src/hardware/hantek-dso/protocol.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
   5  * With protocol information from the hantekdso project,
   6  * Copyright (C) 2008 Oleg Khudyakov <prcoder@gmail.com>
   7  *
   8  * This program is free software: you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation, either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include <config.h>
  23 #include <string.h>
  24 #include <glib.h>
  25 #include <libusb.h>
  26 #include <libsigrok/libsigrok.h>
  27 #include "libsigrok-internal.h"
  28 #include "protocol.h"
  29
  30 static int send_begin(const struct sr_dev_inst *sdi)
  31 {
  32         struct sr_usb_dev_inst *usb;
  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         usb = sdi->conn;
  40         if ((ret = libusb_control_transfer(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: %s.",
  44                        libusb_error_name(ret));
  45                 return SR_ERR;
  46         }
  47
  48         return SR_OK;
  49 }
  50
  51 static int send_bulkcmd(const struct sr_dev_inst *sdi, uint8_t *cmdstring, int cmdlen)
  52 {
  53         struct sr_usb_dev_inst *usb;
  54         int ret, tmp;
  55
  56         usb = sdi->conn;
  57
  58         if (send_begin(sdi) != SR_OK)
  59                 return SR_ERR;
  60
  61         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT, cmdstring,
  62                         cmdlen, &tmp, 200)) != 0)
  63                 return SR_ERR;
  64
  65         return SR_OK;
  66 }
  67
  68 static int dso_getmps(libusb_device *dev)
  69 {
  70         struct libusb_device_descriptor des;
  71         struct libusb_config_descriptor *conf_dsc;
  72         const struct libusb_interface_descriptor *intf_dsc;
  73         int mps;
  74
  75         libusb_get_device_descriptor(dev, &des);
  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         struct dev_context *devc;
 110         struct drv_context *drvc = sdi->driver->context;
 111         struct sr_usb_dev_inst *usb;
 112         struct libusb_device_descriptor des;
 113         libusb_device **devlist;
 114         int err, i;
 115         char connection_id[64];
 116
 117         devc = sdi->priv;
 118         usb = sdi->conn;
 119
 120         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 121         for (i = 0; devlist[i]; i++) {
 122                 libusb_get_device_descriptor(devlist[i], &des);
 123
 124                 if (des.idVendor != devc->profile->fw_vid
 125                     || des.idProduct != devc->profile->fw_pid)
 126                         continue;
 127
 128                 if ((sdi->status == SR_ST_INITIALIZING) ||
 129                                 (sdi->status == SR_ST_INACTIVE)) {
 130                         /*
 131                          * Check device by its physical USB bus/port address.
 132                          */
 133                         usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 134                         if (strcmp(sdi->connection_id, connection_id))
 135                                 /* This is not the one. */
 136                                 continue;
 137                 }
 138
 139                 if (!(err = libusb_open(devlist[i], &usb->devhdl))) {
 140                         if (usb->address == 0xff)
 141                                 /*
 142                                  * first time we touch this device after firmware upload,
 143                                  * so we don't know the address yet.
 144                                  */
 145                                 usb->address = libusb_get_device_address(devlist[i]);
 146
 147                         if (!(devc->epin_maxpacketsize = dso_getmps(devlist[i])))
 148                                 sr_err("Wrong endpoint profile.");
 149                         else {
 150                                 sdi->status = SR_ST_ACTIVE;
 151                                 sr_info("Opened device on %d.%d (logical) / "
 152                                                 "%s (physical) interface %d.",
 153                                         usb->bus, usb->address,
 154                                         sdi->connection_id, USB_INTERFACE);
 155                         }
 156                 } else {
 157                         sr_err("Failed to open device: %s.",
 158                                libusb_error_name(err));
 159                 }
 160
 161                 /* If we made it here, we handled the device (somehow). */
 162                 break;
 163         }
 164         libusb_free_device_list(devlist, 1);
 165
 166         if (sdi->status != SR_ST_ACTIVE)
 167                 return SR_ERR;
 168
 169         return SR_OK;
 170 }
 171
 172 SR_PRIV void dso_close(struct sr_dev_inst *sdi)
 173 {
 174         struct sr_usb_dev_inst *usb;
 175
 176         usb = sdi->conn;
 177
 178         if (!usb->devhdl)
 179                 return;
 180
 181         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 182                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 183         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 184         libusb_close(usb->devhdl);
 185         usb->devhdl = NULL;
 186         sdi->status = SR_ST_INACTIVE;
 187
 188 }
 189
 190 static int get_channel_offsets(const struct sr_dev_inst *sdi)
 191 {
 192         struct dev_context *devc;
 193         struct sr_usb_dev_inst *usb;
 194         GString *gs;
 195         int chan, v, ret;
 196
 197         sr_dbg("Getting channel offsets.");
 198
 199         devc = sdi->priv;
 200         usb = sdi->conn;
 201
 202         ret = libusb_control_transfer(usb->devhdl,
 203                         LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_VENDOR,
 204                         CTRL_READ_EEPROM, EEPROM_CHANNEL_OFFSETS, 0,
 205                         (unsigned char *)&devc->channel_levels,
 206                         sizeof(devc->channel_levels), 200);
 207         if (ret != sizeof(devc->channel_levels)) {
 208                 sr_err("Failed to get channel offsets: %s.",
 209                        libusb_error_name(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 < NUM_CHANNELS; 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 < NUM_CHANNELS; 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("%s", gs->str);
 237                 }
 238                 g_string_free(gs, TRUE);
 239         }
 240
 241         return SR_OK;
 242 }
 243
 244 /* See http://openhantek.sourceforge.net/doc/namespaceHantek.html#ac1cd181814cf3da74771c29800b39028 */
 245 static int dso2250_set_trigger_samplerate(const struct sr_dev_inst *sdi)
 246 {
 247         struct dev_context *devc;
 248         struct sr_usb_dev_inst *usb;
 249         int ret, tmp;
 250         int base;
 251         uint8_t cmdstring[12];
 252
 253
 254         devc = sdi->priv;
 255         usb = sdi->conn;
 256
 257         memset(cmdstring, 0, sizeof(cmdstring));
 258         /* Command */
 259         cmdstring[0] = CMD_2250_SET_TRIGGERSOURCE;
 260         sr_dbg("Trigger source %s.", devc->triggersource);
 261         if (!strcmp("CH2", devc->triggersource))
 262                 tmp = 3;
 263         else if (!strcmp("CH1", devc->triggersource))
 264                 tmp = 2;
 265         else if (!strcmp("EXT", devc->triggersource))
 266                 tmp = 0;
 267         else {
 268                 sr_err("Invalid trigger source: '%s'.", devc->triggersource);
 269                 return SR_ERR_ARG;
 270         }
 271         cmdstring[2] = tmp;
 272
 273
 274         sr_dbg("Trigger slope: %d.", devc->triggerslope);
 275         cmdstring[2] |= (devc->triggerslope == SLOPE_NEGATIVE ? 1 : 0) << 3;
 276
 277         if (send_begin(sdi) != SR_OK)
 278                 return SR_ERR;
 279
 280         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 281                         cmdstring, 8, &tmp, 100)) != 0) {
 282                 sr_err("Failed to set trigger/samplerate: %s.",
 283                        libusb_error_name(ret));
 284                 return SR_ERR;
 285         }
 286
 287
 288         /* Frame size */
 289         sr_dbg("Frame size: %d.", devc->framesize);
 290         cmdstring[0] = CMD_2250_SET_RECORD_LENGTH;
 291         cmdstring[2] = devc->framesize == FRAMESIZE_SMALL ? 0x01 : 0x02;
 292
 293         if (send_begin(sdi) != SR_OK)
 294                 return SR_ERR;
 295
 296         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 297                         cmdstring, 4, &tmp, 100)) != 0) {
 298                 sr_err("Failed to set record length: %s.",
 299                        libusb_error_name(ret));
 300                 return SR_ERR;
 301         }
 302
 303
 304         memset(cmdstring, 0, sizeof(cmdstring));
 305         cmdstring[0] = CMD_2250_SET_SAMPLERATE;
 306         sr_dbg("Sample rate: %u", devc->samplerate);
 307         base = 100e6;
 308         if (devc->samplerate > base) {
 309                 /* Timebase fast */
 310                 sr_err("Sample rate > 100MHz not yet supported.");
 311                 return SR_ERR_ARG;
 312         }
 313
 314         tmp = base / devc->samplerate;
 315         sr_dbg("sample rate value: %d.", devc->samplerate);
 316         if (tmp) {
 317                 /* Downsampling on */
 318                 cmdstring[2] |= 2;
 319                 /* Downsampler = 1comp((Base / Samplerate) - 2)
 320                  *  Base == 100Msa resp. 200MSa
 321                  *
 322                  * Example for 500kSa/s:
 323                  *  100e6 / 500e3 => 200
 324                  *  200 - 2 => 198
 325                  *  1comp(198) => ff39 */
 326                 tmp -= 2;
 327                 tmp = ~tmp;
 328                 sr_dbg("down sampler value: 0x%x.", tmp & 0xffff);
 329                 cmdstring[4] = (tmp >> 0) & 0xff;
 330                 cmdstring[5] = (tmp >> 8) & 0xff;
 331         }
 332
 333         if (send_begin(sdi) != SR_OK)
 334                 return SR_ERR;
 335
 336         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 337                         cmdstring, 8, &tmp, 100)) != 0) {
 338                 sr_err("Failed to set sample rate: %s.",
 339                        libusb_error_name(ret));
 340                 return SR_ERR;
 341         }
 342         sr_dbg("Sent CMD_2250_SET_SAMPLERATE.");
 343
 344
 345         /* Enabled channels: 00=CH1 01=CH2 10=both */
 346         memset(cmdstring, 0, sizeof(cmdstring));
 347         cmdstring[0] = CMD_2250_SET_CHANNELS;
 348         sr_dbg("Channels CH1=%d CH2=%d", devc->ch_enabled[0], devc->ch_enabled[1]);
 349         cmdstring[2] = (devc->ch_enabled[0] ? 0 : 1) + (devc->ch_enabled[1] ? 2 : 0);
 350
 351         if (send_begin(sdi) != SR_OK)
 352                 return SR_ERR;
 353
 354         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 355                         cmdstring, 4, &tmp, 100)) != 0) {
 356                 sr_err("Failed to set channels: %s.",
 357                        libusb_error_name(ret));
 358                 return SR_ERR;
 359         }
 360         sr_dbg("Sent CMD_2250_SET_CHANNELS.");
 361
 362
 363
 364         /* Trigger slope: 0=positive 1=negative */
 365         memset(cmdstring, 0, sizeof(cmdstring));
 366         cmdstring[0] = CMD_2250_SET_TRIGGERPOS_AND_BUFFER;
 367
 368         /* TODO for big buffer */
 369         sr_dbg("Trigger position: %3.2f.", devc->triggerposition);
 370 //      tmp = 0x77fff + 0x8000 * devc->triggerposition;
 371 //      cmdstring[6] = tmp & 0xff;
 372 //      cmdstring[7] = (tmp >> 8) & 0xff;
 373 //      cmdstring[10] = (tmp >> 16) & 0xff;
 374
 375         cmdstring[2]=0xff;
 376         cmdstring[3]=0xff;
 377         cmdstring[4]=0x07;
 378
 379         cmdstring[6]=0xff;
 380         cmdstring[7]=0xd7;
 381         cmdstring[8]=0x07;
 382
 383         if (send_begin(sdi) != SR_OK)
 384                 return SR_ERR;
 385
 386         /* TODO: 12 bytes according to documentation? */
 387         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 388                         cmdstring, 10, &tmp, 100)) != 0) {
 389                 sr_err("Failed to set trigger position: %s.",
 390                        libusb_error_name(ret));
 391                 return SR_ERR;
 392         }
 393
 394         return SR_OK;
 395 }
 396
 397 int dso_set_trigger_samplerate(const struct sr_dev_inst *sdi)
 398 {
 399         struct dev_context *devc;
 400         struct sr_usb_dev_inst *usb;
 401         int ret, tmp;
 402         uint8_t cmdstring[12];
 403         uint16_t timebase_small[] = { 0xffff, 0xfffc, 0xfff7, 0xffe8, 0xffce,
 404                 0xff9c, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79, 0xd8f1 };
 405         uint16_t timebase_large[] = { 0xffff, 0x0000, 0xfffc, 0xfff7, 0xffe8,
 406                 0xffce, 0xff9d, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79 };
 407
 408         devc = sdi->priv;
 409         if (devc->profile->fw_pid == 0x2250)
 410                 return dso2250_set_trigger_samplerate(sdi);
 411
 412         sr_dbg("Preparing CMD_SET_TRIGGER_SAMPLERATE.");
 413
 414         usb = sdi->conn;
 415
 416         memset(cmdstring, 0, sizeof(cmdstring));
 417         /* Command */
 418         cmdstring[0] = CMD_SET_TRIGGER_SAMPLERATE;
 419
 420         /* Trigger source */
 421         sr_dbg("Trigger source %s.", devc->triggersource);
 422         if (!strcmp("CH2", devc->triggersource))
 423                 tmp = 0;
 424         else if (!strcmp("CH1", devc->triggersource))
 425                 tmp = 1;
 426         else if (!strcmp("EXT", devc->triggersource))
 427                 tmp = 2;
 428         else {
 429                 sr_err("Invalid trigger source: '%s'.", devc->triggersource);
 430                 return SR_ERR_ARG;
 431         }
 432         cmdstring[2] = tmp;
 433
 434         /* Frame size */
 435         sr_dbg("Frame size: %d.", devc->framesize);
 436         cmdstring[2] |= (devc->framesize == FRAMESIZE_SMALL ? 0x01 : 0x02) << 2;
 437
 438         /* Timebase fast */
 439         sr_dbg("Time base index: %d.", devc->timebase);
 440         if (devc->framesize == FRAMESIZE_SMALL) {
 441                 if (devc->timebase < TIME_20us)
 442                         tmp = 0;
 443                 else if (devc->timebase == TIME_20us)
 444                         tmp = 1;
 445                 else if (devc->timebase == TIME_40us)
 446                         tmp = 2;
 447                 else if (devc->timebase == TIME_100us)
 448                         tmp = 3;
 449                 else if (devc->timebase >= TIME_200us)
 450                         tmp = 4;
 451         } else {
 452                 if (devc->timebase < TIME_40us) {
 453                         sr_err("Timebase < 40us only supported with 10K buffer.");
 454                         return SR_ERR_ARG;
 455                 }
 456                 else if (devc->timebase == TIME_40us)
 457                         tmp = 0;
 458                 else if (devc->timebase == TIME_100us)
 459                         tmp = 2;
 460                 else if (devc->timebase == TIME_200us)
 461                         tmp = 3;
 462                 else if (devc->timebase >= TIME_400us)
 463                         tmp = 4;
 464         }
 465         cmdstring[2] |= (tmp & 0x07) << 5;
 466
 467         /* Enabled channels: 00=CH1 01=CH2 10=both */
 468         sr_dbg("Channels CH1=%d CH2=%d", devc->ch_enabled[0], devc->ch_enabled[1]);
 469         tmp = (((devc->ch_enabled[1] ? 1 : 0) << 1) + (devc->ch_enabled[0] ? 1 : 0)) - 1;
 470         cmdstring[3] = tmp;
 471
 472         /* Fast rates channel */
 473         /* TODO: Is this right? */
 474         tmp = devc->timebase < TIME_10us ? 1 : 0;
 475         cmdstring[3] |= tmp << 2;
 476
 477         /* Trigger slope: 0=positive 1=negative */
 478         /* TODO: Does this work? */
 479         sr_dbg("Trigger slope: %d.", devc->triggerslope);
 480         cmdstring[3] |= (devc->triggerslope == SLOPE_NEGATIVE ? 1 : 0) << 3;
 481
 482         /* Timebase slow */
 483         if (devc->timebase < TIME_100us)
 484                 tmp = 0;
 485         else if (devc->timebase > TIME_400ms)
 486                 tmp = 0xffed;
 487         else {
 488                 if (devc->framesize == FRAMESIZE_SMALL)
 489                         tmp = timebase_small[devc->timebase - 3];
 490                 else
 491                         tmp = timebase_large[devc->timebase - 3];
 492         }
 493         cmdstring[4] = tmp & 0xff;
 494         cmdstring[5] = (tmp >> 8) & 0xff;
 495
 496         /* Horizontal trigger position */
 497         sr_dbg("Trigger position: %3.2f.", devc->triggerposition);
 498         tmp = 0x77fff + 0x8000 * devc->triggerposition;
 499         cmdstring[6] = tmp & 0xff;
 500         cmdstring[7] = (tmp >> 8) & 0xff;
 501         cmdstring[10] = (tmp >> 16) & 0xff;
 502
 503         if (send_begin(sdi) != SR_OK)
 504                 return SR_ERR;
 505
 506         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 507                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 508                 sr_err("Failed to set trigger/samplerate: %s.",
 509                        libusb_error_name(ret));
 510                 return SR_ERR;
 511         }
 512         sr_dbg("Sent CMD_SET_TRIGGER_SAMPLERATE.");
 513
 514         return SR_OK;
 515 }
 516
 517
 518 static int dso_set_filters(const struct sr_dev_inst *sdi)
 519 {
 520         struct dev_context *devc;
 521         struct sr_usb_dev_inst *usb;
 522         int ret, tmp;
 523         uint8_t cmdstring[8];
 524
 525         sr_dbg("Preparing CMD_SET_FILTERS.");
 526
 527         devc = sdi->priv;
 528         usb = sdi->conn;
 529
 530         memset(cmdstring, 0, sizeof(cmdstring));
 531         cmdstring[0] = CMD_SET_FILTERS;
 532         cmdstring[1] = 0x0f;
 533         if (devc->filter[0]) {
 534                 sr_dbg("Turning on CH1 filter.");
 535                 cmdstring[2] |= 0x80;
 536         }
 537         if (devc->filter[1]) {
 538                 sr_dbg("Turning on CH2 filter.");
 539                 cmdstring[2] |= 0x40;
 540         }
 541         /*
 542          * Not supported: filtering on the trigger
 543          * cmdstring[2] |= 0x20;
 544          */
 545
 546         if (send_begin(sdi) != SR_OK)
 547                 return SR_ERR;
 548
 549         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 550                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 551                 sr_err("Failed to set filters: %s.", libusb_error_name(ret));
 552                 return SR_ERR;
 553         }
 554         sr_dbg("Sent CMD_SET_FILTERS.");
 555
 556         return SR_OK;
 557 }
 558
 559 static int dso_set_voltage(const struct sr_dev_inst *sdi)
 560 {
 561         struct dev_context *devc;
 562         struct sr_usb_dev_inst *usb;
 563         int ret, tmp;
 564         uint8_t cmdstring[8];
 565
 566         sr_dbg("Preparing CMD_SET_VOLTAGE.");
 567
 568         devc = sdi->priv;
 569         usb = sdi->conn;
 570
 571         memset(cmdstring, 0, sizeof(cmdstring));
 572         cmdstring[0] = CMD_SET_VOLTAGE;
 573
 574         if (devc->profile->fw_pid == 0x2250) {
 575                 cmdstring[2] = 0x08;
 576         } else {
 577                 cmdstring[1] = 0x0f;
 578                 cmdstring[2] = 0x30;
 579         }
 580
 581         /* CH1 volts/div is encoded in bits 0-1 */
 582         sr_dbg("CH1 vdiv index: %d.", devc->voltage[0]);
 583         switch (devc->voltage[0]) {
 584         case VDIV_1V:
 585         case VDIV_100MV:
 586         case VDIV_10MV:
 587                 cmdstring[2] |= 0x00;
 588                 break;
 589         case VDIV_2V:
 590         case VDIV_200MV:
 591         case VDIV_20MV:
 592                 cmdstring[2] |= 0x01;
 593                 break;
 594         case VDIV_5V:
 595         case VDIV_500MV:
 596         case VDIV_50MV:
 597                 cmdstring[2] |= 0x02;
 598                 break;
 599         }
 600
 601         /* CH2 volts/div is encoded in bits 2-3 */
 602         sr_dbg("CH2 vdiv index: %d.", devc->voltage[1]);
 603         switch (devc->voltage[1]) {
 604         case VDIV_1V:
 605         case VDIV_100MV:
 606         case VDIV_10MV:
 607                 cmdstring[2] |= 0x00;
 608                 break;
 609         case VDIV_2V:
 610         case VDIV_200MV:
 611         case VDIV_20MV:
 612                 cmdstring[2] |= 0x04;
 613                 break;
 614         case VDIV_5V:
 615         case VDIV_500MV:
 616         case VDIV_50MV:
 617                 cmdstring[2] |= 0x08;
 618                 break;
 619         }
 620
 621         if (send_begin(sdi) != SR_OK)
 622                 return SR_ERR;
 623
 624         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 625                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 626                 sr_err("Failed to set voltage: %s.", libusb_error_name(ret));
 627                 return SR_ERR;
 628         }
 629         sr_dbg("Sent CMD_SET_VOLTAGE.");
 630
 631         return SR_OK;
 632 }
 633
 634 static int dso_set_relays(const struct sr_dev_inst *sdi)
 635 {
 636         struct dev_context *devc;
 637         struct sr_usb_dev_inst *usb;
 638         GString *gs;
 639         int ret, i;
 640         uint8_t relays[17] = { 0x00, 0x04, 0x08, 0x02, 0x20, 0x40, 0x10, 0x01,
 641                         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 642
 643         sr_dbg("Preparing CTRL_SETRELAYS.");
 644
 645         devc = sdi->priv;
 646         usb = sdi->conn;
 647
 648         if (devc->voltage[0] < VDIV_1V)
 649                 relays[1] = ~relays[1];
 650
 651         if (devc->voltage[0] < VDIV_100MV)
 652                 relays[2] = ~relays[2];
 653
 654         sr_dbg("CH1 coupling: %d.", devc->coupling[0]);
 655         if (devc->coupling[0] != COUPLING_AC)
 656                 relays[3] = ~relays[3];
 657
 658         if (devc->voltage[1] < VDIV_1V)
 659                 relays[4] = ~relays[4];
 660
 661         if (devc->voltage[1] < VDIV_100MV)
 662                 relays[5] = ~relays[5];
 663
 664         sr_dbg("CH2 coupling: %d.", devc->coupling[1]);
 665         if (devc->coupling[1] != COUPLING_AC)
 666                 relays[6] = ~relays[6];
 667
 668         if (!strcmp(devc->triggersource, "EXT"))
 669                 relays[7] = ~relays[7];
 670
 671         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 672                 gs = g_string_sized_new(128);
 673                 g_string_printf(gs, "Relays:");
 674                 for (i = 0; i < 17; i++)
 675                         g_string_append_printf(gs, " %.2x", relays[i]);
 676                 sr_dbg("%s", gs->str);
 677                 g_string_free(gs, TRUE);
 678         }
 679
 680         if ((ret = libusb_control_transfer(usb->devhdl,
 681                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETRELAYS,
 682                         0, 0, relays, 17, 100)) != sizeof(relays)) {
 683                 sr_err("Failed to set relays: %s.", libusb_error_name(ret));
 684                 return SR_ERR;
 685         }
 686         sr_dbg("Sent CTRL_SETRELAYS.");
 687
 688         return SR_OK;
 689 }
 690
 691 static int dso_set_voffsets(const struct sr_dev_inst *sdi)
 692 {
 693         struct dev_context *devc;
 694         struct sr_usb_dev_inst *usb;
 695         int offset, ret;
 696         uint16_t *ch_levels;
 697         uint8_t offsets[17];
 698
 699         sr_dbg("Preparing CTRL_SETOFFSET.");
 700
 701         devc = sdi->priv;
 702         usb = sdi->conn;
 703
 704         memset(offsets, 0, sizeof(offsets));
 705         /* Channel 1 */
 706         ch_levels = devc->channel_levels[0][devc->voltage[0]];
 707         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch1 + ch_levels[0];
 708         offsets[0] = (offset >> 8) | 0x20;
 709         offsets[1] = offset & 0xff;
 710         sr_dbg("CH1 offset: %3.2f (%.2x%.2x).", devc->voffset_ch1,
 711                offsets[0], offsets[1]);
 712
 713         /* Channel 2 */
 714         ch_levels = devc->channel_levels[1][devc->voltage[1]];
 715         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch2 + ch_levels[0];
 716         offsets[2] = (offset >> 8) | 0x20;
 717         offsets[3] = offset & 0xff;
 718         sr_dbg("CH2 offset: %3.2f (%.2x%.2x).", devc->voffset_ch2,
 719                offsets[2], offsets[3]);
 720
 721         /* Trigger */
 722         offset = MAX_VERT_TRIGGER * devc->voffset_trigger;
 723         offsets[4] = (offset >> 8) | 0x20;
 724         offsets[5] = offset & 0xff;
 725         sr_dbg("Trigger offset: %3.2f (%.2x%.2x).", devc->voffset_trigger,
 726                         offsets[4], offsets[5]);
 727
 728         if ((ret = libusb_control_transfer(usb->devhdl,
 729                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETOFFSET,
 730                         0, 0, offsets, sizeof(offsets), 100)) != sizeof(offsets)) {
 731                 sr_err("Failed to set offsets: %s.", libusb_error_name(ret));
 732                 return SR_ERR;
 733         }
 734         sr_dbg("Sent CTRL_SETOFFSET.");
 735
 736         return SR_OK;
 737 }
 738
 739 SR_PRIV int dso_enable_trigger(const struct sr_dev_inst *sdi)
 740 {
 741         struct sr_usb_dev_inst *usb;
 742         int ret, tmp;
 743         uint8_t cmdstring[2];
 744
 745         sr_dbg("Sending CMD_ENABLE_TRIGGER.");
 746
 747         usb = sdi->conn;
 748
 749         memset(cmdstring, 0, sizeof(cmdstring));
 750         cmdstring[0] = CMD_ENABLE_TRIGGER;
 751         cmdstring[1] = 0x00;
 752
 753         if (send_begin(sdi) != SR_OK)
 754                 return SR_ERR;
 755
 756         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 757                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 758                 sr_err("Failed to enable trigger: %s.", libusb_error_name(ret));
 759                 return SR_ERR;
 760         }
 761
 762         return SR_OK;
 763 }
 764
 765 SR_PRIV int dso_force_trigger(const struct sr_dev_inst *sdi)
 766 {
 767         struct sr_usb_dev_inst *usb;
 768         int ret, tmp;
 769         uint8_t cmdstring[2];
 770
 771         sr_dbg("Sending CMD_FORCE_TRIGGER.");
 772
 773         usb = sdi->conn;
 774
 775         memset(cmdstring, 0, sizeof(cmdstring));
 776         cmdstring[0] = CMD_FORCE_TRIGGER;
 777         cmdstring[1] = 0x00;
 778
 779         if (send_begin(sdi) != SR_OK)
 780                 return SR_ERR;
 781
 782         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 783                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 784                 sr_err("Failed to force trigger: %s.", libusb_error_name(ret));
 785                 return SR_ERR;
 786         }
 787
 788         return SR_OK;
 789 }
 790
 791 SR_PRIV int dso_init(const struct sr_dev_inst *sdi)
 792 {
 793
 794         sr_dbg("Initializing DSO.");
 795
 796         if (get_channel_offsets(sdi) != SR_OK)
 797                 return SR_ERR;
 798
 799         if (dso_set_trigger_samplerate(sdi) != SR_OK)
 800                 return SR_ERR;
 801
 802         if (dso_set_filters(sdi) != SR_OK)
 803                 return SR_ERR;
 804
 805         if (dso_set_voltage(sdi) != SR_OK)
 806                 return SR_ERR;
 807
 808         if (dso_set_relays(sdi) != SR_OK)
 809                 return SR_ERR;
 810
 811         if (dso_set_voffsets(sdi) != SR_OK)
 812                 return SR_ERR;
 813
 814         if (dso_enable_trigger(sdi) != SR_OK)
 815                 return SR_ERR;
 816
 817         return SR_OK;
 818 }
 819
 820 SR_PRIV int dso_get_capturestate(const struct sr_dev_inst *sdi,
 821                 uint8_t *capturestate, uint32_t *trigger_offset)
 822 {
 823         struct sr_usb_dev_inst *usb;
 824         int ret, tmp, i;
 825         unsigned int bitvalue, toff;
 826         uint8_t cmdstring[2], inbuf[512];
 827
 828         sr_dbg("Sending CMD_GET_CAPTURESTATE.");
 829
 830         usb = sdi->conn;
 831
 832         cmdstring[0] = CMD_GET_CAPTURESTATE;
 833         cmdstring[1] = 0;
 834
 835         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 836                 sr_dbg("Failed to send get_capturestate command: %s.",
 837                        libusb_error_name(ret));
 838                 return SR_ERR;
 839         }
 840
 841         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_IN,
 842                         inbuf, 512, &tmp, 100)) != 0) {
 843                 sr_dbg("Failed to get capturestate: %s.",
 844                        libusb_error_name(ret));
 845                 return SR_ERR;
 846         }
 847         *capturestate = inbuf[0];
 848         toff = (inbuf[1] << 16) | (inbuf[3] << 8) | inbuf[2];
 849
 850         /*
 851          * This conversion comes from the openhantek project.
 852          * Each set bit in the 24-bit value inverts all bits with a lower
 853          * value. No idea why the device reports the trigger point this way.
 854          */
 855         bitvalue = 1;
 856         for (i = 0; i < 24; i++) {
 857                 /* Each set bit inverts all bits with a lower value. */
 858                 if (toff & bitvalue)
 859                         toff ^= bitvalue - 1;
 860                 bitvalue <<= 1;
 861         }
 862         *trigger_offset = toff;
 863
 864         return SR_OK;
 865 }
 866
 867 SR_PRIV int dso_capture_start(const struct sr_dev_inst *sdi)
 868 {
 869         int ret;
 870         uint8_t cmdstring[2];
 871
 872         sr_dbg("Sending CMD_CAPTURE_START.");
 873
 874         cmdstring[0] = CMD_CAPTURE_START;
 875         cmdstring[1] = 0;
 876
 877         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 878                 sr_err("Failed to send capture_start command: %s.",
 879                        libusb_error_name(ret));
 880                 return SR_ERR;
 881         }
 882
 883         return SR_OK;
 884 }
 885
 886 SR_PRIV int dso_get_channeldata(const struct sr_dev_inst *sdi,
 887                 libusb_transfer_cb_fn cb)
 888 {
 889         struct dev_context *devc;
 890         struct sr_usb_dev_inst *usb;
 891         struct libusb_transfer *transfer;
 892         int num_transfers, ret, i;
 893         uint8_t cmdstring[2];
 894         unsigned char *buf;
 895
 896         sr_dbg("Sending CMD_GET_CHANNELDATA.");
 897
 898         devc = sdi->priv;
 899         usb = sdi->conn;
 900
 901         cmdstring[0] = CMD_GET_CHANNELDATA;
 902         cmdstring[1] = 0;
 903
 904         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 905                 sr_err("Failed to get channel data: %s.",
 906                        libusb_error_name(ret));
 907                 return SR_ERR;
 908         }
 909
 910         /* TODO: DSO-2xxx only. */
 911         num_transfers = devc->framesize *
 912                         sizeof(unsigned short) / devc->epin_maxpacketsize;
 913         sr_dbg("Queueing up %d transfers.", num_transfers);
 914         for (i = 0; i < num_transfers; i++) {
 915                 if (!(buf = g_try_malloc(devc->epin_maxpacketsize))) {
 916                         sr_err("Failed to malloc USB endpoint buffer.");
 917                         return SR_ERR_MALLOC;
 918                 }
 919                 transfer = libusb_alloc_transfer(0);
 920                 libusb_fill_bulk_transfer(transfer, usb->devhdl, DSO_EP_IN, buf,
 921                                 devc->epin_maxpacketsize, cb, (void *)sdi, 40);
 922                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 923                         sr_err("Failed to submit transfer: %s.",
 924                                libusb_error_name(ret));
 925                         /* TODO: Free them all. */
 926                         libusb_free_transfer(transfer);
 927                         g_free(buf);
 928                         return SR_ERR;
 929                 }
 930         }
 931
 932         return SR_OK;
 933 }