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",
 148         "CH2",
 149         "EXT",
 150         /* TODO: forced */
 151 };
 152
 153 static const char *trigger_slopes[] = {
 154         "r",
 155         "f",
 156 };
 157
 158 static const char *coupling[] = {
 159         "AC",
 160         "DC",
 161         "GND",
 162 };
 163
 164 static struct sr_dev_inst *dso_dev_new(const struct dso_profile *prof)
 165 {
 166         struct sr_dev_inst *sdi;
 167         struct sr_channel *ch;
 168         struct sr_channel_group *cg;
 169         struct dev_context *devc;
 170         unsigned int i;
 171
 172         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 173         sdi->status = SR_ST_INITIALIZING;
 174         sdi->vendor = g_strdup(prof->vendor);
 175         sdi->model = g_strdup(prof->model);
 176
 177         /*
 178          * Add only the real channels -- EXT isn't a source of data, only
 179          * a trigger source internal to the device.
 180          */
 181         for (i = 0; i < ARRAY_SIZE(channel_names); i++) {
 182                 ch = sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE, channel_names[i]);
 183                 cg = g_malloc0(sizeof(struct sr_channel_group));
 184                 cg->name = g_strdup(channel_names[i]);
 185                 cg->channels = g_slist_append(cg->channels, ch);
 186                 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 187         }
 188
 189         devc = g_malloc0(sizeof(struct dev_context));
 190         devc->profile = prof;
 191         devc->dev_state = IDLE;
 192         devc->timebase = DEFAULT_TIMEBASE;
 193         devc->ch_enabled[0] = TRUE;
 194         devc->ch_enabled[1] = TRUE;
 195         devc->voltage[0] = DEFAULT_VOLTAGE;
 196         devc->voltage[1] = DEFAULT_VOLTAGE;
 197         devc->coupling[0] = DEFAULT_COUPLING;
 198         devc->coupling[1] = DEFAULT_COUPLING;
 199         devc->voffset_ch1 = DEFAULT_VERT_OFFSET;
 200         devc->voffset_ch2 = DEFAULT_VERT_OFFSET;
 201         devc->voffset_trigger = DEFAULT_VERT_TRIGGERPOS;
 202         devc->framesize = DEFAULT_FRAMESIZE;
 203         devc->triggerslope = SLOPE_POSITIVE;
 204         devc->triggersource = g_strdup(DEFAULT_TRIGGER_SOURCE);
 205         devc->triggerposition = DEFAULT_HORIZ_TRIGGERPOS;
 206         sdi->priv = devc;
 207
 208         return sdi;
 209 }
 210
 211 static int configure_channels(const struct sr_dev_inst *sdi)
 212 {
 213         struct dev_context *devc;
 214         struct sr_channel *ch;
 215         const GSList *l;
 216         int p;
 217
 218         devc = sdi->priv;
 219
 220         g_slist_free(devc->enabled_channels);
 221         devc->ch_enabled[0] = devc->ch_enabled[1] = FALSE;
 222         for (l = sdi->channels, p = 0; l; l = l->next, p++) {
 223                 ch = l->data;
 224                 if (p == 0)
 225                         devc->ch_enabled[0] = ch->enabled;
 226                 else
 227                         devc->ch_enabled[1] = ch->enabled;
 228                 if (ch->enabled)
 229                         devc->enabled_channels = g_slist_append(devc->enabled_channels, ch);
 230         }
 231
 232         return SR_OK;
 233 }
 234
 235 static void clear_helper(struct dev_context *devc)
 236 {
 237         g_free(devc->triggersource);
 238         g_slist_free(devc->enabled_channels);
 239 }
 240
 241 static int dev_clear(const struct sr_dev_driver *di)
 242 {
 243         return std_dev_clear_with_callback(di, (std_dev_clear_callback)clear_helper);
 244 }
 245
 246 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 247 {
 248         struct drv_context *drvc;
 249         struct dev_context *devc;
 250         struct sr_dev_inst *sdi;
 251         struct sr_usb_dev_inst *usb;
 252         struct sr_config *src;
 253         const struct dso_profile *prof;
 254         GSList *l, *devices, *conn_devices;
 255         struct libusb_device_descriptor des;
 256         libusb_device **devlist;
 257         int i, j;
 258         const char *conn;
 259         char connection_id[64];
 260
 261         drvc = di->context;
 262
 263         devices = 0;
 264
 265         conn = NULL;
 266         for (l = options; l; l = l->next) {
 267                 src = l->data;
 268                 if (src->key == SR_CONF_CONN) {
 269                         conn = g_variant_get_string(src->data, NULL);
 270                         break;
 271                 }
 272         }
 273         if (conn)
 274                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 275         else
 276                 conn_devices = NULL;
 277
 278         /* Find all Hantek DSO devices and upload firmware to all of them. */
 279         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 280         for (i = 0; devlist[i]; i++) {
 281                 if (conn) {
 282                         usb = NULL;
 283                         for (l = conn_devices; l; l = l->next) {
 284                                 usb = l->data;
 285                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 286                                         && usb->address == libusb_get_device_address(devlist[i]))
 287                                         break;
 288                         }
 289                         if (!l)
 290                                 /* This device matched none of the ones that
 291                                  * matched the conn specification. */
 292                                 continue;
 293                 }
 294
 295                 libusb_get_device_descriptor(devlist[i], &des);
 296
 297                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 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(prof);
 307                                 sdi->connection_id = g_strdup(connection_id);
 308                                 devices = g_slist_append(devices, sdi);
 309                                 devc = sdi->priv;
 310                                 if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 311                                                 USB_CONFIGURATION, prof->firmware) == SR_OK)
 312                                         /* Remember when the firmware on this device was updated */
 313                                         devc->fw_updated = g_get_monotonic_time();
 314                                 else
 315                                         sr_err("Firmware upload failed");
 316                                 /* Dummy USB address of 0xff will get overwritten later. */
 317                                 sdi->conn = sr_usb_dev_inst_new(
 318                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 319                                 break;
 320                         } else if (des.idVendor == dev_profiles[j].fw_vid
 321                                 && des.idProduct == dev_profiles[j].fw_pid) {
 322                                 /* Device matches the post-firmware profile. */
 323                                 prof = &dev_profiles[j];
 324                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 325                                 sdi = dso_dev_new(prof);
 326                                 sdi->connection_id = g_strdup(connection_id);
 327                                 sdi->status = SR_ST_INACTIVE;
 328                                 devices = g_slist_append(devices, sdi);
 329                                 sdi->inst_type = SR_INST_USB;
 330                                 sdi->conn = sr_usb_dev_inst_new(
 331                                                 libusb_get_bus_number(devlist[i]),
 332                                                 libusb_get_device_address(devlist[i]), NULL);
 333                                 break;
 334                         }
 335                 }
 336                 if (!prof)
 337                         /* not a supported VID/PID */
 338                         continue;
 339         }
 340         libusb_free_device_list(devlist, 1);
 341
 342         return std_scan_complete(di, devices);
 343 }
 344
 345 static int dev_open(struct sr_dev_inst *sdi)
 346 {
 347         struct dev_context *devc;
 348         struct sr_usb_dev_inst *usb;
 349         int64_t timediff_us, timediff_ms;
 350         int err;
 351
 352         devc = sdi->priv;
 353         usb = sdi->conn;
 354
 355         /*
 356          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 357          * for the FX2 to renumerate.
 358          */
 359         err = SR_ERR;
 360         if (devc->fw_updated > 0) {
 361                 sr_info("Waiting for device to reset.");
 362                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 363                 g_usleep(300 * 1000);
 364                 timediff_ms = 0;
 365                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 366                         if ((err = dso_open(sdi)) == SR_OK)
 367                                 break;
 368                         g_usleep(100 * 1000);
 369                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 370                         timediff_ms = timediff_us / 1000;
 371                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 372                 }
 373                 sr_info("Device came back after %" PRIi64 " ms.", timediff_ms);
 374         } else {
 375                 err = dso_open(sdi);
 376         }
 377
 378         if (err != SR_OK) {
 379                 sr_err("Unable to open device.");
 380                 return SR_ERR;
 381         }
 382
 383         err = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 384         if (err != 0) {
 385                 sr_err("Unable to claim interface: %s.",
 386                         libusb_error_name(err));
 387                 return SR_ERR;
 388         }
 389
 390         return SR_OK;
 391 }
 392
 393 static int dev_close(struct sr_dev_inst *sdi)
 394 {
 395         dso_close(sdi);
 396
 397         return SR_OK;
 398 }
 399
 400 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 401                 const struct sr_channel_group *cg)
 402 {
 403         struct dev_context *devc;
 404         struct sr_usb_dev_inst *usb;
 405         char str[128];
 406         const char *s;
 407         const uint64_t *vdiv;
 408         int ch_idx;
 409
 410         switch (key) {
 411         case SR_CONF_NUM_HDIV:
 412                 *data = g_variant_new_int32(NUM_TIMEBASE);
 413                 break;
 414         case SR_CONF_NUM_VDIV:
 415                 *data = g_variant_new_int32(NUM_VDIV);
 416                 break;
 417         }
 418
 419         if (!sdi)
 420                 return SR_ERR_ARG;
 421
 422         devc = sdi->priv;
 423         if (!cg) {
 424                 switch (key) {
 425                 case SR_CONF_CONN:
 426                         if (!sdi->conn)
 427                                 return SR_ERR_ARG;
 428                         usb = sdi->conn;
 429                         if (usb->address == 255)
 430                                 /* Device still needs to re-enumerate after firmware
 431                                  * upload, so we don't know its (future) address. */
 432                                 return SR_ERR;
 433                         snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 434                         *data = g_variant_new_string(str);
 435                         break;
 436                 case SR_CONF_TIMEBASE:
 437                         *data = g_variant_new("(tt)", timebases[devc->timebase][0],
 438                                         timebases[devc->timebase][1]);
 439                         break;
 440                 case SR_CONF_BUFFERSIZE:
 441                         *data = g_variant_new_uint64(devc->framesize);
 442                         break;
 443                 case SR_CONF_TRIGGER_SOURCE:
 444                         *data = g_variant_new_string(devc->triggersource);
 445                         break;
 446                 case SR_CONF_TRIGGER_SLOPE:
 447                         s = (devc->triggerslope == SLOPE_POSITIVE) ? "r" : "f";
 448                         *data = g_variant_new_string(s);
 449                         break;
 450                 case SR_CONF_HORIZ_TRIGGERPOS:
 451                         *data = g_variant_new_double(devc->triggerposition);
 452                         break;
 453                 default:
 454                         return SR_ERR_NA;
 455                 }
 456         } else {
 457                 if (sdi->channel_groups->data == cg)
 458                         ch_idx = 0;
 459                 else if (sdi->channel_groups->next->data == cg)
 460                         ch_idx = 1;
 461                 else
 462                         return SR_ERR_ARG;
 463                 switch (key) {
 464                 case SR_CONF_FILTER:
 465                         *data = g_variant_new_boolean(devc->filter[ch_idx]);
 466                         break;
 467                 case SR_CONF_VDIV:
 468                         vdiv = vdivs[devc->voltage[ch_idx]];
 469                         *data = g_variant_new("(tt)", vdiv[0], vdiv[1]);
 470                         break;
 471                 case SR_CONF_COUPLING:
 472                         *data = g_variant_new_string(coupling[devc->coupling[ch_idx]]);
 473                         break;
 474                 }
 475         }
 476
 477         return SR_OK;
 478 }
 479
 480 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 481                 const struct sr_channel_group *cg)
 482 {
 483         struct dev_context *devc;
 484         double tmp_double;
 485         uint64_t tmp_u64, p, q;
 486         int tmp_int, ch_idx;
 487         unsigned int i;
 488         const char *tmp_str;
 489
 490         devc = sdi->priv;
 491         if (!cg) {
 492                 switch (key) {
 493                 case SR_CONF_LIMIT_FRAMES:
 494                         devc->limit_frames = g_variant_get_uint64(data);
 495                         break;
 496                 case SR_CONF_TRIGGER_SLOPE:
 497                         tmp_str = g_variant_get_string(data, NULL);
 498                         if (!tmp_str || !(tmp_str[0] == 'f' || tmp_str[0] == 'r'))
 499                                 return SR_ERR_ARG;
 500                         devc->triggerslope = (tmp_str[0] == 'r')
 501                                 ? SLOPE_POSITIVE : SLOPE_NEGATIVE;
 502                         break;
 503                 case SR_CONF_HORIZ_TRIGGERPOS:
 504                         tmp_double = g_variant_get_double(data);
 505                         if (tmp_double < 0.0 || tmp_double > 1.0) {
 506                                 sr_err("Trigger position should be between 0.0 and 1.0.");
 507                                 return SR_ERR_ARG;
 508                         } else
 509                                 devc->triggerposition = tmp_double;
 510                         break;
 511                 case SR_CONF_BUFFERSIZE:
 512                         tmp_u64 = g_variant_get_uint64(data);
 513                         for (i = 0; i < NUM_BUFFER_SIZES; i++) {
 514                                 if (devc->profile->buffersizes[i] == tmp_u64) {
 515                                         devc->framesize = tmp_u64;
 516                                         break;
 517                                 }
 518                         }
 519                         if (i == NUM_BUFFER_SIZES)
 520                                 return SR_ERR_ARG;
 521                         break;
 522                 case SR_CONF_TIMEBASE:
 523                         g_variant_get(data, "(tt)", &p, &q);
 524                         tmp_int = -1;
 525                         for (i = 0; i < ARRAY_SIZE(timebases); i++) {
 526                                 if (timebases[i][0] == p && timebases[i][1] == q) {
 527                                         tmp_int = i;
 528                                         break;
 529                                 }
 530                         }
 531                         if (tmp_int >= 0)
 532                                 devc->timebase = tmp_int;
 533                         else
 534                                 return SR_ERR_ARG;
 535                         break;
 536                 case SR_CONF_TRIGGER_SOURCE:
 537                         tmp_str = g_variant_get_string(data, NULL);
 538                         for (i = 0; trigger_sources[i]; i++) {
 539                                 if (!strcmp(tmp_str, trigger_sources[i])) {
 540                                         devc->triggersource = g_strdup(tmp_str);
 541                                         break;
 542                                 }
 543                         }
 544                         if (trigger_sources[i] == 0)
 545                                 return SR_ERR_ARG;
 546                         break;
 547                 default:
 548                         return SR_ERR_NA;
 549                 }
 550         } else {
 551                 if (sdi->channel_groups->data == cg)
 552                         ch_idx = 0;
 553                 else if (sdi->channel_groups->next->data == cg)
 554                         ch_idx = 1;
 555                 else
 556                         return SR_ERR_ARG;
 557                 switch (key) {
 558                 case SR_CONF_FILTER:
 559                         devc->filter[ch_idx] = g_variant_get_boolean(data);
 560                         break;
 561                 case SR_CONF_VDIV:
 562                         g_variant_get(data, "(tt)", &p, &q);
 563                         tmp_int = -1;
 564                         for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 565                                 if (vdivs[i][0] == p && vdivs[i][1] == q) {
 566                                         tmp_int = i;
 567                                         break;
 568                                 }
 569                         }
 570                         if (tmp_int >= 0) {
 571                                 devc->voltage[ch_idx] = tmp_int;
 572                         } else
 573                                 return SR_ERR_ARG;
 574                         break;
 575                 case SR_CONF_COUPLING:
 576                         tmp_str = g_variant_get_string(data, NULL);
 577                         for (i = 0; coupling[i]; i++) {
 578                                 if (!strcmp(tmp_str, coupling[i])) {
 579                                         devc->coupling[ch_idx] = i;
 580                                         break;
 581                                 }
 582                         }
 583                         if (coupling[i] == 0)
 584                                 return SR_ERR_ARG;
 585                         break;
 586                 default:
 587                         return SR_ERR_NA;
 588                 }
 589         }
 590
 591         return SR_OK;
 592 }
 593
 594 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 595                 const struct sr_channel_group *cg)
 596 {
 597         struct dev_context *devc;
 598
 599         if (!cg) {
 600                 switch (key) {
 601                 case SR_CONF_SCAN_OPTIONS:
 602                 case SR_CONF_DEVICE_OPTIONS:
 603                         return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
 604                 case SR_CONF_BUFFERSIZE:
 605                         if (!sdi)
 606                                 return SR_ERR_ARG;
 607                         devc = sdi->priv;
 608                         *data = std_gvar_array_u64(devc->profile->buffersizes, NUM_BUFFER_SIZES);
 609                         break;
 610                 case SR_CONF_TIMEBASE:
 611                         *data = std_gvar_tuple_array(&timebases, ARRAY_SIZE(timebases));
 612                         break;
 613                 case SR_CONF_TRIGGER_SOURCE:
 614                         *data = g_variant_new_strv(ARRAY_AND_SIZE(trigger_sources));
 615                         break;
 616                 case SR_CONF_TRIGGER_SLOPE:
 617                         *data = g_variant_new_strv(ARRAY_AND_SIZE(trigger_slopes));
 618                         break;
 619                 default:
 620                         return SR_ERR_NA;
 621                 }
 622         } else {
 623                 switch (key) {
 624                 case SR_CONF_DEVICE_OPTIONS:
 625                         *data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg));
 626                         break;
 627                 case SR_CONF_COUPLING:
 628                         *data = g_variant_new_strv(ARRAY_AND_SIZE(coupling));
 629                         break;
 630                 case SR_CONF_VDIV:
 631                         *data = std_gvar_tuple_array(&vdivs, ARRAY_SIZE(vdivs));
 632                         break;
 633                 default:
 634                         return SR_ERR_NA;
 635                 }
 636         }
 637
 638         return SR_OK;
 639 }
 640
 641 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 642                 int num_samples)
 643 {
 644         struct sr_datafeed_packet packet;
 645         struct sr_datafeed_analog analog;
 646         struct sr_analog_encoding encoding;
 647         struct sr_analog_meaning meaning;
 648         struct sr_analog_spec spec;
 649         struct dev_context *devc = sdi->priv;
 650         GSList *channels = devc->enabled_channels;
 651
 652         packet.type = SR_DF_ANALOG;
 653         packet.payload = &analog;
 654         /* TODO: support for 5xxx series 9-bit samples */
 655         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
 656         analog.num_samples = num_samples;
 657         analog.meaning->mq = SR_MQ_VOLTAGE;
 658         analog.meaning->unit = SR_UNIT_VOLT;
 659         analog.meaning->mqflags = 0;
 660         /* TODO: Check malloc return value. */
 661         analog.data = g_try_malloc(num_samples * sizeof(float));
 662
 663         for (int ch = 0; ch < 2; ch++) {
 664                 if (!devc->ch_enabled[ch])
 665                         continue;
 666
 667                 float range = ((float)vdivs[devc->voltage[ch]][0] / vdivs[devc->voltage[ch]][1]) * 8;
 668                 float vdivlog = log10f(range / 255);
 669                 int digits = -(int)vdivlog + (vdivlog < 0.0);
 670                 analog.encoding->digits = digits;
 671                 analog.spec->spec_digits = digits;
 672                 analog.meaning->channels = g_slist_append(NULL, channels->data);
 673
 674                 for (int i = 0; i < num_samples; i++) {
 675                         /*
 676                          * The device always sends data for both channels. If a channel
 677                          * is disabled, it contains a copy of the enabled channel's
 678                          * data. However, we only send the requested channels to
 679                          * the bus.
 680                          *
 681                          * Voltage values are encoded as a value 0-255 (0-512 on the
 682                          * DSO-5200*), where the value is a point in the range
 683                          * represented by the vdiv setting. There are 8 vertical divs,
 684                          * so e.g. 500mV/div represents 4V peak-to-peak where 0 = -2V
 685                          * and 255 = +2V.
 686                          */
 687                         /* TODO: Support for DSO-5xxx series 9-bit samples. */
 688                         ((float *)analog.data)[i] = range / 255 * *(buf + i * 2 + 1 - ch) - range / 2;
 689                 }
 690                 sr_session_send(sdi, &packet);
 691                 g_slist_free(analog.meaning->channels);
 692
 693                 channels = channels->next;
 694         }
 695         g_free(analog.data);
 696 }
 697
 698 /*
 699  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 700  * Only channel data comes in asynchronously, and all transfers for this are
 701  * queued up beforehand, so this just needs to chuck the incoming data onto
 702  * the libsigrok session bus.
 703  */
 704 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 705 {
 706         struct sr_datafeed_packet packet;
 707         struct sr_dev_inst *sdi;
 708         struct dev_context *devc;
 709         int num_samples, pre;
 710
 711         sdi = transfer->user_data;
 712         devc = sdi->priv;
 713         sr_spew("receive_transfer(): status %s received %d bytes.",
 714                 libusb_error_name(transfer->status), transfer->actual_length);
 715
 716         if (transfer->actual_length == 0)
 717                 /* Nothing to send to the bus. */
 718                 return;
 719
 720         num_samples = transfer->actual_length / 2;
 721
 722         sr_spew("Got %d-%d/%d samples in frame.", devc->samp_received + 1,
 723                 devc->samp_received + num_samples, devc->framesize);
 724
 725         /*
 726          * The device always sends a full frame, but the beginning of the frame
 727          * doesn't represent the trigger point. The offset at which the trigger
 728          * happened came in with the capture state, so we need to start sending
 729          * from there up the session bus. The samples in the frame buffer
 730          * before that trigger point came after the end of the device's frame
 731          * buffer was reached, and it wrapped around to overwrite up until the
 732          * trigger point.
 733          */
 734         if (devc->samp_received < devc->trigger_offset) {
 735                 /* Trigger point not yet reached. */
 736                 if (devc->samp_received + num_samples < devc->trigger_offset) {
 737                         /* The entire chunk is before the trigger point. */
 738                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 739                                         transfer->buffer, num_samples * 2);
 740                         devc->samp_buffered += num_samples;
 741                 } else {
 742                         /*
 743                          * This chunk hits or overruns the trigger point.
 744                          * Store the part before the trigger fired, and
 745                          * send the rest up to the session bus.
 746                          */
 747                         pre = devc->trigger_offset - devc->samp_received;
 748                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 749                                         transfer->buffer, pre * 2);
 750                         devc->samp_buffered += pre;
 751
 752                         /* The rest of this chunk starts with the trigger point. */
 753                         sr_dbg("Reached trigger point, %d samples buffered.",
 754                                 devc->samp_buffered);
 755
 756                         /* Avoid the corner case where the chunk ended at
 757                          * exactly the trigger point. */
 758                         if (num_samples > pre)
 759                                 send_chunk(sdi, transfer->buffer + pre * 2,
 760                                                 num_samples - pre);
 761                 }
 762         } else {
 763                 /* Already past the trigger point, just send it all out. */
 764                 send_chunk(sdi, transfer->buffer, num_samples);
 765         }
 766
 767         devc->samp_received += num_samples;
 768
 769         /* Everything in this transfer was either copied to the buffer or
 770          * sent to the session bus. */
 771         g_free(transfer->buffer);
 772         libusb_free_transfer(transfer);
 773
 774         if (devc->samp_received >= devc->framesize) {
 775                 /* That was the last chunk in this frame. Send the buffered
 776                  * pre-trigger samples out now, in one big chunk. */
 777                 sr_dbg("End of frame, sending %d pre-trigger buffered samples.",
 778                         devc->samp_buffered);
 779                 send_chunk(sdi, devc->framebuf, devc->samp_buffered);
 780
 781                 /* Mark the end of this frame. */
 782                 packet.type = SR_DF_FRAME_END;
 783                 sr_session_send(sdi, &packet);
 784
 785                 if (devc->limit_frames && ++devc->num_frames == devc->limit_frames) {
 786                         /* Terminate session */
 787                         devc->dev_state = STOPPING;
 788                 } else {
 789                         devc->dev_state = NEW_CAPTURE;
 790                 }
 791         }
 792 }
 793
 794 static int handle_event(int fd, int revents, void *cb_data)
 795 {
 796         const struct sr_dev_inst *sdi;
 797         struct sr_datafeed_packet packet;
 798         struct timeval tv;
 799         struct sr_dev_driver *di;
 800         struct dev_context *devc;
 801         struct drv_context *drvc;
 802         int num_channels;
 803         uint32_t trigger_offset;
 804         uint8_t capturestate;
 805
 806         (void)fd;
 807         (void)revents;
 808
 809         sdi = cb_data;
 810         di = sdi->driver;
 811         drvc = di->context;
 812         devc = sdi->priv;
 813         if (devc->dev_state == STOPPING) {
 814                 /* We've been told to wind up the acquisition. */
 815                 sr_dbg("Stopping acquisition.");
 816                 /*
 817                  * TODO: Doesn't really cancel pending transfers so they might
 818                  * come in after SR_DF_END is sent.
 819                  */
 820                 usb_source_remove(sdi->session, drvc->sr_ctx);
 821
 822                 std_session_send_df_end(sdi);
 823
 824                 devc->dev_state = IDLE;
 825
 826                 return TRUE;
 827         }
 828
 829         /* Always handle pending libusb events. */
 830         tv.tv_sec = tv.tv_usec = 0;
 831         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 832
 833         /* TODO: ugh */
 834         if (devc->dev_state == NEW_CAPTURE) {
 835                 if (dso_capture_start(sdi) != SR_OK)
 836                         return TRUE;
 837                 if (dso_enable_trigger(sdi) != SR_OK)
 838                         return TRUE;
 839 //              if (dso_force_trigger(sdi) != SR_OK)
 840 //                      return TRUE;
 841                 sr_dbg("Successfully requested next chunk.");
 842                 devc->dev_state = CAPTURE;
 843                 return TRUE;
 844         }
 845         if (devc->dev_state != CAPTURE)
 846                 return TRUE;
 847
 848         if ((dso_get_capturestate(sdi, &capturestate, &trigger_offset)) != SR_OK)
 849                 return TRUE;
 850
 851         sr_dbg("Capturestate %d.", capturestate);
 852         sr_dbg("Trigger offset 0x%.6x.", trigger_offset);
 853         switch (capturestate) {
 854         case CAPTURE_EMPTY:
 855                 if (++devc->capture_empty_count >= MAX_CAPTURE_EMPTY) {
 856                         devc->capture_empty_count = 0;
 857                         if (dso_capture_start(sdi) != SR_OK)
 858                                 break;
 859                         if (dso_enable_trigger(sdi) != SR_OK)
 860                                 break;
 861 //                      if (dso_force_trigger(sdi) != SR_OK)
 862 //                              break;
 863                         sr_dbg("Successfully requested next chunk.");
 864                 }
 865                 break;
 866         case CAPTURE_FILLING:
 867                 /* No data yet. */
 868                 break;
 869         case CAPTURE_READY_8BIT:
 870                 /* Remember where in the captured frame the trigger is. */
 871                 devc->trigger_offset = trigger_offset;
 872
 873                 num_channels = (devc->ch_enabled[0] && devc->ch_enabled[1]) ? 2 : 1;
 874                 devc->framebuf = g_malloc(devc->framesize * num_channels * 2);
 875                 devc->samp_buffered = devc->samp_received = 0;
 876
 877                 /* Tell the scope to send us the first frame. */
 878                 if (dso_get_channeldata(sdi, receive_transfer) != SR_OK)
 879                         break;
 880
 881                 /*
 882                  * Don't hit the state machine again until we're done fetching
 883                  * the data we just told the scope to send.
 884                  */
 885                 devc->dev_state = FETCH_DATA;
 886
 887                 /* Tell the frontend a new frame is on the way. */
 888                 packet.type = SR_DF_FRAME_BEGIN;
 889                 sr_session_send(sdi, &packet);
 890                 break;
 891         case CAPTURE_READY_9BIT:
 892                 /* TODO */
 893                 sr_err("Not yet supported.");
 894                 break;
 895         case CAPTURE_TIMEOUT:
 896                 /* Doesn't matter, we'll try again next time. */
 897                 break;
 898         default:
 899                 sr_dbg("Unknown capture state: %d.", capturestate);
 900                 break;
 901         }
 902
 903         return TRUE;
 904 }
 905
 906 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 907 {
 908         struct dev_context *devc;
 909         struct sr_dev_driver *di = sdi->driver;
 910         struct drv_context *drvc = di->context;
 911
 912         devc = sdi->priv;
 913
 914         if (configure_channels(sdi) != SR_OK) {
 915                 sr_err("Failed to configure channels.");
 916                 return SR_ERR;
 917         }
 918
 919         if (dso_init(sdi) != SR_OK)
 920                 return SR_ERR;
 921
 922         if (dso_capture_start(sdi) != SR_OK)
 923                 return SR_ERR;
 924
 925         devc->dev_state = CAPTURE;
 926         usb_source_add(sdi->session, drvc->sr_ctx, TICK, handle_event, (void *)sdi);
 927
 928         std_session_send_df_header(sdi);
 929
 930         return SR_OK;
 931 }
 932
 933 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 934 {
 935         struct dev_context *devc;
 936
 937         devc = sdi->priv;
 938         devc->dev_state = STOPPING;
 939
 940         return SR_OK;
 941 }
 942
 943 static struct sr_dev_driver hantek_dso_driver_info = {
 944         .name = "hantek-dso",
 945         .longname = "Hantek DSO",
 946         .api_version = 1,
 947         .init = std_init,
 948         .cleanup = std_cleanup,
 949         .scan = scan,
 950         .dev_list = std_dev_list,
 951         .dev_clear = dev_clear,
 952         .config_get = config_get,
 953         .config_set = config_set,
 954         .config_list = config_list,
 955         .dev_open = dev_open,
 956         .dev_close = dev_close,
 957         .dev_acquisition_start = dev_acquisition_start,
 958         .dev_acquisition_stop = dev_acquisition_stop,
 959         .context = NULL,
 960 };
 961 SR_REGISTER_DEV_DRIVER(hantek_dso_driver_info);