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 "config.h"
  25 #include "dso.h"
  26 #include <string.h>
  27 #include <glib.h>
  28 #include <libusb.h>
  29
  30 extern struct sr_dev_driver hantek_dso_driver_info;
  31
  32
  33 static int send_begin(struct dev_context *devc)
  34 {
  35         int ret;
  36         unsigned char buffer[] = {0x0f, 0x03, 0x03, 0x03, 0x68, 0xac, 0xfe,
  37         0x00, 0x01, 0x00};
  38
  39         sr_dbg("hantek-dso: sending CTRL_BEGINCOMMAND");
  40
  41         if ((ret = libusb_control_transfer(devc->usb->devhdl,
  42                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_BEGINCOMMAND,
  43                         0, 0, buffer, sizeof(buffer), 200)) != sizeof(buffer)) {
  44                 sr_err("failed to send begincommand: %d", ret);
  45                 return SR_ERR;
  46         }
  47
  48         return SR_OK;
  49 }
  50
  51 static int send_bulkcmd(struct dev_context *devc, uint8_t *cmdstring, int cmdlen)
  52 {
  53         int ret, tmp;
  54
  55         if (send_begin(devc) != SR_OK)
  56                 return SR_ERR;
  57
  58         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
  59                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
  60                         cmdstring, cmdlen, &tmp, 200)) != 0)
  61                 return SR_ERR;
  62
  63         return SR_OK;
  64 }
  65
  66 SR_PRIV int dso_getmps(libusb_device *dev)
  67 {
  68         struct libusb_device_descriptor des;
  69         struct libusb_config_descriptor *conf_dsc;
  70         const struct libusb_interface_descriptor *intf_dsc;
  71         int mps;
  72
  73         if (libusb_get_device_descriptor(dev, &des) != 0)
  74                 return 0;
  75
  76         if (des.bNumConfigurations != 1)
  77                 return 0;
  78
  79         if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
  80                 return 0;
  81
  82         mps = 0;
  83         intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
  84         if (intf_dsc->bNumEndpoints != 2)
  85                 goto err;
  86
  87         if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
  88             (2 | LIBUSB_ENDPOINT_OUT))
  89                 /* The first endpoint should be 2 (outbound). */
  90                 goto err;
  91
  92         if ((intf_dsc->endpoint[1].bEndpointAddress & 0x8f) !=
  93             (6 | LIBUSB_ENDPOINT_IN))
  94                 /* The second endpoint should be 6 (inbound). */
  95                 goto err;
  96
  97         mps = intf_dsc->endpoint[1].wMaxPacketSize;
  98
  99 err:
 100         if (conf_dsc)
 101                 libusb_free_config_descriptor(conf_dsc);
 102
 103         return mps;
 104 }
 105
 106 SR_PRIV int dso_open(struct sr_dev_inst *sdi)
 107 {
 108         libusb_device **devlist;
 109         struct libusb_device_descriptor des;
 110         struct dev_context *devc;
 111         int err, skip, i;
 112
 113         devc = sdi->priv;
 114
 115         if (sdi->status == SR_ST_ACTIVE)
 116                 /* already in use */
 117                 return SR_ERR;
 118
 119         skip = 0;
 120         libusb_get_device_list(NULL, &devlist);
 121         for (i = 0; devlist[i]; i++) {
 122                 if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
 123                         sr_err("hantek-dso: failed to get device descriptor: %d", err);
 124                         continue;
 125                 }
 126
 127                 if (des.idVendor != devc->profile->fw_vid
 128                     || des.idProduct != devc->profile->fw_pid)
 129                         continue;
 130
 131                 if (sdi->status == SR_ST_INITIALIZING) {
 132                         if (skip != sdi->index) {
 133                                 /* Skip devices of this type that aren't the one we want. */
 134                                 skip += 1;
 135                                 continue;
 136                         }
 137                 } else if (sdi->status == SR_ST_INACTIVE) {
 138                         /*
 139                          * This device is fully enumerated, so we need to find
 140                          * this device by vendor, product, bus and address.
 141                          */
 142                         if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
 143                                 || libusb_get_device_address(devlist[i]) != devc->usb->address)
 144                                 /* this is not the one */
 145                                 continue;
 146                 }
 147
 148                 if (!(err = libusb_open(devlist[i], &devc->usb->devhdl))) {
 149                         if (devc->usb->address == 0xff)
 150                                 /*
 151                                  * first time we touch this device after firmware upload,
 152                                  * so we don't know the address yet.
 153                                  */
 154                                 devc->usb->address = libusb_get_device_address(devlist[i]);
 155
 156                         if(!(devc->epin_maxpacketsize = dso_getmps(devlist[i])))
 157                                 sr_err("hantek-dso: wrong endpoint profile");
 158                         else {
 159                                 sdi->status = SR_ST_ACTIVE;
 160                                 sr_info("hantek-dso: opened device %d on %d.%d interface %d",
 161                                         sdi->index, devc->usb->bus,
 162                                         devc->usb->address, USB_INTERFACE);
 163                         }
 164                 } else {
 165                         sr_err("hantek-dso: failed to open device: %d", err);
 166                 }
 167
 168                 /* if we made it here, we handled the device one way or another */
 169                 break;
 170         }
 171         libusb_free_device_list(devlist, 1);
 172
 173         if (sdi->status != SR_ST_ACTIVE)
 174                 return SR_ERR;
 175
 176         return SR_OK;
 177 }
 178
 179 SR_PRIV void dso_close(struct sr_dev_inst *sdi)
 180 {
 181         struct dev_context *devc;
 182
 183         devc = sdi->priv;
 184
 185         if (devc->usb->devhdl == NULL)
 186                 return;
 187
 188         sr_info("hantek-dso: closing device %d on %d.%d interface %d", sdi->index,
 189                 devc->usb->bus, devc->usb->address, USB_INTERFACE);
 190         libusb_release_interface(devc->usb->devhdl, USB_INTERFACE);
 191         libusb_close(devc->usb->devhdl);
 192         devc->usb->devhdl = NULL;
 193         sdi->status = SR_ST_INACTIVE;
 194
 195 }
 196
 197 static int get_channel_offsets(struct dev_context *devc)
 198 {
 199         GString *gs;
 200         int chan, v, ret;
 201
 202         sr_dbg("hantek-dso: getting channel offsets");
 203
 204         ret = libusb_control_transfer(devc->usb->devhdl,
 205                         LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_VENDOR,
 206                         CTRL_READ_EEPROM, EEPROM_CHANNEL_OFFSETS, 0,
 207                         (unsigned char *)&devc->channel_levels,
 208                         sizeof(devc->channel_levels), 200);
 209         if (ret != sizeof(devc->channel_levels)) {
 210                 sr_err("failed to get channel offsets: %d", ret);
 211                 return SR_ERR;
 212         }
 213
 214         /* Comes in as 16-bit numbers with the second byte always 0 on
 215          * the DSO-2090. Guessing this is supposed to be big-endian,
 216          * since that's how voltage offsets are submitted back to the DSO.
 217          * Convert to host order now, so we can use them natively.
 218          */
 219         for (chan = 0; chan < 2; chan++) {
 220                 for (v = 0; v < 9; v++) {
 221                         devc->channel_levels[chan][v][0] = g_ntohs(devc->channel_levels[chan][v][0]);
 222                         devc->channel_levels[chan][v][1] = g_ntohs(devc->channel_levels[chan][v][1]);
 223                 }
 224         }
 225
 226         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 227                 gs = g_string_sized_new(128);
 228                 for (chan = 0; chan < 2; chan++) {
 229                         g_string_printf(gs, "hantek-dso: CH%d:", chan + 1);
 230                         for (v = 0; v < 9; v++) {
 231                                 g_string_append_printf(gs, " %.4x-%.4x",
 232                                                 devc->channel_levels[chan][v][0],
 233                                                 devc->channel_levels[chan][v][1]);
 234                         }
 235                         sr_dbg(gs->str);
 236                 }
 237                 g_string_free(gs, TRUE);
 238         }
 239
 240         return SR_OK;
 241 }
 242
 243 SR_PRIV int dso_set_trigger_samplerate(struct dev_context *devc)
 244 {
 245         int ret, tmp;
 246         uint8_t cmdstring[12];
 247         uint16_t timebase_small[] = { 0xffff, 0xfffc, 0xfff7, 0xffe8, 0xffce,
 248                         0xff9c, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79, 0xd8f1 };
 249         uint16_t timebase_large[] = { 0xffff, 0x0000, 0xfffc, 0xfff7, 0xffe8,
 250                         0xffce, 0xff9d, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79 };
 251
 252         sr_dbg("hantek-dso: preparing CMD_SET_TRIGGER_SAMPLERATE");
 253
 254         memset(cmdstring, 0, sizeof(cmdstring));
 255         /* Command */
 256         cmdstring[0] = CMD_SET_TRIGGER_SAMPLERATE;
 257
 258         /* Trigger source */
 259         sr_dbg("hantek-dso: trigger source %s", devc->triggersource);
 260         if (!strcmp("CH2", devc->triggersource))
 261                 tmp = 0;
 262         else if (!strcmp("CH1", devc->triggersource))
 263                 tmp = 1;
 264         else if (!strcmp("EXT", devc->triggersource))
 265                 tmp = 2;
 266         else {
 267                 sr_err("hantek-dso: invalid trigger source %s", devc->triggersource);
 268                 return SR_ERR_ARG;
 269         }
 270         cmdstring[2] = tmp;
 271
 272         /* Frame size */
 273         sr_dbg("hantek-dso: frame size %d", devc->framesize);
 274         cmdstring[2] |= (devc->framesize == FRAMESIZE_SMALL ? 0x01 : 0x02) << 2;
 275
 276         /* Timebase fast */
 277         sr_dbg("hantek-dso: time base index %d", devc->timebase);
 278         switch (devc->framesize) {
 279         case FRAMESIZE_SMALL:
 280                 if (devc->timebase < TIME_20us)
 281                         tmp = 0;
 282                 else if (devc->timebase == TIME_20us)
 283                         tmp = 1;
 284                 else if (devc->timebase == TIME_40us)
 285                         tmp = 2;
 286                 else if (devc->timebase == TIME_100us)
 287                         tmp = 3;
 288                 else if (devc->timebase >= TIME_200us)
 289                         tmp = 4;
 290                 break;
 291         case FRAMESIZE_LARGE:
 292                 if (devc->timebase < TIME_40us) {
 293                         sr_err("hantek-dso: timebase < 40us only supported with 10K buffer");
 294                         return SR_ERR_ARG;
 295                 }
 296                 else if (devc->timebase == TIME_40us)
 297                         tmp = 0;
 298                 else if (devc->timebase == TIME_100us)
 299                         tmp = 2;
 300                 else if (devc->timebase == TIME_200us)
 301                         tmp = 3;
 302                 else if (devc->timebase >= TIME_400us)
 303                         tmp = 4;
 304                 break;
 305         }
 306         cmdstring[2] |= (tmp & 0x07) << 5;
 307
 308         /* Enabled channels: 00=CH1 01=CH2 10=both */
 309         sr_dbg("hantek-dso: channels CH1=%d CH2=%d", devc->ch1_enabled, devc->ch2_enabled);
 310         tmp = (((devc->ch2_enabled ? 1 : 0) << 1) + (devc->ch1_enabled ? 1 : 0)) - 1;
 311         cmdstring[3] = tmp;
 312
 313         /* Fast rates channel */
 314         /* TODO: is this right? */
 315         tmp = devc->timebase < TIME_10us ? 1 : 0;
 316         cmdstring[3] |= tmp << 2;
 317
 318         /* Trigger slope: 0=positive 1=negative */
 319         /* TODO: does this work? */
 320         sr_dbg("hantek-dso: trigger slope %d", devc->triggerslope);
 321         cmdstring[3] |= (devc->triggerslope == SLOPE_NEGATIVE ? 1 : 0) << 3;
 322
 323         /* Timebase slow */
 324         if (devc->timebase < TIME_100us)
 325                 tmp = 0;
 326         else if (devc->timebase > TIME_400ms)
 327                 tmp = 0xffed;
 328         else {
 329                 if (devc->framesize == FRAMESIZE_SMALL)
 330                         tmp = timebase_small[devc->timebase - 3];
 331                 else
 332                         tmp = timebase_large[devc->timebase - 3];
 333         }
 334         cmdstring[4] = tmp & 0xff;
 335         cmdstring[5] = (tmp >> 8) & 0xff;
 336
 337         /* Horizontal trigger position */
 338         sr_dbg("hantek-dso: trigger position %3.2f", devc->triggerposition);
 339         tmp = 0x77fff + 0x8000 * devc->triggerposition;
 340         cmdstring[6] = tmp & 0xff;
 341         cmdstring[7] = (tmp >> 8) & 0xff;
 342         cmdstring[10] = (tmp >> 16) & 0xff;
 343
 344         if (send_begin(devc) != SR_OK)
 345                 return SR_ERR;
 346
 347         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 348                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 349                         cmdstring, sizeof(cmdstring),
 350                         &tmp, 100)) != 0) {
 351                 sr_err("Failed to set trigger/samplerate: %d", ret);
 352                 return SR_ERR;
 353         }
 354         sr_dbg("hantek-dso: sent CMD_SET_TRIGGER_SAMPLERATE");
 355
 356         return SR_OK;
 357 }
 358
 359 SR_PRIV int dso_set_filters(struct dev_context *devc)
 360 {
 361         int ret, tmp;
 362         uint8_t cmdstring[8];
 363
 364         sr_dbg("hantek-dso: preparing CMD_SET_FILTERS");
 365
 366         memset(cmdstring, 0, sizeof(cmdstring));
 367         cmdstring[0] = CMD_SET_FILTERS;
 368         cmdstring[1] = 0x0f;
 369         if (devc->filter_ch1) {
 370                 sr_dbg("hantek-dso: turning on CH1 filter");
 371                 cmdstring[2] |= 0x80;
 372         }
 373         if (devc->filter_ch2) {
 374                 sr_dbg("hantek-dso: turning on CH2 filter");
 375                 cmdstring[2] |= 0x40;
 376         }
 377         if (devc->filter_trigger) {
 378                 /* TODO: supported on the DSO-2090? */
 379                 sr_dbg("hantek-dso: turning on trigger filter");
 380                 cmdstring[2] |= 0x20;
 381         }
 382
 383         if (send_begin(devc) != SR_OK)
 384                 return SR_ERR;
 385
 386         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 387                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 388                         cmdstring, sizeof(cmdstring),
 389                         &tmp, 100)) != 0) {
 390                 sr_err("Failed to set filters: %d", ret);
 391                 return SR_ERR;
 392         }
 393         sr_dbg("hantek-dso: sent CMD_SET_FILTERS");
 394
 395         return SR_OK;
 396 }
 397
 398 SR_PRIV int dso_set_voltage(struct dev_context *devc)
 399 {
 400         int ret, tmp;
 401         uint8_t cmdstring[8];
 402
 403         sr_dbg("hantek-dso: preparing CMD_SET_VOLTAGE");
 404
 405         memset(cmdstring, 0, sizeof(cmdstring));
 406         cmdstring[0] = CMD_SET_VOLTAGE;
 407         cmdstring[1] = 0x0f;
 408         cmdstring[2] = 0x30;
 409
 410         /* CH1 volts/div is encoded in bits 0-1 */
 411         sr_dbg("hantek-dso: CH1 vdiv index %d", devc->voltage_ch1);
 412         switch (devc->voltage_ch1) {
 413         case VDIV_1V:
 414         case VDIV_100MV:
 415         case VDIV_10MV:
 416                 cmdstring[2] |= 0x00;
 417                 break;
 418         case VDIV_2V:
 419         case VDIV_200MV:
 420         case VDIV_20MV:
 421                 cmdstring[2] |= 0x01;
 422                 break;
 423         case VDIV_5V:
 424         case VDIV_500MV:
 425         case VDIV_50MV:
 426                 cmdstring[2] |= 0x02;
 427                 break;
 428         }
 429
 430         /* CH2 volts/div is encoded in bits 2-3 */
 431         sr_dbg("hantek-dso: CH2 vdiv index %d", devc->voltage_ch2);
 432         switch (devc->voltage_ch2) {
 433         case VDIV_1V:
 434         case VDIV_100MV:
 435         case VDIV_10MV:
 436                 cmdstring[2] |= 0x00;
 437                 break;
 438         case VDIV_2V:
 439         case VDIV_200MV:
 440         case VDIV_20MV:
 441                 cmdstring[2] |= 0x04;
 442                 break;
 443         case VDIV_5V:
 444         case VDIV_500MV:
 445         case VDIV_50MV:
 446                 cmdstring[2] |= 0x08;
 447                 break;
 448         }
 449
 450         if (send_begin(devc) != SR_OK)
 451                 return SR_ERR;
 452
 453         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 454                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 455                         cmdstring, sizeof(cmdstring),
 456                         &tmp, 100)) != 0) {
 457                 sr_err("Failed to set voltage: %d", ret);
 458                 return SR_ERR;
 459         }
 460         sr_dbg("hantek-dso: sent CMD_SET_VOLTAGE");
 461
 462         return SR_OK;
 463 }
 464
 465 SR_PRIV int dso_set_relays(struct dev_context *devc)
 466 {
 467         GString *gs;
 468         int ret, i;
 469         uint8_t relays[17] = { 0x00, 0x04, 0x08, 0x02, 0x20, 0x40, 0x10, 0x01,
 470                         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 471
 472         sr_dbg("hantek-dso: preparing CTRL_SETRELAYS");
 473
 474         if (devc->voltage_ch1 < VDIV_1V)
 475                 relays[1] = ~relays[1];
 476
 477         if (devc->voltage_ch1 < VDIV_100MV)
 478                 relays[2] = ~relays[2];
 479
 480         sr_dbg("hantek-dso: CH1 coupling %d", devc->coupling_ch1);
 481         if (devc->coupling_ch1 != COUPLING_AC)
 482                 relays[3] = ~relays[3];
 483
 484         if (devc->voltage_ch2 < VDIV_1V)
 485                 relays[4] = ~relays[4];
 486
 487         if (devc->voltage_ch2 < VDIV_100MV)
 488                 relays[5] = ~relays[5];
 489
 490         sr_dbg("hantek-dso: CH2 coupling %d", devc->coupling_ch1);
 491         if (devc->coupling_ch2 != COUPLING_AC)
 492                 relays[6] = ~relays[6];
 493
 494         if (!strcmp(devc->triggersource, "EXT"))
 495                 relays[7] = ~relays[7];
 496
 497         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 498                 gs = g_string_sized_new(128);
 499                 g_string_printf(gs, "hantek-dso: relays:");
 500                 for (i = 0; i < 17; i++)
 501                         g_string_append_printf(gs, " %.2x", relays[i]);
 502                 sr_dbg(gs->str);
 503                 g_string_free(gs, TRUE);
 504         }
 505
 506         if ((ret = libusb_control_transfer(devc->usb->devhdl,
 507                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETRELAYS,
 508                         0, 0, relays, 17, 100)) != sizeof(relays)) {
 509                 sr_err("failed to set relays: %d", ret);
 510                 return SR_ERR;
 511         }
 512         sr_dbg("hantek-dso: sent CTRL_SETRELAYS");
 513
 514         return SR_OK;
 515 }
 516
 517 SR_PRIV int dso_set_voffsets(struct dev_context *devc)
 518 {
 519         int offset, ret;
 520         uint16_t *ch_levels;
 521         uint8_t offsets[17];
 522
 523         sr_dbg("hantek-dso: preparing CTRL_SETOFFSET");
 524
 525         memset(offsets, 0, sizeof(offsets));
 526         /* Channel 1 */
 527         ch_levels = devc->channel_levels[0][devc->voltage_ch1];
 528         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch1 + ch_levels[0];
 529         offsets[0] = (offset >> 8) | 0x20;
 530         offsets[1] = offset & 0xff;
 531         sr_dbg("hantek-dso: CH1 offset %3.2f (%.2x%.2x)", devc->voffset_ch1,
 532                         offsets[0], offsets[1]);
 533
 534         /* Channel 2 */
 535         ch_levels = devc->channel_levels[1][devc->voltage_ch2];
 536         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch2 + ch_levels[0];
 537         offsets[2] = (offset >> 8) | 0x20;
 538         offsets[3] = offset & 0xff;
 539         sr_dbg("hantek-dso: CH2 offset %3.2f (%.2x%.2x)", devc->voffset_ch2,
 540                         offsets[2], offsets[3]);
 541
 542         /* Trigger */
 543         offset = MAX_VERT_TRIGGER * devc->voffset_trigger;
 544         offsets[4] = (offset >> 8) | 0x20;
 545         offsets[5] = offset & 0xff;
 546         sr_dbg("hantek-dso: trigger offset %3.2f (%.2x%.2x)", devc->voffset_trigger,
 547                         offsets[4], offsets[5]);
 548
 549         if ((ret = libusb_control_transfer(devc->usb->devhdl,
 550                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETOFFSET,
 551                         0, 0, offsets, sizeof(offsets), 100)) != sizeof(offsets)) {
 552                 sr_err("failed to set offsets: %d", ret);
 553                 return SR_ERR;
 554         }
 555         sr_dbg("hantek-dso: sent CTRL_SETOFFSET");
 556
 557         return SR_OK;
 558 }
 559
 560 SR_PRIV int dso_enable_trigger(struct dev_context *devc)
 561 {
 562         int ret, tmp;
 563         uint8_t cmdstring[2];
 564
 565         sr_dbg("hantek-dso: sending CMD_ENABLE_TRIGGER");
 566
 567         memset(cmdstring, 0, sizeof(cmdstring));
 568         cmdstring[0] = CMD_ENABLE_TRIGGER;
 569         cmdstring[1] = 0x00;
 570
 571         if (send_begin(devc) != SR_OK)
 572                 return SR_ERR;
 573
 574         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 575                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 576                         cmdstring, sizeof(cmdstring),
 577                         &tmp, 100)) != 0) {
 578                 sr_err("Failed to enable trigger: %d", ret);
 579                 return SR_ERR;
 580         }
 581
 582         return SR_OK;
 583 }
 584
 585 SR_PRIV int dso_force_trigger(struct dev_context *devc)
 586 {
 587         int ret, tmp;
 588         uint8_t cmdstring[2];
 589
 590         sr_dbg("hantek-dso: sending CMD_FORCE_TRIGGER");
 591
 592         memset(cmdstring, 0, sizeof(cmdstring));
 593         cmdstring[0] = CMD_FORCE_TRIGGER;
 594         cmdstring[1] = 0x00;
 595
 596         if (send_begin(devc) != SR_OK)
 597                 return SR_ERR;
 598
 599         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 600                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 601                         cmdstring, sizeof(cmdstring),
 602                         &tmp, 100)) != 0) {
 603                 sr_err("Failed to force trigger: %d", ret);
 604                 return SR_ERR;
 605         }
 606
 607         return SR_OK;
 608 }
 609
 610 SR_PRIV int dso_init(struct dev_context *devc)
 611 {
 612
 613         sr_dbg("hantek-dso: initializing dso");
 614
 615         if (get_channel_offsets(devc) != SR_OK)
 616                 return SR_ERR;
 617
 618         if (dso_set_trigger_samplerate(devc) != SR_OK)
 619                 return SR_ERR;
 620
 621         if (dso_set_filters(devc) != SR_OK)
 622                 return SR_ERR;
 623
 624         if (dso_set_voltage(devc) != SR_OK)
 625                 return SR_ERR;
 626
 627         if (dso_set_relays(devc) != SR_OK)
 628                 return SR_ERR;
 629
 630         if (dso_set_voffsets(devc) != SR_OK)
 631                 return SR_ERR;
 632
 633         if (dso_enable_trigger(devc) != SR_OK)
 634                 return SR_ERR;
 635
 636         return SR_OK;
 637 }
 638
 639 SR_PRIV int dso_get_capturestate(struct dev_context *devc, uint8_t *capturestate,
 640                 uint32_t *trigger_offset)
 641 {
 642         int ret, tmp, i;
 643         unsigned int bitvalue, toff;
 644         uint8_t cmdstring[2], inbuf[512];
 645
 646         sr_dbg("hantek-dso: sending CMD_GET_CAPTURESTATE");
 647
 648         cmdstring[0] = CMD_GET_CAPTURESTATE;
 649         cmdstring[1] = 0;
 650
 651         if ((ret = send_bulkcmd(devc, cmdstring, sizeof(cmdstring))) != SR_OK) {
 652                 sr_dbg("Failed to send get_capturestate command: %d", ret);
 653                 return SR_ERR;
 654         }
 655
 656         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 657                         DSO_EP_IN | LIBUSB_ENDPOINT_IN,
 658                         inbuf, 512, &tmp, 100)) != 0) {
 659                 sr_dbg("Failed to get capturestate: %d", ret);
 660                 return SR_ERR;
 661         }
 662         *capturestate = inbuf[0];
 663         toff = (inbuf[1] << 16) | (inbuf[3] << 8) | inbuf[2];
 664
 665         /* This conversion comes from the openhantek project.
 666          * Each set bit in the 24-bit value inverts all bits with a lower
 667          * value. No idea why the device reports the trigger point this way.
 668          */
 669         bitvalue = 1;
 670         for (i = 0; i < 24; i++) {
 671                 /* Each set bit inverts all bits with a lower value. */
 672                 if(toff & bitvalue)
 673                         toff ^= bitvalue - 1;
 674                 bitvalue <<= 1;
 675         }
 676         *trigger_offset = toff;
 677
 678         return SR_OK;
 679 }
 680
 681 SR_PRIV int dso_capture_start(struct dev_context *devc)
 682 {
 683         int ret;
 684         uint8_t cmdstring[2];
 685
 686         sr_dbg("hantek-dso: sending CMD_CAPTURE_START");
 687
 688         cmdstring[0] = CMD_CAPTURE_START;
 689         cmdstring[1] = 0;
 690
 691         if ((ret = send_bulkcmd(devc, cmdstring, sizeof(cmdstring))) != SR_OK) {
 692                 sr_err("Failed to send capture_start command: %d", ret);
 693                 return SR_ERR;
 694         }
 695
 696         return SR_OK;
 697 }
 698
 699 SR_PRIV int dso_get_channeldata(struct dev_context *devc, libusb_transfer_cb_fn cb)
 700 {
 701         struct libusb_transfer *transfer;
 702         int num_transfers, ret, i;
 703         uint8_t cmdstring[2];
 704         unsigned char *buf;
 705
 706         sr_dbg("hantek-dso: sending CMD_GET_CHANNELDATA");
 707
 708         cmdstring[0] = CMD_GET_CHANNELDATA;
 709         cmdstring[1] = 0;
 710
 711         if ((ret = send_bulkcmd(devc, cmdstring, sizeof(cmdstring))) != SR_OK) {
 712                 sr_err("Failed to get channel data: %d", ret);
 713                 return SR_ERR;
 714         }
 715
 716         /* TODO: dso-2xxx only */
 717         num_transfers = devc->framesize * sizeof(unsigned short) / devc->epin_maxpacketsize;
 718         sr_dbg("hantek-dso: queueing up %d transfers", num_transfers);
 719         for (i = 0; i < num_transfers; i++) {
 720                 if (!(buf = g_try_malloc(devc->epin_maxpacketsize))) {
 721                         sr_err("hantek-dso: %s: buf malloc failed", __func__);
 722                         return SR_ERR_MALLOC;
 723                 }
 724                 transfer = libusb_alloc_transfer(0);
 725                 libusb_fill_bulk_transfer(transfer, devc->usb->devhdl,
 726                                 DSO_EP_IN | LIBUSB_ENDPOINT_IN, buf,
 727                                 devc->epin_maxpacketsize, cb, devc, 40);
 728                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 729                         sr_err("failed to submit transfer: %d", ret);
 730                         /* TODO: Free them all. */
 731                         libusb_free_transfer(transfer);
 732                         g_free(buf);
 733                         return SR_ERR;
 734                 }
 735         }
 736
 737         return SR_OK;
 738 }
 739