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         { 0, 0, 0, 0, 0, 0 }
  53 };
  54
  55 static const int32_t hwcaps[] = {
  56         SR_CONF_LOGIC_ANALYZER,
  57         SR_CONF_SAMPLERATE,
  58         SR_CONF_TRIGGER_MATCH,
  59         SR_CONF_CAPTURE_RATIO,
  60         SR_CONF_VOLTAGE_THRESHOLD,
  61         SR_CONF_LIMIT_SAMPLES,
  62 };
  63
  64 static const int32_t trigger_matches[] = {
  65         SR_TRIGGER_ZERO,
  66         SR_TRIGGER_ONE,
  67 };
  68
  69 /*
  70  * ZEROPLUS LAP-C (16032) numbers the 16 channels A0-A7 and B0-B7.
  71  * We currently ignore other untested/unsupported devices here.
  72  */
  73 static const char *channel_names[] = {
  74         "A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7",
  75         "B0", "B1", "B2", "B3", "B4", "B5", "B6", "B7",
  76         "C0", "C1", "C2", "C3", "C4", "C5", "C6", "C7",
  77         "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",
  78         NULL,
  79 };
  80
  81 SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info;
  82 static struct sr_dev_driver *di = &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_context *sr_ctx)
 159 {
 160         return std_init(sr_ctx, di, LOG_PREFIX);
 161 }
 162
 163 static GSList *scan(GSList *options)
 164 {
 165         struct sr_dev_inst *sdi;
 166         struct sr_channel *ch;
 167         struct drv_context *drvc;
 168         struct dev_context *devc;
 169         const struct zp_model *prof;
 170         struct libusb_device_descriptor des;
 171         libusb_device **devlist;
 172         GSList *devices;
 173         int ret, devcnt, i, j;
 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         devcnt = 0;
 183         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist); /* TODO: Errors. */
 184
 185         for (i = 0; devlist[i]; i++) {
 186                 ret = libusb_get_device_descriptor(devlist[i], &des);
 187                 if (ret != 0) {
 188                         sr_err("Failed to get device descriptor: %s.",
 189                                libusb_error_name(ret));
 190                         continue;
 191                 }
 192
 193                 prof = NULL;
 194                 for (j = 0; j < zeroplus_models[j].vid; j++) {
 195                         if (des.idVendor == zeroplus_models[j].vid &&
 196                                 des.idProduct == zeroplus_models[j].pid) {
 197                                 prof = &zeroplus_models[j];
 198                         }
 199                 }
 200                 /* Skip if the device was not found. */
 201                 if (!prof)
 202                         continue;
 203                 sr_info("Found ZEROPLUS %s.", prof->model_name);
 204
 205                 /* Register the device with libsigrok. */
 206                 if (!(sdi = sr_dev_inst_new(devcnt, SR_ST_INACTIVE,
 207                                 VENDOR_NAME, prof->model_name, NULL))) {
 208                         sr_err("%s: sr_dev_inst_new failed", __func__);
 209                         return NULL;
 210                 }
 211                 sdi->driver = di;
 212
 213                 /* Allocate memory for our private driver context. */
 214                 if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
 215                         sr_err("Device context malloc failed.");
 216                         return NULL;
 217                 }
 218
 219                 sdi->priv = devc;
 220                 devc->prof = prof;
 221                 devc->num_channels = prof->channels;
 222 #ifdef ZP_EXPERIMENTAL
 223                 devc->max_sample_depth = 128 * 1024;
 224                 devc->max_samplerate = 200;
 225 #else
 226                 devc->max_sample_depth = prof->sample_depth * 1024;
 227                 devc->max_samplerate = prof->max_sampling_freq;
 228 #endif
 229                 devc->max_samplerate *= SR_MHZ(1);
 230                 devc->memory_size = MEMORY_SIZE_8K;
 231                 // memset(devc->trigger_buffer, 0, NUM_TRIGGER_STAGES);
 232
 233                 /* Fill in channellist according to this device's profile. */
 234                 for (j = 0; j < devc->num_channels; j++) {
 235                         if (!(ch = sr_channel_new(j, SR_CHANNEL_LOGIC, TRUE,
 236                                         channel_names[j])))
 237                                 return NULL;
 238                         sdi->channels = g_slist_append(sdi->channels, ch);
 239                 }
 240
 241                 devices = g_slist_append(devices, sdi);
 242                 drvc->instances = g_slist_append(drvc->instances, sdi);
 243                 sdi->inst_type = SR_INST_USB;
 244                 sdi->conn = sr_usb_dev_inst_new(
 245                         libusb_get_bus_number(devlist[i]),
 246                         libusb_get_device_address(devlist[i]), NULL);
 247                 devcnt++;
 248
 249         }
 250         libusb_free_device_list(devlist, 1);
 251
 252         return devices;
 253 }
 254
 255 static GSList *dev_list(void)
 256 {
 257         return ((struct drv_context *)(di->priv))->instances;
 258 }
 259
 260 static int dev_open(struct sr_dev_inst *sdi)
 261 {
 262         struct dev_context *devc;
 263         struct drv_context *drvc;
 264         struct sr_usb_dev_inst *usb;
 265         libusb_device **devlist, *dev;
 266         struct libusb_device_descriptor des;
 267         int device_count, ret, i;
 268
 269         drvc = di->priv;
 270         usb = sdi->conn;
 271
 272         if (!(devc = sdi->priv)) {
 273                 sr_err("%s: sdi->priv was NULL", __func__);
 274                 return SR_ERR_ARG;
 275         }
 276
 277         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx,
 278                                               &devlist);
 279         if (device_count < 0) {
 280                 sr_err("Failed to retrieve device list.");
 281                 return SR_ERR;
 282         }
 283
 284         dev = NULL;
 285         for (i = 0; i < device_count; i++) {
 286                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 287                         sr_err("Failed to get device descriptor: %s.",
 288                                libusb_error_name(ret));
 289                         continue;
 290                 }
 291                 if (libusb_get_bus_number(devlist[i]) == usb->bus
 292                     && libusb_get_device_address(devlist[i]) == usb->address) {
 293                         dev = devlist[i];
 294                         break;
 295                 }
 296         }
 297         if (!dev) {
 298                 sr_err("Device on bus %d address %d disappeared!",
 299                        usb->bus, usb->address);
 300                 return SR_ERR;
 301         }
 302
 303         if (!(ret = libusb_open(dev, &(usb->devhdl)))) {
 304                 sdi->status = SR_ST_ACTIVE;
 305                 sr_info("Opened device %d on %d.%d interface %d.",
 306                         sdi->index, usb->bus, usb->address, USB_INTERFACE);
 307         } else {
 308                 sr_err("Failed to open device: %s.", libusb_error_name(ret));
 309                 return SR_ERR;
 310         }
 311
 312         ret = libusb_set_configuration(usb->devhdl, USB_CONFIGURATION);
 313         if (ret < 0) {
 314                 sr_err("Unable to set USB configuration %d: %s.",
 315                        USB_CONFIGURATION, libusb_error_name(ret));
 316                 return SR_ERR;
 317         }
 318
 319         ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 320         if (ret != 0) {
 321                 sr_err("Unable to claim interface: %s.",
 322                        libusb_error_name(ret));
 323                 return SR_ERR;
 324         }
 325
 326         /* Set default configuration after power on. */
 327         if (analyzer_read_status(usb->devhdl) == 0)
 328                 analyzer_configure(usb->devhdl);
 329
 330         analyzer_reset(usb->devhdl);
 331         analyzer_initialize(usb->devhdl);
 332
 333         //analyzer_set_memory_size(MEMORY_SIZE_512K);
 334         // analyzer_set_freq(g_freq, g_freq_scale);
 335         analyzer_set_trigger_count(1);
 336         // analyzer_set_ramsize_trigger_address((((100 - g_pre_trigger)
 337         // * get_memory_size(g_memory_size)) / 100) >> 2);
 338
 339 #if 0
 340         if (g_double_mode == 1)
 341                 analyzer_set_compression(COMPRESSION_DOUBLE);
 342         else if (g_compression == 1)
 343                 analyzer_set_compression(COMPRESSION_ENABLE);
 344         else
 345 #endif
 346         analyzer_set_compression(COMPRESSION_NONE);
 347
 348         if (devc->cur_samplerate == 0) {
 349                 /* Samplerate hasn't been set. Default to 1MHz. */
 350                 analyzer_set_freq(1, FREQ_SCALE_MHZ);
 351                 devc->cur_samplerate = SR_MHZ(1);
 352         }
 353
 354         if (devc->cur_threshold == 0)
 355                 set_voltage_threshold(devc, 1.5);
 356
 357         return SR_OK;
 358 }
 359
 360 static int dev_close(struct sr_dev_inst *sdi)
 361 {
 362         struct sr_usb_dev_inst *usb;
 363
 364         usb = sdi->conn;
 365
 366         if (!usb->devhdl)
 367                 return SR_ERR;
 368
 369         sr_info("Closing device %d on %d.%d interface %d.", sdi->index,
 370                 usb->bus, usb->address, USB_INTERFACE);
 371         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 372         libusb_reset_device(usb->devhdl);
 373         libusb_close(usb->devhdl);
 374         usb->devhdl = NULL;
 375         sdi->status = SR_ST_INACTIVE;
 376
 377         return SR_OK;
 378 }
 379
 380 static int cleanup(void)
 381 {
 382         return std_dev_clear(di, NULL);
 383 }
 384
 385 static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi,
 386                 const struct sr_channel_group *cg)
 387 {
 388         struct dev_context *devc;
 389
 390         (void)cg;
 391
 392         switch (id) {
 393         case SR_CONF_SAMPLERATE:
 394                 if (sdi) {
 395                         devc = sdi->priv;
 396                         *data = g_variant_new_uint64(devc->cur_samplerate);
 397                         sr_spew("Returning samplerate: %" PRIu64 "Hz.",
 398                                 devc->cur_samplerate);
 399                 } else
 400                         return SR_ERR_ARG;
 401                 break;
 402         case SR_CONF_CAPTURE_RATIO:
 403                 if (sdi) {
 404                         devc = sdi->priv;
 405                         *data = g_variant_new_uint64(devc->capture_ratio);
 406                 } else
 407                         return SR_ERR_ARG;
 408                 break;
 409         case SR_CONF_VOLTAGE_THRESHOLD:
 410                 if (sdi) {
 411                         GVariant *range[2];
 412                         devc = sdi->priv;
 413                         range[0] = g_variant_new_double(devc->cur_threshold);
 414                         range[1] = g_variant_new_double(devc->cur_threshold);
 415                         *data = g_variant_new_tuple(range, 2);
 416                 } else
 417                         return SR_ERR_ARG;
 418                 break;
 419         default:
 420                 return SR_ERR_NA;
 421         }
 422
 423         return SR_OK;
 424 }
 425
 426 static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi,
 427                 const struct sr_channel_group *cg)
 428 {
 429         struct dev_context *devc;
 430         gdouble low, high;
 431
 432         (void)cg;
 433
 434         if (sdi->status != SR_ST_ACTIVE)
 435                 return SR_ERR_DEV_CLOSED;
 436
 437         if (!(devc = sdi->priv)) {
 438                 sr_err("%s: sdi->priv was NULL", __func__);
 439                 return SR_ERR_ARG;
 440         }
 441
 442         switch (id) {
 443         case SR_CONF_SAMPLERATE:
 444                 return zp_set_samplerate(devc, g_variant_get_uint64(data));
 445         case SR_CONF_LIMIT_SAMPLES:
 446                 return set_limit_samples(devc, g_variant_get_uint64(data));
 447         case SR_CONF_CAPTURE_RATIO:
 448                 return set_capture_ratio(devc, g_variant_get_uint64(data));
 449         case SR_CONF_VOLTAGE_THRESHOLD:
 450                 g_variant_get(data, "(dd)", &low, &high);
 451                 return set_voltage_threshold(devc, (low + high) / 2.0);
 452         default:
 453                 return SR_ERR_NA;
 454         }
 455
 456         return SR_OK;
 457 }
 458
 459 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi,
 460                 const struct sr_channel_group *cg)
 461 {
 462         struct dev_context *devc;
 463         GVariant *gvar, *grange[2];
 464         GVariantBuilder gvb;
 465         double v;
 466         GVariant *range[2];
 467
 468         (void)cg;
 469
 470         switch (key) {
 471         case SR_CONF_DEVICE_OPTIONS:
 472                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 473                                 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
 474                 break;
 475         case SR_CONF_SAMPLERATE:
 476                 devc = sdi->priv;
 477                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 478                 if (devc->prof->max_sampling_freq == 100) {
 479                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 480                                         samplerates_100, ARRAY_SIZE(samplerates_100),
 481                                         sizeof(uint64_t));
 482                 } else if (devc->prof->max_sampling_freq == 200) {
 483                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 484                                         samplerates_200, ARRAY_SIZE(samplerates_200),
 485                                         sizeof(uint64_t));
 486                 } else {
 487                         sr_err("Internal error: Unknown max. samplerate: %d.",
 488                                devc->prof->max_sampling_freq);
 489                         return SR_ERR_ARG;
 490                 }
 491                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 492                 *data = g_variant_builder_end(&gvb);
 493                 break;
 494         case SR_CONF_TRIGGER_MATCH:
 495                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 496                                 trigger_matches, ARRAY_SIZE(trigger_matches),
 497                                 sizeof(int32_t));
 498                 break;
 499         case SR_CONF_VOLTAGE_THRESHOLD:
 500                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 501                 for (v = -6.0; v <= 6.0; v += 0.1) {
 502                         range[0] = g_variant_new_double(v);
 503                         range[1] = g_variant_new_double(v);
 504                         gvar = g_variant_new_tuple(range, 2);
 505                         g_variant_builder_add_value(&gvb, gvar);
 506                 }
 507                 *data = g_variant_builder_end(&gvb);
 508                 break;
 509         case SR_CONF_LIMIT_SAMPLES:
 510                 if (!sdi)
 511                         return SR_ERR_ARG;
 512                 devc = sdi->priv;
 513                 grange[0] = g_variant_new_uint64(0);
 514                 grange[1] = g_variant_new_uint64(devc->max_sample_depth);
 515                 *data = g_variant_new_tuple(grange, 2);
 516                 break;
 517         default:
 518                 return SR_ERR_NA;
 519         }
 520
 521         return SR_OK;
 522 }
 523
 524 static int dev_acquisition_start(const struct sr_dev_inst *sdi,
 525                 void *cb_data)
 526 {
 527         struct dev_context *devc;
 528         struct sr_usb_dev_inst *usb;
 529         struct sr_datafeed_packet packet;
 530         struct sr_datafeed_logic logic;
 531         unsigned int samples_read;
 532         int res;
 533         unsigned int packet_num, n;
 534         unsigned char *buf;
 535         unsigned int status;
 536         unsigned int stop_address;
 537         unsigned int now_address;
 538         unsigned int trigger_address;
 539         unsigned int trigger_offset;
 540         unsigned int triggerbar;
 541         unsigned int ramsize_trigger;
 542         unsigned int memory_size;
 543         unsigned int valid_samples;
 544         unsigned int discard;
 545         int trigger_now;
 546
 547         if (sdi->status != SR_ST_ACTIVE)
 548                 return SR_ERR_DEV_CLOSED;
 549
 550         if (!(devc = sdi->priv)) {
 551                 sr_err("%s: sdi->priv was NULL", __func__);
 552                 return SR_ERR_ARG;
 553         }
 554
 555         if (analyzer_add_triggers(sdi) != SR_OK) {
 556                 sr_err("Failed to configure triggers.");
 557                 return SR_ERR;
 558         }
 559
 560         usb = sdi->conn;
 561
 562         set_triggerbar(devc);
 563
 564         /* Push configured settings to device. */
 565         analyzer_configure(usb->devhdl);
 566
 567         analyzer_start(usb->devhdl);
 568         sr_info("Waiting for data.");
 569         analyzer_wait_data(usb->devhdl);
 570
 571         status = analyzer_read_status(usb->devhdl);
 572         stop_address = analyzer_get_stop_address(usb->devhdl);
 573         now_address = analyzer_get_now_address(usb->devhdl);
 574         trigger_address = analyzer_get_trigger_address(usb->devhdl);
 575
 576         triggerbar = analyzer_get_triggerbar_address();
 577         ramsize_trigger = analyzer_get_ramsize_trigger_address();
 578
 579         n = get_memory_size(devc->memory_size);
 580         memory_size = n / 4;
 581
 582         sr_info("Status = 0x%x.", status);
 583         sr_info("Stop address       = 0x%x.", stop_address);
 584         sr_info("Now address        = 0x%x.", now_address);
 585         sr_info("Trigger address    = 0x%x.", trigger_address);
 586         sr_info("Triggerbar address = 0x%x.", triggerbar);
 587         sr_info("Ramsize trigger    = 0x%x.", ramsize_trigger);
 588         sr_info("Memory size        = 0x%x.", memory_size);
 589
 590         /* Send header packet to the session bus. */
 591         std_session_send_df_header(cb_data, LOG_PREFIX);
 592
 593         /* Check for empty capture */
 594         if ((status & STATUS_READY) && !stop_address) {
 595                 packet.type = SR_DF_END;
 596                 sr_session_send(cb_data, &packet);
 597                 return SR_OK;
 598         }
 599
 600         if (!(buf = g_try_malloc(PACKET_SIZE))) {
 601                 sr_err("Packet buffer malloc failed.");
 602                 return SR_ERR_MALLOC;
 603         }
 604
 605         /* Check if the trigger is in the samples we are throwing away */
 606         trigger_now = now_address == trigger_address ||
 607                 ((now_address + 1) % memory_size) == trigger_address;
 608
 609         /*
 610          * STATUS_READY doesn't clear until now_address advances past
 611          * addr 0, but for our logic, clear it in that case
 612          */
 613         if (!now_address)
 614                 status &= ~STATUS_READY;
 615
 616         analyzer_read_start(usb->devhdl);
 617
 618         /* Calculate how much data to discard */
 619         discard = 0;
 620         if (status & STATUS_READY) {
 621                 /*
 622                  * We haven't wrapped around, we need to throw away data from
 623                  * our current position to the end of the buffer.
 624                  * Additionally, the first two samples captured are always
 625                  * bogus.
 626                  */
 627                 discard += memory_size - now_address + 2;
 628                 now_address = 2;
 629         }
 630
 631         /* If we have more samples than we need, discard them */
 632         valid_samples = (stop_address - now_address) % memory_size;
 633         if (valid_samples > ramsize_trigger + triggerbar) {
 634                 discard += valid_samples - (ramsize_trigger + triggerbar);
 635                 now_address += valid_samples - (ramsize_trigger + triggerbar);
 636         }
 637
 638         sr_info("Need to discard %d samples.", discard);
 639
 640         /* Calculate how far in the trigger is */
 641         if (trigger_now)
 642                 trigger_offset = 0;
 643         else
 644                 trigger_offset = (trigger_address - now_address) % memory_size;
 645
 646         /* Recalculate the number of samples available */
 647         valid_samples = (stop_address - now_address) % memory_size;
 648
 649         /* Send the incoming transfer to the session bus. */
 650         samples_read = 0;
 651         for (packet_num = 0; packet_num < n / PACKET_SIZE; packet_num++) {
 652                 unsigned int len;
 653                 unsigned int buf_offset;
 654
 655                 res = analyzer_read_data(usb->devhdl, buf, PACKET_SIZE);
 656                 sr_info("Tried to read %d bytes, actually read %d bytes.",
 657                         PACKET_SIZE, res);
 658
 659                 if (discard >= PACKET_SIZE / 4) {
 660                         discard -= PACKET_SIZE / 4;
 661                         continue;
 662                 }
 663
 664                 len = PACKET_SIZE - discard * 4;
 665                 buf_offset = discard * 4;
 666                 discard = 0;
 667
 668                 /* Check if we've read all the samples */
 669                 if (samples_read + len / 4 >= valid_samples)
 670                         len = (valid_samples - samples_read) * 4;
 671                 if (!len)
 672                         break;
 673
 674                 if (samples_read < trigger_offset &&
 675                     samples_read + len / 4 > trigger_offset) {
 676                         /* Send out samples remaining before trigger */
 677                         packet.type = SR_DF_LOGIC;
 678                         packet.payload = &logic;
 679                         logic.length = (trigger_offset - samples_read) * 4;
 680                         logic.unitsize = 4;
 681                         logic.data = buf + buf_offset;
 682                         sr_session_send(cb_data, &packet);
 683                         len -= logic.length;
 684                         samples_read += logic.length / 4;
 685                         buf_offset += logic.length;
 686                 }
 687
 688                 if (samples_read == trigger_offset) {
 689                         /* Send out trigger */
 690                         packet.type = SR_DF_TRIGGER;
 691                         packet.payload = NULL;
 692                         sr_session_send(cb_data, &packet);
 693                 }
 694
 695                 /* Send out data (or data after trigger) */
 696                 packet.type = SR_DF_LOGIC;
 697                 packet.payload = &logic;
 698                 logic.length = len;
 699                 logic.unitsize = 4;
 700                 logic.data = buf + buf_offset;
 701                 sr_session_send(cb_data, &packet);
 702                 samples_read += len / 4;
 703         }
 704         analyzer_read_stop(usb->devhdl);
 705         g_free(buf);
 706
 707         packet.type = SR_DF_END;
 708         sr_session_send(cb_data, &packet);
 709
 710         return SR_OK;
 711 }
 712
 713 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 714 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 715 {
 716         struct dev_context *devc;
 717         struct sr_usb_dev_inst *usb;
 718         struct sr_datafeed_packet packet;
 719
 720         packet.type = SR_DF_END;
 721         sr_session_send(cb_data, &packet);
 722
 723         if (!(devc = sdi->priv)) {
 724                 sr_err("%s: sdi->priv was NULL", __func__);
 725                 return SR_ERR_BUG;
 726         }
 727
 728         usb = sdi->conn;
 729         analyzer_reset(usb->devhdl);
 730         /* TODO: Need to cancel and free any queued up transfers. */
 731
 732         return SR_OK;
 733 }
 734
 735 SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info = {
 736         .name = "zeroplus-logic-cube",
 737         .longname = "ZEROPLUS Logic Cube LAP-C series",
 738         .api_version = 1,
 739         .init = init,
 740         .cleanup = cleanup,
 741         .scan = scan,
 742         .dev_list = dev_list,
 743         .dev_clear = NULL,
 744         .config_get = config_get,
 745         .config_set = config_set,
 746         .config_list = config_list,
 747         .dev_open = dev_open,
 748         .dev_close = dev_close,
 749         .dev_acquisition_start = dev_acquisition_start,
 750         .dev_acquisition_stop = dev_acquisition_stop,
 751         .priv = NULL,
 752 };