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 "protocol.h"
  21
  22 #define VENDOR_NAME                     "ZEROPLUS"
  23 #define USB_INTERFACE                   0
  24 #define USB_CONFIGURATION               1
  25 #define NUM_TRIGGER_STAGES              4
  26 #define TRIGGER_TYPE                    "01"
  27 #define PACKET_SIZE                     2048    /* ?? */
  28
  29 //#define ZP_EXPERIMENTAL
  30
  31 struct zp_model {
  32         uint16_t vid;
  33         uint16_t pid;
  34         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         { 0, 0, 0, 0, 0, 0 }
  54 };
  55
  56 static const int32_t hwcaps[] = {
  57         SR_CONF_LOGIC_ANALYZER,
  58         SR_CONF_SAMPLERATE,
  59         SR_CONF_CAPTURE_RATIO,
  60         SR_CONF_LIMIT_SAMPLES,
  61 };
  62
  63 /*
  64  * ZEROPLUS LAP-C (16032) numbers the 16 probes A0-A7 and B0-B7.
  65  * We currently ignore other untested/unsupported devices here.
  66  */
  67 static const char *probe_names[] = {
  68         "A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7",
  69         "B0", "B1", "B2", "B3", "B4", "B5", "B6", "B7",
  70         "C0", "C1", "C2", "C3", "C4", "C5", "C6", "C7",
  71         "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",
  72         NULL,
  73 };
  74
  75 SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info;
  76 static struct sr_dev_driver *di = &zeroplus_logic_cube_driver_info;
  77
  78 /*
  79  * The hardware supports more samplerates than these, but these are the
  80  * options hardcoded into the vendor's Windows GUI.
  81  */
  82
  83 static const uint64_t samplerates_100[] = {
  84         SR_HZ(100),
  85         SR_HZ(500),
  86         SR_KHZ(1),
  87         SR_KHZ(5),
  88         SR_KHZ(25),
  89         SR_KHZ(50),
  90         SR_KHZ(100),
  91         SR_KHZ(200),
  92         SR_KHZ(400),
  93         SR_KHZ(800),
  94         SR_MHZ(1),
  95         SR_MHZ(10),
  96         SR_MHZ(25),
  97         SR_MHZ(50),
  98         SR_MHZ(80),
  99         SR_MHZ(100),
 100 };
 101
 102 const uint64_t samplerates_200[] = {
 103         SR_HZ(100),
 104         SR_HZ(500),
 105         SR_KHZ(1),
 106         SR_KHZ(5),
 107         SR_KHZ(25),
 108         SR_KHZ(50),
 109         SR_KHZ(100),
 110         SR_KHZ(200),
 111         SR_KHZ(400),
 112         SR_KHZ(800),
 113         SR_MHZ(1),
 114         SR_MHZ(10),
 115         SR_MHZ(25),
 116         SR_MHZ(50),
 117         SR_MHZ(80),
 118         SR_MHZ(100),
 119         SR_MHZ(150),
 120         SR_MHZ(200),
 121 };
 122
 123 static int dev_close(struct sr_dev_inst *sdi);
 124
 125 #if 0
 126 static int configure_probes(const struct sr_dev_inst *sdi)
 127 {
 128         struct dev_context *devc;
 129         const struct sr_probe *probe;
 130         const GSList *l;
 131         int probe_bit, stage, i;
 132         char *tc;
 133
 134         /* Note: sdi and sdi->priv are non-NULL, the caller checked this. */
 135         devc = sdi->priv;
 136
 137         devc->probe_mask = 0;
 138         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 139                 devc->trigger_mask[i] = 0;
 140                 devc->trigger_value[i] = 0;
 141         }
 142
 143         stage = -1;
 144         for (l = sdi->probes; l; l = l->next) {
 145                 probe = (struct sr_probe *)l->data;
 146                 if (probe->enabled == FALSE)
 147                         continue;
 148                 probe_bit = 1 << (probe->index);
 149                 devc->probe_mask |= probe_bit;
 150
 151                 if (probe->trigger) {
 152                         stage = 0;
 153                         for (tc = probe->trigger; *tc; tc++) {
 154                                 devc->trigger_mask[stage] |= probe_bit;
 155                                 if (*tc == '1')
 156                                         devc->trigger_value[stage] |= probe_bit;
 157                                 stage++;
 158                                 if (stage > NUM_TRIGGER_STAGES)
 159                                         return SR_ERR;
 160                         }
 161                 }
 162         }
 163
 164         return SR_OK;
 165 }
 166 #endif
 167
 168 static int configure_probes(const struct sr_dev_inst *sdi)
 169 {
 170         struct dev_context *devc;
 171         const GSList *l;
 172         const struct sr_probe *probe;
 173         char *tc;
 174         int type;
 175
 176         /* Note: sdi and sdi->priv are non-NULL, the caller checked this. */
 177         devc = sdi->priv;
 178
 179         for (l = sdi->probes; l; l = l->next) {
 180                 probe = (struct sr_probe *)l->data;
 181                 if (probe->enabled == FALSE)
 182                         continue;
 183
 184                 if ((tc = probe->trigger)) {
 185                         switch (*tc) {
 186                         case '1':
 187                                 type = TRIGGER_HIGH;
 188                                 break;
 189                         case '0':
 190                                 type = TRIGGER_LOW;
 191                                 break;
 192 #if 0
 193                         case 'r':
 194                                 type = TRIGGER_POSEDGE;
 195                                 break;
 196                         case 'f':
 197                                 type = TRIGGER_NEGEDGE;
 198                                 break;
 199                         case 'c':
 200                                 type = TRIGGER_ANYEDGE;
 201                                 break;
 202 #endif
 203                         default:
 204                                 return SR_ERR;
 205                         }
 206                         analyzer_add_trigger(probe->index, type);
 207                         devc->trigger = 1;
 208                 }
 209         }
 210
 211         return SR_OK;
 212 }
 213
 214 SR_PRIV int zp_set_samplerate(struct dev_context *devc, uint64_t samplerate)
 215 {
 216         int i;
 217
 218         for (i = 0; ARRAY_SIZE(samplerates_200); i++)
 219                 if (samplerate == samplerates_200[i])
 220                         break;
 221
 222         if (i == ARRAY_SIZE(samplerates_200) || samplerate > devc->max_samplerate) {
 223                 sr_err("Unsupported samplerate: %" PRIu64 "Hz.", samplerate);
 224                 return SR_ERR_ARG;
 225         }
 226
 227         sr_info("Setting samplerate to %" PRIu64 "Hz.", samplerate);
 228
 229         if (samplerate >= SR_MHZ(1))
 230                 analyzer_set_freq(samplerate / SR_MHZ(1), FREQ_SCALE_MHZ);
 231         else if (samplerate >= SR_KHZ(1))
 232                 analyzer_set_freq(samplerate / SR_KHZ(1), FREQ_SCALE_KHZ);
 233         else
 234                 analyzer_set_freq(samplerate, FREQ_SCALE_HZ);
 235
 236         devc->cur_samplerate = samplerate;
 237
 238         return SR_OK;
 239 }
 240
 241 static int dev_clear(void)
 242 {
 243         return std_dev_clear(di, NULL);
 244 }
 245
 246 static int init(struct sr_context *sr_ctx)
 247 {
 248         return std_init(sr_ctx, di, LOG_PREFIX);
 249 }
 250
 251 static GSList *scan(GSList *options)
 252 {
 253         struct sr_dev_inst *sdi;
 254         struct sr_probe *probe;
 255         struct drv_context *drvc;
 256         struct dev_context *devc;
 257         const struct zp_model *prof;
 258         struct libusb_device_descriptor des;
 259         libusb_device **devlist;
 260         GSList *devices;
 261         int ret, devcnt, i, j;
 262
 263         (void)options;
 264
 265         drvc = di->priv;
 266
 267         devices = NULL;
 268
 269         /* Find all ZEROPLUS analyzers and add them to device list. */
 270         devcnt = 0;
 271         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist); /* TODO: Errors. */
 272
 273         for (i = 0; devlist[i]; i++) {
 274                 ret = libusb_get_device_descriptor(devlist[i], &des);
 275                 if (ret != 0) {
 276                         sr_err("Failed to get device descriptor: %s.",
 277                                libusb_error_name(ret));
 278                         continue;
 279                 }
 280
 281                 prof = NULL;
 282                 for (j = 0; j < zeroplus_models[j].vid; j++) {
 283                         if (des.idVendor == zeroplus_models[j].vid &&
 284                                 des.idProduct == zeroplus_models[j].pid) {
 285                                 prof = &zeroplus_models[j];
 286                         }
 287                 }
 288                 /* Skip if the device was not found. */
 289                 if (!prof)
 290                         continue;
 291                 sr_info("Found ZEROPLUS %s.", prof->model_name);
 292
 293                 /* Register the device with libsigrok. */
 294                 if (!(sdi = sr_dev_inst_new(devcnt, SR_ST_INACTIVE,
 295                                 VENDOR_NAME, prof->model_name, NULL))) {
 296                         sr_err("%s: sr_dev_inst_new failed", __func__);
 297                         return NULL;
 298                 }
 299                 sdi->driver = di;
 300
 301                 /* Allocate memory for our private driver context. */
 302                 if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
 303                         sr_err("Device context malloc failed.");
 304                         return NULL;
 305                 }
 306
 307                 sdi->priv = devc;
 308                 devc->prof = prof;
 309                 devc->num_channels = prof->channels;
 310 #ifdef ZP_EXPERIMENTAL
 311                 devc->max_sample_depth = 128 * 1024;
 312                 devc->max_samplerate = 200;
 313 #else
 314                 devc->max_sample_depth = prof->sample_depth * 1024;
 315                 devc->max_samplerate = prof->max_sampling_freq;
 316 #endif
 317                 devc->max_samplerate *= SR_MHZ(1);
 318                 devc->memory_size = MEMORY_SIZE_8K;
 319                 // memset(devc->trigger_buffer, 0, NUM_TRIGGER_STAGES);
 320
 321                 /* Fill in probelist according to this device's profile. */
 322                 for (j = 0; j < devc->num_channels; j++) {
 323                         if (!(probe = sr_probe_new(j, SR_PROBE_LOGIC, TRUE,
 324                                         probe_names[j])))
 325                                 return NULL;
 326                         sdi->probes = g_slist_append(sdi->probes, probe);
 327                 }
 328
 329                 devices = g_slist_append(devices, sdi);
 330                 drvc->instances = g_slist_append(drvc->instances, sdi);
 331                 sdi->inst_type = SR_INST_USB;
 332                 sdi->conn = sr_usb_dev_inst_new(
 333                         libusb_get_bus_number(devlist[i]),
 334                         libusb_get_device_address(devlist[i]), NULL);
 335                 devcnt++;
 336
 337         }
 338         libusb_free_device_list(devlist, 1);
 339
 340         return devices;
 341 }
 342
 343 static GSList *dev_list(void)
 344 {
 345         return ((struct drv_context *)(di->priv))->instances;
 346 }
 347
 348 static int dev_open(struct sr_dev_inst *sdi)
 349 {
 350         struct dev_context *devc;
 351         struct drv_context *drvc;
 352         struct sr_usb_dev_inst *usb;
 353         libusb_device **devlist, *dev;
 354         struct libusb_device_descriptor des;
 355         int device_count, ret, i;
 356
 357         drvc = di->priv;
 358         usb = sdi->conn;
 359
 360         if (!(devc = sdi->priv)) {
 361                 sr_err("%s: sdi->priv was NULL", __func__);
 362                 return SR_ERR_ARG;
 363         }
 364
 365         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx,
 366                                               &devlist);
 367         if (device_count < 0) {
 368                 sr_err("Failed to retrieve device list.");
 369                 return SR_ERR;
 370         }
 371
 372         dev = NULL;
 373         for (i = 0; i < device_count; i++) {
 374                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 375                         sr_err("Failed to get device descriptor: %s.",
 376                                libusb_error_name(ret));
 377                         continue;
 378                 }
 379                 if (libusb_get_bus_number(devlist[i]) == usb->bus
 380                     && libusb_get_device_address(devlist[i]) == usb->address) {
 381                         dev = devlist[i];
 382                         break;
 383                 }
 384         }
 385         if (!dev) {
 386                 sr_err("Device on bus %d address %d disappeared!",
 387                        usb->bus, usb->address);
 388                 return SR_ERR;
 389         }
 390
 391         if (!(ret = libusb_open(dev, &(usb->devhdl)))) {
 392                 sdi->status = SR_ST_ACTIVE;
 393                 sr_info("Opened device %d on %d.%d interface %d.",
 394                         sdi->index, usb->bus, usb->address, USB_INTERFACE);
 395         } else {
 396                 sr_err("Failed to open device: %s.", libusb_error_name(ret));
 397                 return SR_ERR;
 398         }
 399
 400         ret = libusb_set_configuration(usb->devhdl, USB_CONFIGURATION);
 401         if (ret < 0) {
 402                 sr_err("Unable to set USB configuration %d: %s.",
 403                        USB_CONFIGURATION, libusb_error_name(ret));
 404                 return SR_ERR;
 405         }
 406
 407         ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 408         if (ret != 0) {
 409                 sr_err("Unable to claim interface: %s.",
 410                        libusb_error_name(ret));
 411                 return SR_ERR;
 412         }
 413
 414         /* Set default configuration after power on. */
 415         if (analyzer_read_status(usb->devhdl) == 0)
 416                 analyzer_configure(usb->devhdl);
 417
 418         analyzer_reset(usb->devhdl);
 419         analyzer_initialize(usb->devhdl);
 420
 421         //analyzer_set_memory_size(MEMORY_SIZE_512K);
 422         // analyzer_set_freq(g_freq, g_freq_scale);
 423         analyzer_set_trigger_count(1);
 424         // analyzer_set_ramsize_trigger_address((((100 - g_pre_trigger)
 425         // * get_memory_size(g_memory_size)) / 100) >> 2);
 426
 427 #if 0
 428         if (g_double_mode == 1)
 429                 analyzer_set_compression(COMPRESSION_DOUBLE);
 430         else if (g_compression == 1)
 431                 analyzer_set_compression(COMPRESSION_ENABLE);
 432         else
 433 #endif
 434         analyzer_set_compression(COMPRESSION_NONE);
 435
 436         if (devc->cur_samplerate == 0) {
 437                 /* Samplerate hasn't been set. Default to 1MHz. */
 438                 analyzer_set_freq(1, FREQ_SCALE_MHZ);
 439                 devc->cur_samplerate = SR_MHZ(1);
 440         }
 441
 442         return SR_OK;
 443 }
 444
 445 static int dev_close(struct sr_dev_inst *sdi)
 446 {
 447         struct sr_usb_dev_inst *usb;
 448
 449         usb = sdi->conn;
 450
 451         if (!usb->devhdl)
 452                 return SR_ERR;
 453
 454         sr_info("Closing device %d on %d.%d interface %d.", sdi->index,
 455                 usb->bus, usb->address, USB_INTERFACE);
 456         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 457         libusb_reset_device(usb->devhdl);
 458         libusb_close(usb->devhdl);
 459         usb->devhdl = NULL;
 460         sdi->status = SR_ST_INACTIVE;
 461
 462         return SR_OK;
 463 }
 464
 465 static int cleanup(void)
 466 {
 467         return dev_clear();
 468 }
 469
 470 static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi,
 471                 const struct sr_probe_group *probe_group)
 472 {
 473         struct dev_context *devc;
 474
 475         (void)probe_group;
 476
 477         switch (id) {
 478         case SR_CONF_SAMPLERATE:
 479                 if (sdi) {
 480                         devc = sdi->priv;
 481                         *data = g_variant_new_uint64(devc->cur_samplerate);
 482                         sr_spew("Returning samplerate: %" PRIu64 "Hz.",
 483                                 devc->cur_samplerate);
 484                 } else
 485                         return SR_ERR;
 486                 break;
 487         case SR_CONF_CAPTURE_RATIO:
 488                 if (sdi) {
 489                         devc = sdi->priv;
 490                         *data = g_variant_new_uint64(devc->capture_ratio);
 491                 } else
 492                         return SR_ERR;
 493                 break;
 494         default:
 495                 return SR_ERR_NA;
 496         }
 497
 498         return SR_OK;
 499 }
 500
 501 static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi,
 502                 const struct sr_probe_group *probe_group)
 503 {
 504         struct dev_context *devc;
 505
 506         (void)probe_group;
 507
 508         if (sdi->status != SR_ST_ACTIVE)
 509                 return SR_ERR_DEV_CLOSED;
 510
 511         if (!(devc = sdi->priv)) {
 512                 sr_err("%s: sdi->priv was NULL", __func__);
 513                 return SR_ERR_ARG;
 514         }
 515
 516         switch (id) {
 517         case SR_CONF_SAMPLERATE:
 518                 return zp_set_samplerate(devc, g_variant_get_uint64(data));
 519         case SR_CONF_LIMIT_SAMPLES:
 520                 return set_limit_samples(devc, g_variant_get_uint64(data));
 521         case SR_CONF_CAPTURE_RATIO:
 522                 return set_capture_ratio(devc, g_variant_get_uint64(data));
 523         default:
 524                 return SR_ERR_NA;
 525         }
 526
 527         return SR_OK;
 528 }
 529
 530 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi,
 531                 const struct sr_probe_group *probe_group)
 532 {
 533         struct dev_context *devc;
 534         GVariant *gvar;
 535         GVariantBuilder gvb;
 536
 537         (void)probe_group;
 538
 539         switch (key) {
 540         case SR_CONF_DEVICE_OPTIONS:
 541                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 542                                 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
 543                 break;
 544         case SR_CONF_SAMPLERATE:
 545                 devc = sdi->priv;
 546                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 547                 if (devc->prof->max_sampling_freq == 100) {
 548                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 549                                         samplerates_100, ARRAY_SIZE(samplerates_100),
 550                                         sizeof(uint64_t));
 551                 } else if (devc->prof->max_sampling_freq == 200) {
 552                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 553                                         samplerates_200, ARRAY_SIZE(samplerates_200),
 554                                         sizeof(uint64_t));
 555                 } else {
 556                         sr_err("Internal error: Unknown max. samplerate: %d.",
 557                                devc->prof->max_sampling_freq);
 558                         return SR_ERR_ARG;
 559                 }
 560                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 561                 *data = g_variant_builder_end(&gvb);
 562                 break;
 563         case SR_CONF_TRIGGER_TYPE:
 564                 *data = g_variant_new_string(TRIGGER_TYPE);
 565                 break;
 566         default:
 567                 return SR_ERR_NA;
 568         }
 569
 570         return SR_OK;
 571 }
 572
 573 static int dev_acquisition_start(const struct sr_dev_inst *sdi,
 574                 void *cb_data)
 575 {
 576         struct dev_context *devc;
 577         struct sr_usb_dev_inst *usb;
 578         struct sr_datafeed_packet packet;
 579         struct sr_datafeed_logic logic;
 580         unsigned int samples_read;
 581         int res;
 582         unsigned int packet_num, n;
 583         unsigned char *buf;
 584         unsigned int status;
 585         unsigned int stop_address;
 586         unsigned int now_address;
 587         unsigned int trigger_address;
 588         unsigned int trigger_offset;
 589         unsigned int triggerbar;
 590         unsigned int ramsize_trigger;
 591         unsigned int memory_size;
 592         unsigned int valid_samples;
 593         unsigned int discard;
 594         int trigger_now;
 595
 596         if (sdi->status != SR_ST_ACTIVE)
 597                 return SR_ERR_DEV_CLOSED;
 598
 599         if (!(devc = sdi->priv)) {
 600                 sr_err("%s: sdi->priv was NULL", __func__);
 601                 return SR_ERR_ARG;
 602         }
 603
 604         if (configure_probes(sdi) != SR_OK) {
 605                 sr_err("Failed to configure probes.");
 606                 return SR_ERR;
 607         }
 608
 609         usb = sdi->conn;
 610
 611         set_triggerbar(devc);
 612
 613         /* Push configured settings to device. */
 614         analyzer_configure(usb->devhdl);
 615
 616         analyzer_start(usb->devhdl);
 617         sr_info("Waiting for data.");
 618         analyzer_wait_data(usb->devhdl);
 619
 620         status = analyzer_read_status(usb->devhdl);
 621         stop_address = analyzer_get_stop_address(usb->devhdl);
 622         now_address = analyzer_get_now_address(usb->devhdl);
 623         trigger_address = analyzer_get_trigger_address(usb->devhdl);
 624
 625         triggerbar = analyzer_get_triggerbar_address();
 626         ramsize_trigger = analyzer_get_ramsize_trigger_address();
 627
 628         n = get_memory_size(devc->memory_size);
 629         memory_size = n / 4;
 630
 631         sr_info("Status = 0x%x.", status);
 632         sr_info("Stop address       = 0x%x.", stop_address);
 633         sr_info("Now address        = 0x%x.", now_address);
 634         sr_info("Trigger address    = 0x%x.", trigger_address);
 635         sr_info("Triggerbar address = 0x%x.", triggerbar);
 636         sr_info("Ramsize trigger    = 0x%x.", ramsize_trigger);
 637         sr_info("Memory size        = 0x%x.", memory_size);
 638
 639         /* Send header packet to the session bus. */
 640         std_session_send_df_header(cb_data, LOG_PREFIX);
 641
 642         /* Check for empty capture */
 643         if ((status & STATUS_READY) && !stop_address) {
 644                 packet.type = SR_DF_END;
 645                 sr_session_send(cb_data, &packet);
 646                 return SR_OK;
 647         }
 648
 649         if (!(buf = g_try_malloc(PACKET_SIZE))) {
 650                 sr_err("Packet buffer malloc failed.");
 651                 return SR_ERR_MALLOC;
 652         }
 653
 654         /* Check if the trigger is in the samples we are throwing away */
 655         trigger_now = now_address == trigger_address ||
 656                 ((now_address + 1) % memory_size) == trigger_address;
 657
 658         /*
 659          * STATUS_READY doesn't clear until now_address advances past
 660          * addr 0, but for our logic, clear it in that case
 661          */
 662         if (!now_address)
 663                 status &= ~STATUS_READY;
 664
 665         analyzer_read_start(usb->devhdl);
 666
 667         /* Calculate how much data to discard */
 668         discard = 0;
 669         if (status & STATUS_READY) {
 670                 /*
 671                  * We haven't wrapped around, we need to throw away data from
 672                  * our current position to the end of the buffer.
 673                  * Additionally, the first two samples captured are always
 674                  * bogus.
 675                  */
 676                 discard += memory_size - now_address + 2;
 677                 now_address = 2;
 678         }
 679
 680         /* If we have more samples than we need, discard them */
 681         valid_samples = (stop_address - now_address) % memory_size;
 682         if (valid_samples > ramsize_trigger + triggerbar) {
 683                 discard += valid_samples - (ramsize_trigger + triggerbar);
 684                 now_address += valid_samples - (ramsize_trigger + triggerbar);
 685         }
 686
 687         sr_info("Need to discard %d samples.", discard);
 688
 689         /* Calculate how far in the trigger is */
 690         if (trigger_now)
 691                 trigger_offset = 0;
 692         else
 693                 trigger_offset = (trigger_address - now_address) % memory_size;
 694
 695         /* Recalculate the number of samples available */
 696         valid_samples = (stop_address - now_address) % memory_size;
 697
 698         /* Send the incoming transfer to the session bus. */
 699         samples_read = 0;
 700         for (packet_num = 0; packet_num < n / PACKET_SIZE; packet_num++) {
 701                 unsigned int len;
 702                 unsigned int buf_offset;
 703
 704                 res = analyzer_read_data(usb->devhdl, buf, PACKET_SIZE);
 705                 sr_info("Tried to read %d bytes, actually read %d bytes.",
 706                         PACKET_SIZE, res);
 707
 708                 if (discard >= PACKET_SIZE / 4) {
 709                         discard -= PACKET_SIZE / 4;
 710                         continue;
 711                 }
 712
 713                 len = PACKET_SIZE - discard * 4;
 714                 buf_offset = discard * 4;
 715                 discard = 0;
 716
 717                 /* Check if we've read all the samples */
 718                 if (samples_read + len / 4 >= valid_samples)
 719                         len = (valid_samples - samples_read) * 4;
 720                 if (!len)
 721                         break;
 722
 723                 if (samples_read < trigger_offset &&
 724                     samples_read + len / 4 > trigger_offset) {
 725                         /* Send out samples remaining before trigger */
 726                         packet.type = SR_DF_LOGIC;
 727                         packet.payload = &logic;
 728                         logic.length = (trigger_offset - samples_read) * 4;
 729                         logic.unitsize = 4;
 730                         logic.data = buf + buf_offset;
 731                         sr_session_send(cb_data, &packet);
 732                         len -= logic.length;
 733                         samples_read += logic.length / 4;
 734                         buf_offset += logic.length;
 735                 }
 736
 737                 if (samples_read == trigger_offset) {
 738                         /* Send out trigger */
 739                         packet.type = SR_DF_TRIGGER;
 740                         packet.payload = NULL;
 741                         sr_session_send(cb_data, &packet);
 742                 }
 743
 744                 /* Send out data (or data after trigger) */
 745                 packet.type = SR_DF_LOGIC;
 746                 packet.payload = &logic;
 747                 logic.length = len;
 748                 logic.unitsize = 4;
 749                 logic.data = buf + buf_offset;
 750                 sr_session_send(cb_data, &packet);
 751                 samples_read += len / 4;
 752         }
 753         analyzer_read_stop(usb->devhdl);
 754         g_free(buf);
 755
 756         packet.type = SR_DF_END;
 757         sr_session_send(cb_data, &packet);
 758
 759         return SR_OK;
 760 }
 761
 762 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 763 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 764 {
 765         struct dev_context *devc;
 766         struct sr_usb_dev_inst *usb;
 767         struct sr_datafeed_packet packet;
 768
 769         packet.type = SR_DF_END;
 770         sr_session_send(cb_data, &packet);
 771
 772         if (!(devc = sdi->priv)) {
 773                 sr_err("%s: sdi->priv was NULL", __func__);
 774                 return SR_ERR_BUG;
 775         }
 776
 777         usb = sdi->conn;
 778         analyzer_reset(usb->devhdl);
 779         /* TODO: Need to cancel and free any queued up transfers. */
 780
 781         return SR_OK;
 782 }
 783
 784 SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info = {
 785         .name = "zeroplus-logic-cube",
 786         .longname = "ZEROPLUS Logic Cube LAP-C series",
 787         .api_version = 1,
 788         .init = init,
 789         .cleanup = cleanup,
 790         .scan = scan,
 791         .dev_list = dev_list,
 792         .dev_clear = dev_clear,
 793         .config_get = config_get,
 794         .config_set = config_set,
 795         .config_list = config_list,
 796         .dev_open = dev_open,
 797         .dev_close = dev_close,
 798         .dev_acquisition_start = dev_acquisition_start,
 799         .dev_acquisition_stop = dev_acquisition_stop,
 800         .priv = NULL,
 801 };