src/hardware/hantek-6xxx/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2015 Christer Ekholm <christerekholm@gmail.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 <math.h>
  22 #include "protocol.h"
  23
  24 /* Max time in ms before we want to check on USB events */
  25 #define TICK 200
  26
  27 #define RANGE(ch) (((float)vdivs[devc->voltage[ch]][0] / vdivs[devc->voltage[ch]][1]) * VDIV_MULTIPLIER)
  28
  29 static const uint32_t scanopts[] = {
  30         SR_CONF_CONN,
  31 };
  32
  33 static const uint32_t drvopts[] = {
  34         SR_CONF_OSCILLOSCOPE,
  35 };
  36
  37 static const uint32_t devopts[] = {
  38         SR_CONF_CONN | SR_CONF_GET,
  39         SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
  40         SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET,
  41         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  42         SR_CONF_NUM_VDIV | SR_CONF_GET,
  43 };
  44
  45 static const uint32_t devopts_cg[] = {
  46         SR_CONF_VDIV | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  47         SR_CONF_COUPLING | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  48 };
  49
  50 static const char *channel_names[] = {
  51         "CH1", "CH2",
  52 };
  53
  54 static const char *dc_coupling[] = {
  55         "DC",
  56 };
  57
  58 static const char *acdc_coupling[] = {
  59         "AC", "DC",
  60 };
  61
  62 static const struct hantek_6xxx_profile dev_profiles[] = {
  63         {
  64                 0x04b4, 0x6022, 0x1d50, 0x608e, 0x0001,
  65                 "Hantek", "6022BE", "fx2lafw-hantek-6022be.fw",
  66                 ARRAY_AND_SIZE(dc_coupling), FALSE,
  67         },
  68         {
  69                 0x8102, 0x8102, 0x1d50, 0x608e, 0x0002,
  70                 "Sainsmart", "DDS120", "fx2lafw-sainsmart-dds120.fw",
  71                 ARRAY_AND_SIZE(acdc_coupling), TRUE,
  72         },
  73         {
  74                 0x04b4, 0x602a, 0x1d50, 0x608e, 0x0003,
  75                 "Hantek", "6022BL", "fx2lafw-hantek-6022bl.fw",
  76                 ARRAY_AND_SIZE(dc_coupling), FALSE,
  77         },
  78         ALL_ZERO
  79 };
  80
  81 static const uint64_t samplerates[] = {
  82         SAMPLERATE_VALUES
  83 };
  84
  85 static const uint64_t vdivs[][2] = {
  86         VDIV_VALUES
  87 };
  88
  89 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount);
  90
  91 static struct sr_dev_inst *hantek_6xxx_dev_new(const struct hantek_6xxx_profile *prof)
  92 {
  93         struct sr_dev_inst *sdi;
  94         struct sr_channel *ch;
  95         struct sr_channel_group *cg;
  96         struct dev_context *devc;
  97         unsigned int i;
  98
  99         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 100         sdi->status = SR_ST_INITIALIZING;
 101         sdi->vendor = g_strdup(prof->vendor);
 102         sdi->model = g_strdup(prof->model);
 103
 104         for (i = 0; i < ARRAY_SIZE(channel_names); i++) {
 105                 ch = sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE, channel_names[i]);
 106                 cg = g_malloc0(sizeof(struct sr_channel_group));
 107                 cg->name = g_strdup(channel_names[i]);
 108                 cg->channels = g_slist_append(cg->channels, ch);
 109                 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 110         }
 111
 112         devc = g_malloc0(sizeof(struct dev_context));
 113
 114         for (i = 0; i < NUM_CHANNELS; i++) {
 115                 devc->ch_enabled[i] = TRUE;
 116                 devc->voltage[i] = DEFAULT_VOLTAGE;
 117                 devc->coupling[i] = DEFAULT_COUPLING;
 118         }
 119         devc->coupling_vals = prof->coupling_vals;
 120         devc->coupling_tab_size = prof->coupling_tab_size;
 121         devc->has_coupling = prof->has_coupling;
 122
 123         devc->profile = prof;
 124         devc->dev_state = IDLE;
 125         devc->samplerate = DEFAULT_SAMPLERATE;
 126
 127         sdi->priv = devc;
 128
 129         return sdi;
 130 }
 131
 132 static int configure_channels(const struct sr_dev_inst *sdi)
 133 {
 134         struct dev_context *devc;
 135         const GSList *l;
 136         int p;
 137         struct sr_channel *ch;
 138         devc = sdi->priv;
 139
 140         g_slist_free(devc->enabled_channels);
 141         devc->enabled_channels = NULL;
 142         memset(devc->ch_enabled, 0, sizeof(devc->ch_enabled));
 143
 144         for (l = sdi->channels, p = 0; l; l = l->next, p++) {
 145                 ch = l->data;
 146                 if (p < NUM_CHANNELS) {
 147                         devc->ch_enabled[p] = ch->enabled;
 148                         devc->enabled_channels = g_slist_append(devc->enabled_channels, ch);
 149                 }
 150         }
 151
 152         return SR_OK;
 153 }
 154
 155 static void clear_helper(struct dev_context *devc)
 156 {
 157         g_slist_free(devc->enabled_channels);
 158 }
 159
 160 static int dev_clear(const struct sr_dev_driver *di)
 161 {
 162         return std_dev_clear_with_callback(di, (std_dev_clear_callback)clear_helper);
 163 }
 164
 165 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 166 {
 167         struct drv_context *drvc;
 168         struct dev_context *devc;
 169         struct sr_dev_inst *sdi;
 170         struct sr_usb_dev_inst *usb;
 171         struct sr_config *src;
 172         const struct hantek_6xxx_profile *prof;
 173         GSList *l, *devices, *conn_devices;
 174         struct libusb_device_descriptor des;
 175         libusb_device **devlist;
 176         int i, j;
 177         const char *conn;
 178         char connection_id[64];
 179
 180         drvc = di->context;
 181
 182         devices = 0;
 183
 184         conn = NULL;
 185         for (l = options; l; l = l->next) {
 186                 src = l->data;
 187                 if (src->key == SR_CONF_CONN) {
 188                         conn = g_variant_get_string(src->data, NULL);
 189                         break;
 190                 }
 191         }
 192         if (conn)
 193                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 194         else
 195                 conn_devices = NULL;
 196
 197         /* Find all Hantek 60xx devices and upload firmware to all of them. */
 198         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 199         for (i = 0; devlist[i]; i++) {
 200                 if (conn) {
 201                         usb = NULL;
 202                         for (l = conn_devices; l; l = l->next) {
 203                                 usb = l->data;
 204                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 205                                         && usb->address == libusb_get_device_address(devlist[i]))
 206                                         break;
 207                         }
 208                         if (!l)
 209                                 /* This device matched none of the ones that
 210                                  * matched the conn specification. */
 211                                 continue;
 212                 }
 213
 214                 libusb_get_device_descriptor(devlist[i], &des);
 215
 216                 if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
 217                         continue;
 218
 219                 prof = NULL;
 220                 for (j = 0; dev_profiles[j].orig_vid; j++) {
 221                         if (des.idVendor == dev_profiles[j].orig_vid
 222                                 && des.idProduct == dev_profiles[j].orig_pid) {
 223                                 /* Device matches the pre-firmware profile. */
 224                                 prof = &dev_profiles[j];
 225                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 226                                 sdi = hantek_6xxx_dev_new(prof);
 227                                 sdi->connection_id = g_strdup(connection_id);
 228                                 devices = g_slist_append(devices, sdi);
 229                                 devc = sdi->priv;
 230                                 if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 231                                                 USB_CONFIGURATION, prof->firmware) == SR_OK) {
 232                                         /* Remember when the firmware on this device was updated. */
 233                                         devc->fw_updated = g_get_monotonic_time();
 234                                 } else {
 235                                         sr_err("Firmware upload failed, name %s.", prof->firmware);
 236                                 }
 237                                 /* Dummy USB address of 0xff will get overwritten later. */
 238                                 sdi->conn = sr_usb_dev_inst_new(
 239                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 240                                 break;
 241                         } else if (des.idVendor == dev_profiles[j].fw_vid
 242                                 && des.idProduct == dev_profiles[j].fw_pid
 243                                 && des.bcdDevice == dev_profiles[j].fw_prod_ver) {
 244                                 /* Device matches the post-firmware profile. */
 245                                 prof = &dev_profiles[j];
 246                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 247                                 sdi = hantek_6xxx_dev_new(prof);
 248                                 sdi->connection_id = g_strdup(connection_id);
 249                                 sdi->status = SR_ST_INACTIVE;
 250                                 devices = g_slist_append(devices, sdi);
 251                                 sdi->inst_type = SR_INST_USB;
 252                                 sdi->conn = sr_usb_dev_inst_new(
 253                                                 libusb_get_bus_number(devlist[i]),
 254                                                 libusb_get_device_address(devlist[i]), NULL);
 255                                 break;
 256                         }
 257                 }
 258                 if (!prof)
 259                         /* Not a supported VID/PID. */
 260                         continue;
 261         }
 262         libusb_free_device_list(devlist, 1);
 263
 264         return std_scan_complete(di, devices);
 265 }
 266
 267 static int dev_open(struct sr_dev_inst *sdi)
 268 {
 269         struct dev_context *devc;
 270         struct sr_usb_dev_inst *usb;
 271         int64_t timediff_us, timediff_ms;
 272         int err;
 273
 274         devc = sdi->priv;
 275         usb = sdi->conn;
 276
 277         /*
 278          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 279          * for the FX2 to renumerate.
 280          */
 281         err = SR_ERR;
 282         if (devc->fw_updated > 0) {
 283                 sr_info("Waiting for device to reset.");
 284                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 285                 g_usleep(300 * 1000);
 286                 timediff_ms = 0;
 287                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 288                         if ((err = hantek_6xxx_open(sdi)) == SR_OK)
 289                                 break;
 290                         g_usleep(100 * 1000);
 291                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 292                         timediff_ms = timediff_us / 1000;
 293                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 294                 }
 295                 if (timediff_ms < MAX_RENUM_DELAY_MS)
 296                         sr_info("Device came back after %"PRIu64" ms.", timediff_ms);
 297         } else {
 298                 err = hantek_6xxx_open(sdi);
 299         }
 300
 301         if (err != SR_OK) {
 302                 sr_err("Unable to open device.");
 303                 return SR_ERR;
 304         }
 305
 306         err = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 307         if (err != 0) {
 308                 sr_err("Unable to claim interface: %s.",
 309                         libusb_error_name(err));
 310                 return SR_ERR;
 311         }
 312
 313         return SR_OK;
 314 }
 315
 316 static int dev_close(struct sr_dev_inst *sdi)
 317 {
 318         hantek_6xxx_close(sdi);
 319
 320         return SR_OK;
 321 }
 322
 323 static int config_get(uint32_t key, GVariant **data,
 324         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 325 {
 326         struct dev_context *devc;
 327         struct sr_usb_dev_inst *usb;
 328         const uint64_t *vdiv;
 329         int ch_idx;
 330
 331         switch (key) {
 332         case SR_CONF_NUM_VDIV:
 333                 *data = g_variant_new_int32(ARRAY_SIZE(vdivs));
 334                 break;
 335         }
 336
 337         if (!sdi)
 338                 return SR_ERR_ARG;
 339
 340         devc = sdi->priv;
 341         if (!cg) {
 342                 switch (key) {
 343                 case SR_CONF_SAMPLERATE:
 344                         *data = g_variant_new_uint64(devc->samplerate);
 345                         break;
 346                 case SR_CONF_LIMIT_MSEC:
 347                         *data = g_variant_new_uint64(devc->limit_msec);
 348                         break;
 349                 case SR_CONF_LIMIT_SAMPLES:
 350                         *data = g_variant_new_uint64(devc->limit_samples);
 351                         break;
 352                 case SR_CONF_CONN:
 353                         if (!sdi->conn)
 354                                 return SR_ERR_ARG;
 355                         usb = sdi->conn;
 356                         if (usb->address == 255)
 357                                 /* Device still needs to re-enumerate after firmware
 358                                  * upload, so we don't know its (future) address. */
 359                                 return SR_ERR;
 360                         *data = g_variant_new_printf("%d.%d", usb->bus, usb->address);
 361                         break;
 362                 default:
 363                         return SR_ERR_NA;
 364                 }
 365         } else {
 366                 if (sdi->channel_groups->data == cg)
 367                         ch_idx = 0;
 368                 else if (sdi->channel_groups->next->data == cg)
 369                         ch_idx = 1;
 370                 else
 371                         return SR_ERR_ARG;
 372                 switch (key) {
 373                 case SR_CONF_VDIV:
 374                         vdiv = vdivs[devc->voltage[ch_idx]];
 375                         *data = g_variant_new("(tt)", vdiv[0], vdiv[1]);
 376                         break;
 377                 case SR_CONF_COUPLING:
 378                         *data = g_variant_new_string((devc->coupling[ch_idx] \
 379                                         == COUPLING_DC) ? "DC" : "AC");
 380                         break;
 381                 }
 382         }
 383
 384         return SR_OK;
 385 }
 386
 387 static int config_set(uint32_t key, GVariant *data,
 388         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 389 {
 390         struct dev_context *devc;
 391         int ch_idx, idx;
 392
 393         devc = sdi->priv;
 394         if (!cg) {
 395                 switch (key) {
 396                 case SR_CONF_SAMPLERATE:
 397                         devc->samplerate = g_variant_get_uint64(data);
 398                         hantek_6xxx_update_samplerate(sdi);
 399                         break;
 400                 case SR_CONF_LIMIT_MSEC:
 401                         devc->limit_msec = g_variant_get_uint64(data);
 402                         break;
 403                 case SR_CONF_LIMIT_SAMPLES:
 404                         devc->limit_samples = g_variant_get_uint64(data);
 405                         break;
 406                 default:
 407                         return SR_ERR_NA;
 408                 }
 409         } else {
 410                 if (sdi->channel_groups->data == cg)
 411                         ch_idx = 0;
 412                 else if (sdi->channel_groups->next->data == cg)
 413                         ch_idx = 1;
 414                 else
 415                         return SR_ERR_ARG;
 416                 switch (key) {
 417                 case SR_CONF_VDIV:
 418                         if ((idx = std_u64_tuple_idx(data, ARRAY_AND_SIZE(vdivs))) < 0)
 419                                 return SR_ERR_ARG;
 420                         devc->voltage[ch_idx] = idx;
 421                         hantek_6xxx_update_vdiv(sdi);
 422                         break;
 423                 case SR_CONF_COUPLING:
 424                         if ((idx = std_str_idx(data, devc->coupling_vals,
 425                                                 devc->coupling_tab_size)) < 0)
 426                                 return SR_ERR_ARG;
 427                         devc->coupling[ch_idx] = idx;
 428                         break;
 429                 default:
 430                         return SR_ERR_NA;
 431                 }
 432         }
 433
 434         return SR_OK;
 435 }
 436
 437 static int config_list(uint32_t key, GVariant **data,
 438         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 439 {
 440         struct dev_context *devc;
 441
 442         devc = (sdi) ? sdi->priv : NULL;
 443
 444         if (!cg) {
 445                 switch (key) {
 446                 case SR_CONF_SCAN_OPTIONS:
 447                 case SR_CONF_DEVICE_OPTIONS:
 448                         return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
 449                 case SR_CONF_SAMPLERATE:
 450                         *data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates));
 451                         break;
 452                 default:
 453                         return SR_ERR_NA;
 454                 }
 455         } else {
 456                 switch (key) {
 457                 case SR_CONF_DEVICE_OPTIONS:
 458                         *data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg));
 459                         break;
 460                 case SR_CONF_COUPLING:
 461                         if (!devc)
 462                                 return SR_ERR_ARG;
 463                         *data = g_variant_new_strv(devc->coupling_vals, devc->coupling_tab_size);
 464                         break;
 465                 case SR_CONF_VDIV:
 466                         *data = std_gvar_tuple_array(ARRAY_AND_SIZE(vdivs));
 467                         break;
 468                 default:
 469                         return SR_ERR_NA;
 470                 }
 471         }
 472
 473         return SR_OK;
 474 }
 475
 476 /* Minimise data amount for limit_samples and limit_msec limits. */
 477 static uint32_t data_amount(const struct sr_dev_inst *sdi)
 478 {
 479         struct dev_context *devc = sdi->priv;
 480         uint32_t data_left, data_left_2, i;
 481         int32_t time_left;
 482
 483         if (devc->limit_msec) {
 484                 time_left = devc->limit_msec - (g_get_monotonic_time() - devc->aq_started) / 1000;
 485                 data_left = devc->samplerate * MAX(time_left, 0) * NUM_CHANNELS / 1000;
 486         } else if (devc->limit_samples) {
 487                 data_left = (devc->limit_samples - devc->samp_received) * NUM_CHANNELS;
 488         } else {
 489                 data_left = devc->samplerate * NUM_CHANNELS;
 490         }
 491
 492         /* Round up to nearest power of two. */
 493         for (i = MIN_PACKET_SIZE; i < data_left; i *= 2)
 494                 ;
 495         data_left_2 = i;
 496
 497         sr_spew("data_amount: %u (rounded to power of 2: %u)", data_left, data_left_2);
 498
 499         return data_left_2;
 500 }
 501
 502 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 503                 int num_samples)
 504 {
 505         struct sr_datafeed_packet packet;
 506         struct sr_datafeed_analog analog;
 507         struct sr_analog_encoding encoding;
 508         struct sr_analog_meaning meaning;
 509         struct sr_analog_spec spec;
 510         struct dev_context *devc = sdi->priv;
 511         GSList *channels = devc->enabled_channels;
 512
 513         const float ch_bit[] = { RANGE(0) / 255, RANGE(1) / 255 };
 514         const float ch_center[] = { RANGE(0) / 2, RANGE(1) / 2 };
 515
 516         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
 517
 518         packet.type = SR_DF_ANALOG;
 519         packet.payload = &analog;
 520
 521         analog.num_samples = num_samples;
 522         analog.meaning->mq = SR_MQ_VOLTAGE;
 523         analog.meaning->unit = SR_UNIT_VOLT;
 524         analog.meaning->mqflags = 0;
 525
 526         analog.data = g_try_malloc(num_samples * sizeof(float));
 527         if (!analog.data) {
 528                 sr_err("Analog data buffer malloc failed.");
 529                 devc->dev_state = STOPPING;
 530                 return;
 531         }
 532
 533         for (int ch = 0; ch < NUM_CHANNELS; ch++) {
 534                 if (!devc->ch_enabled[ch])
 535                         continue;
 536
 537                 float vdivlog = log10f(ch_bit[ch]);
 538                 int digits = -(int)vdivlog + (vdivlog < 0.0);
 539                 analog.encoding->digits = digits;
 540                 analog.spec->spec_digits = digits;
 541                 analog.meaning->channels = g_slist_append(NULL, channels->data);
 542
 543                 for (int i = 0; i < num_samples; i++) {
 544                         /*
 545                          * The device always sends data for both channels. If a channel
 546                          * is disabled, it contains a copy of the enabled channel's
 547                          * data. However, we only send the requested channels to
 548                          * the bus.
 549                          *
 550                          * Voltage values are encoded as a value 0-255, where the
 551                          * value is a point in the range represented by the vdiv
 552                          * setting. There are 10 vertical divs, so e.g. 500mV/div
 553                          * represents 5V peak-to-peak where 0 = -2.5V and 255 = +2.5V.
 554                          */
 555                         ((float *)analog.data)[i] = ch_bit[ch] * *(buf + i * 2 + ch) - ch_center[ch];
 556                 }
 557
 558                 sr_session_send(sdi, &packet);
 559                 g_slist_free(analog.meaning->channels);
 560
 561                 channels = channels->next;
 562         }
 563         g_free(analog.data);
 564 }
 565
 566 /*
 567  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 568  * Only channel data comes in asynchronously, and all transfers for this are
 569  * queued up beforehand, so this just needs to chuck the incoming data onto
 570  * the libsigrok session bus.
 571  */
 572 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 573 {
 574         struct sr_dev_inst *sdi;
 575         struct dev_context *devc;
 576
 577         sdi = transfer->user_data;
 578         devc = sdi->priv;
 579
 580         if (devc->dev_state == FLUSH) {
 581                 g_free(transfer->buffer);
 582                 libusb_free_transfer(transfer);
 583                 devc->dev_state = CAPTURE;
 584                 devc->aq_started = g_get_monotonic_time();
 585                 read_channel(sdi, data_amount(sdi));
 586                 return;
 587         }
 588
 589         if (devc->dev_state != CAPTURE)
 590                 return;
 591
 592         sr_spew("receive_transfer(): calculated samplerate == %" PRIu64 "ks/s",
 593                 (uint64_t)(transfer->actual_length * 1000 /
 594                 (g_get_monotonic_time() - devc->read_start_ts + 1) /
 595                 NUM_CHANNELS));
 596
 597         sr_spew("receive_transfer(): status %s received %d bytes.",
 598                 libusb_error_name(transfer->status), transfer->actual_length);
 599
 600         if (transfer->actual_length == 0)
 601                 /* Nothing to send to the bus. */
 602                 return;
 603
 604         unsigned samples_received = transfer->actual_length / NUM_CHANNELS;
 605         send_chunk(sdi, transfer->buffer, samples_received);
 606         devc->samp_received += samples_received;
 607
 608         g_free(transfer->buffer);
 609         libusb_free_transfer(transfer);
 610
 611         if (devc->limit_samples && devc->samp_received >= devc->limit_samples) {
 612                 sr_info("Requested number of samples reached, stopping. %"
 613                         PRIu64 " <= %" PRIu64, devc->limit_samples,
 614                         devc->samp_received);
 615                 sr_dev_acquisition_stop(sdi);
 616         } else if (devc->limit_msec && (g_get_monotonic_time() -
 617                         devc->aq_started) / 1000 >= devc->limit_msec) {
 618                 sr_info("Requested time limit reached, stopping. %d <= %d",
 619                         (uint32_t)devc->limit_msec,
 620                         (uint32_t)(g_get_monotonic_time() - devc->aq_started) / 1000);
 621                 sr_dev_acquisition_stop(sdi);
 622         } else {
 623                 read_channel(sdi, data_amount(sdi));
 624         }
 625 }
 626
 627 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount)
 628 {
 629         int ret;
 630         struct dev_context *devc;
 631
 632         devc = sdi->priv;
 633
 634         amount = MIN(amount, MAX_PACKET_SIZE);
 635         ret = hantek_6xxx_get_channeldata(sdi, receive_transfer, amount);
 636         devc->read_start_ts = g_get_monotonic_time();
 637
 638         return ret;
 639 }
 640
 641 static int handle_event(int fd, int revents, void *cb_data)
 642 {
 643         const struct sr_dev_inst *sdi;
 644         struct timeval tv;
 645         struct sr_dev_driver *di;
 646         struct dev_context *devc;
 647         struct drv_context *drvc;
 648
 649         (void)fd;
 650         (void)revents;
 651
 652         sdi = cb_data;
 653         di = sdi->driver;
 654         drvc = di->context;
 655         devc = sdi->priv;
 656
 657         /* Always handle pending libusb events. */
 658         tv.tv_sec = tv.tv_usec = 0;
 659         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 660
 661         if (devc->dev_state == STOPPING) {
 662                 /* We've been told to wind up the acquisition. */
 663                 sr_dbg("Stopping acquisition.");
 664
 665                 hantek_6xxx_stop_data_collecting(sdi);
 666                 /*
 667                  * TODO: Doesn't really cancel pending transfers so they might
 668                  * come in after SR_DF_END is sent.
 669                  */
 670                 usb_source_remove(sdi->session, drvc->sr_ctx);
 671
 672                 std_session_send_df_end(sdi);
 673
 674                 devc->dev_state = IDLE;
 675
 676                 return TRUE;
 677         }
 678
 679         return TRUE;
 680 }
 681
 682 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 683 {
 684         struct dev_context *devc;
 685         struct sr_dev_driver *di = sdi->driver;
 686         struct drv_context *drvc = di->context;
 687
 688         devc = sdi->priv;
 689
 690         if (configure_channels(sdi) != SR_OK) {
 691                 sr_err("Failed to configure channels.");
 692                 return SR_ERR;
 693         }
 694
 695         if (hantek_6xxx_init(sdi) != SR_OK)
 696                 return SR_ERR;
 697
 698         std_session_send_df_header(sdi);
 699
 700         devc->samp_received = 0;
 701         devc->dev_state = FLUSH;
 702
 703         usb_source_add(sdi->session, drvc->sr_ctx, TICK,
 704                        handle_event, (void *)sdi);
 705
 706         hantek_6xxx_start_data_collecting(sdi);
 707
 708         read_channel(sdi, FLUSH_PACKET_SIZE);
 709
 710         return SR_OK;
 711 }
 712
 713 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 714 {
 715         struct dev_context *devc;
 716
 717         devc = sdi->priv;
 718         devc->dev_state = STOPPING;
 719
 720         return SR_OK;
 721 }
 722
 723 static struct sr_dev_driver hantek_6xxx_driver_info = {
 724         .name = "hantek-6xxx",
 725         .longname = "Hantek 6xxx",
 726         .api_version = 1,
 727         .init = std_init,
 728         .cleanup = std_cleanup,
 729         .scan = scan,
 730         .dev_list = std_dev_list,
 731         .dev_clear = dev_clear,
 732         .config_get = config_get,
 733         .config_set = config_set,
 734         .config_list = config_list,
 735         .dev_open = dev_open,
 736         .dev_close = dev_close,
 737         .dev_acquisition_start = dev_acquisition_start,
 738         .dev_acquisition_stop = dev_acquisition_stop,
 739         .context = NULL,
 740 };
 741 SR_REGISTER_DEV_DRIVER(hantek_6xxx_driver_info);