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 "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 PACKET_SIZE                     2048    /* ?? */
  27
  28 //#define ZP_EXPERIMENTAL
  29
  30 struct zp_model {
  31         uint16_t vid;
  32         uint16_t pid;
  33         char *model_name;
  34         unsigned int channels;
  35         unsigned int sample_depth;      /* In Ksamples/channel */
  36         unsigned int max_sampling_freq;
  37 };
  38
  39 /*
  40  * Note -- 16032, 16064 and 16128 *usually* -- but not always -- have the
  41  * same 128K sample depth.
  42  */
  43 static const struct zp_model zeroplus_models[] = {
  44         {0x0c12, 0x7002, "LAP-16128U",    16, 128,  200},
  45         {0x0c12, 0x7009, "LAP-C(16064)",  16, 64,   100},
  46         {0x0c12, 0x700a, "LAP-C(16128)",  16, 128,  200},
  47         {0x0c12, 0x700b, "LAP-C(32128)",  32, 128,  200},
  48         {0x0c12, 0x700c, "LAP-C(321000)", 32, 1024, 200},
  49         {0x0c12, 0x700d, "LAP-C(322000)", 32, 2048, 200},
  50         {0x0c12, 0x700e, "LAP-C(16032)",  16, 32,   100},
  51         {0x0c12, 0x7016, "LAP-C(162000)", 16, 2048, 200},
  52         {0x0c12, 0x7100, "AKIP-9101", 16, 256, 200},
  53         { 0, 0, 0, 0, 0, 0 }
  54 };
  55
  56 static const uint32_t devopts[] = {
  57         SR_CONF_LOGIC_ANALYZER,
  58         SR_CONF_LIMIT_SAMPLES | SR_CONF_SET | SR_CONF_LIST,
  59         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  60         SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
  61         SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
  62         SR_CONF_VOLTAGE_THRESHOLD | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  63 };
  64
  65 static const int32_t trigger_matches[] = {
  66         SR_TRIGGER_ZERO,
  67         SR_TRIGGER_ONE,
  68 };
  69
  70 /*
  71  * ZEROPLUS LAP-C (16032) numbers the 16 channels A0-A7 and B0-B7.
  72  * We currently ignore other untested/unsupported devices here.
  73  */
  74 static const char *channel_names[] = {
  75         "A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7",
  76         "B0", "B1", "B2", "B3", "B4", "B5", "B6", "B7",
  77         "C0", "C1", "C2", "C3", "C4", "C5", "C6", "C7",
  78         "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",
  79         NULL,
  80 };
  81
  82 SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info;
  83 static struct sr_dev_driver *di = &zeroplus_logic_cube_driver_info;
  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 int init(struct sr_context *sr_ctx)
 160 {
 161         return std_init(sr_ctx, di, LOG_PREFIX);
 162 }
 163
 164 static GSList *scan(GSList *options)
 165 {
 166         struct sr_dev_inst *sdi;
 167         struct sr_channel *ch;
 168         struct drv_context *drvc;
 169         struct dev_context *devc;
 170         const struct zp_model *prof;
 171         struct libusb_device_descriptor des;
 172         struct libusb_device_handle *hdl;
 173         libusb_device **devlist;
 174         GSList *devices;
 175         int ret, i, j;
 176         char serial_num[64], connection_id[64];
 177
 178         (void)options;
 179
 180         drvc = di->priv;
 181
 182         devices = NULL;
 183
 184         /* Find all ZEROPLUS analyzers and add them to device list. */
 185         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist); /* TODO: Errors. */
 186
 187         for (i = 0; devlist[i]; i++) {
 188                 ret = libusb_get_device_descriptor(devlist[i], &des);
 189                 if (ret != 0) {
 190                         sr_err("Failed to get device descriptor: %s.",
 191                                libusb_error_name(ret));
 192                         continue;
 193                 }
 194
 195                 if ((ret = libusb_open(devlist[i], &hdl)) < 0)
 196                         continue;
 197
 198                 if (des.iSerialNumber == 0) {
 199                         serial_num[0] = '\0';
 200                 } else if ((ret = libusb_get_string_descriptor_ascii(hdl,
 201                                 des.iSerialNumber, (unsigned char *) serial_num,
 202                                 sizeof(serial_num))) < 0) {
 203                         sr_warn("Failed to get serial number string descriptor: %s.",
 204                                 libusb_error_name(ret));
 205                         continue;
 206                 }
 207
 208                 libusb_close(hdl);
 209
 210                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 211
 212                 prof = NULL;
 213                 for (j = 0; j < zeroplus_models[j].vid; j++) {
 214                         if (des.idVendor == zeroplus_models[j].vid &&
 215                                 des.idProduct == zeroplus_models[j].pid) {
 216                                 prof = &zeroplus_models[j];
 217                         }
 218                 }
 219                 /* Skip if the device was not found. */
 220                 if (!prof)
 221                         continue;
 222                 sr_info("Found ZEROPLUS %s.", prof->model_name);
 223
 224                 /* Register the device with libsigrok. */
 225                 sdi = sr_dev_inst_new();
 226                 sdi->status = SR_ST_INACTIVE;
 227                 sdi->vendor = g_strdup(VENDOR_NAME);
 228                 sdi->model = g_strdup(prof->model_name);
 229                 sdi->driver = di;
 230                 sdi->serial_num = g_strdup(serial_num);
 231                 sdi->connection_id = g_strdup(connection_id);
 232
 233                 /* Allocate memory for our private driver context. */
 234                 if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
 235                         sr_err("Device context malloc failed.");
 236                         return NULL;
 237                 }
 238
 239                 sdi->priv = devc;
 240                 devc->prof = prof;
 241                 devc->num_channels = prof->channels;
 242 #ifdef ZP_EXPERIMENTAL
 243                 devc->max_sample_depth = 128 * 1024;
 244                 devc->max_samplerate = 200;
 245 #else
 246                 devc->max_sample_depth = prof->sample_depth * 1024;
 247                 devc->max_samplerate = prof->max_sampling_freq;
 248 #endif
 249                 devc->max_samplerate *= SR_MHZ(1);
 250                 devc->memory_size = MEMORY_SIZE_8K;
 251                 // memset(devc->trigger_buffer, 0, NUM_TRIGGER_STAGES);
 252
 253                 /* Fill in channellist according to this device's profile. */
 254                 for (j = 0; j < devc->num_channels; j++) {
 255                         if (!(ch = sr_channel_new(j, SR_CHANNEL_LOGIC, TRUE,
 256                                         channel_names[j])))
 257                                 return NULL;
 258                         sdi->channels = g_slist_append(sdi->channels, ch);
 259                 }
 260
 261                 devices = g_slist_append(devices, sdi);
 262                 drvc->instances = g_slist_append(drvc->instances, sdi);
 263                 sdi->inst_type = SR_INST_USB;
 264                 sdi->conn = sr_usb_dev_inst_new(
 265                         libusb_get_bus_number(devlist[i]),
 266                         libusb_get_device_address(devlist[i]), NULL);
 267         }
 268         libusb_free_device_list(devlist, 1);
 269
 270         return devices;
 271 }
 272
 273 static GSList *dev_list(void)
 274 {
 275         return ((struct drv_context *)(di->priv))->instances;
 276 }
 277
 278 static int dev_open(struct sr_dev_inst *sdi)
 279 {
 280         struct dev_context *devc;
 281         struct drv_context *drvc;
 282         struct sr_usb_dev_inst *usb;
 283         libusb_device **devlist, *dev;
 284         int device_count, ret, i;
 285         char connection_id[64];
 286
 287         drvc = di->priv;
 288         usb = sdi->conn;
 289
 290         if (!(devc = sdi->priv)) {
 291                 sr_err("%s: sdi->priv was NULL", __func__);
 292                 return SR_ERR_ARG;
 293         }
 294
 295         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx,
 296                                               &devlist);
 297         if (device_count < 0) {
 298                 sr_err("Failed to retrieve device list.");
 299                 return SR_ERR;
 300         }
 301
 302         dev = NULL;
 303         for (i = 0; i < device_count; i++) {
 304                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 305                 if (!strcmp(sdi->connection_id, connection_id)) {
 306                         dev = devlist[i];
 307                         break;
 308                 }
 309         }
 310         if (!dev) {
 311                 sr_err("Device on %d.%d (logical) / %s (physical) disappeared!",
 312                        usb->bus, usb->address, sdi->connection_id);
 313                 return SR_ERR;
 314         }
 315
 316         if (!(ret = libusb_open(dev, &(usb->devhdl)))) {
 317                 sdi->status = SR_ST_ACTIVE;
 318                 sr_info("Opened device on %d.%d (logical) / %s (physical) interface %d.",
 319                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 320         } else {
 321                 sr_err("Failed to open device: %s.", libusb_error_name(ret));
 322                 return SR_ERR;
 323         }
 324
 325         ret = libusb_set_configuration(usb->devhdl, USB_CONFIGURATION);
 326         if (ret < 0) {
 327                 sr_err("Unable to set USB configuration %d: %s.",
 328                        USB_CONFIGURATION, libusb_error_name(ret));
 329                 return SR_ERR;
 330         }
 331
 332         ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 333         if (ret != 0) {
 334                 sr_err("Unable to claim interface: %s.",
 335                        libusb_error_name(ret));
 336                 return SR_ERR;
 337         }
 338
 339         /* Set default configuration after power on. */
 340         if (analyzer_read_status(usb->devhdl) == 0)
 341                 analyzer_configure(usb->devhdl);
 342
 343         analyzer_reset(usb->devhdl);
 344         analyzer_initialize(usb->devhdl);
 345
 346         //analyzer_set_memory_size(MEMORY_SIZE_512K);
 347         // analyzer_set_freq(g_freq, g_freq_scale);
 348         analyzer_set_trigger_count(1);
 349         // analyzer_set_ramsize_trigger_address((((100 - g_pre_trigger)
 350         // * get_memory_size(g_memory_size)) / 100) >> 2);
 351
 352 #if 0
 353         if (g_double_mode == 1)
 354                 analyzer_set_compression(COMPRESSION_DOUBLE);
 355         else if (g_compression == 1)
 356                 analyzer_set_compression(COMPRESSION_ENABLE);
 357         else
 358 #endif
 359         analyzer_set_compression(COMPRESSION_NONE);
 360
 361         if (devc->cur_samplerate == 0) {
 362                 /* Samplerate hasn't been set. Default to 1MHz. */
 363                 analyzer_set_freq(1, FREQ_SCALE_MHZ);
 364                 devc->cur_samplerate = SR_MHZ(1);
 365         }
 366
 367         if (devc->cur_threshold == 0)
 368                 set_voltage_threshold(devc, 1.5);
 369
 370         return SR_OK;
 371 }
 372
 373 static int dev_close(struct sr_dev_inst *sdi)
 374 {
 375         struct sr_usb_dev_inst *usb;
 376
 377         usb = sdi->conn;
 378
 379         if (!usb->devhdl)
 380                 return SR_ERR;
 381
 382         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 383                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 384         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 385         libusb_reset_device(usb->devhdl);
 386         libusb_close(usb->devhdl);
 387         usb->devhdl = NULL;
 388         sdi->status = SR_ST_INACTIVE;
 389
 390         return SR_OK;
 391 }
 392
 393 static int cleanup(void)
 394 {
 395         return std_dev_clear(di, NULL);
 396 }
 397
 398 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 399                 const struct sr_channel_group *cg)
 400 {
 401         struct dev_context *devc;
 402
 403         (void)cg;
 404
 405         switch (key) {
 406         case SR_CONF_SAMPLERATE:
 407                 if (sdi) {
 408                         devc = sdi->priv;
 409                         *data = g_variant_new_uint64(devc->cur_samplerate);
 410                         sr_spew("Returning samplerate: %" PRIu64 "Hz.",
 411                                 devc->cur_samplerate);
 412                 } else
 413                         return SR_ERR_ARG;
 414                 break;
 415         case SR_CONF_CAPTURE_RATIO:
 416                 if (sdi) {
 417                         devc = sdi->priv;
 418                         *data = g_variant_new_uint64(devc->capture_ratio);
 419                 } else
 420                         return SR_ERR_ARG;
 421                 break;
 422         case SR_CONF_VOLTAGE_THRESHOLD:
 423                 if (sdi) {
 424                         GVariant *range[2];
 425                         devc = sdi->priv;
 426                         range[0] = g_variant_new_double(devc->cur_threshold);
 427                         range[1] = g_variant_new_double(devc->cur_threshold);
 428                         *data = g_variant_new_tuple(range, 2);
 429                 } else
 430                         return SR_ERR_ARG;
 431                 break;
 432         default:
 433                 return SR_ERR_NA;
 434         }
 435
 436         return SR_OK;
 437 }
 438
 439 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 440                 const struct sr_channel_group *cg)
 441 {
 442         struct dev_context *devc;
 443         gdouble low, high;
 444
 445         (void)cg;
 446
 447         if (sdi->status != SR_ST_ACTIVE)
 448                 return SR_ERR_DEV_CLOSED;
 449
 450         if (!(devc = sdi->priv)) {
 451                 sr_err("%s: sdi->priv was NULL", __func__);
 452                 return SR_ERR_ARG;
 453         }
 454
 455         switch (key) {
 456         case SR_CONF_SAMPLERATE:
 457                 return zp_set_samplerate(devc, g_variant_get_uint64(data));
 458         case SR_CONF_LIMIT_SAMPLES:
 459                 return set_limit_samples(devc, g_variant_get_uint64(data));
 460         case SR_CONF_CAPTURE_RATIO:
 461                 return set_capture_ratio(devc, g_variant_get_uint64(data));
 462         case SR_CONF_VOLTAGE_THRESHOLD:
 463                 g_variant_get(data, "(dd)", &low, &high);
 464                 return set_voltage_threshold(devc, (low + high) / 2.0);
 465         default:
 466                 return SR_ERR_NA;
 467         }
 468
 469         return SR_OK;
 470 }
 471
 472 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 473                 const struct sr_channel_group *cg)
 474 {
 475         struct dev_context *devc;
 476         GVariant *gvar, *grange[2];
 477         GVariantBuilder gvb;
 478         double v;
 479         GVariant *range[2];
 480
 481         (void)cg;
 482
 483         switch (key) {
 484         case SR_CONF_DEVICE_OPTIONS:
 485                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 486                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 487                 break;
 488         case SR_CONF_SAMPLERATE:
 489                 devc = sdi->priv;
 490                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 491                 if (devc->prof->max_sampling_freq == 100) {
 492                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 493                                         samplerates_100, ARRAY_SIZE(samplerates_100),
 494                                         sizeof(uint64_t));
 495                 } else if (devc->prof->max_sampling_freq == 200) {
 496                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 497                                         samplerates_200, ARRAY_SIZE(samplerates_200),
 498                                         sizeof(uint64_t));
 499                 } else {
 500                         sr_err("Internal error: Unknown max. samplerate: %d.",
 501                                devc->prof->max_sampling_freq);
 502                         return SR_ERR_ARG;
 503                 }
 504                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 505                 *data = g_variant_builder_end(&gvb);
 506                 break;
 507         case SR_CONF_TRIGGER_MATCH:
 508                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 509                                 trigger_matches, ARRAY_SIZE(trigger_matches),
 510                                 sizeof(int32_t));
 511                 break;
 512         case SR_CONF_VOLTAGE_THRESHOLD:
 513                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 514                 for (v = -6.0; v <= 6.0; v += 0.1) {
 515                         range[0] = g_variant_new_double(v);
 516                         range[1] = g_variant_new_double(v);
 517                         gvar = g_variant_new_tuple(range, 2);
 518                         g_variant_builder_add_value(&gvb, gvar);
 519                 }
 520                 *data = g_variant_builder_end(&gvb);
 521                 break;
 522         case SR_CONF_LIMIT_SAMPLES:
 523                 if (!sdi)
 524                         return SR_ERR_ARG;
 525                 devc = sdi->priv;
 526                 grange[0] = g_variant_new_uint64(0);
 527                 grange[1] = g_variant_new_uint64(devc->max_sample_depth);
 528                 *data = g_variant_new_tuple(grange, 2);
 529                 break;
 530         default:
 531                 return SR_ERR_NA;
 532         }
 533
 534         return SR_OK;
 535 }
 536
 537 static int dev_acquisition_start(const struct sr_dev_inst *sdi,
 538                 void *cb_data)
 539 {
 540         struct dev_context *devc;
 541         struct sr_usb_dev_inst *usb;
 542         struct sr_datafeed_packet packet;
 543         struct sr_datafeed_logic logic;
 544         unsigned int samples_read;
 545         int res;
 546         unsigned int packet_num, n;
 547         unsigned char *buf;
 548         unsigned int status;
 549         unsigned int stop_address;
 550         unsigned int now_address;
 551         unsigned int trigger_address;
 552         unsigned int trigger_offset;
 553         unsigned int triggerbar;
 554         unsigned int ramsize_trigger;
 555         unsigned int memory_size;
 556         unsigned int valid_samples;
 557         unsigned int discard;
 558         int trigger_now;
 559
 560         if (sdi->status != SR_ST_ACTIVE)
 561                 return SR_ERR_DEV_CLOSED;
 562
 563         if (!(devc = sdi->priv)) {
 564                 sr_err("%s: sdi->priv was NULL", __func__);
 565                 return SR_ERR_ARG;
 566         }
 567
 568         if (analyzer_add_triggers(sdi) != SR_OK) {
 569                 sr_err("Failed to configure triggers.");
 570                 return SR_ERR;
 571         }
 572
 573         usb = sdi->conn;
 574
 575         set_triggerbar(devc);
 576
 577         /* Push configured settings to device. */
 578         analyzer_configure(usb->devhdl);
 579
 580         analyzer_start(usb->devhdl);
 581         sr_info("Waiting for data.");
 582         analyzer_wait_data(usb->devhdl);
 583
 584         status = analyzer_read_status(usb->devhdl);
 585         stop_address = analyzer_get_stop_address(usb->devhdl);
 586         now_address = analyzer_get_now_address(usb->devhdl);
 587         trigger_address = analyzer_get_trigger_address(usb->devhdl);
 588
 589         triggerbar = analyzer_get_triggerbar_address();
 590         ramsize_trigger = analyzer_get_ramsize_trigger_address();
 591
 592         n = get_memory_size(devc->memory_size);
 593         memory_size = n / 4;
 594
 595         sr_info("Status = 0x%x.", status);
 596         sr_info("Stop address       = 0x%x.", stop_address);
 597         sr_info("Now address        = 0x%x.", now_address);
 598         sr_info("Trigger address    = 0x%x.", trigger_address);
 599         sr_info("Triggerbar address = 0x%x.", triggerbar);
 600         sr_info("Ramsize trigger    = 0x%x.", ramsize_trigger);
 601         sr_info("Memory size        = 0x%x.", memory_size);
 602
 603         /* Send header packet to the session bus. */
 604         std_session_send_df_header(cb_data, LOG_PREFIX);
 605
 606         /* Check for empty capture */
 607         if ((status & STATUS_READY) && !stop_address) {
 608                 packet.type = SR_DF_END;
 609                 sr_session_send(cb_data, &packet);
 610                 return SR_OK;
 611         }
 612
 613         if (!(buf = g_try_malloc(PACKET_SIZE))) {
 614                 sr_err("Packet buffer malloc failed.");
 615                 return SR_ERR_MALLOC;
 616         }
 617
 618         /* Check if the trigger is in the samples we are throwing away */
 619         trigger_now = now_address == trigger_address ||
 620                 ((now_address + 1) % memory_size) == trigger_address;
 621
 622         /*
 623          * STATUS_READY doesn't clear until now_address advances past
 624          * addr 0, but for our logic, clear it in that case
 625          */
 626         if (!now_address)
 627                 status &= ~STATUS_READY;
 628
 629         analyzer_read_start(usb->devhdl);
 630
 631         /* Calculate how much data to discard */
 632         discard = 0;
 633         if (status & STATUS_READY) {
 634                 /*
 635                  * We haven't wrapped around, we need to throw away data from
 636                  * our current position to the end of the buffer.
 637                  * Additionally, the first two samples captured are always
 638                  * bogus.
 639                  */
 640                 discard += memory_size - now_address + 2;
 641                 now_address = 2;
 642         }
 643
 644         /* If we have more samples than we need, discard them */
 645         valid_samples = (stop_address - now_address) % memory_size;
 646         if (valid_samples > ramsize_trigger + triggerbar) {
 647                 discard += valid_samples - (ramsize_trigger + triggerbar);
 648                 now_address += valid_samples - (ramsize_trigger + triggerbar);
 649         }
 650
 651         sr_info("Need to discard %d samples.", discard);
 652
 653         /* Calculate how far in the trigger is */
 654         if (trigger_now)
 655                 trigger_offset = 0;
 656         else
 657                 trigger_offset = (trigger_address - now_address) % memory_size;
 658
 659         /* Recalculate the number of samples available */
 660         valid_samples = (stop_address - now_address) % memory_size;
 661
 662         /* Send the incoming transfer to the session bus. */
 663         samples_read = 0;
 664         for (packet_num = 0; packet_num < n / PACKET_SIZE; packet_num++) {
 665                 unsigned int len;
 666                 unsigned int buf_offset;
 667
 668                 res = analyzer_read_data(usb->devhdl, buf, PACKET_SIZE);
 669                 sr_info("Tried to read %d bytes, actually read %d bytes.",
 670                         PACKET_SIZE, res);
 671
 672                 if (discard >= PACKET_SIZE / 4) {
 673                         discard -= PACKET_SIZE / 4;
 674                         continue;
 675                 }
 676
 677                 len = PACKET_SIZE - discard * 4;
 678                 buf_offset = discard * 4;
 679                 discard = 0;
 680
 681                 /* Check if we've read all the samples */
 682                 if (samples_read + len / 4 >= valid_samples)
 683                         len = (valid_samples - samples_read) * 4;
 684                 if (!len)
 685                         break;
 686
 687                 if (samples_read < trigger_offset &&
 688                     samples_read + len / 4 > trigger_offset) {
 689                         /* Send out samples remaining before trigger */
 690                         packet.type = SR_DF_LOGIC;
 691                         packet.payload = &logic;
 692                         logic.length = (trigger_offset - samples_read) * 4;
 693                         logic.unitsize = 4;
 694                         logic.data = buf + buf_offset;
 695                         sr_session_send(cb_data, &packet);
 696                         len -= logic.length;
 697                         samples_read += logic.length / 4;
 698                         buf_offset += logic.length;
 699                 }
 700
 701                 if (samples_read == trigger_offset) {
 702                         /* Send out trigger */
 703                         packet.type = SR_DF_TRIGGER;
 704                         packet.payload = NULL;
 705                         sr_session_send(cb_data, &packet);
 706                 }
 707
 708                 /* Send out data (or data after trigger) */
 709                 packet.type = SR_DF_LOGIC;
 710                 packet.payload = &logic;
 711                 logic.length = len;
 712                 logic.unitsize = 4;
 713                 logic.data = buf + buf_offset;
 714                 sr_session_send(cb_data, &packet);
 715                 samples_read += len / 4;
 716         }
 717         analyzer_read_stop(usb->devhdl);
 718         g_free(buf);
 719
 720         packet.type = SR_DF_END;
 721         sr_session_send(cb_data, &packet);
 722
 723         return SR_OK;
 724 }
 725
 726 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 727 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 728 {
 729         struct dev_context *devc;
 730         struct sr_usb_dev_inst *usb;
 731         struct sr_datafeed_packet packet;
 732
 733         packet.type = SR_DF_END;
 734         sr_session_send(cb_data, &packet);
 735
 736         if (!(devc = sdi->priv)) {
 737                 sr_err("%s: sdi->priv was NULL", __func__);
 738                 return SR_ERR_BUG;
 739         }
 740
 741         usb = sdi->conn;
 742         analyzer_reset(usb->devhdl);
 743         /* TODO: Need to cancel and free any queued up transfers. */
 744
 745         return SR_OK;
 746 }
 747
 748 SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info = {
 749         .name = "zeroplus-logic-cube",
 750         .longname = "ZEROPLUS Logic Cube LAP-C series",
 751         .api_version = 1,
 752         .init = init,
 753         .cleanup = cleanup,
 754         .scan = scan,
 755         .dev_list = dev_list,
 756         .dev_clear = NULL,
 757         .config_get = config_get,
 758         .config_set = config_set,
 759         .config_list = config_list,
 760         .dev_open = dev_open,
 761         .dev_close = dev_close,
 762         .dev_acquisition_start = dev_acquisition_start,
 763         .dev_acquisition_stop = dev_acquisition_stop,
 764         .priv = NULL,
 765 };