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", "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 int dev_acquisition_stop(struct sr_dev_inst *sdi);
  92
  93 static struct sr_dev_inst *hantek_6xxx_dev_new(const struct hantek_6xxx_profile *prof)
  94 {
  95         struct sr_dev_inst *sdi;
  96         struct sr_channel *ch;
  97         struct sr_channel_group *cg;
  98         struct dev_context *devc;
  99         unsigned int i;
 100
 101         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 102         sdi->status = SR_ST_INITIALIZING;
 103         sdi->vendor = g_strdup(prof->vendor);
 104         sdi->model = g_strdup(prof->model);
 105
 106         for (i = 0; i < ARRAY_SIZE(channel_names); i++) {
 107                 ch = sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE, channel_names[i]);
 108                 cg = g_malloc0(sizeof(struct sr_channel_group));
 109                 cg->name = g_strdup(channel_names[i]);
 110                 cg->channels = g_slist_append(cg->channels, ch);
 111                 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 112         }
 113
 114         devc = g_malloc0(sizeof(struct dev_context));
 115
 116         for (i = 0; i < NUM_CHANNELS; i++) {
 117                 devc->ch_enabled[i] = TRUE;
 118                 devc->voltage[i] = DEFAULT_VOLTAGE;
 119                 devc->coupling[i] = DEFAULT_COUPLING;
 120         }
 121         devc->coupling_vals = prof->coupling_vals;
 122         devc->coupling_tab_size = prof->coupling_tab_size;
 123         devc->has_coupling = prof->has_coupling;
 124
 125         devc->sample_buf = NULL;
 126         devc->sample_buf_write = 0;
 127         devc->sample_buf_size = 0;
 128
 129         devc->profile = prof;
 130         devc->dev_state = IDLE;
 131         devc->samplerate = DEFAULT_SAMPLERATE;
 132
 133         sdi->priv = devc;
 134
 135         return sdi;
 136 }
 137
 138 static int configure_channels(const struct sr_dev_inst *sdi)
 139 {
 140         struct dev_context *devc;
 141         const GSList *l;
 142         int p;
 143         struct sr_channel *ch;
 144         devc = sdi->priv;
 145
 146         g_slist_free(devc->enabled_channels);
 147         devc->enabled_channels = NULL;
 148         memset(devc->ch_enabled, 0, sizeof(devc->ch_enabled));
 149
 150         for (l = sdi->channels, p = 0; l; l = l->next, p++) {
 151                 ch = l->data;
 152                 if (p < NUM_CHANNELS) {
 153                         devc->ch_enabled[p] = ch->enabled;
 154                         devc->enabled_channels = g_slist_append(devc->enabled_channels, ch);
 155                 }
 156         }
 157
 158         return SR_OK;
 159 }
 160
 161 static void clear_dev_context(void *priv)
 162 {
 163         struct dev_context *devc;
 164
 165         devc = priv;
 166         g_slist_free(devc->enabled_channels);
 167         g_free(devc);
 168 }
 169
 170 static int dev_clear(const struct sr_dev_driver *di)
 171 {
 172         return std_dev_clear(di, clear_dev_context);
 173 }
 174
 175 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 176 {
 177         struct drv_context *drvc;
 178         struct dev_context *devc;
 179         struct sr_dev_inst *sdi;
 180         struct sr_usb_dev_inst *usb;
 181         struct sr_config *src;
 182         const struct hantek_6xxx_profile *prof;
 183         GSList *l, *devices, *conn_devices;
 184         struct libusb_device_descriptor des;
 185         libusb_device **devlist;
 186         int i, j;
 187         const char *conn;
 188         char connection_id[64];
 189
 190         drvc = di->context;
 191
 192         devices = 0;
 193
 194         conn = NULL;
 195         for (l = options; l; l = l->next) {
 196                 src = l->data;
 197                 if (src->key == SR_CONF_CONN) {
 198                         conn = g_variant_get_string(src->data, NULL);
 199                         break;
 200                 }
 201         }
 202         if (conn)
 203                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 204         else
 205                 conn_devices = NULL;
 206
 207         /* Find all Hantek 60xx devices and upload firmware to all of them. */
 208         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 209         for (i = 0; devlist[i]; i++) {
 210                 if (conn) {
 211                         usb = NULL;
 212                         for (l = conn_devices; l; l = l->next) {
 213                                 usb = l->data;
 214                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 215                                         && usb->address == libusb_get_device_address(devlist[i]))
 216                                         break;
 217                         }
 218                         if (!l)
 219                                 /* This device matched none of the ones that
 220                                  * matched the conn specification. */
 221                                 continue;
 222                 }
 223
 224                 libusb_get_device_descriptor(devlist[i], &des);
 225
 226                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 227
 228                 prof = NULL;
 229                 for (j = 0; dev_profiles[j].orig_vid; j++) {
 230                         if (des.idVendor == dev_profiles[j].orig_vid
 231                                 && des.idProduct == dev_profiles[j].orig_pid) {
 232                                 /* Device matches the pre-firmware profile. */
 233                                 prof = &dev_profiles[j];
 234                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 235                                 sdi = hantek_6xxx_dev_new(prof);
 236                                 sdi->connection_id = g_strdup(connection_id);
 237                                 devices = g_slist_append(devices, sdi);
 238                                 devc = sdi->priv;
 239                                 if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 240                                                 USB_CONFIGURATION, prof->firmware) == SR_OK)
 241                                         /* Remember when the firmware on this device was updated. */
 242                                         devc->fw_updated = g_get_monotonic_time();
 243                                 else
 244                                         sr_err("Firmware upload failed.");
 245                                 /* Dummy USB address of 0xff will get overwritten later. */
 246                                 sdi->conn = sr_usb_dev_inst_new(
 247                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 248                                 break;
 249                         } else if (des.idVendor == dev_profiles[j].fw_vid
 250                                 && des.idProduct == dev_profiles[j].fw_pid
 251                                 && des.bcdDevice == dev_profiles[j].fw_prod_ver) {
 252                                 /* Device matches the post-firmware profile. */
 253                                 prof = &dev_profiles[j];
 254                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 255                                 sdi = hantek_6xxx_dev_new(prof);
 256                                 sdi->connection_id = g_strdup(connection_id);
 257                                 sdi->status = SR_ST_INACTIVE;
 258                                 devices = g_slist_append(devices, sdi);
 259                                 sdi->inst_type = SR_INST_USB;
 260                                 sdi->conn = sr_usb_dev_inst_new(
 261                                                 libusb_get_bus_number(devlist[i]),
 262                                                 libusb_get_device_address(devlist[i]), NULL);
 263                                 break;
 264                         }
 265                 }
 266                 if (!prof)
 267                         /* Not a supported VID/PID. */
 268                         continue;
 269         }
 270         libusb_free_device_list(devlist, 1);
 271
 272         return std_scan_complete(di, devices);
 273 }
 274
 275 static int dev_open(struct sr_dev_inst *sdi)
 276 {
 277         struct dev_context *devc;
 278         struct sr_usb_dev_inst *usb;
 279         int64_t timediff_us, timediff_ms;
 280         int err;
 281
 282         devc = sdi->priv;
 283         usb = sdi->conn;
 284
 285         /*
 286          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 287          * for the FX2 to renumerate.
 288          */
 289         err = SR_ERR;
 290         if (devc->fw_updated > 0) {
 291                 sr_info("Waiting for device to reset.");
 292                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 293                 g_usleep(300 * 1000);
 294                 timediff_ms = 0;
 295                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 296                         if ((err = hantek_6xxx_open(sdi)) == SR_OK)
 297                                 break;
 298                         g_usleep(100 * 1000);
 299                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 300                         timediff_ms = timediff_us / 1000;
 301                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 302                 }
 303                 if (timediff_ms < MAX_RENUM_DELAY_MS)
 304                         sr_info("Device came back after %"PRIu64" ms.", timediff_ms);
 305         } else {
 306                 err = hantek_6xxx_open(sdi);
 307         }
 308
 309         if (err != SR_OK) {
 310                 sr_err("Unable to open device.");
 311                 return SR_ERR;
 312         }
 313
 314         err = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 315         if (err != 0) {
 316                 sr_err("Unable to claim interface: %s.",
 317                         libusb_error_name(err));
 318                 return SR_ERR;
 319         }
 320
 321         return SR_OK;
 322 }
 323
 324 static int dev_close(struct sr_dev_inst *sdi)
 325 {
 326         hantek_6xxx_close(sdi);
 327
 328         return SR_OK;
 329 }
 330
 331 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 332                 const struct sr_channel_group *cg)
 333 {
 334         struct dev_context *devc;
 335         struct sr_usb_dev_inst *usb;
 336         char str[128];
 337         const uint64_t *vdiv;
 338         int ch_idx;
 339
 340         switch (key) {
 341         case SR_CONF_NUM_VDIV:
 342                 *data = g_variant_new_int32(ARRAY_SIZE(vdivs));
 343                 break;
 344         }
 345
 346         if (!sdi)
 347                 return SR_ERR_ARG;
 348
 349         devc = sdi->priv;
 350         if (!cg) {
 351                 switch (key) {
 352                 case SR_CONF_SAMPLERATE:
 353                         *data = g_variant_new_uint64(devc->samplerate);
 354                         break;
 355                 case SR_CONF_LIMIT_MSEC:
 356                         *data = g_variant_new_uint64(devc->limit_msec);
 357                         break;
 358                 case SR_CONF_LIMIT_SAMPLES:
 359                         *data = g_variant_new_uint64(devc->limit_samples);
 360                         break;
 361                 case SR_CONF_CONN:
 362                         if (!sdi->conn)
 363                                 return SR_ERR_ARG;
 364                         usb = sdi->conn;
 365                         if (usb->address == 255)
 366                                 /* Device still needs to re-enumerate after firmware
 367                                  * upload, so we don't know its (future) address. */
 368                                 return SR_ERR;
 369                         snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 370                         *data = g_variant_new_string(str);
 371                         break;
 372                 default:
 373                         return SR_ERR_NA;
 374                 }
 375         } else {
 376                 if (sdi->channel_groups->data == cg)
 377                         ch_idx = 0;
 378                 else if (sdi->channel_groups->next->data == cg)
 379                         ch_idx = 1;
 380                 else
 381                         return SR_ERR_ARG;
 382                 switch (key) {
 383                 case SR_CONF_VDIV:
 384                         vdiv = vdivs[devc->voltage[ch_idx]];
 385                         *data = g_variant_new("(tt)", vdiv[0], vdiv[1]);
 386                         break;
 387                 case SR_CONF_COUPLING:
 388                         *data = g_variant_new_string(devc->coupling_vals[devc->coupling[ch_idx]]);
 389                         break;
 390                 }
 391         }
 392
 393         return SR_OK;
 394 }
 395
 396 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 397                 const struct sr_channel_group *cg)
 398 {
 399         struct dev_context *devc;
 400         uint64_t p, q;
 401         int tmp_int, ch_idx, ret;
 402         unsigned int i;
 403         const char *tmp_str;
 404
 405         if (sdi->status != SR_ST_ACTIVE)
 406                 return SR_ERR_DEV_CLOSED;
 407
 408         ret = SR_OK;
 409         devc = sdi->priv;
 410         if (!cg) {
 411                 switch (key) {
 412                 case SR_CONF_SAMPLERATE:
 413                         devc->samplerate = g_variant_get_uint64(data);
 414                         hantek_6xxx_update_samplerate(sdi);
 415                         break;
 416                 case SR_CONF_LIMIT_MSEC:
 417                         devc->limit_msec = g_variant_get_uint64(data);
 418                         break;
 419                 case SR_CONF_LIMIT_SAMPLES:
 420                         devc->limit_samples = g_variant_get_uint64(data);
 421                         break;
 422                 default:
 423                         ret = SR_ERR_NA;
 424                         break;
 425                 }
 426         } else {
 427                 if (sdi->channel_groups->data == cg)
 428                         ch_idx = 0;
 429                 else if (sdi->channel_groups->next->data == cg)
 430                         ch_idx = 1;
 431                 else
 432                         return SR_ERR_ARG;
 433                 switch (key) {
 434                 case SR_CONF_VDIV:
 435                         g_variant_get(data, "(tt)", &p, &q);
 436                         tmp_int = -1;
 437                         for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 438                                 if (vdivs[i][0] == p && vdivs[i][1] == q) {
 439                                         tmp_int = i;
 440                                         break;
 441                                 }
 442                         }
 443                         if (tmp_int >= 0) {
 444                                 devc->voltage[ch_idx] = tmp_int;
 445                                 hantek_6xxx_update_vdiv(sdi);
 446                         } else
 447                                 ret = SR_ERR_ARG;
 448                         break;
 449                 case SR_CONF_COUPLING:
 450                         tmp_str = g_variant_get_string(data, NULL);
 451                         for (i = 0; i < devc->coupling_tab_size; i++) {
 452                                 if (!strcmp(tmp_str, devc->coupling_vals[i])) {
 453                                         devc->coupling[ch_idx] = i;
 454                                         break;
 455                                 }
 456                         }
 457                         if (i == devc->coupling_tab_size)
 458                                 ret = SR_ERR_ARG;
 459                         break;
 460                 default:
 461                         ret = SR_ERR_NA;
 462                         break;
 463                 }
 464         }
 465
 466         return ret;
 467 }
 468
 469 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 470                 const struct sr_channel_group *cg)
 471 {
 472         GVariant *tuple, *rational[2];
 473         GVariantBuilder gvb;
 474         unsigned int i;
 475         GVariant *gvar;
 476         struct dev_context *devc = NULL;
 477
 478         if (key == SR_CONF_SCAN_OPTIONS) {
 479                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 480                         scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 481                 return SR_OK;
 482         } else if (key == SR_CONF_DEVICE_OPTIONS && !sdi) {
 483                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 484                         drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
 485                 return SR_OK;
 486         }
 487
 488         if (sdi)
 489                 devc = sdi->priv;
 490
 491         if (!cg) {
 492                 switch (key) {
 493                 case SR_CONF_DEVICE_OPTIONS:
 494                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 495                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 496                         break;
 497                 case SR_CONF_SAMPLERATE:
 498                         g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 499                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 500                                 samplerates, ARRAY_SIZE(samplerates),
 501                                 sizeof(uint64_t));
 502                         g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 503                         *data = g_variant_builder_end(&gvb);
 504                         break;
 505                 default:
 506                         return SR_ERR_NA;
 507                 }
 508         } else {
 509                 switch (key) {
 510                 case SR_CONF_DEVICE_OPTIONS:
 511                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 512                                 devopts_cg, ARRAY_SIZE(devopts_cg), sizeof(uint32_t));
 513                         break;
 514                 case SR_CONF_COUPLING:
 515                         if (!devc)
 516                                 return SR_ERR_NA;
 517                         *data = g_variant_new_strv(devc->coupling_vals, devc->coupling_tab_size);
 518                         break;
 519                 case SR_CONF_VDIV:
 520                         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 521                         for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 522                                 rational[0] = g_variant_new_uint64(vdivs[i][0]);
 523                                 rational[1] = g_variant_new_uint64(vdivs[i][1]);
 524                                 tuple = g_variant_new_tuple(rational, 2);
 525                                 g_variant_builder_add_value(&gvb, tuple);
 526                         }
 527                         *data = g_variant_builder_end(&gvb);
 528                         break;
 529                 default:
 530                         return SR_ERR_NA;
 531                 }
 532         }
 533
 534         return SR_OK;
 535 }
 536
 537 /* Minimise data amount for limit_samples and limit_msec limits. */
 538 static uint32_t data_amount(const struct sr_dev_inst *sdi)
 539 {
 540         struct dev_context *devc = sdi->priv;
 541         uint32_t data_left, data_left_2, i;
 542         int32_t time_left;
 543
 544         if (devc->limit_msec) {
 545                 time_left = devc->limit_msec - (g_get_monotonic_time() - devc->aq_started) / 1000;
 546                 data_left = devc->samplerate * MAX(time_left, 0) * NUM_CHANNELS / 1000;
 547         } else if (devc->limit_samples) {
 548                 data_left = (devc->limit_samples - devc->samp_received) * NUM_CHANNELS;
 549         } else {
 550                 data_left = devc->samplerate * NUM_CHANNELS;
 551         }
 552
 553         /* Round up to nearest power of two. */
 554         for (i = MIN_PACKET_SIZE; i < data_left; i *= 2)
 555                 ;
 556         data_left_2 = i;
 557
 558         sr_spew("data_amount: %u (rounded to power of 2: %u)", data_left, data_left_2);
 559
 560         return data_left_2;
 561 }
 562
 563 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 564                 int num_samples)
 565 {
 566         struct sr_datafeed_packet packet;
 567         struct sr_datafeed_analog analog;
 568         struct sr_analog_encoding encoding;
 569         struct sr_analog_meaning meaning;
 570         struct sr_analog_spec spec;
 571         struct dev_context *devc = sdi->priv;
 572         GSList *channels = devc->enabled_channels;
 573
 574         const float ch_bit[] = { RANGE(0) / 255, RANGE(1) / 255 };
 575         const float ch_center[] = { RANGE(0) / 2, RANGE(1) / 2 };
 576
 577         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
 578
 579         packet.type = SR_DF_ANALOG;
 580         packet.payload = &analog;
 581
 582         analog.num_samples = num_samples;
 583         analog.meaning->mq = SR_MQ_VOLTAGE;
 584         analog.meaning->unit = SR_UNIT_VOLT;
 585         analog.meaning->mqflags = 0;
 586
 587         analog.data = g_try_malloc(num_samples * sizeof(float));
 588         if (!analog.data) {
 589                 sr_err("Analog data buffer malloc failed.");
 590                 devc->dev_state = STOPPING;
 591                 return;
 592         }
 593
 594         for (int ch = 0; ch < 2; ch++) {
 595                 if (!devc->ch_enabled[ch])
 596                         continue;
 597
 598                 float vdivlog = log10f(ch_bit[ch]);
 599                 int digits = -(int)vdivlog + (vdivlog < 0.0);
 600                 analog.encoding->digits = digits;
 601                 analog.spec->spec_digits = digits;
 602                 analog.meaning->channels = g_slist_append(NULL, channels->data);
 603
 604                 for (int i = 0; i < num_samples; i++) {
 605                         /*
 606                          * The device always sends data for both channels. If a channel
 607                          * is disabled, it contains a copy of the enabled channel's
 608                          * data. However, we only send the requested channels to
 609                          * the bus.
 610                          *
 611                          * Voltage values are encoded as a value 0-255, where the
 612                          * value is a point in the range represented by the vdiv
 613                          * setting. There are 10 vertical divs, so e.g. 500mV/div
 614                          * represents 5V peak-to-peak where 0 = -2.5V and 255 = +2.5V.
 615                          */
 616                         ((float *)analog.data)[i] = ch_bit[ch] * *(buf + i * 2 + ch) - ch_center[ch];
 617                 }
 618
 619                 sr_session_send(sdi, &packet);
 620                 g_slist_free(analog.meaning->channels);
 621
 622                 channels = channels->next;
 623         }
 624         g_free(analog.data);
 625 }
 626
 627 static void send_data(struct sr_dev_inst *sdi, struct libusb_transfer *buf[], uint64_t samples)
 628 {
 629         int i = 0;
 630         uint64_t send = 0;
 631         uint32_t chunk;
 632
 633         while (send < samples) {
 634                 chunk = MIN(samples - send, (uint64_t)(buf[i]->actual_length / NUM_CHANNELS));
 635                 send += chunk;
 636                 send_chunk(sdi, buf[i]->buffer, chunk);
 637
 638                 /*
 639                  * Everything in this transfer was either copied to the buffer
 640                  * or sent to the session bus.
 641                  */
 642                 g_free(buf[i]->buffer);
 643                 libusb_free_transfer(buf[i]);
 644                 i++;
 645         }
 646 }
 647
 648 /*
 649  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 650  * Only channel data comes in asynchronously, and all transfers for this are
 651  * queued up beforehand, so this just needs to chuck the incoming data onto
 652  * the libsigrok session bus.
 653  */
 654 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 655 {
 656         struct sr_dev_inst *sdi;
 657         struct dev_context *devc;
 658
 659         sdi = transfer->user_data;
 660         devc = sdi->priv;
 661
 662         if (devc->dev_state == FLUSH) {
 663                 g_free(transfer->buffer);
 664                 libusb_free_transfer(transfer);
 665                 devc->dev_state = CAPTURE;
 666                 devc->aq_started = g_get_monotonic_time();
 667                 read_channel(sdi, data_amount(sdi));
 668                 return;
 669         }
 670
 671         if (devc->dev_state != CAPTURE)
 672                 return;
 673
 674         if (!devc->sample_buf) {
 675                 devc->sample_buf_size = 10;
 676                 devc->sample_buf = g_try_malloc(devc->sample_buf_size * sizeof(transfer));
 677                 devc->sample_buf_write = 0;
 678         }
 679
 680         if (devc->sample_buf_write >= devc->sample_buf_size) {
 681                 devc->sample_buf_size += 10;
 682                 devc->sample_buf = g_try_realloc(devc->sample_buf,
 683                                 devc->sample_buf_size * sizeof(transfer));
 684                 if (!devc->sample_buf) {
 685                         sr_err("Sample buffer malloc failed.");
 686                         devc->dev_state = STOPPING;
 687                         return;
 688                 }
 689         }
 690
 691         devc->sample_buf[devc->sample_buf_write++] = transfer;
 692         devc->samp_received += transfer->actual_length / NUM_CHANNELS;
 693
 694         sr_spew("receive_transfer(): calculated samplerate == %" PRIu64 "ks/s",
 695                 (uint64_t)(transfer->actual_length * 1000 /
 696                 (g_get_monotonic_time() - devc->read_start_ts + 1) /
 697                 NUM_CHANNELS));
 698
 699         sr_spew("receive_transfer(): status %s received %d bytes.",
 700                 libusb_error_name(transfer->status), transfer->actual_length);
 701
 702         if (transfer->actual_length == 0)
 703                 /* Nothing to send to the bus. */
 704                 return;
 705
 706         if (devc->limit_samples && devc->samp_received >= devc->limit_samples) {
 707                 sr_info("Requested number of samples reached, stopping. %"
 708                         PRIu64 " <= %" PRIu64, devc->limit_samples,
 709                         devc->samp_received);
 710                 send_data(sdi, devc->sample_buf, devc->limit_samples);
 711                 sdi->driver->dev_acquisition_stop(sdi);
 712         } else if (devc->limit_msec && (g_get_monotonic_time() -
 713                         devc->aq_started) / 1000 >= devc->limit_msec) {
 714                 sr_info("Requested time limit reached, stopping. %d <= %d",
 715                         (uint32_t)devc->limit_msec,
 716                         (uint32_t)(g_get_monotonic_time() - devc->aq_started) / 1000);
 717                 send_data(sdi, devc->sample_buf, devc->samp_received);
 718                 g_free(devc->sample_buf);
 719                 devc->sample_buf = NULL;
 720                 sdi->driver->dev_acquisition_stop(sdi);
 721         } else {
 722                 read_channel(sdi, data_amount(sdi));
 723         }
 724 }
 725
 726 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount)
 727 {
 728         int ret;
 729         struct dev_context *devc;
 730
 731         devc = sdi->priv;
 732
 733         amount = MIN(amount, MAX_PACKET_SIZE);
 734         ret = hantek_6xxx_get_channeldata(sdi, receive_transfer, amount);
 735         devc->read_start_ts = g_get_monotonic_time();
 736         devc->read_data_amount = amount;
 737
 738         return ret;
 739 }
 740
 741 static int handle_event(int fd, int revents, void *cb_data)
 742 {
 743         const struct sr_dev_inst *sdi;
 744         struct timeval tv;
 745         struct sr_dev_driver *di;
 746         struct dev_context *devc;
 747         struct drv_context *drvc;
 748
 749         (void)fd;
 750         (void)revents;
 751
 752         sdi = cb_data;
 753         di = sdi->driver;
 754         drvc = di->context;
 755         devc = sdi->priv;
 756
 757         /* Always handle pending libusb events. */
 758         tv.tv_sec = tv.tv_usec = 0;
 759         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 760
 761         if (devc->dev_state == STOPPING) {
 762                 /* We've been told to wind up the acquisition. */
 763                 sr_dbg("Stopping acquisition.");
 764
 765                 hantek_6xxx_stop_data_collecting(sdi);
 766                 /*
 767                  * TODO: Doesn't really cancel pending transfers so they might
 768                  * come in after SR_DF_END is sent.
 769                  */
 770                 usb_source_remove(sdi->session, drvc->sr_ctx);
 771
 772                 std_session_send_df_end(sdi);
 773
 774                 devc->dev_state = IDLE;
 775
 776                 return TRUE;
 777         }
 778
 779         return TRUE;
 780 }
 781
 782 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 783 {
 784         struct dev_context *devc;
 785         struct sr_dev_driver *di = sdi->driver;
 786         struct drv_context *drvc = di->context;
 787
 788         if (sdi->status != SR_ST_ACTIVE)
 789                 return SR_ERR_DEV_CLOSED;
 790
 791         devc = sdi->priv;
 792
 793         if (configure_channels(sdi) != SR_OK) {
 794                 sr_err("Failed to configure channels.");
 795                 return SR_ERR;
 796         }
 797
 798         if (hantek_6xxx_init(sdi) != SR_OK)
 799                 return SR_ERR;
 800
 801         std_session_send_df_header(sdi);
 802
 803         devc->samp_received = 0;
 804         devc->dev_state = FLUSH;
 805
 806         usb_source_add(sdi->session, drvc->sr_ctx, TICK,
 807                        handle_event, (void *)sdi);
 808
 809         hantek_6xxx_start_data_collecting(sdi);
 810
 811         read_channel(sdi, FLUSH_PACKET_SIZE);
 812
 813         return SR_OK;
 814 }
 815
 816 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 817 {
 818         struct dev_context *devc;
 819
 820         if (sdi->status != SR_ST_ACTIVE)
 821                 return SR_ERR;
 822
 823         devc = sdi->priv;
 824         devc->dev_state = STOPPING;
 825
 826         g_free(devc->sample_buf); devc->sample_buf = NULL;
 827
 828         return SR_OK;
 829 }
 830
 831 static struct sr_dev_driver hantek_6xxx_driver_info = {
 832         .name = "hantek-6xxx",
 833         .longname = "Hantek 6xxx",
 834         .api_version = 1,
 835         .init = std_init,
 836         .cleanup = std_cleanup,
 837         .scan = scan,
 838         .dev_list = std_dev_list,
 839         .dev_clear = dev_clear,
 840         .config_get = config_get,
 841         .config_set = config_set,
 842         .config_list = config_list,
 843         .dev_open = dev_open,
 844         .dev_close = dev_close,
 845         .dev_acquisition_start = dev_acquisition_start,
 846         .dev_acquisition_stop = dev_acquisition_stop,
 847         .context = NULL,
 848 };
 849 SR_REGISTER_DEV_DRIVER(hantek_6xxx_driver_info);