
 218                         (unsigned char *)&devc->channel_levels,
 219                         sizeof(devc->channel_levels), 200);
 220         if (ret != sizeof(devc->channel_levels)) {
 221                 sr_err("Failed to get channel offsets: %s.",
 222                        libusb_error_name(ret));
 223                 return SR_ERR;
 224         }
 225
 226         /* Comes in as 16-bit numbers with the second byte always 0 on
 227          * the DSO-2090. Guessing this is supposed to be big-endian,
 228          * since that's how voltage offsets are submitted back to the DSO.
 229          * Convert to host order now, so we can use them natively.
 230          */
 231         for (chan = 0; chan < NUM_CHANNELS; chan++) {
 232                 for (v = 0; v < 9; v++) {
 233                         devc->channel_levels[chan][v][0] =
 234                                 g_ntohs(devc->channel_levels[chan][v][0]);
 235                         devc->channel_levels[chan][v][1] =
 236                                 g_ntohs(devc->channel_levels[chan][v][1]);
 237                 }
 238         }
 239
 240         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 241                 gs = g_string_sized_new(128);
 242                 for (chan = 0; chan < NUM_CHANNELS; chan++) {
 243                         g_string_printf(gs, "CH%d:", chan + 1);
 244                         for (v = 0; v < 9; v++) {
 245                                 g_string_append_printf(gs, " %.4x-%.4x",
 246                                         devc->channel_levels[chan][v][0],
 247                                         devc->channel_levels[chan][v][1]);
 248                         }
 249                         sr_dbg("%s", gs->str);
 250                 }
 251                 g_string_free(gs, TRUE);
 252         }
 253
 254         return SR_OK;
 255 }
 256
 257 static int dso_set_trigger_samplerate(const struct sr_dev_inst *sdi)
 258 {
 259         struct dev_context *devc;
 260         struct sr_usb_dev_inst *usb;
 261         int ret, tmp;
 262         uint8_t cmdstring[12];
 263         uint16_t timebase_small[] = { 0xffff, 0xfffc, 0xfff7, 0xffe8, 0xffce,
 264                 0xff9c, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79, 0xd8f1 };
 265         uint16_t timebase_large[] = { 0xffff, 0x0000, 0xfffc, 0xfff7, 0xffe8,
 266                 0xffce, 0xff9d, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79 };
 267
 268         sr_dbg("Preparing CMD_SET_TRIGGER_SAMPLERATE.");
 269
 270         devc = sdi->priv;
 271         usb = sdi->conn;
 272
 273         memset(cmdstring, 0, sizeof(cmdstring));
 274         /* Command */
 275         cmdstring[0] = CMD_SET_TRIGGER_SAMPLERATE;
 276
 277         /* Trigger source */
 278         sr_dbg("Trigger source %s.", devc->triggersource);
 279         if (!strcmp("CH2", devc->triggersource))
 280                 tmp = 0;
 281         else if (!strcmp("CH1", devc->triggersource))
 282                 tmp = 1;
 283         else if (!strcmp("EXT", devc->triggersource))
 284                 tmp = 2;
 285         else {
 286                 sr_err("Invalid trigger source: '%s'.", devc->triggersource);
 287                 return SR_ERR_ARG;
 288         }
 289         cmdstring[2] = tmp;
 290
 291         /* Frame size */
 292         sr_dbg("Frame size: %d.", devc->framesize);
 293         cmdstring[2] |= (devc->framesize == FRAMESIZE_SMALL ? 0x01 : 0x02) << 2;
 294
 295         /* Timebase fast */
 296         sr_dbg("Time base index: %d.", devc->timebase);
 297         if (devc->framesize == FRAMESIZE_SMALL) {
 298                 if (devc->timebase < TIME_20us)
 299                         tmp = 0;
 300                 else if (devc->timebase == TIME_20us)
 301                         tmp = 1;
 302                 else if (devc->timebase == TIME_40us)
 303                         tmp = 2;
 304                 else if (devc->timebase == TIME_100us)
 305                         tmp = 3;
 306                 else if (devc->timebase >= TIME_200us)
 307                         tmp = 4;
 308         } else {
 309                 if (devc->timebase < TIME_40us) {
 310                         sr_err("Timebase < 40us only supported with 10K buffer.");
 311                         return SR_ERR_ARG;
 312                 }
 313                 else if (devc->timebase == TIME_40us)
 314                         tmp = 0;
 315                 else if (devc->timebase == TIME_100us)
 316                         tmp = 2;
 317                 else if (devc->timebase == TIME_200us)
 318                         tmp = 3;
 319                 else if (devc->timebase >= TIME_400us)
 320                         tmp = 4;
 321         }
 322         cmdstring[2] |= (tmp & 0x07) << 5;
 323
 324         /* Enabled channels: 00=CH1 01=CH2 10=both */
 325         sr_dbg("Channels CH1=%d CH2=%d", devc->ch1_enabled, devc->ch2_enabled);
 326         tmp = (((devc->ch2_enabled ? 1 : 0) << 1) + (devc->ch1_enabled ? 1 : 0)) - 1;
 327         cmdstring[3] = tmp;
 328
 329         /* Fast rates channel */
 330         /* TODO: Is this right? */
 331         tmp = devc->timebase < TIME_10us ? 1 : 0;
 332         cmdstring[3] |= tmp << 2;
 333
 334         /* Trigger slope: 0=positive 1=negative */
 335         /* TODO: Does this work? */
 336         sr_dbg("Trigger slope: %d.", devc->triggerslope);
 337         cmdstring[3] |= (devc->triggerslope == SLOPE_NEGATIVE ? 1 : 0) << 3;
 338
 339         /* Timebase slow */
 340         if (devc->timebase < TIME_100us)
 341                 tmp = 0;
 342         else if (devc->timebase > TIME_400ms)
 343                 tmp = 0xffed;
 344         else {
 345                 if (devc->framesize == FRAMESIZE_SMALL)
 346                         tmp = timebase_small[devc->timebase - 3];
 347                 else
 348                         tmp = timebase_large[devc->timebase - 3];
 349         }
 350         cmdstring[4] = tmp & 0xff;
 351         cmdstring[5] = (tmp >> 8) & 0xff;
 352
 353         /* Horizontal trigger position */
 354         sr_dbg("Trigger position: %3.2f.", devc->triggerposition);
 355         tmp = 0x77fff + 0x8000 * devc->triggerposition;
 356         cmdstring[6] = tmp & 0xff;
 357         cmdstring[7] = (tmp >> 8) & 0xff;
 358         cmdstring[10] = (tmp >> 16) & 0xff;
 359
 360         if (send_begin(sdi) != SR_OK)
 361                 return SR_ERR;
 362
 363         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 364                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 365                 sr_err("Failed to set trigger/samplerate: %s.",
 366                        libusb_error_name(ret));
 367                 return SR_ERR;
 368         }
 369         sr_dbg("Sent CMD_SET_TRIGGER_SAMPLERATE.");
 370
 371         return SR_OK;
 372 }
 373
 374 static int dso_set_filters(const struct sr_dev_inst *sdi)
 375 {
 376         struct dev_context *devc;
 377         struct sr_usb_dev_inst *usb;
 378         int ret, tmp;
 379         uint8_t cmdstring[8];
 380
 381         sr_dbg("Preparing CMD_SET_FILTERS.");
 382
 383         devc = sdi->priv;
 384         usb = sdi->conn;
 385
 386         memset(cmdstring, 0, sizeof(cmdstring));
 387         cmdstring[0] = CMD_SET_FILTERS;
 388         cmdstring[1] = 0x0f;
 389         if (devc->filter[0]) {
 390                 sr_dbg("Turning on CH1 filter.");
 391                 cmdstring[2] |= 0x80;
 392         }
 393         if (devc->filter[1]) {
 394                 sr_dbg("Turning on CH2 filter.");
 395                 cmdstring[2] |= 0x40;
 396         }
 397         /*
 398          * Not supported: filtering on the trigger
 399          * cmdstring[2] |= 0x20;
 400          */
 401
 402         if (send_begin(sdi) != SR_OK)
 403                 return SR_ERR;
 404
 405         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 406                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 407                 sr_err("Failed to set filters: %s.", libusb_error_name(ret));
 408                 return SR_ERR;
 409         }
 410         sr_dbg("Sent CMD_SET_FILTERS.");
 411
 412         return SR_OK;
 413 }
 414
 415 static int dso_set_voltage(const struct sr_dev_inst *sdi)
 416 {
 417         struct dev_context *devc;
 418         struct sr_usb_dev_inst *usb;
 419         int ret, tmp;
 420         uint8_t cmdstring[8];
 421
 422         sr_dbg("Preparing CMD_SET_VOLTAGE.");
 423
 424         devc = sdi->priv;
 425         usb = sdi->conn;
 426
 427         memset(cmdstring, 0, sizeof(cmdstring));
 428         cmdstring[0] = CMD_SET_VOLTAGE;
 429         cmdstring[1] = 0x0f;
 430         cmdstring[2] = 0x30;
 431
 432         /* CH1 volts/div is encoded in bits 0-1 */
 433         sr_dbg("CH1 vdiv index: %d.", devc->voltage[0]);
 434         switch (devc->voltage[0]) {
 435         case VDIV_1V:
 436         case VDIV_100MV:
 437         case VDIV_10MV:
 438                 cmdstring[2] |= 0x00;
 439                 break;
 440         case VDIV_2V:
 441         case VDIV_200MV:
 442         case VDIV_20MV:
 443                 cmdstring[2] |= 0x01;
 444                 break;
 445         case VDIV_5V:
 446         case VDIV_500MV:
 447         case VDIV_50MV:
 448                 cmdstring[2] |= 0x02;
 449                 break;
 450         }
 451
 452         /* CH2 volts/div is encoded in bits 2-3 */
 453         sr_dbg("CH2 vdiv index: %d.", devc->voltage[1]);
 454         switch (devc->voltage[1]) {
 455         case VDIV_1V:
 456         case VDIV_100MV:
 457         case VDIV_10MV:
 458                 cmdstring[2] |= 0x00;
 459                 break;
 460         case VDIV_2V:
 461         case VDIV_200MV:
 462         case VDIV_20MV:
 463                 cmdstring[2] |= 0x04;
 464                 break;
 465         case VDIV_5V:
 466         case VDIV_500MV:
 467         case VDIV_50MV:
 468                 cmdstring[2] |= 0x08;
 469                 break;
 470         }
 471
 472         if (send_begin(sdi) != SR_OK)
 473                 return SR_ERR;
 474
 475         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 476                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 477                 sr_err("Failed to set voltage: %s.", libusb_error_name(ret));
 478                 return SR_ERR;
 479         }
 480         sr_dbg("Sent CMD_SET_VOLTAGE.");
 481
 482         return SR_OK;
 483 }
 484
 485 static int dso_set_relays(const struct sr_dev_inst *sdi)
 486 {
 487         struct dev_context *devc;
 488         struct sr_usb_dev_inst *usb;
 489         GString *gs;
 490         int ret, i;
 491         uint8_t relays[17] = { 0x00, 0x04, 0x08, 0x02, 0x20, 0x40, 0x10, 0x01,
 492                         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 493
 494         sr_dbg("Preparing CTRL_SETRELAYS.");
 495
 496         devc = sdi->priv;
 497         usb = sdi->conn;
 498
 499         if (devc->voltage[0] < VDIV_1V)
 500                 relays[1] = ~relays[1];
 501
 502         if (devc->voltage[0] < VDIV_100MV)
 503                 relays[2] = ~relays[2];
 504
 505         sr_dbg("CH1 coupling: %d.", devc->coupling[0]);
 506         if (devc->coupling[0] != COUPLING_AC)
 507                 relays[3] = ~relays[3];
 508
 509         if (devc->voltage[1] < VDIV_1V)
 510                 relays[4] = ~relays[4];
 511
 512         if (devc->voltage[1] < VDIV_100MV)
 513                 relays[5] = ~relays[5];
 514
 515         sr_dbg("CH2 coupling: %d.", devc->coupling[1]);
 516         if (devc->coupling[1] != COUPLING_AC)
 517                 relays[6] = ~relays[6];
 518
 519         if (!strcmp(devc->triggersource, "EXT"))
 520                 relays[7] = ~relays[7];
 521
 522         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 523                 gs = g_string_sized_new(128);
 524                 g_string_printf(gs, "Relays:");
 525                 for (i = 0; i < 17; i++)
 526                         g_string_append_printf(gs, " %.2x", relays[i]);
 527                 sr_dbg("%s", gs->str);
 528                 g_string_free(gs, TRUE);
 529         }
 530
 531         if ((ret = libusb_control_transfer(usb->devhdl,
 532                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETRELAYS,
 533                         0, 0, relays, 17, 100)) != sizeof(relays)) {
 534                 sr_err("Failed to set relays: %s.", libusb_error_name(ret));
 535                 return SR_ERR;
 536         }
 537         sr_dbg("Sent CTRL_SETRELAYS.");
 538
 539         return SR_OK;
 540 }
 541
 542 static int dso_set_voffsets(const struct sr_dev_inst *sdi)
 543 {
 544         struct dev_context *devc;
 545         struct sr_usb_dev_inst *usb;
 546         int offset, ret;
 547         uint16_t *ch_levels;
 548         uint8_t offsets[17];
 549
 550         sr_dbg("Preparing CTRL_SETOFFSET.");
 551
 552         devc = sdi->priv;
 553         usb = sdi->conn;
 554
 555         memset(offsets, 0, sizeof(offsets));
 556         /* Channel 1 */
 557         ch_levels = devc->channel_levels[0][devc->voltage[0]];
 558         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch1 + ch_levels[0];
 559         offsets[0] = (offset >> 8) | 0x20;
 560         offsets[1] = offset & 0xff;
 561         sr_dbg("CH1 offset: %3.2f (%.2x%.2x).", devc->voffset_ch1,
 562                offsets[0], offsets[1]);
 563
 564         /* Channel 2 */
 565         ch_levels = devc->channel_levels[1][devc->voltage[1]];
 566         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch2 + ch_levels[0];
 567         offsets[2] = (offset >> 8) | 0x20;
 568         offsets[3] = offset & 0xff;
 569         sr_dbg("CH2 offset: %3.2f (%.2x%.2x).", devc->voffset_ch2,
 570                offsets[2], offsets[3]);
 571
 572         /* Trigger */
 573         offset = MAX_VERT_TRIGGER * devc->voffset_trigger;
 574         offsets[4] = (offset >> 8) | 0x20;
 575         offsets[5] = offset & 0xff;
 576         sr_dbg("Trigger offset: %3.2f (%.2x%.2x).", devc->voffset_trigger,
 577                         offsets[4], offsets[5]);
 578
 579         if ((ret = libusb_control_transfer(usb->devhdl,
 580                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETOFFSET,
 581                         0, 0, offsets, sizeof(offsets), 100)) != sizeof(offsets)) {
 582                 sr_err("Failed to set offsets: %s.", libusb_error_name(ret));
 583                 return SR_ERR;
 584         }
 585         sr_dbg("Sent CTRL_SETOFFSET.");
 586
 587         return SR_OK;
 588 }
 589
 590 SR_PRIV int dso_enable_trigger(const struct sr_dev_inst *sdi)
 591 {
 592         struct sr_usb_dev_inst *usb;
 593         int ret, tmp;
 594         uint8_t cmdstring[2];
 595
 596         sr_dbg("Sending CMD_ENABLE_TRIGGER.");
 597
 598         usb = sdi->conn;
 599
 600         memset(cmdstring, 0, sizeof(cmdstring));
 601         cmdstring[0] = CMD_ENABLE_TRIGGER;
 602         cmdstring[1] = 0x00;
 603
 604         if (send_begin(sdi) != SR_OK)
 605                 return SR_ERR;
 606
 607         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 608                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 609                 sr_err("Failed to enable trigger: %s.", libusb_error_name(ret));
 610                 return SR_ERR;
 611         }
 612
 613         return SR_OK;
 614 }
 615
 616 SR_PRIV int dso_force_trigger(const struct sr_dev_inst *sdi)
 617 {
 618         struct sr_usb_dev_inst *usb;
 619         int ret, tmp;
 620         uint8_t cmdstring[2];
 621
 622         sr_dbg("Sending CMD_FORCE_TRIGGER.");
 623
 624         usb = sdi->conn;
 625
 626         memset(cmdstring, 0, sizeof(cmdstring));
 627         cmdstring[0] = CMD_FORCE_TRIGGER;
 628         cmdstring[1] = 0x00;
 629
 630         if (send_begin(sdi) != SR_OK)
 631                 return SR_ERR;
 632
 633         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 634                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 635                 sr_err("Failed to force trigger: %s.", libusb_error_name(ret));
 636                 return SR_ERR;
 637         }
 638
 639         return SR_OK;
 640 }
 641
 642 SR_PRIV int dso_init(const struct sr_dev_inst *sdi)
 643 {
 644
 645         sr_dbg("Initializing DSO.");
 646
 647         if (get_channel_offsets(sdi) != SR_OK)
 648                 return SR_ERR;
 649
 650         if (dso_set_trigger_samplerate(sdi) != SR_OK)
 651                 return SR_ERR;
 652
 653         if (dso_set_filters(sdi) != SR_OK)
 654                 return SR_ERR;
 655
 656         if (dso_set_voltage(sdi) != SR_OK)
 657                 return SR_ERR;
 658
 659         if (dso_set_relays(sdi) != SR_OK)
 660                 return SR_ERR;
 661
 662         if (dso_set_voffsets(sdi) != SR_OK)
 663                 return SR_ERR;
 664
 665         if (dso_enable_trigger(sdi) != SR_OK)
 666                 return SR_ERR;
 667
 668         return SR_OK;
 669 }
 670
 671 SR_PRIV int dso_get_capturestate(const struct sr_dev_inst *sdi,
 672                 uint8_t *capturestate, uint32_t *trigger_offset)
 673 {
 674         struct sr_usb_dev_inst *usb;
 675         int ret, tmp, i;
 676         unsigned int bitvalue, toff;
 677         uint8_t cmdstring[2], inbuf[512];
 678
 679         sr_dbg("Sending CMD_GET_CAPTURESTATE.");
 680
 681         usb = sdi->conn;
 682
 683         cmdstring[0] = CMD_GET_CAPTURESTATE;
 684         cmdstring[1] = 0;
 685
 686         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 687                 sr_dbg("Failed to send get_capturestate command: %s.",
 688                        libusb_error_name(ret));
 689                 return SR_ERR;
 690         }
 691
 692         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_IN,
 693                         inbuf, 512, &tmp, 100)) != 0) {
 694                 sr_dbg("Failed to get capturestate: %s.",
 695                        libusb_error_name(ret));
 696                 return SR_ERR;
 697         }
 698         *capturestate = inbuf[0];
 699         toff = (inbuf[1] << 16) | (inbuf[3] << 8) | inbuf[2];
 700
 701         /*
 702          * This conversion comes from the openhantek project.
 703          * Each set bit in the 24-bit value inverts all bits with a lower
 704          * value. No idea why the device reports the trigger point this way.
 705          */
 706         bitvalue = 1;
 707         for (i = 0; i < 24; i++) {
 708                 /* Each set bit inverts all bits with a lower value. */
 709                 if (toff & bitvalue)
 710                         toff ^= bitvalue - 1;
 711                 bitvalue <<= 1;
 712         }
 713         *trigger_offset = toff;
 714
 715         return SR_OK;
 716 }
 717
 718 SR_PRIV int dso_capture_start(const struct sr_dev_inst *sdi)
 719 {
 720         int ret;
 721         uint8_t cmdstring[2];
 722
 723         sr_dbg("Sending CMD_CAPTURE_START.");
 724
 725         cmdstring[0] = CMD_CAPTURE_START;
 726         cmdstring[1] = 0;
 727
 728         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 729                 sr_err("Failed to send capture_start command: %s.",
 730                        libusb_error_name(ret));
 731                 return SR_ERR;
 732         }
 733
 734         return SR_OK;
 735 }
 736
 737 SR_PRIV int dso_get_channeldata(const struct sr_dev_inst *sdi,
 738                 libusb_transfer_cb_fn cb)
 739 {
 740         struct dev_context *devc;
 741         struct sr_usb_dev_inst *usb;
 742         struct libusb_transfer *transfer;
 743         int num_transfers, ret, i;
 744         uint8_t cmdstring[2];
 745         unsigned char *buf;
 746
 747         sr_dbg("Sending CMD_GET_CHANNELDATA.");
 748
 749         devc = sdi->priv;
 750         usb = sdi->conn;
 751
 752         cmdstring[0] = CMD_GET_CHANNELDATA;
 753         cmdstring[1] = 0;
 754
 755         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 756                 sr_err("Failed to get channel data: %s.",
 757                        libusb_error_name(ret));
 758                 return SR_ERR;
 759         }
 760
 761         /* TODO: DSO-2xxx only. */
 762         num_transfers = devc->framesize *
 763                         sizeof(unsigned short) / devc->epin_maxpacketsize;
 764         sr_dbg("Queueing up %d transfers.", num_transfers);
 765         for (i = 0; i < num_transfers; i++) {
 766                 if (!(buf = g_try_malloc(devc->epin_maxpacketsize))) {
 767                         sr_err("Failed to malloc USB endpoint buffer.");
 768                         return SR_ERR_MALLOC;
 769                 }
 770                 transfer = libusb_alloc_transfer(0);
 771                 libusb_fill_bulk_transfer(transfer, usb->devhdl, DSO_EP_IN, buf,
 772                                 devc->epin_maxpacketsize, cb, (void *)sdi, 40);
 773                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 774                         sr_err("Failed to submit transfer: %s.",
 775                                libusb_error_name(ret));
 776                         /* TODO: Free them all. */
 777                         libusb_free_transfer(transfer);
 778                         g_free(buf);
 779                         return SR_ERR;
 780                 }
 781         }
 782
 783         return SR_OK;
 784 }