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 static int dev_close(struct sr_dev_inst *sdi);
 131
 132 SR_PRIV int zp_set_samplerate(struct dev_context *devc, uint64_t samplerate)
 133 {
 134         int i;
 135
 136         for (i = 0; ARRAY_SIZE(samplerates_200); i++)
 137                 if (samplerate == samplerates_200[i])
 138                         break;
 139
 140         if (i == ARRAY_SIZE(samplerates_200) || samplerate > devc->max_samplerate) {
 141                 sr_err("Unsupported samplerate: %" PRIu64 "Hz.", samplerate);
 142                 return SR_ERR_ARG;
 143         }
 144
 145         sr_info("Setting samplerate to %" PRIu64 "Hz.", samplerate);
 146
 147         if (samplerate >= SR_MHZ(1))
 148                 analyzer_set_freq(samplerate / SR_MHZ(1), FREQ_SCALE_MHZ);
 149         else if (samplerate >= SR_KHZ(1))
 150                 analyzer_set_freq(samplerate / SR_KHZ(1), FREQ_SCALE_KHZ);
 151         else
 152                 analyzer_set_freq(samplerate, FREQ_SCALE_HZ);
 153
 154         devc->cur_samplerate = samplerate;
 155
 156         return SR_OK;
 157 }
 158
 159 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 160 {
 161         struct sr_dev_inst *sdi;
 162         struct drv_context *drvc;
 163         struct dev_context *devc;
 164         const struct zp_model *prof;
 165         struct libusb_device_descriptor des;
 166         struct libusb_device_handle *hdl;
 167         libusb_device **devlist;
 168         GSList *devices;
 169         int ret, i, j;
 170         char serial_num[64], connection_id[64];
 171
 172         (void)options;
 173
 174         drvc = di->context;
 175
 176         devices = NULL;
 177
 178         /* Find all ZEROPLUS analyzers and add them to device list. */
 179         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist); /* TODO: Errors. */
 180
 181         for (i = 0; devlist[i]; i++) {
 182                 libusb_get_device_descriptor(devlist[i], &des);
 183
 184                 if ((ret = libusb_open(devlist[i], &hdl)) < 0)
 185                         continue;
 186
 187                 if (des.iSerialNumber == 0) {
 188                         serial_num[0] = '\0';
 189                 } else if ((ret = libusb_get_string_descriptor_ascii(hdl,
 190                                 des.iSerialNumber, (unsigned char *) serial_num,
 191                                 sizeof(serial_num))) < 0) {
 192                         sr_warn("Failed to get serial number string descriptor: %s.",
 193                                 libusb_error_name(ret));
 194                         continue;
 195                 }
 196
 197                 libusb_close(hdl);
 198
 199                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 200
 201                 prof = NULL;
 202                 for (j = 0; j < zeroplus_models[j].vid; j++) {
 203                         if (des.idVendor == zeroplus_models[j].vid &&
 204                                 des.idProduct == zeroplus_models[j].pid) {
 205                                 prof = &zeroplus_models[j];
 206                         }
 207                 }
 208                 /* Skip if the device was not found. */
 209                 if (!prof)
 210                         continue;
 211                 sr_info("Found ZEROPLUS %s.", prof->model_name);
 212
 213                 /* Register the device with libsigrok. */
 214                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 215                 sdi->status = SR_ST_INACTIVE;
 216                 sdi->vendor = g_strdup(VENDOR_NAME);
 217                 sdi->model = g_strdup(prof->model_name);
 218                 sdi->serial_num = g_strdup(serial_num);
 219                 sdi->connection_id = g_strdup(connection_id);
 220
 221                 /* Allocate memory for our private driver context. */
 222                 devc = g_malloc0(sizeof(struct dev_context));
 223                 sdi->priv = devc;
 224                 devc->prof = prof;
 225                 devc->num_channels = prof->channels;
 226 #ifdef ZP_EXPERIMENTAL
 227                 devc->max_sample_depth = 128 * 1024;
 228                 devc->max_samplerate = 200;
 229 #else
 230                 devc->max_sample_depth = prof->sample_depth * 1024;
 231                 devc->max_samplerate = prof->max_sampling_freq;
 232 #endif
 233                 devc->max_samplerate *= SR_MHZ(1);
 234                 devc->memory_size = MEMORY_SIZE_8K;
 235                 // memset(devc->trigger_buffer, 0, NUM_TRIGGER_STAGES);
 236
 237                 /* Fill in channellist according to this device's profile. */
 238                 for (j = 0; j < devc->num_channels; j++)
 239                         sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE,
 240                                         channel_names[j]);
 241
 242                 devices = g_slist_append(devices, sdi);
 243                 sdi->inst_type = SR_INST_USB;
 244                 sdi->conn = sr_usb_dev_inst_new(
 245                         libusb_get_bus_number(devlist[i]),
 246                         libusb_get_device_address(devlist[i]), NULL);
 247         }
 248         libusb_free_device_list(devlist, 1);
 249
 250         return std_scan_complete(di, devices);
 251 }
 252
 253 static int dev_open(struct sr_dev_inst *sdi)
 254 {
 255         struct sr_dev_driver *di = sdi->driver;
 256         struct dev_context *devc;
 257         struct drv_context *drvc;
 258         struct sr_usb_dev_inst *usb;
 259         int ret;
 260
 261         drvc = di->context;
 262         usb = sdi->conn;
 263         devc = sdi->priv;
 264
 265         ret = sr_usb_open(drvc->sr_ctx->libusb_ctx, usb);
 266         if (ret != SR_OK)
 267                 return ret;
 268
 269         sdi->status = SR_ST_ACTIVE;
 270
 271         ret = libusb_set_configuration(usb->devhdl, USB_CONFIGURATION);
 272         if (ret < 0) {
 273                 sr_err("Unable to set USB configuration %d: %s.",
 274                        USB_CONFIGURATION, libusb_error_name(ret));
 275                 return SR_ERR;
 276         }
 277
 278         ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 279         if (ret != 0) {
 280                 sr_err("Unable to claim interface: %s.",
 281                        libusb_error_name(ret));
 282                 return SR_ERR;
 283         }
 284
 285         /* Set default configuration after power on. */
 286         if (analyzer_read_status(usb->devhdl) == 0)
 287                 analyzer_configure(usb->devhdl);
 288
 289         analyzer_reset(usb->devhdl);
 290         analyzer_initialize(usb->devhdl);
 291
 292         //analyzer_set_memory_size(MEMORY_SIZE_512K);
 293         // analyzer_set_freq(g_freq, g_freq_scale);
 294         analyzer_set_trigger_count(1);
 295         // analyzer_set_ramsize_trigger_address((((100 - g_pre_trigger)
 296         // * get_memory_size(g_memory_size)) / 100) >> 2);
 297
 298 #if 0
 299         if (g_double_mode == 1)
 300                 analyzer_set_compression(COMPRESSION_DOUBLE);
 301         else if (g_compression == 1)
 302                 analyzer_set_compression(COMPRESSION_ENABLE);
 303         else
 304 #endif
 305         analyzer_set_compression(COMPRESSION_NONE);
 306
 307         if (devc->cur_samplerate == 0) {
 308                 /* Samplerate hasn't been set. Default to 1MHz. */
 309                 analyzer_set_freq(1, FREQ_SCALE_MHZ);
 310                 devc->cur_samplerate = SR_MHZ(1);
 311         }
 312
 313         if (devc->cur_threshold == 0)
 314                 set_voltage_threshold(devc, 1.5);
 315
 316         return SR_OK;
 317 }
 318
 319 static int dev_close(struct sr_dev_inst *sdi)
 320 {
 321         struct sr_usb_dev_inst *usb;
 322
 323         usb = sdi->conn;
 324
 325         if (!usb->devhdl)
 326                 return SR_ERR;
 327
 328         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 329                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 330         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 331         libusb_reset_device(usb->devhdl);
 332         libusb_close(usb->devhdl);
 333         usb->devhdl = NULL;
 334         sdi->status = SR_ST_INACTIVE;
 335
 336         return SR_OK;
 337 }
 338
 339 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 340                 const struct sr_channel_group *cg)
 341 {
 342         struct dev_context *devc;
 343         GVariant *range[2];
 344
 345         (void)cg;
 346
 347         if (!sdi)
 348                 return SR_ERR_ARG;
 349
 350         devc = sdi->priv;
 351
 352         switch (key) {
 353         case SR_CONF_SAMPLERATE:
 354                 *data = g_variant_new_uint64(devc->cur_samplerate);
 355                 break;
 356         case SR_CONF_CAPTURE_RATIO:
 357                 *data = g_variant_new_uint64(devc->capture_ratio);
 358                 break;
 359         case SR_CONF_VOLTAGE_THRESHOLD:
 360                 range[0] = g_variant_new_double(devc->cur_threshold);
 361                 range[1] = g_variant_new_double(devc->cur_threshold);
 362                 *data = g_variant_new_tuple(range, 2);
 363                 break;
 364         default:
 365                 return SR_ERR_NA;
 366         }
 367
 368         return SR_OK;
 369 }
 370
 371 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 372                 const struct sr_channel_group *cg)
 373 {
 374         struct dev_context *devc;
 375         gdouble low, high;
 376
 377         (void)cg;
 378
 379         if (sdi->status != SR_ST_ACTIVE)
 380                 return SR_ERR_DEV_CLOSED;
 381
 382         devc = sdi->priv;
 383
 384         switch (key) {
 385         case SR_CONF_SAMPLERATE:
 386                 return zp_set_samplerate(devc, g_variant_get_uint64(data));
 387         case SR_CONF_LIMIT_SAMPLES:
 388                 return set_limit_samples(devc, g_variant_get_uint64(data));
 389         case SR_CONF_CAPTURE_RATIO:
 390                 return set_capture_ratio(devc, g_variant_get_uint64(data));
 391         case SR_CONF_VOLTAGE_THRESHOLD:
 392                 g_variant_get(data, "(dd)", &low, &high);
 393                 return set_voltage_threshold(devc, (low + high) / 2.0);
 394         default:
 395                 return SR_ERR_NA;
 396         }
 397
 398         return SR_OK;
 399 }
 400
 401 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 402                 const struct sr_channel_group *cg)
 403 {
 404         struct dev_context *devc;
 405         GVariant *gvar, *grange[2];
 406         GVariantBuilder gvb;
 407         double v;
 408         GVariant *range[2];
 409
 410         (void)cg;
 411
 412         switch (key) {
 413         case SR_CONF_DEVICE_OPTIONS:
 414                 if (!sdi) {
 415                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 416                                 drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
 417                 } else {
 418                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 419                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 420                 }
 421                 break;
 422         case SR_CONF_SAMPLERATE:
 423                 devc = sdi->priv;
 424                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 425                 if (devc->prof->max_sampling_freq == 100) {
 426                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 427                                         samplerates_100, ARRAY_SIZE(samplerates_100),
 428                                         sizeof(uint64_t));
 429                 } else if (devc->prof->max_sampling_freq == 200) {
 430                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 431                                         samplerates_200, ARRAY_SIZE(samplerates_200),
 432                                         sizeof(uint64_t));
 433                 } else {
 434                         sr_err("Internal error: Unknown max. samplerate: %d.",
 435                                devc->prof->max_sampling_freq);
 436                         return SR_ERR_ARG;
 437                 }
 438                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 439                 *data = g_variant_builder_end(&gvb);
 440                 break;
 441         case SR_CONF_TRIGGER_MATCH:
 442                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 443                                 trigger_matches, ARRAY_SIZE(trigger_matches),
 444                                 sizeof(int32_t));
 445                 break;
 446         case SR_CONF_VOLTAGE_THRESHOLD:
 447                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 448                 for (v = -6.0; v <= 6.0; v += 0.1) {
 449                         range[0] = g_variant_new_double(v);
 450                         range[1] = g_variant_new_double(v);
 451                         gvar = g_variant_new_tuple(range, 2);
 452                         g_variant_builder_add_value(&gvb, gvar);
 453                 }
 454                 *data = g_variant_builder_end(&gvb);
 455                 break;
 456         case SR_CONF_LIMIT_SAMPLES:
 457                 if (!sdi)
 458                         return SR_ERR_ARG;
 459                 devc = sdi->priv;
 460                 grange[0] = g_variant_new_uint64(0);
 461                 grange[1] = g_variant_new_uint64(devc->max_sample_depth);
 462                 *data = g_variant_new_tuple(grange, 2);
 463                 break;
 464         default:
 465                 return SR_ERR_NA;
 466         }
 467
 468         return SR_OK;
 469 }
 470
 471 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 472 {
 473         struct dev_context *devc;
 474         struct sr_usb_dev_inst *usb;
 475         struct sr_datafeed_packet packet;
 476         struct sr_datafeed_logic logic;
 477         unsigned int samples_read;
 478         int res;
 479         unsigned int packet_num, n;
 480         unsigned char *buf;
 481         unsigned int status;
 482         unsigned int stop_address;
 483         unsigned int now_address;
 484         unsigned int trigger_address;
 485         unsigned int trigger_offset;
 486         unsigned int triggerbar;
 487         unsigned int ramsize_trigger;
 488         unsigned int memory_size;
 489         unsigned int valid_samples;
 490         unsigned int discard;
 491         int trigger_now;
 492
 493         devc = sdi->priv;
 494
 495         if (analyzer_add_triggers(sdi) != SR_OK) {
 496                 sr_err("Failed to configure triggers.");
 497                 return SR_ERR;
 498         }
 499
 500         usb = sdi->conn;
 501
 502         set_triggerbar(devc);
 503
 504         /* Push configured settings to device. */
 505         analyzer_configure(usb->devhdl);
 506
 507         analyzer_start(usb->devhdl);
 508         sr_info("Waiting for data.");
 509         analyzer_wait_data(usb->devhdl);
 510
 511         status = analyzer_read_status(usb->devhdl);
 512         stop_address = analyzer_get_stop_address(usb->devhdl);
 513         now_address = analyzer_get_now_address(usb->devhdl);
 514         trigger_address = analyzer_get_trigger_address(usb->devhdl);
 515
 516         triggerbar = analyzer_get_triggerbar_address();
 517         ramsize_trigger = analyzer_get_ramsize_trigger_address();
 518
 519         n = get_memory_size(devc->memory_size);
 520         memory_size = n / 4;
 521
 522         sr_info("Status = 0x%x.", status);
 523         sr_info("Stop address       = 0x%x.", stop_address);
 524         sr_info("Now address        = 0x%x.", now_address);
 525         sr_info("Trigger address    = 0x%x.", trigger_address);
 526         sr_info("Triggerbar address = 0x%x.", triggerbar);
 527         sr_info("Ramsize trigger    = 0x%x.", ramsize_trigger);
 528         sr_info("Memory size        = 0x%x.", memory_size);
 529
 530         std_session_send_df_header(sdi);
 531
 532         /* Check for empty capture */
 533         if ((status & STATUS_READY) && !stop_address) {
 534                 std_session_send_df_end(sdi);
 535                 return SR_OK;
 536         }
 537
 538         buf = g_malloc(PACKET_SIZE);
 539
 540         /* Check if the trigger is in the samples we are throwing away */
 541         trigger_now = now_address == trigger_address ||
 542                 ((now_address + 1) % memory_size) == trigger_address;
 543
 544         /*
 545          * STATUS_READY doesn't clear until now_address advances past
 546          * addr 0, but for our logic, clear it in that case
 547          */
 548         if (!now_address)
 549                 status &= ~STATUS_READY;
 550
 551         analyzer_read_start(usb->devhdl);
 552
 553         /* Calculate how much data to discard */
 554         discard = 0;
 555         if (status & STATUS_READY) {
 556                 /*
 557                  * We haven't wrapped around, we need to throw away data from
 558                  * our current position to the end of the buffer.
 559                  * Additionally, the first two samples captured are always
 560                  * bogus.
 561                  */
 562                 discard += memory_size - now_address + 2;
 563                 now_address = 2;
 564         }
 565
 566         /* If we have more samples than we need, discard them */
 567         valid_samples = (stop_address - now_address) % memory_size;
 568         if (valid_samples > ramsize_trigger + triggerbar) {
 569                 discard += valid_samples - (ramsize_trigger + triggerbar);
 570                 now_address += valid_samples - (ramsize_trigger + triggerbar);
 571         }
 572
 573         sr_info("Need to discard %d samples.", discard);
 574
 575         /* Calculate how far in the trigger is */
 576         if (trigger_now)
 577                 trigger_offset = 0;
 578         else
 579                 trigger_offset = (trigger_address - now_address) % memory_size;
 580
 581         /* Recalculate the number of samples available */
 582         valid_samples = (stop_address - now_address) % memory_size;
 583
 584         /* Send the incoming transfer to the session bus. */
 585         samples_read = 0;
 586         for (packet_num = 0; packet_num < n / PACKET_SIZE; packet_num++) {
 587                 unsigned int len;
 588                 unsigned int buf_offset;
 589
 590                 res = analyzer_read_data(usb->devhdl, buf, PACKET_SIZE);
 591                 sr_info("Tried to read %d bytes, actually read %d bytes.",
 592                         PACKET_SIZE, res);
 593
 594                 if (discard >= PACKET_SIZE / 4) {
 595                         discard -= PACKET_SIZE / 4;
 596                         continue;
 597                 }
 598
 599                 len = PACKET_SIZE - discard * 4;
 600                 buf_offset = discard * 4;
 601                 discard = 0;
 602
 603                 /* Check if we've read all the samples */
 604                 if (samples_read + len / 4 >= valid_samples)
 605                         len = (valid_samples - samples_read) * 4;
 606                 if (!len)
 607                         break;
 608
 609                 if (samples_read < trigger_offset &&
 610                     samples_read + len / 4 > trigger_offset) {
 611                         /* Send out samples remaining before trigger */
 612                         packet.type = SR_DF_LOGIC;
 613                         packet.payload = &logic;
 614                         logic.length = (trigger_offset - samples_read) * 4;
 615                         logic.unitsize = 4;
 616                         logic.data = buf + buf_offset;
 617                         sr_session_send(sdi, &packet);
 618                         len -= logic.length;
 619                         samples_read += logic.length / 4;
 620                         buf_offset += logic.length;
 621                 }
 622
 623                 if (samples_read == trigger_offset) {
 624                         /* Send out trigger */
 625                         packet.type = SR_DF_TRIGGER;
 626                         packet.payload = NULL;
 627                         sr_session_send(sdi, &packet);
 628                 }
 629
 630                 /* Send out data (or data after trigger) */
 631                 packet.type = SR_DF_LOGIC;
 632                 packet.payload = &logic;
 633                 logic.length = len;
 634                 logic.unitsize = 4;
 635                 logic.data = buf + buf_offset;
 636                 sr_session_send(sdi, &packet);
 637                 samples_read += len / 4;
 638         }
 639         analyzer_read_stop(usb->devhdl);
 640         g_free(buf);
 641
 642         std_session_send_df_end(sdi);
 643
 644         return SR_OK;
 645 }
 646
 647 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 648 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 649 {
 650         struct sr_usb_dev_inst *usb;
 651
 652         std_session_send_df_end(sdi);
 653
 654         usb = sdi->conn;
 655         analyzer_reset(usb->devhdl);
 656         /* TODO: Need to cancel and free any queued up transfers. */
 657
 658         return SR_OK;
 659 }
 660
 661 static struct sr_dev_driver zeroplus_logic_cube_driver_info = {
 662         .name = "zeroplus-logic-cube",
 663         .longname = "ZEROPLUS Logic Cube LAP-C series",
 664         .api_version = 1,
 665         .init = std_init,
 666         .cleanup = std_cleanup,
 667         .scan = scan,
 668         .dev_list = std_dev_list,
 669         .dev_clear = NULL,
 670         .config_get = config_get,
 671         .config_set = config_set,
 672         .config_list = config_list,
 673         .dev_open = dev_open,
 674         .dev_close = dev_close,
 675         .dev_acquisition_start = dev_acquisition_start,
 676         .dev_acquisition_stop = dev_acquisition_stop,
 677         .context = NULL,
 678 };
 679 SR_REGISTER_DEV_DRIVER(zeroplus_logic_cube_driver_info);