hardware/saleae-logic/saleae-logic.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2010 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 <stdlib.h>
  22 #include <sys/time.h>
  23 #include <inttypes.h>
  24 #include <glib.h>
  25 #include <libusb.h>
  26 #include "config.h"
  27 #include "sigrok.h"
  28
  29 #define USB_VENDOR                              0x0925
  30 #define USB_PRODUCT                     0x3881
  31 #define USB_VENDOR_NAME         "Saleae"
  32 #define USB_MODEL_NAME                  "Logic"
  33 #define USB_MODEL_VERSION               ""
  34
  35 #define USB_INTERFACE                   0
  36 #define USB_CONFIGURATION               1
  37 #define NUM_PROBES                              8
  38 #define NUM_TRIGGER_STAGES              4
  39 #define TRIGGER_TYPES                   "01"
  40 #define FIRMWARE                                FIRMWARE_DIR "/saleae-logic.firmware"
  41
  42 /* delay in ms */
  43 #define FIRMWARE_RENUM_DELAY    2000
  44 #define NUM_SIMUL_TRANSFERS     10
  45 #define MAX_EMPTY_TRANSFERS     NUM_SIMUL_TRANSFERS * 2
  46
  47 /* software trigger implementation: positive values indicate trigger stage */
  48 #define TRIGGER_FIRED                   -1
  49
  50
  51 /* there is only one model Saleae Logic, and this is what it supports */
  52 static int capabilities[] = {
  53         HWCAP_LOGIC_ANALYZER,
  54         HWCAP_SAMPLERATE,
  55
  56         /* these are really implemented in the driver, not the hardware */
  57         HWCAP_LIMIT_SAMPLES,
  58         0
  59 };
  60
  61 /* list of struct sigrok_device_instance, maintained by opendev() and closedev() */
  62 static GSList *device_instances = NULL;
  63
  64 /* since we can't keep track of a Saleae Logic device after upgrading the
  65  * firmware -- it re-enumerates into a different device address after the
  66  * upgrade -- this is like a global lock. No device will open until a proper
  67  * delay after the last device was upgraded.
  68  */
  69 GTimeVal firmware_updated = {0};
  70
  71 static libusb_context *usb_context = NULL;
  72
  73 static uint64_t supported_samplerates[] = {
  74         KHZ(200),
  75         KHZ(250),
  76         KHZ(500),
  77         MHZ(1),
  78         MHZ(2),
  79         MHZ(4),
  80         MHZ(8),
  81         MHZ(12),
  82         MHZ(16),
  83         MHZ(24),
  84         0
  85 };
  86
  87 static struct samplerates samplerates = {
  88         KHZ(200),
  89         MHZ(24),
  90         0,
  91         supported_samplerates
  92 };
  93
  94 /* TODO: all of these should go in a device-specific struct */
  95 static uint64_t cur_samplerate = 0;
  96 static uint64_t limit_samples = 0;
  97 static uint8_t probe_mask = 0, \
  98                 trigger_mask[NUM_TRIGGER_STAGES] = {0}, \
  99                 trigger_value[NUM_TRIGGER_STAGES] = {0}, \
 100                 trigger_buffer[NUM_TRIGGER_STAGES] = {0};;
 101 int trigger_stage = TRIGGER_FIRED;
 102
 103
 104 static int hw_set_configuration(int device_index, int capability, void *value);
 105
 106
 107 /* returns 1 if the device's configuration profile match the Logic firmware's
 108  * configuration, 0 otherwise
 109  */
 110 int check_conf_profile(libusb_device *dev)
 111 {
 112         struct libusb_device_descriptor des;
 113         struct libusb_config_descriptor *conf_dsc;
 114         const struct libusb_interface_descriptor *intf_dsc;
 115         int ret;
 116
 117         ret = -1;
 118         conf_dsc = NULL;
 119         while(ret == -1)
 120         {
 121                 /* assume it's not a Saleae Logic unless proven wrong */
 122                 ret = 0;
 123
 124                 if(libusb_get_device_descriptor(dev, &des) != 0)
 125                         break;
 126
 127                 if(des.bNumConfigurations != 1)
 128                         /* need exactly 1 configuration */
 129                         break;
 130
 131                 if(libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
 132                         break;
 133
 134                 if(conf_dsc->bNumInterfaces != 1)
 135                         /* need exactly 1 interface */
 136                         break;
 137
 138                 if(conf_dsc->interface[0].num_altsetting != 1)
 139                         /* need just one alternate setting */
 140                         break;
 141
 142                 intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
 143                 if(intf_dsc->bNumEndpoints != 2)
 144                         /* need 2 endpoints */
 145                         break;
 146
 147                 if((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) != (1 | LIBUSB_ENDPOINT_OUT))
 148                         /* first endpoint should be 1 (outbound) */
 149                         break;
 150
 151                 if((intf_dsc->endpoint[1].bEndpointAddress & 0x8f) != (2 | LIBUSB_ENDPOINT_IN))
 152                         /* first endpoint should be 2 (inbound) */
 153                         break;
 154
 155                 /* if we made it here, it must be a Saleae Logic */
 156                 ret = 1;
 157         }
 158         if(conf_dsc)
 159                 libusb_free_config_descriptor(conf_dsc);
 160
 161         return ret;
 162 }
 163
 164
 165 struct sigrok_device_instance *sl_open_device(int device_index)
 166 {
 167         struct sigrok_device_instance *sdi;
 168         libusb_device **devlist;
 169         struct libusb_device_descriptor des;
 170         int err, skip, i;
 171
 172         if(!(sdi = get_sigrok_device_instance(device_instances, device_index)))
 173                 return NULL;
 174
 175         libusb_get_device_list(usb_context, &devlist);
 176         if(sdi->status == ST_INITIALIZING)
 177         {
 178                 /* this device was renumerating last time we touched it. opendev() guarantees we've
 179                  * waited long enough for it to have booted properly, so now we need to find it on
 180                  * the bus and record its new address.
 181                  */
 182                 skip = 0;
 183                 for(i = 0; devlist[i]; i++)
 184                 {
 185                         if( (err = libusb_get_device_descriptor(devlist[i], &des)) )
 186                         {
 187                                 g_warning("failed to get device descriptor: %d", err);
 188                                 continue;
 189                         }
 190
 191                         if(des.idVendor == USB_VENDOR && des.idProduct == USB_PRODUCT)
 192                         {
 193                                 if(skip != device_index)
 194                                 {
 195                                         /* skip past devices of this type that aren't the one we want */
 196                                         skip++;
 197                                         continue;
 198                                 }
 199
 200                                 /* should check the bus here, since we know that already... but what
 201                                  * are we going to do if it doesn't match after the right number of skips?
 202                                  */
 203
 204                                 if( !(err = libusb_open(devlist[i], &(sdi->usb->devhdl))) )
 205                                 {
 206                                         sdi->usb->address = libusb_get_device_address(devlist[i]);
 207                                         sdi->status = ST_ACTIVE;
 208                                         g_message("opened device %d on %d.%d interface %d", sdi->index, sdi->usb->bus,
 209                                                         sdi->usb->address, USB_INTERFACE);
 210                                 }
 211                                 else
 212                                 {
 213                                         g_warning("failed to open device: %d", err);
 214                                         sdi = NULL;
 215                                 }
 216                         }
 217                 }
 218         }
 219         else if(sdi->status == ST_INACTIVE)
 220         {
 221                 /* this device is fully enumerated, so we need to find this device by
 222                  * vendor, product, bus and address */
 223                 libusb_get_device_list(usb_context, &devlist);
 224                 for(i = 0; devlist[i]; i++)
 225                 {
 226                         if( (err = libusb_get_device_descriptor(devlist[i], &des)) )
 227                         {
 228                                 g_warning("failed to get device descriptor: %d", err);
 229                                 continue;
 230                         }
 231
 232                         if(des.idVendor == USB_VENDOR && des.idProduct == USB_PRODUCT)
 233                         {
 234                                 if(libusb_get_bus_number(devlist[i]) == sdi->usb->bus &&
 235                                                 libusb_get_device_address(devlist[i]) == sdi->usb->address)
 236                                 {
 237                                         /* found it */
 238                                         if( !(err = libusb_open(devlist[i], &(sdi->usb->devhdl))) )
 239                                         {
 240                                                 sdi->status = ST_ACTIVE;
 241                                                 g_message("opened device %d on %d.%d interface %d", sdi->index, sdi->usb->bus,
 242                                                                 sdi->usb->address, USB_INTERFACE);
 243                                         }
 244                                         else
 245                                         {
 246                                                 g_warning("failed to open device: %d", err);
 247                                                 sdi = NULL;
 248                                         }
 249                                 }
 250                         }
 251                 }
 252         }
 253         else
 254         {
 255                 /* status must be ST_ACTIVE, i.e. already in use... */
 256                 sdi = NULL;
 257         }
 258         libusb_free_device_list(devlist, 1);
 259
 260         if(sdi && sdi->status != ST_ACTIVE)
 261                 sdi = NULL;
 262
 263         return sdi;
 264 }
 265
 266
 267 int upload_firmware(libusb_device *dev)
 268 {
 269         struct libusb_device_handle *hdl;
 270         int err;
 271
 272         g_message("uploading firmware to device on %d.%d",
 273                         libusb_get_bus_number(dev), libusb_get_device_address(dev));
 274
 275         err = libusb_open(dev, &hdl);
 276         if(err != 0)
 277         {
 278                 g_warning("failed to open device: %d", err);
 279                 return 1;
 280         }
 281
 282         err = libusb_set_configuration(hdl, USB_CONFIGURATION);
 283         if(err != 0)
 284         {
 285                 g_warning("Unable to set configuration: %d", err);
 286                 return 1;
 287         }
 288
 289         if((ezusb_reset(hdl, 1)) < 0)
 290                 return 1;
 291
 292         if(ezusb_install_firmware(hdl, FIRMWARE) != 0)
 293                 return 1;
 294
 295         if((ezusb_reset(hdl, 0)) < 0)
 296                 return 1;
 297
 298         libusb_close(hdl);
 299
 300         /* remember when the last firmware update was done */
 301         g_get_current_time(&firmware_updated);
 302
 303         return 0;
 304 }
 305
 306
 307 static void close_device(struct sigrok_device_instance *sdi)
 308 {
 309
 310         if(sdi->usb->devhdl)
 311         {
 312                 g_message("closing device %d on %d.%d interface %d", sdi->index, sdi->usb->bus,
 313                                 sdi->usb->address, USB_INTERFACE);
 314                 libusb_release_interface(sdi->usb->devhdl, USB_INTERFACE);
 315                 libusb_close(sdi->usb->devhdl);
 316                 sdi->usb->devhdl = NULL;
 317                 sdi->status = ST_INACTIVE;
 318         }
 319
 320 }
 321
 322
 323 static int configure_probes(GSList *probes)
 324 {
 325         struct probe *probe;
 326         GSList *l;
 327         int probe_bit, stage, i;
 328         char *tc;
 329
 330         probe_mask = 0;
 331         for(i = 0; i < NUM_TRIGGER_STAGES; i++)
 332         {
 333                 trigger_mask[i] = 0;
 334                 trigger_value[i] = 0;
 335         }
 336
 337         stage = -1;
 338         for(l = probes; l; l = l->next)
 339         {
 340                 probe = (struct probe *) l->data;
 341                 if(probe->enabled == FALSE)
 342                         continue;
 343                 probe_bit = 1 << (probe->index - 1);
 344                 probe_mask |= probe_bit;
 345                 if(probe->trigger)
 346                 {
 347                         stage = 0;
 348                         for(tc = probe->trigger; *tc; tc++)
 349                         {
 350                                 trigger_mask[stage] |= probe_bit;
 351                                 if(*tc == '1')
 352                                         trigger_value[stage] |= probe_bit;
 353                                 stage++;
 354                                 if(stage > NUM_TRIGGER_STAGES)
 355                                         return SIGROK_NOK;
 356                         }
 357                 }
 358         }
 359
 360         if(stage == -1)
 361                 /* we didn't configure any triggers, make sure acquisition doesn't wait for any */
 362                 trigger_stage = TRIGGER_FIRED;
 363         else
 364                 trigger_stage = 0;
 365
 366         return SIGROK_OK;
 367 }
 368
 369
 370
 371 /*
 372  * API callbacks
 373  */
 374
 375 static int hw_init(char *deviceinfo)
 376 {
 377         struct sigrok_device_instance *sdi;
 378         struct libusb_device_descriptor des;
 379         libusb_device **devlist;
 380         int err, devcnt, i;
 381
 382         if(libusb_init(&usb_context) != 0) {
 383                 g_warning("Failed to initialize USB.");
 384                 return 0;
 385         }
 386         libusb_set_debug(usb_context, 3);
 387
 388         /* find all Saleae Logic devices and upload firmware to all of them */
 389         devcnt = 0;
 390         libusb_get_device_list(usb_context, &devlist);
 391         for(i = 0; devlist[i]; i++) {
 392                 err = libusb_get_device_descriptor(devlist[i], &des);
 393                 if(err != 0) {
 394                         g_warning("failed to get device descriptor: %d", err);
 395                         continue;
 396                 }
 397
 398                 if(des.idVendor == USB_VENDOR && des.idProduct == USB_PRODUCT) {
 399                         /* definitely a Saleae Logic */
 400
 401                         sdi = sigrok_device_instance_new(devcnt, ST_INITIALIZING,
 402                                         USB_VENDOR_NAME, USB_MODEL_NAME, USB_MODEL_VERSION);
 403                         if(!sdi)
 404                                 return 0;
 405                         device_instances = g_slist_append(device_instances, sdi);
 406
 407                         if(check_conf_profile(devlist[i]) == 0)
 408                         {
 409                                 if(upload_firmware(devlist[i]) > 0)
 410                                         /* continue on the off chance that the device is in a working state */
 411                                         /* TODO: could maybe try a USB reset, or uploading the firmware again... */
 412                                         g_warning("firmware upload failed for device %d", devcnt);
 413
 414                                 sdi->usb = usb_device_instance_new(libusb_get_bus_number(devlist[i]), 0, NULL);
 415                         }
 416                         else {
 417                                 /* already has the firmware on it, so fix the new address */
 418                                 sdi->usb = usb_device_instance_new(libusb_get_bus_number(devlist[i]),
 419                                                 libusb_get_device_address(devlist[i]), NULL);
 420                         }
 421                         devcnt++;
 422                 }
 423         }
 424         libusb_free_device_list(devlist, 1);
 425
 426         return devcnt;
 427 }
 428
 429
 430 static int hw_opendev(int device_index)
 431 {
 432         GTimeVal cur_time;
 433         struct sigrok_device_instance *sdi;
 434         int timediff, err;
 435         unsigned int cur, upd;
 436
 437         if(firmware_updated.tv_sec > 0) {
 438                 /* firmware was recently uploaded */
 439                 g_get_current_time(&cur_time);
 440                 cur = cur_time.tv_sec * 1000 + cur_time.tv_usec / 1000;
 441                 upd = firmware_updated.tv_sec * 1000 + firmware_updated.tv_usec / 1000;
 442                 timediff = cur - upd;
 443                 if(timediff < FIRMWARE_RENUM_DELAY) {
 444                         timediff = FIRMWARE_RENUM_DELAY - timediff;
 445                         g_message("waiting %d ms for device to reset", timediff);
 446                         g_usleep(timediff * 1000);
 447                         firmware_updated.tv_sec = 0;
 448                 }
 449         }
 450
 451         if( !(sdi = sl_open_device(device_index)) ) {
 452                 g_warning("unable to open device");
 453                 return SIGROK_NOK;
 454         }
 455
 456         err = libusb_claim_interface(sdi->usb->devhdl, USB_INTERFACE);
 457         if(err != 0) {
 458                 g_warning("Unable to claim interface: %d", err);
 459                 return SIGROK_NOK;
 460         }
 461
 462         if(cur_samplerate == 0) {
 463                 /* sample rate hasn't been set; default to the slowest it has */
 464                 if(hw_set_configuration(device_index, HWCAP_SAMPLERATE, &supported_samplerates[0]) == SIGROK_NOK)
 465                         return SIGROK_NOK;
 466         }
 467
 468         return SIGROK_OK;
 469 }
 470
 471
 472 static void hw_closedev(int device_index)
 473 {
 474         struct sigrok_device_instance *sdi;
 475
 476         if( (sdi = get_sigrok_device_instance(device_instances, device_index)) )
 477                 close_device(sdi);
 478
 479 }
 480
 481
 482 static void hw_cleanup(void)
 483 {
 484         GSList *l;
 485
 486         /* properly close all devices */
 487         for(l = device_instances; l; l = l->next)
 488                 close_device( (struct sigrok_device_instance *) l->data);
 489
 490         /* and free all their memory */
 491         for(l = device_instances; l; l = l->next)
 492                 g_free(l->data);
 493         g_slist_free(device_instances);
 494         device_instances = NULL;
 495
 496         if(usb_context)
 497                 libusb_exit(usb_context);
 498         usb_context = NULL;
 499
 500 }
 501
 502
 503 static void *hw_get_device_info(int device_index, int device_info_id)
 504 {
 505         struct sigrok_device_instance *sdi;
 506         void *info;
 507
 508         if( !(sdi = get_sigrok_device_instance(device_instances, device_index)) )
 509                 return NULL;
 510
 511         info = NULL;
 512         switch(device_info_id)
 513         {
 514         case DI_INSTANCE:
 515                 info = sdi;
 516                 break;
 517         case DI_NUM_PROBES:
 518                 info = GINT_TO_POINTER(NUM_PROBES);
 519                 break;
 520         case DI_SAMPLERATES:
 521                 info = &samplerates;
 522                 break;
 523         case DI_TRIGGER_TYPES:
 524                 info = TRIGGER_TYPES;
 525                 break;
 526         case DI_CUR_SAMPLERATE:
 527                 info = &cur_samplerate;
 528                 break;
 529         }
 530
 531         return info;
 532 }
 533
 534
 535 static int hw_get_status(int device_index)
 536 {
 537         struct sigrok_device_instance *sdi;
 538
 539         sdi = get_sigrok_device_instance(device_instances, device_index);
 540         if(sdi)
 541                 return sdi->status;
 542         else
 543                 return ST_NOT_FOUND;
 544 }
 545
 546
 547 static int *hw_get_capabilities(void)
 548 {
 549
 550         return capabilities;
 551 }
 552
 553
 554 static int set_configuration_samplerate(struct sigrok_device_instance *sdi, uint64_t samplerate)
 555 {
 556         uint8_t divider;
 557         int ret, result, i;
 558         unsigned char buf[2];
 559
 560         for(i = 0; supported_samplerates[i]; i++) {
 561                 if(supported_samplerates[i] == samplerate)
 562                         break;
 563         }
 564         if(supported_samplerates[i] == 0)
 565                 return SIGROK_ERR_BADVALUE;
 566
 567         divider = (uint8_t) (48 / (float) (samplerate/1000000)) - 1;
 568
 569         g_message("setting samplerate to %"PRIu64" Hz (divider %d)", samplerate, divider);
 570         buf[0] = 0x01;
 571         buf[1] = divider;
 572         ret = libusb_bulk_transfer(sdi->usb->devhdl, 1 | LIBUSB_ENDPOINT_OUT, buf, 2, &result, 500);
 573         if(ret != 0) {
 574                 g_warning("failed to set samplerate: %d", ret);
 575                 return SIGROK_NOK;
 576         }
 577         cur_samplerate = samplerate;
 578
 579         return SIGROK_OK;
 580 }
 581
 582
 583 static int hw_set_configuration(int device_index, int capability, void *value)
 584 {
 585         struct sigrok_device_instance *sdi;
 586         int ret;
 587         uint64_t *tmp_u64;
 588
 589         if( !(sdi = get_sigrok_device_instance(device_instances, device_index)) )
 590                 return SIGROK_NOK;
 591
 592         if(capability == HWCAP_SAMPLERATE) {
 593                 tmp_u64 = value;
 594                 ret = set_configuration_samplerate(sdi, *tmp_u64);
 595         }
 596         else if(capability == HWCAP_PROBECONFIG)
 597                 ret = configure_probes( (GSList *) value);
 598         else if(capability == HWCAP_LIMIT_SAMPLES) {
 599                 limit_samples = strtoull(value, NULL, 10);
 600                 ret = SIGROK_OK;
 601         }
 602         else
 603                 ret = SIGROK_NOK;
 604
 605         return ret;
 606 }
 607
 608
 609 static int receive_data(int fd, int revents, void *user_data)
 610 {
 611         struct timeval tv;
 612
 613         tv.tv_sec = tv.tv_usec = 0;
 614         libusb_handle_events_timeout(usb_context, &tv);
 615
 616         return TRUE;
 617 }
 618
 619
 620 void receive_transfer(struct libusb_transfer *transfer)
 621 {
 622         static int num_samples = 0;
 623         static int empty_transfer_count = 0;
 624
 625         struct datafeed_packet packet;
 626         void *user_data;
 627         int cur_buflen, trigger_offset, i;
 628         unsigned char *cur_buf, *new_buf;
 629
 630         if(transfer == NULL) {
 631                 /* hw_stop_acquisition() telling us to stop */
 632                 num_samples = -1;
 633         }
 634
 635         if(num_samples == -1) {
 636                 /* acquisition has already ended, just free any queued up transfer that come in */
 637                 libusb_free_transfer(transfer);
 638         }
 639         else {
 640                 g_message("receive_transfer(): status %d received %d bytes", transfer->status, transfer->actual_length);
 641
 642                 /* save the incoming transfer before reusing the transfer struct */
 643                 cur_buf = transfer->buffer;
 644                 cur_buflen = transfer->actual_length;
 645                 user_data = transfer->user_data;
 646
 647                 /* fire off a new request */
 648                 new_buf = g_malloc(4096);
 649                 transfer->buffer = new_buf;
 650                 transfer->length = 4096;
 651                 if(libusb_submit_transfer(transfer) != 0) {
 652                         /* TODO: stop session? */
 653                         g_warning("eek");
 654                 }
 655
 656                 if(cur_buflen == 0) {
 657                         empty_transfer_count++;
 658                         if(empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 659                                 /* the FX2 gave up... end the acquisition, the frontend will work
 660                                  * out that the samplecount is short
 661                                  */
 662                                 packet.type = DF_END;
 663                                 session_bus(user_data, &packet);
 664                                 num_samples = -1;
 665                         }
 666                         return;
 667                 }
 668                 else
 669                         empty_transfer_count = 0;
 670
 671                 trigger_offset = 0;
 672                 if(trigger_stage >= 0)
 673                 {
 674                         for(i = 0; i < cur_buflen; i++)
 675                         {
 676                                 if((cur_buf[i] & trigger_mask[trigger_stage]) == trigger_value[trigger_stage])
 677                                 {
 678                                         /* match on this trigger stage */
 679                                         trigger_buffer[trigger_stage] = cur_buf[i];
 680                                         trigger_stage++;
 681                                         if(trigger_stage == NUM_TRIGGER_STAGES || trigger_mask[trigger_stage] == 0)
 682                                         {
 683                                                 /* match on all trigger stages, we're done */
 684                                                 trigger_offset = i+1;
 685
 686                                                 /* TODO: send pre-trigger buffer to session bus */
 687
 688                                                 /* tell the frontend we hit the trigger here */
 689                                                 packet.type = DF_TRIGGER;
 690                                                 packet.length = 0;
 691                                                 session_bus(user_data, &packet);
 692
 693                                                 /* send the samples that triggered it, since we're skipping past them */
 694                                                 packet.type = DF_LOGIC8;
 695                                                 packet.length = trigger_stage;
 696                                                 packet.payload = trigger_buffer;
 697                                                 session_bus(user_data, &packet);
 698                                                 break;
 699
 700                                                 trigger_stage = TRIGGER_FIRED;
 701                                         }
 702                                 }
 703                                 else if(trigger_stage > 0)
 704                                 {
 705                                         /* we had a match before, but not in the next sample. however, we may
 706                                          * have a match on this stage in the next bit -- trigger on 0001 will
 707                                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 708                                          * the next sample from the one that matched originally, which the
 709                                          * counter increment at the end of the loop takes care of.
 710                                          */
 711                                         i -= trigger_stage;
 712                                         if(i < -1)
 713                                                 /* oops, went back past this buffer */
 714                                                 i = -1;
 715                                         /* reset trigger stage */
 716                                         trigger_stage = 0;
 717                                 }
 718                         }
 719                 }
 720
 721                 if(trigger_stage == TRIGGER_FIRED)
 722                 {
 723                         /* send the incoming transfer to the session bus */
 724                         packet.type = DF_LOGIC8;
 725                         packet.length = cur_buflen - trigger_offset;
 726                         packet.payload = cur_buf + trigger_offset;
 727                         session_bus(user_data, &packet);
 728                         g_free(cur_buf);
 729
 730                         num_samples += cur_buflen;
 731                         if(num_samples > limit_samples)
 732                         {
 733                                 /* end the acquisition */
 734                                 packet.type = DF_END;
 735                                 session_bus(user_data, &packet);
 736                                 num_samples = -1;
 737                         }
 738                 }
 739                 else
 740                 {
 741                         /* TODO: buffer pre-trigger data in capture ratio-sized buffer */
 742
 743                 }
 744         }
 745
 746 }
 747
 748
 749 static int hw_start_acquisition(int device_index, gpointer session_device_id)
 750 {
 751         struct sigrok_device_instance *sdi;
 752         struct datafeed_packet *packet;
 753         struct datafeed_header *header;
 754         struct libusb_transfer *transfer;
 755         const struct libusb_pollfd **lupfd;
 756         int size, i;
 757         unsigned char *buf;
 758
 759         if( !(sdi = get_sigrok_device_instance(device_instances, device_index)))
 760                 return SIGROK_NOK;
 761
 762         packet = g_malloc(sizeof(struct datafeed_packet));
 763         header = g_malloc(sizeof(struct datafeed_header));
 764         if(!packet || !header)
 765                 return SIGROK_NOK;
 766
 767         /* start with 2K transfer, subsequently increased to 4K */
 768         size = 2048;
 769         for(i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 770                 buf = g_malloc(size);
 771                 transfer = libusb_alloc_transfer(0);
 772                 libusb_fill_bulk_transfer(transfer, sdi->usb->devhdl, 2 | LIBUSB_ENDPOINT_IN, buf, size,
 773                                 receive_transfer, session_device_id, 40);
 774                 if(libusb_submit_transfer(transfer) != 0) {
 775                         /* TODO: free them all */
 776                         libusb_free_transfer(transfer);
 777                         g_free(buf);
 778                         return SIGROK_NOK;
 779                 }
 780                 size = 4096;
 781         }
 782
 783         lupfd = libusb_get_pollfds(usb_context);
 784         for(i = 0; lupfd[i]; i++)
 785                 source_add(lupfd[i]->fd, lupfd[i]->events, -1, receive_data, NULL);
 786         free(lupfd);
 787
 788         packet->type = DF_HEADER;
 789         packet->length = sizeof(struct datafeed_header);
 790         packet->payload = (unsigned char *) header;
 791         header->feed_version = 1;
 792         gettimeofday(&header->starttime, NULL);
 793         header->samplerate = cur_samplerate;
 794         header->protocol_id = PROTO_RAW;
 795         header->num_probes = NUM_PROBES;
 796         session_bus(session_device_id, packet);
 797         g_free(header);
 798         g_free(packet);
 799
 800         return SIGROK_OK;
 801 }
 802
 803
 804 /* this stops acquisition on ALL devices, ignoring device_index */
 805 static void hw_stop_acquisition(int device_index, gpointer session_device_id)
 806 {
 807         struct datafeed_packet packet;
 808
 809         packet.type = DF_END;
 810         session_bus(session_device_id, &packet);
 811
 812         receive_transfer(NULL);
 813
 814         /* TODO: need to cancel and free any queued up transfers */
 815
 816 }
 817
 818
 819
 820 struct device_plugin saleae_logic_plugin_info = {
 821         "saleae-logic",
 822         1,
 823         hw_init,
 824         hw_cleanup,
 825
 826         hw_opendev,
 827         hw_closedev,
 828         hw_get_device_info,
 829         hw_get_status,
 830         hw_get_capabilities,
 831         hw_set_configuration,
 832         hw_start_acquisition,
 833         hw_stop_acquisition
 834 };
 835