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 };
  80
  81 SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info;
  82
  83 /*
  84  * The hardware supports more samplerates than these, but these are the
  85  * options hardcoded into the vendor's Windows GUI.
  86  */
  87
  88 static const uint64_t samplerates_100[] = {
  89         SR_HZ(100),
  90         SR_HZ(500),
  91         SR_KHZ(1),
  92         SR_KHZ(5),
  93         SR_KHZ(25),
  94         SR_KHZ(50),
  95         SR_KHZ(100),
  96         SR_KHZ(200),
  97         SR_KHZ(400),
  98         SR_KHZ(800),
  99         SR_MHZ(1),
 100         SR_MHZ(10),
 101         SR_MHZ(25),
 102         SR_MHZ(50),
 103         SR_MHZ(80),
 104         SR_MHZ(100),
 105 };
 106
 107 const uint64_t samplerates_200[] = {
 108         SR_HZ(100),
 109         SR_HZ(500),
 110         SR_KHZ(1),
 111         SR_KHZ(5),
 112         SR_KHZ(25),
 113         SR_KHZ(50),
 114         SR_KHZ(100),
 115         SR_KHZ(200),
 116         SR_KHZ(400),
 117         SR_KHZ(800),
 118         SR_MHZ(1),
 119         SR_MHZ(10),
 120         SR_MHZ(25),
 121         SR_MHZ(50),
 122         SR_MHZ(80),
 123         SR_MHZ(100),
 124         SR_MHZ(150),
 125         SR_MHZ(200),
 126 };
 127
 128 static int dev_close(struct sr_dev_inst *sdi);
 129
 130 SR_PRIV int zp_set_samplerate(struct dev_context *devc, uint64_t samplerate)
 131 {
 132         int i;
 133
 134         for (i = 0; ARRAY_SIZE(samplerates_200); i++)
 135                 if (samplerate == samplerates_200[i])
 136                         break;
 137
 138         if (i == ARRAY_SIZE(samplerates_200) || samplerate > devc->max_samplerate) {
 139                 sr_err("Unsupported samplerate: %" PRIu64 "Hz.", samplerate);
 140                 return SR_ERR_ARG;
 141         }
 142
 143         sr_info("Setting samplerate to %" PRIu64 "Hz.", samplerate);
 144
 145         if (samplerate >= SR_MHZ(1))
 146                 analyzer_set_freq(samplerate / SR_MHZ(1), FREQ_SCALE_MHZ);
 147         else if (samplerate >= SR_KHZ(1))
 148                 analyzer_set_freq(samplerate / SR_KHZ(1), FREQ_SCALE_KHZ);
 149         else
 150                 analyzer_set_freq(samplerate, FREQ_SCALE_HZ);
 151
 152         devc->cur_samplerate = samplerate;
 153
 154         return SR_OK;
 155 }
 156
 157 static int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
 158 {
 159         return std_init(sr_ctx, di, LOG_PREFIX);
 160 }
 161
 162 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 163 {
 164         struct sr_dev_inst *sdi;
 165         struct drv_context *drvc;
 166         struct dev_context *devc;
 167         const struct zp_model *prof;
 168         struct libusb_device_descriptor des;
 169         struct libusb_device_handle *hdl;
 170         libusb_device **devlist;
 171         GSList *devices;
 172         int ret, i, j;
 173         char serial_num[64], connection_id[64];
 174
 175         (void)options;
 176
 177         drvc = di->priv;
 178
 179         devices = NULL;
 180
 181         /* Find all ZEROPLUS analyzers and add them to device list. */
 182         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist); /* TODO: Errors. */
 183
 184         for (i = 0; devlist[i]; i++) {
 185                 ret = libusb_get_device_descriptor(devlist[i], &des);
 186                 if (ret != 0) {
 187                         sr_err("Failed to get device descriptor: %s.",
 188                                libusb_error_name(ret));
 189                         continue;
 190                 }
 191
 192                 if ((ret = libusb_open(devlist[i], &hdl)) < 0)
 193                         continue;
 194
 195                 if (des.iSerialNumber == 0) {
 196                         serial_num[0] = '\0';
 197                 } else if ((ret = libusb_get_string_descriptor_ascii(hdl,
 198                                 des.iSerialNumber, (unsigned char *) serial_num,
 199                                 sizeof(serial_num))) < 0) {
 200                         sr_warn("Failed to get serial number string descriptor: %s.",
 201                                 libusb_error_name(ret));
 202                         continue;
 203                 }
 204
 205                 libusb_close(hdl);
 206
 207                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 208
 209                 prof = NULL;
 210                 for (j = 0; j < zeroplus_models[j].vid; j++) {
 211                         if (des.idVendor == zeroplus_models[j].vid &&
 212                                 des.idProduct == zeroplus_models[j].pid) {
 213                                 prof = &zeroplus_models[j];
 214                         }
 215                 }
 216                 /* Skip if the device was not found. */
 217                 if (!prof)
 218                         continue;
 219                 sr_info("Found ZEROPLUS %s.", prof->model_name);
 220
 221                 /* Register the device with libsigrok. */
 222                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 223                 sdi->status = SR_ST_INACTIVE;
 224                 sdi->vendor = g_strdup(VENDOR_NAME);
 225                 sdi->model = g_strdup(prof->model_name);
 226                 sdi->driver = di;
 227                 sdi->serial_num = g_strdup(serial_num);
 228                 sdi->connection_id = g_strdup(connection_id);
 229
 230                 /* Allocate memory for our private driver context. */
 231                 devc = g_malloc0(sizeof(struct dev_context));
 232                 sdi->priv = devc;
 233                 devc->prof = prof;
 234                 devc->num_channels = prof->channels;
 235 #ifdef ZP_EXPERIMENTAL
 236                 devc->max_sample_depth = 128 * 1024;
 237                 devc->max_samplerate = 200;
 238 #else
 239                 devc->max_sample_depth = prof->sample_depth * 1024;
 240                 devc->max_samplerate = prof->max_sampling_freq;
 241 #endif
 242                 devc->max_samplerate *= SR_MHZ(1);
 243                 devc->memory_size = MEMORY_SIZE_8K;
 244                 // memset(devc->trigger_buffer, 0, NUM_TRIGGER_STAGES);
 245
 246                 /* Fill in channellist according to this device's profile. */
 247                 for (j = 0; j < devc->num_channels; j++)
 248                         sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE,
 249                                         channel_names[j]);
 250
 251                 devices = g_slist_append(devices, sdi);
 252                 drvc->instances = g_slist_append(drvc->instances, sdi);
 253                 sdi->inst_type = SR_INST_USB;
 254                 sdi->conn = sr_usb_dev_inst_new(
 255                         libusb_get_bus_number(devlist[i]),
 256                         libusb_get_device_address(devlist[i]), NULL);
 257         }
 258         libusb_free_device_list(devlist, 1);
 259
 260         return devices;
 261 }
 262
 263 static GSList *dev_list(const struct sr_dev_driver *di)
 264 {
 265         return ((struct drv_context *)(di->priv))->instances;
 266 }
 267
 268 static int dev_open(struct sr_dev_inst *sdi)
 269 {
 270         struct sr_dev_driver *di = sdi->driver;
 271         struct dev_context *devc;
 272         struct drv_context *drvc;
 273         struct sr_usb_dev_inst *usb;
 274         libusb_device **devlist, *dev;
 275         int device_count, ret, i;
 276         char connection_id[64];
 277
 278         drvc = di->priv;
 279         usb = sdi->conn;
 280
 281         if (!(devc = sdi->priv)) {
 282                 sr_err("%s: sdi->priv was NULL", __func__);
 283                 return SR_ERR_ARG;
 284         }
 285
 286         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx,
 287                                               &devlist);
 288         if (device_count < 0) {
 289                 sr_err("Failed to retrieve device list.");
 290                 return SR_ERR;
 291         }
 292
 293         dev = NULL;
 294         for (i = 0; i < device_count; i++) {
 295                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 296                 if (!strcmp(sdi->connection_id, connection_id)) {
 297                         dev = devlist[i];
 298                         break;
 299                 }
 300         }
 301         if (!dev) {
 302                 sr_err("Device on %d.%d (logical) / %s (physical) disappeared!",
 303                        usb->bus, usb->address, sdi->connection_id);
 304                 return SR_ERR;
 305         }
 306
 307         if (!(ret = libusb_open(dev, &(usb->devhdl)))) {
 308                 sdi->status = SR_ST_ACTIVE;
 309                 sr_info("Opened device on %d.%d (logical) / %s (physical) interface %d.",
 310                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 311         } else {
 312                 sr_err("Failed to open device: %s.", libusb_error_name(ret));
 313                 return SR_ERR;
 314         }
 315
 316         ret = libusb_set_configuration(usb->devhdl, USB_CONFIGURATION);
 317         if (ret < 0) {
 318                 sr_err("Unable to set USB configuration %d: %s.",
 319                        USB_CONFIGURATION, libusb_error_name(ret));
 320                 return SR_ERR;
 321         }
 322
 323         ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 324         if (ret != 0) {
 325                 sr_err("Unable to claim interface: %s.",
 326                        libusb_error_name(ret));
 327                 return SR_ERR;
 328         }
 329
 330         /* Set default configuration after power on. */
 331         if (analyzer_read_status(usb->devhdl) == 0)
 332                 analyzer_configure(usb->devhdl);
 333
 334         analyzer_reset(usb->devhdl);
 335         analyzer_initialize(usb->devhdl);
 336
 337         //analyzer_set_memory_size(MEMORY_SIZE_512K);
 338         // analyzer_set_freq(g_freq, g_freq_scale);
 339         analyzer_set_trigger_count(1);
 340         // analyzer_set_ramsize_trigger_address((((100 - g_pre_trigger)
 341         // * get_memory_size(g_memory_size)) / 100) >> 2);
 342
 343 #if 0
 344         if (g_double_mode == 1)
 345                 analyzer_set_compression(COMPRESSION_DOUBLE);
 346         else if (g_compression == 1)
 347                 analyzer_set_compression(COMPRESSION_ENABLE);
 348         else
 349 #endif
 350         analyzer_set_compression(COMPRESSION_NONE);
 351
 352         if (devc->cur_samplerate == 0) {
 353                 /* Samplerate hasn't been set. Default to 1MHz. */
 354                 analyzer_set_freq(1, FREQ_SCALE_MHZ);
 355                 devc->cur_samplerate = SR_MHZ(1);
 356         }
 357
 358         if (devc->cur_threshold == 0)
 359                 set_voltage_threshold(devc, 1.5);
 360
 361         return SR_OK;
 362 }
 363
 364 static int dev_close(struct sr_dev_inst *sdi)
 365 {
 366         struct sr_usb_dev_inst *usb;
 367
 368         usb = sdi->conn;
 369
 370         if (!usb->devhdl)
 371                 return SR_ERR;
 372
 373         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 374                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 375         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 376         libusb_reset_device(usb->devhdl);
 377         libusb_close(usb->devhdl);
 378         usb->devhdl = NULL;
 379         sdi->status = SR_ST_INACTIVE;
 380
 381         return SR_OK;
 382 }
 383
 384 static int cleanup(const struct sr_dev_driver *di)
 385 {
 386         return std_dev_clear(di, NULL);
 387 }
 388
 389 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 390                 const struct sr_channel_group *cg)
 391 {
 392         struct dev_context *devc;
 393         GVariant *range[2];
 394
 395         (void)cg;
 396
 397         if (!sdi)
 398                 return SR_ERR_ARG;
 399
 400         devc = sdi->priv;
 401
 402         switch (key) {
 403         case SR_CONF_SAMPLERATE:
 404                 *data = g_variant_new_uint64(devc->cur_samplerate);
 405                 break;
 406         case SR_CONF_CAPTURE_RATIO:
 407                 *data = g_variant_new_uint64(devc->capture_ratio);
 408                 break;
 409         case SR_CONF_VOLTAGE_THRESHOLD:
 410                 range[0] = g_variant_new_double(devc->cur_threshold);
 411                 range[1] = g_variant_new_double(devc->cur_threshold);
 412                 *data = g_variant_new_tuple(range, 2);
 413                 break;
 414         default:
 415                 return SR_ERR_NA;
 416         }
 417
 418         return SR_OK;
 419 }
 420
 421 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 422                 const struct sr_channel_group *cg)
 423 {
 424         struct dev_context *devc;
 425         gdouble low, high;
 426
 427         (void)cg;
 428
 429         if (sdi->status != SR_ST_ACTIVE)
 430                 return SR_ERR_DEV_CLOSED;
 431
 432         if (!(devc = sdi->priv)) {
 433                 sr_err("%s: sdi->priv was NULL", __func__);
 434                 return SR_ERR_ARG;
 435         }
 436
 437         switch (key) {
 438         case SR_CONF_SAMPLERATE:
 439                 return zp_set_samplerate(devc, g_variant_get_uint64(data));
 440         case SR_CONF_LIMIT_SAMPLES:
 441                 return set_limit_samples(devc, g_variant_get_uint64(data));
 442         case SR_CONF_CAPTURE_RATIO:
 443                 return set_capture_ratio(devc, g_variant_get_uint64(data));
 444         case SR_CONF_VOLTAGE_THRESHOLD:
 445                 g_variant_get(data, "(dd)", &low, &high);
 446                 return set_voltage_threshold(devc, (low + high) / 2.0);
 447         default:
 448                 return SR_ERR_NA;
 449         }
 450
 451         return SR_OK;
 452 }
 453
 454 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 455                 const struct sr_channel_group *cg)
 456 {
 457         struct dev_context *devc;
 458         GVariant *gvar, *grange[2];
 459         GVariantBuilder gvb;
 460         double v;
 461         GVariant *range[2];
 462
 463         (void)cg;
 464
 465         switch (key) {
 466         case SR_CONF_DEVICE_OPTIONS:
 467                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 468                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 469                 break;
 470         case SR_CONF_SAMPLERATE:
 471                 devc = sdi->priv;
 472                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 473                 if (devc->prof->max_sampling_freq == 100) {
 474                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 475                                         samplerates_100, ARRAY_SIZE(samplerates_100),
 476                                         sizeof(uint64_t));
 477                 } else if (devc->prof->max_sampling_freq == 200) {
 478                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 479                                         samplerates_200, ARRAY_SIZE(samplerates_200),
 480                                         sizeof(uint64_t));
 481                 } else {
 482                         sr_err("Internal error: Unknown max. samplerate: %d.",
 483                                devc->prof->max_sampling_freq);
 484                         return SR_ERR_ARG;
 485                 }
 486                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 487                 *data = g_variant_builder_end(&gvb);
 488                 break;
 489         case SR_CONF_TRIGGER_MATCH:
 490                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 491                                 trigger_matches, ARRAY_SIZE(trigger_matches),
 492                                 sizeof(int32_t));
 493                 break;
 494         case SR_CONF_VOLTAGE_THRESHOLD:
 495                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 496                 for (v = -6.0; v <= 6.0; v += 0.1) {
 497                         range[0] = g_variant_new_double(v);
 498                         range[1] = g_variant_new_double(v);
 499                         gvar = g_variant_new_tuple(range, 2);
 500                         g_variant_builder_add_value(&gvb, gvar);
 501                 }
 502                 *data = g_variant_builder_end(&gvb);
 503                 break;
 504         case SR_CONF_LIMIT_SAMPLES:
 505                 if (!sdi)
 506                         return SR_ERR_ARG;
 507                 devc = sdi->priv;
 508                 grange[0] = g_variant_new_uint64(0);
 509                 grange[1] = g_variant_new_uint64(devc->max_sample_depth);
 510                 *data = g_variant_new_tuple(grange, 2);
 511                 break;
 512         default:
 513                 return SR_ERR_NA;
 514         }
 515
 516         return SR_OK;
 517 }
 518
 519 static int dev_acquisition_start(const struct sr_dev_inst *sdi,
 520                 void *cb_data)
 521 {
 522         struct dev_context *devc;
 523         struct sr_usb_dev_inst *usb;
 524         struct sr_datafeed_packet packet;
 525         struct sr_datafeed_logic logic;
 526         unsigned int samples_read;
 527         int res;
 528         unsigned int packet_num, n;
 529         unsigned char *buf;
 530         unsigned int status;
 531         unsigned int stop_address;
 532         unsigned int now_address;
 533         unsigned int trigger_address;
 534         unsigned int trigger_offset;
 535         unsigned int triggerbar;
 536         unsigned int ramsize_trigger;
 537         unsigned int memory_size;
 538         unsigned int valid_samples;
 539         unsigned int discard;
 540         int trigger_now;
 541
 542         if (sdi->status != SR_ST_ACTIVE)
 543                 return SR_ERR_DEV_CLOSED;
 544
 545         if (!(devc = sdi->priv)) {
 546                 sr_err("%s: sdi->priv was NULL", __func__);
 547                 return SR_ERR_ARG;
 548         }
 549
 550         if (analyzer_add_triggers(sdi) != SR_OK) {
 551                 sr_err("Failed to configure triggers.");
 552                 return SR_ERR;
 553         }
 554
 555         usb = sdi->conn;
 556
 557         set_triggerbar(devc);
 558
 559         /* Push configured settings to device. */
 560         analyzer_configure(usb->devhdl);
 561
 562         analyzer_start(usb->devhdl);
 563         sr_info("Waiting for data.");
 564         analyzer_wait_data(usb->devhdl);
 565
 566         status = analyzer_read_status(usb->devhdl);
 567         stop_address = analyzer_get_stop_address(usb->devhdl);
 568         now_address = analyzer_get_now_address(usb->devhdl);
 569         trigger_address = analyzer_get_trigger_address(usb->devhdl);
 570
 571         triggerbar = analyzer_get_triggerbar_address();
 572         ramsize_trigger = analyzer_get_ramsize_trigger_address();
 573
 574         n = get_memory_size(devc->memory_size);
 575         memory_size = n / 4;
 576
 577         sr_info("Status = 0x%x.", status);
 578         sr_info("Stop address       = 0x%x.", stop_address);
 579         sr_info("Now address        = 0x%x.", now_address);
 580         sr_info("Trigger address    = 0x%x.", trigger_address);
 581         sr_info("Triggerbar address = 0x%x.", triggerbar);
 582         sr_info("Ramsize trigger    = 0x%x.", ramsize_trigger);
 583         sr_info("Memory size        = 0x%x.", memory_size);
 584
 585         /* Send header packet to the session bus. */
 586         std_session_send_df_header(cb_data, LOG_PREFIX);
 587
 588         /* Check for empty capture */
 589         if ((status & STATUS_READY) && !stop_address) {
 590                 packet.type = SR_DF_END;
 591                 sr_session_send(cb_data, &packet);
 592                 return SR_OK;
 593         }
 594
 595         if (!(buf = g_try_malloc(PACKET_SIZE))) {
 596                 sr_err("Packet buffer malloc failed.");
 597                 return SR_ERR_MALLOC;
 598         }
 599
 600         /* Check if the trigger is in the samples we are throwing away */
 601         trigger_now = now_address == trigger_address ||
 602                 ((now_address + 1) % memory_size) == trigger_address;
 603
 604         /*
 605          * STATUS_READY doesn't clear until now_address advances past
 606          * addr 0, but for our logic, clear it in that case
 607          */
 608         if (!now_address)
 609                 status &= ~STATUS_READY;
 610
 611         analyzer_read_start(usb->devhdl);
 612
 613         /* Calculate how much data to discard */
 614         discard = 0;
 615         if (status & STATUS_READY) {
 616                 /*
 617                  * We haven't wrapped around, we need to throw away data from
 618                  * our current position to the end of the buffer.
 619                  * Additionally, the first two samples captured are always
 620                  * bogus.
 621                  */
 622                 discard += memory_size - now_address + 2;
 623                 now_address = 2;
 624         }
 625
 626         /* If we have more samples than we need, discard them */
 627         valid_samples = (stop_address - now_address) % memory_size;
 628         if (valid_samples > ramsize_trigger + triggerbar) {
 629                 discard += valid_samples - (ramsize_trigger + triggerbar);
 630                 now_address += valid_samples - (ramsize_trigger + triggerbar);
 631         }
 632
 633         sr_info("Need to discard %d samples.", discard);
 634
 635         /* Calculate how far in the trigger is */
 636         if (trigger_now)
 637                 trigger_offset = 0;
 638         else
 639                 trigger_offset = (trigger_address - now_address) % memory_size;
 640
 641         /* Recalculate the number of samples available */
 642         valid_samples = (stop_address - now_address) % memory_size;
 643
 644         /* Send the incoming transfer to the session bus. */
 645         samples_read = 0;
 646         for (packet_num = 0; packet_num < n / PACKET_SIZE; packet_num++) {
 647                 unsigned int len;
 648                 unsigned int buf_offset;
 649
 650                 res = analyzer_read_data(usb->devhdl, buf, PACKET_SIZE);
 651                 sr_info("Tried to read %d bytes, actually read %d bytes.",
 652                         PACKET_SIZE, res);
 653
 654                 if (discard >= PACKET_SIZE / 4) {
 655                         discard -= PACKET_SIZE / 4;
 656                         continue;
 657                 }
 658
 659                 len = PACKET_SIZE - discard * 4;
 660                 buf_offset = discard * 4;
 661                 discard = 0;
 662
 663                 /* Check if we've read all the samples */
 664                 if (samples_read + len / 4 >= valid_samples)
 665                         len = (valid_samples - samples_read) * 4;
 666                 if (!len)
 667                         break;
 668
 669                 if (samples_read < trigger_offset &&
 670                     samples_read + len / 4 > trigger_offset) {
 671                         /* Send out samples remaining before trigger */
 672                         packet.type = SR_DF_LOGIC;
 673                         packet.payload = &logic;
 674                         logic.length = (trigger_offset - samples_read) * 4;
 675                         logic.unitsize = 4;
 676                         logic.data = buf + buf_offset;
 677                         sr_session_send(cb_data, &packet);
 678                         len -= logic.length;
 679                         samples_read += logic.length / 4;
 680                         buf_offset += logic.length;
 681                 }
 682
 683                 if (samples_read == trigger_offset) {
 684                         /* Send out trigger */
 685                         packet.type = SR_DF_TRIGGER;
 686                         packet.payload = NULL;
 687                         sr_session_send(cb_data, &packet);
 688                 }
 689
 690                 /* Send out data (or data after trigger) */
 691                 packet.type = SR_DF_LOGIC;
 692                 packet.payload = &logic;
 693                 logic.length = len;
 694                 logic.unitsize = 4;
 695                 logic.data = buf + buf_offset;
 696                 sr_session_send(cb_data, &packet);
 697                 samples_read += len / 4;
 698         }
 699         analyzer_read_stop(usb->devhdl);
 700         g_free(buf);
 701
 702         packet.type = SR_DF_END;
 703         sr_session_send(cb_data, &packet);
 704
 705         return SR_OK;
 706 }
 707
 708 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 709 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 710 {
 711         struct dev_context *devc;
 712         struct sr_usb_dev_inst *usb;
 713         struct sr_datafeed_packet packet;
 714
 715         packet.type = SR_DF_END;
 716         sr_session_send(cb_data, &packet);
 717
 718         if (!(devc = sdi->priv)) {
 719                 sr_err("%s: sdi->priv was NULL", __func__);
 720                 return SR_ERR_BUG;
 721         }
 722
 723         usb = sdi->conn;
 724         analyzer_reset(usb->devhdl);
 725         /* TODO: Need to cancel and free any queued up transfers. */
 726
 727         return SR_OK;
 728 }
 729
 730 SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info = {
 731         .name = "zeroplus-logic-cube",
 732         .longname = "ZEROPLUS Logic Cube LAP-C series",
 733         .api_version = 1,
 734         .init = init,
 735         .cleanup = cleanup,
 736         .scan = scan,
 737         .dev_list = dev_list,
 738         .dev_clear = NULL,
 739         .config_get = config_get,
 740         .config_set = config_set,
 741         .config_list = config_list,
 742         .dev_open = dev_open,
 743         .dev_close = dev_close,
 744         .dev_acquisition_start = dev_acquisition_start,
 745         .dev_acquisition_stop = dev_acquisition_stop,
 746         .priv = NULL,
 747 };