src/hardware/zeroplus-logic-cube/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21 #include "protocol.h"
  22
  23 #define VENDOR_NAME                     "ZEROPLUS"
  24 #define USB_INTERFACE                   0
  25 #define USB_CONFIGURATION               1
  26 #define NUM_TRIGGER_STAGES              4
  27 #define PACKET_SIZE                     2048    /* ?? */
  28
  29 //#define ZP_EXPERIMENTAL
  30
  31 struct zp_model {
  32         uint16_t vid;
  33         uint16_t pid;
  34         const char *model_name;
  35         unsigned int channels;
  36         unsigned int sample_depth;      /* In Ksamples/channel */
  37         unsigned int max_sampling_freq;
  38 };
  39
  40 /*
  41  * Note -- 16032, 16064 and 16128 *usually* -- but not always -- have the
  42  * same 128K sample depth.
  43  */
  44 static const struct zp_model zeroplus_models[] = {
  45         {0x0c12, 0x7002, "LAP-16128U",    16, 128,  200},
  46         {0x0c12, 0x7009, "LAP-C(16064)",  16, 64,   100},
  47         {0x0c12, 0x700a, "LAP-C(16128)",  16, 128,  200},
  48         {0x0c12, 0x700b, "LAP-C(32128)",  32, 128,  200},
  49         {0x0c12, 0x700c, "LAP-C(321000)", 32, 1024, 200},
  50         {0x0c12, 0x700d, "LAP-C(322000)", 32, 2048, 200},
  51         {0x0c12, 0x700e, "LAP-C(16032)",  16, 32,   100},
  52         {0x0c12, 0x7016, "LAP-C(162000)", 16, 2048, 200},
  53         {0x0c12, 0x7100, "AKIP-9101", 16, 256, 200},
  54         ALL_ZERO
  55 };
  56
  57 static const uint32_t drvopts[] = {
  58         SR_CONF_LOGIC_ANALYZER,
  59 };
  60
  61 static const uint32_t devopts[] = {
  62         SR_CONF_LIMIT_SAMPLES | SR_CONF_SET | SR_CONF_LIST,
  63         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  64         SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
  65         SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
  66         SR_CONF_VOLTAGE_THRESHOLD | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  67 };
  68
  69 static const int32_t trigger_matches[] = {
  70         SR_TRIGGER_ZERO,
  71         SR_TRIGGER_ONE,
  72 };
  73
  74 /*
  75  * ZEROPLUS LAP-C (16032) numbers the 16 channels A0-A7 and B0-B7.
  76  * We currently ignore other untested/unsupported devices here.
  77  */
  78 static const char *channel_names[] = {
  79         "A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7",
  80         "B0", "B1", "B2", "B3", "B4", "B5", "B6", "B7",
  81         "C0", "C1", "C2", "C3", "C4", "C5", "C6", "C7",
  82         "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",
  83 };
  84
  85 /*
  86  * The hardware supports more samplerates than these, but these are the
  87  * options hardcoded into the vendor's Windows GUI.
  88  */
  89
  90 static const uint64_t samplerates_100[] = {
  91         SR_HZ(100),
  92         SR_HZ(500),
  93         SR_KHZ(1),
  94         SR_KHZ(5),
  95         SR_KHZ(25),
  96         SR_KHZ(50),
  97         SR_KHZ(100),
  98         SR_KHZ(200),
  99         SR_KHZ(400),
 100         SR_KHZ(800),
 101         SR_MHZ(1),
 102         SR_MHZ(10),
 103         SR_MHZ(25),
 104         SR_MHZ(50),
 105         SR_MHZ(80),
 106         SR_MHZ(100),
 107 };
 108
 109 const uint64_t samplerates_200[] = {
 110         SR_HZ(100),
 111         SR_HZ(500),
 112         SR_KHZ(1),
 113         SR_KHZ(5),
 114         SR_KHZ(25),
 115         SR_KHZ(50),
 116         SR_KHZ(100),
 117         SR_KHZ(200),
 118         SR_KHZ(400),
 119         SR_KHZ(800),
 120         SR_MHZ(1),
 121         SR_MHZ(10),
 122         SR_MHZ(25),
 123         SR_MHZ(50),
 124         SR_MHZ(80),
 125         SR_MHZ(100),
 126         SR_MHZ(150),
 127         SR_MHZ(200),
 128 };
 129
 130 SR_PRIV int zp_set_samplerate(struct dev_context *devc, uint64_t samplerate)
 131 {
 132         int i;
 133
 134         for (i = 0; ARRAY_SIZE(samplerates_200); i++)
 135                 if (samplerate == samplerates_200[i])
 136                         break;
 137
 138         if (i == ARRAY_SIZE(samplerates_200) || samplerate > devc->max_samplerate) {
 139                 sr_err("Unsupported samplerate: %" PRIu64 "Hz.", samplerate);
 140                 return SR_ERR_ARG;
 141         }
 142
 143         sr_info("Setting samplerate to %" PRIu64 "Hz.", samplerate);
 144
 145         if (samplerate >= SR_MHZ(1))
 146                 analyzer_set_freq(samplerate / SR_MHZ(1), FREQ_SCALE_MHZ);
 147         else if (samplerate >= SR_KHZ(1))
 148                 analyzer_set_freq(samplerate / SR_KHZ(1), FREQ_SCALE_KHZ);
 149         else
 150                 analyzer_set_freq(samplerate, FREQ_SCALE_HZ);
 151
 152         devc->cur_samplerate = samplerate;
 153
 154         return SR_OK;
 155 }
 156
 157 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 158 {
 159         struct sr_dev_inst *sdi;
 160         struct drv_context *drvc;
 161         struct dev_context *devc;
 162         const struct zp_model *prof;
 163         struct libusb_device_descriptor des;
 164         struct libusb_device_handle *hdl;
 165         libusb_device **devlist;
 166         GSList *devices;
 167         int ret, i, j;
 168         char serial_num[64], connection_id[64];
 169
 170         (void)options;
 171
 172         drvc = di->context;
 173
 174         devices = NULL;
 175
 176         /* Find all ZEROPLUS analyzers and add them to device list. */
 177         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist); /* TODO: Errors. */
 178
 179         for (i = 0; devlist[i]; i++) {
 180                 libusb_get_device_descriptor(devlist[i], &des);
 181
 182                 if ((ret = libusb_open(devlist[i], &hdl)) < 0)
 183                         continue;
 184
 185                 if (des.iSerialNumber == 0) {
 186                         serial_num[0] = '\0';
 187                 } else if ((ret = libusb_get_string_descriptor_ascii(hdl,
 188                                 des.iSerialNumber, (unsigned char *) serial_num,
 189                                 sizeof(serial_num))) < 0) {
 190                         sr_warn("Failed to get serial number string descriptor: %s.",
 191                                 libusb_error_name(ret));
 192                         continue;
 193                 }
 194
 195                 libusb_close(hdl);
 196
 197                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 198
 199                 prof = NULL;
 200                 for (j = 0; j < zeroplus_models[j].vid; j++) {
 201                         if (des.idVendor == zeroplus_models[j].vid &&
 202                                 des.idProduct == zeroplus_models[j].pid) {
 203                                 prof = &zeroplus_models[j];
 204                         }
 205                 }
 206                 /* Skip if the device was not found. */
 207                 if (!prof)
 208                         continue;
 209                 sr_info("Found ZEROPLUS %s.", prof->model_name);
 210
 211                 /* Register the device with libsigrok. */
 212                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 213                 sdi->status = SR_ST_INACTIVE;
 214                 sdi->vendor = g_strdup(VENDOR_NAME);
 215                 sdi->model = g_strdup(prof->model_name);
 216                 sdi->serial_num = g_strdup(serial_num);
 217                 sdi->connection_id = g_strdup(connection_id);
 218
 219                 /* Allocate memory for our private driver context. */
 220                 devc = g_malloc0(sizeof(struct dev_context));
 221                 sdi->priv = devc;
 222                 devc->prof = prof;
 223                 devc->num_channels = prof->channels;
 224 #ifdef ZP_EXPERIMENTAL
 225                 devc->max_sample_depth = 128 * 1024;
 226                 devc->max_samplerate = 200;
 227 #else
 228                 devc->max_sample_depth = prof->sample_depth * 1024;
 229                 devc->max_samplerate = prof->max_sampling_freq;
 230 #endif
 231                 devc->max_samplerate *= SR_MHZ(1);
 232                 devc->memory_size = MEMORY_SIZE_8K;
 233                 // memset(devc->trigger_buffer, 0, NUM_TRIGGER_STAGES);
 234
 235                 /* Fill in channellist according to this device's profile. */
 236                 for (j = 0; j < devc->num_channels; j++)
 237                         sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE,
 238                                         channel_names[j]);
 239
 240                 devices = g_slist_append(devices, sdi);
 241                 sdi->inst_type = SR_INST_USB;
 242                 sdi->conn = sr_usb_dev_inst_new(
 243                         libusb_get_bus_number(devlist[i]),
 244                         libusb_get_device_address(devlist[i]), NULL);
 245         }
 246         libusb_free_device_list(devlist, 1);
 247
 248         return std_scan_complete(di, devices);
 249 }
 250
 251 static int dev_open(struct sr_dev_inst *sdi)
 252 {
 253         struct sr_dev_driver *di = sdi->driver;
 254         struct dev_context *devc;
 255         struct drv_context *drvc;
 256         struct sr_usb_dev_inst *usb;
 257         int ret;
 258
 259         drvc = di->context;
 260         usb = sdi->conn;
 261         devc = sdi->priv;
 262
 263         ret = sr_usb_open(drvc->sr_ctx->libusb_ctx, usb);
 264         if (ret != SR_OK)
 265                 return ret;
 266
 267         ret = libusb_set_configuration(usb->devhdl, USB_CONFIGURATION);
 268         if (ret < 0) {
 269                 sr_err("Unable to set USB configuration %d: %s.",
 270                        USB_CONFIGURATION, libusb_error_name(ret));
 271                 return SR_ERR;
 272         }
 273
 274         ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 275         if (ret != 0) {
 276                 sr_err("Unable to claim interface: %s.",
 277                        libusb_error_name(ret));
 278                 return SR_ERR;
 279         }
 280
 281         /* Set default configuration after power on. */
 282         if (analyzer_read_status(usb->devhdl) == 0)
 283                 analyzer_configure(usb->devhdl);
 284
 285         analyzer_reset(usb->devhdl);
 286         analyzer_initialize(usb->devhdl);
 287
 288         //analyzer_set_memory_size(MEMORY_SIZE_512K);
 289         // analyzer_set_freq(g_freq, g_freq_scale);
 290         analyzer_set_trigger_count(1);
 291         // analyzer_set_ramsize_trigger_address((((100 - g_pre_trigger)
 292         // * get_memory_size(g_memory_size)) / 100) >> 2);
 293
 294 #if 0
 295         if (g_double_mode == 1)
 296                 analyzer_set_compression(COMPRESSION_DOUBLE);
 297         else if (g_compression == 1)
 298                 analyzer_set_compression(COMPRESSION_ENABLE);
 299         else
 300 #endif
 301         analyzer_set_compression(COMPRESSION_NONE);
 302
 303         if (devc->cur_samplerate == 0) {
 304                 /* Samplerate hasn't been set. Default to 1MHz. */
 305                 analyzer_set_freq(1, FREQ_SCALE_MHZ);
 306                 devc->cur_samplerate = SR_MHZ(1);
 307         }
 308
 309         if (devc->cur_threshold == 0)
 310                 set_voltage_threshold(devc, 1.5);
 311
 312         return SR_OK;
 313 }
 314
 315 static int dev_close(struct sr_dev_inst *sdi)
 316 {
 317         struct sr_usb_dev_inst *usb;
 318
 319         usb = sdi->conn;
 320
 321         if (!usb->devhdl)
 322                 return SR_ERR_BUG;
 323
 324         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 325                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 326         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 327         libusb_reset_device(usb->devhdl);
 328         libusb_close(usb->devhdl);
 329         usb->devhdl = NULL;
 330
 331         return SR_OK;
 332 }
 333
 334 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 335                 const struct sr_channel_group *cg)
 336 {
 337         struct dev_context *devc;
 338         GVariant *range[2];
 339
 340         (void)cg;
 341
 342         if (!sdi)
 343                 return SR_ERR_ARG;
 344
 345         devc = sdi->priv;
 346
 347         switch (key) {
 348         case SR_CONF_SAMPLERATE:
 349                 *data = g_variant_new_uint64(devc->cur_samplerate);
 350                 break;
 351         case SR_CONF_CAPTURE_RATIO:
 352                 *data = g_variant_new_uint64(devc->capture_ratio);
 353                 break;
 354         case SR_CONF_VOLTAGE_THRESHOLD:
 355                 range[0] = g_variant_new_double(devc->cur_threshold);
 356                 range[1] = g_variant_new_double(devc->cur_threshold);
 357                 *data = g_variant_new_tuple(range, 2);
 358                 break;
 359         default:
 360                 return SR_ERR_NA;
 361         }
 362
 363         return SR_OK;
 364 }
 365
 366 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 367                 const struct sr_channel_group *cg)
 368 {
 369         struct dev_context *devc;
 370         gdouble low, high;
 371
 372         (void)cg;
 373
 374         devc = sdi->priv;
 375
 376         switch (key) {
 377         case SR_CONF_SAMPLERATE:
 378                 return zp_set_samplerate(devc, g_variant_get_uint64(data));
 379         case SR_CONF_LIMIT_SAMPLES:
 380                 return set_limit_samples(devc, g_variant_get_uint64(data));
 381         case SR_CONF_CAPTURE_RATIO:
 382                 return set_capture_ratio(devc, g_variant_get_uint64(data));
 383         case SR_CONF_VOLTAGE_THRESHOLD:
 384                 g_variant_get(data, "(dd)", &low, &high);
 385                 return set_voltage_threshold(devc, (low + high) / 2.0);
 386         default:
 387                 return SR_ERR_NA;
 388         }
 389
 390         return SR_OK;
 391 }
 392
 393 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 394                 const struct sr_channel_group *cg)
 395 {
 396         struct dev_context *devc;
 397         GVariant *gvar, *grange[2];
 398         GVariantBuilder gvb;
 399         double v;
 400         GVariant *range[2];
 401
 402         (void)cg;
 403
 404         switch (key) {
 405         case SR_CONF_DEVICE_OPTIONS:
 406                 if (!sdi) {
 407                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 408                                 drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
 409                 } else {
 410                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 411                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 412                 }
 413                 break;
 414         case SR_CONF_SAMPLERATE:
 415                 devc = sdi->priv;
 416                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 417                 if (devc->prof->max_sampling_freq == 100) {
 418                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 419                                         samplerates_100, ARRAY_SIZE(samplerates_100),
 420                                         sizeof(uint64_t));
 421                 } else if (devc->prof->max_sampling_freq == 200) {
 422                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 423                                         samplerates_200, ARRAY_SIZE(samplerates_200),
 424                                         sizeof(uint64_t));
 425                 } else {
 426                         sr_err("Internal error: Unknown max. samplerate: %d.",
 427                                devc->prof->max_sampling_freq);
 428                         return SR_ERR_ARG;
 429                 }
 430                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 431                 *data = g_variant_builder_end(&gvb);
 432                 break;
 433         case SR_CONF_TRIGGER_MATCH:
 434                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 435                                 trigger_matches, ARRAY_SIZE(trigger_matches),
 436                                 sizeof(int32_t));
 437                 break;
 438         case SR_CONF_VOLTAGE_THRESHOLD:
 439                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 440                 for (v = -6.0; v <= 6.0; v += 0.1) {
 441                         range[0] = g_variant_new_double(v);
 442                         range[1] = g_variant_new_double(v);
 443                         gvar = g_variant_new_tuple(range, 2);
 444                         g_variant_builder_add_value(&gvb, gvar);
 445                 }
 446                 *data = g_variant_builder_end(&gvb);
 447                 break;
 448         case SR_CONF_LIMIT_SAMPLES:
 449                 if (!sdi)
 450                         return SR_ERR_ARG;
 451                 devc = sdi->priv;
 452                 grange[0] = g_variant_new_uint64(0);
 453                 grange[1] = g_variant_new_uint64(devc->max_sample_depth);
 454                 *data = g_variant_new_tuple(grange, 2);
 455                 break;
 456         default:
 457                 return SR_ERR_NA;
 458         }
 459
 460         return SR_OK;
 461 }
 462
 463 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 464 {
 465         struct dev_context *devc;
 466         struct sr_usb_dev_inst *usb;
 467         struct sr_datafeed_packet packet;
 468         struct sr_datafeed_logic logic;
 469         unsigned int samples_read;
 470         int res;
 471         unsigned int packet_num, n;
 472         unsigned char *buf;
 473         unsigned int status;
 474         unsigned int stop_address;
 475         unsigned int now_address;
 476         unsigned int trigger_address;
 477         unsigned int trigger_offset;
 478         unsigned int triggerbar;
 479         unsigned int ramsize_trigger;
 480         unsigned int memory_size;
 481         unsigned int valid_samples;
 482         unsigned int discard;
 483         int trigger_now;
 484
 485         devc = sdi->priv;
 486
 487         if (analyzer_add_triggers(sdi) != SR_OK) {
 488                 sr_err("Failed to configure triggers.");
 489                 return SR_ERR;
 490         }
 491
 492         usb = sdi->conn;
 493
 494         set_triggerbar(devc);
 495
 496         /* Push configured settings to device. */
 497         analyzer_configure(usb->devhdl);
 498
 499         analyzer_start(usb->devhdl);
 500         sr_info("Waiting for data.");
 501         analyzer_wait_data(usb->devhdl);
 502
 503         status = analyzer_read_status(usb->devhdl);
 504         stop_address = analyzer_get_stop_address(usb->devhdl);
 505         now_address = analyzer_get_now_address(usb->devhdl);
 506         trigger_address = analyzer_get_trigger_address(usb->devhdl);
 507
 508         triggerbar = analyzer_get_triggerbar_address();
 509         ramsize_trigger = analyzer_get_ramsize_trigger_address();
 510
 511         n = get_memory_size(devc->memory_size);
 512         memory_size = n / 4;
 513
 514         sr_info("Status = 0x%x.", status);
 515         sr_info("Stop address       = 0x%x.", stop_address);
 516         sr_info("Now address        = 0x%x.", now_address);
 517         sr_info("Trigger address    = 0x%x.", trigger_address);
 518         sr_info("Triggerbar address = 0x%x.", triggerbar);
 519         sr_info("Ramsize trigger    = 0x%x.", ramsize_trigger);
 520         sr_info("Memory size        = 0x%x.", memory_size);
 521
 522         std_session_send_df_header(sdi);
 523
 524         /* Check for empty capture */
 525         if ((status & STATUS_READY) && !stop_address) {
 526                 std_session_send_df_end(sdi);
 527                 return SR_OK;
 528         }
 529
 530         buf = g_malloc(PACKET_SIZE);
 531
 532         /* Check if the trigger is in the samples we are throwing away */
 533         trigger_now = now_address == trigger_address ||
 534                 ((now_address + 1) % memory_size) == trigger_address;
 535
 536         /*
 537          * STATUS_READY doesn't clear until now_address advances past
 538          * addr 0, but for our logic, clear it in that case
 539          */
 540         if (!now_address)
 541                 status &= ~STATUS_READY;
 542
 543         analyzer_read_start(usb->devhdl);
 544
 545         /* Calculate how much data to discard */
 546         discard = 0;
 547         if (status & STATUS_READY) {
 548                 /*
 549                  * We haven't wrapped around, we need to throw away data from
 550                  * our current position to the end of the buffer.
 551                  * Additionally, the first two samples captured are always
 552                  * bogus.
 553                  */
 554                 discard += memory_size - now_address + 2;
 555                 now_address = 2;
 556         }
 557
 558         /* If we have more samples than we need, discard them */
 559         valid_samples = (stop_address - now_address) % memory_size;
 560         if (valid_samples > ramsize_trigger + triggerbar) {
 561                 discard += valid_samples - (ramsize_trigger + triggerbar);
 562                 now_address += valid_samples - (ramsize_trigger + triggerbar);
 563         }
 564
 565         sr_info("Need to discard %d samples.", discard);
 566
 567         /* Calculate how far in the trigger is */
 568         if (trigger_now)
 569                 trigger_offset = 0;
 570         else
 571                 trigger_offset = (trigger_address - now_address) % memory_size;
 572
 573         /* Recalculate the number of samples available */
 574         valid_samples = (stop_address - now_address) % memory_size;
 575
 576         /* Send the incoming transfer to the session bus. */
 577         samples_read = 0;
 578         for (packet_num = 0; packet_num < n / PACKET_SIZE; packet_num++) {
 579                 unsigned int len;
 580                 unsigned int buf_offset;
 581
 582                 res = analyzer_read_data(usb->devhdl, buf, PACKET_SIZE);
 583                 sr_info("Tried to read %d bytes, actually read %d bytes.",
 584                         PACKET_SIZE, res);
 585
 586                 if (discard >= PACKET_SIZE / 4) {
 587                         discard -= PACKET_SIZE / 4;
 588                         continue;
 589                 }
 590
 591                 len = PACKET_SIZE - discard * 4;
 592                 buf_offset = discard * 4;
 593                 discard = 0;
 594
 595                 /* Check if we've read all the samples */
 596                 if (samples_read + len / 4 >= valid_samples)
 597                         len = (valid_samples - samples_read) * 4;
 598                 if (!len)
 599                         break;
 600
 601                 if (samples_read < trigger_offset &&
 602                     samples_read + len / 4 > trigger_offset) {
 603                         /* Send out samples remaining before trigger */
 604                         packet.type = SR_DF_LOGIC;
 605                         packet.payload = &logic;
 606                         logic.length = (trigger_offset - samples_read) * 4;
 607                         logic.unitsize = 4;
 608                         logic.data = buf + buf_offset;
 609                         sr_session_send(sdi, &packet);
 610                         len -= logic.length;
 611                         samples_read += logic.length / 4;
 612                         buf_offset += logic.length;
 613                 }
 614
 615                 if (samples_read == trigger_offset) {
 616                         /* Send out trigger */
 617                         packet.type = SR_DF_TRIGGER;
 618                         packet.payload = NULL;
 619                         sr_session_send(sdi, &packet);
 620                 }
 621
 622                 /* Send out data (or data after trigger) */
 623                 packet.type = SR_DF_LOGIC;
 624                 packet.payload = &logic;
 625                 logic.length = len;
 626                 logic.unitsize = 4;
 627                 logic.data = buf + buf_offset;
 628                 sr_session_send(sdi, &packet);
 629                 samples_read += len / 4;
 630         }
 631         analyzer_read_stop(usb->devhdl);
 632         g_free(buf);
 633
 634         std_session_send_df_end(sdi);
 635
 636         return SR_OK;
 637 }
 638
 639 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 640 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 641 {
 642         struct sr_usb_dev_inst *usb;
 643
 644         std_session_send_df_end(sdi);
 645
 646         usb = sdi->conn;
 647         analyzer_reset(usb->devhdl);
 648         /* TODO: Need to cancel and free any queued up transfers. */
 649
 650         return SR_OK;
 651 }
 652
 653 static struct sr_dev_driver zeroplus_logic_cube_driver_info = {
 654         .name = "zeroplus-logic-cube",
 655         .longname = "ZEROPLUS Logic Cube LAP-C series",
 656         .api_version = 1,
 657         .init = std_init,
 658         .cleanup = std_cleanup,
 659         .scan = scan,
 660         .dev_list = std_dev_list,
 661         .dev_clear = NULL,
 662         .config_get = config_get,
 663         .config_set = config_set,
 664         .config_list = config_list,
 665         .dev_open = dev_open,
 666         .dev_close = dev_close,
 667         .dev_acquisition_start = dev_acquisition_start,
 668         .dev_acquisition_stop = dev_acquisition_stop,
 669         .context = NULL,
 670 };
 671 SR_REGISTER_DEV_DRIVER(zeroplus_logic_cube_driver_info);