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 = g_malloc0(sizeof(struct sr_dev_inst));
 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                 devc = g_malloc0(sizeof(struct dev_context));
 235                 sdi->priv = devc;
 236                 devc->prof = prof;
 237                 devc->num_channels = prof->channels;
 238 #ifdef ZP_EXPERIMENTAL
 239                 devc->max_sample_depth = 128 * 1024;
 240                 devc->max_samplerate = 200;
 241 #else
 242                 devc->max_sample_depth = prof->sample_depth * 1024;
 243                 devc->max_samplerate = prof->max_sampling_freq;
 244 #endif
 245                 devc->max_samplerate *= SR_MHZ(1);
 246                 devc->memory_size = MEMORY_SIZE_8K;
 247                 // memset(devc->trigger_buffer, 0, NUM_TRIGGER_STAGES);
 248
 249                 /* Fill in channellist according to this device's profile. */
 250                 for (j = 0; j < devc->num_channels; j++) {
 251                         ch = sr_channel_new(j, SR_CHANNEL_LOGIC, TRUE,
 252                                         channel_names[j]);
 253                         sdi->channels = g_slist_append(sdi->channels, ch);
 254                 }
 255
 256                 devices = g_slist_append(devices, sdi);
 257                 drvc->instances = g_slist_append(drvc->instances, sdi);
 258                 sdi->inst_type = SR_INST_USB;
 259                 sdi->conn = sr_usb_dev_inst_new(
 260                         libusb_get_bus_number(devlist[i]),
 261                         libusb_get_device_address(devlist[i]), NULL);
 262         }
 263         libusb_free_device_list(devlist, 1);
 264
 265         return devices;
 266 }
 267
 268 static GSList *dev_list(void)
 269 {
 270         return ((struct drv_context *)(di->priv))->instances;
 271 }
 272
 273 static int dev_open(struct sr_dev_inst *sdi)
 274 {
 275         struct dev_context *devc;
 276         struct drv_context *drvc;
 277         struct sr_usb_dev_inst *usb;
 278         libusb_device **devlist, *dev;
 279         int device_count, ret, i;
 280         char connection_id[64];
 281
 282         drvc = di->priv;
 283         usb = sdi->conn;
 284
 285         if (!(devc = sdi->priv)) {
 286                 sr_err("%s: sdi->priv was NULL", __func__);
 287                 return SR_ERR_ARG;
 288         }
 289
 290         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx,
 291                                               &devlist);
 292         if (device_count < 0) {
 293                 sr_err("Failed to retrieve device list.");
 294                 return SR_ERR;
 295         }
 296
 297         dev = NULL;
 298         for (i = 0; i < device_count; i++) {
 299                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 300                 if (!strcmp(sdi->connection_id, connection_id)) {
 301                         dev = devlist[i];
 302                         break;
 303                 }
 304         }
 305         if (!dev) {
 306                 sr_err("Device on %d.%d (logical) / %s (physical) disappeared!",
 307                        usb->bus, usb->address, sdi->connection_id);
 308                 return SR_ERR;
 309         }
 310
 311         if (!(ret = libusb_open(dev, &(usb->devhdl)))) {
 312                 sdi->status = SR_ST_ACTIVE;
 313                 sr_info("Opened device on %d.%d (logical) / %s (physical) interface %d.",
 314                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 315         } else {
 316                 sr_err("Failed to open device: %s.", libusb_error_name(ret));
 317                 return SR_ERR;
 318         }
 319
 320         ret = libusb_set_configuration(usb->devhdl, USB_CONFIGURATION);
 321         if (ret < 0) {
 322                 sr_err("Unable to set USB configuration %d: %s.",
 323                        USB_CONFIGURATION, libusb_error_name(ret));
 324                 return SR_ERR;
 325         }
 326
 327         ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 328         if (ret != 0) {
 329                 sr_err("Unable to claim interface: %s.",
 330                        libusb_error_name(ret));
 331                 return SR_ERR;
 332         }
 333
 334         /* Set default configuration after power on. */
 335         if (analyzer_read_status(usb->devhdl) == 0)
 336                 analyzer_configure(usb->devhdl);
 337
 338         analyzer_reset(usb->devhdl);
 339         analyzer_initialize(usb->devhdl);
 340
 341         //analyzer_set_memory_size(MEMORY_SIZE_512K);
 342         // analyzer_set_freq(g_freq, g_freq_scale);
 343         analyzer_set_trigger_count(1);
 344         // analyzer_set_ramsize_trigger_address((((100 - g_pre_trigger)
 345         // * get_memory_size(g_memory_size)) / 100) >> 2);
 346
 347 #if 0
 348         if (g_double_mode == 1)
 349                 analyzer_set_compression(COMPRESSION_DOUBLE);
 350         else if (g_compression == 1)
 351                 analyzer_set_compression(COMPRESSION_ENABLE);
 352         else
 353 #endif
 354         analyzer_set_compression(COMPRESSION_NONE);
 355
 356         if (devc->cur_samplerate == 0) {
 357                 /* Samplerate hasn't been set. Default to 1MHz. */
 358                 analyzer_set_freq(1, FREQ_SCALE_MHZ);
 359                 devc->cur_samplerate = SR_MHZ(1);
 360         }
 361
 362         if (devc->cur_threshold == 0)
 363                 set_voltage_threshold(devc, 1.5);
 364
 365         return SR_OK;
 366 }
 367
 368 static int dev_close(struct sr_dev_inst *sdi)
 369 {
 370         struct sr_usb_dev_inst *usb;
 371
 372         usb = sdi->conn;
 373
 374         if (!usb->devhdl)
 375                 return SR_ERR;
 376
 377         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 378                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 379         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 380         libusb_reset_device(usb->devhdl);
 381         libusb_close(usb->devhdl);
 382         usb->devhdl = NULL;
 383         sdi->status = SR_ST_INACTIVE;
 384
 385         return SR_OK;
 386 }
 387
 388 static int cleanup(void)
 389 {
 390         return std_dev_clear(di, NULL);
 391 }
 392
 393 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 394                 const struct sr_channel_group *cg)
 395 {
 396         struct dev_context *devc;
 397
 398         (void)cg;
 399
 400         switch (key) {
 401         case SR_CONF_SAMPLERATE:
 402                 if (sdi) {
 403                         devc = sdi->priv;
 404                         *data = g_variant_new_uint64(devc->cur_samplerate);
 405                         sr_spew("Returning samplerate: %" PRIu64 "Hz.",
 406                                 devc->cur_samplerate);
 407                 } else
 408                         return SR_ERR_ARG;
 409                 break;
 410         case SR_CONF_CAPTURE_RATIO:
 411                 if (sdi) {
 412                         devc = sdi->priv;
 413                         *data = g_variant_new_uint64(devc->capture_ratio);
 414                 } else
 415                         return SR_ERR_ARG;
 416                 break;
 417         case SR_CONF_VOLTAGE_THRESHOLD:
 418                 if (sdi) {
 419                         GVariant *range[2];
 420                         devc = sdi->priv;
 421                         range[0] = g_variant_new_double(devc->cur_threshold);
 422                         range[1] = g_variant_new_double(devc->cur_threshold);
 423                         *data = g_variant_new_tuple(range, 2);
 424                 } else
 425                         return SR_ERR_ARG;
 426                 break;
 427         default:
 428                 return SR_ERR_NA;
 429         }
 430
 431         return SR_OK;
 432 }
 433
 434 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 435                 const struct sr_channel_group *cg)
 436 {
 437         struct dev_context *devc;
 438         gdouble low, high;
 439
 440         (void)cg;
 441
 442         if (sdi->status != SR_ST_ACTIVE)
 443                 return SR_ERR_DEV_CLOSED;
 444
 445         if (!(devc = sdi->priv)) {
 446                 sr_err("%s: sdi->priv was NULL", __func__);
 447                 return SR_ERR_ARG;
 448         }
 449
 450         switch (key) {
 451         case SR_CONF_SAMPLERATE:
 452                 return zp_set_samplerate(devc, g_variant_get_uint64(data));
 453         case SR_CONF_LIMIT_SAMPLES:
 454                 return set_limit_samples(devc, g_variant_get_uint64(data));
 455         case SR_CONF_CAPTURE_RATIO:
 456                 return set_capture_ratio(devc, g_variant_get_uint64(data));
 457         case SR_CONF_VOLTAGE_THRESHOLD:
 458                 g_variant_get(data, "(dd)", &low, &high);
 459                 return set_voltage_threshold(devc, (low + high) / 2.0);
 460         default:
 461                 return SR_ERR_NA;
 462         }
 463
 464         return SR_OK;
 465 }
 466
 467 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 468                 const struct sr_channel_group *cg)
 469 {
 470         struct dev_context *devc;
 471         GVariant *gvar, *grange[2];
 472         GVariantBuilder gvb;
 473         double v;
 474         GVariant *range[2];
 475
 476         (void)cg;
 477
 478         switch (key) {
 479         case SR_CONF_DEVICE_OPTIONS:
 480                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 481                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 482                 break;
 483         case SR_CONF_SAMPLERATE:
 484                 devc = sdi->priv;
 485                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 486                 if (devc->prof->max_sampling_freq == 100) {
 487                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 488                                         samplerates_100, ARRAY_SIZE(samplerates_100),
 489                                         sizeof(uint64_t));
 490                 } else if (devc->prof->max_sampling_freq == 200) {
 491                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 492                                         samplerates_200, ARRAY_SIZE(samplerates_200),
 493                                         sizeof(uint64_t));
 494                 } else {
 495                         sr_err("Internal error: Unknown max. samplerate: %d.",
 496                                devc->prof->max_sampling_freq);
 497                         return SR_ERR_ARG;
 498                 }
 499                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 500                 *data = g_variant_builder_end(&gvb);
 501                 break;
 502         case SR_CONF_TRIGGER_MATCH:
 503                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 504                                 trigger_matches, ARRAY_SIZE(trigger_matches),
 505                                 sizeof(int32_t));
 506                 break;
 507         case SR_CONF_VOLTAGE_THRESHOLD:
 508                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 509                 for (v = -6.0; v <= 6.0; v += 0.1) {
 510                         range[0] = g_variant_new_double(v);
 511                         range[1] = g_variant_new_double(v);
 512                         gvar = g_variant_new_tuple(range, 2);
 513                         g_variant_builder_add_value(&gvb, gvar);
 514                 }
 515                 *data = g_variant_builder_end(&gvb);
 516                 break;
 517         case SR_CONF_LIMIT_SAMPLES:
 518                 if (!sdi)
 519                         return SR_ERR_ARG;
 520                 devc = sdi->priv;
 521                 grange[0] = g_variant_new_uint64(0);
 522                 grange[1] = g_variant_new_uint64(devc->max_sample_depth);
 523                 *data = g_variant_new_tuple(grange, 2);
 524                 break;
 525         default:
 526                 return SR_ERR_NA;
 527         }
 528
 529         return SR_OK;
 530 }
 531
 532 static int dev_acquisition_start(const struct sr_dev_inst *sdi,
 533                 void *cb_data)
 534 {
 535         struct dev_context *devc;
 536         struct sr_usb_dev_inst *usb;
 537         struct sr_datafeed_packet packet;
 538         struct sr_datafeed_logic logic;
 539         unsigned int samples_read;
 540         int res;
 541         unsigned int packet_num, n;
 542         unsigned char *buf;
 543         unsigned int status;
 544         unsigned int stop_address;
 545         unsigned int now_address;
 546         unsigned int trigger_address;
 547         unsigned int trigger_offset;
 548         unsigned int triggerbar;
 549         unsigned int ramsize_trigger;
 550         unsigned int memory_size;
 551         unsigned int valid_samples;
 552         unsigned int discard;
 553         int trigger_now;
 554
 555         if (sdi->status != SR_ST_ACTIVE)
 556                 return SR_ERR_DEV_CLOSED;
 557
 558         if (!(devc = sdi->priv)) {
 559                 sr_err("%s: sdi->priv was NULL", __func__);
 560                 return SR_ERR_ARG;
 561         }
 562
 563         if (analyzer_add_triggers(sdi) != SR_OK) {
 564                 sr_err("Failed to configure triggers.");
 565                 return SR_ERR;
 566         }
 567
 568         usb = sdi->conn;
 569
 570         set_triggerbar(devc);
 571
 572         /* Push configured settings to device. */
 573         analyzer_configure(usb->devhdl);
 574
 575         analyzer_start(usb->devhdl);
 576         sr_info("Waiting for data.");
 577         analyzer_wait_data(usb->devhdl);
 578
 579         status = analyzer_read_status(usb->devhdl);
 580         stop_address = analyzer_get_stop_address(usb->devhdl);
 581         now_address = analyzer_get_now_address(usb->devhdl);
 582         trigger_address = analyzer_get_trigger_address(usb->devhdl);
 583
 584         triggerbar = analyzer_get_triggerbar_address();
 585         ramsize_trigger = analyzer_get_ramsize_trigger_address();
 586
 587         n = get_memory_size(devc->memory_size);
 588         memory_size = n / 4;
 589
 590         sr_info("Status = 0x%x.", status);
 591         sr_info("Stop address       = 0x%x.", stop_address);
 592         sr_info("Now address        = 0x%x.", now_address);
 593         sr_info("Trigger address    = 0x%x.", trigger_address);
 594         sr_info("Triggerbar address = 0x%x.", triggerbar);
 595         sr_info("Ramsize trigger    = 0x%x.", ramsize_trigger);
 596         sr_info("Memory size        = 0x%x.", memory_size);
 597
 598         /* Send header packet to the session bus. */
 599         std_session_send_df_header(cb_data, LOG_PREFIX);
 600
 601         /* Check for empty capture */
 602         if ((status & STATUS_READY) && !stop_address) {
 603                 packet.type = SR_DF_END;
 604                 sr_session_send(cb_data, &packet);
 605                 return SR_OK;
 606         }
 607
 608         if (!(buf = g_try_malloc(PACKET_SIZE))) {
 609                 sr_err("Packet buffer malloc failed.");
 610                 return SR_ERR_MALLOC;
 611         }
 612
 613         /* Check if the trigger is in the samples we are throwing away */
 614         trigger_now = now_address == trigger_address ||
 615                 ((now_address + 1) % memory_size) == trigger_address;
 616
 617         /*
 618          * STATUS_READY doesn't clear until now_address advances past
 619          * addr 0, but for our logic, clear it in that case
 620          */
 621         if (!now_address)
 622                 status &= ~STATUS_READY;
 623
 624         analyzer_read_start(usb->devhdl);
 625
 626         /* Calculate how much data to discard */
 627         discard = 0;
 628         if (status & STATUS_READY) {
 629                 /*
 630                  * We haven't wrapped around, we need to throw away data from
 631                  * our current position to the end of the buffer.
 632                  * Additionally, the first two samples captured are always
 633                  * bogus.
 634                  */
 635                 discard += memory_size - now_address + 2;
 636                 now_address = 2;
 637         }
 638
 639         /* If we have more samples than we need, discard them */
 640         valid_samples = (stop_address - now_address) % memory_size;
 641         if (valid_samples > ramsize_trigger + triggerbar) {
 642                 discard += valid_samples - (ramsize_trigger + triggerbar);
 643                 now_address += valid_samples - (ramsize_trigger + triggerbar);
 644         }
 645
 646         sr_info("Need to discard %d samples.", discard);
 647
 648         /* Calculate how far in the trigger is */
 649         if (trigger_now)
 650                 trigger_offset = 0;
 651         else
 652                 trigger_offset = (trigger_address - now_address) % memory_size;
 653
 654         /* Recalculate the number of samples available */
 655         valid_samples = (stop_address - now_address) % memory_size;
 656
 657         /* Send the incoming transfer to the session bus. */
 658         samples_read = 0;
 659         for (packet_num = 0; packet_num < n / PACKET_SIZE; packet_num++) {
 660                 unsigned int len;
 661                 unsigned int buf_offset;
 662
 663                 res = analyzer_read_data(usb->devhdl, buf, PACKET_SIZE);
 664                 sr_info("Tried to read %d bytes, actually read %d bytes.",
 665                         PACKET_SIZE, res);
 666
 667                 if (discard >= PACKET_SIZE / 4) {
 668                         discard -= PACKET_SIZE / 4;
 669                         continue;
 670                 }
 671
 672                 len = PACKET_SIZE - discard * 4;
 673                 buf_offset = discard * 4;
 674                 discard = 0;
 675
 676                 /* Check if we've read all the samples */
 677                 if (samples_read + len / 4 >= valid_samples)
 678                         len = (valid_samples - samples_read) * 4;
 679                 if (!len)
 680                         break;
 681
 682                 if (samples_read < trigger_offset &&
 683                     samples_read + len / 4 > trigger_offset) {
 684                         /* Send out samples remaining before trigger */
 685                         packet.type = SR_DF_LOGIC;
 686                         packet.payload = &logic;
 687                         logic.length = (trigger_offset - samples_read) * 4;
 688                         logic.unitsize = 4;
 689                         logic.data = buf + buf_offset;
 690                         sr_session_send(cb_data, &packet);
 691                         len -= logic.length;
 692                         samples_read += logic.length / 4;
 693                         buf_offset += logic.length;
 694                 }
 695
 696                 if (samples_read == trigger_offset) {
 697                         /* Send out trigger */
 698                         packet.type = SR_DF_TRIGGER;
 699                         packet.payload = NULL;
 700                         sr_session_send(cb_data, &packet);
 701                 }
 702
 703                 /* Send out data (or data after trigger) */
 704                 packet.type = SR_DF_LOGIC;
 705                 packet.payload = &logic;
 706                 logic.length = len;
 707                 logic.unitsize = 4;
 708                 logic.data = buf + buf_offset;
 709                 sr_session_send(cb_data, &packet);
 710                 samples_read += len / 4;
 711         }
 712         analyzer_read_stop(usb->devhdl);
 713         g_free(buf);
 714
 715         packet.type = SR_DF_END;
 716         sr_session_send(cb_data, &packet);
 717
 718         return SR_OK;
 719 }
 720
 721 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 722 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 723 {
 724         struct dev_context *devc;
 725         struct sr_usb_dev_inst *usb;
 726         struct sr_datafeed_packet packet;
 727
 728         packet.type = SR_DF_END;
 729         sr_session_send(cb_data, &packet);
 730
 731         if (!(devc = sdi->priv)) {
 732                 sr_err("%s: sdi->priv was NULL", __func__);
 733                 return SR_ERR_BUG;
 734         }
 735
 736         usb = sdi->conn;
 737         analyzer_reset(usb->devhdl);
 738         /* TODO: Need to cancel and free any queued up transfers. */
 739
 740         return SR_OK;
 741 }
 742
 743 SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info = {
 744         .name = "zeroplus-logic-cube",
 745         .longname = "ZEROPLUS Logic Cube LAP-C series",
 746         .api_version = 1,
 747         .init = init,
 748         .cleanup = cleanup,
 749         .scan = scan,
 750         .dev_list = dev_list,
 751         .dev_clear = NULL,
 752         .config_get = config_get,
 753         .config_set = config_set,
 754         .config_list = config_list,
 755         .dev_open = dev_open,
 756         .dev_close = dev_close,
 757         .dev_acquisition_start = dev_acquisition_start,
 758         .dev_acquisition_stop = dev_acquisition_stop,
 759         .priv = NULL,
 760 };