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 int dev_open(struct sr_dev_inst *sdi)
 260 {
 261         struct sr_dev_driver *di = sdi->driver;
 262         struct dev_context *devc;
 263         struct drv_context *drvc;
 264         struct sr_usb_dev_inst *usb;
 265         libusb_device **devlist, *dev;
 266         int device_count, ret, i;
 267         char connection_id[64];
 268
 269         drvc = di->context;
 270         usb = sdi->conn;
 271         devc = sdi->priv;
 272
 273         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx,
 274                                               &devlist);
 275         if (device_count < 0) {
 276                 sr_err("Failed to retrieve device list.");
 277                 return SR_ERR;
 278         }
 279
 280         dev = NULL;
 281         for (i = 0; i < device_count; i++) {
 282                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 283                 if (!strcmp(sdi->connection_id, connection_id)) {
 284                         dev = devlist[i];
 285                         break;
 286                 }
 287         }
 288         if (!dev) {
 289                 sr_err("Device on %d.%d (logical) / %s (physical) disappeared!",
 290                        usb->bus, usb->address, sdi->connection_id);
 291                 return SR_ERR;
 292         }
 293
 294         if (!(ret = libusb_open(dev, &(usb->devhdl)))) {
 295                 sdi->status = SR_ST_ACTIVE;
 296                 sr_info("Opened device on %d.%d (logical) / %s (physical) interface %d.",
 297                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 298         } else {
 299                 sr_err("Failed to open device: %s.", libusb_error_name(ret));
 300                 return SR_ERR;
 301         }
 302
 303         ret = libusb_set_configuration(usb->devhdl, USB_CONFIGURATION);
 304         if (ret < 0) {
 305                 sr_err("Unable to set USB configuration %d: %s.",
 306                        USB_CONFIGURATION, libusb_error_name(ret));
 307                 return SR_ERR;
 308         }
 309
 310         ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 311         if (ret != 0) {
 312                 sr_err("Unable to claim interface: %s.",
 313                        libusb_error_name(ret));
 314                 return SR_ERR;
 315         }
 316
 317         /* Set default configuration after power on. */
 318         if (analyzer_read_status(usb->devhdl) == 0)
 319                 analyzer_configure(usb->devhdl);
 320
 321         analyzer_reset(usb->devhdl);
 322         analyzer_initialize(usb->devhdl);
 323
 324         //analyzer_set_memory_size(MEMORY_SIZE_512K);
 325         // analyzer_set_freq(g_freq, g_freq_scale);
 326         analyzer_set_trigger_count(1);
 327         // analyzer_set_ramsize_trigger_address((((100 - g_pre_trigger)
 328         // * get_memory_size(g_memory_size)) / 100) >> 2);
 329
 330 #if 0
 331         if (g_double_mode == 1)
 332                 analyzer_set_compression(COMPRESSION_DOUBLE);
 333         else if (g_compression == 1)
 334                 analyzer_set_compression(COMPRESSION_ENABLE);
 335         else
 336 #endif
 337         analyzer_set_compression(COMPRESSION_NONE);
 338
 339         if (devc->cur_samplerate == 0) {
 340                 /* Samplerate hasn't been set. Default to 1MHz. */
 341                 analyzer_set_freq(1, FREQ_SCALE_MHZ);
 342                 devc->cur_samplerate = SR_MHZ(1);
 343         }
 344
 345         if (devc->cur_threshold == 0)
 346                 set_voltage_threshold(devc, 1.5);
 347
 348         return SR_OK;
 349 }
 350
 351 static int dev_close(struct sr_dev_inst *sdi)
 352 {
 353         struct sr_usb_dev_inst *usb;
 354
 355         usb = sdi->conn;
 356
 357         if (!usb->devhdl)
 358                 return SR_ERR;
 359
 360         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 361                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 362         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 363         libusb_reset_device(usb->devhdl);
 364         libusb_close(usb->devhdl);
 365         usb->devhdl = NULL;
 366         sdi->status = SR_ST_INACTIVE;
 367
 368         return SR_OK;
 369 }
 370
 371 static int config_get(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         GVariant *range[2];
 376
 377         (void)cg;
 378
 379         if (!sdi)
 380                 return SR_ERR_ARG;
 381
 382         devc = sdi->priv;
 383
 384         switch (key) {
 385         case SR_CONF_SAMPLERATE:
 386                 *data = g_variant_new_uint64(devc->cur_samplerate);
 387                 break;
 388         case SR_CONF_CAPTURE_RATIO:
 389                 *data = g_variant_new_uint64(devc->capture_ratio);
 390                 break;
 391         case SR_CONF_VOLTAGE_THRESHOLD:
 392                 range[0] = g_variant_new_double(devc->cur_threshold);
 393                 range[1] = g_variant_new_double(devc->cur_threshold);
 394                 *data = g_variant_new_tuple(range, 2);
 395                 break;
 396         default:
 397                 return SR_ERR_NA;
 398         }
 399
 400         return SR_OK;
 401 }
 402
 403 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 404                 const struct sr_channel_group *cg)
 405 {
 406         struct dev_context *devc;
 407         gdouble low, high;
 408
 409         (void)cg;
 410
 411         if (sdi->status != SR_ST_ACTIVE)
 412                 return SR_ERR_DEV_CLOSED;
 413
 414         if (!(devc = sdi->priv)) {
 415                 sr_err("%s: sdi->priv was NULL", __func__);
 416                 return SR_ERR_ARG;
 417         }
 418
 419         switch (key) {
 420         case SR_CONF_SAMPLERATE:
 421                 return zp_set_samplerate(devc, g_variant_get_uint64(data));
 422         case SR_CONF_LIMIT_SAMPLES:
 423                 return set_limit_samples(devc, g_variant_get_uint64(data));
 424         case SR_CONF_CAPTURE_RATIO:
 425                 return set_capture_ratio(devc, g_variant_get_uint64(data));
 426         case SR_CONF_VOLTAGE_THRESHOLD:
 427                 g_variant_get(data, "(dd)", &low, &high);
 428                 return set_voltage_threshold(devc, (low + high) / 2.0);
 429         default:
 430                 return SR_ERR_NA;
 431         }
 432
 433         return SR_OK;
 434 }
 435
 436 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 437                 const struct sr_channel_group *cg)
 438 {
 439         struct dev_context *devc;
 440         GVariant *gvar, *grange[2];
 441         GVariantBuilder gvb;
 442         double v;
 443         GVariant *range[2];
 444
 445         (void)cg;
 446
 447         switch (key) {
 448         case SR_CONF_DEVICE_OPTIONS:
 449                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 450                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 451                 break;
 452         case SR_CONF_SAMPLERATE:
 453                 devc = sdi->priv;
 454                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 455                 if (devc->prof->max_sampling_freq == 100) {
 456                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 457                                         samplerates_100, ARRAY_SIZE(samplerates_100),
 458                                         sizeof(uint64_t));
 459                 } else if (devc->prof->max_sampling_freq == 200) {
 460                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 461                                         samplerates_200, ARRAY_SIZE(samplerates_200),
 462                                         sizeof(uint64_t));
 463                 } else {
 464                         sr_err("Internal error: Unknown max. samplerate: %d.",
 465                                devc->prof->max_sampling_freq);
 466                         return SR_ERR_ARG;
 467                 }
 468                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 469                 *data = g_variant_builder_end(&gvb);
 470                 break;
 471         case SR_CONF_TRIGGER_MATCH:
 472                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 473                                 trigger_matches, ARRAY_SIZE(trigger_matches),
 474                                 sizeof(int32_t));
 475                 break;
 476         case SR_CONF_VOLTAGE_THRESHOLD:
 477                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 478                 for (v = -6.0; v <= 6.0; v += 0.1) {
 479                         range[0] = g_variant_new_double(v);
 480                         range[1] = g_variant_new_double(v);
 481                         gvar = g_variant_new_tuple(range, 2);
 482                         g_variant_builder_add_value(&gvb, gvar);
 483                 }
 484                 *data = g_variant_builder_end(&gvb);
 485                 break;
 486         case SR_CONF_LIMIT_SAMPLES:
 487                 if (!sdi)
 488                         return SR_ERR_ARG;
 489                 devc = sdi->priv;
 490                 grange[0] = g_variant_new_uint64(0);
 491                 grange[1] = g_variant_new_uint64(devc->max_sample_depth);
 492                 *data = g_variant_new_tuple(grange, 2);
 493                 break;
 494         default:
 495                 return SR_ERR_NA;
 496         }
 497
 498         return SR_OK;
 499 }
 500
 501 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 502 {
 503         struct dev_context *devc;
 504         struct sr_usb_dev_inst *usb;
 505         struct sr_datafeed_packet packet;
 506         struct sr_datafeed_logic logic;
 507         unsigned int samples_read;
 508         int res;
 509         unsigned int packet_num, n;
 510         unsigned char *buf;
 511         unsigned int status;
 512         unsigned int stop_address;
 513         unsigned int now_address;
 514         unsigned int trigger_address;
 515         unsigned int trigger_offset;
 516         unsigned int triggerbar;
 517         unsigned int ramsize_trigger;
 518         unsigned int memory_size;
 519         unsigned int valid_samples;
 520         unsigned int discard;
 521         int trigger_now;
 522
 523         if (sdi->status != SR_ST_ACTIVE)
 524                 return SR_ERR_DEV_CLOSED;
 525
 526         devc = sdi->priv;
 527
 528         if (analyzer_add_triggers(sdi) != SR_OK) {
 529                 sr_err("Failed to configure triggers.");
 530                 return SR_ERR;
 531         }
 532
 533         usb = sdi->conn;
 534
 535         set_triggerbar(devc);
 536
 537         /* Push configured settings to device. */
 538         analyzer_configure(usb->devhdl);
 539
 540         analyzer_start(usb->devhdl);
 541         sr_info("Waiting for data.");
 542         analyzer_wait_data(usb->devhdl);
 543
 544         status = analyzer_read_status(usb->devhdl);
 545         stop_address = analyzer_get_stop_address(usb->devhdl);
 546         now_address = analyzer_get_now_address(usb->devhdl);
 547         trigger_address = analyzer_get_trigger_address(usb->devhdl);
 548
 549         triggerbar = analyzer_get_triggerbar_address();
 550         ramsize_trigger = analyzer_get_ramsize_trigger_address();
 551
 552         n = get_memory_size(devc->memory_size);
 553         memory_size = n / 4;
 554
 555         sr_info("Status = 0x%x.", status);
 556         sr_info("Stop address       = 0x%x.", stop_address);
 557         sr_info("Now address        = 0x%x.", now_address);
 558         sr_info("Trigger address    = 0x%x.", trigger_address);
 559         sr_info("Triggerbar address = 0x%x.", triggerbar);
 560         sr_info("Ramsize trigger    = 0x%x.", ramsize_trigger);
 561         sr_info("Memory size        = 0x%x.", memory_size);
 562
 563         std_session_send_df_header(sdi, LOG_PREFIX);
 564
 565         /* Check for empty capture */
 566         if ((status & STATUS_READY) && !stop_address) {
 567                 std_session_send_df_end(sdi, LOG_PREFIX);
 568                 return SR_OK;
 569         }
 570
 571         buf = g_malloc(PACKET_SIZE);
 572
 573         /* Check if the trigger is in the samples we are throwing away */
 574         trigger_now = now_address == trigger_address ||
 575                 ((now_address + 1) % memory_size) == trigger_address;
 576
 577         /*
 578          * STATUS_READY doesn't clear until now_address advances past
 579          * addr 0, but for our logic, clear it in that case
 580          */
 581         if (!now_address)
 582                 status &= ~STATUS_READY;
 583
 584         analyzer_read_start(usb->devhdl);
 585
 586         /* Calculate how much data to discard */
 587         discard = 0;
 588         if (status & STATUS_READY) {
 589                 /*
 590                  * We haven't wrapped around, we need to throw away data from
 591                  * our current position to the end of the buffer.
 592                  * Additionally, the first two samples captured are always
 593                  * bogus.
 594                  */
 595                 discard += memory_size - now_address + 2;
 596                 now_address = 2;
 597         }
 598
 599         /* If we have more samples than we need, discard them */
 600         valid_samples = (stop_address - now_address) % memory_size;
 601         if (valid_samples > ramsize_trigger + triggerbar) {
 602                 discard += valid_samples - (ramsize_trigger + triggerbar);
 603                 now_address += valid_samples - (ramsize_trigger + triggerbar);
 604         }
 605
 606         sr_info("Need to discard %d samples.", discard);
 607
 608         /* Calculate how far in the trigger is */
 609         if (trigger_now)
 610                 trigger_offset = 0;
 611         else
 612                 trigger_offset = (trigger_address - now_address) % memory_size;
 613
 614         /* Recalculate the number of samples available */
 615         valid_samples = (stop_address - now_address) % memory_size;
 616
 617         /* Send the incoming transfer to the session bus. */
 618         samples_read = 0;
 619         for (packet_num = 0; packet_num < n / PACKET_SIZE; packet_num++) {
 620                 unsigned int len;
 621                 unsigned int buf_offset;
 622
 623                 res = analyzer_read_data(usb->devhdl, buf, PACKET_SIZE);
 624                 sr_info("Tried to read %d bytes, actually read %d bytes.",
 625                         PACKET_SIZE, res);
 626
 627                 if (discard >= PACKET_SIZE / 4) {
 628                         discard -= PACKET_SIZE / 4;
 629                         continue;
 630                 }
 631
 632                 len = PACKET_SIZE - discard * 4;
 633                 buf_offset = discard * 4;
 634                 discard = 0;
 635
 636                 /* Check if we've read all the samples */
 637                 if (samples_read + len / 4 >= valid_samples)
 638                         len = (valid_samples - samples_read) * 4;
 639                 if (!len)
 640                         break;
 641
 642                 if (samples_read < trigger_offset &&
 643                     samples_read + len / 4 > trigger_offset) {
 644                         /* Send out samples remaining before trigger */
 645                         packet.type = SR_DF_LOGIC;
 646                         packet.payload = &logic;
 647                         logic.length = (trigger_offset - samples_read) * 4;
 648                         logic.unitsize = 4;
 649                         logic.data = buf + buf_offset;
 650                         sr_session_send(sdi, &packet);
 651                         len -= logic.length;
 652                         samples_read += logic.length / 4;
 653                         buf_offset += logic.length;
 654                 }
 655
 656                 if (samples_read == trigger_offset) {
 657                         /* Send out trigger */
 658                         packet.type = SR_DF_TRIGGER;
 659                         packet.payload = NULL;
 660                         sr_session_send(sdi, &packet);
 661                 }
 662
 663                 /* Send out data (or data after trigger) */
 664                 packet.type = SR_DF_LOGIC;
 665                 packet.payload = &logic;
 666                 logic.length = len;
 667                 logic.unitsize = 4;
 668                 logic.data = buf + buf_offset;
 669                 sr_session_send(sdi, &packet);
 670                 samples_read += len / 4;
 671         }
 672         analyzer_read_stop(usb->devhdl);
 673         g_free(buf);
 674
 675         std_session_send_df_end(sdi, LOG_PREFIX);
 676
 677         return SR_OK;
 678 }
 679
 680 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 681 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 682 {
 683         struct sr_usb_dev_inst *usb;
 684
 685         std_session_send_df_end(sdi, LOG_PREFIX);
 686
 687         usb = sdi->conn;
 688         analyzer_reset(usb->devhdl);
 689         /* TODO: Need to cancel and free any queued up transfers. */
 690
 691         return SR_OK;
 692 }
 693
 694 SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info = {
 695         .name = "zeroplus-logic-cube",
 696         .longname = "ZEROPLUS Logic Cube LAP-C series",
 697         .api_version = 1,
 698         .init = init,
 699         .cleanup = std_cleanup,
 700         .scan = scan,
 701         .dev_list = std_dev_list,
 702         .dev_clear = NULL,
 703         .config_get = config_get,
 704         .config_set = config_set,
 705         .config_list = config_list,
 706         .dev_open = dev_open,
 707         .dev_close = dev_close,
 708         .dev_acquisition_start = dev_acquisition_start,
 709         .dev_acquisition_stop = dev_acquisition_stop,
 710         .context = NULL,
 711 };