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 static int get_channel_offsets(const struct sr_dev_inst *sdi)
 190 {
 191         struct dev_context *devc;
 192         struct sr_usb_dev_inst *usb;
 193         GString *gs;
 194         int chan, v, ret;
 195
 196         sr_dbg("Getting channel offsets.");
 197
 198         devc = sdi->priv;
 199         usb = sdi->conn;
 200
 201         ret = libusb_control_transfer(usb->devhdl,
 202                         LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_VENDOR,
 203                         CTRL_READ_EEPROM, EEPROM_CHANNEL_OFFSETS, 0,
 204                         (unsigned char *)&devc->channel_levels,
 205                         sizeof(devc->channel_levels), 200);
 206         if (ret != sizeof(devc->channel_levels)) {
 207                 sr_err("Failed to get channel offsets: %s.",
 208                        libusb_error_name(ret));
 209                 return SR_ERR;
 210         }
 211
 212         /* Comes in as 16-bit numbers with the second byte always 0 on
 213          * the DSO-2090. Guessing this is supposed to be big-endian,
 214          * since that's how voltage offsets are submitted back to the DSO.
 215          * Convert to host order now, so we can use them natively.
 216          */
 217         for (chan = 0; chan < NUM_CHANNELS; chan++) {
 218                 for (v = 0; v < 9; v++) {
 219                         devc->channel_levels[chan][v][0] =
 220                                 g_ntohs(devc->channel_levels[chan][v][0]);
 221                         devc->channel_levels[chan][v][1] =
 222                                 g_ntohs(devc->channel_levels[chan][v][1]);
 223                 }
 224         }
 225
 226         if (sr_log_loglevel_get() >= SR_LOG_DBG) {
 227                 gs = g_string_sized_new(128);
 228                 for (chan = 0; chan < NUM_CHANNELS; chan++) {
 229                         g_string_printf(gs, "CH%d:", chan + 1);
 230                         for (v = 0; v < 9; v++) {
 231                                 g_string_append_printf(gs, " %.4x-%.4x",
 232                                         devc->channel_levels[chan][v][0],
 233                                         devc->channel_levels[chan][v][1]);
 234                         }
 235                         sr_dbg("%s", gs->str);
 236                 }
 237                 g_string_free(gs, TRUE);
 238         }
 239
 240         return SR_OK;
 241 }
 242
 243 static void dso2250_set_triggerpos(int value, int long_buffer, uint8_t dest[], int offset)
 244 {
 245         uint32_t min, max;
 246         uint32_t tmp, diff;
 247
 248         min = long_buffer ? 0 : 0x7d7ff;
 249         max = 0x7ffff;
 250
 251         diff = max - min;
 252         tmp = min + diff * value / 100;
 253         sr_dbg("2250 trigger pos: %3d%% * [0x%x,0x%x] == 0x%x", value, min, max, tmp);
 254
 255         dest[offset + 0] = tmp & 0xff;
 256         dest[offset + 1] = (tmp >> 8) & 0xff;
 257         dest[offset + 2] = (tmp >> 16) & 0x7;
 258 }
 259
 260 /* See http://openhantek.sourceforge.net/doc/namespaceHantek.html#ac1cd181814cf3da74771c29800b39028 */
 261 static int dso2250_set_trigger_samplerate(const struct sr_dev_inst *sdi)
 262 {
 263         struct dev_context *devc;
 264         struct sr_usb_dev_inst *usb;
 265         int ret, tmp;
 266         uint64_t base;
 267         uint8_t cmdstring[12];
 268         int trig;
 269
 270         devc = sdi->priv;
 271         usb = sdi->conn;
 272
 273         memset(cmdstring, 0, sizeof(cmdstring));
 274         /* Command */
 275         cmdstring[0] = CMD_2250_SET_TRIGGERSOURCE;
 276         sr_dbg("Trigger source %s.", devc->triggersource);
 277         if (!strcmp("CH2", devc->triggersource))
 278                 tmp = 3;
 279         else if (!strcmp("CH1", devc->triggersource))
 280                 tmp = 2;
 281         else if (!strcmp("EXT", devc->triggersource))
 282                 tmp = 0;
 283         else {
 284                 sr_err("Invalid trigger source: '%s'.", devc->triggersource);
 285                 return SR_ERR_ARG;
 286         }
 287         cmdstring[2] = tmp;
 288
 289         sr_dbg("Trigger slope: %d.", devc->triggerslope);
 290         cmdstring[2] |= (devc->triggerslope == SLOPE_NEGATIVE ? 1 : 0) << 3;
 291
 292         if (send_begin(sdi) != SR_OK)
 293                 return SR_ERR;
 294
 295         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 296                         cmdstring, 8, &tmp, 100)) != 0) {
 297                 sr_err("Failed to set trigger/samplerate: %s.",
 298                        libusb_error_name(ret));
 299                 return SR_ERR;
 300         }
 301
 302         /* Frame size */
 303         sr_dbg("Frame size: %d.", devc->framesize);
 304         cmdstring[0] = CMD_2250_SET_RECORD_LENGTH;
 305         cmdstring[2] = (devc->framesize == FRAMESIZE_SMALL) ? 0x01 : 0x02;
 306
 307         if (send_begin(sdi) != SR_OK)
 308                 return SR_ERR;
 309
 310         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 311                         cmdstring, 4, &tmp, 100)) != 0) {
 312                 sr_err("Failed to set record length: %s.",
 313                        libusb_error_name(ret));
 314                 return SR_ERR;
 315         }
 316
 317         memset(cmdstring, 0, sizeof(cmdstring));
 318         cmdstring[0] = CMD_2250_SET_SAMPLERATE;
 319         base = 100e6;
 320         if (devc->samplerate > base) {
 321                 /* Timebase fast */
 322                 sr_err("Sample rate > 100MHz not yet supported.");
 323                 return SR_ERR_ARG;
 324         }
 325
 326         tmp = base / devc->samplerate;
 327         if (tmp) {
 328                 /* Downsampling on */
 329                 cmdstring[2] |= 2;
 330                 /* Downsampler = 1comp((Base / Samplerate) - 2)
 331                  *  Base == 100Msa resp. 200MSa
 332                  *
 333                  * Example for 500kSa/s:
 334                  *  100e6 / 500e3 => 200
 335                  *  200 - 2 => 198
 336                  *  1comp(198) => ff39 */
 337                 tmp -= 2;
 338                 tmp = ~tmp;
 339                 sr_dbg("Down sampler value: 0x%x.", tmp & 0xffff);
 340                 cmdstring[4] = (tmp >> 0) & 0xff;
 341                 cmdstring[5] = (tmp >> 8) & 0xff;
 342         }
 343
 344         if (send_begin(sdi) != SR_OK)
 345                 return SR_ERR;
 346
 347         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 348                         cmdstring, 8, &tmp, 100)) != 0) {
 349                 sr_err("Failed to set sample rate: %s.",
 350                        libusb_error_name(ret));
 351                 return SR_ERR;
 352         }
 353         sr_dbg("Sent CMD_2250_SET_SAMPLERATE.");
 354
 355         /* Enabled channels: 00=CH1, 01=CH2, 10=both. */
 356         memset(cmdstring, 0, sizeof(cmdstring));
 357         cmdstring[0] = CMD_2250_SET_CHANNELS;
 358         sr_dbg("Channels: CH1=%d, CH2=%d.", devc->ch_enabled[0], devc->ch_enabled[1]);
 359         cmdstring[2] = (devc->ch_enabled[0] ? 0 : 1) + (devc->ch_enabled[1] ? 2 : 0);
 360
 361         if (send_begin(sdi) != SR_OK)
 362                 return SR_ERR;
 363
 364         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 365                         cmdstring, 4, &tmp, 100)) != 0) {
 366                 sr_err("Failed to set channels: %s.",
 367                        libusb_error_name(ret));
 368                 return SR_ERR;
 369         }
 370         sr_dbg("Sent CMD_2250_SET_CHANNELS.");
 371
 372         /* Trigger slope: 0=positive, 1=negative. */
 373         memset(cmdstring, 0, sizeof(cmdstring));
 374         cmdstring[0] = CMD_2250_SET_TRIGGERPOS_AND_BUFFER;
 375
 376         sr_dbg("Capture ratio: %" PRIu64 ".", devc->capture_ratio);
 377         trig = devc->capture_ratio;
 378         dso2250_set_triggerpos(trig,
 379                         devc->framesize != FRAMESIZE_SMALL, cmdstring, 2);
 380         dso2250_set_triggerpos(100 - trig,
 381                         devc->framesize != FRAMESIZE_SMALL, cmdstring, 6);
 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 SR_PRIV 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("Capture ratio: %" PRIu64 ".", devc->capture_ratio);
 498         tmp = 0x77fff + 0x8000 * devc->capture_ratio / 100;
 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 static int dso_set_filters(const struct sr_dev_inst *sdi)
 518 {
 519         struct dev_context *devc;
 520         struct sr_usb_dev_inst *usb;
 521         int ret, tmp;
 522         uint8_t cmdstring[8];
 523
 524         sr_dbg("Preparing CMD_SET_FILTERS.");
 525
 526         devc = sdi->priv;
 527         usb = sdi->conn;
 528
 529         memset(cmdstring, 0, sizeof(cmdstring));
 530         cmdstring[0] = CMD_SET_FILTERS;
 531         cmdstring[1] = 0x0f;
 532         if (devc->filter[0]) {
 533                 sr_dbg("Turning on CH1 filter.");
 534                 cmdstring[2] |= 0x80;
 535         }
 536         if (devc->filter[1]) {
 537                 sr_dbg("Turning on CH2 filter.");
 538                 cmdstring[2] |= 0x40;
 539         }
 540         /*
 541          * Not supported: filtering on the trigger
 542          * cmdstring[2] |= 0x20;
 543          */
 544
 545         if (send_begin(sdi) != SR_OK)
 546                 return SR_ERR;
 547
 548         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_OUT,
 549                         cmdstring, sizeof(cmdstring), &tmp, 100)) != 0) {
 550                 sr_err("Failed to set filters: %s.", libusb_error_name(ret));
 551                 return SR_ERR;
 552         }
 553         sr_dbg("Sent CMD_SET_FILTERS.");
 554
 555         return SR_OK;
 556 }
 557
 558 static int dso_set_voltage(const struct sr_dev_inst *sdi)
 559 {
 560         struct dev_context *devc;
 561         struct sr_usb_dev_inst *usb;
 562         int ret, tmp;
 563         uint8_t cmdstring[8];
 564
 565         sr_dbg("Preparing CMD_SET_VOLTAGE.");
 566
 567         devc = sdi->priv;
 568         usb = sdi->conn;
 569
 570         memset(cmdstring, 0, sizeof(cmdstring));
 571         cmdstring[0] = CMD_SET_VOLTAGE;
 572
 573         if (devc->profile->fw_pid == 0x2250) {
 574                 cmdstring[1] = 0x00;
 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 SR_PRIV 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         sr_dbg("Initializing DSO.");
 794
 795         if (get_channel_offsets(sdi) != SR_OK)
 796                 return SR_ERR;
 797
 798         if (dso_set_trigger_samplerate(sdi) != SR_OK)
 799                 return SR_ERR;
 800
 801         if (dso_set_filters(sdi) != SR_OK)
 802                 return SR_ERR;
 803
 804         if (dso_set_voltage(sdi) != SR_OK)
 805                 return SR_ERR;
 806
 807         if (dso_set_relays(sdi) != SR_OK)
 808                 return SR_ERR;
 809
 810         if (dso_set_voffsets(sdi) != SR_OK)
 811                 return SR_ERR;
 812
 813         if (dso_enable_trigger(sdi) != SR_OK)
 814                 return SR_ERR;
 815
 816         return SR_OK;
 817 }
 818
 819 SR_PRIV int dso_get_capturestate(const struct sr_dev_inst *sdi,
 820                 uint8_t *capturestate, uint32_t *trigger_offset)
 821 {
 822         struct sr_usb_dev_inst *usb;
 823         int ret, tmp, i;
 824         unsigned int bitvalue, toff;
 825         uint8_t cmdstring[2], inbuf[512];
 826
 827         sr_dbg("Sending CMD_GET_CAPTURESTATE.");
 828
 829         usb = sdi->conn;
 830
 831         cmdstring[0] = CMD_GET_CAPTURESTATE;
 832         cmdstring[1] = 0;
 833
 834         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 835                 sr_dbg("Failed to send get_capturestate command: %s.",
 836                        libusb_error_name(ret));
 837                 return SR_ERR;
 838         }
 839
 840         if ((ret = libusb_bulk_transfer(usb->devhdl, DSO_EP_IN,
 841                         inbuf, 512, &tmp, 100)) != 0) {
 842                 sr_dbg("Failed to get capturestate: %s.",
 843                        libusb_error_name(ret));
 844                 return SR_ERR;
 845         }
 846         *capturestate = inbuf[0];
 847         toff = (inbuf[1] << 16) | (inbuf[3] << 8) | inbuf[2];
 848
 849         /*
 850          * This conversion comes from the openhantek project.
 851          * Each set bit in the 24-bit value inverts all bits with a lower
 852          * value. No idea why the device reports the trigger point this way.
 853          */
 854         bitvalue = 1;
 855         for (i = 0; i < 24; i++) {
 856                 /* Each set bit inverts all bits with a lower value. */
 857                 if (toff & bitvalue)
 858                         toff ^= bitvalue - 1;
 859                 bitvalue <<= 1;
 860         }
 861         *trigger_offset = toff;
 862
 863         return SR_OK;
 864 }
 865
 866 SR_PRIV int dso_capture_start(const struct sr_dev_inst *sdi)
 867 {
 868         int ret;
 869         uint8_t cmdstring[2];
 870
 871         sr_dbg("Sending CMD_CAPTURE_START.");
 872
 873         cmdstring[0] = CMD_CAPTURE_START;
 874         cmdstring[1] = 0;
 875
 876         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 877                 sr_err("Failed to send capture_start command: %s.",
 878                        libusb_error_name(ret));
 879                 return SR_ERR;
 880         }
 881
 882         return SR_OK;
 883 }
 884
 885 SR_PRIV int dso_get_channeldata(const struct sr_dev_inst *sdi,
 886                 libusb_transfer_cb_fn cb)
 887 {
 888         struct dev_context *devc;
 889         struct sr_usb_dev_inst *usb;
 890         struct libusb_transfer *transfer;
 891         int num_transfers, ret, i;
 892         uint8_t cmdstring[2];
 893         unsigned char *buf;
 894
 895         sr_dbg("Sending CMD_GET_CHANNELDATA.");
 896
 897         devc = sdi->priv;
 898         usb = sdi->conn;
 899
 900         cmdstring[0] = CMD_GET_CHANNELDATA;
 901         cmdstring[1] = 0;
 902
 903         if ((ret = send_bulkcmd(sdi, cmdstring, sizeof(cmdstring))) != SR_OK) {
 904                 sr_err("Failed to get channel data: %s.",
 905                        libusb_error_name(ret));
 906                 return SR_ERR;
 907         }
 908
 909         /* TODO: DSO-2xxx only. */
 910         num_transfers = devc->framesize *
 911                         sizeof(unsigned short) / devc->epin_maxpacketsize;
 912         sr_dbg("Queueing up %d transfers.", num_transfers);
 913         for (i = 0; i < num_transfers; i++) {
 914                 if (!(buf = g_try_malloc(devc->epin_maxpacketsize))) {
 915                         sr_err("Failed to malloc USB endpoint buffer.");
 916                         return SR_ERR_MALLOC;
 917                 }
 918                 transfer = libusb_alloc_transfer(0);
 919                 libusb_fill_bulk_transfer(transfer, usb->devhdl, DSO_EP_IN, buf,
 920                                 devc->epin_maxpacketsize, cb, (void *)sdi, 40);
 921                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 922                         sr_err("Failed to submit transfer: %s.",
 923                                libusb_error_name(ret));
 924                         /* TODO: Free them all. */
 925                         libusb_free_transfer(transfer);
 926                         g_free(buf);
 927                         return SR_ERR;
 928                 }
 929         }
 930
 931         return SR_OK;
 932 }