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 static int send_begin(struct dev_context *devc)
  32 {
  33         int ret;
  34         unsigned char buffer[] = {0x0f, 0x03, 0x03, 0x03, 0x68, 0xac, 0xfe,
  35         0x00, 0x01, 0x00};
  36
  37         sr_dbg("Sending CTRL_BEGINCOMMAND.");
  38
  39         if ((ret = libusb_control_transfer(devc->usb->devhdl,
  40                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_BEGINCOMMAND,
  41                         0, 0, buffer, sizeof(buffer), 200)) != sizeof(buffer)) {
  42                 sr_err("Failed to send begincommand: %d.", ret);
  43                 return SR_ERR;
  44         }
  45
  46         return SR_OK;
  47 }
  48
  49 static int send_bulkcmd(struct dev_context *devc, uint8_t *cmdstring, int cmdlen)
  50 {
  51         int ret, tmp;
  52
  53         if (send_begin(devc) != SR_OK)
  54                 return SR_ERR;
  55
  56         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
  57                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
  58                         cmdstring, cmdlen, &tmp, 200)) != 0)
  59                 return SR_ERR;
  60
  61         return SR_OK;
  62 }
  63
  64 SR_PRIV int dso_getmps(libusb_device *dev)
  65 {
  66         struct libusb_device_descriptor des;
  67         struct libusb_config_descriptor *conf_dsc;
  68         const struct libusb_interface_descriptor *intf_dsc;
  69         int mps;
  70
  71         if (libusb_get_device_descriptor(dev, &des) != 0)
  72                 return 0;
  73
  74         if (des.bNumConfigurations != 1)
  75                 return 0;
  76
  77         if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
  78                 return 0;
  79
  80         mps = 0;
  81         intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
  82         if (intf_dsc->bNumEndpoints != 2)
  83                 goto err;
  84
  85         if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
  86             (2 | LIBUSB_ENDPOINT_OUT))
  87                 /* The first endpoint should be 2 (outbound). */
  88                 goto err;
  89
  90         if ((intf_dsc->endpoint[1].bEndpointAddress & 0x8f) !=
  91             (6 | LIBUSB_ENDPOINT_IN))
  92                 /* The second endpoint should be 6 (inbound). */
  93                 goto err;
  94
  95         mps = intf_dsc->endpoint[1].wMaxPacketSize;
  96
  97 err:
  98         if (conf_dsc)
  99                 libusb_free_config_descriptor(conf_dsc);
 100
 101         return mps;
 102 }
 103
 104 SR_PRIV int dso_open(struct sr_dev_inst *sdi)
 105 {
 106         libusb_device **devlist;
 107         struct libusb_device_descriptor des;
 108         struct dev_context *devc;
 109         struct drv_context *drvc = hantek_dso_driver_info.priv;
 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(drvc->sr_ctx->libusb_ctx, &devlist);
 120         for (i = 0; devlist[i]; i++) {
 121                 if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
 122                         sr_err("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("Wrong endpoint profile.");
 157                         else {
 158                                 sdi->status = SR_ST_ACTIVE;
 159                                 sr_info("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("Failed to open device: %d.", err);
 165                 }
 166
 167                 /* If we made it here, we handled the device (somehow). */
 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("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("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] =
 221                                 g_ntohs(devc->channel_levels[chan][v][0]);
 222                         devc->channel_levels[chan][v][1] =
 223                                 g_ntohs(devc->channel_levels[chan][v][1]);
 224                 }
 225         }
 226
 227         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 228                 gs = g_string_sized_new(128);
 229                 for (chan = 0; chan < 2; chan++) {
 230                         g_string_printf(gs, "CH%d:", chan + 1);
 231                         for (v = 0; v < 9; v++) {
 232                                 g_string_append_printf(gs, " %.4x-%.4x",
 233                                         devc->channel_levels[chan][v][0],
 234                                         devc->channel_levels[chan][v][1]);
 235                         }
 236                         sr_dbg(gs->str);
 237                 }
 238                 g_string_free(gs, TRUE);
 239         }
 240
 241         return SR_OK;
 242 }
 243
 244 SR_PRIV int dso_set_trigger_samplerate(struct dev_context *devc)
 245 {
 246         int ret, tmp;
 247         uint8_t cmdstring[12];
 248         uint16_t timebase_small[] = { 0xffff, 0xfffc, 0xfff7, 0xffe8, 0xffce,
 249                 0xff9c, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79, 0xd8f1 };
 250         uint16_t timebase_large[] = { 0xffff, 0x0000, 0xfffc, 0xfff7, 0xffe8,
 251                 0xffce, 0xff9d, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79 };
 252
 253         sr_dbg("Preparing CMD_SET_TRIGGER_SAMPLERATE.");
 254
 255         memset(cmdstring, 0, sizeof(cmdstring));
 256         /* Command */
 257         cmdstring[0] = CMD_SET_TRIGGER_SAMPLERATE;
 258
 259         /* Trigger source */
 260         sr_dbg("Trigger source %s.", devc->triggersource);
 261         if (!strcmp("CH2", devc->triggersource))
 262                 tmp = 0;
 263         else if (!strcmp("CH1", devc->triggersource))
 264                 tmp = 1;
 265         else if (!strcmp("EXT", devc->triggersource))
 266                 tmp = 2;
 267         else {
 268                 sr_err("Invalid trigger source: '%s'.", devc->triggersource);
 269                 return SR_ERR_ARG;
 270         }
 271         cmdstring[2] = tmp;
 272
 273         /* Frame size */
 274         sr_dbg("Frame size: %d.", devc->framesize);
 275         cmdstring[2] |= (devc->framesize == FRAMESIZE_SMALL ? 0x01 : 0x02) << 2;
 276
 277         /* Timebase fast */
 278         sr_dbg("Time base index: %d.", devc->timebase);
 279         switch (devc->framesize) {
 280         case FRAMESIZE_SMALL:
 281                 if (devc->timebase < TIME_20us)
 282                         tmp = 0;
 283                 else if (devc->timebase == TIME_20us)
 284                         tmp = 1;
 285                 else if (devc->timebase == TIME_40us)
 286                         tmp = 2;
 287                 else if (devc->timebase == TIME_100us)
 288                         tmp = 3;
 289                 else if (devc->timebase >= TIME_200us)
 290                         tmp = 4;
 291                 break;
 292         case FRAMESIZE_LARGE:
 293                 if (devc->timebase < TIME_40us) {
 294                         sr_err("Timebase < 40us only supported with 10K buffer.");
 295                         return SR_ERR_ARG;
 296                 }
 297                 else if (devc->timebase == TIME_40us)
 298                         tmp = 0;
 299                 else if (devc->timebase == TIME_100us)
 300                         tmp = 2;
 301                 else if (devc->timebase == TIME_200us)
 302                         tmp = 3;
 303                 else if (devc->timebase >= TIME_400us)
 304                         tmp = 4;
 305                 break;
 306         }
 307         cmdstring[2] |= (tmp & 0x07) << 5;
 308
 309         /* Enabled channels: 00=CH1 01=CH2 10=both */
 310         sr_dbg("Channels CH1=%d CH2=%d", devc->ch1_enabled, devc->ch2_enabled);
 311         tmp = (((devc->ch2_enabled ? 1 : 0) << 1) + (devc->ch1_enabled ? 1 : 0)) - 1;
 312         cmdstring[3] = tmp;
 313
 314         /* Fast rates channel */
 315         /* TODO: Is this right? */
 316         tmp = devc->timebase < TIME_10us ? 1 : 0;
 317         cmdstring[3] |= tmp << 2;
 318
 319         /* Trigger slope: 0=positive 1=negative */
 320         /* TODO: Does this work? */
 321         sr_dbg("Trigger slope: %d.", devc->triggerslope);
 322         cmdstring[3] |= (devc->triggerslope == SLOPE_NEGATIVE ? 1 : 0) << 3;
 323
 324         /* Timebase slow */
 325         if (devc->timebase < TIME_100us)
 326                 tmp = 0;
 327         else if (devc->timebase > TIME_400ms)
 328                 tmp = 0xffed;
 329         else {
 330                 if (devc->framesize == FRAMESIZE_SMALL)
 331                         tmp = timebase_small[devc->timebase - 3];
 332                 else
 333                         tmp = timebase_large[devc->timebase - 3];
 334         }
 335         cmdstring[4] = tmp & 0xff;
 336         cmdstring[5] = (tmp >> 8) & 0xff;
 337
 338         /* Horizontal trigger position */
 339         sr_dbg("Trigger position: %3.2f.", devc->triggerposition);
 340         tmp = 0x77fff + 0x8000 * devc->triggerposition;
 341         cmdstring[6] = tmp & 0xff;
 342         cmdstring[7] = (tmp >> 8) & 0xff;
 343         cmdstring[10] = (tmp >> 16) & 0xff;
 344
 345         if (send_begin(devc) != SR_OK)
 346                 return SR_ERR;
 347
 348         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 349                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 350                         cmdstring, sizeof(cmdstring),
 351                         &tmp, 100)) != 0) {
 352                 sr_err("Failed to set trigger/samplerate: %d.", ret);
 353                 return SR_ERR;
 354         }
 355         sr_dbg("Sent CMD_SET_TRIGGER_SAMPLERATE.");
 356
 357         return SR_OK;
 358 }
 359
 360 SR_PRIV int dso_set_filters(struct dev_context *devc)
 361 {
 362         int ret, tmp;
 363         uint8_t cmdstring[8];
 364
 365         sr_dbg("Preparing CMD_SET_FILTERS.");
 366
 367         memset(cmdstring, 0, sizeof(cmdstring));
 368         cmdstring[0] = CMD_SET_FILTERS;
 369         cmdstring[1] = 0x0f;
 370         if (devc->filter_ch1) {
 371                 sr_dbg("Turning on CH1 filter.");
 372                 cmdstring[2] |= 0x80;
 373         }
 374         if (devc->filter_ch2) {
 375                 sr_dbg("Turning on CH2 filter.");
 376                 cmdstring[2] |= 0x40;
 377         }
 378         if (devc->filter_trigger) {
 379                 /* TODO: supported on the DSO-2090? */
 380                 sr_dbg("Turning on trigger filter.");
 381                 cmdstring[2] |= 0x20;
 382         }
 383
 384         if (send_begin(devc) != SR_OK)
 385                 return SR_ERR;
 386
 387         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 388                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 389                         cmdstring, sizeof(cmdstring),
 390                         &tmp, 100)) != 0) {
 391                 sr_err("Failed to set filters: %d", ret);
 392                 return SR_ERR;
 393         }
 394         sr_dbg("Sent CMD_SET_FILTERS.");
 395
 396         return SR_OK;
 397 }
 398
 399 SR_PRIV int dso_set_voltage(struct dev_context *devc)
 400 {
 401         int ret, tmp;
 402         uint8_t cmdstring[8];
 403
 404         sr_dbg("Preparing CMD_SET_VOLTAGE.");
 405
 406         memset(cmdstring, 0, sizeof(cmdstring));
 407         cmdstring[0] = CMD_SET_VOLTAGE;
 408         cmdstring[1] = 0x0f;
 409         cmdstring[2] = 0x30;
 410
 411         /* CH1 volts/div is encoded in bits 0-1 */
 412         sr_dbg("CH1 vdiv index: %d.", devc->voltage_ch1);
 413         switch (devc->voltage_ch1) {
 414         case VDIV_1V:
 415         case VDIV_100MV:
 416         case VDIV_10MV:
 417                 cmdstring[2] |= 0x00;
 418                 break;
 419         case VDIV_2V:
 420         case VDIV_200MV:
 421         case VDIV_20MV:
 422                 cmdstring[2] |= 0x01;
 423                 break;
 424         case VDIV_5V:
 425         case VDIV_500MV:
 426         case VDIV_50MV:
 427                 cmdstring[2] |= 0x02;
 428                 break;
 429         }
 430
 431         /* CH2 volts/div is encoded in bits 2-3 */
 432         sr_dbg("CH2 vdiv index: %d.", devc->voltage_ch2);
 433         switch (devc->voltage_ch2) {
 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] |= 0x04;
 443                 break;
 444         case VDIV_5V:
 445         case VDIV_500MV:
 446         case VDIV_50MV:
 447                 cmdstring[2] |= 0x08;
 448                 break;
 449         }
 450
 451         if (send_begin(devc) != SR_OK)
 452                 return SR_ERR;
 453
 454         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 455                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 456                         cmdstring, sizeof(cmdstring),
 457                         &tmp, 100)) != 0) {
 458                 sr_err("Failed to set voltage: %d.", ret);
 459                 return SR_ERR;
 460         }
 461         sr_dbg("Sent CMD_SET_VOLTAGE.");
 462
 463         return SR_OK;
 464 }
 465
 466 SR_PRIV int dso_set_relays(struct dev_context *devc)
 467 {
 468         GString *gs;
 469         int ret, i;
 470         uint8_t relays[17] = { 0x00, 0x04, 0x08, 0x02, 0x20, 0x40, 0x10, 0x01,
 471                         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 472
 473         sr_dbg("Preparing CTRL_SETRELAYS.");
 474
 475         if (devc->voltage_ch1 < VDIV_1V)
 476                 relays[1] = ~relays[1];
 477
 478         if (devc->voltage_ch1 < VDIV_100MV)
 479                 relays[2] = ~relays[2];
 480
 481         sr_dbg("CH1 coupling: %d.", devc->coupling_ch1);
 482         if (devc->coupling_ch1 != COUPLING_AC)
 483                 relays[3] = ~relays[3];
 484
 485         if (devc->voltage_ch2 < VDIV_1V)
 486                 relays[4] = ~relays[4];
 487
 488         if (devc->voltage_ch2 < VDIV_100MV)
 489                 relays[5] = ~relays[5];
 490
 491         sr_dbg("CH2 coupling: %d.", devc->coupling_ch1);
 492         if (devc->coupling_ch2 != COUPLING_AC)
 493                 relays[6] = ~relays[6];
 494
 495         if (!strcmp(devc->triggersource, "EXT"))
 496                 relays[7] = ~relays[7];
 497
 498         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 499                 gs = g_string_sized_new(128);
 500                 g_string_printf(gs, "Relays:");
 501                 for (i = 0; i < 17; i++)
 502                         g_string_append_printf(gs, " %.2x", relays[i]);
 503                 sr_dbg(gs->str);
 504                 g_string_free(gs, TRUE);
 505         }
 506
 507         if ((ret = libusb_control_transfer(devc->usb->devhdl,
 508                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETRELAYS,
 509                         0, 0, relays, 17, 100)) != sizeof(relays)) {
 510                 sr_err("Failed to set relays: %d.", ret);
 511                 return SR_ERR;
 512         }
 513         sr_dbg("Sent CTRL_SETRELAYS.");
 514
 515         return SR_OK;
 516 }
 517
 518 SR_PRIV int dso_set_voffsets(struct dev_context *devc)
 519 {
 520         int offset, ret;
 521         uint16_t *ch_levels;
 522         uint8_t offsets[17];
 523
 524         sr_dbg("Preparing CTRL_SETOFFSET.");
 525
 526         memset(offsets, 0, sizeof(offsets));
 527         /* Channel 1 */
 528         ch_levels = devc->channel_levels[0][devc->voltage_ch1];
 529         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch1 + ch_levels[0];
 530         offsets[0] = (offset >> 8) | 0x20;
 531         offsets[1] = offset & 0xff;
 532         sr_dbg("CH1 offset: %3.2f (%.2x%.2x).", devc->voffset_ch1,
 533                offsets[0], offsets[1]);
 534
 535         /* Channel 2 */
 536         ch_levels = devc->channel_levels[1][devc->voltage_ch2];
 537         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch2 + ch_levels[0];
 538         offsets[2] = (offset >> 8) | 0x20;
 539         offsets[3] = offset & 0xff;
 540         sr_dbg("CH2 offset: %3.2f (%.2x%.2x).", devc->voffset_ch2,
 541                offsets[2], offsets[3]);
 542
 543         /* Trigger */
 544         offset = MAX_VERT_TRIGGER * devc->voffset_trigger;
 545         offsets[4] = (offset >> 8) | 0x20;
 546         offsets[5] = offset & 0xff;
 547         sr_dbg("Trigger offset: %3.2f (%.2x%.2x).", devc->voffset_trigger,
 548                         offsets[4], offsets[5]);
 549
 550         if ((ret = libusb_control_transfer(devc->usb->devhdl,
 551                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETOFFSET,
 552                         0, 0, offsets, sizeof(offsets), 100)) != sizeof(offsets)) {
 553                 sr_err("Failed to set offsets: %d.", ret);
 554                 return SR_ERR;
 555         }
 556         sr_dbg("Sent CTRL_SETOFFSET.");
 557
 558         return SR_OK;
 559 }
 560
 561 SR_PRIV int dso_enable_trigger(struct dev_context *devc)
 562 {
 563         int ret, tmp;
 564         uint8_t cmdstring[2];
 565
 566         sr_dbg("Sending CMD_ENABLE_TRIGGER.");
 567
 568         memset(cmdstring, 0, sizeof(cmdstring));
 569         cmdstring[0] = CMD_ENABLE_TRIGGER;
 570         cmdstring[1] = 0x00;
 571
 572         if (send_begin(devc) != SR_OK)
 573                 return SR_ERR;
 574
 575         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 576                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 577                         cmdstring, sizeof(cmdstring),
 578                         &tmp, 100)) != 0) {
 579                 sr_err("Failed to enable trigger: %d.", ret);
 580                 return SR_ERR;
 581         }
 582
 583         return SR_OK;
 584 }
 585
 586 SR_PRIV int dso_force_trigger(struct dev_context *devc)
 587 {
 588         int ret, tmp;
 589         uint8_t cmdstring[2];
 590
 591         sr_dbg("Sending CMD_FORCE_TRIGGER.");
 592
 593         memset(cmdstring, 0, sizeof(cmdstring));
 594         cmdstring[0] = CMD_FORCE_TRIGGER;
 595         cmdstring[1] = 0x00;
 596
 597         if (send_begin(devc) != SR_OK)
 598                 return SR_ERR;
 599
 600         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 601                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 602                         cmdstring, sizeof(cmdstring),
 603                         &tmp, 100)) != 0) {
 604                 sr_err("Failed to force trigger: %d.", ret);
 605                 return SR_ERR;
 606         }
 607
 608         return SR_OK;
 609 }
 610
 611 SR_PRIV int dso_init(struct dev_context *devc)
 612 {
 613
 614         sr_dbg("Initializing DSO.");
 615
 616         if (get_channel_offsets(devc) != SR_OK)
 617                 return SR_ERR;
 618
 619         if (dso_set_trigger_samplerate(devc) != SR_OK)
 620                 return SR_ERR;
 621
 622         if (dso_set_filters(devc) != SR_OK)
 623                 return SR_ERR;
 624
 625         if (dso_set_voltage(devc) != SR_OK)
 626                 return SR_ERR;
 627
 628         if (dso_set_relays(devc) != SR_OK)
 629                 return SR_ERR;
 630
 631         if (dso_set_voffsets(devc) != SR_OK)
 632                 return SR_ERR;
 633
 634         if (dso_enable_trigger(devc) != SR_OK)
 635                 return SR_ERR;
 636
 637         return SR_OK;
 638 }
 639
 640 SR_PRIV int dso_get_capturestate(struct dev_context *devc,
 641                                  uint8_t *capturestate,
 642                                  uint32_t *trigger_offset)
 643 {
 644         int ret, tmp, i;
 645         unsigned int bitvalue, toff;
 646         uint8_t cmdstring[2], inbuf[512];
 647
 648         sr_dbg("Sending CMD_GET_CAPTURESTATE.");
 649
 650         cmdstring[0] = CMD_GET_CAPTURESTATE;
 651         cmdstring[1] = 0;
 652
 653         if ((ret = send_bulkcmd(devc, cmdstring, sizeof(cmdstring))) != SR_OK) {
 654                 sr_dbg("Failed to send get_capturestate command: %d.", ret);
 655                 return SR_ERR;
 656         }
 657
 658         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 659                         DSO_EP_IN | LIBUSB_ENDPOINT_IN,
 660                         inbuf, 512, &tmp, 100)) != 0) {
 661                 sr_dbg("Failed to get capturestate: %d.", ret);
 662                 return SR_ERR;
 663         }
 664         *capturestate = inbuf[0];
 665         toff = (inbuf[1] << 16) | (inbuf[3] << 8) | inbuf[2];
 666
 667         /*
 668          * This conversion comes from the openhantek project.
 669          * Each set bit in the 24-bit value inverts all bits with a lower
 670          * value. No idea why the device reports the trigger point this way.
 671          */
 672         bitvalue = 1;
 673         for (i = 0; i < 24; i++) {
 674                 /* Each set bit inverts all bits with a lower value. */
 675                 if(toff & bitvalue)
 676                         toff ^= bitvalue - 1;
 677                 bitvalue <<= 1;
 678         }
 679         *trigger_offset = toff;
 680
 681         return SR_OK;
 682 }
 683
 684 SR_PRIV int dso_capture_start(struct dev_context *devc)
 685 {
 686         int ret;
 687         uint8_t cmdstring[2];
 688
 689         sr_dbg("Sending CMD_CAPTURE_START.");
 690
 691         cmdstring[0] = CMD_CAPTURE_START;
 692         cmdstring[1] = 0;
 693
 694         if ((ret = send_bulkcmd(devc, cmdstring, sizeof(cmdstring))) != SR_OK) {
 695                 sr_err("Failed to send capture_start command: %d.", ret);
 696                 return SR_ERR;
 697         }
 698
 699         return SR_OK;
 700 }
 701
 702 SR_PRIV int dso_get_channeldata(struct dev_context *devc, libusb_transfer_cb_fn cb)
 703 {
 704         struct libusb_transfer *transfer;
 705         int num_transfers, ret, i;
 706         uint8_t cmdstring[2];
 707         unsigned char *buf;
 708
 709         sr_dbg("Sending CMD_GET_CHANNELDATA.");
 710
 711         cmdstring[0] = CMD_GET_CHANNELDATA;
 712         cmdstring[1] = 0;
 713
 714         if ((ret = send_bulkcmd(devc, cmdstring, sizeof(cmdstring))) != SR_OK) {
 715                 sr_err("Failed to get channel data: %d.", ret);
 716                 return SR_ERR;
 717         }
 718
 719         /* TODO: DSO-2xxx only. */
 720         num_transfers = devc->framesize *
 721                         sizeof(unsigned short) / devc->epin_maxpacketsize;
 722         sr_dbg("Queueing up %d transfers.", num_transfers);
 723         for (i = 0; i < num_transfers; i++) {
 724                 if (!(buf = g_try_malloc(devc->epin_maxpacketsize))) {
 725                         sr_err("Failed to malloc USB endpoint buffer.");
 726                         return SR_ERR_MALLOC;
 727                 }
 728                 transfer = libusb_alloc_transfer(0);
 729                 libusb_fill_bulk_transfer(transfer, devc->usb->devhdl,
 730                                 DSO_EP_IN | LIBUSB_ENDPOINT_IN, buf,
 731                                 devc->epin_maxpacketsize, cb, devc, 40);
 732                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 733                         sr_err("Failed to submit transfer: %d.", ret);
 734                         /* TODO: Free them all. */
 735                         libusb_free_transfer(transfer);
 736                         g_free(buf);
 737                         return SR_ERR;
 738                 }
 739         }
 740
 741         return SR_OK;
 742 }