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 SigSession::SigSession(DeviceManager &device_manager) :
  82         _device_manager(device_manager),
  83         _session(device_manager.context()->create_session()),
  84         _capture_state(Stopped)
  85 {
  86         set_default_device();
  87 }
  88
  89 SigSession::~SigSession()
  90 {
  91         // Stop and join to the thread
  92         stop_capture();
  93 }
  94
  95 DeviceManager& SigSession::device_manager()
  96 {
  97         return _device_manager;
  98 }
  99
 100 const DeviceManager& SigSession::device_manager() const
 101 {
 102         return _device_manager;
 103 }
 104
 105 const shared_ptr<sigrok::Session>& SigSession::session() const
 106 {
 107         return _session;
 108 }
 109
 110 shared_ptr<Device> SigSession::device() const
 111 {
 112         return _device;
 113 }
 114
 115 void SigSession::set_device(shared_ptr<Device> device)
 116 {
 117         // Ensure we are not capturing before setting the device
 118         stop_capture();
 119
 120         // Are we setting a session device?
 121         auto session_device = dynamic_pointer_cast<SessionDevice>(device);
 122         // Did we have a session device selected previously?
 123         auto prev_session_device = dynamic_pointer_cast<SessionDevice>(_device);
 124
 125         if (_device) {
 126                 _session->remove_datafeed_callbacks();
 127                 if (!prev_session_device) {
 128                         _device->close();
 129                         _session->remove_devices();
 130                 }
 131         }
 132
 133         if (session_device)
 134                 _session = session_device->parent();
 135
 136         _device = device;
 137         _decode_traces.clear();
 138
 139         if (device) {
 140                 if (!session_device)
 141                 {
 142                         _session = _device_manager.context()->create_session();
 143                         device->open();
 144                         _session->add_device(device);
 145                 }
 146                 _session->add_datafeed_callback([=]
 147                         (shared_ptr<Device> device, shared_ptr<Packet> packet) {
 148                                 data_feed_in(device, packet);
 149                         });
 150                 update_signals(device);
 151         }
 152 }
 153
 154 void SigSession::set_file(const string &name)
 155 {
 156         _session = _device_manager.context()->load_session(name);
 157         _device = _session->devices()[0];
 158         _decode_traces.clear();
 159         _session->add_datafeed_callback([=]
 160                 (shared_ptr<Device> device, shared_ptr<Packet> packet) {
 161                         data_feed_in(device, packet);
 162                 });
 163         _device_manager.update_display_name(_device);
 164         update_signals(_device);
 165 }
 166
 167 void SigSession::set_default_device()
 168 {
 169         shared_ptr<HardwareDevice> default_device;
 170         const list< shared_ptr<HardwareDevice> > &devices =
 171                 _device_manager.devices();
 172
 173         if (!devices.empty()) {
 174                 // Fall back to the first device in the list.
 175                 default_device = devices.front();
 176
 177                 // Try and find the demo device and select that by default
 178                 for (shared_ptr<HardwareDevice> dev : devices)
 179                         if (dev->driver()->name().compare("demo") == 0) {
 180                                 default_device = dev;
 181                                 break;
 182                         }
 183
 184                 set_device(default_device);
 185         }
 186 }
 187
 188 SigSession::capture_state SigSession::get_capture_state() const
 189 {
 190         lock_guard<mutex> lock(_sampling_mutex);
 191         return _capture_state;
 192 }
 193
 194 void SigSession::start_capture(function<void (const QString)> error_handler)
 195 {
 196         stop_capture();
 197
 198         // Check that a device instance has been selected.
 199         if (!_device) {
 200                 qDebug() << "No device selected";
 201                 return;
 202         }
 203
 204         // Check that at least one channel is enabled
 205         auto channels = _device->channels();
 206         bool enabled = std::any_of(channels.begin(), channels.end(),
 207                 [](shared_ptr<Channel> channel) { return channel->enabled(); });
 208
 209         if (!enabled) {
 210                 error_handler(tr("No channels enabled."));
 211                 return;
 212         }
 213
 214         // Begin the session
 215         _sampling_thread = std::thread(
 216                 &SigSession::sample_thread_proc, this, _device,
 217                         error_handler);
 218 }
 219
 220 void SigSession::stop_capture()
 221 {
 222         if (get_capture_state() != Stopped)
 223                 _session->stop();
 224
 225         // Check that sampling stopped
 226         if (_sampling_thread.joinable())
 227                 _sampling_thread.join();
 228 }
 229
 230 set< shared_ptr<data::SignalData> > SigSession::get_data() const
 231 {
 232         lock_guard<mutex> lock(_signals_mutex);
 233         set< shared_ptr<data::SignalData> > data;
 234         for (const shared_ptr<view::Signal> sig : _signals) {
 235                 assert(sig);
 236                 data.insert(sig->data());
 237         }
 238
 239         return data;
 240 }
 241
 242 vector< shared_ptr<view::Signal> > SigSession::get_signals() const
 243 {
 244         lock_guard<mutex> lock(_signals_mutex);
 245         return _signals;
 246 }
 247
 248 #ifdef ENABLE_DECODE
 249 bool SigSession::add_decoder(srd_decoder *const dec)
 250 {
 251         map<const srd_channel*, shared_ptr<view::LogicSignal> > channels;
 252         shared_ptr<data::DecoderStack> decoder_stack;
 253
 254         try
 255         {
 256                 lock_guard<mutex> lock(_signals_mutex);
 257
 258                 // Create the decoder
 259                 decoder_stack = shared_ptr<data::DecoderStack>(
 260                         new data::DecoderStack(*this, dec));
 261
 262                 // Make a list of all the channels
 263                 std::vector<const srd_channel*> all_channels;
 264                 for(const GSList *i = dec->channels; i; i = i->next)
 265                         all_channels.push_back((const srd_channel*)i->data);
 266                 for(const GSList *i = dec->opt_channels; i; i = i->next)
 267                         all_channels.push_back((const srd_channel*)i->data);
 268
 269                 // Auto select the initial channels
 270                 for (const srd_channel *pdch : all_channels)
 271                         for (shared_ptr<view::Signal> s : _signals)
 272                         {
 273                                 shared_ptr<view::LogicSignal> l =
 274                                         dynamic_pointer_cast<view::LogicSignal>(s);
 275                                 if (l && QString::fromUtf8(pdch->name).
 276                                         toLower().contains(
 277                                         l->get_name().toLower()))
 278                                         channels[pdch] = l;
 279                         }
 280
 281                 assert(decoder_stack);
 282                 assert(!decoder_stack->stack().empty());
 283                 assert(decoder_stack->stack().front());
 284                 decoder_stack->stack().front()->set_channels(channels);
 285
 286                 // Create the decode signal
 287                 shared_ptr<view::DecodeTrace> d(
 288                         new view::DecodeTrace(*this, decoder_stack,
 289                                 _decode_traces.size()));
 290                 _decode_traces.push_back(d);
 291         }
 292         catch(std::runtime_error e)
 293         {
 294                 return false;
 295         }
 296
 297         signals_changed();
 298
 299         // Do an initial decode
 300         decoder_stack->begin_decode();
 301
 302         return true;
 303 }
 304
 305 vector< shared_ptr<view::DecodeTrace> > SigSession::get_decode_signals() const
 306 {
 307         lock_guard<mutex> lock(_signals_mutex);
 308         return _decode_traces;
 309 }
 310
 311 void SigSession::remove_decode_signal(view::DecodeTrace *signal)
 312 {
 313         for (auto i = _decode_traces.begin(); i != _decode_traces.end(); i++)
 314                 if ((*i).get() == signal)
 315                 {
 316                         _decode_traces.erase(i);
 317                         signals_changed();
 318                         return;
 319                 }
 320 }
 321 #endif
 322
 323 void SigSession::set_capture_state(capture_state state)
 324 {
 325         lock_guard<mutex> lock(_sampling_mutex);
 326         const bool changed = _capture_state != state;
 327         _capture_state = state;
 328         if(changed)
 329                 capture_state_changed(state);
 330 }
 331
 332 void SigSession::update_signals(shared_ptr<Device> device)
 333 {
 334         assert(device);
 335         assert(_capture_state == Stopped);
 336
 337         // Clear the decode traces
 338         _decode_traces.clear();
 339
 340         // Detect what data types we will receive
 341         auto channels = device->channels();
 342         unsigned int logic_channel_count = std::count_if(
 343                 channels.begin(), channels.end(),
 344                 [] (shared_ptr<Channel> channel) {
 345                         return channel->type() == ChannelType::LOGIC; });
 346
 347         // Create data containers for the logic data snapshots
 348         {
 349                 lock_guard<mutex> data_lock(_data_mutex);
 350
 351                 _logic_data.reset();
 352                 if (logic_channel_count != 0) {
 353                         _logic_data.reset(new data::Logic(
 354                                 logic_channel_count));
 355                         assert(_logic_data);
 356                 }
 357         }
 358
 359         // Make the Signals list
 360         {
 361                 lock_guard<mutex> lock(_signals_mutex);
 362
 363                 _signals.clear();
 364
 365                 for (auto channel : device->channels()) {
 366                         shared_ptr<view::Signal> signal;
 367
 368                         switch(channel->type()->id()) {
 369                         case SR_CHANNEL_LOGIC:
 370                                 signal = shared_ptr<view::Signal>(
 371                                         new view::LogicSignal(*this, device,
 372                                                 channel, _logic_data));
 373                                 break;
 374
 375                         case SR_CHANNEL_ANALOG:
 376                         {
 377                                 shared_ptr<data::Analog> data(
 378                                         new data::Analog());
 379                                 signal = shared_ptr<view::Signal>(
 380                                         new view::AnalogSignal(
 381                                                 *this, channel, data));
 382                                 break;
 383                         }
 384
 385                         default:
 386                                 assert(0);
 387                                 break;
 388                         }
 389
 390                         assert(signal);
 391                         _signals.push_back(signal);
 392                 }
 393
 394         }
 395
 396         signals_changed();
 397 }
 398
 399 shared_ptr<view::Signal> SigSession::signal_from_channel(
 400         shared_ptr<Channel> channel) const
 401 {
 402         lock_guard<mutex> lock(_signals_mutex);
 403         for (shared_ptr<view::Signal> sig : _signals) {
 404                 assert(sig);
 405                 if (sig->channel() == channel)
 406                         return sig;
 407         }
 408         return shared_ptr<view::Signal>();
 409 }
 410
 411 void SigSession::read_sample_rate(shared_ptr<Device> device)
 412 {
 413         uint64_t sample_rate = VariantBase::cast_dynamic<Variant<guint64>>(
 414                 device->config_get(ConfigKey::SAMPLERATE)).get();
 415
 416         // Set the sample rate of all data
 417         const set< shared_ptr<data::SignalData> > data_set = get_data();
 418         for (shared_ptr<data::SignalData> data : data_set) {
 419                 assert(data);
 420                 data->set_samplerate(sample_rate);
 421         }
 422 }
 423
 424 void SigSession::sample_thread_proc(shared_ptr<Device> device,
 425         function<void (const QString)> error_handler)
 426 {
 427         assert(device);
 428         assert(error_handler);
 429
 430         read_sample_rate(device);
 431
 432         try {
 433                 _session->start();
 434         } catch(Error e) {
 435                 error_handler(e.what());
 436                 return;
 437         }
 438
 439         set_capture_state(_session->trigger() ?
 440                 AwaitingTrigger : Running);
 441
 442         _session->run();
 443         set_capture_state(Stopped);
 444
 445         // Confirm that SR_DF_END was received
 446         if (_cur_logic_snapshot)
 447         {
 448                 qDebug("SR_DF_END was not received.");
 449                 assert(0);
 450         }
 451 }
 452
 453 void SigSession::feed_in_header(shared_ptr<Device> device)
 454 {
 455         read_sample_rate(device);
 456 }
 457
 458 void SigSession::feed_in_meta(shared_ptr<Device> device,
 459         shared_ptr<Meta> meta)
 460 {
 461         (void)device;
 462
 463         for (auto entry : meta->config()) {
 464                 switch (entry.first->id()) {
 465                 case SR_CONF_SAMPLERATE:
 466                         /// @todo handle samplerate changes
 467                         break;
 468                 default:
 469                         // Unknown metadata is not an error.
 470                         break;
 471                 }
 472         }
 473
 474         signals_changed();
 475 }
 476
 477 void SigSession::feed_in_frame_begin()
 478 {
 479         if (_cur_logic_snapshot || !_cur_analog_snapshots.empty())
 480                 frame_began();
 481 }
 482
 483 void SigSession::feed_in_logic(shared_ptr<Logic> logic)
 484 {
 485         lock_guard<mutex> lock(_data_mutex);
 486
 487         if (!_logic_data)
 488         {
 489                 qDebug() << "Unexpected logic packet";
 490                 return;
 491         }
 492
 493         if (!_cur_logic_snapshot)
 494         {
 495                 // This could be the first packet after a trigger
 496                 set_capture_state(Running);
 497
 498                 // Get sample limit.
 499                 uint64_t sample_limit;
 500                 try {
 501                         sample_limit = VariantBase::cast_dynamic<Variant<guint64>>(
 502                                 _device->config_get(ConfigKey::LIMIT_SAMPLES)).get();
 503                 } catch (Error) {
 504                         sample_limit = 0;
 505                 }
 506
 507                 // Create a new data snapshot
 508                 _cur_logic_snapshot = shared_ptr<data::LogicSnapshot>(
 509                         new data::LogicSnapshot(logic, sample_limit));
 510                 _logic_data->push_snapshot(_cur_logic_snapshot);
 511
 512                 // @todo Putting this here means that only listeners querying
 513                 // for logic will be notified. Currently the only user of
 514                 // frame_began is DecoderStack, but in future we need to signal
 515                 // this after both analog and logic sweeps have begun.
 516                 frame_began();
 517         }
 518         else
 519         {
 520                 // Append to the existing data snapshot
 521                 _cur_logic_snapshot->append_payload(logic);
 522         }
 523
 524         data_received();
 525 }
 526
 527 void SigSession::feed_in_analog(shared_ptr<Analog> analog)
 528 {
 529         lock_guard<mutex> lock(_data_mutex);
 530
 531         const vector<shared_ptr<Channel>> channels = analog->channels();
 532         const unsigned int channel_count = channels.size();
 533         const size_t sample_count = analog->num_samples() / channel_count;
 534         const float *data = analog->data_pointer();
 535         bool sweep_beginning = false;
 536
 537         for (auto channel : channels)
 538         {
 539                 shared_ptr<data::AnalogSnapshot> snapshot;
 540
 541                 // Try to get the snapshot of the channel
 542                 const map< shared_ptr<Channel>, shared_ptr<data::AnalogSnapshot> >::
 543                         iterator iter = _cur_analog_snapshots.find(channel);
 544                 if (iter != _cur_analog_snapshots.end())
 545                         snapshot = (*iter).second;
 546                 else
 547                 {
 548                         // If no snapshot was found, this means we havn't
 549                         // created one yet. i.e. this is the first packet
 550                         // in the sweep containing this snapshot.
 551                         sweep_beginning = true;
 552
 553                         // Get sample limit.
 554                         uint64_t sample_limit;
 555                         try {
 556                                 sample_limit = VariantBase::cast_dynamic<Variant<guint64>>(
 557                                         _device->config_get(ConfigKey::LIMIT_SAMPLES)).get();
 558                         } catch (Error) {
 559                                 sample_limit = 0;
 560                         }
 561
 562                         // Create a snapshot, keep it in the maps of channels
 563                         snapshot = shared_ptr<data::AnalogSnapshot>(
 564                                 new data::AnalogSnapshot(sample_limit));
 565                         _cur_analog_snapshots[channel] = snapshot;
 566
 567                         // Find the annalog data associated with the channel
 568                         shared_ptr<view::AnalogSignal> sig =
 569                                 dynamic_pointer_cast<view::AnalogSignal>(
 570                                         signal_from_channel(channel));
 571                         assert(sig);
 572
 573                         shared_ptr<data::Analog> data(sig->analog_data());
 574                         assert(data);
 575
 576                         // Push the snapshot into the analog data.
 577                         data->push_snapshot(snapshot);
 578                 }
 579
 580                 assert(snapshot);
 581
 582                 // Append the samples in the snapshot
 583                 snapshot->append_interleaved_samples(data++, sample_count,
 584                         channel_count);
 585         }
 586
 587         if (sweep_beginning) {
 588                 // This could be the first packet after a trigger
 589                 set_capture_state(Running);
 590         }
 591
 592         data_received();
 593 }
 594
 595 void SigSession::data_feed_in(shared_ptr<Device> device, shared_ptr<Packet> packet)
 596 {
 597         assert(device);
 598         assert(packet);
 599
 600         switch (packet->type()->id()) {
 601         case SR_DF_HEADER:
 602                 feed_in_header(device);
 603                 break;
 604
 605         case SR_DF_META:
 606                 feed_in_meta(device, dynamic_pointer_cast<Meta>(packet->payload()));
 607                 break;
 608
 609         case SR_DF_FRAME_BEGIN:
 610                 feed_in_frame_begin();
 611                 break;
 612
 613         case SR_DF_LOGIC:
 614                 feed_in_logic(dynamic_pointer_cast<Logic>(packet->payload()));
 615                 break;
 616
 617         case SR_DF_ANALOG:
 618                 feed_in_analog(dynamic_pointer_cast<Analog>(packet->payload()));
 619                 break;
 620
 621         case SR_DF_END:
 622         {
 623                 {
 624                         lock_guard<mutex> lock(_data_mutex);
 625                         _cur_logic_snapshot.reset();
 626                         _cur_analog_snapshots.clear();
 627                 }
 628                 frame_ended();
 629                 break;
 630         }
 631         default:
 632                 break;
 633         }
 634 }
 635
 636 } // namespace pv