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 devopts[] = {
  58         SR_CONF_LOGIC_ANALYZER,
  59         SR_CONF_LIMIT_SAMPLES | SR_CONF_SET | SR_CONF_LIST,
  60         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  61         SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
  62         SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
  63         SR_CONF_VOLTAGE_THRESHOLD | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  64 };
  65
  66 static const int32_t trigger_matches[] = {
  67         SR_TRIGGER_ZERO,
  68         SR_TRIGGER_ONE,
  69 };
  70
  71 /*
  72  * ZEROPLUS LAP-C (16032) numbers the 16 channels A0-A7 and B0-B7.
  73  * We currently ignore other untested/unsupported devices here.
  74  */
  75 static const char *channel_names[] = {
  76         "A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7",
  77         "B0", "B1", "B2", "B3", "B4", "B5", "B6", "B7",
  78         "C0", "C1", "C2", "C3", "C4", "C5", "C6", "C7",
  79         "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",
  80 };
  81
  82 SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info;
  83
  84 /*
  85  * The hardware supports more samplerates than these, but these are the
  86  * options hardcoded into the vendor's Windows GUI.
  87  */
  88
  89 static const uint64_t samplerates_100[] = {
  90         SR_HZ(100),
  91         SR_HZ(500),
  92         SR_KHZ(1),
  93         SR_KHZ(5),
  94         SR_KHZ(25),
  95         SR_KHZ(50),
  96         SR_KHZ(100),
  97         SR_KHZ(200),
  98         SR_KHZ(400),
  99         SR_KHZ(800),
 100         SR_MHZ(1),
 101         SR_MHZ(10),
 102         SR_MHZ(25),
 103         SR_MHZ(50),
 104         SR_MHZ(80),
 105         SR_MHZ(100),
 106 };
 107
 108 const uint64_t samplerates_200[] = {
 109         SR_HZ(100),
 110         SR_HZ(500),
 111         SR_KHZ(1),
 112         SR_KHZ(5),
 113         SR_KHZ(25),
 114         SR_KHZ(50),
 115         SR_KHZ(100),
 116         SR_KHZ(200),
 117         SR_KHZ(400),
 118         SR_KHZ(800),
 119         SR_MHZ(1),
 120         SR_MHZ(10),
 121         SR_MHZ(25),
 122         SR_MHZ(50),
 123         SR_MHZ(80),
 124         SR_MHZ(100),
 125         SR_MHZ(150),
 126         SR_MHZ(200),
 127 };
 128
 129 static int dev_close(struct sr_dev_inst *sdi);
 130
 131 SR_PRIV int zp_set_samplerate(struct dev_context *devc, uint64_t samplerate)
 132 {
 133         int i;
 134
 135         for (i = 0; ARRAY_SIZE(samplerates_200); i++)
 136                 if (samplerate == samplerates_200[i])
 137                         break;
 138
 139         if (i == ARRAY_SIZE(samplerates_200) || samplerate > devc->max_samplerate) {
 140                 sr_err("Unsupported samplerate: %" PRIu64 "Hz.", samplerate);
 141                 return SR_ERR_ARG;
 142         }
 143
 144         sr_info("Setting samplerate to %" PRIu64 "Hz.", samplerate);
 145
 146         if (samplerate >= SR_MHZ(1))
 147                 analyzer_set_freq(samplerate / SR_MHZ(1), FREQ_SCALE_MHZ);
 148         else if (samplerate >= SR_KHZ(1))
 149                 analyzer_set_freq(samplerate / SR_KHZ(1), FREQ_SCALE_KHZ);
 150         else
 151                 analyzer_set_freq(samplerate, FREQ_SCALE_HZ);
 152
 153         devc->cur_samplerate = samplerate;
 154
 155         return SR_OK;
 156 }
 157
 158 static int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
 159 {
 160         return std_init(sr_ctx, di, LOG_PREFIX);
 161 }
 162
 163 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 164 {
 165         struct sr_dev_inst *sdi;
 166         struct drv_context *drvc;
 167         struct dev_context *devc;
 168         const struct zp_model *prof;
 169         struct libusb_device_descriptor des;
 170         struct libusb_device_handle *hdl;
 171         libusb_device **devlist;
 172         GSList *devices;
 173         int ret, i, j;
 174         char serial_num[64], connection_id[64];
 175
 176         (void)options;
 177
 178         drvc = di->context;
 179
 180         devices = NULL;
 181
 182         /* Find all ZEROPLUS analyzers and add them to device list. */
 183         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist); /* TODO: Errors. */
 184
 185         for (i = 0; devlist[i]; i++) {
 186                 libusb_get_device_descriptor(devlist[i], &des);
 187
 188                 if ((ret = libusb_open(devlist[i], &hdl)) < 0)
 189                         continue;
 190
 191                 if (des.iSerialNumber == 0) {
 192                         serial_num[0] = '\0';
 193                 } else if ((ret = libusb_get_string_descriptor_ascii(hdl,
 194                                 des.iSerialNumber, (unsigned char *) serial_num,
 195                                 sizeof(serial_num))) < 0) {
 196                         sr_warn("Failed to get serial number string descriptor: %s.",
 197                                 libusb_error_name(ret));
 198                         continue;
 199                 }
 200
 201                 libusb_close(hdl);
 202
 203                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 204
 205                 prof = NULL;
 206                 for (j = 0; j < zeroplus_models[j].vid; j++) {
 207                         if (des.idVendor == zeroplus_models[j].vid &&
 208                                 des.idProduct == zeroplus_models[j].pid) {
 209                                 prof = &zeroplus_models[j];
 210                         }
 211                 }
 212                 /* Skip if the device was not found. */
 213                 if (!prof)
 214                         continue;
 215                 sr_info("Found ZEROPLUS %s.", prof->model_name);
 216
 217                 /* Register the device with libsigrok. */
 218                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 219                 sdi->status = SR_ST_INACTIVE;
 220                 sdi->vendor = g_strdup(VENDOR_NAME);
 221                 sdi->model = g_strdup(prof->model_name);
 222                 sdi->driver = di;
 223                 sdi->serial_num = g_strdup(serial_num);
 224                 sdi->connection_id = g_strdup(connection_id);
 225
 226                 /* Allocate memory for our private driver context. */
 227                 devc = g_malloc0(sizeof(struct dev_context));
 228                 sdi->priv = devc;
 229                 devc->prof = prof;
 230                 devc->num_channels = prof->channels;
 231 #ifdef ZP_EXPERIMENTAL
 232                 devc->max_sample_depth = 128 * 1024;
 233                 devc->max_samplerate = 200;
 234 #else
 235                 devc->max_sample_depth = prof->sample_depth * 1024;
 236                 devc->max_samplerate = prof->max_sampling_freq;
 237 #endif
 238                 devc->max_samplerate *= SR_MHZ(1);
 239                 devc->memory_size = MEMORY_SIZE_8K;
 240                 // memset(devc->trigger_buffer, 0, NUM_TRIGGER_STAGES);
 241
 242                 /* Fill in channellist according to this device's profile. */
 243                 for (j = 0; j < devc->num_channels; j++)
 244                         sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE,
 245                                         channel_names[j]);
 246
 247                 devices = g_slist_append(devices, sdi);
 248                 drvc->instances = g_slist_append(drvc->instances, sdi);
 249                 sdi->inst_type = SR_INST_USB;
 250                 sdi->conn = sr_usb_dev_inst_new(
 251                         libusb_get_bus_number(devlist[i]),
 252                         libusb_get_device_address(devlist[i]), NULL);
 253         }
 254         libusb_free_device_list(devlist, 1);
 255
 256         return devices;
 257 }
 258
 259 static GSList *dev_list(const struct sr_dev_driver *di)
 260 {
 261         return ((struct drv_context *)(di->context))->instances;
 262 }
 263
 264 static int dev_open(struct sr_dev_inst *sdi)
 265 {
 266         struct sr_dev_driver *di = sdi->driver;
 267         struct dev_context *devc;
 268         struct drv_context *drvc;
 269         struct sr_usb_dev_inst *usb;
 270         libusb_device **devlist, *dev;
 271         int device_count, ret, i;
 272         char connection_id[64];
 273
 274         drvc = di->context;
 275         usb = sdi->conn;
 276
 277         if (!(devc = sdi->priv)) {
 278                 sr_err("%s: sdi->priv was NULL", __func__);
 279                 return SR_ERR_ARG;
 280         }
 281
 282         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx,
 283                                               &devlist);
 284         if (device_count < 0) {
 285                 sr_err("Failed to retrieve device list.");
 286                 return SR_ERR;
 287         }
 288
 289         dev = NULL;
 290         for (i = 0; i < device_count; i++) {
 291                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 292                 if (!strcmp(sdi->connection_id, connection_id)) {
 293                         dev = devlist[i];
 294                         break;
 295                 }
 296         }
 297         if (!dev) {
 298                 sr_err("Device on %d.%d (logical) / %s (physical) disappeared!",
 299                        usb->bus, usb->address, sdi->connection_id);
 300                 return SR_ERR;
 301         }
 302
 303         if (!(ret = libusb_open(dev, &(usb->devhdl)))) {
 304                 sdi->status = SR_ST_ACTIVE;
 305                 sr_info("Opened device on %d.%d (logical) / %s (physical) interface %d.",
 306                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 307         } else {
 308                 sr_err("Failed to open device: %s.", libusb_error_name(ret));
 309                 return SR_ERR;
 310         }
 311
 312         ret = libusb_set_configuration(usb->devhdl, USB_CONFIGURATION);
 313         if (ret < 0) {
 314                 sr_err("Unable to set USB configuration %d: %s.",
 315                        USB_CONFIGURATION, libusb_error_name(ret));
 316                 return SR_ERR;
 317         }
 318
 319         ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 320         if (ret != 0) {
 321                 sr_err("Unable to claim interface: %s.",
 322                        libusb_error_name(ret));
 323                 return SR_ERR;
 324         }
 325
 326         /* Set default configuration after power on. */
 327         if (analyzer_read_status(usb->devhdl) == 0)
 328                 analyzer_configure(usb->devhdl);
 329
 330         analyzer_reset(usb->devhdl);
 331         analyzer_initialize(usb->devhdl);
 332
 333         //analyzer_set_memory_size(MEMORY_SIZE_512K);
 334         // analyzer_set_freq(g_freq, g_freq_scale);
 335         analyzer_set_trigger_count(1);
 336         // analyzer_set_ramsize_trigger_address((((100 - g_pre_trigger)
 337         // * get_memory_size(g_memory_size)) / 100) >> 2);
 338
 339 #if 0
 340         if (g_double_mode == 1)
 341                 analyzer_set_compression(COMPRESSION_DOUBLE);
 342         else if (g_compression == 1)
 343                 analyzer_set_compression(COMPRESSION_ENABLE);
 344         else
 345 #endif
 346         analyzer_set_compression(COMPRESSION_NONE);
 347
 348         if (devc->cur_samplerate == 0) {
 349                 /* Samplerate hasn't been set. Default to 1MHz. */
 350                 analyzer_set_freq(1, FREQ_SCALE_MHZ);
 351                 devc->cur_samplerate = SR_MHZ(1);
 352         }
 353
 354         if (devc->cur_threshold == 0)
 355                 set_voltage_threshold(devc, 1.5);
 356
 357         return SR_OK;
 358 }
 359
 360 static int dev_close(struct sr_dev_inst *sdi)
 361 {
 362         struct sr_usb_dev_inst *usb;
 363
 364         usb = sdi->conn;
 365
 366         if (!usb->devhdl)
 367                 return SR_ERR;
 368
 369         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 370                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 371         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 372         libusb_reset_device(usb->devhdl);
 373         libusb_close(usb->devhdl);
 374         usb->devhdl = NULL;
 375         sdi->status = SR_ST_INACTIVE;
 376
 377         return SR_OK;
 378 }
 379
 380 static int cleanup(const struct sr_dev_driver *di)
 381 {
 382         return std_dev_clear(di, NULL);
 383 }
 384
 385 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 386                 const struct sr_channel_group *cg)
 387 {
 388         struct dev_context *devc;
 389         GVariant *range[2];
 390
 391         (void)cg;
 392
 393         if (!sdi)
 394                 return SR_ERR_ARG;
 395
 396         devc = sdi->priv;
 397
 398         switch (key) {
 399         case SR_CONF_SAMPLERATE:
 400                 *data = g_variant_new_uint64(devc->cur_samplerate);
 401                 break;
 402         case SR_CONF_CAPTURE_RATIO:
 403                 *data = g_variant_new_uint64(devc->capture_ratio);
 404                 break;
 405         case SR_CONF_VOLTAGE_THRESHOLD:
 406                 range[0] = g_variant_new_double(devc->cur_threshold);
 407                 range[1] = g_variant_new_double(devc->cur_threshold);
 408                 *data = g_variant_new_tuple(range, 2);
 409                 break;
 410         default:
 411                 return SR_ERR_NA;
 412         }
 413
 414         return SR_OK;
 415 }
 416
 417 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 418                 const struct sr_channel_group *cg)
 419 {
 420         struct dev_context *devc;
 421         gdouble low, high;
 422
 423         (void)cg;
 424
 425         if (sdi->status != SR_ST_ACTIVE)
 426                 return SR_ERR_DEV_CLOSED;
 427
 428         if (!(devc = sdi->priv)) {
 429                 sr_err("%s: sdi->priv was NULL", __func__);
 430                 return SR_ERR_ARG;
 431         }
 432
 433         switch (key) {
 434         case SR_CONF_SAMPLERATE:
 435                 return zp_set_samplerate(devc, g_variant_get_uint64(data));
 436         case SR_CONF_LIMIT_SAMPLES:
 437                 return set_limit_samples(devc, g_variant_get_uint64(data));
 438         case SR_CONF_CAPTURE_RATIO:
 439                 return set_capture_ratio(devc, g_variant_get_uint64(data));
 440         case SR_CONF_VOLTAGE_THRESHOLD:
 441                 g_variant_get(data, "(dd)", &low, &high);
 442                 return set_voltage_threshold(devc, (low + high) / 2.0);
 443         default:
 444                 return SR_ERR_NA;
 445         }
 446
 447         return SR_OK;
 448 }
 449
 450 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 451                 const struct sr_channel_group *cg)
 452 {
 453         struct dev_context *devc;
 454         GVariant *gvar, *grange[2];
 455         GVariantBuilder gvb;
 456         double v;
 457         GVariant *range[2];
 458
 459         (void)cg;
 460
 461         switch (key) {
 462         case SR_CONF_DEVICE_OPTIONS:
 463                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 464                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 465                 break;
 466         case SR_CONF_SAMPLERATE:
 467                 devc = sdi->priv;
 468                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 469                 if (devc->prof->max_sampling_freq == 100) {
 470                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 471                                         samplerates_100, ARRAY_SIZE(samplerates_100),
 472                                         sizeof(uint64_t));
 473                 } else if (devc->prof->max_sampling_freq == 200) {
 474                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 475                                         samplerates_200, ARRAY_SIZE(samplerates_200),
 476                                         sizeof(uint64_t));
 477                 } else {
 478                         sr_err("Internal error: Unknown max. samplerate: %d.",
 479                                devc->prof->max_sampling_freq);
 480                         return SR_ERR_ARG;
 481                 }
 482                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 483                 *data = g_variant_builder_end(&gvb);
 484                 break;
 485         case SR_CONF_TRIGGER_MATCH:
 486                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 487                                 trigger_matches, ARRAY_SIZE(trigger_matches),
 488                                 sizeof(int32_t));
 489                 break;
 490         case SR_CONF_VOLTAGE_THRESHOLD:
 491                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 492                 for (v = -6.0; v <= 6.0; v += 0.1) {
 493                         range[0] = g_variant_new_double(v);
 494                         range[1] = g_variant_new_double(v);
 495                         gvar = g_variant_new_tuple(range, 2);
 496                         g_variant_builder_add_value(&gvb, gvar);
 497                 }
 498                 *data = g_variant_builder_end(&gvb);
 499                 break;
 500         case SR_CONF_LIMIT_SAMPLES:
 501                 if (!sdi)
 502                         return SR_ERR_ARG;
 503                 devc = sdi->priv;
 504                 grange[0] = g_variant_new_uint64(0);
 505                 grange[1] = g_variant_new_uint64(devc->max_sample_depth);
 506                 *data = g_variant_new_tuple(grange, 2);
 507                 break;
 508         default:
 509                 return SR_ERR_NA;
 510         }
 511
 512         return SR_OK;
 513 }
 514
 515 static int dev_acquisition_start(const struct sr_dev_inst *sdi,
 516                 void *cb_data)
 517 {
 518         struct dev_context *devc;
 519         struct sr_usb_dev_inst *usb;
 520         struct sr_datafeed_packet packet;
 521         struct sr_datafeed_logic logic;
 522         unsigned int samples_read;
 523         int res;
 524         unsigned int packet_num, n;
 525         unsigned char *buf;
 526         unsigned int status;
 527         unsigned int stop_address;
 528         unsigned int now_address;
 529         unsigned int trigger_address;
 530         unsigned int trigger_offset;
 531         unsigned int triggerbar;
 532         unsigned int ramsize_trigger;
 533         unsigned int memory_size;
 534         unsigned int valid_samples;
 535         unsigned int discard;
 536         int trigger_now;
 537
 538         if (sdi->status != SR_ST_ACTIVE)
 539                 return SR_ERR_DEV_CLOSED;
 540
 541         if (!(devc = sdi->priv)) {
 542                 sr_err("%s: sdi->priv was NULL", __func__);
 543                 return SR_ERR_ARG;
 544         }
 545
 546         if (analyzer_add_triggers(sdi) != SR_OK) {
 547                 sr_err("Failed to configure triggers.");
 548                 return SR_ERR;
 549         }
 550
 551         usb = sdi->conn;
 552
 553         set_triggerbar(devc);
 554
 555         /* Push configured settings to device. */
 556         analyzer_configure(usb->devhdl);
 557
 558         analyzer_start(usb->devhdl);
 559         sr_info("Waiting for data.");
 560         analyzer_wait_data(usb->devhdl);
 561
 562         status = analyzer_read_status(usb->devhdl);
 563         stop_address = analyzer_get_stop_address(usb->devhdl);
 564         now_address = analyzer_get_now_address(usb->devhdl);
 565         trigger_address = analyzer_get_trigger_address(usb->devhdl);
 566
 567         triggerbar = analyzer_get_triggerbar_address();
 568         ramsize_trigger = analyzer_get_ramsize_trigger_address();
 569
 570         n = get_memory_size(devc->memory_size);
 571         memory_size = n / 4;
 572
 573         sr_info("Status = 0x%x.", status);
 574         sr_info("Stop address       = 0x%x.", stop_address);
 575         sr_info("Now address        = 0x%x.", now_address);
 576         sr_info("Trigger address    = 0x%x.", trigger_address);
 577         sr_info("Triggerbar address = 0x%x.", triggerbar);
 578         sr_info("Ramsize trigger    = 0x%x.", ramsize_trigger);
 579         sr_info("Memory size        = 0x%x.", memory_size);
 580
 581         std_session_send_df_header(cb_data, LOG_PREFIX);
 582
 583         /* Check for empty capture */
 584         if ((status & STATUS_READY) && !stop_address) {
 585                 std_session_send_df_end(cb_data, LOG_PREFIX);
 586                 return SR_OK;
 587         }
 588
 589         buf = g_malloc(PACKET_SIZE);
 590
 591         /* Check if the trigger is in the samples we are throwing away */
 592         trigger_now = now_address == trigger_address ||
 593                 ((now_address + 1) % memory_size) == trigger_address;
 594
 595         /*
 596          * STATUS_READY doesn't clear until now_address advances past
 597          * addr 0, but for our logic, clear it in that case
 598          */
 599         if (!now_address)
 600                 status &= ~STATUS_READY;
 601
 602         analyzer_read_start(usb->devhdl);
 603
 604         /* Calculate how much data to discard */
 605         discard = 0;
 606         if (status & STATUS_READY) {
 607                 /*
 608                  * We haven't wrapped around, we need to throw away data from
 609                  * our current position to the end of the buffer.
 610                  * Additionally, the first two samples captured are always
 611                  * bogus.
 612                  */
 613                 discard += memory_size - now_address + 2;
 614                 now_address = 2;
 615         }
 616
 617         /* If we have more samples than we need, discard them */
 618         valid_samples = (stop_address - now_address) % memory_size;
 619         if (valid_samples > ramsize_trigger + triggerbar) {
 620                 discard += valid_samples - (ramsize_trigger + triggerbar);
 621                 now_address += valid_samples - (ramsize_trigger + triggerbar);
 622         }
 623
 624         sr_info("Need to discard %d samples.", discard);
 625
 626         /* Calculate how far in the trigger is */
 627         if (trigger_now)
 628                 trigger_offset = 0;
 629         else
 630                 trigger_offset = (trigger_address - now_address) % memory_size;
 631
 632         /* Recalculate the number of samples available */
 633         valid_samples = (stop_address - now_address) % memory_size;
 634
 635         /* Send the incoming transfer to the session bus. */
 636         samples_read = 0;
 637         for (packet_num = 0; packet_num < n / PACKET_SIZE; packet_num++) {
 638                 unsigned int len;
 639                 unsigned int buf_offset;
 640
 641                 res = analyzer_read_data(usb->devhdl, buf, PACKET_SIZE);
 642                 sr_info("Tried to read %d bytes, actually read %d bytes.",
 643                         PACKET_SIZE, res);
 644
 645                 if (discard >= PACKET_SIZE / 4) {
 646                         discard -= PACKET_SIZE / 4;
 647                         continue;
 648                 }
 649
 650                 len = PACKET_SIZE - discard * 4;
 651                 buf_offset = discard * 4;
 652                 discard = 0;
 653
 654                 /* Check if we've read all the samples */
 655                 if (samples_read + len / 4 >= valid_samples)
 656                         len = (valid_samples - samples_read) * 4;
 657                 if (!len)
 658                         break;
 659
 660                 if (samples_read < trigger_offset &&
 661                     samples_read + len / 4 > trigger_offset) {
 662                         /* Send out samples remaining before trigger */
 663                         packet.type = SR_DF_LOGIC;
 664                         packet.payload = &logic;
 665                         logic.length = (trigger_offset - samples_read) * 4;
 666                         logic.unitsize = 4;
 667                         logic.data = buf + buf_offset;
 668                         sr_session_send(cb_data, &packet);
 669                         len -= logic.length;
 670                         samples_read += logic.length / 4;
 671                         buf_offset += logic.length;
 672                 }
 673
 674                 if (samples_read == trigger_offset) {
 675                         /* Send out trigger */
 676                         packet.type = SR_DF_TRIGGER;
 677                         packet.payload = NULL;
 678                         sr_session_send(cb_data, &packet);
 679                 }
 680
 681                 /* Send out data (or data after trigger) */
 682                 packet.type = SR_DF_LOGIC;
 683                 packet.payload = &logic;
 684                 logic.length = len;
 685                 logic.unitsize = 4;
 686                 logic.data = buf + buf_offset;
 687                 sr_session_send(cb_data, &packet);
 688                 samples_read += len / 4;
 689         }
 690         analyzer_read_stop(usb->devhdl);
 691         g_free(buf);
 692
 693         std_session_send_df_end(cb_data, LOG_PREFIX);
 694
 695         return SR_OK;
 696 }
 697
 698 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 699 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 700 {
 701         struct dev_context *devc;
 702         struct sr_usb_dev_inst *usb;
 703
 704         std_session_send_df_end(cb_data, LOG_PREFIX);
 705
 706         if (!(devc = sdi->priv)) {
 707                 sr_err("%s: sdi->priv was NULL", __func__);
 708                 return SR_ERR_BUG;
 709         }
 710
 711         usb = sdi->conn;
 712         analyzer_reset(usb->devhdl);
 713         /* TODO: Need to cancel and free any queued up transfers. */
 714
 715         return SR_OK;
 716 }
 717
 718 SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info = {
 719         .name = "zeroplus-logic-cube",
 720         .longname = "ZEROPLUS Logic Cube LAP-C series",
 721         .api_version = 1,
 722         .init = init,
 723         .cleanup = cleanup,
 724         .scan = scan,
 725         .dev_list = dev_list,
 726         .dev_clear = NULL,
 727         .config_get = config_get,
 728         .config_set = config_set,
 729         .config_list = config_list,
 730         .dev_open = dev_open,
 731         .dev_close = dev_close,
 732         .dev_acquisition_start = dev_acquisition_start,
 733         .dev_acquisition_stop = dev_acquisition_stop,
 734         .context = NULL,
 735 };