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                 /* Windows: "Hantek6022BE DRIVER 1": 04b4:6022 */
  65                 0x04b4, 0x6022, 0x1d50, 0x608e, 0x0001,
  66                 "Hantek", "6022BE", "fx2lafw-hantek-6022be.fw",
  67                 ARRAY_AND_SIZE(dc_coupling), FALSE,
  68         },
  69         {
  70                 /* Windows: "Hantek6022BE DRIVER 2": 04b5:6022 */
  71                 0x04b5, 0x6022, 0x1d50, 0x608e, 0x0001,
  72                 "Hantek", "6022BE", "fx2lafw-hantek-6022be.fw",
  73                 ARRAY_AND_SIZE(dc_coupling), FALSE,
  74         },
  75         {
  76                 0x8102, 0x8102, 0x1d50, 0x608e, 0x0002,
  77                 "Sainsmart", "DDS120", "fx2lafw-sainsmart-dds120.fw",
  78                 ARRAY_AND_SIZE(acdc_coupling), TRUE,
  79         },
  80         {
  81                 /* Windows: "Hantek6022BL DRIVER 1": 04b4:602a */
  82                 0x04b4, 0x602a, 0x1d50, 0x608e, 0x0003,
  83                 "Hantek", "6022BL", "fx2lafw-hantek-6022bl.fw",
  84                 ARRAY_AND_SIZE(dc_coupling), FALSE,
  85         },
  86         {
  87                 /* Windows: "Hantek6022BL DRIVER 2": 04b5:602a */
  88                 0x04b5, 0x602a, 0x1d50, 0x608e, 0x0003,
  89                 "Hantek", "6022BL", "fx2lafw-hantek-6022bl.fw",
  90                 ARRAY_AND_SIZE(dc_coupling), FALSE,
  91         },
  92         {
  93                 0xd4a2, 0x5660, 0x1d50, 0x608e, 0x0004,
  94                 "YiXingDianZi", "MDSO", "fx2lafw-yixingdianzi-mdso.fw",
  95                 ARRAY_AND_SIZE(dc_coupling), FALSE,
  96         },
  97         ALL_ZERO
  98 };
  99
 100 static const uint64_t samplerates[] = {
 101         SAMPLERATE_VALUES
 102 };
 103
 104 static const uint64_t vdivs[][2] = {
 105         VDIV_VALUES
 106 };
 107
 108 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount);
 109
 110 static struct sr_dev_inst *hantek_6xxx_dev_new(const struct hantek_6xxx_profile *prof)
 111 {
 112         struct sr_dev_inst *sdi;
 113         struct sr_channel *ch;
 114         struct sr_channel_group *cg;
 115         struct dev_context *devc;
 116         unsigned int i;
 117
 118         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 119         sdi->status = SR_ST_INITIALIZING;
 120         sdi->vendor = g_strdup(prof->vendor);
 121         sdi->model = g_strdup(prof->model);
 122
 123         for (i = 0; i < ARRAY_SIZE(channel_names); i++) {
 124                 ch = sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE, channel_names[i]);
 125                 cg = g_malloc0(sizeof(struct sr_channel_group));
 126                 cg->name = g_strdup(channel_names[i]);
 127                 cg->channels = g_slist_append(cg->channels, ch);
 128                 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 129         }
 130
 131         devc = g_malloc0(sizeof(struct dev_context));
 132
 133         for (i = 0; i < NUM_CHANNELS; i++) {
 134                 devc->ch_enabled[i] = TRUE;
 135                 devc->voltage[i] = DEFAULT_VOLTAGE;
 136                 devc->coupling[i] = DEFAULT_COUPLING;
 137         }
 138         devc->coupling_vals = prof->coupling_vals;
 139         devc->coupling_tab_size = prof->coupling_tab_size;
 140         devc->has_coupling = prof->has_coupling;
 141
 142         devc->profile = prof;
 143         devc->dev_state = IDLE;
 144         devc->samplerate = DEFAULT_SAMPLERATE;
 145
 146         sdi->priv = devc;
 147
 148         return sdi;
 149 }
 150
 151 static int configure_channels(const struct sr_dev_inst *sdi)
 152 {
 153         struct dev_context *devc;
 154         const GSList *l;
 155         int p;
 156         struct sr_channel *ch;
 157         devc = sdi->priv;
 158
 159         g_slist_free(devc->enabled_channels);
 160         devc->enabled_channels = NULL;
 161         memset(devc->ch_enabled, 0, sizeof(devc->ch_enabled));
 162
 163         for (l = sdi->channels, p = 0; l; l = l->next, p++) {
 164                 ch = l->data;
 165                 if (p < NUM_CHANNELS) {
 166                         devc->ch_enabled[p] = ch->enabled;
 167                         devc->enabled_channels = g_slist_append(devc->enabled_channels, ch);
 168                 }
 169         }
 170
 171         return SR_OK;
 172 }
 173
 174 static void clear_helper(struct dev_context *devc)
 175 {
 176         g_slist_free(devc->enabled_channels);
 177 }
 178
 179 static int dev_clear(const struct sr_dev_driver *di)
 180 {
 181         return std_dev_clear_with_callback(di, (std_dev_clear_callback)clear_helper);
 182 }
 183
 184 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 185 {
 186         struct drv_context *drvc;
 187         struct dev_context *devc;
 188         struct sr_dev_inst *sdi;
 189         struct sr_usb_dev_inst *usb;
 190         struct sr_config *src;
 191         const struct hantek_6xxx_profile *prof;
 192         GSList *l, *devices, *conn_devices;
 193         struct libusb_device_descriptor des;
 194         libusb_device **devlist;
 195         int i, j;
 196         const char *conn;
 197         char connection_id[64];
 198
 199         drvc = di->context;
 200
 201         devices = 0;
 202
 203         conn = NULL;
 204         for (l = options; l; l = l->next) {
 205                 src = l->data;
 206                 if (src->key == SR_CONF_CONN) {
 207                         conn = g_variant_get_string(src->data, NULL);
 208                         break;
 209                 }
 210         }
 211         if (conn)
 212                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 213         else
 214                 conn_devices = NULL;
 215
 216         /* Find all Hantek 60xx devices and upload firmware to all of them. */
 217         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 218         for (i = 0; devlist[i]; i++) {
 219                 if (conn) {
 220                         usb = NULL;
 221                         for (l = conn_devices; l; l = l->next) {
 222                                 usb = l->data;
 223                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 224                                         && usb->address == libusb_get_device_address(devlist[i]))
 225                                         break;
 226                         }
 227                         if (!l)
 228                                 /* This device matched none of the ones that
 229                                  * matched the conn specification. */
 230                                 continue;
 231                 }
 232
 233                 libusb_get_device_descriptor(devlist[i], &des);
 234
 235                 if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
 236                         continue;
 237
 238                 prof = NULL;
 239                 for (j = 0; dev_profiles[j].orig_vid; j++) {
 240                         if (des.idVendor == dev_profiles[j].orig_vid
 241                                 && des.idProduct == dev_profiles[j].orig_pid) {
 242                                 /* Device matches the pre-firmware profile. */
 243                                 prof = &dev_profiles[j];
 244                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 245                                 sdi = hantek_6xxx_dev_new(prof);
 246                                 sdi->connection_id = g_strdup(connection_id);
 247                                 devices = g_slist_append(devices, sdi);
 248                                 devc = sdi->priv;
 249                                 if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 250                                                 USB_CONFIGURATION, prof->firmware) == SR_OK) {
 251                                         /* Remember when the firmware on this device was updated. */
 252                                         devc->fw_updated = g_get_monotonic_time();
 253                                 } else {
 254                                         sr_err("Firmware upload failed, name %s.", prof->firmware);
 255                                 }
 256                                 /* Dummy USB address of 0xff will get overwritten later. */
 257                                 sdi->conn = sr_usb_dev_inst_new(
 258                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 259                                 break;
 260                         } else if (des.idVendor == dev_profiles[j].fw_vid
 261                                 && des.idProduct == dev_profiles[j].fw_pid
 262                                 && des.bcdDevice == dev_profiles[j].fw_prod_ver) {
 263                                 /* Device matches the post-firmware profile. */
 264                                 prof = &dev_profiles[j];
 265                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 266                                 sdi = hantek_6xxx_dev_new(prof);
 267                                 sdi->connection_id = g_strdup(connection_id);
 268                                 sdi->status = SR_ST_INACTIVE;
 269                                 devices = g_slist_append(devices, sdi);
 270                                 sdi->inst_type = SR_INST_USB;
 271                                 sdi->conn = sr_usb_dev_inst_new(
 272                                                 libusb_get_bus_number(devlist[i]),
 273                                                 libusb_get_device_address(devlist[i]), NULL);
 274                                 break;
 275                         }
 276                 }
 277                 if (!prof)
 278                         /* Not a supported VID/PID. */
 279                         continue;
 280         }
 281         libusb_free_device_list(devlist, 1);
 282
 283         return std_scan_complete(di, devices);
 284 }
 285
 286 static int dev_open(struct sr_dev_inst *sdi)
 287 {
 288         struct dev_context *devc;
 289         struct sr_usb_dev_inst *usb;
 290         int64_t timediff_us, timediff_ms;
 291         int err;
 292
 293         devc = sdi->priv;
 294         usb = sdi->conn;
 295
 296         /*
 297          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 298          * for the FX2 to renumerate.
 299          */
 300         err = SR_ERR;
 301         if (devc->fw_updated > 0) {
 302                 sr_info("Waiting for device to reset.");
 303                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 304                 g_usleep(300 * 1000);
 305                 timediff_ms = 0;
 306                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 307                         if ((err = hantek_6xxx_open(sdi)) == SR_OK)
 308                                 break;
 309                         g_usleep(100 * 1000);
 310                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 311                         timediff_ms = timediff_us / 1000;
 312                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 313                 }
 314                 if (timediff_ms < MAX_RENUM_DELAY_MS)
 315                         sr_info("Device came back after %"PRIu64" ms.", timediff_ms);
 316         } else {
 317                 err = hantek_6xxx_open(sdi);
 318         }
 319
 320         if (err != SR_OK) {
 321                 sr_err("Unable to open device.");
 322                 return SR_ERR;
 323         }
 324
 325         err = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 326         if (err != 0) {
 327                 sr_err("Unable to claim interface: %s.",
 328                         libusb_error_name(err));
 329                 return SR_ERR;
 330         }
 331
 332         return SR_OK;
 333 }
 334
 335 static int dev_close(struct sr_dev_inst *sdi)
 336 {
 337         hantek_6xxx_close(sdi);
 338
 339         return SR_OK;
 340 }
 341
 342 static int config_get(uint32_t key, GVariant **data,
 343         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 344 {
 345         struct dev_context *devc;
 346         struct sr_usb_dev_inst *usb;
 347         const uint64_t *vdiv;
 348         int ch_idx;
 349
 350         switch (key) {
 351         case SR_CONF_NUM_VDIV:
 352                 *data = g_variant_new_int32(ARRAY_SIZE(vdivs));
 353                 break;
 354         }
 355
 356         if (!sdi)
 357                 return SR_ERR_ARG;
 358
 359         devc = sdi->priv;
 360         if (!cg) {
 361                 switch (key) {
 362                 case SR_CONF_SAMPLERATE:
 363                         *data = g_variant_new_uint64(devc->samplerate);
 364                         break;
 365                 case SR_CONF_LIMIT_MSEC:
 366                         *data = g_variant_new_uint64(devc->limit_msec);
 367                         break;
 368                 case SR_CONF_LIMIT_SAMPLES:
 369                         *data = g_variant_new_uint64(devc->limit_samples);
 370                         break;
 371                 case SR_CONF_CONN:
 372                         if (!sdi->conn)
 373                                 return SR_ERR_ARG;
 374                         usb = sdi->conn;
 375                         if (usb->address == 255)
 376                                 /* Device still needs to re-enumerate after firmware
 377                                  * upload, so we don't know its (future) address. */
 378                                 return SR_ERR;
 379                         *data = g_variant_new_printf("%d.%d", usb->bus, usb->address);
 380                         break;
 381                 default:
 382                         return SR_ERR_NA;
 383                 }
 384         } else {
 385                 if (sdi->channel_groups->data == cg)
 386                         ch_idx = 0;
 387                 else if (sdi->channel_groups->next->data == cg)
 388                         ch_idx = 1;
 389                 else
 390                         return SR_ERR_ARG;
 391                 switch (key) {
 392                 case SR_CONF_VDIV:
 393                         vdiv = vdivs[devc->voltage[ch_idx]];
 394                         *data = g_variant_new("(tt)", vdiv[0], vdiv[1]);
 395                         break;
 396                 case SR_CONF_COUPLING:
 397                         *data = g_variant_new_string((devc->coupling[ch_idx] \
 398                                         == COUPLING_DC) ? "DC" : "AC");
 399                         break;
 400                 }
 401         }
 402
 403         return SR_OK;
 404 }
 405
 406 static int config_set(uint32_t key, GVariant *data,
 407         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 408 {
 409         struct dev_context *devc;
 410         int ch_idx, idx;
 411
 412         devc = sdi->priv;
 413         if (!cg) {
 414                 switch (key) {
 415                 case SR_CONF_SAMPLERATE:
 416                         devc->samplerate = g_variant_get_uint64(data);
 417                         hantek_6xxx_update_samplerate(sdi);
 418                         break;
 419                 case SR_CONF_LIMIT_MSEC:
 420                         devc->limit_msec = g_variant_get_uint64(data);
 421                         break;
 422                 case SR_CONF_LIMIT_SAMPLES:
 423                         devc->limit_samples = g_variant_get_uint64(data);
 424                         break;
 425                 default:
 426                         return SR_ERR_NA;
 427                 }
 428         } else {
 429                 if (sdi->channel_groups->data == cg)
 430                         ch_idx = 0;
 431                 else if (sdi->channel_groups->next->data == cg)
 432                         ch_idx = 1;
 433                 else
 434                         return SR_ERR_ARG;
 435                 switch (key) {
 436                 case SR_CONF_VDIV:
 437                         if ((idx = std_u64_tuple_idx(data, ARRAY_AND_SIZE(vdivs))) < 0)
 438                                 return SR_ERR_ARG;
 439                         devc->voltage[ch_idx] = idx;
 440                         hantek_6xxx_update_vdiv(sdi);
 441                         break;
 442                 case SR_CONF_COUPLING:
 443                         if ((idx = std_str_idx(data, devc->coupling_vals,
 444                                                 devc->coupling_tab_size)) < 0)
 445                                 return SR_ERR_ARG;
 446                         devc->coupling[ch_idx] = idx;
 447                         break;
 448                 default:
 449                         return SR_ERR_NA;
 450                 }
 451         }
 452
 453         return SR_OK;
 454 }
 455
 456 static int config_list(uint32_t key, GVariant **data,
 457         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 458 {
 459         struct dev_context *devc;
 460
 461         devc = (sdi) ? sdi->priv : NULL;
 462
 463         if (!cg) {
 464                 switch (key) {
 465                 case SR_CONF_SCAN_OPTIONS:
 466                 case SR_CONF_DEVICE_OPTIONS:
 467                         return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
 468                 case SR_CONF_SAMPLERATE:
 469                         *data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates));
 470                         break;
 471                 default:
 472                         return SR_ERR_NA;
 473                 }
 474         } else {
 475                 switch (key) {
 476                 case SR_CONF_DEVICE_OPTIONS:
 477                         *data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg));
 478                         break;
 479                 case SR_CONF_COUPLING:
 480                         if (!devc)
 481                                 return SR_ERR_ARG;
 482                         *data = g_variant_new_strv(devc->coupling_vals, devc->coupling_tab_size);
 483                         break;
 484                 case SR_CONF_VDIV:
 485                         *data = std_gvar_tuple_array(ARRAY_AND_SIZE(vdivs));
 486                         break;
 487                 default:
 488                         return SR_ERR_NA;
 489                 }
 490         }
 491
 492         return SR_OK;
 493 }
 494
 495 /* Minimise data amount for limit_samples and limit_msec limits. */
 496 static uint32_t data_amount(const struct sr_dev_inst *sdi)
 497 {
 498         struct dev_context *devc = sdi->priv;
 499         uint32_t data_left, data_left_2, i;
 500         int32_t time_left;
 501
 502         if (devc->limit_msec) {
 503                 time_left = devc->limit_msec - (g_get_monotonic_time() - devc->aq_started) / 1000;
 504                 data_left = devc->samplerate * MAX(time_left, 0) * NUM_CHANNELS / 1000;
 505         } else if (devc->limit_samples) {
 506                 data_left = (devc->limit_samples - devc->samp_received) * NUM_CHANNELS;
 507         } else {
 508                 data_left = devc->samplerate * NUM_CHANNELS;
 509         }
 510
 511         /* Round up to nearest power of two. */
 512         for (i = MIN_PACKET_SIZE; i < data_left; i *= 2)
 513                 ;
 514         data_left_2 = i;
 515
 516         sr_spew("data_amount: %u (rounded to power of 2: %u)", data_left, data_left_2);
 517
 518         return data_left_2;
 519 }
 520
 521 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 522                 int num_samples)
 523 {
 524         struct sr_datafeed_packet packet;
 525         struct sr_datafeed_analog analog;
 526         struct sr_analog_encoding encoding;
 527         struct sr_analog_meaning meaning;
 528         struct sr_analog_spec spec;
 529         struct dev_context *devc = sdi->priv;
 530         GSList *channels = devc->enabled_channels;
 531
 532         const float ch_bit[] = { RANGE(0) / 255, RANGE(1) / 255 };
 533         const float ch_center[] = { RANGE(0) / 2, RANGE(1) / 2 };
 534
 535         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
 536
 537         packet.type = SR_DF_ANALOG;
 538         packet.payload = &analog;
 539
 540         analog.num_samples = num_samples;
 541         analog.meaning->mq = SR_MQ_VOLTAGE;
 542         analog.meaning->unit = SR_UNIT_VOLT;
 543         analog.meaning->mqflags = 0;
 544
 545         analog.data = g_try_malloc(num_samples * sizeof(float));
 546         if (!analog.data) {
 547                 sr_err("Analog data buffer malloc failed.");
 548                 devc->dev_state = STOPPING;
 549                 return;
 550         }
 551
 552         for (int ch = 0; ch < NUM_CHANNELS; ch++) {
 553                 if (!devc->ch_enabled[ch])
 554                         continue;
 555
 556                 float vdivlog = log10f(ch_bit[ch]);
 557                 int digits = -(int)vdivlog + (vdivlog < 0.0);
 558                 analog.encoding->digits = digits;
 559                 analog.spec->spec_digits = digits;
 560                 analog.meaning->channels = g_slist_append(NULL, channels->data);
 561
 562                 for (int i = 0; i < num_samples; i++) {
 563                         /*
 564                          * The device always sends data for both channels. If a channel
 565                          * is disabled, it contains a copy of the enabled channel's
 566                          * data. However, we only send the requested channels to
 567                          * the bus.
 568                          *
 569                          * Voltage values are encoded as a value 0-255, where the
 570                          * value is a point in the range represented by the vdiv
 571                          * setting. There are 10 vertical divs, so e.g. 500mV/div
 572                          * represents 5V peak-to-peak where 0 = -2.5V and 255 = +2.5V.
 573                          */
 574                         ((float *)analog.data)[i] = ch_bit[ch] * *(buf + i * 2 + ch) - ch_center[ch];
 575                 }
 576
 577                 sr_session_send(sdi, &packet);
 578                 g_slist_free(analog.meaning->channels);
 579
 580                 channels = channels->next;
 581         }
 582         g_free(analog.data);
 583 }
 584
 585 /*
 586  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 587  * Only channel data comes in asynchronously, and all transfers for this are
 588  * queued up beforehand, so this just needs to chuck the incoming data onto
 589  * the libsigrok session bus.
 590  */
 591 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 592 {
 593         struct sr_dev_inst *sdi;
 594         struct dev_context *devc;
 595
 596         sdi = transfer->user_data;
 597         devc = sdi->priv;
 598
 599         if (devc->dev_state == FLUSH) {
 600                 g_free(transfer->buffer);
 601                 libusb_free_transfer(transfer);
 602                 devc->dev_state = CAPTURE;
 603                 devc->aq_started = g_get_monotonic_time();
 604                 read_channel(sdi, data_amount(sdi));
 605                 return;
 606         }
 607
 608         if (devc->dev_state != CAPTURE)
 609                 return;
 610
 611         sr_spew("receive_transfer(): calculated samplerate == %" PRIu64 "ks/s",
 612                 (uint64_t)(transfer->actual_length * 1000 /
 613                 (g_get_monotonic_time() - devc->read_start_ts + 1) /
 614                 NUM_CHANNELS));
 615
 616         sr_spew("receive_transfer(): status %s received %d bytes.",
 617                 libusb_error_name(transfer->status), transfer->actual_length);
 618
 619         if (transfer->actual_length == 0)
 620                 /* Nothing to send to the bus. */
 621                 return;
 622
 623         unsigned samples_received = transfer->actual_length / NUM_CHANNELS;
 624         send_chunk(sdi, transfer->buffer, samples_received);
 625         devc->samp_received += samples_received;
 626
 627         g_free(transfer->buffer);
 628         libusb_free_transfer(transfer);
 629
 630         if (devc->limit_samples && devc->samp_received >= devc->limit_samples) {
 631                 sr_info("Requested number of samples reached, stopping. %"
 632                         PRIu64 " <= %" PRIu64, devc->limit_samples,
 633                         devc->samp_received);
 634                 sr_dev_acquisition_stop(sdi);
 635         } else if (devc->limit_msec && (g_get_monotonic_time() -
 636                         devc->aq_started) / 1000 >= devc->limit_msec) {
 637                 sr_info("Requested time limit reached, stopping. %d <= %d",
 638                         (uint32_t)devc->limit_msec,
 639                         (uint32_t)(g_get_monotonic_time() - devc->aq_started) / 1000);
 640                 sr_dev_acquisition_stop(sdi);
 641         } else {
 642                 read_channel(sdi, data_amount(sdi));
 643         }
 644 }
 645
 646 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount)
 647 {
 648         int ret;
 649         struct dev_context *devc;
 650
 651         devc = sdi->priv;
 652
 653         amount = MIN(amount, MAX_PACKET_SIZE);
 654         ret = hantek_6xxx_get_channeldata(sdi, receive_transfer, amount);
 655         devc->read_start_ts = g_get_monotonic_time();
 656
 657         return ret;
 658 }
 659
 660 static int handle_event(int fd, int revents, void *cb_data)
 661 {
 662         const struct sr_dev_inst *sdi;
 663         struct timeval tv;
 664         struct sr_dev_driver *di;
 665         struct dev_context *devc;
 666         struct drv_context *drvc;
 667
 668         (void)fd;
 669         (void)revents;
 670
 671         sdi = cb_data;
 672         di = sdi->driver;
 673         drvc = di->context;
 674         devc = sdi->priv;
 675
 676         /* Always handle pending libusb events. */
 677         tv.tv_sec = tv.tv_usec = 0;
 678         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 679
 680         if (devc->dev_state == STOPPING) {
 681                 /* We've been told to wind up the acquisition. */
 682                 sr_dbg("Stopping acquisition.");
 683
 684                 hantek_6xxx_stop_data_collecting(sdi);
 685                 /*
 686                  * TODO: Doesn't really cancel pending transfers so they might
 687                  * come in after SR_DF_END is sent.
 688                  */
 689                 usb_source_remove(sdi->session, drvc->sr_ctx);
 690
 691                 std_session_send_df_end(sdi);
 692
 693                 devc->dev_state = IDLE;
 694
 695                 return TRUE;
 696         }
 697
 698         return TRUE;
 699 }
 700
 701 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 702 {
 703         struct dev_context *devc;
 704         struct sr_dev_driver *di = sdi->driver;
 705         struct drv_context *drvc = di->context;
 706
 707         devc = sdi->priv;
 708
 709         if (configure_channels(sdi) != SR_OK) {
 710                 sr_err("Failed to configure channels.");
 711                 return SR_ERR;
 712         }
 713
 714         if (hantek_6xxx_init(sdi) != SR_OK)
 715                 return SR_ERR;
 716
 717         std_session_send_df_header(sdi);
 718
 719         devc->samp_received = 0;
 720         devc->dev_state = FLUSH;
 721
 722         usb_source_add(sdi->session, drvc->sr_ctx, TICK,
 723                        handle_event, (void *)sdi);
 724
 725         hantek_6xxx_start_data_collecting(sdi);
 726
 727         read_channel(sdi, FLUSH_PACKET_SIZE);
 728
 729         return SR_OK;
 730 }
 731
 732 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 733 {
 734         struct dev_context *devc;
 735
 736         devc = sdi->priv;
 737         devc->dev_state = STOPPING;
 738
 739         return SR_OK;
 740 }
 741
 742 static struct sr_dev_driver hantek_6xxx_driver_info = {
 743         .name = "hantek-6xxx",
 744         .longname = "Hantek 6xxx",
 745         .api_version = 1,
 746         .init = std_init,
 747         .cleanup = std_cleanup,
 748         .scan = scan,
 749         .dev_list = std_dev_list,
 750         .dev_clear = dev_clear,
 751         .config_get = config_get,
 752         .config_set = config_set,
 753         .config_list = config_list,
 754         .dev_open = dev_open,
 755         .dev_close = dev_close,
 756         .dev_acquisition_start = dev_acquisition_start,
 757         .dev_acquisition_stop = dev_acquisition_stop,
 758         .context = NULL,
 759 };
 760 SR_REGISTER_DEV_DRIVER(hantek_6xxx_driver_info);