pv/sigsession.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2012-14 Joel Holdsworth <joel@airwebreathe.org.uk>
   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 2 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, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #ifdef ENABLE_DECODE
  22 #include <libsigrokdecode/libsigrokdecode.h>
  23 #endif
  24
  25 #include "sigsession.h"
  26
  27 #include "devicemanager.h"
  28
  29 #include "data/analog.h"
  30 #include "data/analogsnapshot.h"
  31 #include "data/decoderstack.h"
  32 #include "data/logic.h"
  33 #include "data/logicsnapshot.h"
  34 #include "data/decode/decoder.h"
  35
  36 #include "view/analogsignal.h"
  37 #include "view/decodetrace.h"
  38 #include "view/logicsignal.h"
  39
  40 #include <cassert>
  41 #include <mutex>
  42 #include <stdexcept>
  43
  44 #include <sys/stat.h>
  45
  46 #include <QDebug>
  47
  48 #include <libsigrok/libsigrok.hpp>
  49
  50 using std::dynamic_pointer_cast;
  51 using std::function;
  52 using std::lock_guard;
  53 using std::mutex;
  54 using std::list;
  55 using std::map;
  56 using std::set;
  57 using std::shared_ptr;
  58 using std::string;
  59 using std::vector;
  60
  61 using sigrok::Analog;
  62 using sigrok::Channel;
  63 using sigrok::ChannelType;
  64 using sigrok::ConfigKey;
  65 using sigrok::DatafeedCallbackFunction;
  66 using sigrok::Device;
  67 using sigrok::Error;
  68 using sigrok::HardwareDevice;
  69 using sigrok::Header;
  70 using sigrok::Logic;
  71 using sigrok::Meta;
  72 using sigrok::Packet;
  73 using sigrok::PacketPayload;
  74 using sigrok::Session;
  75 using sigrok::SessionDevice;
  76
  77 using Glib::VariantBase;
  78 using Glib::Variant;
  79
  80 namespace pv {
  81
  82 // TODO: This should not be necessary
  83 shared_ptr<Session> SigSession::_sr_session = nullptr;
  84
  85 SigSession::SigSession(DeviceManager &device_manager) :
  86         _device_manager(device_manager),
  87         _capture_state(Stopped)
  88 {
  89         // TODO: This should not be necessary
  90         _sr_session = device_manager.context()->create_session();
  91
  92         set_default_device();
  93 }
  94
  95 SigSession::~SigSession()
  96 {
  97         // Stop and join to the thread
  98         stop_capture();
  99 }
 100
 101 shared_ptr<Device> SigSession::device() const
 102 {
 103         return _device;
 104 }
 105
 106 void SigSession::set_device(shared_ptr<Device> device)
 107 {
 108         // Ensure we are not capturing before setting the device
 109         stop_capture();
 110
 111         // Are we setting a session device?
 112         auto session_device = dynamic_pointer_cast<SessionDevice>(device);
 113         // Did we have a session device selected previously?
 114         auto prev_session_device = dynamic_pointer_cast<SessionDevice>(_device);
 115
 116         if (_device) {
 117                 _sr_session->remove_datafeed_callbacks();
 118                 if (!prev_session_device) {
 119                         _device->close();
 120                         _sr_session->remove_devices();
 121                 }
 122         }
 123
 124         if (session_device)
 125                 _sr_session = session_device->parent();
 126
 127         _device = device;
 128         _decode_traces.clear();
 129
 130         if (device) {
 131                 if (!session_device)
 132                 {
 133                         _sr_session = _device_manager.context()->create_session();
 134                         device->open();
 135                         _sr_session->add_device(device);
 136                 }
 137                 _sr_session->add_datafeed_callback([=]
 138                         (shared_ptr<Device> device, shared_ptr<Packet> packet) {
 139                                 data_feed_in(device, packet);
 140                         });
 141                 update_signals(device);
 142         }
 143 }
 144
 145 void SigSession::set_file(const string &name)
 146 {
 147         _sr_session = _device_manager.context()->load_session(name);
 148         _device = _sr_session->devices()[0];
 149         _decode_traces.clear();
 150         _sr_session->add_datafeed_callback([=]
 151                 (shared_ptr<Device> device, shared_ptr<Packet> packet) {
 152                         data_feed_in(device, packet);
 153                 });
 154         _device_manager.update_display_name(_device);
 155         update_signals(_device);
 156 }
 157
 158 void SigSession::set_default_device()
 159 {
 160         shared_ptr<HardwareDevice> default_device;
 161         const list< shared_ptr<HardwareDevice> > &devices =
 162                 _device_manager.devices();
 163
 164         if (!devices.empty()) {
 165                 // Fall back to the first device in the list.
 166                 default_device = devices.front();
 167
 168                 // Try and find the demo device and select that by default
 169                 for (shared_ptr<HardwareDevice> dev : devices)
 170                         if (dev->driver()->name().compare("demo") == 0) {
 171                                 default_device = dev;
 172                                 break;
 173                         }
 174
 175                 set_device(default_device);
 176         }
 177 }
 178
 179 SigSession::capture_state SigSession::get_capture_state() const
 180 {
 181         lock_guard<mutex> lock(_sampling_mutex);
 182         return _capture_state;
 183 }
 184
 185 void SigSession::start_capture(function<void (const QString)> error_handler)
 186 {
 187         stop_capture();
 188
 189         // Check that a device instance has been selected.
 190         if (!_device) {
 191                 qDebug() << "No device selected";
 192                 return;
 193         }
 194
 195         // Check that at least one channel is enabled
 196         auto channels = _device->channels();
 197         bool enabled = std::any_of(channels.begin(), channels.end(),
 198                 [](shared_ptr<Channel> channel) { return channel->enabled(); });
 199
 200         if (!enabled) {
 201                 error_handler(tr("No channels enabled."));
 202                 return;
 203         }
 204
 205         // Begin the session
 206         _sampling_thread = std::thread(
 207                 &SigSession::sample_thread_proc, this, _device,
 208                         error_handler);
 209 }
 210
 211 void SigSession::stop_capture()
 212 {
 213         if (get_capture_state() != Stopped)
 214                 _sr_session->stop();
 215
 216         // Check that sampling stopped
 217         if (_sampling_thread.joinable())
 218                 _sampling_thread.join();
 219 }
 220
 221 set< shared_ptr<data::SignalData> > SigSession::get_data() const
 222 {
 223         lock_guard<mutex> lock(_signals_mutex);
 224         set< shared_ptr<data::SignalData> > data;
 225         for (const shared_ptr<view::Signal> sig : _signals) {
 226                 assert(sig);
 227                 data.insert(sig->data());
 228         }
 229
 230         return data;
 231 }
 232
 233 vector< shared_ptr<view::Signal> > SigSession::get_signals() const
 234 {
 235         lock_guard<mutex> lock(_signals_mutex);
 236         return _signals;
 237 }
 238
 239 #ifdef ENABLE_DECODE
 240 bool SigSession::add_decoder(srd_decoder *const dec)
 241 {
 242         map<const srd_channel*, shared_ptr<view::LogicSignal> > channels;
 243         shared_ptr<data::DecoderStack> decoder_stack;
 244
 245         try
 246         {
 247                 lock_guard<mutex> lock(_signals_mutex);
 248
 249                 // Create the decoder
 250                 decoder_stack = shared_ptr<data::DecoderStack>(
 251                         new data::DecoderStack(*this, dec));
 252
 253                 // Make a list of all the channels
 254                 std::vector<const srd_channel*> all_channels;
 255                 for(const GSList *i = dec->channels; i; i = i->next)
 256                         all_channels.push_back((const srd_channel*)i->data);
 257                 for(const GSList *i = dec->opt_channels; i; i = i->next)
 258                         all_channels.push_back((const srd_channel*)i->data);
 259
 260                 // Auto select the initial channels
 261                 for (const srd_channel *pdch : all_channels)
 262                         for (shared_ptr<view::Signal> s : _signals)
 263                         {
 264                                 shared_ptr<view::LogicSignal> l =
 265                                         dynamic_pointer_cast<view::LogicSignal>(s);
 266                                 if (l && QString::fromUtf8(pdch->name).
 267                                         toLower().contains(
 268                                         l->get_name().toLower()))
 269                                         channels[pdch] = l;
 270                         }
 271
 272                 assert(decoder_stack);
 273                 assert(!decoder_stack->stack().empty());
 274                 assert(decoder_stack->stack().front());
 275                 decoder_stack->stack().front()->set_channels(channels);
 276
 277                 // Create the decode signal
 278                 shared_ptr<view::DecodeTrace> d(
 279                         new view::DecodeTrace(*this, decoder_stack,
 280                                 _decode_traces.size()));
 281                 _decode_traces.push_back(d);
 282         }
 283         catch(std::runtime_error e)
 284         {
 285                 return false;
 286         }
 287
 288         signals_changed();
 289
 290         // Do an initial decode
 291         decoder_stack->begin_decode();
 292
 293         return true;
 294 }
 295
 296 vector< shared_ptr<view::DecodeTrace> > SigSession::get_decode_signals() const
 297 {
 298         lock_guard<mutex> lock(_signals_mutex);
 299         return _decode_traces;
 300 }
 301
 302 void SigSession::remove_decode_signal(view::DecodeTrace *signal)
 303 {
 304         for (auto i = _decode_traces.begin(); i != _decode_traces.end(); i++)
 305                 if ((*i).get() == signal)
 306                 {
 307                         _decode_traces.erase(i);
 308                         signals_changed();
 309                         return;
 310                 }
 311 }
 312 #endif
 313
 314 void SigSession::set_capture_state(capture_state state)
 315 {
 316         lock_guard<mutex> lock(_sampling_mutex);
 317         const bool changed = _capture_state != state;
 318         _capture_state = state;
 319         if(changed)
 320                 capture_state_changed(state);
 321 }
 322
 323 void SigSession::update_signals(shared_ptr<Device> device)
 324 {
 325         assert(device);
 326         assert(_capture_state == Stopped);
 327
 328         // Clear the decode traces
 329         _decode_traces.clear();
 330
 331         // Detect what data types we will receive
 332         auto channels = device->channels();
 333         unsigned int logic_channel_count = std::count_if(
 334                 channels.begin(), channels.end(),
 335                 [] (shared_ptr<Channel> channel) {
 336                         return channel->type() == ChannelType::LOGIC; });
 337
 338         // Create data containers for the logic data snapshots
 339         {
 340                 lock_guard<mutex> data_lock(_data_mutex);
 341
 342                 _logic_data.reset();
 343                 if (logic_channel_count != 0) {
 344                         _logic_data.reset(new data::Logic(
 345                                 logic_channel_count));
 346                         assert(_logic_data);
 347                 }
 348         }
 349
 350         // Make the Signals list
 351         {
 352                 lock_guard<mutex> lock(_signals_mutex);
 353
 354                 _signals.clear();
 355
 356                 for (auto channel : device->channels()) {
 357                         shared_ptr<view::Signal> signal;
 358
 359                         switch(channel->type()->id()) {
 360                         case SR_CHANNEL_LOGIC:
 361                                 signal = shared_ptr<view::Signal>(
 362                                         new view::LogicSignal(*this, device,
 363                                                 channel, _logic_data));
 364                                 break;
 365
 366                         case SR_CHANNEL_ANALOG:
 367                         {
 368                                 shared_ptr<data::Analog> data(
 369                                         new data::Analog());
 370                                 signal = shared_ptr<view::Signal>(
 371                                         new view::AnalogSignal(
 372                                                 *this, channel, data));
 373                                 break;
 374                         }
 375
 376                         default:
 377                                 assert(0);
 378                                 break;
 379                         }
 380
 381                         assert(signal);
 382                         _signals.push_back(signal);
 383                 }
 384
 385         }
 386
 387         signals_changed();
 388 }
 389
 390 shared_ptr<view::Signal> SigSession::signal_from_channel(
 391         shared_ptr<Channel> channel) const
 392 {
 393         lock_guard<mutex> lock(_signals_mutex);
 394         for (shared_ptr<view::Signal> sig : _signals) {
 395                 assert(sig);
 396                 if (sig->channel() == channel)
 397                         return sig;
 398         }
 399         return shared_ptr<view::Signal>();
 400 }
 401
 402 void SigSession::read_sample_rate(shared_ptr<Device> device)
 403 {
 404         uint64_t sample_rate = VariantBase::cast_dynamic<Variant<guint64>>(
 405                 device->config_get(ConfigKey::SAMPLERATE)).get();
 406
 407         // Set the sample rate of all data
 408         const set< shared_ptr<data::SignalData> > data_set = get_data();
 409         for (shared_ptr<data::SignalData> data : data_set) {
 410                 assert(data);
 411                 data->set_samplerate(sample_rate);
 412         }
 413 }
 414
 415 void SigSession::sample_thread_proc(shared_ptr<Device> device,
 416         function<void (const QString)> error_handler)
 417 {
 418         assert(device);
 419         assert(error_handler);
 420
 421         read_sample_rate(device);
 422
 423         try {
 424                 _sr_session->start();
 425         } catch(Error e) {
 426                 error_handler(e.what());
 427                 return;
 428         }
 429
 430         set_capture_state(_sr_session->trigger() ?
 431                 AwaitingTrigger : Running);
 432
 433         _sr_session->run();
 434         set_capture_state(Stopped);
 435
 436         // Confirm that SR_DF_END was received
 437         if (_cur_logic_snapshot)
 438         {
 439                 qDebug("SR_DF_END was not received.");
 440                 assert(0);
 441         }
 442 }
 443
 444 void SigSession::feed_in_header(shared_ptr<Device> device)
 445 {
 446         read_sample_rate(device);
 447 }
 448
 449 void SigSession::feed_in_meta(shared_ptr<Device> device,
 450         shared_ptr<Meta> meta)
 451 {
 452         (void)device;
 453
 454         for (auto entry : meta->config()) {
 455                 switch (entry.first->id()) {
 456                 case SR_CONF_SAMPLERATE:
 457                         /// @todo handle samplerate changes
 458                         break;
 459                 default:
 460                         // Unknown metadata is not an error.
 461                         break;
 462                 }
 463         }
 464
 465         signals_changed();
 466 }
 467
 468 void SigSession::feed_in_frame_begin()
 469 {
 470         if (_cur_logic_snapshot || !_cur_analog_snapshots.empty())
 471                 frame_began();
 472 }
 473
 474 void SigSession::feed_in_logic(shared_ptr<Logic> logic)
 475 {
 476         lock_guard<mutex> lock(_data_mutex);
 477
 478         if (!_logic_data)
 479         {
 480                 qDebug() << "Unexpected logic packet";
 481                 return;
 482         }
 483
 484         if (!_cur_logic_snapshot)
 485         {
 486                 // This could be the first packet after a trigger
 487                 set_capture_state(Running);
 488
 489                 // Get sample limit.
 490                 uint64_t sample_limit;
 491                 try {
 492                         sample_limit = VariantBase::cast_dynamic<Variant<guint64>>(
 493                                 _device->config_get(ConfigKey::LIMIT_SAMPLES)).get();
 494                 } catch (Error) {
 495                         sample_limit = 0;
 496                 }
 497
 498                 // Create a new data snapshot
 499                 _cur_logic_snapshot = shared_ptr<data::LogicSnapshot>(
 500                         new data::LogicSnapshot(logic, sample_limit));
 501                 _logic_data->push_snapshot(_cur_logic_snapshot);
 502
 503                 // @todo Putting this here means that only listeners querying
 504                 // for logic will be notified. Currently the only user of
 505                 // frame_began is DecoderStack, but in future we need to signal
 506                 // this after both analog and logic sweeps have begun.
 507                 frame_began();
 508         }
 509         else
 510         {
 511                 // Append to the existing data snapshot
 512                 _cur_logic_snapshot->append_payload(logic);
 513         }
 514
 515         data_received();
 516 }
 517
 518 void SigSession::feed_in_analog(shared_ptr<Analog> analog)
 519 {
 520         lock_guard<mutex> lock(_data_mutex);
 521
 522         const vector<shared_ptr<Channel>> channels = analog->channels();
 523         const unsigned int channel_count = channels.size();
 524         const size_t sample_count = analog->num_samples() / channel_count;
 525         const float *data = analog->data_pointer();
 526         bool sweep_beginning = false;
 527
 528         for (auto channel : channels)
 529         {
 530                 shared_ptr<data::AnalogSnapshot> snapshot;
 531
 532                 // Try to get the snapshot of the channel
 533                 const map< shared_ptr<Channel>, shared_ptr<data::AnalogSnapshot> >::
 534                         iterator iter = _cur_analog_snapshots.find(channel);
 535                 if (iter != _cur_analog_snapshots.end())
 536                         snapshot = (*iter).second;
 537                 else
 538                 {
 539                         // If no snapshot was found, this means we havn't
 540                         // created one yet. i.e. this is the first packet
 541                         // in the sweep containing this snapshot.
 542                         sweep_beginning = true;
 543
 544                         // Get sample limit.
 545                         uint64_t sample_limit;
 546                         try {
 547                                 sample_limit = VariantBase::cast_dynamic<Variant<guint64>>(
 548                                         _device->config_get(ConfigKey::LIMIT_SAMPLES)).get();
 549                         } catch (Error) {
 550                                 sample_limit = 0;
 551                         }
 552
 553                         // Create a snapshot, keep it in the maps of channels
 554                         snapshot = shared_ptr<data::AnalogSnapshot>(
 555                                 new data::AnalogSnapshot(sample_limit));
 556                         _cur_analog_snapshots[channel] = snapshot;
 557
 558                         // Find the annalog data associated with the channel
 559                         shared_ptr<view::AnalogSignal> sig =
 560                                 dynamic_pointer_cast<view::AnalogSignal>(
 561                                         signal_from_channel(channel));
 562                         assert(sig);
 563
 564                         shared_ptr<data::Analog> data(sig->analog_data());
 565                         assert(data);
 566
 567                         // Push the snapshot into the analog data.
 568                         data->push_snapshot(snapshot);
 569                 }
 570
 571                 assert(snapshot);
 572
 573                 // Append the samples in the snapshot
 574                 snapshot->append_interleaved_samples(data++, sample_count,
 575                         channel_count);
 576         }
 577
 578         if (sweep_beginning) {
 579                 // This could be the first packet after a trigger
 580                 set_capture_state(Running);
 581         }
 582
 583         data_received();
 584 }
 585
 586 void SigSession::data_feed_in(shared_ptr<Device> device, shared_ptr<Packet> packet)
 587 {
 588         assert(device);
 589         assert(packet);
 590
 591         switch (packet->type()->id()) {
 592         case SR_DF_HEADER:
 593                 feed_in_header(device);
 594                 break;
 595
 596         case SR_DF_META:
 597                 feed_in_meta(device, dynamic_pointer_cast<Meta>(packet->payload()));
 598                 break;
 599
 600         case SR_DF_FRAME_BEGIN:
 601                 feed_in_frame_begin();
 602                 break;
 603
 604         case SR_DF_LOGIC:
 605                 feed_in_logic(dynamic_pointer_cast<Logic>(packet->payload()));
 606                 break;
 607
 608         case SR_DF_ANALOG:
 609                 feed_in_analog(dynamic_pointer_cast<Analog>(packet->payload()));
 610                 break;
 611
 612         case SR_DF_END:
 613         {
 614                 {
 615                         lock_guard<mutex> lock(_data_mutex);
 616                         _cur_logic_snapshot.reset();
 617                         _cur_analog_snapshots.clear();
 618                 }
 619                 frame_ended();
 620                 break;
 621         }
 622         default:
 623                 break;
 624         }
 625 }
 626
 627 } // namespace pv