hardware/hantek-dso/dso.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
   5  * With protocol information from the hantekdso project,
   6  * Copyright (C) 2008 Oleg Khudyakov <prcoder@gmail.com>
   7  *
   8  * This program is free software: you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation, either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "libsigrok.h"
  23 #include "libsigrok-internal.h"
  24 #include "dso.h"
  25 #include <string.h>
  26 #include <glib.h>
  27 #include <libusb.h>
  28
  29 extern struct sr_dev_driver hantek_dso_driver_info;
  30
  31
  32 static int send_begin(struct dev_context *devc)
  33 {
  34         int ret;
  35         unsigned char buffer[] = {0x0f, 0x03, 0x03, 0x03, 0x68, 0xac, 0xfe,
  36         0x00, 0x01, 0x00};
  37
  38         sr_dbg("hantek-dso: sending CTRL_BEGINCOMMAND");
  39
  40         if ((ret = libusb_control_transfer(devc->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: %d", ret);
  44                 return SR_ERR;
  45         }
  46
  47         return SR_OK;
  48 }
  49
  50 static int send_bulkcmd(struct dev_context *devc, uint8_t *cmdstring, int cmdlen)
  51 {
  52         int ret, tmp;
  53
  54         if (send_begin(devc) != SR_OK)
  55                 return SR_ERR;
  56
  57         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
  58                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
  59                         cmdstring, cmdlen, &tmp, 200)) != 0)
  60                 return SR_ERR;
  61
  62         return SR_OK;
  63 }
  64
  65 SR_PRIV int dso_getmps(libusb_device *dev)
  66 {
  67         struct libusb_device_descriptor des;
  68         struct libusb_config_descriptor *conf_dsc;
  69         const struct libusb_interface_descriptor *intf_dsc;
  70         int mps;
  71
  72         if (libusb_get_device_descriptor(dev, &des) != 0)
  73                 return 0;
  74
  75         if (des.bNumConfigurations != 1)
  76                 return 0;
  77
  78         if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
  79                 return 0;
  80
  81         mps = 0;
  82         intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
  83         if (intf_dsc->bNumEndpoints != 2)
  84                 goto err;
  85
  86         if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
  87             (2 | LIBUSB_ENDPOINT_OUT))
  88                 /* The first endpoint should be 2 (outbound). */
  89                 goto err;
  90
  91         if ((intf_dsc->endpoint[1].bEndpointAddress & 0x8f) !=
  92             (6 | LIBUSB_ENDPOINT_IN))
  93                 /* The second endpoint should be 6 (inbound). */
  94                 goto err;
  95
  96         mps = intf_dsc->endpoint[1].wMaxPacketSize;
  97
  98 err:
  99         if (conf_dsc)
 100                 libusb_free_config_descriptor(conf_dsc);
 101
 102         return mps;
 103 }
 104
 105 SR_PRIV int dso_open(struct sr_dev_inst *sdi)
 106 {
 107         libusb_device **devlist;
 108         struct libusb_device_descriptor des;
 109         struct dev_context *devc;
 110         int err, skip, i;
 111
 112         devc = sdi->priv;
 113
 114         if (sdi->status == SR_ST_ACTIVE)
 115                 /* already in use */
 116                 return SR_ERR;
 117
 118         skip = 0;
 119         libusb_get_device_list(NULL, &devlist);
 120         for (i = 0; devlist[i]; i++) {
 121                 if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
 122                         sr_err("hantek-dso: failed to get device descriptor: %d", err);
 123                         continue;
 124                 }
 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                         if (skip != sdi->index) {
 132                                 /* Skip devices of this type that aren't the one we want. */
 133                                 skip += 1;
 134                                 continue;
 135                         }
 136                 } else if (sdi->status == SR_ST_INACTIVE) {
 137                         /*
 138                          * This device is fully enumerated, so we need to find
 139                          * this device by vendor, product, bus and address.
 140                          */
 141                         if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
 142                                 || libusb_get_device_address(devlist[i]) != devc->usb->address)
 143                                 /* this is not the one */
 144                                 continue;
 145                 }
 146
 147                 if (!(err = libusb_open(devlist[i], &devc->usb->devhdl))) {
 148                         if (devc->usb->address == 0xff)
 149                                 /*
 150                                  * first time we touch this device after firmware upload,
 151                                  * so we don't know the address yet.
 152                                  */
 153                                 devc->usb->address = libusb_get_device_address(devlist[i]);
 154
 155                         if(!(devc->epin_maxpacketsize = dso_getmps(devlist[i])))
 156                                 sr_err("hantek-dso: wrong endpoint profile");
 157                         else {
 158                                 sdi->status = SR_ST_ACTIVE;
 159                                 sr_info("hantek-dso: opened device %d on %d.%d interface %d",
 160                                         sdi->index, devc->usb->bus,
 161                                         devc->usb->address, USB_INTERFACE);
 162                         }
 163                 } else {
 164                         sr_err("hantek-dso: failed to open device: %d", err);
 165                 }
 166
 167                 /* if we made it here, we handled the device one way or another */
 168                 break;
 169         }
 170         libusb_free_device_list(devlist, 1);
 171
 172         if (sdi->status != SR_ST_ACTIVE)
 173                 return SR_ERR;
 174
 175         return SR_OK;
 176 }
 177
 178 SR_PRIV void dso_close(struct sr_dev_inst *sdi)
 179 {
 180         struct dev_context *devc;
 181
 182         devc = sdi->priv;
 183
 184         if (devc->usb->devhdl == NULL)
 185                 return;
 186
 187         sr_info("hantek-dso: closing device %d on %d.%d interface %d", sdi->index,
 188                 devc->usb->bus, devc->usb->address, USB_INTERFACE);
 189         libusb_release_interface(devc->usb->devhdl, USB_INTERFACE);
 190         libusb_close(devc->usb->devhdl);
 191         devc->usb->devhdl = NULL;
 192         sdi->status = SR_ST_INACTIVE;
 193
 194 }
 195
 196 static int get_channel_offsets(struct dev_context *devc)
 197 {
 198         GString *gs;
 199         int chan, v, ret;
 200
 201         sr_dbg("hantek-dso: getting channel offsets");
 202
 203         ret = libusb_control_transfer(devc->usb->devhdl,
 204                         LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_VENDOR,
 205                         CTRL_READ_EEPROM, EEPROM_CHANNEL_OFFSETS, 0,
 206                         (unsigned char *)&devc->channel_levels,
 207                         sizeof(devc->channel_levels), 200);
 208         if (ret != sizeof(devc->channel_levels)) {
 209                 sr_err("failed to get channel offsets: %d", 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 < 2; chan++) {
 219                 for (v = 0; v < 9; v++) {
 220                         devc->channel_levels[chan][v][0] = g_ntohs(devc->channel_levels[chan][v][0]);
 221                         devc->channel_levels[chan][v][1] = g_ntohs(devc->channel_levels[chan][v][1]);
 222                 }
 223         }
 224
 225         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 226                 gs = g_string_sized_new(128);
 227                 for (chan = 0; chan < 2; chan++) {
 228                         g_string_printf(gs, "hantek-dso: CH%d:", chan + 1);
 229                         for (v = 0; v < 9; v++) {
 230                                 g_string_append_printf(gs, " %.4x-%.4x",
 231                                                 devc->channel_levels[chan][v][0],
 232                                                 devc->channel_levels[chan][v][1]);
 233                         }
 234                         sr_dbg(gs->str);
 235                 }
 236                 g_string_free(gs, TRUE);
 237         }
 238
 239         return SR_OK;
 240 }
 241
 242 SR_PRIV int dso_set_trigger_samplerate(struct dev_context *devc)
 243 {
 244         int ret, tmp;
 245         uint8_t cmdstring[12];
 246         uint16_t timebase_small[] = { 0xffff, 0xfffc, 0xfff7, 0xffe8, 0xffce,
 247                         0xff9c, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79, 0xd8f1 };
 248         uint16_t timebase_large[] = { 0xffff, 0x0000, 0xfffc, 0xfff7, 0xffe8,
 249                         0xffce, 0xff9d, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79 };
 250
 251         sr_dbg("hantek-dso: preparing CMD_SET_TRIGGER_SAMPLERATE");
 252
 253         memset(cmdstring, 0, sizeof(cmdstring));
 254         /* Command */
 255         cmdstring[0] = CMD_SET_TRIGGER_SAMPLERATE;
 256
 257         /* Trigger source */
 258         sr_dbg("hantek-dso: trigger source %s", devc->triggersource);
 259         if (!strcmp("CH2", devc->triggersource))
 260                 tmp = 0;
 261         else if (!strcmp("CH1", devc->triggersource))
 262                 tmp = 1;
 263         else if (!strcmp("EXT", devc->triggersource))
 264                 tmp = 2;
 265         else {
 266                 sr_err("hantek-dso: invalid trigger source %s", devc->triggersource);
 267                 return SR_ERR_ARG;
 268         }
 269         cmdstring[2] = tmp;
 270
 271         /* Frame size */
 272         sr_dbg("hantek-dso: frame size %d", devc->framesize);
 273         cmdstring[2] |= (devc->framesize == FRAMESIZE_SMALL ? 0x01 : 0x02) << 2;
 274
 275         /* Timebase fast */
 276         sr_dbg("hantek-dso: time base index %d", devc->timebase);
 277         switch (devc->framesize) {
 278         case FRAMESIZE_SMALL:
 279                 if (devc->timebase < TIME_20us)
 280                         tmp = 0;
 281                 else if (devc->timebase == TIME_20us)
 282                         tmp = 1;
 283                 else if (devc->timebase == TIME_40us)
 284                         tmp = 2;
 285                 else if (devc->timebase == TIME_100us)
 286                         tmp = 3;
 287                 else if (devc->timebase >= TIME_200us)
 288                         tmp = 4;
 289                 break;
 290         case FRAMESIZE_LARGE:
 291                 if (devc->timebase < TIME_40us) {
 292                         sr_err("hantek-dso: timebase < 40us only supported with 10K buffer");
 293                         return SR_ERR_ARG;
 294                 }
 295                 else if (devc->timebase == TIME_40us)
 296                         tmp = 0;
 297                 else if (devc->timebase == TIME_100us)
 298                         tmp = 2;
 299                 else if (devc->timebase == TIME_200us)
 300                         tmp = 3;
 301                 else if (devc->timebase >= TIME_400us)
 302                         tmp = 4;
 303                 break;
 304         }
 305         cmdstring[2] |= (tmp & 0x07) << 5;
 306
 307         /* Enabled channels: 00=CH1 01=CH2 10=both */
 308         sr_dbg("hantek-dso: channels CH1=%d CH2=%d", devc->ch1_enabled, devc->ch2_enabled);
 309         tmp = (((devc->ch2_enabled ? 1 : 0) << 1) + (devc->ch1_enabled ? 1 : 0)) - 1;
 310         cmdstring[3] = tmp;
 311
 312         /* Fast rates channel */
 313         /* TODO: is this right? */
 314         tmp = devc->timebase < TIME_10us ? 1 : 0;
 315         cmdstring[3] |= tmp << 2;
 316
 317         /* Trigger slope: 0=positive 1=negative */
 318         /* TODO: does this work? */
 319         sr_dbg("hantek-dso: trigger slope %d", devc->triggerslope);
 320         cmdstring[3] |= (devc->triggerslope == SLOPE_NEGATIVE ? 1 : 0) << 3;
 321
 322         /* Timebase slow */
 323         if (devc->timebase < TIME_100us)
 324                 tmp = 0;
 325         else if (devc->timebase > TIME_400ms)
 326                 tmp = 0xffed;
 327         else {
 328                 if (devc->framesize == FRAMESIZE_SMALL)
 329                         tmp = timebase_small[devc->timebase - 3];
 330                 else
 331                         tmp = timebase_large[devc->timebase - 3];
 332         }
 333         cmdstring[4] = tmp & 0xff;
 334         cmdstring[5] = (tmp >> 8) & 0xff;
 335
 336         /* Horizontal trigger position */
 337         sr_dbg("hantek-dso: trigger position %3.2f", devc->triggerposition);
 338         tmp = 0x77fff + 0x8000 * devc->triggerposition;
 339         cmdstring[6] = tmp & 0xff;
 340         cmdstring[7] = (tmp >> 8) & 0xff;
 341         cmdstring[10] = (tmp >> 16) & 0xff;
 342
 343         if (send_begin(devc) != SR_OK)
 344                 return SR_ERR;
 345
 346         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 347                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 348                         cmdstring, sizeof(cmdstring),
 349                         &tmp, 100)) != 0) {
 350                 sr_err("Failed to set trigger/samplerate: %d", ret);
 351                 return SR_ERR;
 352         }
 353         sr_dbg("hantek-dso: sent CMD_SET_TRIGGER_SAMPLERATE");
 354
 355         return SR_OK;
 356 }
 357
 358 SR_PRIV int dso_set_filters(struct dev_context *devc)
 359 {
 360         int ret, tmp;
 361         uint8_t cmdstring[8];
 362
 363         sr_dbg("hantek-dso: preparing CMD_SET_FILTERS");
 364
 365         memset(cmdstring, 0, sizeof(cmdstring));
 366         cmdstring[0] = CMD_SET_FILTERS;
 367         cmdstring[1] = 0x0f;
 368         if (devc->filter_ch1) {
 369                 sr_dbg("hantek-dso: turning on CH1 filter");
 370                 cmdstring[2] |= 0x80;
 371         }
 372         if (devc->filter_ch2) {
 373                 sr_dbg("hantek-dso: turning on CH2 filter");
 374                 cmdstring[2] |= 0x40;
 375         }
 376         if (devc->filter_trigger) {
 377                 /* TODO: supported on the DSO-2090? */
 378                 sr_dbg("hantek-dso: turning on trigger filter");
 379                 cmdstring[2] |= 0x20;
 380         }
 381
 382         if (send_begin(devc) != SR_OK)
 383                 return SR_ERR;
 384
 385         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 386                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 387                         cmdstring, sizeof(cmdstring),
 388                         &tmp, 100)) != 0) {
 389                 sr_err("Failed to set filters: %d", ret);
 390                 return SR_ERR;
 391         }
 392         sr_dbg("hantek-dso: sent CMD_SET_FILTERS");
 393
 394         return SR_OK;
 395 }
 396
 397 SR_PRIV int dso_set_voltage(struct dev_context *devc)
 398 {
 399         int ret, tmp;
 400         uint8_t cmdstring[8];
 401
 402         sr_dbg("hantek-dso: preparing CMD_SET_VOLTAGE");
 403
 404         memset(cmdstring, 0, sizeof(cmdstring));
 405         cmdstring[0] = CMD_SET_VOLTAGE;
 406         cmdstring[1] = 0x0f;
 407         cmdstring[2] = 0x30;
 408
 409         /* CH1 volts/div is encoded in bits 0-1 */
 410         sr_dbg("hantek-dso: CH1 vdiv index %d", devc->voltage_ch1);
 411         switch (devc->voltage_ch1) {
 412         case VDIV_1V:
 413         case VDIV_100MV:
 414         case VDIV_10MV:
 415                 cmdstring[2] |= 0x00;
 416                 break;
 417         case VDIV_2V:
 418         case VDIV_200MV:
 419         case VDIV_20MV:
 420                 cmdstring[2] |= 0x01;
 421                 break;
 422         case VDIV_5V:
 423         case VDIV_500MV:
 424         case VDIV_50MV:
 425                 cmdstring[2] |= 0x02;
 426                 break;
 427         }
 428
 429         /* CH2 volts/div is encoded in bits 2-3 */
 430         sr_dbg("hantek-dso: CH2 vdiv index %d", devc->voltage_ch2);
 431         switch (devc->voltage_ch2) {
 432         case VDIV_1V:
 433         case VDIV_100MV:
 434         case VDIV_10MV:
 435                 cmdstring[2] |= 0x00;
 436                 break;
 437         case VDIV_2V:
 438         case VDIV_200MV:
 439         case VDIV_20MV:
 440                 cmdstring[2] |= 0x04;
 441                 break;
 442         case VDIV_5V:
 443         case VDIV_500MV:
 444         case VDIV_50MV:
 445                 cmdstring[2] |= 0x08;
 446                 break;
 447         }
 448
 449         if (send_begin(devc) != SR_OK)
 450                 return SR_ERR;
 451
 452         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 453                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 454                         cmdstring, sizeof(cmdstring),
 455                         &tmp, 100)) != 0) {
 456                 sr_err("Failed to set voltage: %d", ret);
 457                 return SR_ERR;
 458         }
 459         sr_dbg("hantek-dso: sent CMD_SET_VOLTAGE");
 460
 461         return SR_OK;
 462 }
 463
 464 SR_PRIV int dso_set_relays(struct dev_context *devc)
 465 {
 466         GString *gs;
 467         int ret, i;
 468         uint8_t relays[17] = { 0x00, 0x04, 0x08, 0x02, 0x20, 0x40, 0x10, 0x01,
 469                         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 470
 471         sr_dbg("hantek-dso: preparing CTRL_SETRELAYS");
 472
 473         if (devc->voltage_ch1 < VDIV_1V)
 474                 relays[1] = ~relays[1];
 475
 476         if (devc->voltage_ch1 < VDIV_100MV)
 477                 relays[2] = ~relays[2];
 478
 479         sr_dbg("hantek-dso: CH1 coupling %d", devc->coupling_ch1);
 480         if (devc->coupling_ch1 != COUPLING_AC)
 481                 relays[3] = ~relays[3];
 482
 483         if (devc->voltage_ch2 < VDIV_1V)
 484                 relays[4] = ~relays[4];
 485
 486         if (devc->voltage_ch2 < VDIV_100MV)
 487                 relays[5] = ~relays[5];
 488
 489         sr_dbg("hantek-dso: CH2 coupling %d", devc->coupling_ch1);
 490         if (devc->coupling_ch2 != COUPLING_AC)
 491                 relays[6] = ~relays[6];
 492
 493         if (!strcmp(devc->triggersource, "EXT"))
 494                 relays[7] = ~relays[7];
 495
 496         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 497                 gs = g_string_sized_new(128);
 498                 g_string_printf(gs, "hantek-dso: relays:");
 499                 for (i = 0; i < 17; i++)
 500                         g_string_append_printf(gs, " %.2x", relays[i]);
 501                 sr_dbg(gs->str);
 502                 g_string_free(gs, TRUE);
 503         }
 504
 505         if ((ret = libusb_control_transfer(devc->usb->devhdl,
 506                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETRELAYS,
 507                         0, 0, relays, 17, 100)) != sizeof(relays)) {
 508                 sr_err("failed to set relays: %d", ret);
 509                 return SR_ERR;
 510         }
 511         sr_dbg("hantek-dso: sent CTRL_SETRELAYS");
 512
 513         return SR_OK;
 514 }
 515
 516 SR_PRIV int dso_set_voffsets(struct dev_context *devc)
 517 {
 518         int offset, ret;
 519         uint16_t *ch_levels;
 520         uint8_t offsets[17];
 521
 522         sr_dbg("hantek-dso: preparing CTRL_SETOFFSET");
 523
 524         memset(offsets, 0, sizeof(offsets));
 525         /* Channel 1 */
 526         ch_levels = devc->channel_levels[0][devc->voltage_ch1];
 527         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch1 + ch_levels[0];
 528         offsets[0] = (offset >> 8) | 0x20;
 529         offsets[1] = offset & 0xff;
 530         sr_dbg("hantek-dso: CH1 offset %3.2f (%.2x%.2x)", devc->voffset_ch1,
 531                         offsets[0], offsets[1]);
 532
 533         /* Channel 2 */
 534         ch_levels = devc->channel_levels[1][devc->voltage_ch2];
 535         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch2 + ch_levels[0];
 536         offsets[2] = (offset >> 8) | 0x20;
 537         offsets[3] = offset & 0xff;
 538         sr_dbg("hantek-dso: CH2 offset %3.2f (%.2x%.2x)", devc->voffset_ch2,
 539                         offsets[2], offsets[3]);
 540
 541         /* Trigger */
 542         offset = MAX_VERT_TRIGGER * devc->voffset_trigger;
 543         offsets[4] = (offset >> 8) | 0x20;
 544         offsets[5] = offset & 0xff;
 545         sr_dbg("hantek-dso: trigger offset %3.2f (%.2x%.2x)", devc->voffset_trigger,
 546                         offsets[4], offsets[5]);
 547
 548         if ((ret = libusb_control_transfer(devc->usb->devhdl,
 549                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETOFFSET,
 550                         0, 0, offsets, sizeof(offsets), 100)) != sizeof(offsets)) {
 551                 sr_err("failed to set offsets: %d", ret);
 552                 return SR_ERR;
 553         }
 554         sr_dbg("hantek-dso: sent CTRL_SETOFFSET");
 555
 556         return SR_OK;
 557 }
 558
 559 SR_PRIV int dso_enable_trigger(struct dev_context *devc)
 560 {
 561         int ret, tmp;
 562         uint8_t cmdstring[2];
 563
 564         sr_dbg("hantek-dso: sending CMD_ENABLE_TRIGGER");
 565
 566         memset(cmdstring, 0, sizeof(cmdstring));
 567         cmdstring[0] = CMD_ENABLE_TRIGGER;
 568         cmdstring[1] = 0x00;
 569
 570         if (send_begin(devc) != SR_OK)
 571                 return SR_ERR;
 572
 573         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 574                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 575                         cmdstring, sizeof(cmdstring),
 576                         &tmp, 100)) != 0) {
 577                 sr_err("Failed to enable trigger: %d", ret);
 578                 return SR_ERR;
 579         }
 580
 581         return SR_OK;
 582 }
 583
 584 SR_PRIV int dso_force_trigger(struct dev_context *devc)
 585 {
 586         int ret, tmp;
 587         uint8_t cmdstring[2];
 588
 589         sr_dbg("hantek-dso: sending CMD_FORCE_TRIGGER");
 590
 591         memset(cmdstring, 0, sizeof(cmdstring));
 592         cmdstring[0] = CMD_FORCE_TRIGGER;
 593         cmdstring[1] = 0x00;
 594
 595         if (send_begin(devc) != SR_OK)
 596                 return SR_ERR;
 597
 598         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 599                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 600                         cmdstring, sizeof(cmdstring),
 601                         &tmp, 100)) != 0) {
 602                 sr_err("Failed to force trigger: %d", ret);
 603                 return SR_ERR;
 604         }
 605
 606         return SR_OK;
 607 }
 608
 609 SR_PRIV int dso_init(struct dev_context *devc)
 610 {
 611
 612         sr_dbg("hantek-dso: initializing dso");
 613
 614         if (get_channel_offsets(devc) != SR_OK)
 615                 return SR_ERR;
 616
 617         if (dso_set_trigger_samplerate(devc) != SR_OK)
 618                 return SR_ERR;
 619
 620         if (dso_set_filters(devc) != SR_OK)
 621                 return SR_ERR;
 622
 623         if (dso_set_voltage(devc) != SR_OK)
 624                 return SR_ERR;
 625
 626         if (dso_set_relays(devc) != SR_OK)
 627                 return SR_ERR;
 628
 629         if (dso_set_voffsets(devc) != SR_OK)
 630                 return SR_ERR;
 631
 632         if (dso_enable_trigger(devc) != SR_OK)
 633                 return SR_ERR;
 634
 635         return SR_OK;
 636 }
 637
 638 SR_PRIV int dso_get_capturestate(struct dev_context *devc, uint8_t *capturestate,
 639                 uint32_t *trigger_offset)
 640 {
 641         int ret, tmp, i;
 642         unsigned int bitvalue, toff;
 643         uint8_t cmdstring[2], inbuf[512];
 644
 645         sr_dbg("hantek-dso: sending CMD_GET_CAPTURESTATE");
 646
 647         cmdstring[0] = CMD_GET_CAPTURESTATE;
 648         cmdstring[1] = 0;
 649
 650         if ((ret = send_bulkcmd(devc, cmdstring, sizeof(cmdstring))) != SR_OK) {
 651                 sr_dbg("Failed to send get_capturestate command: %d", ret);
 652                 return SR_ERR;
 653         }
 654
 655         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 656                         DSO_EP_IN | LIBUSB_ENDPOINT_IN,
 657                         inbuf, 512, &tmp, 100)) != 0) {
 658                 sr_dbg("Failed to get capturestate: %d", ret);
 659                 return SR_ERR;
 660         }
 661         *capturestate = inbuf[0];
 662         toff = (inbuf[1] << 16) | (inbuf[3] << 8) | inbuf[2];
 663
 664         /* This conversion comes from the openhantek project.
 665          * Each set bit in the 24-bit value inverts all bits with a lower
 666          * value. No idea why the device reports the trigger point this way.
 667          */
 668         bitvalue = 1;
 669         for (i = 0; i < 24; i++) {
 670                 /* Each set bit inverts all bits with a lower value. */
 671                 if(toff & bitvalue)
 672                         toff ^= bitvalue - 1;
 673                 bitvalue <<= 1;
 674         }
 675         *trigger_offset = toff;
 676
 677         return SR_OK;
 678 }
 679
 680 SR_PRIV int dso_capture_start(struct dev_context *devc)
 681 {
 682         int ret;
 683         uint8_t cmdstring[2];
 684
 685         sr_dbg("hantek-dso: sending CMD_CAPTURE_START");
 686
 687         cmdstring[0] = CMD_CAPTURE_START;
 688         cmdstring[1] = 0;
 689
 690         if ((ret = send_bulkcmd(devc, cmdstring, sizeof(cmdstring))) != SR_OK) {
 691                 sr_err("Failed to send capture_start command: %d", ret);
 692                 return SR_ERR;
 693         }
 694
 695         return SR_OK;
 696 }
 697
 698 SR_PRIV int dso_get_channeldata(struct dev_context *devc, libusb_transfer_cb_fn cb)
 699 {
 700         struct libusb_transfer *transfer;
 701         int num_transfers, ret, i;
 702         uint8_t cmdstring[2];
 703         unsigned char *buf;
 704
 705         sr_dbg("hantek-dso: sending CMD_GET_CHANNELDATA");
 706
 707         cmdstring[0] = CMD_GET_CHANNELDATA;
 708         cmdstring[1] = 0;
 709
 710         if ((ret = send_bulkcmd(devc, cmdstring, sizeof(cmdstring))) != SR_OK) {
 711                 sr_err("Failed to get channel data: %d", ret);
 712                 return SR_ERR;
 713         }
 714
 715         /* TODO: dso-2xxx only */
 716         num_transfers = devc->framesize * sizeof(unsigned short) / devc->epin_maxpacketsize;
 717         sr_dbg("hantek-dso: queueing up %d transfers", num_transfers);
 718         for (i = 0; i < num_transfers; i++) {
 719                 if (!(buf = g_try_malloc(devc->epin_maxpacketsize))) {
 720                         sr_err("hantek-dso: %s: buf malloc failed", __func__);
 721                         return SR_ERR_MALLOC;
 722                 }
 723                 transfer = libusb_alloc_transfer(0);
 724                 libusb_fill_bulk_transfer(transfer, devc->usb->devhdl,
 725                                 DSO_EP_IN | LIBUSB_ENDPOINT_IN, buf,
 726                                 devc->epin_maxpacketsize, cb, devc, 40);
 727                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 728                         sr_err("failed to submit transfer: %d", ret);
 729                         /* TODO: Free them all. */
 730                         libusb_free_transfer(transfer);
 731                         g_free(buf);
 732                         return SR_ERR;
 733                 }
 734         }
 735
 736         return SR_OK;
 737 }
 738