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