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                         if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
 134                                 continue;
 135
 136                         if (strcmp(sdi->connection_id, connection_id))
 137                                 /* This is not the one. */
 138                                 continue;
 139                 }
 140
 141                 if (!(err = libusb_open(devlist[i], &usb->devhdl))) {
 142                         if (usb->address == 0xff)
 143                                 /*
 144                                  * first time we touch this device after firmware upload,
 145                                  * so we don't know the address yet.
 146                                  */
 147                                 usb->address = libusb_get_device_address(devlist[i]);
 148
 149                         if (!(devc->epin_maxpacketsize = dso_getmps(devlist[i])))
 150                                 sr_err("Wrong endpoint profile.");
 151                         else {
 152                                 sdi->status = SR_ST_ACTIVE;
 153                                 sr_info("Opened device on %d.%d (logical) / "
 154                                                 "%s (physical) interface %d.",
 155                                         usb->bus, usb->address,
 156                                         sdi->connection_id, USB_INTERFACE);
 157                         }
 158                 } else {
 159                         sr_err("Failed to open device: %s.",
 160                                libusb_error_name(err));
 161                 }
 162
 163                 /* If we made it here, we handled the device (somehow). */
 164                 break;
 165         }
 166         libusb_free_device_list(devlist, 1);
 167
 168         if (sdi->status != SR_ST_ACTIVE)
 169                 return SR_ERR;
 170
 171         return SR_OK;
 172 }
 173
 174 SR_PRIV void dso_close(struct sr_dev_inst *sdi)
 175 {
 176         struct sr_usb_dev_inst *usb;
 177
 178         usb = sdi->conn;
 179
 180         if (!usb->devhdl)
 181                 return;
 182
 183         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 184                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 185         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 186         libusb_close(usb->devhdl);
 187         usb->devhdl = NULL;
 188         sdi->status = SR_ST_INACTIVE;
 189 }
 190
 191 static int get_channel_offsets(const struct sr_dev_inst *sdi)
 192 {
 193         struct dev_context *devc;
 194         struct sr_usb_dev_inst *usb;
 195         GString *gs;
 196         int chan, v, ret;
 197
 198         sr_dbg("Getting channel offsets.");
 199
 200         devc = sdi->priv;
 201         usb = sdi->conn;
 202
 203         ret = libusb_control_transfer(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: %s.",
 210                        libusb_error_name(ret));
 211                 return SR_ERR;
 212         }
 213
 214         /* Comes in as 16-bit numbers with the second byte always 0 on
 215          * the DSO-2090. Guessing this is supposed to be big-endian,
 216          * since that's how voltage offsets are submitted back to the DSO.
 217          * Convert to host order now, so we can use them natively.
 218          */
 219         for (chan = 0; chan < NUM_CHANNELS; chan++) {
 220                 for (v = 0; v < 9; v++) {
 221                         devc->channel_levels[chan][v][0] =
 222                                 g_ntohs(devc->channel_levels[chan][v][0]);
 223                         devc->channel_levels[chan][v][1] =
 224                                 g_ntohs(devc->channel_levels[chan][v][1]);
 225                 }
 226         }
 227
 228         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 229                 gs = g_string_sized_new(128);
 230                 for (chan = 0; chan < NUM_CHANNELS; chan++) {
 231                         g_string_printf(gs, "CH%d:", chan + 1);
 232                         for (v = 0; v < 9; v++) {
 233                                 g_string_append_printf(gs, " %.4x-%.4x",
 234                                         devc->channel_levels[chan][v][0],
 235                                         devc->channel_levels[chan][v][1]);
 236                         }
 237                         sr_dbg("%s", gs->str);
 238                 }
 239                 g_string_free(gs, TRUE);
 240         }
 241
 242         return SR_OK;
 243 }
 244
 245 static void dso2250_set_triggerpos(int value, int long_buffer, uint8_t dest[], int offset)
 246 {
 247         uint32_t min, max;
 248         uint32_t tmp, diff;
 249
 250         min = long_buffer ? 0 : 0x7d7ff;
 251         max = 0x7ffff;
 252
 253         diff = max - min;
 254         tmp = min + diff * value / 100;
 255         sr_dbg("2250 trigger pos: %3d%% * [0x%x,0x%x] == 0x%x", value, min, max, tmp);
 256
 257         dest[offset + 0] = tmp & 0xff;
 258         dest[offset + 1] = (tmp >> 8) & 0xff;
 259         dest[offset + 2] = (tmp >> 16) & 0x7;
 260 }
 261
 262 /* See http://openhantek.sourceforge.net/doc/namespaceHantek.html#ac1cd181814cf3da74771c29800b39028 */
 263 static int dso2250_set_trigger_samplerate(const struct sr_dev_inst *sdi)
 264 {
 265         struct dev_context *devc;
 266         struct sr_usb_dev_inst *usb;
 267         int ret, tmp;
 268         uint64_t base;
 269         uint8_t cmdstring[12];
 270         int trig;
 271
 272         devc = sdi->priv;
 273         usb = sdi->conn;
 274
 275         memset(cmdstring, 0, sizeof(cmdstring));
 276         /* Command */
 277         cmdstring[0] = CMD_2250_SET_TRIGGERSOURCE;
 278         sr_dbg("Trigger source %s.", devc->triggersource);
 279         if (!strcmp("CH2", devc->triggersource))
 280                 tmp = 3;
 281         else if (!strcmp("CH1", devc->triggersource))
 282                 tmp = 2;
 283         else if (!strcmp("EXT", devc->triggersource))
 284                 tmp = 0;
 285         else {
 286                 sr_err("Invalid trigger source: '%s'.", devc->triggersource);
 287                 return SR_ERR_ARG;
 288         }
 289         cmdstring[2] = tmp;
 290
 291         sr_dbg("Trigger slope: %d.", devc->triggerslope);
 292         cmdstring[2] |= (devc->triggerslope == SLOPE_NEGATIVE ? 1 : 0) << 3;
 293
 294         if (send_begin(sdi) != SR_OK)
 295                 return SR_ERR;
 296
 297         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 298                         cmdstring, 8, &tmp, 100)) != 0) {
 299                 sr_err("Failed to set trigger/samplerate: %s.",
 300                        libusb_error_name(ret));
 301                 return SR_ERR;
 302         }
 303
 304         /* Frame size */
 305         sr_dbg("Frame size: %d.", devc->framesize);
 306         cmdstring[0] = CMD_2250_SET_RECORD_LENGTH;
 307         cmdstring[2] = (devc->framesize == FRAMESIZE_SMALL) ? 0x01 : 0x02;
 308
 309         if (send_begin(sdi) != SR_OK)
 310                 return SR_ERR;
 311
 312         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 313                         cmdstring, 4, &tmp, 100)) != 0) {
 314                 sr_err("Failed to set record length: %s.",
 315                        libusb_error_name(ret));
 316                 return SR_ERR;
 317         }
 318
 319         memset(cmdstring, 0, sizeof(cmdstring));
 320         cmdstring[0] = CMD_2250_SET_SAMPLERATE;
 321         base = 100e6;
 322         if (devc->samplerate > base) {
 323                 /* Timebase fast */
 324                 sr_err("Sample rate > 100MHz not yet supported.");
 325                 return SR_ERR_ARG;
 326         }
 327
 328         tmp = base / devc->samplerate;
 329         /* Downsample only if really necessary */
 330         if (tmp > 1) {
 331                 /* Downsampling on */
 332                 cmdstring[2] |= 2;
 333                 /* Downsampler = 1comp((Base / Samplerate) - 2)
 334                  *  Base == 100Msa resp. 200MSa
 335                  *
 336                  * Example for 500kSa/s:
 337                  *  100e6 / 500e3 => 200
 338                  *  200 - 2 => 198
 339                  *  1comp(198) => ff39 */
 340                 tmp -= 2;
 341                 tmp = ~tmp;
 342                 sr_dbg("Down sampler value: 0x%x.", tmp & 0xffff);
 343                 cmdstring[4] = (tmp >> 0) & 0xff;
 344                 cmdstring[5] = (tmp >> 8) & 0xff;
 345         }
 346
 347         if (send_begin(sdi) != SR_OK)
 348                 return SR_ERR;
 349
 350         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 351                         cmdstring, 8, &tmp, 100)) != 0) {
 352                 sr_err("Failed to set sample rate: %s.",
 353                        libusb_error_name(ret));
 354                 return SR_ERR;
 355         }
 356         sr_dbg("Sent CMD_2250_SET_SAMPLERATE.");
 357
 358         /* Enabled channels: 00=CH1, 01=CH2, 10=both. */
 359         memset(cmdstring, 0, sizeof(cmdstring));
 360         cmdstring[0] = CMD_2250_SET_CHANNELS;
 361         sr_dbg("Channels: CH1=%d, CH2=%d.", devc->ch_enabled[0], devc->ch_enabled[1]);
 362         cmdstring[2] = (devc->ch_enabled[0] ? 0 : 1) + (devc->ch_enabled[1] ? 2 : 0);
 363
 364         if (send_begin(sdi) != SR_OK)
 365                 return SR_ERR;
 366
 367         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 368                         cmdstring, 4, &tmp, 100)) != 0) {
 369                 sr_err("Failed to set channels: %s.",
 370                        libusb_error_name(ret));
 371                 return SR_ERR;
 372         }
 373         sr_dbg("Sent CMD_2250_SET_CHANNELS.");
 374
 375         /* Trigger slope: 0=positive, 1=negative. */
 376         memset(cmdstring, 0, sizeof(cmdstring));
 377         cmdstring[0] = CMD_2250_SET_TRIGGERPOS_AND_BUFFER;
 378
 379         sr_dbg("Capture ratio: %" PRIu64 ".", devc->capture_ratio);
 380         trig = devc->capture_ratio;
 381         dso2250_set_triggerpos(trig,
 382                         devc->framesize != FRAMESIZE_SMALL, cmdstring, 2);
 383         dso2250_set_triggerpos(100 - trig,
 384                         devc->framesize != FRAMESIZE_SMALL, cmdstring, 6);
 385
 386         if (send_begin(sdi) != SR_OK)
 387                 return SR_ERR;
 388
 389         /* TODO: 12 bytes according to documentation? */
 390         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 391                         cmdstring, 10, &tmp, 100)) != 0) {
 392                 sr_err("Failed to set trigger position: %s.",
 393                        libusb_error_name(ret));
 394                 return SR_ERR;
 395         }
 396
 397         return SR_OK;
 398 }
 399
 400 SR_PRIV int dso_set_trigger_samplerate(const struct sr_dev_inst *sdi)
 401 {
 402         struct dev_context *devc;
 403         struct sr_usb_dev_inst *usb;
 404         int ret, tmp;
 405         uint8_t cmdstring[12];
 406         uint16_t timebase_small[] = { 0xffff, 0xfffc, 0xfff7, 0xffe8, 0xffce,
 407                 0xff9c, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79, 0xd8f1 };
 408         uint16_t timebase_large[] = { 0xffff, 0x0000, 0xfffc, 0xfff7, 0xffe8,
 409                 0xffce, 0xff9d, 0xff07, 0xfe0d, 0xfc19, 0xf63d, 0xec79 };
 410
 411         devc = sdi->priv;
 412         if (devc->profile->fw_pid == 0x2250)
 413                 return dso2250_set_trigger_samplerate(sdi);
 414
 415         sr_dbg("Preparing CMD_SET_TRIGGER_SAMPLERATE.");
 416
 417         usb = sdi->conn;
 418
 419         memset(cmdstring, 0, sizeof(cmdstring));
 420         /* Command */
 421         cmdstring[0] = CMD_SET_TRIGGER_SAMPLERATE;
 422
 423         /* Trigger source */
 424         sr_dbg("Trigger source %s.", devc->triggersource);
 425         if (!strcmp("CH2", devc->triggersource))
 426                 tmp = 0;
 427         else if (!strcmp("CH1", devc->triggersource))
 428                 tmp = 1;
 429         else if (!strcmp("EXT", devc->triggersource))
 430                 tmp = 2;
 431         else {
 432                 sr_err("Invalid trigger source: '%s'.", devc->triggersource);
 433                 return SR_ERR_ARG;
 434         }
 435         cmdstring[2] = tmp;
 436
 437         /* Frame size */
 438         sr_dbg("Frame size: %d.", devc->framesize);
 439         cmdstring[2] |= (devc->framesize == FRAMESIZE_SMALL ? 0x01 : 0x02) << 2;
 440
 441         /* Timebase fast */
 442         sr_dbg("Time base index: %d.", devc->timebase);
 443         if (devc->framesize == FRAMESIZE_SMALL) {
 444                 if (devc->timebase < TIME_20us)
 445                         tmp = 0;
 446                 else if (devc->timebase == TIME_20us)
 447                         tmp = 1;
 448                 else if (devc->timebase == TIME_40us)
 449                         tmp = 2;
 450                 else if (devc->timebase == TIME_100us)
 451                         tmp = 3;
 452                 else if (devc->timebase >= TIME_200us)
 453                         tmp = 4;
 454         } else {
 455                 if (devc->timebase < TIME_40us) {
 456                         sr_err("Timebase < 40us only supported with 10K buffer.");
 457                         return SR_ERR_ARG;
 458                 }
 459                 else if (devc->timebase == TIME_40us)
 460                         tmp = 0;
 461                 else if (devc->timebase == TIME_100us)
 462                         tmp = 2;
 463                 else if (devc->timebase == TIME_200us)
 464                         tmp = 3;
 465                 else if (devc->timebase >= TIME_400us)
 466                         tmp = 4;
 467         }
 468         cmdstring[2] |= (tmp & 0x07) << 5;
 469
 470         /* Enabled channels: 00=CH1 01=CH2 10=both */
 471         sr_dbg("Channels CH1=%d CH2=%d", devc->ch_enabled[0], devc->ch_enabled[1]);
 472         tmp = (((devc->ch_enabled[1] ? 1 : 0) << 1) + (devc->ch_enabled[0] ? 1 : 0)) - 1;
 473         cmdstring[3] = tmp;
 474
 475         /* Fast rates channel */
 476         /* TODO: Is this right? */
 477         tmp = devc->timebase < TIME_10us ? 1 : 0;
 478         cmdstring[3] |= tmp << 2;
 479
 480         /* Trigger slope: 0=positive 1=negative */
 481         /* TODO: Does this work? */
 482         sr_dbg("Trigger slope: %d.", devc->triggerslope);
 483         cmdstring[3] |= (devc->triggerslope == SLOPE_NEGATIVE ? 1 : 0) << 3;
 484
 485         /* Timebase slow */
 486         if (devc->timebase < TIME_100us)
 487                 tmp = 0;
 488         else if (devc->timebase > TIME_400ms)
 489                 tmp = 0xffed;
 490         else {
 491                 if (devc->framesize == FRAMESIZE_SMALL)
 492                         tmp = timebase_small[devc->timebase - 3];
 493                 else
 494                         tmp = timebase_large[devc->timebase - 3];
 495         }
 496         cmdstring[4] = tmp & 0xff;
 497         cmdstring[5] = (tmp >> 8) & 0xff;
 498
 499         /* Horizontal trigger position */
 500         sr_dbg("Capture ratio: %" PRIu64 ".", devc->capture_ratio);
 501         tmp = 0x77fff + 0x8000 * devc->capture_ratio / 100;
 502         cmdstring[6] = tmp & 0xff;
 503         cmdstring[7] = (tmp >> 8) & 0xff;
 504         cmdstring[10] = (tmp >> 16) & 0xff;
 505
 506         if (send_begin(sdi) != SR_OK)
 507                 return SR_ERR;
 508
 509         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 510                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 511                 sr_err("Failed to set trigger/samplerate: %s.",
 512                        libusb_error_name(ret));
 513                 return SR_ERR;
 514         }
 515         sr_dbg("Sent CMD_SET_TRIGGER_SAMPLERATE.");
 516
 517         return SR_OK;
 518 }
 519
 520 static int dso_set_filters(const struct sr_dev_inst *sdi)
 521 {
 522         struct dev_context *devc;
 523         struct sr_usb_dev_inst *usb;
 524         int ret, tmp;
 525         uint8_t cmdstring[8];
 526
 527         sr_dbg("Preparing CMD_SET_FILTERS.");
 528
 529         devc = sdi->priv;
 530         usb = sdi->conn;
 531
 532         memset(cmdstring, 0, sizeof(cmdstring));
 533         cmdstring[0] = CMD_SET_FILTERS;
 534         cmdstring[1] = 0x0f;
 535         if (devc->filter[0]) {
 536                 sr_dbg("Turning on CH1 filter.");
 537                 cmdstring[2] |= 0x80;
 538         }
 539         if (devc->filter[1]) {
 540                 sr_dbg("Turning on CH2 filter.");
 541                 cmdstring[2] |= 0x40;
 542         }
 543         /*
 544          * Not supported: filtering on the trigger
 545          * cmdstring[2] |= 0x20;
 546          */
 547
 548         if (send_begin(sdi) != SR_OK)
 549                 return SR_ERR;
 550
 551         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 552                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 553                 sr_err("Failed to set filters: %s.", libusb_error_name(ret));
 554                 return SR_ERR;
 555         }
 556         sr_dbg("Sent CMD_SET_FILTERS.");
 557
 558         return SR_OK;
 559 }
 560
 561 static int dso_set_voltage(const struct sr_dev_inst *sdi)
 562 {
 563         struct dev_context *devc;
 564         struct sr_usb_dev_inst *usb;
 565         int ret, tmp;
 566         uint8_t cmdstring[8];
 567
 568         sr_dbg("Preparing CMD_SET_VOLTAGE.");
 569
 570         devc = sdi->priv;
 571         usb = sdi->conn;
 572
 573         memset(cmdstring, 0, sizeof(cmdstring));
 574         cmdstring[0] = CMD_SET_VOLTAGE;
 575
 576         if (devc->profile->fw_pid == 0x2250) {
 577                 cmdstring[1] = 0x00;
 578                 cmdstring[2] = 0x08;
 579         } else {
 580                 cmdstring[1] = 0x0f;
 581                 cmdstring[2] = 0x30;
 582         }
 583
 584         /* CH1 volts/div is encoded in bits 0-1. */
 585         sr_dbg("CH1 vdiv index: %d.", devc->voltage[0]);
 586         switch (devc->voltage[0]) {
 587         case VDIV_1V:
 588         case VDIV_100MV:
 589         case VDIV_10MV:
 590                 cmdstring[2] |= 0x00;
 591                 break;
 592         case VDIV_2V:
 593         case VDIV_200MV:
 594         case VDIV_20MV:
 595                 cmdstring[2] |= 0x01;
 596                 break;
 597         case VDIV_5V:
 598         case VDIV_500MV:
 599         case VDIV_50MV:
 600                 cmdstring[2] |= 0x02;
 601                 break;
 602         }
 603
 604         /* CH2 volts/div is encoded in bits 2-3. */
 605         sr_dbg("CH2 vdiv index: %d.", devc->voltage[1]);
 606         switch (devc->voltage[1]) {
 607         case VDIV_1V:
 608         case VDIV_100MV:
 609         case VDIV_10MV:
 610                 cmdstring[2] |= 0x00;
 611                 break;
 612         case VDIV_2V:
 613         case VDIV_200MV:
 614         case VDIV_20MV:
 615                 cmdstring[2] |= 0x04;
 616                 break;
 617         case VDIV_5V:
 618         case VDIV_500MV:
 619         case VDIV_50MV:
 620                 cmdstring[2] |= 0x08;
 621                 break;
 622         }
 623
 624         if (send_begin(sdi) != SR_OK)
 625                 return SR_ERR;
 626
 627         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 628                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 629                 sr_err("Failed to set voltage: %s.", libusb_error_name(ret));
 630                 return SR_ERR;
 631         }
 632         sr_dbg("Sent CMD_SET_VOLTAGE.");
 633
 634         return SR_OK;
 635 }
 636
 637 static int dso_set_relays(const struct sr_dev_inst *sdi)
 638 {
 639         struct dev_context *devc;
 640         struct sr_usb_dev_inst *usb;
 641         GString *gs;
 642         int ret, i;
 643         uint8_t relays[17] = { 0x00, 0x04, 0x08, 0x02, 0x20, 0x40, 0x10, 0x01,
 644                         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 645
 646         sr_dbg("Preparing CTRL_SETRELAYS.");
 647
 648         devc = sdi->priv;
 649         usb = sdi->conn;
 650
 651         if (devc->voltage[0] < VDIV_1V)
 652                 relays[1] = ~relays[1];
 653
 654         if (devc->voltage[0] < VDIV_100MV)
 655                 relays[2] = ~relays[2];
 656
 657         sr_dbg("CH1 coupling: %d.", devc->coupling[0]);
 658         if (devc->coupling[0] != COUPLING_AC)
 659                 relays[3] = ~relays[3];
 660
 661         if (devc->voltage[1] < VDIV_1V)
 662                 relays[4] = ~relays[4];
 663
 664         if (devc->voltage[1] < VDIV_100MV)
 665                 relays[5] = ~relays[5];
 666
 667         sr_dbg("CH2 coupling: %d.", devc->coupling[1]);
 668         if (devc->coupling[1] != COUPLING_AC)
 669                 relays[6] = ~relays[6];
 670
 671         if (!strcmp(devc->triggersource, "EXT"))
 672                 relays[7] = ~relays[7];
 673
 674         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 675                 gs = g_string_sized_new(128);
 676                 g_string_printf(gs, "Relays:");
 677                 for (i = 0; i < 17; i++)
 678                         g_string_append_printf(gs, " %.2x", relays[i]);
 679                 sr_dbg("%s", gs->str);
 680                 g_string_free(gs, TRUE);
 681         }
 682
 683         if ((ret = libusb_control_transfer(usb->devhdl,
 684                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETRELAYS,
 685                         0, 0, relays, 17, 100)) != sizeof(relays)) {
 686                 sr_err("Failed to set relays: %s.", libusb_error_name(ret));
 687                 return SR_ERR;
 688         }
 689         sr_dbg("Sent CTRL_SETRELAYS.");
 690
 691         return SR_OK;
 692 }
 693
 694 SR_PRIV int dso_set_voffsets(const struct sr_dev_inst *sdi)
 695 {
 696         struct dev_context *devc;
 697         struct sr_usb_dev_inst *usb;
 698         int offset, ret;
 699         uint16_t *ch_levels;
 700         uint8_t offsets[17];
 701
 702         sr_dbg("Preparing CTRL_SETOFFSET.");
 703
 704         devc = sdi->priv;
 705         usb = sdi->conn;
 706
 707         memset(offsets, 0, sizeof(offsets));
 708         /* Channel 1 */
 709         ch_levels = devc->channel_levels[0][devc->voltage[0]];
 710         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch1 + ch_levels[0];
 711         offsets[0] = (offset >> 8) | 0x20;
 712         offsets[1] = offset & 0xff;
 713         sr_dbg("CH1 offset: %3.2f (%.2x%.2x).", devc->voffset_ch1,
 714                offsets[0], offsets[1]);
 715
 716         /* Channel 2 */
 717         ch_levels = devc->channel_levels[1][devc->voltage[1]];
 718         offset = (ch_levels[1] - ch_levels[0]) * devc->voffset_ch2 + ch_levels[0];
 719         offsets[2] = (offset >> 8) | 0x20;
 720         offsets[3] = offset & 0xff;
 721         sr_dbg("CH2 offset: %3.2f (%.2x%.2x).", devc->voffset_ch2,
 722                offsets[2], offsets[3]);
 723
 724         /* Trigger */
 725         offset = MAX_VERT_TRIGGER * devc->voffset_trigger;
 726         offsets[4] = (offset >> 8) | 0x20;
 727         offsets[5] = offset & 0xff;
 728         sr_dbg("Trigger offset: %3.2f (%.2x%.2x).", devc->voffset_trigger,
 729                         offsets[4], offsets[5]);
 730
 731         if ((ret = libusb_control_transfer(usb->devhdl,
 732                         LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETOFFSET,
 733                         0, 0, offsets, sizeof(offsets), 100)) != sizeof(offsets)) {
 734                 sr_err("Failed to set offsets: %s.", libusb_error_name(ret));
 735                 return SR_ERR;
 736         }
 737         sr_dbg("Sent CTRL_SETOFFSET.");
 738
 739         return SR_OK;
 740 }
 741
 742 SR_PRIV int dso_enable_trigger(const struct sr_dev_inst *sdi)
 743 {
 744         struct sr_usb_dev_inst *usb;
 745         int ret, tmp;
 746         uint8_t cmdstring[2];
 747
 748         sr_dbg("Sending CMD_ENABLE_TRIGGER.");
 749
 750         usb = sdi->conn;
 751
 752         memset(cmdstring, 0, sizeof(cmdstring));
 753         cmdstring[0] = CMD_ENABLE_TRIGGER;
 754         cmdstring[1] = 0x00;
 755
 756         if (send_begin(sdi) != SR_OK)
 757                 return SR_ERR;
 758
 759         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 760                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 761                 sr_err("Failed to enable trigger: %s.", libusb_error_name(ret));
 762                 return SR_ERR;
 763         }
 764
 765         return SR_OK;
 766 }
 767
 768 SR_PRIV int dso_force_trigger(const struct sr_dev_inst *sdi)
 769 {
 770         struct sr_usb_dev_inst *usb;
 771         int ret, tmp;
 772         uint8_t cmdstring[2];
 773
 774         sr_dbg("Sending CMD_FORCE_TRIGGER.");
 775
 776         usb = sdi->conn;
 777
 778         memset(cmdstring, 0, sizeof(cmdstring));
 779         cmdstring[0] = CMD_FORCE_TRIGGER;
 780         cmdstring[1] = 0x00;
 781
 782         if (send_begin(sdi) != SR_OK)
 783                 return SR_ERR;
 784
 785         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 786                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 787                 sr_err("Failed to force trigger: %s.", libusb_error_name(ret));
 788                 return SR_ERR;
 789         }
 790
 791         return SR_OK;
 792 }
 793
 794 SR_PRIV int dso_init(const struct sr_dev_inst *sdi)
 795 {
 796         sr_dbg("Initializing DSO.");
 797
 798         if (get_channel_offsets(sdi) != SR_OK)
 799                 return SR_ERR;
 800
 801         if (dso_set_trigger_samplerate(sdi) != SR_OK)
 802                 return SR_ERR;
 803
 804         if (dso_set_filters(sdi) != SR_OK)
 805                 return SR_ERR;
 806
 807         if (dso_set_voltage(sdi) != SR_OK)
 808                 return SR_ERR;
 809
 810         if (dso_set_relays(sdi) != SR_OK)
 811                 return SR_ERR;
 812
 813         if (dso_set_voffsets(sdi) != SR_OK)
 814                 return SR_ERR;
 815
 816         if (dso_enable_trigger(sdi) != SR_OK)
 817                 return SR_ERR;
 818
 819         return SR_OK;
 820 }
 821
 822 SR_PRIV int dso_get_capturestate(const struct sr_dev_inst *sdi,
 823                 uint8_t *capturestate, uint32_t *trigger_offset)
 824 {
 825         struct sr_usb_dev_inst *usb;
 826         int ret, tmp, i;
 827         unsigned int bitvalue, toff;
 828         uint8_t cmdstring[2], inbuf[512];
 829
 830         sr_dbg("Sending CMD_GET_CAPTURESTATE.");
 831
 832         usb = sdi->conn;
 833
 834         cmdstring[0] = CMD_GET_CAPTURESTATE;
 835         cmdstring[1] = 0;
 836
 837         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 838                 sr_dbg("Failed to send get_capturestate command: %s.",
 839                        libusb_error_name(ret));
 840                 return SR_ERR;
 841         }
 842
 843         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_IN,
 844                         inbuf, 512, &tmp, 100)) != 0) {
 845                 sr_dbg("Failed to get capturestate: %s.",
 846                        libusb_error_name(ret));
 847                 return SR_ERR;
 848         }
 849         *capturestate = inbuf[0];
 850         toff = (inbuf[1] << 16) | (inbuf[3] << 8) | inbuf[2];
 851
 852         /*
 853          * This conversion comes from the openhantek project.
 854          * Each set bit in the 24-bit value inverts all bits with a lower
 855          * value. No idea why the device reports the trigger point this way.
 856          */
 857         bitvalue = 1;
 858         for (i = 0; i < 24; i++) {
 859                 /* Each set bit inverts all bits with a lower value. */
 860                 if (toff & bitvalue)
 861                         toff ^= bitvalue - 1;
 862                 bitvalue <<= 1;
 863         }
 864         *trigger_offset = toff;
 865
 866         return SR_OK;
 867 }
 868
 869 SR_PRIV int dso_capture_start(const struct sr_dev_inst *sdi)
 870 {
 871         int ret;
 872         uint8_t cmdstring[2];
 873
 874         sr_dbg("Sending CMD_CAPTURE_START.");
 875
 876         cmdstring[0] = CMD_CAPTURE_START;
 877         cmdstring[1] = 0;
 878
 879         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 880                 sr_err("Failed to send capture_start command: %s.",
 881                        libusb_error_name(ret));
 882                 return SR_ERR;
 883         }
 884
 885         return SR_OK;
 886 }
 887
 888 SR_PRIV int dso_get_channeldata(const struct sr_dev_inst *sdi,
 889                 libusb_transfer_cb_fn cb)
 890 {
 891         struct dev_context *devc;
 892         struct sr_usb_dev_inst *usb;
 893         struct libusb_transfer *transfer;
 894         int num_transfers, ret, i;
 895         uint8_t cmdstring[2];
 896         unsigned char *buf;
 897
 898         sr_dbg("Sending CMD_GET_CHANNELDATA.");
 899
 900         devc = sdi->priv;
 901         usb = sdi->conn;
 902
 903         cmdstring[0] = CMD_GET_CHANNELDATA;
 904         cmdstring[1] = 0;
 905
 906         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 907                 sr_err("Failed to get channel data: %s.",
 908                        libusb_error_name(ret));
 909                 return SR_ERR;
 910         }
 911
 912         /* TODO: DSO-2xxx only. */
 913         num_transfers = devc->framesize *
 914                         sizeof(unsigned short) / devc->epin_maxpacketsize;
 915         sr_dbg("Queueing up %d transfers.", num_transfers);
 916         for (i = 0; i < num_transfers; i++) {
 917                 if (!(buf = g_try_malloc(devc->epin_maxpacketsize))) {
 918                         sr_err("Failed to malloc USB endpoint buffer.");
 919                         return SR_ERR_MALLOC;
 920                 }
 921                 transfer = libusb_alloc_transfer(0);
 922                 libusb_fill_bulk_transfer(transfer, usb->devhdl, DSO_EP_IN, buf,
 923                                 devc->epin_maxpacketsize, cb, (void *)sdi, 40);
 924                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 925                         sr_err("Failed to submit transfer: %s.",
 926                                libusb_error_name(ret));
 927                         /* TODO: Free them all. */
 928                         libusb_free_transfer(transfer);
 929                         g_free(buf);
 930                         return SR_ERR;
 931                 }
 932         }
 933
 934         return SR_OK;
 935 }