src/hardware/hantek-dso/api.c

   1 /*
   2  * This file is part of the libsigrok 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 <config.h>
  21 #include <math.h>
  22 #include <stdio.h>
  23 #include <stdint.h>
  24 #include <stdlib.h>
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #include <fcntl.h>
  28 #include <unistd.h>
  29 #include <string.h>
  30 #include <sys/time.h>
  31 #include <inttypes.h>
  32 #include <glib.h>
  33 #include <libusb.h>
  34 #include <libsigrok/libsigrok.h>
  35 #include "libsigrok-internal.h"
  36 #include "protocol.h"
  37
  38 /* Max time in ms before we want to check on USB events */
  39 /* TODO tune this properly */
  40 #define TICK 1
  41
  42 #define NUM_TIMEBASE 10
  43 #define NUM_VDIV     8
  44
  45 #define NUM_BUFFER_SIZES 2
  46
  47 static const uint32_t scanopts[] = {
  48         SR_CONF_CONN,
  49 };
  50
  51 static const uint32_t drvopts[] = {
  52         SR_CONF_OSCILLOSCOPE,
  53 };
  54
  55 static const uint32_t devopts[] = {
  56         SR_CONF_CONTINUOUS,
  57         SR_CONF_CONN | SR_CONF_GET,
  58         SR_CONF_LIMIT_FRAMES | SR_CONF_SET,
  59         SR_CONF_TIMEBASE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  60         SR_CONF_NUM_HDIV | SR_CONF_GET,
  61         SR_CONF_HORIZ_TRIGGERPOS | SR_CONF_GET | SR_CONF_SET,
  62         SR_CONF_TRIGGER_SOURCE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  63         SR_CONF_TRIGGER_SLOPE | SR_CONF_GET | SR_CONF_SET,
  64         SR_CONF_BUFFERSIZE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  65         SR_CONF_NUM_VDIV | SR_CONF_GET,
  66 };
  67
  68 static const uint32_t devopts_cg[] = {
  69         SR_CONF_VDIV | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  70         SR_CONF_COUPLING | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  71         SR_CONF_FILTER | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  72 };
  73
  74 static const char *channel_names[] = {
  75         "CH1", "CH2",
  76 };
  77
  78 static const uint64_t buffersizes_32k[] = {
  79         (10 * 1024), (32 * 1024),
  80 };
  81 static const uint64_t buffersizes_512k[] = {
  82         (10 * 1024), (512 * 1024),
  83 };
  84 static const uint64_t buffersizes_14k[] = {
  85         (10 * 1024), (14 * 1024),
  86 };
  87
  88 static const struct dso_profile dev_profiles[] = {
  89         {       0x04b4, 0x2090, 0x04b5, 0x2090,
  90                 "Hantek", "DSO-2090",
  91                 buffersizes_32k,
  92                 "hantek-dso-2090.fw" },
  93         {       0x04b4, 0x2150, 0x04b5, 0x2150,
  94                 "Hantek", "DSO-2150",
  95                 buffersizes_32k,
  96                 "hantek-dso-2150.fw" },
  97         {       0x04b4, 0x2250, 0x04b5, 0x2250,
  98                 "Hantek", "DSO-2250",
  99                 buffersizes_512k,
 100                 "hantek-dso-2250.fw" },
 101         {       0x04b4, 0x5200, 0x04b5, 0x5200,
 102                 "Hantek", "DSO-5200",
 103                 buffersizes_14k,
 104                 "hantek-dso-5200.fw" },
 105         {       0x04b4, 0x520a, 0x04b5, 0x520a,
 106                 "Hantek", "DSO-5200A",
 107                 buffersizes_512k,
 108                 "hantek-dso-5200A.fw" },
 109         ALL_ZERO
 110 };
 111
 112 static const uint64_t timebases[][2] = {
 113         /* microseconds */
 114         { 10, 1000000 },
 115         { 20, 1000000 },
 116         { 40, 1000000 },
 117         { 100, 1000000 },
 118         { 200, 1000000 },
 119         { 400, 1000000 },
 120         /* milliseconds */
 121         { 1, 1000 },
 122         { 2, 1000 },
 123         { 4, 1000 },
 124         { 10, 1000 },
 125         { 20, 1000 },
 126         { 40, 1000 },
 127         { 100, 1000 },
 128         { 200, 1000 },
 129         { 400, 1000 },
 130 };
 131
 132 static const uint64_t vdivs[][2] = {
 133         /* millivolts */
 134         { 10, 1000 },
 135         { 20, 1000 },
 136         { 50, 1000 },
 137         { 100, 1000 },
 138         { 200, 1000 },
 139         { 500, 1000 },
 140         /* volts */
 141         { 1, 1 },
 142         { 2, 1 },
 143         { 5, 1 },
 144 };
 145
 146 static const char *trigger_sources[] = {
 147         "CH1", "CH2", "EXT",
 148         /* TODO: forced */
 149 };
 150
 151 static const char *trigger_slopes[] = {
 152         "r", "f",
 153 };
 154
 155 static const char *coupling[] = {
 156         "AC", "DC", "GND",
 157 };
 158
 159 static struct sr_dev_inst *dso_dev_new(const struct dso_profile *prof)
 160 {
 161         struct sr_dev_inst *sdi;
 162         struct sr_channel *ch;
 163         struct sr_channel_group *cg;
 164         struct dev_context *devc;
 165         unsigned int i;
 166
 167         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 168         sdi->status = SR_ST_INITIALIZING;
 169         sdi->vendor = g_strdup(prof->vendor);
 170         sdi->model = g_strdup(prof->model);
 171
 172         /*
 173          * Add only the real channels -- EXT isn't a source of data, only
 174          * a trigger source internal to the device.
 175          */
 176         for (i = 0; i < ARRAY_SIZE(channel_names); i++) {
 177                 ch = sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE, channel_names[i]);
 178                 cg = g_malloc0(sizeof(struct sr_channel_group));
 179                 cg->name = g_strdup(channel_names[i]);
 180                 cg->channels = g_slist_append(cg->channels, ch);
 181                 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 182         }
 183
 184         devc = g_malloc0(sizeof(struct dev_context));
 185         devc->profile = prof;
 186         devc->dev_state = IDLE;
 187         devc->timebase = DEFAULT_TIMEBASE;
 188         devc->ch_enabled[0] = TRUE;
 189         devc->ch_enabled[1] = TRUE;
 190         devc->voltage[0] = DEFAULT_VOLTAGE;
 191         devc->voltage[1] = DEFAULT_VOLTAGE;
 192         devc->coupling[0] = DEFAULT_COUPLING;
 193         devc->coupling[1] = DEFAULT_COUPLING;
 194         devc->voffset_ch1 = DEFAULT_VERT_OFFSET;
 195         devc->voffset_ch2 = DEFAULT_VERT_OFFSET;
 196         devc->voffset_trigger = DEFAULT_VERT_TRIGGERPOS;
 197         devc->framesize = DEFAULT_FRAMESIZE;
 198         devc->triggerslope = SLOPE_POSITIVE;
 199         devc->triggersource = g_strdup(DEFAULT_TRIGGER_SOURCE);
 200         devc->triggerposition = DEFAULT_HORIZ_TRIGGERPOS;
 201         sdi->priv = devc;
 202
 203         return sdi;
 204 }
 205
 206 static int configure_channels(const struct sr_dev_inst *sdi)
 207 {
 208         struct dev_context *devc;
 209         struct sr_channel *ch;
 210         const GSList *l;
 211         int p;
 212
 213         devc = sdi->priv;
 214
 215         g_slist_free(devc->enabled_channels);
 216         devc->ch_enabled[0] = devc->ch_enabled[1] = FALSE;
 217         for (l = sdi->channels, p = 0; l; l = l->next, p++) {
 218                 ch = l->data;
 219                 if (p == 0)
 220                         devc->ch_enabled[0] = ch->enabled;
 221                 else
 222                         devc->ch_enabled[1] = ch->enabled;
 223                 if (ch->enabled)
 224                         devc->enabled_channels = g_slist_append(devc->enabled_channels, ch);
 225         }
 226
 227         return SR_OK;
 228 }
 229
 230 static void clear_helper(struct dev_context *devc)
 231 {
 232         g_free(devc->triggersource);
 233         g_slist_free(devc->enabled_channels);
 234 }
 235
 236 static int dev_clear(const struct sr_dev_driver *di)
 237 {
 238         return std_dev_clear_with_callback(di, (std_dev_clear_callback)clear_helper);
 239 }
 240
 241 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 242 {
 243         struct drv_context *drvc;
 244         struct dev_context *devc;
 245         struct sr_dev_inst *sdi;
 246         struct sr_usb_dev_inst *usb;
 247         struct sr_config *src;
 248         const struct dso_profile *prof;
 249         GSList *l, *devices, *conn_devices;
 250         struct libusb_device_descriptor des;
 251         libusb_device **devlist;
 252         int i, j;
 253         const char *conn;
 254         char connection_id[64];
 255
 256         drvc = di->context;
 257
 258         devices = 0;
 259
 260         conn = NULL;
 261         for (l = options; l; l = l->next) {
 262                 src = l->data;
 263                 if (src->key == SR_CONF_CONN) {
 264                         conn = g_variant_get_string(src->data, NULL);
 265                         break;
 266                 }
 267         }
 268         if (conn)
 269                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 270         else
 271                 conn_devices = NULL;
 272
 273         /* Find all Hantek DSO devices and upload firmware to all of them. */
 274         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 275         for (i = 0; devlist[i]; i++) {
 276                 if (conn) {
 277                         usb = NULL;
 278                         for (l = conn_devices; l; l = l->next) {
 279                                 usb = l->data;
 280                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 281                                         && usb->address == libusb_get_device_address(devlist[i]))
 282                                         break;
 283                         }
 284                         if (!l)
 285                                 /* This device matched none of the ones that
 286                                  * matched the conn specification. */
 287                                 continue;
 288                 }
 289
 290                 libusb_get_device_descriptor(devlist[i], &des);
 291
 292                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 293
 294                 prof = NULL;
 295                 for (j = 0; dev_profiles[j].orig_vid; j++) {
 296                         if (des.idVendor == dev_profiles[j].orig_vid
 297                                 && des.idProduct == dev_profiles[j].orig_pid) {
 298                                 /* Device matches the pre-firmware profile. */
 299                                 prof = &dev_profiles[j];
 300                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 301                                 sdi = dso_dev_new(prof);
 302                                 sdi->connection_id = g_strdup(connection_id);
 303                                 devices = g_slist_append(devices, sdi);
 304                                 devc = sdi->priv;
 305                                 if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 306                                                 USB_CONFIGURATION, prof->firmware) == SR_OK)
 307                                         /* Remember when the firmware on this device was updated */
 308                                         devc->fw_updated = g_get_monotonic_time();
 309                                 else
 310                                         sr_err("Firmware upload failed");
 311                                 /* Dummy USB address of 0xff will get overwritten later. */
 312                                 sdi->conn = sr_usb_dev_inst_new(
 313                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 314                                 break;
 315                         } else if (des.idVendor == dev_profiles[j].fw_vid
 316                                 && des.idProduct == dev_profiles[j].fw_pid) {
 317                                 /* Device matches the post-firmware profile. */
 318                                 prof = &dev_profiles[j];
 319                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 320                                 sdi = dso_dev_new(prof);
 321                                 sdi->connection_id = g_strdup(connection_id);
 322                                 sdi->status = SR_ST_INACTIVE;
 323                                 devices = g_slist_append(devices, sdi);
 324                                 sdi->inst_type = SR_INST_USB;
 325                                 sdi->conn = sr_usb_dev_inst_new(
 326                                                 libusb_get_bus_number(devlist[i]),
 327                                                 libusb_get_device_address(devlist[i]), NULL);
 328                                 break;
 329                         }
 330                 }
 331                 if (!prof)
 332                         /* not a supported VID/PID */
 333                         continue;
 334         }
 335         libusb_free_device_list(devlist, 1);
 336
 337         return std_scan_complete(di, devices);
 338 }
 339
 340 static int dev_open(struct sr_dev_inst *sdi)
 341 {
 342         struct dev_context *devc;
 343         struct sr_usb_dev_inst *usb;
 344         int64_t timediff_us, timediff_ms;
 345         int err;
 346
 347         devc = sdi->priv;
 348         usb = sdi->conn;
 349
 350         /*
 351          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 352          * for the FX2 to renumerate.
 353          */
 354         err = SR_ERR;
 355         if (devc->fw_updated > 0) {
 356                 sr_info("Waiting for device to reset.");
 357                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 358                 g_usleep(300 * 1000);
 359                 timediff_ms = 0;
 360                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 361                         if ((err = dso_open(sdi)) == SR_OK)
 362                                 break;
 363                         g_usleep(100 * 1000);
 364                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 365                         timediff_ms = timediff_us / 1000;
 366                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 367                 }
 368                 sr_info("Device came back after %" PRIi64 " ms.", timediff_ms);
 369         } else {
 370                 err = dso_open(sdi);
 371         }
 372
 373         if (err != SR_OK) {
 374                 sr_err("Unable to open device.");
 375                 return SR_ERR;
 376         }
 377
 378         err = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 379         if (err != 0) {
 380                 sr_err("Unable to claim interface: %s.",
 381                         libusb_error_name(err));
 382                 return SR_ERR;
 383         }
 384
 385         return SR_OK;
 386 }
 387
 388 static int dev_close(struct sr_dev_inst *sdi)
 389 {
 390         dso_close(sdi);
 391
 392         return SR_OK;
 393 }
 394
 395 static int config_get(uint32_t key, GVariant **data,
 396         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 397 {
 398         struct dev_context *devc;
 399         struct sr_usb_dev_inst *usb;
 400         const char *s;
 401         const uint64_t *vdiv;
 402         int ch_idx;
 403
 404         switch (key) {
 405         case SR_CONF_NUM_HDIV:
 406                 *data = g_variant_new_int32(NUM_TIMEBASE);
 407                 break;
 408         case SR_CONF_NUM_VDIV:
 409                 *data = g_variant_new_int32(NUM_VDIV);
 410                 break;
 411         }
 412
 413         if (!sdi)
 414                 return SR_ERR_ARG;
 415
 416         devc = sdi->priv;
 417         if (!cg) {
 418                 switch (key) {
 419                 case SR_CONF_CONN:
 420                         if (!sdi->conn)
 421                                 return SR_ERR_ARG;
 422                         usb = sdi->conn;
 423                         if (usb->address == 255)
 424                                 /* Device still needs to re-enumerate after firmware
 425                                  * upload, so we don't know its (future) address. */
 426                                 return SR_ERR;
 427                         *data = g_variant_new_printf("%d.%d", usb->bus, usb->address);
 428                         break;
 429                 case SR_CONF_TIMEBASE:
 430                         *data = g_variant_new("(tt)", timebases[devc->timebase][0],
 431                                         timebases[devc->timebase][1]);
 432                         break;
 433                 case SR_CONF_BUFFERSIZE:
 434                         *data = g_variant_new_uint64(devc->framesize);
 435                         break;
 436                 case SR_CONF_TRIGGER_SOURCE:
 437                         *data = g_variant_new_string(devc->triggersource);
 438                         break;
 439                 case SR_CONF_TRIGGER_SLOPE:
 440                         s = (devc->triggerslope == SLOPE_POSITIVE) ? "r" : "f";
 441                         *data = g_variant_new_string(s);
 442                         break;
 443                 case SR_CONF_HORIZ_TRIGGERPOS:
 444                         *data = g_variant_new_double(devc->triggerposition);
 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_FILTER:
 458                         *data = g_variant_new_boolean(devc->filter[ch_idx]);
 459                         break;
 460                 case SR_CONF_VDIV:
 461                         vdiv = vdivs[devc->voltage[ch_idx]];
 462                         *data = g_variant_new("(tt)", vdiv[0], vdiv[1]);
 463                         break;
 464                 case SR_CONF_COUPLING:
 465                         *data = g_variant_new_string(coupling[devc->coupling[ch_idx]]);
 466                         break;
 467                 }
 468         }
 469
 470         return SR_OK;
 471 }
 472
 473 static int config_set(uint32_t key, GVariant *data,
 474         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 475 {
 476         struct dev_context *devc;
 477         double tmp_double;
 478         uint64_t tmp_u64, p, q;
 479         int tmp_int, ch_idx;
 480         unsigned int i;
 481         const char *tmp_str;
 482
 483         devc = sdi->priv;
 484         if (!cg) {
 485                 switch (key) {
 486                 case SR_CONF_LIMIT_FRAMES:
 487                         devc->limit_frames = g_variant_get_uint64(data);
 488                         break;
 489                 case SR_CONF_TRIGGER_SLOPE:
 490                         tmp_str = g_variant_get_string(data, NULL);
 491                         if (!tmp_str || !(tmp_str[0] == 'f' || tmp_str[0] == 'r'))
 492                                 return SR_ERR_ARG;
 493                         devc->triggerslope = (tmp_str[0] == 'r')
 494                                 ? SLOPE_POSITIVE : SLOPE_NEGATIVE;
 495                         break;
 496                 case SR_CONF_HORIZ_TRIGGERPOS:
 497                         tmp_double = g_variant_get_double(data);
 498                         if (tmp_double < 0.0 || tmp_double > 1.0) {
 499                                 sr_err("Trigger position should be between 0.0 and 1.0.");
 500                                 return SR_ERR_ARG;
 501                         } else
 502                                 devc->triggerposition = tmp_double;
 503                         break;
 504                 case SR_CONF_BUFFERSIZE:
 505                         tmp_u64 = g_variant_get_uint64(data);
 506                         for (i = 0; i < NUM_BUFFER_SIZES; i++) {
 507                                 if (devc->profile->buffersizes[i] == tmp_u64) {
 508                                         devc->framesize = tmp_u64;
 509                                         break;
 510                                 }
 511                         }
 512                         if (i == NUM_BUFFER_SIZES)
 513                                 return SR_ERR_ARG;
 514                         break;
 515                 case SR_CONF_TIMEBASE:
 516                         g_variant_get(data, "(tt)", &p, &q);
 517                         tmp_int = -1;
 518                         for (i = 0; i < ARRAY_SIZE(timebases); i++) {
 519                                 if (timebases[i][0] == p && timebases[i][1] == q) {
 520                                         tmp_int = i;
 521                                         break;
 522                                 }
 523                         }
 524                         if (tmp_int >= 0)
 525                                 devc->timebase = tmp_int;
 526                         else
 527                                 return SR_ERR_ARG;
 528                         break;
 529                 case SR_CONF_TRIGGER_SOURCE:
 530                         tmp_str = g_variant_get_string(data, NULL);
 531                         for (i = 0; trigger_sources[i]; i++) {
 532                                 if (!strcmp(tmp_str, trigger_sources[i])) {
 533                                         devc->triggersource = g_strdup(tmp_str);
 534                                         break;
 535                                 }
 536                         }
 537                         if (trigger_sources[i] == 0)
 538                                 return SR_ERR_ARG;
 539                         break;
 540                 default:
 541                         return SR_ERR_NA;
 542                 }
 543         } else {
 544                 if (sdi->channel_groups->data == cg)
 545                         ch_idx = 0;
 546                 else if (sdi->channel_groups->next->data == cg)
 547                         ch_idx = 1;
 548                 else
 549                         return SR_ERR_ARG;
 550                 switch (key) {
 551                 case SR_CONF_FILTER:
 552                         devc->filter[ch_idx] = g_variant_get_boolean(data);
 553                         break;
 554                 case SR_CONF_VDIV:
 555                         g_variant_get(data, "(tt)", &p, &q);
 556                         tmp_int = -1;
 557                         for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 558                                 if (vdivs[i][0] == p && vdivs[i][1] == q) {
 559                                         tmp_int = i;
 560                                         break;
 561                                 }
 562                         }
 563                         if (tmp_int >= 0) {
 564                                 devc->voltage[ch_idx] = tmp_int;
 565                         } else
 566                                 return SR_ERR_ARG;
 567                         break;
 568                 case SR_CONF_COUPLING:
 569                         tmp_str = g_variant_get_string(data, NULL);
 570                         for (i = 0; coupling[i]; i++) {
 571                                 if (!strcmp(tmp_str, coupling[i])) {
 572                                         devc->coupling[ch_idx] = i;
 573                                         break;
 574                                 }
 575                         }
 576                         if (coupling[i] == 0)
 577                                 return SR_ERR_ARG;
 578                         break;
 579                 default:
 580                         return SR_ERR_NA;
 581                 }
 582         }
 583
 584         return SR_OK;
 585 }
 586
 587 static int config_list(uint32_t key, GVariant **data,
 588         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 589 {
 590         struct dev_context *devc;
 591
 592         if (!cg) {
 593                 switch (key) {
 594                 case SR_CONF_SCAN_OPTIONS:
 595                 case SR_CONF_DEVICE_OPTIONS:
 596                         return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
 597                 case SR_CONF_BUFFERSIZE:
 598                         if (!sdi)
 599                                 return SR_ERR_ARG;
 600                         devc = sdi->priv;
 601                         *data = std_gvar_array_u64(devc->profile->buffersizes, NUM_BUFFER_SIZES);
 602                         break;
 603                 case SR_CONF_TIMEBASE:
 604                         *data = std_gvar_tuple_array(ARRAY_AND_SIZE(timebases));
 605                         break;
 606                 case SR_CONF_TRIGGER_SOURCE:
 607                         *data = g_variant_new_strv(ARRAY_AND_SIZE(trigger_sources));
 608                         break;
 609                 case SR_CONF_TRIGGER_SLOPE:
 610                         *data = g_variant_new_strv(ARRAY_AND_SIZE(trigger_slopes));
 611                         break;
 612                 default:
 613                         return SR_ERR_NA;
 614                 }
 615         } else {
 616                 switch (key) {
 617                 case SR_CONF_DEVICE_OPTIONS:
 618                         *data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg));
 619                         break;
 620                 case SR_CONF_COUPLING:
 621                         *data = g_variant_new_strv(ARRAY_AND_SIZE(coupling));
 622                         break;
 623                 case SR_CONF_VDIV:
 624                         *data = std_gvar_tuple_array(ARRAY_AND_SIZE(vdivs));
 625                         break;
 626                 default:
 627                         return SR_ERR_NA;
 628                 }
 629         }
 630
 631         return SR_OK;
 632 }
 633
 634 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 635                 int num_samples)
 636 {
 637         struct sr_datafeed_packet packet;
 638         struct sr_datafeed_analog analog;
 639         struct sr_analog_encoding encoding;
 640         struct sr_analog_meaning meaning;
 641         struct sr_analog_spec spec;
 642         struct dev_context *devc = sdi->priv;
 643         GSList *channels = devc->enabled_channels;
 644
 645         packet.type = SR_DF_ANALOG;
 646         packet.payload = &analog;
 647         /* TODO: support for 5xxx series 9-bit samples */
 648         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
 649         analog.num_samples = num_samples;
 650         analog.meaning->mq = SR_MQ_VOLTAGE;
 651         analog.meaning->unit = SR_UNIT_VOLT;
 652         analog.meaning->mqflags = 0;
 653         /* TODO: Check malloc return value. */
 654         analog.data = g_try_malloc(num_samples * sizeof(float));
 655
 656         for (int ch = 0; ch < 2; ch++) {
 657                 if (!devc->ch_enabled[ch])
 658                         continue;
 659
 660                 float range = ((float)vdivs[devc->voltage[ch]][0] / vdivs[devc->voltage[ch]][1]) * 8;
 661                 float vdivlog = log10f(range / 255);
 662                 int digits = -(int)vdivlog + (vdivlog < 0.0);
 663                 analog.encoding->digits = digits;
 664                 analog.spec->spec_digits = digits;
 665                 analog.meaning->channels = g_slist_append(NULL, channels->data);
 666
 667                 for (int i = 0; i < num_samples; i++) {
 668                         /*
 669                          * The device always sends data for both channels. If a channel
 670                          * is disabled, it contains a copy of the enabled channel's
 671                          * data. However, we only send the requested channels to
 672                          * the bus.
 673                          *
 674                          * Voltage values are encoded as a value 0-255 (0-512 on the
 675                          * DSO-5200*), where the value is a point in the range
 676                          * represented by the vdiv setting. There are 8 vertical divs,
 677                          * so e.g. 500mV/div represents 4V peak-to-peak where 0 = -2V
 678                          * and 255 = +2V.
 679                          */
 680                         /* TODO: Support for DSO-5xxx series 9-bit samples. */
 681                         ((float *)analog.data)[i] = range / 255 * *(buf + i * 2 + 1 - ch) - range / 2;
 682                 }
 683                 sr_session_send(sdi, &packet);
 684                 g_slist_free(analog.meaning->channels);
 685
 686                 channels = channels->next;
 687         }
 688         g_free(analog.data);
 689 }
 690
 691 /*
 692  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 693  * Only channel data comes in asynchronously, and all transfers for this are
 694  * queued up beforehand, so this just needs to chuck the incoming data onto
 695  * the libsigrok session bus.
 696  */
 697 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 698 {
 699         struct sr_datafeed_packet packet;
 700         struct sr_dev_inst *sdi;
 701         struct dev_context *devc;
 702         int num_samples, pre;
 703
 704         sdi = transfer->user_data;
 705         devc = sdi->priv;
 706         sr_spew("receive_transfer(): status %s received %d bytes.",
 707                 libusb_error_name(transfer->status), transfer->actual_length);
 708
 709         if (transfer->actual_length == 0)
 710                 /* Nothing to send to the bus. */
 711                 return;
 712
 713         num_samples = transfer->actual_length / 2;
 714
 715         sr_spew("Got %d-%d/%d samples in frame.", devc->samp_received + 1,
 716                 devc->samp_received + num_samples, devc->framesize);
 717
 718         /*
 719          * The device always sends a full frame, but the beginning of the frame
 720          * doesn't represent the trigger point. The offset at which the trigger
 721          * happened came in with the capture state, so we need to start sending
 722          * from there up the session bus. The samples in the frame buffer
 723          * before that trigger point came after the end of the device's frame
 724          * buffer was reached, and it wrapped around to overwrite up until the
 725          * trigger point.
 726          */
 727         if (devc->samp_received < devc->trigger_offset) {
 728                 /* Trigger point not yet reached. */
 729                 if (devc->samp_received + num_samples < devc->trigger_offset) {
 730                         /* The entire chunk is before the trigger point. */
 731                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 732                                         transfer->buffer, num_samples * 2);
 733                         devc->samp_buffered += num_samples;
 734                 } else {
 735                         /*
 736                          * This chunk hits or overruns the trigger point.
 737                          * Store the part before the trigger fired, and
 738                          * send the rest up to the session bus.
 739                          */
 740                         pre = devc->trigger_offset - devc->samp_received;
 741                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 742                                         transfer->buffer, pre * 2);
 743                         devc->samp_buffered += pre;
 744
 745                         /* The rest of this chunk starts with the trigger point. */
 746                         sr_dbg("Reached trigger point, %d samples buffered.",
 747                                 devc->samp_buffered);
 748
 749                         /* Avoid the corner case where the chunk ended at
 750                          * exactly the trigger point. */
 751                         if (num_samples > pre)
 752                                 send_chunk(sdi, transfer->buffer + pre * 2,
 753                                                 num_samples - pre);
 754                 }
 755         } else {
 756                 /* Already past the trigger point, just send it all out. */
 757                 send_chunk(sdi, transfer->buffer, num_samples);
 758         }
 759
 760         devc->samp_received += num_samples;
 761
 762         /* Everything in this transfer was either copied to the buffer or
 763          * sent to the session bus. */
 764         g_free(transfer->buffer);
 765         libusb_free_transfer(transfer);
 766
 767         if (devc->samp_received >= devc->framesize) {
 768                 /* That was the last chunk in this frame. Send the buffered
 769                  * pre-trigger samples out now, in one big chunk. */
 770                 sr_dbg("End of frame, sending %d pre-trigger buffered samples.",
 771                         devc->samp_buffered);
 772                 send_chunk(sdi, devc->framebuf, devc->samp_buffered);
 773
 774                 /* Mark the end of this frame. */
 775                 packet.type = SR_DF_FRAME_END;
 776                 sr_session_send(sdi, &packet);
 777
 778                 if (devc->limit_frames && ++devc->num_frames == devc->limit_frames) {
 779                         /* Terminate session */
 780                         devc->dev_state = STOPPING;
 781                 } else {
 782                         devc->dev_state = NEW_CAPTURE;
 783                 }
 784         }
 785 }
 786
 787 static int handle_event(int fd, int revents, void *cb_data)
 788 {
 789         const struct sr_dev_inst *sdi;
 790         struct sr_datafeed_packet packet;
 791         struct timeval tv;
 792         struct sr_dev_driver *di;
 793         struct dev_context *devc;
 794         struct drv_context *drvc;
 795         int num_channels;
 796         uint32_t trigger_offset;
 797         uint8_t capturestate;
 798
 799         (void)fd;
 800         (void)revents;
 801
 802         sdi = cb_data;
 803         di = sdi->driver;
 804         drvc = di->context;
 805         devc = sdi->priv;
 806         if (devc->dev_state == STOPPING) {
 807                 /* We've been told to wind up the acquisition. */
 808                 sr_dbg("Stopping acquisition.");
 809                 /*
 810                  * TODO: Doesn't really cancel pending transfers so they might
 811                  * come in after SR_DF_END is sent.
 812                  */
 813                 usb_source_remove(sdi->session, drvc->sr_ctx);
 814
 815                 std_session_send_df_end(sdi);
 816
 817                 devc->dev_state = IDLE;
 818
 819                 return TRUE;
 820         }
 821
 822         /* Always handle pending libusb events. */
 823         tv.tv_sec = tv.tv_usec = 0;
 824         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 825
 826         /* TODO: ugh */
 827         if (devc->dev_state == NEW_CAPTURE) {
 828                 if (dso_capture_start(sdi) != SR_OK)
 829                         return TRUE;
 830                 if (dso_enable_trigger(sdi) != SR_OK)
 831                         return TRUE;
 832 //              if (dso_force_trigger(sdi) != SR_OK)
 833 //                      return TRUE;
 834                 sr_dbg("Successfully requested next chunk.");
 835                 devc->dev_state = CAPTURE;
 836                 return TRUE;
 837         }
 838         if (devc->dev_state != CAPTURE)
 839                 return TRUE;
 840
 841         if ((dso_get_capturestate(sdi, &capturestate, &trigger_offset)) != SR_OK)
 842                 return TRUE;
 843
 844         sr_dbg("Capturestate %d.", capturestate);
 845         sr_dbg("Trigger offset 0x%.6x.", trigger_offset);
 846         switch (capturestate) {
 847         case CAPTURE_EMPTY:
 848                 if (++devc->capture_empty_count >= MAX_CAPTURE_EMPTY) {
 849                         devc->capture_empty_count = 0;
 850                         if (dso_capture_start(sdi) != SR_OK)
 851                                 break;
 852                         if (dso_enable_trigger(sdi) != SR_OK)
 853                                 break;
 854 //                      if (dso_force_trigger(sdi) != SR_OK)
 855 //                              break;
 856                         sr_dbg("Successfully requested next chunk.");
 857                 }
 858                 break;
 859         case CAPTURE_FILLING:
 860                 /* No data yet. */
 861                 break;
 862         case CAPTURE_READY_8BIT:
 863                 /* Remember where in the captured frame the trigger is. */
 864                 devc->trigger_offset = trigger_offset;
 865
 866                 num_channels = (devc->ch_enabled[0] && devc->ch_enabled[1]) ? 2 : 1;
 867                 devc->framebuf = g_malloc(devc->framesize * num_channels * 2);
 868                 devc->samp_buffered = devc->samp_received = 0;
 869
 870                 /* Tell the scope to send us the first frame. */
 871                 if (dso_get_channeldata(sdi, receive_transfer) != SR_OK)
 872                         break;
 873
 874                 /*
 875                  * Don't hit the state machine again until we're done fetching
 876                  * the data we just told the scope to send.
 877                  */
 878                 devc->dev_state = FETCH_DATA;
 879
 880                 /* Tell the frontend a new frame is on the way. */
 881                 packet.type = SR_DF_FRAME_BEGIN;
 882                 sr_session_send(sdi, &packet);
 883                 break;
 884         case CAPTURE_READY_9BIT:
 885                 /* TODO */
 886                 sr_err("Not yet supported.");
 887                 break;
 888         case CAPTURE_TIMEOUT:
 889                 /* Doesn't matter, we'll try again next time. */
 890                 break;
 891         default:
 892                 sr_dbg("Unknown capture state: %d.", capturestate);
 893                 break;
 894         }
 895
 896         return TRUE;
 897 }
 898
 899 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 900 {
 901         struct dev_context *devc;
 902         struct sr_dev_driver *di = sdi->driver;
 903         struct drv_context *drvc = di->context;
 904
 905         devc = sdi->priv;
 906
 907         if (configure_channels(sdi) != SR_OK) {
 908                 sr_err("Failed to configure channels.");
 909                 return SR_ERR;
 910         }
 911
 912         if (dso_init(sdi) != SR_OK)
 913                 return SR_ERR;
 914
 915         if (dso_capture_start(sdi) != SR_OK)
 916                 return SR_ERR;
 917
 918         devc->dev_state = CAPTURE;
 919         usb_source_add(sdi->session, drvc->sr_ctx, TICK, handle_event, (void *)sdi);
 920
 921         std_session_send_df_header(sdi);
 922
 923         return SR_OK;
 924 }
 925
 926 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 927 {
 928         struct dev_context *devc;
 929
 930         devc = sdi->priv;
 931         devc->dev_state = STOPPING;
 932
 933         return SR_OK;
 934 }
 935
 936 static struct sr_dev_driver hantek_dso_driver_info = {
 937         .name = "hantek-dso",
 938         .longname = "Hantek DSO",
 939         .api_version = 1,
 940         .init = std_init,
 941         .cleanup = std_cleanup,
 942         .scan = scan,
 943         .dev_list = std_dev_list,
 944         .dev_clear = dev_clear,
 945         .config_get = config_get,
 946         .config_set = config_set,
 947         .config_list = config_list,
 948         .dev_open = dev_open,
 949         .dev_close = dev_close,
 950         .dev_acquisition_start = dev_acquisition_start,
 951         .dev_acquisition_stop = dev_acquisition_stop,
 952         .context = NULL,
 953 };
 954 SR_REGISTER_DEV_DRIVER(hantek_dso_driver_info);