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 static struct sr_dev_driver *hdi = &hantek_dso_driver_info;
  32
  33
  34 static int send_begin(struct dev_context *devc)
  35 {
  36         int ret;
  37         unsigned char buffer[] = {0x0f, 0x03, 0x03, 0x03, 0x68, 0xac, 0xfe,
  38         0x00, 0x01, 0x00};
  39
  40         sr_dbg("hantek-dso: sending CTRL_BEGINCOMMAND");
  41
  42         if ((ret = libusb_control_transfer(devc->usb->devhdl,
  43                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_BEGINCOMMAND,
  44                         0, 0, buffer, sizeof(buffer), 200)) != sizeof(buffer)) {
  45                 sr_err("failed to send begincommand: %d", ret);
  46                 return SR_ERR;
  47         }
  48
  49         return SR_OK;
  50 }
  51
  52 static int send_bulkcmd(struct dev_context *devc, uint8_t *cmdstring, int cmdlen)
  53 {
  54         int ret, tmp;
  55
  56         if (send_begin(devc) != SR_OK)
  57                 return SR_ERR;
  58
  59         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
  60                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
  61                         cmdstring, cmdlen, &tmp, 200)) != 0)
  62                 return SR_ERR;
  63
  64         return SR_OK;
  65 }
  66
  67 SR_PRIV int dso_getmps(libusb_device *dev)
  68 {
  69         struct libusb_device_descriptor des;
  70         struct libusb_config_descriptor *conf_dsc;
  71         const struct libusb_interface_descriptor *intf_dsc;
  72         int mps;
  73
  74         if (libusb_get_device_descriptor(dev, &des) != 0)
  75                 return 0;
  76
  77         if (des.bNumConfigurations != 1)
  78                 return 0;
  79
  80         if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
  81                 return 0;
  82
  83         mps = 0;
  84         intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
  85         if (intf_dsc->bNumEndpoints != 2)
  86                 goto err;
  87
  88         if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
  89             (2 | LIBUSB_ENDPOINT_OUT))
  90                 /* The first endpoint should be 2 (outbound). */
  91                 goto err;
  92
  93         if ((intf_dsc->endpoint[1].bEndpointAddress & 0x8f) !=
  94             (6 | LIBUSB_ENDPOINT_IN))
  95                 /* The second endpoint should be 6 (inbound). */
  96                 goto err;
  97
  98         mps = intf_dsc->endpoint[1].wMaxPacketSize;
  99
 100 err:
 101         if (conf_dsc)
 102                 libusb_free_config_descriptor(conf_dsc);
 103
 104         return mps;
 105 }
 106
 107 SR_PRIV int dso_open(struct sr_dev_inst *sdi)
 108 {
 109         libusb_device **devlist;
 110         struct libusb_device_descriptor des;
 111         struct drv_context *drvc;
 112         struct dev_context *devc;
 113         int err, skip, i;
 114
 115         drvc = hdi->priv;
 116         devc = sdi->priv;
 117
 118         if (sdi->status == SR_ST_ACTIVE)
 119                 /* already in use */
 120                 return SR_ERR;
 121
 122         skip = 0;
 123         libusb_get_device_list(drvc->usb_context, &devlist);
 124         for (i = 0; devlist[i]; i++) {
 125                 if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
 126                         sr_err("hantek-dso: failed to get device descriptor: %d", err);
 127                         continue;
 128                 }
 129
 130                 if (des.idVendor != devc->profile->fw_vid
 131                     || des.idProduct != devc->profile->fw_pid)
 132                         continue;
 133
 134                 if (sdi->status == SR_ST_INITIALIZING) {
 135                         if (skip != sdi->index) {
 136                                 /* Skip devices of this type that aren't the one we want. */
 137                                 skip += 1;
 138                                 continue;
 139                         }
 140                 } else if (sdi->status == SR_ST_INACTIVE) {
 141                         /*
 142                          * This device is fully enumerated, so we need to find
 143                          * this device by vendor, product, bus and address.
 144                          */
 145                         if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
 146                                 || libusb_get_device_address(devlist[i]) != devc->usb->address)
 147                                 /* this is not the one */
 148                                 continue;
 149                 }
 150
 151                 if (!(err = libusb_open(devlist[i], &devc->usb->devhdl))) {
 152                         if (devc->usb->address == 0xff)
 153                                 /*
 154                                  * first time we touch this device after firmware upload,
 155                                  * so we don't know the address yet.
 156                                  */
 157                                 devc->usb->address = libusb_get_device_address(devlist[i]);
 158
 159                         if(!(devc->epin_maxpacketsize = dso_getmps(devlist[i])))
 160                                 sr_err("hantek-dso: wrong endpoint profile");
 161                         else {
 162                                 sdi->status = SR_ST_ACTIVE;
 163                                 sr_info("hantek-dso: opened device %d on %d.%d interface %d",
 164                                         sdi->index, devc->usb->bus,
 165                                         devc->usb->address, USB_INTERFACE);
 166                         }
 167                 } else {
 168                         sr_err("hantek-dso: failed to open device: %d", err);
 169                 }
 170
 171                 /* if we made it here, we handled the device one way or another */
 172                 break;
 173         }
 174         libusb_free_device_list(devlist, 1);
 175
 176         if (sdi->status != SR_ST_ACTIVE)
 177                 return SR_ERR;
 178
 179         return SR_OK;
 180 }
 181
 182 SR_PRIV void dso_close(struct sr_dev_inst *sdi)
 183 {
 184         struct dev_context *devc;
 185
 186         devc = sdi->priv;
 187
 188         if (devc->usb->devhdl == NULL)
 189                 return;
 190
 191         sr_info("hantek-dso: closing device %d on %d.%d interface %d", sdi->index,
 192                 devc->usb->bus, devc->usb->address, USB_INTERFACE);
 193         libusb_release_interface(devc->usb->devhdl, USB_INTERFACE);
 194         libusb_close(devc->usb->devhdl);
 195         devc->usb->devhdl = NULL;
 196         sdi->status = SR_ST_INACTIVE;
 197
 198 }
 199
 200 static int get_channel_offsets(struct dev_context *devc)
 201 {
 202         GString *gs;
 203         int chan, v, ret;
 204
 205         sr_dbg("hantek-dso: getting channel offsets");
 206
 207         ret = libusb_control_transfer(devc->usb->devhdl,
 208                         LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_VENDOR,
 209                         CTRL_READ_EEPROM, EEPROM_CHANNEL_OFFSETS, 0,
 210                         (unsigned char *)&devc->channel_levels,
 211                         sizeof(devc->channel_levels), 200);
 212         if (ret != sizeof(devc->channel_levels)) {
 213                 sr_err("failed to get channel offsets: %d", ret);
 214                 return SR_ERR;
 215         }
 216
 217         /* Comes in as 16-bit numbers with the second byte always 0 on
 218          * the DSO-2090. Guessing this is supposed to be big-endian,
 219          * since that's how voltage offsets are submitted back to the DSO.
 220          * Convert to host order now, so we can use them natively.
 221          */
 222         for (chan = 0; chan < 2; chan++) {
 223                 for (v = 0; v < 9; v++) {
 224                         devc->channel_levels[chan][v][0] = g_ntohs(devc->channel_levels[chan][v][0]);
 225                         devc->channel_levels[chan][v][1] = g_ntohs(devc->channel_levels[chan][v][1]);
 226                 }
 227         }
 228
 229         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 230                 gs = g_string_sized_new(128);
 231                 for (chan = 0; chan < 2; chan++) {
 232                         g_string_printf(gs, "hantek-dso: CH%d:", chan + 1);
 233                         for (v = 0; v < 9; v++) {
 234                                 g_string_append_printf(gs, " %.4x-%.4x",
 235                                                 devc->channel_levels[chan][v][0],
 236                                                 devc->channel_levels[chan][v][1]);
 237                         }
 238                         sr_dbg(gs->str);
 239                 }
 240                 g_string_free(gs, TRUE);
 241         }
 242
 243         return SR_OK;
 244 }
 245
 246 SR_PRIV int dso_set_trigger_samplerate(struct dev_context *devc)
 247 {
 248         int ret, tmp;
 249         uint8_t cmdstring[12];
 250         uint16_t timebase_small[] = { 0xffff, 0xfffc, 0xfff7, 0xffe8, 0xffce,
 251                         0xff9c, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79, 0xd8f1 };
 252         uint16_t timebase_large[] = { 0xffff, 0x0000, 0xfffc, 0xfff7, 0xffe8,
 253                         0xffce, 0xff9d, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79 };
 254
 255         sr_dbg("hantek-dso: preparing CMD_SET_TRIGGER_SAMPLERATE");
 256
 257         memset(cmdstring, 0, sizeof(cmdstring));
 258         /* Command */
 259         cmdstring[0] = CMD_SET_TRIGGER_SAMPLERATE;
 260
 261         /* Trigger source */
 262         sr_dbg("hantek-dso: trigger source %s", devc->triggersource);
 263         if (!strcmp("CH2", devc->triggersource))
 264                 tmp = 0;
 265         else if (!strcmp("CH1", devc->triggersource))
 266                 tmp = 1;
 267         else if (!strcmp("EXT", devc->triggersource))
 268                 tmp = 2;
 269         else {
 270                 sr_err("hantek-dso: invalid trigger source %s", devc->triggersource);
 271                 return SR_ERR_ARG;
 272         }
 273         cmdstring[2] = tmp;
 274
 275         /* Frame size */
 276         sr_dbg("hantek-dso: frame size %d", devc->framesize);
 277         cmdstring[2] |= (devc->framesize == FRAMESIZE_SMALL ? 0x01 : 0x02) << 2;
 278
 279         /* Timebase fast */
 280         sr_dbg("hantek-dso: time base index %d", devc->timebase);
 281         switch (devc->framesize) {
 282         case FRAMESIZE_SMALL:
 283                 if (devc->timebase < TIME_20us)
 284                         tmp = 0;
 285                 else if (devc->timebase == TIME_20us)
 286                         tmp = 1;
 287                 else if (devc->timebase == TIME_40us)
 288                         tmp = 2;
 289                 else if (devc->timebase == TIME_100us)
 290                         tmp = 3;
 291                 else if (devc->timebase >= TIME_200us)
 292                         tmp = 4;
 293                 break;
 294         case FRAMESIZE_LARGE:
 295                 if (devc->timebase < TIME_40us) {
 296                         sr_err("hantek-dso: timebase < 40us only supported with 10K buffer");
 297                         return SR_ERR_ARG;
 298                 }
 299                 else if (devc->timebase == TIME_40us)
 300                         tmp = 0;
 301                 else if (devc->timebase == TIME_100us)
 302                         tmp = 2;
 303                 else if (devc->timebase == TIME_200us)
 304                         tmp = 3;
 305                 else if (devc->timebase >= TIME_400us)
 306                         tmp = 4;
 307                 break;
 308         }
 309         cmdstring[2] |= (tmp & 0x07) << 5;
 310
 311         /* Enabled channels: 00=CH1 01=CH2 10=both */
 312         sr_dbg("hantek-dso: channels CH1=%d CH2=%d", devc->ch1_enabled, devc->ch2_enabled);
 313         tmp = (((devc->ch2_enabled ? 1 : 0) << 1) + (devc->ch1_enabled ? 1 : 0)) - 1;
 314         cmdstring[3] = tmp;
 315
 316         /* Fast rates channel */
 317         /* TODO: is this right? */
 318         tmp = devc->timebase < TIME_10us ? 1 : 0;
 319         cmdstring[3] |= tmp << 2;
 320
 321         /* Trigger slope: 0=positive 1=negative */
 322         /* TODO: does this work? */
 323         sr_dbg("hantek-dso: trigger slope %d", devc->triggerslope);
 324         cmdstring[3] |= (devc->triggerslope == SLOPE_NEGATIVE ? 1 : 0) << 3;
 325
 326         /* Timebase slow */
 327         if (devc->timebase < TIME_100us)
 328                 tmp = 0;
 329         else if (devc->timebase > TIME_400ms)
 330                 tmp = 0xffed;
 331         else {
 332                 if (devc->framesize == FRAMESIZE_SMALL)
 333                         tmp = timebase_small[devc->timebase - 3];
 334                 else
 335                         tmp = timebase_large[devc->timebase - 3];
 336         }
 337         cmdstring[4] = tmp & 0xff;
 338         cmdstring[5] = (tmp >> 8) & 0xff;
 339
 340         /* Horizontal trigger position */
 341         sr_dbg("hantek-dso: trigger position %3.2f", devc->triggerposition);
 342         tmp = 0x77fff + 0x8000 * devc->triggerposition;
 343         cmdstring[6] = tmp & 0xff;
 344         cmdstring[7] = (tmp >> 8) & 0xff;
 345         cmdstring[10] = (tmp >> 16) & 0xff;
 346
 347         if (send_begin(devc) != SR_OK)
 348                 return SR_ERR;
 349
 350         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 351                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 352                         cmdstring, sizeof(cmdstring),
 353                         &tmp, 100)) != 0) {
 354                 sr_err("Failed to set trigger/samplerate: %d", ret);
 355                 return SR_ERR;
 356         }
 357         sr_dbg("hantek-dso: sent CMD_SET_TRIGGER_SAMPLERATE");
 358
 359         return SR_OK;
 360 }
 361
 362 SR_PRIV int dso_set_filters(struct dev_context *devc)
 363 {
 364         int ret, tmp;
 365         uint8_t cmdstring[8];
 366
 367         sr_dbg("hantek-dso: preparing CMD_SET_FILTERS");
 368
 369         memset(cmdstring, 0, sizeof(cmdstring));
 370         cmdstring[0] = CMD_SET_FILTERS;
 371         cmdstring[1] = 0x0f;
 372         if (devc->filter_ch1) {
 373                 sr_dbg("hantek-dso: turning on CH1 filter");
 374                 cmdstring[2] |= 0x80;
 375         }
 376         if (devc->filter_ch2) {
 377                 sr_dbg("hantek-dso: turning on CH2 filter");
 378                 cmdstring[2] |= 0x40;
 379         }
 380         if (devc->filter_trigger) {
 381                 /* TODO: supported on the DSO-2090? */
 382                 sr_dbg("hantek-dso: turning on trigger filter");
 383                 cmdstring[2] |= 0x20;
 384         }
 385
 386         if (send_begin(devc) != SR_OK)
 387                 return SR_ERR;
 388
 389         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 390                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 391                         cmdstring, sizeof(cmdstring),
 392                         &tmp, 100)) != 0) {
 393                 sr_err("Failed to set filters: %d", ret);
 394                 return SR_ERR;
 395         }
 396         sr_dbg("hantek-dso: sent CMD_SET_FILTERS");
 397
 398         return SR_OK;
 399 }
 400
 401 SR_PRIV int dso_set_voltage(struct dev_context *devc)
 402 {
 403         int ret, tmp;
 404         uint8_t cmdstring[8];
 405
 406         sr_dbg("hantek-dso: preparing CMD_SET_VOLTAGE");
 407
 408         memset(cmdstring, 0, sizeof(cmdstring));
 409         cmdstring[0] = CMD_SET_VOLTAGE;
 410         cmdstring[1] = 0x0f;
 411         cmdstring[2] = 0x30;
 412
 413         /* CH1 volts/div is encoded in bits 0-1 */
 414         sr_dbg("hantek-dso: CH1 vdiv index %d", devc->voltage_ch1);
 415         switch (devc->voltage_ch1) {
 416         case VDIV_1V:
 417         case VDIV_100MV:
 418         case VDIV_10MV:
 419                 cmdstring[2] |= 0x00;
 420                 break;
 421         case VDIV_2V:
 422         case VDIV_200MV:
 423         case VDIV_20MV:
 424                 cmdstring[2] |= 0x01;
 425                 break;
 426         case VDIV_5V:
 427         case VDIV_500MV:
 428         case VDIV_50MV:
 429                 cmdstring[2] |= 0x02;
 430                 break;
 431         }
 432
 433         /* CH2 volts/div is encoded in bits 2-3 */
 434         sr_dbg("hantek-dso: CH2 vdiv index %d", devc->voltage_ch2);
 435         switch (devc->voltage_ch2) {
 436         case VDIV_1V:
 437         case VDIV_100MV:
 438         case VDIV_10MV:
 439                 cmdstring[2] |= 0x00;
 440                 break;
 441         case VDIV_2V:
 442         case VDIV_200MV:
 443         case VDIV_20MV:
 444                 cmdstring[2] |= 0x04;
 445                 break;
 446         case VDIV_5V:
 447         case VDIV_500MV:
 448         case VDIV_50MV:
 449                 cmdstring[2] |= 0x08;
 450                 break;
 451         }
 452
 453         if (send_begin(devc) != SR_OK)
 454                 return SR_ERR;
 455
 456         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 457                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 458                         cmdstring, sizeof(cmdstring),
 459                         &tmp, 100)) != 0) {
 460                 sr_err("Failed to set voltage: %d", ret);
 461                 return SR_ERR;
 462         }
 463         sr_dbg("hantek-dso: sent CMD_SET_VOLTAGE");
 464
 465         return SR_OK;
 466 }
 467
 468 SR_PRIV int dso_set_relays(struct dev_context *devc)
 469 {
 470         GString *gs;
 471         int ret, i;
 472         uint8_t relays[17] = { 0x00, 0x04, 0x08, 0x02, 0x20, 0x40, 0x10, 0x01,
 473                         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 474
 475         sr_dbg("hantek-dso: preparing CTRL_SETRELAYS");
 476
 477         if (devc->voltage_ch1 < VDIV_1V)
 478                 relays[1] = ~relays[1];
 479
 480         if (devc->voltage_ch1 < VDIV_100MV)
 481                 relays[2] = ~relays[2];
 482
 483         sr_dbg("hantek-dso: CH1 coupling %d", devc->coupling_ch1);
 484         if (devc->coupling_ch1 != COUPLING_AC)
 485                 relays[3] = ~relays[3];
 486
 487         if (devc->voltage_ch2 < VDIV_1V)
 488                 relays[4] = ~relays[4];
 489
 490         if (devc->voltage_ch2 < VDIV_100MV)
 491                 relays[5] = ~relays[5];
 492
 493         sr_dbg("hantek-dso: CH2 coupling %d", devc->coupling_ch1);
 494         if (devc->coupling_ch2 != COUPLING_AC)
 495                 relays[6] = ~relays[6];
 496
 497         if (!strcmp(devc->triggersource, "EXT"))
 498                 relays[7] = ~relays[7];
 499
 500         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 501                 gs = g_string_sized_new(128);
 502                 g_string_printf(gs, "hantek-dso: relays:");
 503                 for (i = 0; i < 17; i++)
 504                         g_string_append_printf(gs, " %.2x", relays[i]);
 505                 sr_dbg(gs->str);
 506                 g_string_free(gs, TRUE);
 507         }
 508
 509         if ((ret = libusb_control_transfer(devc->usb->devhdl,
 510                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETRELAYS,
 511                         0, 0, relays, 17, 100)) != sizeof(relays)) {
 512                 sr_err("failed to set relays: %d", ret);
 513                 return SR_ERR;
 514         }
 515         sr_dbg("hantek-dso: sent CTRL_SETRELAYS");
 516
 517         return SR_OK;
 518 }
 519
 520 SR_PRIV int dso_set_voffsets(struct dev_context *devc)
 521 {
 522         int offset, ret;
 523         uint16_t *ch_levels;
 524         uint8_t offsets[17];
 525
 526         sr_dbg("hantek-dso: preparing CTRL_SETOFFSET");
 527
 528         memset(offsets, 0, sizeof(offsets));
 529         /* Channel 1 */
 530         ch_levels = devc->channel_levels[0][devc->voltage_ch1];
 531         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch1 + ch_levels[0];
 532         offsets[0] = (offset >> 8) | 0x20;
 533         offsets[1] = offset & 0xff;
 534         sr_dbg("hantek-dso: CH1 offset %3.2f (%.2x%.2x)", devc->voffset_ch1,
 535                         offsets[0], offsets[1]);
 536
 537         /* Channel 2 */
 538         ch_levels = devc->channel_levels[1][devc->voltage_ch2];
 539         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch2 + ch_levels[0];
 540         offsets[2] = (offset >> 8) | 0x20;
 541         offsets[3] = offset & 0xff;
 542         sr_dbg("hantek-dso: CH2 offset %3.2f (%.2x%.2x)", devc->voffset_ch2,
 543                         offsets[2], offsets[3]);
 544
 545         /* Trigger */
 546         offset = MAX_VERT_TRIGGER * devc->voffset_trigger;
 547         offsets[4] = (offset >> 8) | 0x20;
 548         offsets[5] = offset & 0xff;
 549         sr_dbg("hantek-dso: trigger offset %3.2f (%.2x%.2x)", devc->voffset_trigger,
 550                         offsets[4], offsets[5]);
 551
 552         if ((ret = libusb_control_transfer(devc->usb->devhdl,
 553                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETOFFSET,
 554                         0, 0, offsets, sizeof(offsets), 100)) != sizeof(offsets)) {
 555                 sr_err("failed to set offsets: %d", ret);
 556                 return SR_ERR;
 557         }
 558         sr_dbg("hantek-dso: sent CTRL_SETOFFSET");
 559
 560         return SR_OK;
 561 }
 562
 563 SR_PRIV int dso_enable_trigger(struct dev_context *devc)
 564 {
 565         int ret, tmp;
 566         uint8_t cmdstring[2];
 567
 568         sr_dbg("hantek-dso: sending CMD_ENABLE_TRIGGER");
 569
 570         memset(cmdstring, 0, sizeof(cmdstring));
 571         cmdstring[0] = CMD_ENABLE_TRIGGER;
 572         cmdstring[1] = 0x00;
 573
 574         if (send_begin(devc) != SR_OK)
 575                 return SR_ERR;
 576
 577         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 578                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 579                         cmdstring, sizeof(cmdstring),
 580                         &tmp, 100)) != 0) {
 581                 sr_err("Failed to enable trigger: %d", ret);
 582                 return SR_ERR;
 583         }
 584
 585         return SR_OK;
 586 }
 587
 588 SR_PRIV int dso_force_trigger(struct dev_context *devc)
 589 {
 590         int ret, tmp;
 591         uint8_t cmdstring[2];
 592
 593         sr_dbg("hantek-dso: sending CMD_FORCE_TRIGGER");
 594
 595         memset(cmdstring, 0, sizeof(cmdstring));
 596         cmdstring[0] = CMD_FORCE_TRIGGER;
 597         cmdstring[1] = 0x00;
 598
 599         if (send_begin(devc) != SR_OK)
 600                 return SR_ERR;
 601
 602         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 603                         DSO_EP_OUT | LIBUSB_ENDPOINT_OUT,
 604                         cmdstring, sizeof(cmdstring),
 605                         &tmp, 100)) != 0) {
 606                 sr_err("Failed to force trigger: %d", ret);
 607                 return SR_ERR;
 608         }
 609
 610         return SR_OK;
 611 }
 612
 613 SR_PRIV int dso_init(struct dev_context *devc)
 614 {
 615
 616         sr_dbg("hantek-dso: initializing dso");
 617
 618         if (get_channel_offsets(devc) != SR_OK)
 619                 return SR_ERR;
 620
 621         if (dso_set_trigger_samplerate(devc) != SR_OK)
 622                 return SR_ERR;
 623
 624         if (dso_set_filters(devc) != SR_OK)
 625                 return SR_ERR;
 626
 627         if (dso_set_voltage(devc) != SR_OK)
 628                 return SR_ERR;
 629
 630         if (dso_set_relays(devc) != SR_OK)
 631                 return SR_ERR;
 632
 633         if (dso_set_voffsets(devc) != SR_OK)
 634                 return SR_ERR;
 635
 636         if (dso_enable_trigger(devc) != SR_OK)
 637                 return SR_ERR;
 638
 639         return SR_OK;
 640 }
 641
 642 SR_PRIV int dso_get_capturestate(struct dev_context *devc, uint8_t *capturestate,
 643                 uint32_t *trigger_offset)
 644 {
 645         int ret, tmp, i;
 646         unsigned int bitvalue, toff;
 647         uint8_t cmdstring[2], inbuf[512];
 648
 649         sr_dbg("hantek-dso: sending CMD_GET_CAPTURESTATE");
 650
 651         cmdstring[0] = CMD_GET_CAPTURESTATE;
 652         cmdstring[1] = 0;
 653
 654         if ((ret = send_bulkcmd(devc, cmdstring, sizeof(cmdstring))) != SR_OK) {
 655                 sr_dbg("Failed to send get_capturestate command: %d", ret);
 656                 return SR_ERR;
 657         }
 658
 659         if ((ret = libusb_bulk_transfer(devc->usb->devhdl,
 660                         DSO_EP_IN | LIBUSB_ENDPOINT_IN,
 661                         inbuf, 512, &tmp, 100)) != 0) {
 662                 sr_dbg("Failed to get capturestate: %d", ret);
 663                 return SR_ERR;
 664         }
 665         *capturestate = inbuf[0];
 666         toff = (inbuf[1] << 16) | (inbuf[3] << 8) | inbuf[2];
 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("hantek-dso: 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("hantek-dso: 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 * sizeof(unsigned short) / devc->epin_maxpacketsize;
 721         sr_dbg("hantek-dso: queueing up %d transfers", num_transfers);
 722         for (i = 0; i < num_transfers; i++) {
 723                 if (!(buf = g_try_malloc(devc->epin_maxpacketsize))) {
 724                         sr_err("hantek-dso: %s: buf malloc failed", __func__);
 725                         return SR_ERR_MALLOC;
 726                 }
 727                 transfer = libusb_alloc_transfer(0);
 728                 libusb_fill_bulk_transfer(transfer, devc->usb->devhdl,
 729                                 DSO_EP_IN | LIBUSB_ENDPOINT_IN, buf,
 730                                 devc->epin_maxpacketsize, cb, devc, 40);
 731                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 732                         sr_err("failed to submit transfer: %d", ret);
 733                         /* TODO: Free them all. */
 734                         libusb_free_transfer(transfer);
 735                         g_free(buf);
 736                         return SR_ERR;
 737                 }
 738         }
 739
 740         return SR_OK;
 741 }
 742