hardware/hantek-dso/api.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2012 Bert Vermeulen <bert@biot.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 <stdio.h>
  21 #include <stdint.h>
  22 #include <stdlib.h>
  23 #include <sys/types.h>
  24 #include <sys/stat.h>
  25 #include <fcntl.h>
  26 #include <unistd.h>
  27 #include <string.h>
  28 #include <sys/time.h>
  29 #include <inttypes.h>
  30 #include <glib.h>
  31 #include <libusb.h>
  32 #include "libsigrok.h"
  33 #include "libsigrok-internal.h"
  34 #include "dso.h"
  35
  36 /* Max time in ms before we want to check on USB events */
  37 /* TODO tune this properly */
  38 #define TICK 1
  39
  40 static const int hwcaps[] = {
  41         SR_CONF_OSCILLOSCOPE,
  42         SR_CONF_LIMIT_SAMPLES,
  43         SR_CONF_CONTINUOUS,
  44         SR_CONF_TIMEBASE,
  45         SR_CONF_BUFFERSIZE,
  46         SR_CONF_TRIGGER_SOURCE,
  47         SR_CONF_TRIGGER_SLOPE,
  48         SR_CONF_HORIZ_TRIGGERPOS,
  49         SR_CONF_FILTER,
  50         SR_CONF_VDIV,
  51         SR_CONF_COUPLING,
  52         0,
  53 };
  54
  55 static const char *probe_names[] = {
  56         "CH1", "CH2",
  57         NULL,
  58 };
  59
  60 static const struct dso_profile dev_profiles[] = {
  61         {       0x04b4, 0x2090, 0x04b5, 0x2090,
  62                 "Hantek", "DSO-2090",
  63                 FIRMWARE_DIR "/hantek-dso-2xxx.fw" },
  64         {       0x04b4, 0x2150, 0x04b5, 0x2150,
  65                 "Hantek", "DSO-2150",
  66                 FIRMWARE_DIR "/hantek-dso-2xxx.fw" },
  67         {       0x04b4, 0x2250, 0x04b5, 0x2250,
  68                 "Hantek", "DSO-2250",
  69                 FIRMWARE_DIR "/hantek-dso-2xxx.fw" },
  70         {       0x04b4, 0x5200, 0x04b5, 0x5200,
  71                 "Hantek", "DSO-5200",
  72                 FIRMWARE_DIR "/hantek-dso-5xxx.fw" },
  73         {       0x04b4, 0x520a, 0x04b5, 0x520a,
  74                 "Hantek", "DSO-5200A",
  75                 FIRMWARE_DIR "/hantek-dso-5xxx.fw" },
  76         { 0, 0, 0, 0, 0, 0, 0 },
  77 };
  78
  79 static const uint64_t buffersizes[] = {
  80         10240,
  81         32768,
  82         /* TODO: 65535 */
  83         0,
  84 };
  85
  86 static const struct sr_rational timebases[] = {
  87         /* microseconds */
  88         { 10, 1000000 },
  89         { 20, 1000000 },
  90         { 40, 1000000 },
  91         { 100, 1000000 },
  92         { 200, 1000000 },
  93         { 400, 1000000 },
  94         /* milliseconds */
  95         { 1, 1000 },
  96         { 2, 1000 },
  97         { 4, 1000 },
  98         { 10, 1000 },
  99         { 20, 1000 },
 100         { 40, 1000 },
 101         { 100, 1000 },
 102         { 200, 1000 },
 103         { 400, 1000 },
 104         { 0, 0},
 105 };
 106
 107 static const struct sr_rational vdivs[] = {
 108         /* millivolts */
 109         { 10, 1000 },
 110         { 20, 1000 },
 111         { 50, 1000 },
 112         { 100, 1000 },
 113         { 200, 1000 },
 114         { 500, 1000 },
 115         /* volts */
 116         { 1, 1 },
 117         { 2, 1 },
 118         { 5, 1 },
 119         { 0, 0 },
 120 };
 121
 122 static const char *trigger_sources[] = {
 123         "CH1",
 124         "CH2",
 125         "EXT",
 126         /* TODO: forced */
 127         NULL,
 128 };
 129
 130 static const char *filter_targets[] = {
 131         "CH1",
 132         "CH2",
 133         /* TODO: "TRIGGER", */
 134         NULL,
 135 };
 136
 137 static const char *coupling[] = {
 138         "AC",
 139         "DC",
 140         "GND",
 141         NULL,
 142 };
 143
 144 SR_PRIV struct sr_dev_driver hantek_dso_driver_info;
 145 static struct sr_dev_driver *di = &hantek_dso_driver_info;
 146
 147 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
 148
 149 static struct sr_dev_inst *dso_dev_new(int index, const struct dso_profile *prof)
 150 {
 151         struct sr_dev_inst *sdi;
 152         struct sr_probe *probe;
 153         struct drv_context *drvc;
 154         struct dev_context *devc;
 155         int i;
 156
 157         sdi = sr_dev_inst_new(index, SR_ST_INITIALIZING,
 158                 prof->vendor, prof->model, NULL);
 159         if (!sdi)
 160                 return NULL;
 161         sdi->driver = di;
 162
 163         /*
 164          * Add only the real probes -- EXT isn't a source of data, only
 165          * a trigger source internal to the device.
 166          */
 167         for (i = 0; probe_names[i]; i++) {
 168                 if (!(probe = sr_probe_new(i, SR_PROBE_ANALOG, TRUE,
 169                                 probe_names[i])))
 170                         return NULL;
 171                 sdi->probes = g_slist_append(sdi->probes, probe);
 172         }
 173
 174         if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
 175                 sr_err("Device context malloc failed.");
 176                 return NULL;
 177         }
 178
 179         devc->profile = prof;
 180         devc->dev_state = IDLE;
 181         devc->timebase = DEFAULT_TIMEBASE;
 182         devc->ch1_enabled = TRUE;
 183         devc->ch2_enabled = TRUE;
 184         devc->voltage_ch1 = DEFAULT_VOLTAGE;
 185         devc->voltage_ch2 = DEFAULT_VOLTAGE;
 186         devc->coupling_ch1 = DEFAULT_COUPLING;
 187         devc->coupling_ch2 = DEFAULT_COUPLING;
 188         devc->voffset_ch1 = DEFAULT_VERT_OFFSET;
 189         devc->voffset_ch2 = DEFAULT_VERT_OFFSET;
 190         devc->voffset_trigger = DEFAULT_VERT_TRIGGERPOS;
 191         devc->framesize = DEFAULT_FRAMESIZE;
 192         devc->triggerslope = SLOPE_POSITIVE;
 193         devc->triggersource = g_strdup(DEFAULT_TRIGGER_SOURCE);
 194         devc->triggerposition = DEFAULT_HORIZ_TRIGGERPOS;
 195         sdi->priv = devc;
 196         drvc = di->priv;
 197         drvc->instances = g_slist_append(drvc->instances, sdi);
 198
 199         return sdi;
 200 }
 201
 202 static int configure_probes(const struct sr_dev_inst *sdi)
 203 {
 204         struct dev_context *devc;
 205         const struct sr_probe *probe;
 206         const GSList *l;
 207
 208         devc = sdi->priv;
 209
 210         devc->ch1_enabled = devc->ch2_enabled = FALSE;
 211         for (l = sdi->probes; l; l = l->next) {
 212                 probe = (struct sr_probe *)l->data;
 213                 if (probe->index == 0)
 214                         devc->ch1_enabled = probe->enabled;
 215                 else if (probe->index == 1)
 216                         devc->ch2_enabled = probe->enabled;
 217         }
 218
 219         return SR_OK;
 220 }
 221
 222 /* Properly close and free all devices. */
 223 static int clear_instances(void)
 224 {
 225         struct sr_dev_inst *sdi;
 226         struct drv_context *drvc;
 227         struct dev_context *devc;
 228         GSList *l;
 229
 230         drvc = di->priv;
 231         for (l = drvc->instances; l; l = l->next) {
 232                 if (!(sdi = l->data)) {
 233                         /* Log error, but continue cleaning up the rest. */
 234                         sr_err("%s: sdi was NULL, continuing", __func__);
 235                         continue;
 236                 }
 237                 if (!(devc = sdi->priv)) {
 238                         /* Log error, but continue cleaning up the rest. */
 239                         sr_err("%s: sdi->priv was NULL, continuing", __func__);
 240                         continue;
 241                 }
 242                 dso_close(sdi);
 243                 sr_usb_dev_inst_free(devc->usb);
 244                 g_free(devc->triggersource);
 245
 246                 sr_dev_inst_free(sdi);
 247         }
 248
 249         g_slist_free(drvc->instances);
 250         drvc->instances = NULL;
 251
 252         return SR_OK;
 253 }
 254
 255 static int hw_init(struct sr_context *sr_ctx)
 256 {
 257         struct drv_context *drvc;
 258
 259         if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
 260                 sr_err("Driver context malloc failed.");
 261                 return SR_ERR_MALLOC;
 262         }
 263
 264         drvc->sr_ctx = sr_ctx;
 265         di->priv = drvc;
 266
 267         return SR_OK;
 268 }
 269
 270 static GSList *hw_scan(GSList *options)
 271 {
 272         struct sr_dev_inst *sdi;
 273         const struct dso_profile *prof;
 274         struct drv_context *drvc;
 275         struct dev_context *devc;
 276         GSList *devices;
 277         struct libusb_device_descriptor des;
 278         libusb_device **devlist;
 279         int devcnt, ret, i, j;
 280
 281         (void)options;
 282
 283         devcnt = 0;
 284         devices = 0;
 285         drvc = di->priv;
 286         drvc->instances = NULL;
 287
 288         clear_instances();
 289
 290         /* Find all Hantek DSO devices and upload firmware to all of them. */
 291         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 292         for (i = 0; devlist[i]; i++) {
 293                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 294                         sr_err("Failed to get device descriptor: %s.",
 295                                libusb_error_name(ret));
 296                         continue;
 297                 }
 298
 299                 prof = NULL;
 300                 for (j = 0; dev_profiles[j].orig_vid; j++) {
 301                         if (des.idVendor == dev_profiles[j].orig_vid
 302                                 && des.idProduct == dev_profiles[j].orig_pid) {
 303                                 /* Device matches the pre-firmware profile. */
 304                                 prof = &dev_profiles[j];
 305                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 306                                 sdi = dso_dev_new(devcnt, prof);
 307                                 devices = g_slist_append(devices, sdi);
 308                                 devc = sdi->priv;
 309                                 if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 310                                                 prof->firmware) == SR_OK)
 311                                         /* Remember when the firmware on this device was updated */
 312                                         devc->fw_updated = g_get_monotonic_time();
 313                                 else
 314                                         sr_err("Firmware upload failed for "
 315                                                "device %d.", devcnt);
 316                                 /* Dummy USB address of 0xff will get overwritten later. */
 317                                 devc->usb = sr_usb_dev_inst_new(
 318                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 319                                 devcnt++;
 320                                 break;
 321                         } else if (des.idVendor == dev_profiles[j].fw_vid
 322                                 && des.idProduct == dev_profiles[j].fw_pid) {
 323                                 /* Device matches the post-firmware profile. */
 324                                 prof = &dev_profiles[j];
 325                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 326                                 sdi = dso_dev_new(devcnt, prof);
 327                                 sdi->status = SR_ST_INACTIVE;
 328                                 devices = g_slist_append(devices, sdi);
 329                                 devc = sdi->priv;
 330                                 devc->usb = sr_usb_dev_inst_new(
 331                                                 libusb_get_bus_number(devlist[i]),
 332                                                 libusb_get_device_address(devlist[i]), NULL);
 333                                 devcnt++;
 334                                 break;
 335                         }
 336                 }
 337                 if (!prof)
 338                         /* not a supported VID/PID */
 339                         continue;
 340         }
 341         libusb_free_device_list(devlist, 1);
 342
 343         return devices;
 344 }
 345
 346 static GSList *hw_dev_list(void)
 347 {
 348         struct drv_context *drvc;
 349
 350         drvc = di->priv;
 351
 352         return drvc->instances;
 353 }
 354
 355 static int hw_dev_open(struct sr_dev_inst *sdi)
 356 {
 357         struct dev_context *devc;
 358         int64_t timediff_us, timediff_ms;
 359         int err;
 360
 361         devc = sdi->priv;
 362
 363         /*
 364          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 365          * for the FX2 to renumerate.
 366          */
 367         err = SR_ERR;
 368         if (devc->fw_updated > 0) {
 369                 sr_info("Waiting for device to reset.");
 370                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 371                 g_usleep(300 * 1000);
 372                 timediff_ms = 0;
 373                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 374                         if ((err = dso_open(sdi)) == SR_OK)
 375                                 break;
 376                         g_usleep(100 * 1000);
 377                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 378                         timediff_ms = timediff_us / 1000;
 379                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 380                 }
 381                 sr_info("Device came back after %d ms.", timediff_ms);
 382         } else {
 383                 err = dso_open(sdi);
 384         }
 385
 386         if (err != SR_OK) {
 387                 sr_err("Unable to open device.");
 388                 return SR_ERR;
 389         }
 390
 391         err = libusb_claim_interface(devc->usb->devhdl, USB_INTERFACE);
 392         if (err != 0) {
 393                 sr_err("Unable to claim interface: %s.",
 394                        libusb_error_name(err));
 395                 return SR_ERR;
 396         }
 397
 398         return SR_OK;
 399 }
 400
 401 static int hw_dev_close(struct sr_dev_inst *sdi)
 402 {
 403         dso_close(sdi);
 404
 405         return SR_OK;
 406 }
 407
 408 static int hw_cleanup(void)
 409 {
 410         struct drv_context *drvc;
 411
 412         if (!(drvc = di->priv))
 413                 return SR_OK;
 414
 415         clear_instances();
 416
 417         return SR_OK;
 418 }
 419
 420 static int hw_info_get(int info_id, const void **data,
 421                        const struct sr_dev_inst *sdi)
 422 {
 423         uint64_t tmp;
 424
 425         (void)sdi;
 426
 427         switch (info_id) {
 428         case SR_DI_HWCAPS:
 429                 *data = hwcaps;
 430                 break;
 431         case SR_DI_BUFFERSIZES:
 432                 *data = buffersizes;
 433                 break;
 434         case SR_DI_TIMEBASES:
 435                 *data = timebases;
 436                 break;
 437         case SR_DI_TRIGGER_SOURCES:
 438                 *data = trigger_sources;
 439                 break;
 440         case SR_DI_FILTERS:
 441                 *data = filter_targets;
 442                 break;
 443         case SR_DI_VDIVS:
 444                 *data = vdivs;
 445                 break;
 446         case SR_DI_COUPLING:
 447                 *data = coupling;
 448                 break;
 449         /* TODO remove this */
 450         case SR_DI_CUR_SAMPLERATE:
 451                 *data = &tmp;
 452                 break;
 453         default:
 454                 return SR_ERR_ARG;
 455         }
 456
 457         return SR_OK;
 458 }
 459
 460 static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
 461                              const void *value)
 462 {
 463         struct dev_context *devc;
 464         struct sr_rational tmp_rat;
 465         float tmp_float;
 466         uint64_t tmp_u64;
 467         int ret, i;
 468         char **targets;
 469
 470         if (sdi->status != SR_ST_ACTIVE)
 471                 return SR_ERR;
 472
 473         ret = SR_OK;
 474         devc = sdi->priv;
 475         switch (hwcap) {
 476         case SR_CONF_LIMIT_FRAMES:
 477                 devc->limit_frames = *(const uint64_t *)value;
 478                 break;
 479         case SR_CONF_TRIGGER_SLOPE:
 480                 tmp_u64 = *(const int *)value;
 481                 if (tmp_u64 != SLOPE_NEGATIVE && tmp_u64 != SLOPE_POSITIVE)
 482                         ret = SR_ERR_ARG;
 483                 devc->triggerslope = tmp_u64;
 484                 break;
 485         case SR_CONF_HORIZ_TRIGGERPOS:
 486                 tmp_float = *(const float *)value;
 487                 if (tmp_float < 0.0 || tmp_float > 1.0) {
 488                         sr_err("Trigger position should be between 0.0 and 1.0.");
 489                         ret = SR_ERR_ARG;
 490                 } else
 491                         devc->triggerposition = tmp_float;
 492                 break;
 493         case SR_CONF_BUFFERSIZE:
 494                 tmp_u64 = *(const int *)value;
 495                 for (i = 0; buffersizes[i]; i++) {
 496                         if (buffersizes[i] == tmp_u64) {
 497                                 devc->framesize = tmp_u64;
 498                                 break;
 499                         }
 500                 }
 501                 if (buffersizes[i] == 0)
 502                         ret = SR_ERR_ARG;
 503                 break;
 504         case SR_CONF_TIMEBASE:
 505                 tmp_rat = *(const struct sr_rational *)value;
 506                 for (i = 0; timebases[i].p && timebases[i].q; i++) {
 507                         if (timebases[i].p == tmp_rat.p
 508                                         && timebases[i].q == tmp_rat.q) {
 509                                 devc->timebase = i;
 510                                 break;
 511                         }
 512                 }
 513                 if (timebases[i].p == 0 && timebases[i].q == 0)
 514                         ret = SR_ERR_ARG;
 515                 break;
 516         case SR_CONF_TRIGGER_SOURCE:
 517                 for (i = 0; trigger_sources[i]; i++) {
 518                         if (!strcmp(value, trigger_sources[i])) {
 519                                 devc->triggersource = g_strdup(value);
 520                                 break;
 521                         }
 522                 }
 523                 if (trigger_sources[i] == 0)
 524                         ret = SR_ERR_ARG;
 525                 break;
 526         case SR_CONF_FILTER:
 527                 devc->filter_ch1 = devc->filter_ch2 = devc->filter_trigger = 0;
 528                 targets = g_strsplit(value, ",", 0);
 529                 for (i = 0; targets[i]; i++) {
 530                         if (targets[i] == '\0')
 531                                 /* Empty filter string can be used to clear them all. */
 532                                 ;
 533                         else if (!strcmp(targets[i], "CH1"))
 534                                 devc->filter_ch1 = TRUE;
 535                         else if (!strcmp(targets[i], "CH2"))
 536                                 devc->filter_ch2 = TRUE;
 537                         else if (!strcmp(targets[i], "TRIGGER"))
 538                                 devc->filter_trigger = TRUE;
 539                         else {
 540                                 sr_err("Invalid filter target %s.", targets[i]);
 541                                 ret = SR_ERR_ARG;
 542                         }
 543                 }
 544                 g_strfreev(targets);
 545                 break;
 546         case SR_CONF_VDIV:
 547                 /* TODO: Not supporting vdiv per channel yet. */
 548                 tmp_rat = *(const struct sr_rational *)value;
 549                 for (i = 0; vdivs[i].p && vdivs[i].q; i++) {
 550                         if (vdivs[i].p == tmp_rat.p
 551                                         && vdivs[i].q == tmp_rat.q) {
 552                                 devc->voltage_ch1 = i;
 553                                 devc->voltage_ch2 = i;
 554                                 break;
 555                         }
 556                 }
 557                 if (vdivs[i].p == 0 && vdivs[i].q == 0)
 558                         ret = SR_ERR_ARG;
 559                 break;
 560         case SR_CONF_COUPLING:
 561                 /* TODO: Not supporting coupling per channel yet. */
 562                 for (i = 0; coupling[i]; i++) {
 563                         if (!strcmp(value, coupling[i])) {
 564                                 devc->coupling_ch1 = i;
 565                                 devc->coupling_ch2 = i;
 566                                 break;
 567                         }
 568                 }
 569                 if (coupling[i] == 0)
 570                         ret = SR_ERR_ARG;
 571                 break;
 572         default:
 573                 ret = SR_ERR_ARG;
 574                 break;
 575         }
 576
 577         return ret;
 578 }
 579
 580 static void send_chunk(struct dev_context *devc, unsigned char *buf,
 581                 int num_samples)
 582 {
 583         struct sr_datafeed_packet packet;
 584         struct sr_datafeed_analog analog;
 585         float ch1, ch2, range;
 586         int num_probes, data_offset, i;
 587
 588         num_probes = (devc->ch1_enabled && devc->ch2_enabled) ? 2 : 1;
 589         packet.type = SR_DF_ANALOG;
 590         packet.payload = &analog;
 591         /* TODO: support for 5xxx series 9-bit samples */
 592         analog.num_samples = num_samples;
 593         analog.mq = SR_MQ_VOLTAGE;
 594         analog.unit = SR_UNIT_VOLT;
 595         /* TODO: Check malloc return value. */
 596         analog.data = g_try_malloc(analog.num_samples * sizeof(float) * num_probes);
 597         data_offset = 0;
 598         for (i = 0; i < analog.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 (0-512 on the
 606                  * DSO-5200*), where the value is a point in the range
 607                  * represented by the vdiv setting. There are 8 vertical divs,
 608                  * so e.g. 500mV/div represents 4V peak-to-peak where 0 = -2V
 609                  * and 255 = +2V.
 610                  */
 611                 /* TODO: Support for DSO-5xxx series 9-bit samples. */
 612                 if (devc->ch1_enabled) {
 613                         range = ((float)vdivs[devc->voltage_ch1].p / vdivs[devc->voltage_ch1].q) * 8;
 614                         ch1 = range / 255 * *(buf + i * 2 + 1);
 615                         /* Value is centered around 0V. */
 616                         ch1 -= range / 2;
 617                         analog.data[data_offset++] = ch1;
 618                 }
 619                 if (devc->ch2_enabled) {
 620                         range = ((float)vdivs[devc->voltage_ch2].p / vdivs[devc->voltage_ch2].q) * 8;
 621                         ch2 = range / 255 * *(buf + i * 2);
 622                         ch2 -= range / 2;
 623                         analog.data[data_offset++] = ch2;
 624                 }
 625         }
 626         sr_session_send(devc->cb_data, &packet);
 627 }
 628
 629 /*
 630  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 631  * Only channel data comes in asynchronously, and all transfers for this are
 632  * queued up beforehand, so this just needs to chuck the incoming data onto
 633  * the libsigrok session bus.
 634  */
 635 static void receive_transfer(struct libusb_transfer *transfer)
 636 {
 637         struct sr_datafeed_packet packet;
 638         struct dev_context *devc;
 639         int num_samples, pre;
 640
 641         devc = transfer->user_data;
 642         sr_dbg("receive_transfer(): status %d received %d bytes.",
 643                transfer->status, transfer->actual_length);
 644
 645         if (transfer->actual_length == 0)
 646                 /* Nothing to send to the bus. */
 647                 return;
 648
 649         num_samples = transfer->actual_length / 2;
 650
 651         sr_dbg("Got %d-%d/%d samples in frame.", devc->samp_received + 1,
 652                devc->samp_received + num_samples, devc->framesize);
 653
 654         /*
 655          * The device always sends a full frame, but the beginning of the frame
 656          * doesn't represent the trigger point. The offset at which the trigger
 657          * happened came in with the capture state, so we need to start sending
 658          * from there up the session bus. The samples in the frame buffer
 659          * before that trigger point came after the end of the device's frame
 660          * buffer was reached, and it wrapped around to overwrite up until the
 661          * trigger point.
 662          */
 663         if (devc->samp_received < devc->trigger_offset) {
 664                 /* Trigger point not yet reached. */
 665                 if (devc->samp_received + num_samples < devc->trigger_offset) {
 666                         /* The entire chunk is before the trigger point. */
 667                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 668                                         transfer->buffer, num_samples * 2);
 669                         devc->samp_buffered += num_samples;
 670                 } else {
 671                         /*
 672                          * This chunk hits or overruns the trigger point.
 673                          * Store the part before the trigger fired, and
 674                          * send the rest up to the session bus.
 675                          */
 676                         pre = devc->trigger_offset - devc->samp_received;
 677                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 678                                         transfer->buffer, pre * 2);
 679                         devc->samp_buffered += pre;
 680
 681                         /* The rest of this chunk starts with the trigger point. */
 682                         sr_dbg("Reached trigger point, %d samples buffered.",
 683                                devc->samp_buffered);
 684
 685                         /* Avoid the corner case where the chunk ended at
 686                          * exactly the trigger point. */
 687                         if (num_samples > pre)
 688                                 send_chunk(devc, transfer->buffer + pre * 2,
 689                                                 num_samples - pre);
 690                 }
 691         } else {
 692                 /* Already past the trigger point, just send it all out. */
 693                 send_chunk(devc, transfer->buffer,
 694                                 num_samples);
 695         }
 696
 697         devc->samp_received += num_samples;
 698
 699         /* Everything in this transfer was either copied to the buffer or
 700          * sent to the session bus. */
 701         g_free(transfer->buffer);
 702         libusb_free_transfer(transfer);
 703
 704         if (devc->samp_received >= devc->framesize) {
 705                 /* That was the last chunk in this frame. Send the buffered
 706                  * pre-trigger samples out now, in one big chunk. */
 707                 sr_dbg("End of frame, sending %d pre-trigger buffered samples.",
 708                        devc->samp_buffered);
 709                 send_chunk(devc, devc->framebuf, devc->samp_buffered);
 710
 711                 /* Mark the end of this frame. */
 712                 packet.type = SR_DF_FRAME_END;
 713                 sr_session_send(devc->cb_data, &packet);
 714
 715                 if (devc->limit_frames && ++devc->num_frames == devc->limit_frames) {
 716                         /* Terminate session */
 717                         devc->dev_state = STOPPING;
 718                 } else {
 719                         devc->dev_state = NEW_CAPTURE;
 720                 }
 721         }
 722 }
 723
 724 static int handle_event(int fd, int revents, void *cb_data)
 725 {
 726         const struct sr_dev_inst *sdi;
 727         struct sr_datafeed_packet packet;
 728         struct timeval tv;
 729         struct dev_context *devc;
 730         struct drv_context *drvc = di->priv;
 731         const struct libusb_pollfd **lupfd;
 732         int num_probes, i;
 733         uint32_t trigger_offset;
 734         uint8_t capturestate;
 735
 736         (void)fd;
 737         (void)revents;
 738
 739         sdi = cb_data;
 740         devc = sdi->priv;
 741         if (devc->dev_state == STOPPING) {
 742                 /* We've been told to wind up the acquisition. */
 743                 sr_dbg("Stopping acquisition.");
 744                 /*
 745                  * TODO: Doesn't really cancel pending transfers so they might
 746                  * come in after SR_DF_END is sent.
 747                  */
 748                 lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 749                 for (i = 0; lupfd[i]; i++)
 750                         sr_source_remove(lupfd[i]->fd);
 751                 free(lupfd);
 752
 753                 packet.type = SR_DF_END;
 754                 sr_session_send(sdi, &packet);
 755
 756                 devc->dev_state = IDLE;
 757
 758                 return TRUE;
 759         }
 760
 761         /* Always handle pending libusb events. */
 762         tv.tv_sec = tv.tv_usec = 0;
 763         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 764
 765         /* TODO: ugh */
 766         if (devc->dev_state == NEW_CAPTURE) {
 767                 if (dso_capture_start(devc) != SR_OK)
 768                         return TRUE;
 769                 if (dso_enable_trigger(devc) != SR_OK)
 770                         return TRUE;
 771 //              if (dso_force_trigger(devc) != SR_OK)
 772 //                      return TRUE;
 773                 sr_dbg("Successfully requested next chunk.");
 774                 devc->dev_state = CAPTURE;
 775                 return TRUE;
 776         }
 777         if (devc->dev_state != CAPTURE)
 778                 return TRUE;
 779
 780         if ((dso_get_capturestate(devc, &capturestate, &trigger_offset)) != SR_OK)
 781                 return TRUE;
 782
 783         sr_dbg("Capturestate %d.", capturestate);
 784         sr_dbg("Trigger offset 0x%.6x.", trigger_offset);
 785         switch (capturestate) {
 786         case CAPTURE_EMPTY:
 787                 if (++devc->capture_empty_count >= MAX_CAPTURE_EMPTY) {
 788                         devc->capture_empty_count = 0;
 789                         if (dso_capture_start(devc) != SR_OK)
 790                                 break;
 791                         if (dso_enable_trigger(devc) != SR_OK)
 792                                 break;
 793 //                      if (dso_force_trigger(devc) != SR_OK)
 794 //                              break;
 795                         sr_dbg("Successfully requested next chunk.");
 796                 }
 797                 break;
 798         case CAPTURE_FILLING:
 799                 /* No data yet. */
 800                 break;
 801         case CAPTURE_READY_8BIT:
 802                 /* Remember where in the captured frame the trigger is. */
 803                 devc->trigger_offset = trigger_offset;
 804
 805                 num_probes = (devc->ch1_enabled && devc->ch2_enabled) ? 2 : 1;
 806                 /* TODO: Check malloc return value. */
 807                 devc->framebuf = g_try_malloc(devc->framesize * num_probes * 2);
 808                 devc->samp_buffered = devc->samp_received = 0;
 809
 810                 /* Tell the scope to send us the first frame. */
 811                 if (dso_get_channeldata(devc, receive_transfer) != SR_OK)
 812                         break;
 813
 814                 /*
 815                  * Don't hit the state machine again until we're done fetching
 816                  * the data we just told the scope to send.
 817                  */
 818                 devc->dev_state = FETCH_DATA;
 819
 820                 /* Tell the frontend a new frame is on the way. */
 821                 packet.type = SR_DF_FRAME_BEGIN;
 822                 sr_session_send(sdi, &packet);
 823                 break;
 824         case CAPTURE_READY_9BIT:
 825                 /* TODO */
 826                 sr_err("Not yet supported.");
 827                 break;
 828         case CAPTURE_TIMEOUT:
 829                 /* Doesn't matter, we'll try again next time. */
 830                 break;
 831         default:
 832                 sr_dbg("Unknown capture state: %d.", capturestate);
 833                 break;
 834         }
 835
 836         return TRUE;
 837 }
 838
 839 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
 840                                     void *cb_data)
 841 {
 842         const struct libusb_pollfd **lupfd;
 843         struct sr_datafeed_packet packet;
 844         struct sr_datafeed_header header;
 845         struct dev_context *devc;
 846         struct drv_context *drvc = di->priv;
 847         int i;
 848
 849         if (sdi->status != SR_ST_ACTIVE)
 850                 return SR_ERR;
 851
 852         devc = sdi->priv;
 853         devc->cb_data = cb_data;
 854
 855         if (configure_probes(sdi) != SR_OK) {
 856                 sr_err("Failed to configure probes.");
 857                 return SR_ERR;
 858         }
 859
 860         if (dso_init(devc) != SR_OK)
 861                 return SR_ERR;
 862
 863         if (dso_capture_start(devc) != SR_OK)
 864                 return SR_ERR;
 865
 866         devc->dev_state = CAPTURE;
 867         lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 868         for (i = 0; lupfd[i]; i++)
 869                 sr_source_add(lupfd[i]->fd, lupfd[i]->events, TICK,
 870                               handle_event, (void *)sdi);
 871         free(lupfd);
 872
 873         /* Send header packet to the session bus. */
 874         packet.type = SR_DF_HEADER;
 875         packet.payload = (unsigned char *)&header;
 876         header.feed_version = 1;
 877         gettimeofday(&header.starttime, NULL);
 878         sr_session_send(cb_data, &packet);
 879
 880         return SR_OK;
 881 }
 882
 883 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 884 {
 885         struct dev_context *devc;
 886
 887         (void)cb_data;
 888
 889         if (sdi->status != SR_ST_ACTIVE)
 890                 return SR_ERR;
 891
 892         devc = sdi->priv;
 893         devc->dev_state = STOPPING;
 894
 895         return SR_OK;
 896 }
 897
 898 SR_PRIV struct sr_dev_driver hantek_dso_driver_info = {
 899         .name = "hantek-dso",
 900         .longname = "Hantek DSO",
 901         .api_version = 1,
 902         .init = hw_init,
 903         .cleanup = hw_cleanup,
 904         .scan = hw_scan,
 905         .dev_list = hw_dev_list,
 906         .dev_clear = clear_instances,
 907         .dev_open = hw_dev_open,
 908         .dev_close = hw_dev_close,
 909         .info_get = hw_info_get,
 910         .dev_config_set = hw_dev_config_set,
 911         .dev_acquisition_start = hw_dev_acquisition_start,
 912         .dev_acquisition_stop = hw_dev_acquisition_stop,
 913         .priv = NULL,
 914 };