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_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  40         SR_CONF_NUM_VDIV | SR_CONF_GET,
  41         SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
  42         SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET,
  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         ALL_ZERO
  74 };
  75
  76 static const uint64_t samplerates[] = {
  77         SAMPLERATE_VALUES
  78 };
  79
  80 static const uint64_t vdivs[][2] = {
  81         VDIV_VALUES
  82 };
  83
  84 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount);
  85
  86 static int dev_acquisition_stop(struct sr_dev_inst *sdi);
  87
  88 static struct sr_dev_inst *hantek_6xxx_dev_new(const struct hantek_6xxx_profile *prof)
  89 {
  90         struct sr_dev_inst *sdi;
  91         struct sr_channel *ch;
  92         struct sr_channel_group *cg;
  93         struct dev_context *devc;
  94         unsigned int i;
  95
  96         sdi = g_malloc0(sizeof(struct sr_dev_inst));
  97         sdi->status = SR_ST_INITIALIZING;
  98         sdi->vendor = g_strdup(prof->vendor);
  99         sdi->model = g_strdup(prof->model);
 100
 101         for (i = 0; i < ARRAY_SIZE(channel_names); i++) {
 102                 ch = sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE, channel_names[i]);
 103                 cg = g_malloc0(sizeof(struct sr_channel_group));
 104                 cg->name = g_strdup(channel_names[i]);
 105                 cg->channels = g_slist_append(cg->channels, ch);
 106                 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 107         }
 108
 109         devc = g_malloc0(sizeof(struct dev_context));
 110
 111         for (i = 0; i < NUM_CHANNELS; i++) {
 112                 devc->ch_enabled[i] = TRUE;
 113                 devc->voltage[i] = DEFAULT_VOLTAGE;
 114                 devc->coupling[i] = DEFAULT_COUPLING;
 115         }
 116         devc->coupling_vals = prof->coupling_vals;
 117         devc->coupling_tab_size = prof->coupling_tab_size;
 118
 119         devc->sample_buf = NULL;
 120         devc->sample_buf_write = 0;
 121         devc->sample_buf_size = 0;
 122
 123         devc->profile = prof;
 124         devc->dev_state = IDLE;
 125         devc->samplerate = DEFAULT_SAMPLERATE;
 126
 127         sdi->priv = devc;
 128
 129         return sdi;
 130 }
 131
 132 static int configure_channels(const struct sr_dev_inst *sdi)
 133 {
 134         struct dev_context *devc;
 135         const GSList *l;
 136         int p;
 137         struct sr_channel *ch;
 138         devc = sdi->priv;
 139
 140         g_slist_free(devc->enabled_channels);
 141         devc->enabled_channels = NULL;
 142         memset(devc->ch_enabled, 0, sizeof(devc->ch_enabled));
 143
 144         for (l = sdi->channels, p = 0; l; l = l->next, p++) {
 145                 ch = l->data;
 146                 if (p < NUM_CHANNELS) {
 147                         devc->ch_enabled[p] = ch->enabled;
 148                         devc->enabled_channels = g_slist_append(devc->enabled_channels, ch);
 149                 }
 150         }
 151
 152         return SR_OK;
 153 }
 154
 155 static void clear_dev_context(void *priv)
 156 {
 157         struct dev_context *devc;
 158
 159         devc = priv;
 160         g_slist_free(devc->enabled_channels);
 161         g_free(devc);
 162 }
 163
 164 static int dev_clear(const struct sr_dev_driver *di)
 165 {
 166         return std_dev_clear(di, clear_dev_context);
 167 }
 168
 169 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 170 {
 171         struct drv_context *drvc;
 172         struct dev_context *devc;
 173         struct sr_dev_inst *sdi;
 174         struct sr_usb_dev_inst *usb;
 175         struct sr_config *src;
 176         const struct hantek_6xxx_profile *prof;
 177         GSList *l, *devices, *conn_devices;
 178         struct libusb_device_descriptor des;
 179         libusb_device **devlist;
 180         int i, j;
 181         const char *conn;
 182         char connection_id[64];
 183
 184         drvc = di->context;
 185
 186         devices = 0;
 187
 188         conn = NULL;
 189         for (l = options; l; l = l->next) {
 190                 src = l->data;
 191                 if (src->key == SR_CONF_CONN) {
 192                         conn = g_variant_get_string(src->data, NULL);
 193                         break;
 194                 }
 195         }
 196         if (conn)
 197                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 198         else
 199                 conn_devices = NULL;
 200
 201         /* Find all Hantek 60xx devices and upload firmware to all of them. */
 202         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 203         for (i = 0; devlist[i]; i++) {
 204                 if (conn) {
 205                         usb = NULL;
 206                         for (l = conn_devices; l; l = l->next) {
 207                                 usb = l->data;
 208                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 209                                         && usb->address == libusb_get_device_address(devlist[i]))
 210                                         break;
 211                         }
 212                         if (!l)
 213                                 /* This device matched none of the ones that
 214                                  * matched the conn specification. */
 215                                 continue;
 216                 }
 217
 218                 libusb_get_device_descriptor(devlist[i], &des);
 219
 220                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 221
 222                 prof = NULL;
 223                 for (j = 0; dev_profiles[j].orig_vid; j++) {
 224                         if (des.idVendor == dev_profiles[j].orig_vid
 225                                 && des.idProduct == dev_profiles[j].orig_pid) {
 226                                 /* Device matches the pre-firmware profile. */
 227                                 prof = &dev_profiles[j];
 228                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 229                                 sdi = hantek_6xxx_dev_new(prof);
 230                                 sdi->connection_id = g_strdup(connection_id);
 231                                 devices = g_slist_append(devices, sdi);
 232                                 devc = sdi->priv;
 233                                 if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 234                                                 USB_CONFIGURATION, prof->firmware) == SR_OK)
 235                                         /* Remember when the firmware on this device was updated. */
 236                                         devc->fw_updated = g_get_monotonic_time();
 237                                 else
 238                                         sr_err("Firmware upload failed.");
 239                                 /* Dummy USB address of 0xff will get overwritten later. */
 240                                 sdi->conn = sr_usb_dev_inst_new(
 241                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 242                                 break;
 243                         } else if (des.idVendor == dev_profiles[j].fw_vid
 244                                 && des.idProduct == dev_profiles[j].fw_pid
 245                                 && des.bcdDevice == dev_profiles[j].fw_prod_ver) {
 246                                 /* Device matches the post-firmware profile. */
 247                                 prof = &dev_profiles[j];
 248                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 249                                 sdi = hantek_6xxx_dev_new(prof);
 250                                 sdi->connection_id = g_strdup(connection_id);
 251                                 sdi->status = SR_ST_INACTIVE;
 252                                 devices = g_slist_append(devices, sdi);
 253                                 sdi->inst_type = SR_INST_USB;
 254                                 sdi->conn = sr_usb_dev_inst_new(
 255                                                 libusb_get_bus_number(devlist[i]),
 256                                                 libusb_get_device_address(devlist[i]), NULL);
 257                                 break;
 258                         }
 259                 }
 260                 if (!prof)
 261                         /* Not a supported VID/PID. */
 262                         continue;
 263         }
 264         libusb_free_device_list(devlist, 1);
 265
 266         return std_scan_complete(di, devices);
 267 }
 268
 269 static int dev_open(struct sr_dev_inst *sdi)
 270 {
 271         struct dev_context *devc;
 272         struct sr_usb_dev_inst *usb;
 273         int64_t timediff_us, timediff_ms;
 274         int err;
 275
 276         devc = sdi->priv;
 277         usb = sdi->conn;
 278
 279         /*
 280          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 281          * for the FX2 to renumerate.
 282          */
 283         err = SR_ERR;
 284         if (devc->fw_updated > 0) {
 285                 sr_info("Waiting for device to reset.");
 286                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 287                 g_usleep(300 * 1000);
 288                 timediff_ms = 0;
 289                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 290                         if ((err = hantek_6xxx_open(sdi)) == SR_OK)
 291                                 break;
 292                         g_usleep(100 * 1000);
 293                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 294                         timediff_ms = timediff_us / 1000;
 295                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 296                 }
 297                 if (timediff_ms < MAX_RENUM_DELAY_MS)
 298                         sr_info("Device came back after %"PRIu64" ms.", timediff_ms);
 299         } else {
 300                 err = hantek_6xxx_open(sdi);
 301         }
 302
 303         if (err != SR_OK) {
 304                 sr_err("Unable to open device.");
 305                 return SR_ERR;
 306         }
 307
 308         err = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 309         if (err != 0) {
 310                 sr_err("Unable to claim interface: %s.",
 311                         libusb_error_name(err));
 312                 return SR_ERR;
 313         }
 314
 315         return SR_OK;
 316 }
 317
 318 static int dev_close(struct sr_dev_inst *sdi)
 319 {
 320         hantek_6xxx_close(sdi);
 321
 322         return SR_OK;
 323 }
 324
 325 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 326                 const struct sr_channel_group *cg)
 327 {
 328         struct dev_context *devc;
 329         struct sr_usb_dev_inst *usb;
 330         char str[128];
 331         const uint64_t *vdiv;
 332         int ch_idx;
 333
 334         switch (key) {
 335         case SR_CONF_NUM_VDIV:
 336                 *data = g_variant_new_int32(ARRAY_SIZE(vdivs));
 337                 break;
 338         }
 339
 340         if (!sdi)
 341                 return SR_ERR_ARG;
 342
 343         devc = sdi->priv;
 344         if (!cg) {
 345                 switch (key) {
 346                 case SR_CONF_SAMPLERATE:
 347                         *data = g_variant_new_uint64(devc->samplerate);
 348                         break;
 349                 case SR_CONF_LIMIT_MSEC:
 350                         *data = g_variant_new_uint64(devc->limit_msec);
 351                         break;
 352                 case SR_CONF_LIMIT_SAMPLES:
 353                         *data = g_variant_new_uint64(devc->limit_samples);
 354                         break;
 355                 case SR_CONF_CONN:
 356                         if (!sdi->conn)
 357                                 return SR_ERR_ARG;
 358                         usb = sdi->conn;
 359                         if (usb->address == 255)
 360                                 /* Device still needs to re-enumerate after firmware
 361                                  * upload, so we don't know its (future) address. */
 362                                 return SR_ERR;
 363                         snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 364                         *data = g_variant_new_string(str);
 365                         break;
 366                 default:
 367                         return SR_ERR_NA;
 368                 }
 369         } else {
 370                 if (sdi->channel_groups->data == cg)
 371                         ch_idx = 0;
 372                 else if (sdi->channel_groups->next->data == cg)
 373                         ch_idx = 1;
 374                 else
 375                         return SR_ERR_ARG;
 376                 switch (key) {
 377                 case SR_CONF_VDIV:
 378                         vdiv = vdivs[devc->voltage[ch_idx]];
 379                         *data = g_variant_new("(tt)", vdiv[0], vdiv[1]);
 380                         break;
 381                 case SR_CONF_COUPLING:
 382                         *data = g_variant_new_string(devc->coupling_vals[devc->coupling[ch_idx]]);
 383                         break;
 384                 }
 385         }
 386
 387         return SR_OK;
 388 }
 389
 390 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 391                 const struct sr_channel_group *cg)
 392 {
 393         struct dev_context *devc;
 394         uint64_t p, q;
 395         int tmp_int, ch_idx, ret;
 396         unsigned int i;
 397         const char *tmp_str;
 398
 399         if (sdi->status != SR_ST_ACTIVE)
 400                 return SR_ERR_DEV_CLOSED;
 401
 402         ret = SR_OK;
 403         devc = sdi->priv;
 404         if (!cg) {
 405                 switch (key) {
 406                 case SR_CONF_SAMPLERATE:
 407                         devc->samplerate = g_variant_get_uint64(data);
 408                         hantek_6xxx_update_samplerate(sdi);
 409                         break;
 410                 case SR_CONF_LIMIT_MSEC:
 411                         devc->limit_msec = g_variant_get_uint64(data);
 412                         break;
 413                 case SR_CONF_LIMIT_SAMPLES:
 414                         devc->limit_samples = g_variant_get_uint64(data);
 415                         break;
 416                 default:
 417                         ret = SR_ERR_NA;
 418                         break;
 419                 }
 420         } else {
 421                 if (sdi->channel_groups->data == cg)
 422                         ch_idx = 0;
 423                 else if (sdi->channel_groups->next->data == cg)
 424                         ch_idx = 1;
 425                 else
 426                         return SR_ERR_ARG;
 427                 switch (key) {
 428                 case SR_CONF_VDIV:
 429                         g_variant_get(data, "(tt)", &p, &q);
 430                         tmp_int = -1;
 431                         for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 432                                 if (vdivs[i][0] == p && vdivs[i][1] == q) {
 433                                         tmp_int = i;
 434                                         break;
 435                                 }
 436                         }
 437                         if (tmp_int >= 0) {
 438                                 devc->voltage[ch_idx] = tmp_int;
 439                                 hantek_6xxx_update_vdiv(sdi);
 440                         } else
 441                                 ret = SR_ERR_ARG;
 442                         break;
 443                 case SR_CONF_COUPLING:
 444                         tmp_str = g_variant_get_string(data, NULL);
 445                         for (i = 0; i < devc->coupling_tab_size; i++) {
 446                                 if (!strcmp(tmp_str, devc->coupling_vals[i])) {
 447                                         devc->coupling[ch_idx] = i;
 448                                         break;
 449                                 }
 450                         }
 451                         if (i == devc->coupling_tab_size)
 452                                 ret = SR_ERR_ARG;
 453                         break;
 454                 default:
 455                         ret = SR_ERR_NA;
 456                         break;
 457                 }
 458         }
 459
 460         return ret;
 461 }
 462
 463 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 464                 const struct sr_channel_group *cg)
 465 {
 466         GVariant *tuple, *rational[2];
 467         GVariantBuilder gvb;
 468         unsigned int i;
 469         GVariant *gvar;
 470         struct dev_context *devc = NULL;
 471
 472         if (key == SR_CONF_SCAN_OPTIONS) {
 473                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 474                         scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 475                 return SR_OK;
 476         } else if (key == SR_CONF_DEVICE_OPTIONS && !sdi) {
 477                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 478                         drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
 479                 return SR_OK;
 480         }
 481
 482         if (sdi)
 483                 devc = sdi->priv;
 484
 485         if (!cg) {
 486                 switch (key) {
 487                 case SR_CONF_DEVICE_OPTIONS:
 488                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 489                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 490                         break;
 491                 case SR_CONF_SAMPLERATE:
 492                         g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 493                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 494                                 samplerates, ARRAY_SIZE(samplerates),
 495                                 sizeof(uint64_t));
 496                         g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 497                         *data = g_variant_builder_end(&gvb);
 498                         break;
 499                 default:
 500                         return SR_ERR_NA;
 501                 }
 502         } else {
 503                 switch (key) {
 504                 case SR_CONF_DEVICE_OPTIONS:
 505                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 506                                 devopts_cg, ARRAY_SIZE(devopts_cg), sizeof(uint32_t));
 507                         break;
 508                 case SR_CONF_COUPLING:
 509                         if (!devc)
 510                                 return SR_ERR_NA;
 511                         *data = g_variant_new_strv(devc->coupling_vals, devc->coupling_tab_size);
 512                         break;
 513                 case SR_CONF_VDIV:
 514                         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 515                         for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 516                                 rational[0] = g_variant_new_uint64(vdivs[i][0]);
 517                                 rational[1] = g_variant_new_uint64(vdivs[i][1]);
 518                                 tuple = g_variant_new_tuple(rational, 2);
 519                                 g_variant_builder_add_value(&gvb, tuple);
 520                         }
 521                         *data = g_variant_builder_end(&gvb);
 522                         break;
 523                 default:
 524                         return SR_ERR_NA;
 525                 }
 526         }
 527
 528         return SR_OK;
 529 }
 530
 531 /* Minimise data amount for limit_samples and limit_msec limits. */
 532 static uint32_t data_amount(const struct sr_dev_inst *sdi)
 533 {
 534         struct dev_context *devc = sdi->priv;
 535         uint32_t data_left, data_left_2, i;
 536         int32_t time_left;
 537
 538         if (devc->limit_msec) {
 539                 time_left = devc->limit_msec - (g_get_monotonic_time() - devc->aq_started) / 1000;
 540                 data_left = devc->samplerate * MAX(time_left, 0) * NUM_CHANNELS / 1000;
 541         } else if (devc->limit_samples) {
 542                 data_left = (devc->limit_samples - devc->samp_received) * NUM_CHANNELS;
 543         } else {
 544                 data_left = devc->samplerate * NUM_CHANNELS;
 545         }
 546
 547         /* Round up to nearest power of two. */
 548         for (i = MIN_PACKET_SIZE; i < data_left; i *= 2)
 549                 ;
 550         data_left_2 = i;
 551
 552         sr_spew("data_amount: %u (rounded to power of 2: %u)", data_left, data_left_2);
 553
 554         return data_left_2;
 555 }
 556
 557 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 558                 int num_samples)
 559 {
 560         struct sr_datafeed_packet packet;
 561         struct sr_datafeed_analog analog;
 562         struct sr_analog_encoding encoding;
 563         struct sr_analog_meaning meaning;
 564         struct sr_analog_spec spec;
 565         struct dev_context *devc = sdi->priv;
 566         GSList *channels = devc->enabled_channels;
 567
 568         const float ch_bit[] = { RANGE(0) / 255, RANGE(1) / 255 };
 569         const float ch_center[] = { RANGE(0) / 2, RANGE(1) / 2 };
 570
 571         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
 572
 573         packet.type = SR_DF_ANALOG;
 574         packet.payload = &analog;
 575
 576         analog.num_samples = num_samples;
 577         analog.meaning->mq = SR_MQ_VOLTAGE;
 578         analog.meaning->unit = SR_UNIT_VOLT;
 579         analog.meaning->mqflags = 0;
 580
 581         analog.data = g_try_malloc(num_samples * sizeof(float));
 582         if (!analog.data) {
 583                 sr_err("Analog data buffer malloc failed.");
 584                 devc->dev_state = STOPPING;
 585                 return;
 586         }
 587
 588         for (int ch = 0; ch < 2; ch++) {
 589                 if (!devc->ch_enabled[ch])
 590                         continue;
 591
 592                 float vdivlog = log10f(ch_bit[ch]);
 593                 int digits = -(int)vdivlog + (vdivlog < 0.0);
 594                 analog.encoding->digits = digits;
 595                 analog.spec->spec_digits = digits;
 596                 analog.meaning->channels = g_slist_append(NULL, channels->data);
 597
 598                 for (int i = 0; i < num_samples; i++) {
 599                         /*
 600                          * The device always sends data for both channels. If a channel
 601                          * is disabled, it contains a copy of the enabled channel's
 602                          * data. However, we only send the requested channels to
 603                          * the bus.
 604                          *
 605                          * Voltage values are encoded as a value 0-255, where the
 606                          * value is a point in the range represented by the vdiv
 607                          * setting. There are 10 vertical divs, so e.g. 500mV/div
 608                          * represents 5V peak-to-peak where 0 = -2.5V and 255 = +2.5V.
 609                          */
 610                         ((float *)analog.data)[i] = ch_bit[ch] * *(buf + i * 2 + ch) - ch_center[ch];
 611                 }
 612
 613                 sr_session_send(sdi, &packet);
 614                 g_slist_free(analog.meaning->channels);
 615
 616                 channels = channels->next;
 617         }
 618         g_free(analog.data);
 619 }
 620
 621 static void send_data(struct sr_dev_inst *sdi, struct libusb_transfer *buf[], uint64_t samples)
 622 {
 623         int i = 0;
 624         uint64_t send = 0;
 625         uint32_t chunk;
 626
 627         while (send < samples) {
 628                 chunk = MIN(samples - send, (uint64_t)(buf[i]->actual_length / NUM_CHANNELS));
 629                 send += chunk;
 630                 send_chunk(sdi, buf[i]->buffer, chunk);
 631
 632                 /*
 633                  * Everything in this transfer was either copied to the buffer
 634                  * or sent to the session bus.
 635                  */
 636                 g_free(buf[i]->buffer);
 637                 libusb_free_transfer(buf[i]);
 638                 i++;
 639         }
 640 }
 641
 642 /*
 643  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 644  * Only channel data comes in asynchronously, and all transfers for this are
 645  * queued up beforehand, so this just needs to chuck the incoming data onto
 646  * the libsigrok session bus.
 647  */
 648 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 649 {
 650         struct sr_dev_inst *sdi;
 651         struct dev_context *devc;
 652
 653         sdi = transfer->user_data;
 654         devc = sdi->priv;
 655
 656         if (devc->dev_state == FLUSH) {
 657                 g_free(transfer->buffer);
 658                 libusb_free_transfer(transfer);
 659                 devc->dev_state = CAPTURE;
 660                 devc->aq_started = g_get_monotonic_time();
 661                 read_channel(sdi, data_amount(sdi));
 662                 return;
 663         }
 664
 665         if (devc->dev_state != CAPTURE)
 666                 return;
 667
 668         if (!devc->sample_buf) {
 669                 devc->sample_buf_size = 10;
 670                 devc->sample_buf = g_try_malloc(devc->sample_buf_size * sizeof(transfer));
 671                 devc->sample_buf_write = 0;
 672         }
 673
 674         if (devc->sample_buf_write >= devc->sample_buf_size) {
 675                 devc->sample_buf_size += 10;
 676                 devc->sample_buf = g_try_realloc(devc->sample_buf,
 677                                 devc->sample_buf_size * sizeof(transfer));
 678                 if (!devc->sample_buf) {
 679                         sr_err("Sample buffer malloc failed.");
 680                         devc->dev_state = STOPPING;
 681                         return;
 682                 }
 683         }
 684
 685         devc->sample_buf[devc->sample_buf_write++] = transfer;
 686         devc->samp_received += transfer->actual_length / NUM_CHANNELS;
 687
 688         sr_spew("receive_transfer(): calculated samplerate == %" PRIu64 "ks/s",
 689                 (uint64_t)(transfer->actual_length * 1000 /
 690                 (g_get_monotonic_time() - devc->read_start_ts + 1) /
 691                 NUM_CHANNELS));
 692
 693         sr_spew("receive_transfer(): status %s received %d bytes.",
 694                 libusb_error_name(transfer->status), transfer->actual_length);
 695
 696         if (transfer->actual_length == 0)
 697                 /* Nothing to send to the bus. */
 698                 return;
 699
 700         if (devc->limit_samples && devc->samp_received >= devc->limit_samples) {
 701                 sr_info("Requested number of samples reached, stopping. %"
 702                         PRIu64 " <= %" PRIu64, devc->limit_samples,
 703                         devc->samp_received);
 704                 send_data(sdi, devc->sample_buf, devc->limit_samples);
 705                 sdi->driver->dev_acquisition_stop(sdi);
 706         } else if (devc->limit_msec && (g_get_monotonic_time() -
 707                         devc->aq_started) / 1000 >= devc->limit_msec) {
 708                 sr_info("Requested time limit reached, stopping. %d <= %d",
 709                         (uint32_t)devc->limit_msec,
 710                         (uint32_t)(g_get_monotonic_time() - devc->aq_started) / 1000);
 711                 send_data(sdi, devc->sample_buf, devc->samp_received);
 712                 g_free(devc->sample_buf);
 713                 devc->sample_buf = NULL;
 714                 sdi->driver->dev_acquisition_stop(sdi);
 715         } else {
 716                 read_channel(sdi, data_amount(sdi));
 717         }
 718 }
 719
 720 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount)
 721 {
 722         int ret;
 723         struct dev_context *devc;
 724
 725         devc = sdi->priv;
 726
 727         amount = MIN(amount, MAX_PACKET_SIZE);
 728         ret = hantek_6xxx_get_channeldata(sdi, receive_transfer, amount);
 729         devc->read_start_ts = g_get_monotonic_time();
 730         devc->read_data_amount = amount;
 731
 732         return ret;
 733 }
 734
 735 static int handle_event(int fd, int revents, void *cb_data)
 736 {
 737         const struct sr_dev_inst *sdi;
 738         struct timeval tv;
 739         struct sr_dev_driver *di;
 740         struct dev_context *devc;
 741         struct drv_context *drvc;
 742
 743         (void)fd;
 744         (void)revents;
 745
 746         sdi = cb_data;
 747         di = sdi->driver;
 748         drvc = di->context;
 749         devc = sdi->priv;
 750
 751         /* Always handle pending libusb events. */
 752         tv.tv_sec = tv.tv_usec = 0;
 753         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 754
 755         if (devc->dev_state == STOPPING) {
 756                 /* We've been told to wind up the acquisition. */
 757                 sr_dbg("Stopping acquisition.");
 758
 759                 hantek_6xxx_stop_data_collecting(sdi);
 760                 /*
 761                  * TODO: Doesn't really cancel pending transfers so they might
 762                  * come in after SR_DF_END is sent.
 763                  */
 764                 usb_source_remove(sdi->session, drvc->sr_ctx);
 765
 766                 std_session_send_df_end(sdi);
 767
 768                 devc->dev_state = IDLE;
 769
 770                 return TRUE;
 771         }
 772
 773         return TRUE;
 774 }
 775
 776 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 777 {
 778         struct dev_context *devc;
 779         struct sr_dev_driver *di = sdi->driver;
 780         struct drv_context *drvc = di->context;
 781
 782         if (sdi->status != SR_ST_ACTIVE)
 783                 return SR_ERR_DEV_CLOSED;
 784
 785         devc = sdi->priv;
 786
 787         if (configure_channels(sdi) != SR_OK) {
 788                 sr_err("Failed to configure channels.");
 789                 return SR_ERR;
 790         }
 791
 792         if (hantek_6xxx_init(sdi) != SR_OK)
 793                 return SR_ERR;
 794
 795         std_session_send_df_header(sdi);
 796
 797         devc->samp_received = 0;
 798         devc->dev_state = FLUSH;
 799
 800         usb_source_add(sdi->session, drvc->sr_ctx, TICK,
 801                        handle_event, (void *)sdi);
 802
 803         hantek_6xxx_start_data_collecting(sdi);
 804
 805         read_channel(sdi, FLUSH_PACKET_SIZE);
 806
 807         return SR_OK;
 808 }
 809
 810 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 811 {
 812         struct dev_context *devc;
 813
 814         if (sdi->status != SR_ST_ACTIVE)
 815                 return SR_ERR;
 816
 817         devc = sdi->priv;
 818         devc->dev_state = STOPPING;
 819
 820         g_free(devc->sample_buf); devc->sample_buf = NULL;
 821
 822         return SR_OK;
 823 }
 824
 825 static struct sr_dev_driver hantek_6xxx_driver_info = {
 826         .name = "hantek-6xxx",
 827         .longname = "Hantek 6xxx",
 828         .api_version = 1,
 829         .init = std_init,
 830         .cleanup = std_cleanup,
 831         .scan = scan,
 832         .dev_list = std_dev_list,
 833         .dev_clear = dev_clear,
 834         .config_get = config_get,
 835         .config_set = config_set,
 836         .config_list = config_list,
 837         .dev_open = dev_open,
 838         .dev_close = dev_close,
 839         .dev_acquisition_start = dev_acquisition_start,
 840         .dev_acquisition_stop = dev_acquisition_stop,
 841         .context = NULL,
 842 };
 843 SR_REGISTER_DEV_DRIVER(hantek_6xxx_driver_info);