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                 dc_coupling, ARRAY_SIZE(dc_coupling), FALSE,
  67         },
  68         {
  69                 0x8102, 0x8102, 0x1d50, 0x608e, 0x0002,
  70                 "Sainsmart", "DDS120", "fx2lafw-sainsmart-dds120.fw",
  71                 acdc_coupling, ARRAY_SIZE(acdc_coupling), TRUE,
  72         },
  73         {
  74                 0x04b4, 0x602a, 0x1d50, 0x608e, 0x0003,
  75                 "Hantek", "6022BL", "fx2lafw-hantek-6022bl.fw",
  76                 dc_coupling, ARRAY_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->sample_buf = NULL;
 124         devc->sample_buf_write = 0;
 125         devc->sample_buf_size = 0;
 126
 127         devc->profile = prof;
 128         devc->dev_state = IDLE;
 129         devc->samplerate = DEFAULT_SAMPLERATE;
 130
 131         sdi->priv = devc;
 132
 133         return sdi;
 134 }
 135
 136 static int configure_channels(const struct sr_dev_inst *sdi)
 137 {
 138         struct dev_context *devc;
 139         const GSList *l;
 140         int p;
 141         struct sr_channel *ch;
 142         devc = sdi->priv;
 143
 144         g_slist_free(devc->enabled_channels);
 145         devc->enabled_channels = NULL;
 146         memset(devc->ch_enabled, 0, sizeof(devc->ch_enabled));
 147
 148         for (l = sdi->channels, p = 0; l; l = l->next, p++) {
 149                 ch = l->data;
 150                 if (p < NUM_CHANNELS) {
 151                         devc->ch_enabled[p] = ch->enabled;
 152                         devc->enabled_channels = g_slist_append(devc->enabled_channels, ch);
 153                 }
 154         }
 155
 156         return SR_OK;
 157 }
 158
 159 static void clear_helper(void *priv)
 160 {
 161         struct dev_context *devc;
 162
 163         devc = priv;
 164         g_slist_free(devc->enabled_channels);
 165 }
 166
 167 static int dev_clear(const struct sr_dev_driver *di)
 168 {
 169         return std_dev_clear_with_callback(di, clear_helper);
 170 }
 171
 172 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 173 {
 174         struct drv_context *drvc;
 175         struct dev_context *devc;
 176         struct sr_dev_inst *sdi;
 177         struct sr_usb_dev_inst *usb;
 178         struct sr_config *src;
 179         const struct hantek_6xxx_profile *prof;
 180         GSList *l, *devices, *conn_devices;
 181         struct libusb_device_descriptor des;
 182         libusb_device **devlist;
 183         int i, j;
 184         const char *conn;
 185         char connection_id[64];
 186
 187         drvc = di->context;
 188
 189         devices = 0;
 190
 191         conn = NULL;
 192         for (l = options; l; l = l->next) {
 193                 src = l->data;
 194                 if (src->key == SR_CONF_CONN) {
 195                         conn = g_variant_get_string(src->data, NULL);
 196                         break;
 197                 }
 198         }
 199         if (conn)
 200                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 201         else
 202                 conn_devices = NULL;
 203
 204         /* Find all Hantek 60xx devices and upload firmware to all of them. */
 205         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 206         for (i = 0; devlist[i]; i++) {
 207                 if (conn) {
 208                         usb = NULL;
 209                         for (l = conn_devices; l; l = l->next) {
 210                                 usb = l->data;
 211                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 212                                         && usb->address == libusb_get_device_address(devlist[i]))
 213                                         break;
 214                         }
 215                         if (!l)
 216                                 /* This device matched none of the ones that
 217                                  * matched the conn specification. */
 218                                 continue;
 219                 }
 220
 221                 libusb_get_device_descriptor(devlist[i], &des);
 222
 223                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 224
 225                 prof = NULL;
 226                 for (j = 0; dev_profiles[j].orig_vid; j++) {
 227                         if (des.idVendor == dev_profiles[j].orig_vid
 228                                 && des.idProduct == dev_profiles[j].orig_pid) {
 229                                 /* Device matches the pre-firmware profile. */
 230                                 prof = &dev_profiles[j];
 231                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 232                                 sdi = hantek_6xxx_dev_new(prof);
 233                                 sdi->connection_id = g_strdup(connection_id);
 234                                 devices = g_slist_append(devices, sdi);
 235                                 devc = sdi->priv;
 236                                 if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 237                                                 USB_CONFIGURATION, prof->firmware) == SR_OK)
 238                                         /* Remember when the firmware on this device was updated. */
 239                                         devc->fw_updated = g_get_monotonic_time();
 240                                 else
 241                                         sr_err("Firmware upload failed.");
 242                                 /* Dummy USB address of 0xff will get overwritten later. */
 243                                 sdi->conn = sr_usb_dev_inst_new(
 244                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 245                                 break;
 246                         } else if (des.idVendor == dev_profiles[j].fw_vid
 247                                 && des.idProduct == dev_profiles[j].fw_pid
 248                                 && des.bcdDevice == dev_profiles[j].fw_prod_ver) {
 249                                 /* Device matches the post-firmware profile. */
 250                                 prof = &dev_profiles[j];
 251                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 252                                 sdi = hantek_6xxx_dev_new(prof);
 253                                 sdi->connection_id = g_strdup(connection_id);
 254                                 sdi->status = SR_ST_INACTIVE;
 255                                 devices = g_slist_append(devices, sdi);
 256                                 sdi->inst_type = SR_INST_USB;
 257                                 sdi->conn = sr_usb_dev_inst_new(
 258                                                 libusb_get_bus_number(devlist[i]),
 259                                                 libusb_get_device_address(devlist[i]), NULL);
 260                                 break;
 261                         }
 262                 }
 263                 if (!prof)
 264                         /* Not a supported VID/PID. */
 265                         continue;
 266         }
 267         libusb_free_device_list(devlist, 1);
 268
 269         return std_scan_complete(di, devices);
 270 }
 271
 272 static int dev_open(struct sr_dev_inst *sdi)
 273 {
 274         struct dev_context *devc;
 275         struct sr_usb_dev_inst *usb;
 276         int64_t timediff_us, timediff_ms;
 277         int err;
 278
 279         devc = sdi->priv;
 280         usb = sdi->conn;
 281
 282         /*
 283          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 284          * for the FX2 to renumerate.
 285          */
 286         err = SR_ERR;
 287         if (devc->fw_updated > 0) {
 288                 sr_info("Waiting for device to reset.");
 289                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 290                 g_usleep(300 * 1000);
 291                 timediff_ms = 0;
 292                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 293                         if ((err = hantek_6xxx_open(sdi)) == SR_OK)
 294                                 break;
 295                         g_usleep(100 * 1000);
 296                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 297                         timediff_ms = timediff_us / 1000;
 298                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 299                 }
 300                 if (timediff_ms < MAX_RENUM_DELAY_MS)
 301                         sr_info("Device came back after %"PRIu64" ms.", timediff_ms);
 302         } else {
 303                 err = hantek_6xxx_open(sdi);
 304         }
 305
 306         if (err != SR_OK) {
 307                 sr_err("Unable to open device.");
 308                 return SR_ERR;
 309         }
 310
 311         err = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 312         if (err != 0) {
 313                 sr_err("Unable to claim interface: %s.",
 314                         libusb_error_name(err));
 315                 return SR_ERR;
 316         }
 317
 318         return SR_OK;
 319 }
 320
 321 static int dev_close(struct sr_dev_inst *sdi)
 322 {
 323         hantek_6xxx_close(sdi);
 324
 325         return SR_OK;
 326 }
 327
 328 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 329                 const struct sr_channel_group *cg)
 330 {
 331         struct dev_context *devc;
 332         struct sr_usb_dev_inst *usb;
 333         char str[128];
 334         const uint64_t *vdiv;
 335         int ch_idx;
 336
 337         switch (key) {
 338         case SR_CONF_NUM_VDIV:
 339                 *data = g_variant_new_int32(ARRAY_SIZE(vdivs));
 340                 break;
 341         }
 342
 343         if (!sdi)
 344                 return SR_ERR_ARG;
 345
 346         devc = sdi->priv;
 347         if (!cg) {
 348                 switch (key) {
 349                 case SR_CONF_SAMPLERATE:
 350                         *data = g_variant_new_uint64(devc->samplerate);
 351                         break;
 352                 case SR_CONF_LIMIT_MSEC:
 353                         *data = g_variant_new_uint64(devc->limit_msec);
 354                         break;
 355                 case SR_CONF_LIMIT_SAMPLES:
 356                         *data = g_variant_new_uint64(devc->limit_samples);
 357                         break;
 358                 case SR_CONF_CONN:
 359                         if (!sdi->conn)
 360                                 return SR_ERR_ARG;
 361                         usb = sdi->conn;
 362                         if (usb->address == 255)
 363                                 /* Device still needs to re-enumerate after firmware
 364                                  * upload, so we don't know its (future) address. */
 365                                 return SR_ERR;
 366                         snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 367                         *data = g_variant_new_string(str);
 368                         break;
 369                 default:
 370                         return SR_ERR_NA;
 371                 }
 372         } else {
 373                 if (sdi->channel_groups->data == cg)
 374                         ch_idx = 0;
 375                 else if (sdi->channel_groups->next->data == cg)
 376                         ch_idx = 1;
 377                 else
 378                         return SR_ERR_ARG;
 379                 switch (key) {
 380                 case SR_CONF_VDIV:
 381                         vdiv = vdivs[devc->voltage[ch_idx]];
 382                         *data = g_variant_new("(tt)", vdiv[0], vdiv[1]);
 383                         break;
 384                 case SR_CONF_COUPLING:
 385                         *data = g_variant_new_string((devc->coupling[ch_idx] \
 386                                         == COUPLING_DC) ? "DC" : "AC");
 387                         break;
 388                 }
 389         }
 390
 391         return SR_OK;
 392 }
 393
 394 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 395                 const struct sr_channel_group *cg)
 396 {
 397         struct dev_context *devc;
 398         uint64_t p, q;
 399         int tmp_int, ch_idx, ret;
 400         unsigned int i;
 401         const char *tmp_str;
 402
 403         ret = SR_OK;
 404         devc = sdi->priv;
 405         if (!cg) {
 406                 switch (key) {
 407                 case SR_CONF_SAMPLERATE:
 408                         devc->samplerate = g_variant_get_uint64(data);
 409                         hantek_6xxx_update_samplerate(sdi);
 410                         break;
 411                 case SR_CONF_LIMIT_MSEC:
 412                         devc->limit_msec = g_variant_get_uint64(data);
 413                         break;
 414                 case SR_CONF_LIMIT_SAMPLES:
 415                         devc->limit_samples = g_variant_get_uint64(data);
 416                         break;
 417                 default:
 418                         ret = SR_ERR_NA;
 419                         break;
 420                 }
 421         } else {
 422                 if (sdi->channel_groups->data == cg)
 423                         ch_idx = 0;
 424                 else if (sdi->channel_groups->next->data == cg)
 425                         ch_idx = 1;
 426                 else
 427                         return SR_ERR_ARG;
 428                 switch (key) {
 429                 case SR_CONF_VDIV:
 430                         g_variant_get(data, "(tt)", &p, &q);
 431                         tmp_int = -1;
 432                         for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 433                                 if (vdivs[i][0] == p && vdivs[i][1] == q) {
 434                                         tmp_int = i;
 435                                         break;
 436                                 }
 437                         }
 438                         if (tmp_int >= 0) {
 439                                 devc->voltage[ch_idx] = tmp_int;
 440                                 hantek_6xxx_update_vdiv(sdi);
 441                         } else
 442                                 ret = SR_ERR_ARG;
 443                         break;
 444                 case SR_CONF_COUPLING:
 445                         tmp_str = g_variant_get_string(data, NULL);
 446                         for (i = 0; i < devc->coupling_tab_size; i++) {
 447                                 if (!strcmp(tmp_str, devc->coupling_vals[i])) {
 448                                         devc->coupling[ch_idx] = i;
 449                                         break;
 450                                 }
 451                         }
 452                         if (i == devc->coupling_tab_size)
 453                                 ret = SR_ERR_ARG;
 454                         break;
 455                 default:
 456                         ret = SR_ERR_NA;
 457                         break;
 458                 }
 459         }
 460
 461         return ret;
 462 }
 463
 464 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 465                 const struct sr_channel_group *cg)
 466 {
 467         GVariant *tuple, *rational[2];
 468         GVariantBuilder gvb;
 469         unsigned int i;
 470         GVariant *gvar;
 471         struct dev_context *devc = NULL;
 472
 473         if (key == SR_CONF_SCAN_OPTIONS) {
 474                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 475                         scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 476                 return SR_OK;
 477         } else if (key == SR_CONF_DEVICE_OPTIONS && !sdi) {
 478                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 479                         drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
 480                 return SR_OK;
 481         }
 482
 483         if (sdi)
 484                 devc = sdi->priv;
 485
 486         if (!cg) {
 487                 switch (key) {
 488                 case SR_CONF_DEVICE_OPTIONS:
 489                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 490                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 491                         break;
 492                 case SR_CONF_SAMPLERATE:
 493                         g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 494                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 495                                 samplerates, ARRAY_SIZE(samplerates),
 496                                 sizeof(uint64_t));
 497                         g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 498                         *data = g_variant_builder_end(&gvb);
 499                         break;
 500                 default:
 501                         return SR_ERR_NA;
 502                 }
 503         } else {
 504                 switch (key) {
 505                 case SR_CONF_DEVICE_OPTIONS:
 506                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 507                                 devopts_cg, ARRAY_SIZE(devopts_cg), sizeof(uint32_t));
 508                         break;
 509                 case SR_CONF_COUPLING:
 510                         if (!devc)
 511                                 return SR_ERR_NA;
 512                         *data = g_variant_new_strv(devc->coupling_vals, devc->coupling_tab_size);
 513                         break;
 514                 case SR_CONF_VDIV:
 515                         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 516                         for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 517                                 rational[0] = g_variant_new_uint64(vdivs[i][0]);
 518                                 rational[1] = g_variant_new_uint64(vdivs[i][1]);
 519                                 tuple = g_variant_new_tuple(rational, 2);
 520                                 g_variant_builder_add_value(&gvb, tuple);
 521                         }
 522                         *data = g_variant_builder_end(&gvb);
 523                         break;
 524                 default:
 525                         return SR_ERR_NA;
 526                 }
 527         }
 528
 529         return SR_OK;
 530 }
 531
 532 /* Minimise data amount for limit_samples and limit_msec limits. */
 533 static uint32_t data_amount(const struct sr_dev_inst *sdi)
 534 {
 535         struct dev_context *devc = sdi->priv;
 536         uint32_t data_left, data_left_2, i;
 537         int32_t time_left;
 538
 539         if (devc->limit_msec) {
 540                 time_left = devc->limit_msec - (g_get_monotonic_time() - devc->aq_started) / 1000;
 541                 data_left = devc->samplerate * MAX(time_left, 0) * NUM_CHANNELS / 1000;
 542         } else if (devc->limit_samples) {
 543                 data_left = (devc->limit_samples - devc->samp_received) * NUM_CHANNELS;
 544         } else {
 545                 data_left = devc->samplerate * NUM_CHANNELS;
 546         }
 547
 548         /* Round up to nearest power of two. */
 549         for (i = MIN_PACKET_SIZE; i < data_left; i *= 2)
 550                 ;
 551         data_left_2 = i;
 552
 553         sr_spew("data_amount: %u (rounded to power of 2: %u)", data_left, data_left_2);
 554
 555         return data_left_2;
 556 }
 557
 558 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 559                 int num_samples)
 560 {
 561         struct sr_datafeed_packet packet;
 562         struct sr_datafeed_analog analog;
 563         struct sr_analog_encoding encoding;
 564         struct sr_analog_meaning meaning;
 565         struct sr_analog_spec spec;
 566         struct dev_context *devc = sdi->priv;
 567         GSList *channels = devc->enabled_channels;
 568
 569         const float ch_bit[] = { RANGE(0) / 255, RANGE(1) / 255 };
 570         const float ch_center[] = { RANGE(0) / 2, RANGE(1) / 2 };
 571
 572         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
 573
 574         packet.type = SR_DF_ANALOG;
 575         packet.payload = &analog;
 576
 577         analog.num_samples = num_samples;
 578         analog.meaning->mq = SR_MQ_VOLTAGE;
 579         analog.meaning->unit = SR_UNIT_VOLT;
 580         analog.meaning->mqflags = 0;
 581
 582         analog.data = g_try_malloc(num_samples * sizeof(float));
 583         if (!analog.data) {
 584                 sr_err("Analog data buffer malloc failed.");
 585                 devc->dev_state = STOPPING;
 586                 return;
 587         }
 588
 589         for (int ch = 0; ch < 2; ch++) {
 590                 if (!devc->ch_enabled[ch])
 591                         continue;
 592
 593                 float vdivlog = log10f(ch_bit[ch]);
 594                 int digits = -(int)vdivlog + (vdivlog < 0.0);
 595                 analog.encoding->digits = digits;
 596                 analog.spec->spec_digits = digits;
 597                 analog.meaning->channels = g_slist_append(NULL, channels->data);
 598
 599                 for (int i = 0; i < num_samples; i++) {
 600                         /*
 601                          * The device always sends data for both channels. If a channel
 602                          * is disabled, it contains a copy of the enabled channel's
 603                          * data. However, we only send the requested channels to
 604                          * the bus.
 605                          *
 606                          * Voltage values are encoded as a value 0-255, where the
 607                          * value is a point in the range represented by the vdiv
 608                          * setting. There are 10 vertical divs, so e.g. 500mV/div
 609                          * represents 5V peak-to-peak where 0 = -2.5V and 255 = +2.5V.
 610                          */
 611                         ((float *)analog.data)[i] = ch_bit[ch] * *(buf + i * 2 + ch) - ch_center[ch];
 612                 }
 613
 614                 sr_session_send(sdi, &packet);
 615                 g_slist_free(analog.meaning->channels);
 616
 617                 channels = channels->next;
 618         }
 619         g_free(analog.data);
 620 }
 621
 622 static void send_data(struct sr_dev_inst *sdi, struct libusb_transfer *buf[], uint64_t samples)
 623 {
 624         int i = 0;
 625         uint64_t send = 0;
 626         uint32_t chunk;
 627
 628         while (send < samples) {
 629                 chunk = MIN(samples - send, (uint64_t)(buf[i]->actual_length / NUM_CHANNELS));
 630                 send += chunk;
 631                 send_chunk(sdi, buf[i]->buffer, chunk);
 632
 633                 /*
 634                  * Everything in this transfer was either copied to the buffer
 635                  * or sent to the session bus.
 636                  */
 637                 g_free(buf[i]->buffer);
 638                 libusb_free_transfer(buf[i]);
 639                 i++;
 640         }
 641 }
 642
 643 /*
 644  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 645  * Only channel data comes in asynchronously, and all transfers for this are
 646  * queued up beforehand, so this just needs to chuck the incoming data onto
 647  * the libsigrok session bus.
 648  */
 649 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 650 {
 651         struct sr_dev_inst *sdi;
 652         struct dev_context *devc;
 653
 654         sdi = transfer->user_data;
 655         devc = sdi->priv;
 656
 657         if (devc->dev_state == FLUSH) {
 658                 g_free(transfer->buffer);
 659                 libusb_free_transfer(transfer);
 660                 devc->dev_state = CAPTURE;
 661                 devc->aq_started = g_get_monotonic_time();
 662                 read_channel(sdi, data_amount(sdi));
 663                 return;
 664         }
 665
 666         if (devc->dev_state != CAPTURE)
 667                 return;
 668
 669         if (!devc->sample_buf) {
 670                 devc->sample_buf_size = 10;
 671                 devc->sample_buf = g_try_malloc(devc->sample_buf_size * sizeof(transfer));
 672                 devc->sample_buf_write = 0;
 673         }
 674
 675         if (devc->sample_buf_write >= devc->sample_buf_size) {
 676                 devc->sample_buf_size += 10;
 677                 devc->sample_buf = g_try_realloc(devc->sample_buf,
 678                                 devc->sample_buf_size * sizeof(transfer));
 679                 if (!devc->sample_buf) {
 680                         sr_err("Sample buffer malloc failed.");
 681                         devc->dev_state = STOPPING;
 682                         return;
 683                 }
 684         }
 685
 686         devc->sample_buf[devc->sample_buf_write++] = transfer;
 687         devc->samp_received += transfer->actual_length / NUM_CHANNELS;
 688
 689         sr_spew("receive_transfer(): calculated samplerate == %" PRIu64 "ks/s",
 690                 (uint64_t)(transfer->actual_length * 1000 /
 691                 (g_get_monotonic_time() - devc->read_start_ts + 1) /
 692                 NUM_CHANNELS));
 693
 694         sr_spew("receive_transfer(): status %s received %d bytes.",
 695                 libusb_error_name(transfer->status), transfer->actual_length);
 696
 697         if (transfer->actual_length == 0)
 698                 /* Nothing to send to the bus. */
 699                 return;
 700
 701         if (devc->limit_samples && devc->samp_received >= devc->limit_samples) {
 702                 sr_info("Requested number of samples reached, stopping. %"
 703                         PRIu64 " <= %" PRIu64, devc->limit_samples,
 704                         devc->samp_received);
 705                 send_data(sdi, devc->sample_buf, devc->limit_samples);
 706                 sr_dev_acquisition_stop(sdi);
 707         } else if (devc->limit_msec && (g_get_monotonic_time() -
 708                         devc->aq_started) / 1000 >= devc->limit_msec) {
 709                 sr_info("Requested time limit reached, stopping. %d <= %d",
 710                         (uint32_t)devc->limit_msec,
 711                         (uint32_t)(g_get_monotonic_time() - devc->aq_started) / 1000);
 712                 send_data(sdi, devc->sample_buf, devc->samp_received);
 713                 g_free(devc->sample_buf);
 714                 devc->sample_buf = NULL;
 715                 sr_dev_acquisition_stop(sdi);
 716         } else {
 717                 read_channel(sdi, data_amount(sdi));
 718         }
 719 }
 720
 721 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount)
 722 {
 723         int ret;
 724         struct dev_context *devc;
 725
 726         devc = sdi->priv;
 727
 728         amount = MIN(amount, MAX_PACKET_SIZE);
 729         ret = hantek_6xxx_get_channeldata(sdi, receive_transfer, amount);
 730         devc->read_start_ts = g_get_monotonic_time();
 731         devc->read_data_amount = amount;
 732
 733         return ret;
 734 }
 735
 736 static int handle_event(int fd, int revents, void *cb_data)
 737 {
 738         const struct sr_dev_inst *sdi;
 739         struct timeval tv;
 740         struct sr_dev_driver *di;
 741         struct dev_context *devc;
 742         struct drv_context *drvc;
 743
 744         (void)fd;
 745         (void)revents;
 746
 747         sdi = cb_data;
 748         di = sdi->driver;
 749         drvc = di->context;
 750         devc = sdi->priv;
 751
 752         /* Always handle pending libusb events. */
 753         tv.tv_sec = tv.tv_usec = 0;
 754         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 755
 756         if (devc->dev_state == STOPPING) {
 757                 /* We've been told to wind up the acquisition. */
 758                 sr_dbg("Stopping acquisition.");
 759
 760                 hantek_6xxx_stop_data_collecting(sdi);
 761                 /*
 762                  * TODO: Doesn't really cancel pending transfers so they might
 763                  * come in after SR_DF_END is sent.
 764                  */
 765                 usb_source_remove(sdi->session, drvc->sr_ctx);
 766
 767                 std_session_send_df_end(sdi);
 768
 769                 devc->dev_state = IDLE;
 770
 771                 return TRUE;
 772         }
 773
 774         return TRUE;
 775 }
 776
 777 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 778 {
 779         struct dev_context *devc;
 780         struct sr_dev_driver *di = sdi->driver;
 781         struct drv_context *drvc = di->context;
 782
 783         devc = sdi->priv;
 784
 785         if (configure_channels(sdi) != SR_OK) {
 786                 sr_err("Failed to configure channels.");
 787                 return SR_ERR;
 788         }
 789
 790         if (hantek_6xxx_init(sdi) != SR_OK)
 791                 return SR_ERR;
 792
 793         std_session_send_df_header(sdi);
 794
 795         devc->samp_received = 0;
 796         devc->dev_state = FLUSH;
 797
 798         usb_source_add(sdi->session, drvc->sr_ctx, TICK,
 799                        handle_event, (void *)sdi);
 800
 801         hantek_6xxx_start_data_collecting(sdi);
 802
 803         read_channel(sdi, FLUSH_PACKET_SIZE);
 804
 805         return SR_OK;
 806 }
 807
 808 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 809 {
 810         struct dev_context *devc;
 811
 812         devc = sdi->priv;
 813         devc->dev_state = STOPPING;
 814
 815         g_free(devc->sample_buf);
 816         devc->sample_buf = NULL;
 817
 818         return SR_OK;
 819 }
 820
 821 static struct sr_dev_driver hantek_6xxx_driver_info = {
 822         .name = "hantek-6xxx",
 823         .longname = "Hantek 6xxx",
 824         .api_version = 1,
 825         .init = std_init,
 826         .cleanup = std_cleanup,
 827         .scan = scan,
 828         .dev_list = std_dev_list,
 829         .dev_clear = dev_clear,
 830         .config_get = config_get,
 831         .config_set = config_set,
 832         .config_list = config_list,
 833         .dev_open = dev_open,
 834         .dev_close = dev_close,
 835         .dev_acquisition_start = dev_acquisition_start,
 836         .dev_acquisition_stop = dev_acquisition_stop,
 837         .context = NULL,
 838 };
 839 SR_REGISTER_DEV_DRIVER(hantek_6xxx_driver_info);