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)devc->vdivs[devc->voltage[ch]][0] / devc->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_COUPLING | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  47         SR_CONF_VDIV | 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 uint64_t vdivs[][2] = {
  63         VDIV_VALUES
  64 };
  65
  66 static const uint64_t vdivs_instrustar[][2] = {
  67         VDIV_VALUES_INSTRUSTAR
  68 };
  69
  70 static const uint64_t samplerates[] = {
  71         SAMPLERATE_VALUES
  72 };
  73
  74 static const struct hantek_6xxx_profile dev_profiles[] = {
  75         {
  76                 /* Windows: "Hantek6022BE DRIVER 1": 04b4:6022 */
  77                 0x04b4, 0x6022, 0x1d50, 0x608e, 0x0001,
  78                 "Hantek", "6022BE", "fx2lafw-hantek-6022be.fw",
  79                 ARRAY_AND_SIZE(dc_coupling), FALSE,
  80                 ARRAY_AND_SIZE(vdivs),
  81         },
  82         {
  83                 /* Windows: "Hantek6022BE DRIVER 2": 04b5:6022 */
  84                 0x04b5, 0x6022, 0x1d50, 0x608e, 0x0001,
  85                 "Hantek", "6022BE", "fx2lafw-hantek-6022be.fw",
  86                 ARRAY_AND_SIZE(dc_coupling), FALSE,
  87                 ARRAY_AND_SIZE(vdivs),
  88         },
  89         {
  90                 0x8102, 0x8102, 0x1d50, 0x608e, 0x0002,
  91                 "Sainsmart", "DDS120", "fx2lafw-sainsmart-dds120.fw",
  92                 ARRAY_AND_SIZE(acdc_coupling), TRUE,
  93                 ARRAY_AND_SIZE(vdivs),
  94         },
  95         {
  96                 /* Windows: "Hantek6022BL DRIVER 1": 04b4:602a */
  97                 0x04b4, 0x602a, 0x1d50, 0x608e, 0x0003,
  98                 "Hantek", "6022BL", "fx2lafw-hantek-6022bl.fw",
  99                 ARRAY_AND_SIZE(dc_coupling), FALSE,
 100                 ARRAY_AND_SIZE(vdivs),
 101         },
 102         {
 103                 /* Windows: "Hantek6022BL DRIVER 2": 04b5:602a */
 104                 0x04b5, 0x602a, 0x1d50, 0x608e, 0x0003,
 105                 "Hantek", "6022BL", "fx2lafw-hantek-6022bl.fw",
 106                 ARRAY_AND_SIZE(dc_coupling), FALSE,
 107                 ARRAY_AND_SIZE(vdivs),
 108         },
 109         {
 110                 0xd4a2, 0x5660, 0x1d50, 0x608e, 0x0004,
 111                 "YiXingDianZi", "MDSO", "fx2lafw-yixingdianzi-mdso.fw",
 112                 ARRAY_AND_SIZE(dc_coupling), FALSE,
 113                 ARRAY_AND_SIZE(vdivs),
 114         },
 115         {
 116                 /*"InstrustarISDS205": d4a2:5661 */
 117                 0xd4a2, 0x5661, 0x1d50, 0x608e, 0x0005,
 118                 "Instrustar", "ISDS205B", "fx2lafw-instrustar-isds205b.fw",
 119                 ARRAY_AND_SIZE(acdc_coupling), TRUE,
 120                 ARRAY_AND_SIZE(vdivs_instrustar),
 121         },
 122         ALL_ZERO
 123 };
 124
 125
 126 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount);
 127
 128 static struct sr_dev_inst *hantek_6xxx_dev_new(const struct hantek_6xxx_profile *prof)
 129 {
 130         struct sr_dev_inst *sdi;
 131         struct sr_channel *ch;
 132         struct sr_channel_group *cg;
 133         struct dev_context *devc;
 134         unsigned int i;
 135
 136         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 137         sdi->status = SR_ST_INITIALIZING;
 138         sdi->vendor = g_strdup(prof->vendor);
 139         sdi->model = g_strdup(prof->model);
 140
 141         for (i = 0; i < ARRAY_SIZE(channel_names); i++) {
 142                 ch = sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE, channel_names[i]);
 143                 cg = g_malloc0(sizeof(struct sr_channel_group));
 144                 cg->name = g_strdup(channel_names[i]);
 145                 cg->channels = g_slist_append(cg->channels, ch);
 146                 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 147         }
 148
 149         devc = g_malloc0(sizeof(struct dev_context));
 150
 151         for (i = 0; i < NUM_CHANNELS; i++) {
 152                 devc->ch_enabled[i] = TRUE;
 153                 devc->voltage[i] = DEFAULT_VOLTAGE;
 154                 devc->coupling[i] = DEFAULT_COUPLING;
 155         }
 156         devc->coupling_vals = prof->coupling_vals;
 157         devc->coupling_tab_size = prof->coupling_tab_size;
 158         devc->has_coupling = prof->has_coupling;
 159         devc->vdivs = prof->vdivs;
 160         devc->vdivs_size = prof->vdivs_size;
 161
 162         devc->profile = prof;
 163         devc->dev_state = IDLE;
 164         devc->samplerate = DEFAULT_SAMPLERATE;
 165
 166         sdi->priv = devc;
 167
 168         return sdi;
 169 }
 170
 171 static int configure_channels(const struct sr_dev_inst *sdi)
 172 {
 173         struct dev_context *devc;
 174         const GSList *l;
 175         int p;
 176         struct sr_channel *ch;
 177         devc = sdi->priv;
 178
 179         g_slist_free(devc->enabled_channels);
 180         devc->enabled_channels = NULL;
 181         memset(devc->ch_enabled, 0, sizeof(devc->ch_enabled));
 182
 183         for (l = sdi->channels, p = 0; l; l = l->next, p++) {
 184                 ch = l->data;
 185                 if (p < NUM_CHANNELS) {
 186                         devc->ch_enabled[p] = ch->enabled;
 187                         devc->enabled_channels = g_slist_append(devc->enabled_channels, ch);
 188                 }
 189         }
 190
 191         return SR_OK;
 192 }
 193
 194 static void clear_helper(struct dev_context *devc)
 195 {
 196         g_slist_free(devc->enabled_channels);
 197 }
 198
 199 static int dev_clear(const struct sr_dev_driver *di)
 200 {
 201         return std_dev_clear_with_callback(di, (std_dev_clear_callback)clear_helper);
 202 }
 203
 204 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 205 {
 206         struct drv_context *drvc;
 207         struct dev_context *devc;
 208         struct sr_dev_inst *sdi;
 209         struct sr_usb_dev_inst *usb;
 210         struct sr_config *src;
 211         const struct hantek_6xxx_profile *prof;
 212         GSList *l, *devices, *conn_devices;
 213         struct libusb_device_descriptor des;
 214         libusb_device **devlist;
 215         int i, j;
 216         const char *conn;
 217         char connection_id[64];
 218
 219         drvc = di->context;
 220
 221         devices = 0;
 222
 223         conn = NULL;
 224         for (l = options; l; l = l->next) {
 225                 src = l->data;
 226                 if (src->key == SR_CONF_CONN) {
 227                         conn = g_variant_get_string(src->data, NULL);
 228                         break;
 229                 }
 230         }
 231         if (conn)
 232                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 233         else
 234                 conn_devices = NULL;
 235
 236         /* Find all Hantek 60xx devices and upload firmware to all of them. */
 237         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 238         for (i = 0; devlist[i]; i++) {
 239                 if (conn) {
 240                         usb = NULL;
 241                         for (l = conn_devices; l; l = l->next) {
 242                                 usb = l->data;
 243                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 244                                         && usb->address == libusb_get_device_address(devlist[i]))
 245                                         break;
 246                         }
 247                         if (!l)
 248                                 /* This device matched none of the ones that
 249                                  * matched the conn specification. */
 250                                 continue;
 251                 }
 252
 253                 libusb_get_device_descriptor(devlist[i], &des);
 254
 255                 if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
 256                         continue;
 257
 258                 prof = NULL;
 259                 for (j = 0; dev_profiles[j].orig_vid; j++) {
 260                         if (des.idVendor == dev_profiles[j].orig_vid
 261                                 && des.idProduct == dev_profiles[j].orig_pid) {
 262                                 /* Device matches the pre-firmware profile. */
 263                                 prof = &dev_profiles[j];
 264                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 265                                 sdi = hantek_6xxx_dev_new(prof);
 266                                 sdi->connection_id = g_strdup(connection_id);
 267                                 devices = g_slist_append(devices, sdi);
 268                                 devc = sdi->priv;
 269                                 if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 270                                                 USB_CONFIGURATION, prof->firmware) == SR_OK) {
 271                                         /* Remember when the firmware on this device was updated. */
 272                                         devc->fw_updated = g_get_monotonic_time();
 273                                 } else {
 274                                         sr_err("Firmware upload failed, name %s.", prof->firmware);
 275                                 }
 276                                 /* Dummy USB address of 0xff will get overwritten later. */
 277                                 sdi->conn = sr_usb_dev_inst_new(
 278                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 279                                 break;
 280                         } else if (des.idVendor == dev_profiles[j].fw_vid
 281                                 && des.idProduct == dev_profiles[j].fw_pid
 282                                 && des.bcdDevice == dev_profiles[j].fw_prod_ver) {
 283                                 /* Device matches the post-firmware profile. */
 284                                 prof = &dev_profiles[j];
 285                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 286                                 sdi = hantek_6xxx_dev_new(prof);
 287                                 sdi->connection_id = g_strdup(connection_id);
 288                                 sdi->status = SR_ST_INACTIVE;
 289                                 devices = g_slist_append(devices, sdi);
 290                                 sdi->inst_type = SR_INST_USB;
 291                                 sdi->conn = sr_usb_dev_inst_new(
 292                                                 libusb_get_bus_number(devlist[i]),
 293                                                 libusb_get_device_address(devlist[i]), NULL);
 294                                 break;
 295                         }
 296                 }
 297                 if (!prof)
 298                         /* Not a supported VID/PID. */
 299                         continue;
 300         }
 301         libusb_free_device_list(devlist, 1);
 302
 303         return std_scan_complete(di, devices);
 304 }
 305
 306 static int dev_open(struct sr_dev_inst *sdi)
 307 {
 308         struct dev_context *devc;
 309         struct sr_usb_dev_inst *usb;
 310         int64_t timediff_us, timediff_ms;
 311         int err;
 312
 313         devc = sdi->priv;
 314         usb = sdi->conn;
 315
 316         /*
 317          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 318          * for the FX2 to renumerate.
 319          */
 320         err = SR_ERR;
 321         if (devc->fw_updated > 0) {
 322                 sr_info("Waiting for device to reset.");
 323                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 324                 g_usleep(300 * 1000);
 325                 timediff_ms = 0;
 326                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 327                         if ((err = hantek_6xxx_open(sdi)) == SR_OK)
 328                                 break;
 329                         g_usleep(100 * 1000);
 330                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 331                         timediff_ms = timediff_us / 1000;
 332                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 333                 }
 334                 if (timediff_ms < MAX_RENUM_DELAY_MS)
 335                         sr_info("Device came back after %"PRIu64" ms.", timediff_ms);
 336         } else {
 337                 err = hantek_6xxx_open(sdi);
 338         }
 339
 340         if (err != SR_OK) {
 341                 sr_err("Unable to open device.");
 342                 return SR_ERR;
 343         }
 344
 345         err = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 346         if (err != 0) {
 347                 sr_err("Unable to claim interface: %s.",
 348                         libusb_error_name(err));
 349                 return SR_ERR;
 350         }
 351
 352         return SR_OK;
 353 }
 354
 355 static int dev_close(struct sr_dev_inst *sdi)
 356 {
 357         hantek_6xxx_close(sdi);
 358
 359         return SR_OK;
 360 }
 361
 362 static int config_get(uint32_t key, GVariant **data,
 363         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 364 {
 365         struct dev_context *devc;
 366         struct sr_usb_dev_inst *usb;
 367         const uint64_t *vdiv;
 368         int ch_idx;
 369
 370         if (!sdi)
 371                 return SR_ERR_ARG;
 372
 373         devc = sdi->priv;
 374
 375         switch (key) {
 376         case SR_CONF_NUM_VDIV:
 377                 *data = g_variant_new_int32(devc->vdivs_size);
 378                 break;
 379         }
 380
 381         if (!cg) {
 382                 switch (key) {
 383                 case SR_CONF_SAMPLERATE:
 384                         *data = g_variant_new_uint64(devc->samplerate);
 385                         break;
 386                 case SR_CONF_LIMIT_MSEC:
 387                         *data = g_variant_new_uint64(devc->limit_msec);
 388                         break;
 389                 case SR_CONF_LIMIT_SAMPLES:
 390                         *data = g_variant_new_uint64(devc->limit_samples);
 391                         break;
 392                 case SR_CONF_CONN:
 393                         if (!sdi->conn)
 394                                 return SR_ERR_ARG;
 395                         usb = sdi->conn;
 396                         if (usb->address == 255)
 397                                 /* Device still needs to re-enumerate after firmware
 398                                  * upload, so we don't know its (future) address. */
 399                                 return SR_ERR;
 400                         *data = g_variant_new_printf("%d.%d", usb->bus, usb->address);
 401                         break;
 402                 default:
 403                         return SR_ERR_NA;
 404                 }
 405         } else {
 406                 if (sdi->channel_groups->data == cg)
 407                         ch_idx = 0;
 408                 else if (sdi->channel_groups->next->data == cg)
 409                         ch_idx = 1;
 410                 else
 411                         return SR_ERR_ARG;
 412                 switch (key) {
 413                 case SR_CONF_VDIV:
 414                         vdiv = devc->vdivs[devc->voltage[ch_idx]];
 415                         *data = g_variant_new("(tt)", vdiv[0], vdiv[1]);
 416                         break;
 417                 case SR_CONF_COUPLING:
 418                         *data = g_variant_new_string((devc->coupling[ch_idx] \
 419                                         == COUPLING_DC) ? "DC" : "AC");
 420                         break;
 421                 }
 422         }
 423
 424         return SR_OK;
 425 }
 426
 427 static int config_set(uint32_t key, GVariant *data,
 428         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 429 {
 430         struct dev_context *devc;
 431         int ch_idx, idx;
 432
 433         devc = sdi->priv;
 434         if (!cg) {
 435                 switch (key) {
 436                 case SR_CONF_SAMPLERATE:
 437                         devc->samplerate = g_variant_get_uint64(data);
 438                         hantek_6xxx_update_samplerate(sdi);
 439                         break;
 440                 case SR_CONF_LIMIT_MSEC:
 441                         devc->limit_msec = g_variant_get_uint64(data);
 442                         break;
 443                 case SR_CONF_LIMIT_SAMPLES:
 444                         devc->limit_samples = g_variant_get_uint64(data);
 445                         break;
 446                 default:
 447                         return SR_ERR_NA;
 448                 }
 449         } else {
 450                 if (sdi->channel_groups->data == cg)
 451                         ch_idx = 0;
 452                 else if (sdi->channel_groups->next->data == cg)
 453                         ch_idx = 1;
 454                 else
 455                         return SR_ERR_ARG;
 456                 switch (key) {
 457                 case SR_CONF_VDIV:
 458                         if ((idx = std_u64_tuple_idx(data, devc->vdivs, devc->vdivs_size)) < 0)
 459                                 return SR_ERR_ARG;
 460                         devc->voltage[ch_idx] = idx;
 461                         hantek_6xxx_update_vdiv(sdi);
 462                         break;
 463                 case SR_CONF_COUPLING:
 464                         if ((idx = std_str_idx(data, devc->coupling_vals,
 465                                                 devc->coupling_tab_size)) < 0)
 466                                 return SR_ERR_ARG;
 467                         devc->coupling[ch_idx] = idx;
 468                         hantek_6xxx_update_coupling(sdi);
 469                         break;
 470                 default:
 471                         return SR_ERR_NA;
 472                 }
 473         }
 474
 475         return SR_OK;
 476 }
 477
 478 static int config_list(uint32_t key, GVariant **data,
 479         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 480 {
 481         struct dev_context *devc;
 482
 483         devc = (sdi) ? sdi->priv : NULL;
 484
 485         if (!cg) {
 486                 switch (key) {
 487                 case SR_CONF_SCAN_OPTIONS:
 488                 case SR_CONF_DEVICE_OPTIONS:
 489                         return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
 490                 case SR_CONF_SAMPLERATE:
 491                         *data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates));
 492                         break;
 493                 default:
 494                         return SR_ERR_NA;
 495                 }
 496         } else {
 497                 switch (key) {
 498                 case SR_CONF_DEVICE_OPTIONS:
 499                         *data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg));
 500                         break;
 501                 case SR_CONF_COUPLING:
 502                         if (!devc)
 503                                 return SR_ERR_ARG;
 504                         *data = g_variant_new_strv(devc->coupling_vals, devc->coupling_tab_size);
 505                         break;
 506                 case SR_CONF_VDIV:
 507                         if (!devc)
 508                                 return SR_ERR_ARG;
 509                         *data = std_gvar_tuple_array(devc->vdivs,devc->vdivs_size);
 510                         break;
 511                 default:
 512                         return SR_ERR_NA;
 513                 }
 514         }
 515
 516         return SR_OK;
 517 }
 518
 519 /* Minimise data amount for limit_samples and limit_msec limits. */
 520 static uint32_t data_amount(const struct sr_dev_inst *sdi)
 521 {
 522         struct dev_context *devc = sdi->priv;
 523         uint32_t data_left, data_left_2, i;
 524         int32_t time_left;
 525
 526         if (devc->limit_msec) {
 527                 time_left = devc->limit_msec - (g_get_monotonic_time() - devc->aq_started) / 1000;
 528                 data_left = devc->samplerate * MAX(time_left, 0) * NUM_CHANNELS / 1000;
 529         } else if (devc->limit_samples) {
 530                 data_left = (devc->limit_samples - devc->samp_received) * NUM_CHANNELS;
 531         } else {
 532                 data_left = devc->samplerate * NUM_CHANNELS;
 533         }
 534
 535         /* Round up to nearest power of two. */
 536         for (i = MIN_PACKET_SIZE; i < data_left; i *= 2)
 537                 ;
 538         data_left_2 = i;
 539
 540         sr_spew("data_amount: %u (rounded to power of 2: %u)", data_left, data_left_2);
 541
 542         return data_left_2;
 543 }
 544
 545 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 546                 int num_samples)
 547 {
 548         struct sr_datafeed_packet packet;
 549         struct sr_datafeed_analog analog;
 550         struct sr_analog_encoding encoding;
 551         struct sr_analog_meaning meaning;
 552         struct sr_analog_spec spec;
 553         struct dev_context *devc = sdi->priv;
 554         GSList *channels = devc->enabled_channels;
 555
 556         const float ch_bit[] = { RANGE(0) / 255, RANGE(1) / 255 };
 557         const float ch_center[] = { RANGE(0) / 2, RANGE(1) / 2 };
 558
 559         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
 560
 561         packet.type = SR_DF_ANALOG;
 562         packet.payload = &analog;
 563
 564         analog.num_samples = num_samples;
 565         analog.meaning->mq = SR_MQ_VOLTAGE;
 566         analog.meaning->unit = SR_UNIT_VOLT;
 567         analog.meaning->mqflags = 0;
 568
 569         analog.data = g_try_malloc(num_samples * sizeof(float));
 570         if (!analog.data) {
 571                 sr_err("Analog data buffer malloc failed.");
 572                 devc->dev_state = STOPPING;
 573                 return;
 574         }
 575
 576         for (int ch = 0; ch < NUM_CHANNELS; ch++) {
 577                 if (!devc->ch_enabled[ch])
 578                         continue;
 579
 580                 float vdivlog = log10f(ch_bit[ch]);
 581                 int digits = -(int)vdivlog + (vdivlog < 0.0);
 582                 analog.encoding->digits = digits;
 583                 analog.spec->spec_digits = digits;
 584                 analog.meaning->channels = g_slist_append(NULL, channels->data);
 585
 586                 for (int i = 0; i < num_samples; i++) {
 587                         /*
 588                          * The device always sends data for both channels. If a channel
 589                          * is disabled, it contains a copy of the enabled channel's
 590                          * data. However, we only send the requested channels to
 591                          * the bus.
 592                          *
 593                          * Voltage values are encoded as a value 0-255, where the
 594                          * value is a point in the range represented by the vdiv
 595                          * setting. There are 10 vertical divs, so e.g. 500mV/div
 596                          * represents 5V peak-to-peak where 0 = -2.5V and 255 = +2.5V.
 597                          */
 598                         ((float *)analog.data)[i] = ch_bit[ch] * *(buf + i * 2 + ch) - ch_center[ch];
 599                 }
 600
 601                 sr_session_send(sdi, &packet);
 602                 g_slist_free(analog.meaning->channels);
 603
 604                 channels = channels->next;
 605         }
 606         g_free(analog.data);
 607 }
 608
 609 /*
 610  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 611  * Only channel data comes in asynchronously, and all transfers for this are
 612  * queued up beforehand, so this just needs to chuck the incoming data onto
 613  * the libsigrok session bus.
 614  */
 615 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 616 {
 617         struct sr_dev_inst *sdi;
 618         struct dev_context *devc;
 619
 620         sdi = transfer->user_data;
 621         devc = sdi->priv;
 622
 623         if (devc->dev_state == FLUSH) {
 624                 g_free(transfer->buffer);
 625                 libusb_free_transfer(transfer);
 626                 devc->dev_state = CAPTURE;
 627                 devc->aq_started = g_get_monotonic_time();
 628                 read_channel(sdi, data_amount(sdi));
 629                 return;
 630         }
 631
 632         if (devc->dev_state != CAPTURE)
 633                 return;
 634
 635         sr_spew("receive_transfer(): calculated samplerate == %" PRIu64 "ks/s",
 636                 (uint64_t)(transfer->actual_length * 1000 /
 637                 (g_get_monotonic_time() - devc->read_start_ts + 1) /
 638                 NUM_CHANNELS));
 639
 640         sr_spew("receive_transfer(): status %s received %d bytes.",
 641                 libusb_error_name(transfer->status), transfer->actual_length);
 642
 643         if (transfer->actual_length == 0)
 644                 /* Nothing to send to the bus. */
 645                 return;
 646
 647         unsigned samples_received = transfer->actual_length / NUM_CHANNELS;
 648         send_chunk(sdi, transfer->buffer, samples_received);
 649         devc->samp_received += samples_received;
 650
 651         g_free(transfer->buffer);
 652         libusb_free_transfer(transfer);
 653
 654         if (devc->limit_samples && devc->samp_received >= devc->limit_samples) {
 655                 sr_info("Requested number of samples reached, stopping. %"
 656                         PRIu64 " <= %" PRIu64, devc->limit_samples,
 657                         devc->samp_received);
 658                 sr_dev_acquisition_stop(sdi);
 659         } else if (devc->limit_msec && (g_get_monotonic_time() -
 660                         devc->aq_started) / 1000 >= devc->limit_msec) {
 661                 sr_info("Requested time limit reached, stopping. %d <= %d",
 662                         (uint32_t)devc->limit_msec,
 663                         (uint32_t)(g_get_monotonic_time() - devc->aq_started) / 1000);
 664                 sr_dev_acquisition_stop(sdi);
 665         } else {
 666                 read_channel(sdi, data_amount(sdi));
 667         }
 668 }
 669
 670 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount)
 671 {
 672         int ret;
 673         struct dev_context *devc;
 674
 675         devc = sdi->priv;
 676
 677         amount = MIN(amount, MAX_PACKET_SIZE);
 678         ret = hantek_6xxx_get_channeldata(sdi, receive_transfer, amount);
 679         devc->read_start_ts = g_get_monotonic_time();
 680
 681         return ret;
 682 }
 683
 684 static int handle_event(int fd, int revents, void *cb_data)
 685 {
 686         const struct sr_dev_inst *sdi;
 687         struct timeval tv;
 688         struct sr_dev_driver *di;
 689         struct dev_context *devc;
 690         struct drv_context *drvc;
 691
 692         (void)fd;
 693         (void)revents;
 694
 695         sdi = cb_data;
 696         di = sdi->driver;
 697         drvc = di->context;
 698         devc = sdi->priv;
 699
 700         /* Always handle pending libusb events. */
 701         tv.tv_sec = tv.tv_usec = 0;
 702         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 703
 704         if (devc->dev_state == STOPPING) {
 705                 /* We've been told to wind up the acquisition. */
 706                 sr_dbg("Stopping acquisition.");
 707
 708                 hantek_6xxx_stop_data_collecting(sdi);
 709                 /*
 710                  * TODO: Doesn't really cancel pending transfers so they might
 711                  * come in after SR_DF_END is sent.
 712                  */
 713                 usb_source_remove(sdi->session, drvc->sr_ctx);
 714
 715                 std_session_send_df_end(sdi);
 716
 717                 devc->dev_state = IDLE;
 718
 719                 return TRUE;
 720         }
 721
 722         return TRUE;
 723 }
 724
 725 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 726 {
 727         struct dev_context *devc;
 728         struct sr_dev_driver *di = sdi->driver;
 729         struct drv_context *drvc = di->context;
 730
 731         devc = sdi->priv;
 732
 733         if (configure_channels(sdi) != SR_OK) {
 734                 sr_err("Failed to configure channels.");
 735                 return SR_ERR;
 736         }
 737
 738         if (hantek_6xxx_init(sdi) != SR_OK)
 739                 return SR_ERR;
 740
 741         std_session_send_df_header(sdi);
 742
 743         devc->samp_received = 0;
 744         devc->dev_state = FLUSH;
 745
 746         usb_source_add(sdi->session, drvc->sr_ctx, TICK,
 747                        handle_event, (void *)sdi);
 748
 749         hantek_6xxx_start_data_collecting(sdi);
 750
 751         read_channel(sdi, FLUSH_PACKET_SIZE);
 752
 753         return SR_OK;
 754 }
 755
 756 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 757 {
 758         struct dev_context *devc;
 759
 760         devc = sdi->priv;
 761         devc->dev_state = STOPPING;
 762
 763         return SR_OK;
 764 }
 765
 766 static struct sr_dev_driver hantek_6xxx_driver_info = {
 767         .name = "hantek-6xxx",
 768         .longname = "Hantek 6xxx",
 769         .api_version = 1,
 770         .init = std_init,
 771         .cleanup = std_cleanup,
 772         .scan = scan,
 773         .dev_list = std_dev_list,
 774         .dev_clear = dev_clear,
 775         .config_get = config_get,
 776         .config_set = config_set,
 777         .config_list = config_list,
 778         .dev_open = dev_open,
 779         .dev_close = dev_close,
 780         .dev_acquisition_start = dev_acquisition_start,
 781         .dev_acquisition_stop = dev_acquisition_stop,
 782         .context = NULL,
 783 };
 784 SR_REGISTER_DEV_DRIVER(hantek_6xxx_driver_info);