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 <config.h>
  21 #include "protocol.h"
  22
  23 #define VENDOR_NAME                     "ZEROPLUS"
  24 #define USB_INTERFACE                   0
  25 #define USB_CONFIGURATION               1
  26 #define NUM_TRIGGER_STAGES              4
  27 #define PACKET_SIZE                     2048    /* ?? */
  28
  29 //#define ZP_EXPERIMENTAL
  30
  31 struct zp_model {
  32         uint16_t vid;
  33         uint16_t pid;
  34         char *model_name;
  35         unsigned int channels;
  36         unsigned int sample_depth;      /* In Ksamples/channel */
  37         unsigned int max_sampling_freq;
  38 };
  39
  40 /*
  41  * Note -- 16032, 16064 and 16128 *usually* -- but not always -- have the
  42  * same 128K sample depth.
  43  */
  44 static const struct zp_model zeroplus_models[] = {
  45         {0x0c12, 0x7002, "LAP-16128U",    16, 128,  200},
  46         {0x0c12, 0x7009, "LAP-C(16064)",  16, 64,   100},
  47         {0x0c12, 0x700a, "LAP-C(16128)",  16, 128,  200},
  48         {0x0c12, 0x700b, "LAP-C(32128)",  32, 128,  200},
  49         {0x0c12, 0x700c, "LAP-C(321000)", 32, 1024, 200},
  50         {0x0c12, 0x700d, "LAP-C(322000)", 32, 2048, 200},
  51         {0x0c12, 0x700e, "LAP-C(16032)",  16, 32,   100},
  52         {0x0c12, 0x7016, "LAP-C(162000)", 16, 2048, 200},
  53         {0x0c12, 0x7100, "AKIP-9101", 16, 256, 200},
  54         { 0, 0, 0, 0, 0, 0 }
  55 };
  56
  57 static const uint32_t devopts[] = {
  58         SR_CONF_LOGIC_ANALYZER,
  59         SR_CONF_LIMIT_SAMPLES | SR_CONF_SET | SR_CONF_LIST,
  60         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  61         SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
  62         SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
  63         SR_CONF_VOLTAGE_THRESHOLD | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  64 };
  65
  66 static const int32_t trigger_matches[] = {
  67         SR_TRIGGER_ZERO,
  68         SR_TRIGGER_ONE,
  69 };
  70
  71 /*
  72  * ZEROPLUS LAP-C (16032) numbers the 16 channels A0-A7 and B0-B7.
  73  * We currently ignore other untested/unsupported devices here.
  74  */
  75 static const char *channel_names[] = {
  76         "A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7",
  77         "B0", "B1", "B2", "B3", "B4", "B5", "B6", "B7",
  78         "C0", "C1", "C2", "C3", "C4", "C5", "C6", "C7",
  79         "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",
  80 };
  81
  82 SR_PRIV struct sr_dev_driver 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_dev_driver *di, struct sr_context *sr_ctx)
 159 {
 160         return std_init(sr_ctx, di, LOG_PREFIX);
 161 }
 162
 163 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 164 {
 165         struct sr_dev_inst *sdi;
 166         struct drv_context *drvc;
 167         struct dev_context *devc;
 168         const struct zp_model *prof;
 169         struct libusb_device_descriptor des;
 170         struct libusb_device_handle *hdl;
 171         libusb_device **devlist;
 172         GSList *devices;
 173         int ret, i, j;
 174         char serial_num[64], connection_id[64];
 175
 176         (void)options;
 177
 178         drvc = di->context;
 179
 180         devices = NULL;
 181
 182         /* Find all ZEROPLUS analyzers and add them to device list. */
 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                 if ((ret = libusb_open(devlist[i], &hdl)) < 0)
 194                         continue;
 195
 196                 if (des.iSerialNumber == 0) {
 197                         serial_num[0] = '\0';
 198                 } else if ((ret = libusb_get_string_descriptor_ascii(hdl,
 199                                 des.iSerialNumber, (unsigned char *) serial_num,
 200                                 sizeof(serial_num))) < 0) {
 201                         sr_warn("Failed to get serial number string descriptor: %s.",
 202                                 libusb_error_name(ret));
 203                         continue;
 204                 }
 205
 206                 libusb_close(hdl);
 207
 208                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 209
 210                 prof = NULL;
 211                 for (j = 0; j < zeroplus_models[j].vid; j++) {
 212                         if (des.idVendor == zeroplus_models[j].vid &&
 213                                 des.idProduct == zeroplus_models[j].pid) {
 214                                 prof = &zeroplus_models[j];
 215                         }
 216                 }
 217                 /* Skip if the device was not found. */
 218                 if (!prof)
 219                         continue;
 220                 sr_info("Found ZEROPLUS %s.", prof->model_name);
 221
 222                 /* Register the device with libsigrok. */
 223                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 224                 sdi->status = SR_ST_INACTIVE;
 225                 sdi->vendor = g_strdup(VENDOR_NAME);
 226                 sdi->model = g_strdup(prof->model_name);
 227                 sdi->driver = di;
 228                 sdi->serial_num = g_strdup(serial_num);
 229                 sdi->connection_id = g_strdup(connection_id);
 230
 231                 /* Allocate memory for our private driver context. */
 232                 devc = g_malloc0(sizeof(struct dev_context));
 233                 sdi->priv = devc;
 234                 devc->prof = prof;
 235                 devc->num_channels = prof->channels;
 236 #ifdef ZP_EXPERIMENTAL
 237                 devc->max_sample_depth = 128 * 1024;
 238                 devc->max_samplerate = 200;
 239 #else
 240                 devc->max_sample_depth = prof->sample_depth * 1024;
 241                 devc->max_samplerate = prof->max_sampling_freq;
 242 #endif
 243                 devc->max_samplerate *= SR_MHZ(1);
 244                 devc->memory_size = MEMORY_SIZE_8K;
 245                 // memset(devc->trigger_buffer, 0, NUM_TRIGGER_STAGES);
 246
 247                 /* Fill in channellist according to this device's profile. */
 248                 for (j = 0; j < devc->num_channels; j++)
 249                         sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE,
 250                                         channel_names[j]);
 251
 252                 devices = g_slist_append(devices, sdi);
 253                 drvc->instances = g_slist_append(drvc->instances, sdi);
 254                 sdi->inst_type = SR_INST_USB;
 255                 sdi->conn = sr_usb_dev_inst_new(
 256                         libusb_get_bus_number(devlist[i]),
 257                         libusb_get_device_address(devlist[i]), NULL);
 258         }
 259         libusb_free_device_list(devlist, 1);
 260
 261         return devices;
 262 }
 263
 264 static GSList *dev_list(const struct sr_dev_driver *di)
 265 {
 266         return ((struct drv_context *)(di->context))->instances;
 267 }
 268
 269 static int dev_open(struct sr_dev_inst *sdi)
 270 {
 271         struct sr_dev_driver *di = sdi->driver;
 272         struct dev_context *devc;
 273         struct drv_context *drvc;
 274         struct sr_usb_dev_inst *usb;
 275         libusb_device **devlist, *dev;
 276         int device_count, ret, i;
 277         char connection_id[64];
 278
 279         drvc = di->context;
 280         usb = sdi->conn;
 281
 282         if (!(devc = sdi->priv)) {
 283                 sr_err("%s: sdi->priv was NULL", __func__);
 284                 return SR_ERR_ARG;
 285         }
 286
 287         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx,
 288                                               &devlist);
 289         if (device_count < 0) {
 290                 sr_err("Failed to retrieve device list.");
 291                 return SR_ERR;
 292         }
 293
 294         dev = NULL;
 295         for (i = 0; i < device_count; i++) {
 296                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 297                 if (!strcmp(sdi->connection_id, connection_id)) {
 298                         dev = devlist[i];
 299                         break;
 300                 }
 301         }
 302         if (!dev) {
 303                 sr_err("Device on %d.%d (logical) / %s (physical) disappeared!",
 304                        usb->bus, usb->address, sdi->connection_id);
 305                 return SR_ERR;
 306         }
 307
 308         if (!(ret = libusb_open(dev, &(usb->devhdl)))) {
 309                 sdi->status = SR_ST_ACTIVE;
 310                 sr_info("Opened device on %d.%d (logical) / %s (physical) interface %d.",
 311                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 312         } else {
 313                 sr_err("Failed to open device: %s.", libusb_error_name(ret));
 314                 return SR_ERR;
 315         }
 316
 317         ret = libusb_set_configuration(usb->devhdl, USB_CONFIGURATION);
 318         if (ret < 0) {
 319                 sr_err("Unable to set USB configuration %d: %s.",
 320                        USB_CONFIGURATION, libusb_error_name(ret));
 321                 return SR_ERR;
 322         }
 323
 324         ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 325         if (ret != 0) {
 326                 sr_err("Unable to claim interface: %s.",
 327                        libusb_error_name(ret));
 328                 return SR_ERR;
 329         }
 330
 331         /* Set default configuration after power on. */
 332         if (analyzer_read_status(usb->devhdl) == 0)
 333                 analyzer_configure(usb->devhdl);
 334
 335         analyzer_reset(usb->devhdl);
 336         analyzer_initialize(usb->devhdl);
 337
 338         //analyzer_set_memory_size(MEMORY_SIZE_512K);
 339         // analyzer_set_freq(g_freq, g_freq_scale);
 340         analyzer_set_trigger_count(1);
 341         // analyzer_set_ramsize_trigger_address((((100 - g_pre_trigger)
 342         // * get_memory_size(g_memory_size)) / 100) >> 2);
 343
 344 #if 0
 345         if (g_double_mode == 1)
 346                 analyzer_set_compression(COMPRESSION_DOUBLE);
 347         else if (g_compression == 1)
 348                 analyzer_set_compression(COMPRESSION_ENABLE);
 349         else
 350 #endif
 351         analyzer_set_compression(COMPRESSION_NONE);
 352
 353         if (devc->cur_samplerate == 0) {
 354                 /* Samplerate hasn't been set. Default to 1MHz. */
 355                 analyzer_set_freq(1, FREQ_SCALE_MHZ);
 356                 devc->cur_samplerate = SR_MHZ(1);
 357         }
 358
 359         if (devc->cur_threshold == 0)
 360                 set_voltage_threshold(devc, 1.5);
 361
 362         return SR_OK;
 363 }
 364
 365 static int dev_close(struct sr_dev_inst *sdi)
 366 {
 367         struct sr_usb_dev_inst *usb;
 368
 369         usb = sdi->conn;
 370
 371         if (!usb->devhdl)
 372                 return SR_ERR;
 373
 374         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 375                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 376         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 377         libusb_reset_device(usb->devhdl);
 378         libusb_close(usb->devhdl);
 379         usb->devhdl = NULL;
 380         sdi->status = SR_ST_INACTIVE;
 381
 382         return SR_OK;
 383 }
 384
 385 static int cleanup(const struct sr_dev_driver *di)
 386 {
 387         return std_dev_clear(di, NULL);
 388 }
 389
 390 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 391                 const struct sr_channel_group *cg)
 392 {
 393         struct dev_context *devc;
 394         GVariant *range[2];
 395
 396         (void)cg;
 397
 398         if (!sdi)
 399                 return SR_ERR_ARG;
 400
 401         devc = sdi->priv;
 402
 403         switch (key) {
 404         case SR_CONF_SAMPLERATE:
 405                 *data = g_variant_new_uint64(devc->cur_samplerate);
 406                 break;
 407         case SR_CONF_CAPTURE_RATIO:
 408                 *data = g_variant_new_uint64(devc->capture_ratio);
 409                 break;
 410         case SR_CONF_VOLTAGE_THRESHOLD:
 411                 range[0] = g_variant_new_double(devc->cur_threshold);
 412                 range[1] = g_variant_new_double(devc->cur_threshold);
 413                 *data = g_variant_new_tuple(range, 2);
 414                 break;
 415         default:
 416                 return SR_ERR_NA;
 417         }
 418
 419         return SR_OK;
 420 }
 421
 422 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 423                 const struct sr_channel_group *cg)
 424 {
 425         struct dev_context *devc;
 426         gdouble low, high;
 427
 428         (void)cg;
 429
 430         if (sdi->status != SR_ST_ACTIVE)
 431                 return SR_ERR_DEV_CLOSED;
 432
 433         if (!(devc = sdi->priv)) {
 434                 sr_err("%s: sdi->priv was NULL", __func__);
 435                 return SR_ERR_ARG;
 436         }
 437
 438         switch (key) {
 439         case SR_CONF_SAMPLERATE:
 440                 return zp_set_samplerate(devc, g_variant_get_uint64(data));
 441         case SR_CONF_LIMIT_SAMPLES:
 442                 return set_limit_samples(devc, g_variant_get_uint64(data));
 443         case SR_CONF_CAPTURE_RATIO:
 444                 return set_capture_ratio(devc, g_variant_get_uint64(data));
 445         case SR_CONF_VOLTAGE_THRESHOLD:
 446                 g_variant_get(data, "(dd)", &low, &high);
 447                 return set_voltage_threshold(devc, (low + high) / 2.0);
 448         default:
 449                 return SR_ERR_NA;
 450         }
 451
 452         return SR_OK;
 453 }
 454
 455 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 456                 const struct sr_channel_group *cg)
 457 {
 458         struct dev_context *devc;
 459         GVariant *gvar, *grange[2];
 460         GVariantBuilder gvb;
 461         double v;
 462         GVariant *range[2];
 463
 464         (void)cg;
 465
 466         switch (key) {
 467         case SR_CONF_DEVICE_OPTIONS:
 468                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 469                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 470                 break;
 471         case SR_CONF_SAMPLERATE:
 472                 devc = sdi->priv;
 473                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 474                 if (devc->prof->max_sampling_freq == 100) {
 475                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 476                                         samplerates_100, ARRAY_SIZE(samplerates_100),
 477                                         sizeof(uint64_t));
 478                 } else if (devc->prof->max_sampling_freq == 200) {
 479                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 480                                         samplerates_200, ARRAY_SIZE(samplerates_200),
 481                                         sizeof(uint64_t));
 482                 } else {
 483                         sr_err("Internal error: Unknown max. samplerate: %d.",
 484                                devc->prof->max_sampling_freq);
 485                         return SR_ERR_ARG;
 486                 }
 487                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 488                 *data = g_variant_builder_end(&gvb);
 489                 break;
 490         case SR_CONF_TRIGGER_MATCH:
 491                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 492                                 trigger_matches, ARRAY_SIZE(trigger_matches),
 493                                 sizeof(int32_t));
 494                 break;
 495         case SR_CONF_VOLTAGE_THRESHOLD:
 496                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 497                 for (v = -6.0; v <= 6.0; v += 0.1) {
 498                         range[0] = g_variant_new_double(v);
 499                         range[1] = g_variant_new_double(v);
 500                         gvar = g_variant_new_tuple(range, 2);
 501                         g_variant_builder_add_value(&gvb, gvar);
 502                 }
 503                 *data = g_variant_builder_end(&gvb);
 504                 break;
 505         case SR_CONF_LIMIT_SAMPLES:
 506                 if (!sdi)
 507                         return SR_ERR_ARG;
 508                 devc = sdi->priv;
 509                 grange[0] = g_variant_new_uint64(0);
 510                 grange[1] = g_variant_new_uint64(devc->max_sample_depth);
 511                 *data = g_variant_new_tuple(grange, 2);
 512                 break;
 513         default:
 514                 return SR_ERR_NA;
 515         }
 516
 517         return SR_OK;
 518 }
 519
 520 static int dev_acquisition_start(const struct sr_dev_inst *sdi,
 521                 void *cb_data)
 522 {
 523         struct dev_context *devc;
 524         struct sr_usb_dev_inst *usb;
 525         struct sr_datafeed_packet packet;
 526         struct sr_datafeed_logic logic;
 527         unsigned int samples_read;
 528         int res;
 529         unsigned int packet_num, n;
 530         unsigned char *buf;
 531         unsigned int status;
 532         unsigned int stop_address;
 533         unsigned int now_address;
 534         unsigned int trigger_address;
 535         unsigned int trigger_offset;
 536         unsigned int triggerbar;
 537         unsigned int ramsize_trigger;
 538         unsigned int memory_size;
 539         unsigned int valid_samples;
 540         unsigned int discard;
 541         int trigger_now;
 542
 543         if (sdi->status != SR_ST_ACTIVE)
 544                 return SR_ERR_DEV_CLOSED;
 545
 546         if (!(devc = sdi->priv)) {
 547                 sr_err("%s: sdi->priv was NULL", __func__);
 548                 return SR_ERR_ARG;
 549         }
 550
 551         if (analyzer_add_triggers(sdi) != SR_OK) {
 552                 sr_err("Failed to configure triggers.");
 553                 return SR_ERR;
 554         }
 555
 556         usb = sdi->conn;
 557
 558         set_triggerbar(devc);
 559
 560         /* Push configured settings to device. */
 561         analyzer_configure(usb->devhdl);
 562
 563         analyzer_start(usb->devhdl);
 564         sr_info("Waiting for data.");
 565         analyzer_wait_data(usb->devhdl);
 566
 567         status = analyzer_read_status(usb->devhdl);
 568         stop_address = analyzer_get_stop_address(usb->devhdl);
 569         now_address = analyzer_get_now_address(usb->devhdl);
 570         trigger_address = analyzer_get_trigger_address(usb->devhdl);
 571
 572         triggerbar = analyzer_get_triggerbar_address();
 573         ramsize_trigger = analyzer_get_ramsize_trigger_address();
 574
 575         n = get_memory_size(devc->memory_size);
 576         memory_size = n / 4;
 577
 578         sr_info("Status = 0x%x.", status);
 579         sr_info("Stop address       = 0x%x.", stop_address);
 580         sr_info("Now address        = 0x%x.", now_address);
 581         sr_info("Trigger address    = 0x%x.", trigger_address);
 582         sr_info("Triggerbar address = 0x%x.", triggerbar);
 583         sr_info("Ramsize trigger    = 0x%x.", ramsize_trigger);
 584         sr_info("Memory size        = 0x%x.", memory_size);
 585
 586         /* Send header packet to the session bus. */
 587         std_session_send_df_header(cb_data, LOG_PREFIX);
 588
 589         /* Check for empty capture */
 590         if ((status & STATUS_READY) && !stop_address) {
 591                 packet.type = SR_DF_END;
 592                 sr_session_send(cb_data, &packet);
 593                 return SR_OK;
 594         }
 595
 596         buf = g_malloc(PACKET_SIZE);
 597
 598         /* Check if the trigger is in the samples we are throwing away */
 599         trigger_now = now_address == trigger_address ||
 600                 ((now_address + 1) % memory_size) == trigger_address;
 601
 602         /*
 603          * STATUS_READY doesn't clear until now_address advances past
 604          * addr 0, but for our logic, clear it in that case
 605          */
 606         if (!now_address)
 607                 status &= ~STATUS_READY;
 608
 609         analyzer_read_start(usb->devhdl);
 610
 611         /* Calculate how much data to discard */
 612         discard = 0;
 613         if (status & STATUS_READY) {
 614                 /*
 615                  * We haven't wrapped around, we need to throw away data from
 616                  * our current position to the end of the buffer.
 617                  * Additionally, the first two samples captured are always
 618                  * bogus.
 619                  */
 620                 discard += memory_size - now_address + 2;
 621                 now_address = 2;
 622         }
 623
 624         /* If we have more samples than we need, discard them */
 625         valid_samples = (stop_address - now_address) % memory_size;
 626         if (valid_samples > ramsize_trigger + triggerbar) {
 627                 discard += valid_samples - (ramsize_trigger + triggerbar);
 628                 now_address += valid_samples - (ramsize_trigger + triggerbar);
 629         }
 630
 631         sr_info("Need to discard %d samples.", discard);
 632
 633         /* Calculate how far in the trigger is */
 634         if (trigger_now)
 635                 trigger_offset = 0;
 636         else
 637                 trigger_offset = (trigger_address - now_address) % memory_size;
 638
 639         /* Recalculate the number of samples available */
 640         valid_samples = (stop_address - now_address) % memory_size;
 641
 642         /* Send the incoming transfer to the session bus. */
 643         samples_read = 0;
 644         for (packet_num = 0; packet_num < n / PACKET_SIZE; packet_num++) {
 645                 unsigned int len;
 646                 unsigned int buf_offset;
 647
 648                 res = analyzer_read_data(usb->devhdl, buf, PACKET_SIZE);
 649                 sr_info("Tried to read %d bytes, actually read %d bytes.",
 650                         PACKET_SIZE, res);
 651
 652                 if (discard >= PACKET_SIZE / 4) {
 653                         discard -= PACKET_SIZE / 4;
 654                         continue;
 655                 }
 656
 657                 len = PACKET_SIZE - discard * 4;
 658                 buf_offset = discard * 4;
 659                 discard = 0;
 660
 661                 /* Check if we've read all the samples */
 662                 if (samples_read + len / 4 >= valid_samples)
 663                         len = (valid_samples - samples_read) * 4;
 664                 if (!len)
 665                         break;
 666
 667                 if (samples_read < trigger_offset &&
 668                     samples_read + len / 4 > trigger_offset) {
 669                         /* Send out samples remaining before trigger */
 670                         packet.type = SR_DF_LOGIC;
 671                         packet.payload = &logic;
 672                         logic.length = (trigger_offset - samples_read) * 4;
 673                         logic.unitsize = 4;
 674                         logic.data = buf + buf_offset;
 675                         sr_session_send(cb_data, &packet);
 676                         len -= logic.length;
 677                         samples_read += logic.length / 4;
 678                         buf_offset += logic.length;
 679                 }
 680
 681                 if (samples_read == trigger_offset) {
 682                         /* Send out trigger */
 683                         packet.type = SR_DF_TRIGGER;
 684                         packet.payload = NULL;
 685                         sr_session_send(cb_data, &packet);
 686                 }
 687
 688                 /* Send out data (or data after trigger) */
 689                 packet.type = SR_DF_LOGIC;
 690                 packet.payload = &logic;
 691                 logic.length = len;
 692                 logic.unitsize = 4;
 693                 logic.data = buf + buf_offset;
 694                 sr_session_send(cb_data, &packet);
 695                 samples_read += len / 4;
 696         }
 697         analyzer_read_stop(usb->devhdl);
 698         g_free(buf);
 699
 700         packet.type = SR_DF_END;
 701         sr_session_send(cb_data, &packet);
 702
 703         return SR_OK;
 704 }
 705
 706 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 707 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 708 {
 709         struct dev_context *devc;
 710         struct sr_usb_dev_inst *usb;
 711         struct sr_datafeed_packet packet;
 712
 713         packet.type = SR_DF_END;
 714         sr_session_send(cb_data, &packet);
 715
 716         if (!(devc = sdi->priv)) {
 717                 sr_err("%s: sdi->priv was NULL", __func__);
 718                 return SR_ERR_BUG;
 719         }
 720
 721         usb = sdi->conn;
 722         analyzer_reset(usb->devhdl);
 723         /* TODO: Need to cancel and free any queued up transfers. */
 724
 725         return SR_OK;
 726 }
 727
 728 SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info = {
 729         .name = "zeroplus-logic-cube",
 730         .longname = "ZEROPLUS Logic Cube LAP-C series",
 731         .api_version = 1,
 732         .init = init,
 733         .cleanup = cleanup,
 734         .scan = scan,
 735         .dev_list = dev_list,
 736         .dev_clear = NULL,
 737         .config_get = config_get,
 738         .config_set = config_set,
 739         .config_list = config_list,
 740         .dev_open = dev_open,
 741         .dev_close = dev_close,
 742         .dev_acquisition_start = dev_acquisition_start,
 743         .dev_acquisition_stop = dev_acquisition_stop,
 744         .context = NULL,
 745 };