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::set;
  64 using std::shared_ptr;
  65 using std::string;
  66 using std::unordered_set;
  67 using std::vector;
  68
  69 using sigrok::Analog;
  70 using sigrok::Channel;
  71 using sigrok::ChannelType;
  72 using sigrok::ConfigKey;
  73 using sigrok::DatafeedCallbackFunction;
  74 using sigrok::Error;
  75 using sigrok::Header;
  76 using sigrok::Logic;
  77 using sigrok::Meta;
  78 using sigrok::Packet;
  79 using sigrok::PacketPayload;
  80 using sigrok::Session;
  81 using sigrok::SessionDevice;
  82
  83 using Glib::VariantBase;
  84 using Glib::Variant;
  85
  86 namespace pv {
  87 Session::Session(DeviceManager &device_manager) :
  88         device_manager_(device_manager),
  89         capture_state_(Stopped),
  90         cur_samplerate_(0)
  91 {
  92         set_default_device();
  93 }
  94
  95 Session::~Session()
  96 {
  97         // Stop and join to the thread
  98         stop_capture();
  99 }
 100
 101 DeviceManager& Session::device_manager()
 102 {
 103         return device_manager_;
 104 }
 105
 106 const DeviceManager& Session::device_manager() const
 107 {
 108         return device_manager_;
 109 }
 110
 111 shared_ptr<sigrok::Session> Session::session() const
 112 {
 113         if (!device_)
 114                 return shared_ptr<sigrok::Session>();
 115         return device_->session();
 116 }
 117
 118 shared_ptr<devices::Device> Session::device() const
 119 {
 120         return device_;
 121 }
 122
 123 void Session::set_device(shared_ptr<devices::Device> device)
 124 {
 125         assert(device);
 126
 127         // Ensure we are not capturing before setting the device
 128         stop_capture();
 129
 130         device_ = std::move(device);
 131         device_->create();
 132         device_->session()->add_datafeed_callback([=]
 133                 (shared_ptr<sigrok::Device> device, shared_ptr<Packet> packet) {
 134                         data_feed_in(device, packet);
 135                 });
 136         update_signals(device_);
 137
 138         decode_traces_.clear();
 139
 140         device_selected();
 141 }
 142
 143 void Session::set_default_device()
 144 {
 145         const list< shared_ptr<devices::HardwareDevice> > &devices =
 146                 device_manager_.devices();
 147
 148         if (devices.empty())
 149                 return;
 150
 151         // Try and find the demo device and select that by default
 152         const auto iter = std::find_if(devices.begin(), devices.end(),
 153                 [] (const shared_ptr<devices::HardwareDevice> &d) {
 154                         return d->hardware_device()->driver()->name() ==
 155                         "demo"; });
 156         set_device((iter == devices.end()) ? devices.front() : *iter);
 157 }
 158
 159 Session::capture_state Session::get_capture_state() const
 160 {
 161         lock_guard<mutex> lock(sampling_mutex_);
 162         return capture_state_;
 163 }
 164
 165 void Session::start_capture(function<void (const QString)> error_handler)
 166 {
 167         stop_capture();
 168
 169         // Check that at least one channel is enabled
 170         assert(device_);
 171         const std::shared_ptr<sigrok::Device> device = device_->device();
 172         assert(device);
 173         auto channels = device->channels();
 174         bool enabled = std::any_of(channels.begin(), channels.end(),
 175                 [](shared_ptr<Channel> channel) { return channel->enabled(); });
 176
 177         if (!enabled) {
 178                 error_handler(tr("No channels enabled."));
 179                 return;
 180         }
 181
 182         // Begin the session
 183         sampling_thread_ = std::thread(
 184                 &Session::sample_thread_proc, this, device_,
 185                         error_handler);
 186 }
 187
 188 void Session::stop_capture()
 189 {
 190         if (get_capture_state() != Stopped)
 191                 device_->stop();
 192
 193         // Check that sampling stopped
 194         if (sampling_thread_.joinable())
 195                 sampling_thread_.join();
 196 }
 197
 198 set< shared_ptr<data::SignalData> > Session::get_data() const
 199 {
 200         shared_lock<shared_mutex> lock(signals_mutex_);
 201         set< shared_ptr<data::SignalData> > data;
 202         for (const shared_ptr<view::Signal> sig : signals_) {
 203                 assert(sig);
 204                 data.insert(sig->data());
 205         }
 206
 207         return data;
 208 }
 209
 210 boost::shared_mutex& Session::signals_mutex() const
 211 {
 212         return signals_mutex_;
 213 }
 214
 215 const unordered_set< shared_ptr<view::Signal> >& Session::signals() const
 216 {
 217         return signals_;
 218 }
 219
 220 #ifdef ENABLE_DECODE
 221 bool Session::add_decoder(srd_decoder *const dec)
 222 {
 223         map<const srd_channel*, shared_ptr<view::LogicSignal> > channels;
 224         shared_ptr<data::DecoderStack> decoder_stack;
 225
 226         try
 227         {
 228                 lock_guard<boost::shared_mutex> lock(signals_mutex_);
 229
 230                 // Create the decoder
 231                 decoder_stack = shared_ptr<data::DecoderStack>(
 232                         new data::DecoderStack(*this, dec));
 233
 234                 // Make a list of all the channels
 235                 std::vector<const srd_channel*> all_channels;
 236                 for(const GSList *i = dec->channels; i; i = i->next)
 237                         all_channels.push_back((const srd_channel*)i->data);
 238                 for(const GSList *i = dec->opt_channels; i; i = i->next)
 239                         all_channels.push_back((const srd_channel*)i->data);
 240
 241                 // Auto select the initial channels
 242                 for (const srd_channel *pdch : all_channels)
 243                         for (shared_ptr<view::Signal> s : signals_)
 244                         {
 245                                 shared_ptr<view::LogicSignal> l =
 246                                         dynamic_pointer_cast<view::LogicSignal>(s);
 247                                 if (l && QString::fromUtf8(pdch->name).
 248                                         toLower().contains(
 249                                         l->name().toLower()))
 250                                         channels[pdch] = l;
 251                         }
 252
 253                 assert(decoder_stack);
 254                 assert(!decoder_stack->stack().empty());
 255                 assert(decoder_stack->stack().front());
 256                 decoder_stack->stack().front()->set_channels(channels);
 257
 258                 // Create the decode signal
 259                 shared_ptr<view::DecodeTrace> d(
 260                         new view::DecodeTrace(*this, decoder_stack,
 261                                 decode_traces_.size()));
 262                 decode_traces_.push_back(d);
 263         }
 264         catch(std::runtime_error e)
 265         {
 266                 return false;
 267         }
 268
 269         signals_changed();
 270
 271         // Do an initial decode
 272         decoder_stack->begin_decode();
 273
 274         return true;
 275 }
 276
 277 vector< shared_ptr<view::DecodeTrace> > Session::get_decode_signals() const
 278 {
 279         shared_lock<shared_mutex> lock(signals_mutex_);
 280         return decode_traces_;
 281 }
 282
 283 void Session::remove_decode_signal(view::DecodeTrace *signal)
 284 {
 285         for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
 286                 if ((*i).get() == signal)
 287                 {
 288                         decode_traces_.erase(i);
 289                         signals_changed();
 290                         return;
 291                 }
 292 }
 293 #endif
 294
 295 void Session::set_capture_state(capture_state state)
 296 {
 297         lock_guard<mutex> lock(sampling_mutex_);
 298         const bool changed = capture_state_ != state;
 299         capture_state_ = state;
 300         if(changed)
 301                 capture_state_changed(state);
 302 }
 303
 304 void Session::update_signals(shared_ptr<devices::Device> device)
 305 {
 306         assert(device);
 307         assert(capture_state_ == Stopped);
 308
 309         // Detect what data types we will receive
 310         auto channels = device->device()->channels();
 311         unsigned int logic_channel_count = std::count_if(
 312                 channels.begin(), channels.end(),
 313                 [] (shared_ptr<Channel> channel) {
 314                         return channel->type() == ChannelType::LOGIC; });
 315
 316         // Create data containers for the logic data segments
 317         {
 318                 lock_guard<mutex> data_lock(data_mutex_);
 319
 320                 if (logic_channel_count == 0) {
 321                         logic_data_.reset();
 322                 } else if (!logic_data_ ||
 323                         logic_data_->num_channels() != logic_channel_count) {
 324                         logic_data_.reset(new data::Logic(
 325                                 logic_channel_count));
 326                         assert(logic_data_);
 327                 }
 328         }
 329
 330         // Make the Signals list
 331         {
 332                 unique_lock<shared_mutex> lock(signals_mutex_);
 333
 334                 unordered_set< shared_ptr<view::Signal> > prev_sigs(signals_);
 335                 signals_.clear();
 336
 337                 for (auto channel : device->device()->channels()) {
 338                         shared_ptr<view::Signal> signal;
 339
 340                         // Find the channel in the old signals
 341                         const auto iter = std::find_if(
 342                                 prev_sigs.cbegin(), prev_sigs.cend(),
 343                                 [&](const shared_ptr<view::Signal> &s) {
 344                                         return s->channel() == channel;
 345                                 });
 346                         if (iter != prev_sigs.end()) {
 347                                 // Copy the signal from the old set to the new
 348                                 signal = *iter;
 349                                 auto logic_signal = dynamic_pointer_cast<
 350                                         view::LogicSignal>(signal);
 351                                 if (logic_signal)
 352                                         logic_signal->set_logic_data(
 353                                                 logic_data_);
 354                         } else {
 355                                 // Create a new signal
 356                                 switch(channel->type()->id()) {
 357                                 case SR_CHANNEL_LOGIC:
 358                                         signal = shared_ptr<view::Signal>(
 359                                                 new view::LogicSignal(*this,
 360                                                         device, channel,
 361                                                         logic_data_));
 362                                         break;
 363
 364                                 case SR_CHANNEL_ANALOG:
 365                                 {
 366                                         shared_ptr<data::Analog> data(
 367                                                 new data::Analog());
 368                                         signal = shared_ptr<view::Signal>(
 369                                                 new view::AnalogSignal(
 370                                                         *this, channel, data));
 371                                         break;
 372                                 }
 373
 374                                 default:
 375                                         assert(0);
 376                                         break;
 377                                 }
 378                         }
 379
 380                         assert(signal);
 381                         signals_.insert(signal);
 382                 }
 383         }
 384
 385         signals_changed();
 386 }
 387
 388 shared_ptr<view::Signal> Session::signal_from_channel(
 389         shared_ptr<Channel> channel) const
 390 {
 391         lock_guard<boost::shared_mutex> lock(signals_mutex_);
 392         for (shared_ptr<view::Signal> sig : signals_) {
 393                 assert(sig);
 394                 if (sig->channel() == channel)
 395                         return sig;
 396         }
 397         return shared_ptr<view::Signal>();
 398 }
 399
 400 void Session::read_sample_rate(shared_ptr<sigrok::Device> device)
 401 {
 402         assert(device);
 403         const auto keys = device->config_keys(ConfigKey::DEVICE_OPTIONS);
 404         const auto iter = keys.find(ConfigKey::SAMPLERATE);
 405         cur_samplerate_ = (iter != keys.end() &&
 406                 (*iter).second.find(sigrok::GET) != (*iter).second.end()) ?
 407                 VariantBase::cast_dynamic<Variant<guint64>>(
 408                         device->config_get(ConfigKey::SAMPLERATE)).get() : 0;
 409 }
 410
 411 void Session::sample_thread_proc(shared_ptr<devices::Device> device,
 412         function<void (const QString)> error_handler)
 413 {
 414         assert(device);
 415         assert(error_handler);
 416
 417         const std::shared_ptr<sigrok::Device> sr_dev = device->device();
 418         assert(sr_dev);
 419         read_sample_rate(sr_dev);
 420
 421         try {
 422                 device_->session()->start();
 423         } catch(Error e) {
 424                 error_handler(e.what());
 425                 return;
 426         }
 427
 428         set_capture_state(device_->session()->trigger() ?
 429                 AwaitingTrigger : Running);
 430
 431         device_->run();
 432         set_capture_state(Stopped);
 433
 434         // Confirm that SR_DF_END was received
 435         if (cur_logic_segment_)
 436         {
 437                 qDebug("SR_DF_END was not received.");
 438                 assert(0);
 439         }
 440 }
 441
 442 void Session::feed_in_header()
 443 {
 444         read_sample_rate(device_->device());
 445 }
 446
 447 void Session::feed_in_meta(shared_ptr<Meta> meta)
 448 {
 449         for (auto entry : meta->config()) {
 450                 switch (entry.first->id()) {
 451                 case SR_CONF_SAMPLERATE:
 452                         /// @todo handle samplerate changes
 453                         break;
 454                 default:
 455                         // Unknown metadata is not an error.
 456                         break;
 457                 }
 458         }
 459
 460         signals_changed();
 461 }
 462
 463 void Session::feed_in_frame_begin()
 464 {
 465         if (cur_logic_segment_ || !cur_analog_segments_.empty())
 466                 frame_began();
 467 }
 468
 469 void Session::feed_in_logic(shared_ptr<Logic> logic)
 470 {
 471         lock_guard<mutex> lock(data_mutex_);
 472
 473         if (!logic_data_)
 474         {
 475                 qDebug() << "Unexpected logic packet";
 476                 return;
 477         }
 478
 479         if (!cur_logic_segment_)
 480         {
 481                 // This could be the first packet after a trigger
 482                 set_capture_state(Running);
 483
 484                 // Get sample limit.
 485                 assert(device_);
 486                 const std::shared_ptr<sigrok::Device> device =
 487                         device_->device();
 488                 assert(device);
 489                 const auto keys = device->config_keys(
 490                         ConfigKey::DEVICE_OPTIONS);
 491                 const auto iter = keys.find(ConfigKey::LIMIT_SAMPLES);
 492                 const uint64_t sample_limit = (iter != keys.end() &&
 493                         (*iter).second.find(sigrok::GET) !=
 494                         (*iter).second.end()) ?
 495                         VariantBase::cast_dynamic<Variant<guint64>>(
 496                         device->config_get(ConfigKey::LIMIT_SAMPLES)).get() : 0;
 497
 498                 // Create a new data segment
 499                 cur_logic_segment_ = shared_ptr<data::LogicSegment>(
 500                         new data::LogicSegment(
 501                                 logic, cur_samplerate_, sample_limit));
 502                 logic_data_->push_segment(cur_logic_segment_);
 503
 504                 // @todo Putting this here means that only listeners querying
 505                 // for logic will be notified. Currently the only user of
 506                 // frame_began is DecoderStack, but in future we need to signal
 507                 // this after both analog and logic sweeps have begun.
 508                 frame_began();
 509         }
 510         else
 511         {
 512                 // Append to the existing data segment
 513                 cur_logic_segment_->append_payload(logic);
 514         }
 515
 516         data_received();
 517 }
 518
 519 void Session::feed_in_analog(shared_ptr<Analog> analog)
 520 {
 521         lock_guard<mutex> lock(data_mutex_);
 522
 523         const vector<shared_ptr<Channel>> channels = analog->channels();
 524         const unsigned int channel_count = channels.size();
 525         const size_t sample_count = analog->num_samples() / channel_count;
 526         const float *data = analog->data_pointer();
 527         bool sweep_beginning = false;
 528
 529         for (auto channel : channels)
 530         {
 531                 shared_ptr<data::AnalogSegment> segment;
 532
 533                 // Try to get the segment of the channel
 534                 const map< shared_ptr<Channel>, shared_ptr<data::AnalogSegment> >::
 535                         iterator iter = cur_analog_segments_.find(channel);
 536                 if (iter != cur_analog_segments_.end())
 537                         segment = (*iter).second;
 538                 else
 539                 {
 540                         // If no segment was found, this means we havn't
 541                         // created one yet. i.e. this is the first packet
 542                         // in the sweep containing this segment.
 543                         sweep_beginning = true;
 544
 545                         // Get sample limit.
 546                         uint64_t sample_limit;
 547                         try {
 548                                 assert(device_);
 549                                 const std::shared_ptr<sigrok::Device> device =
 550                                         device_->device();
 551                                 assert(device);
 552                                 sample_limit = VariantBase::cast_dynamic<Variant<guint64>>(
 553                                         device->config_get(ConfigKey::LIMIT_SAMPLES)).get();
 554                         } catch (Error) {
 555                                 sample_limit = 0;
 556                         }
 557
 558                         // Create a segment, keep it in the maps of channels
 559                         segment = shared_ptr<data::AnalogSegment>(
 560                                 new data::AnalogSegment(
 561                                         cur_samplerate_, sample_limit));
 562                         cur_analog_segments_[channel] = segment;
 563
 564                         // Find the annalog data associated with the channel
 565                         shared_ptr<view::AnalogSignal> sig =
 566                                 dynamic_pointer_cast<view::AnalogSignal>(
 567                                         signal_from_channel(channel));
 568                         assert(sig);
 569
 570                         shared_ptr<data::Analog> data(sig->analog_data());
 571                         assert(data);
 572
 573                         // Push the segment into the analog data.
 574                         data->push_segment(segment);
 575                 }
 576
 577                 assert(segment);
 578
 579                 // Append the samples in the segment
 580                 segment->append_interleaved_samples(data++, sample_count,
 581                         channel_count);
 582         }
 583
 584         if (sweep_beginning) {
 585                 // This could be the first packet after a trigger
 586                 set_capture_state(Running);
 587         }
 588
 589         data_received();
 590 }
 591
 592 void Session::data_feed_in(shared_ptr<sigrok::Device> device,
 593         shared_ptr<Packet> packet)
 594 {
 595         (void)device;
 596
 597         assert(device);
 598         assert(device == device_->device());
 599         assert(packet);
 600
 601         switch (packet->type()->id()) {
 602         case SR_DF_HEADER:
 603                 feed_in_header();
 604                 break;
 605
 606         case SR_DF_META:
 607                 feed_in_meta(dynamic_pointer_cast<Meta>(packet->payload()));
 608                 break;
 609
 610         case SR_DF_FRAME_BEGIN:
 611                 feed_in_frame_begin();
 612                 break;
 613
 614         case SR_DF_LOGIC:
 615                 feed_in_logic(dynamic_pointer_cast<Logic>(packet->payload()));
 616                 break;
 617
 618         case SR_DF_ANALOG:
 619                 feed_in_analog(dynamic_pointer_cast<Analog>(packet->payload()));
 620                 break;
 621
 622         case SR_DF_END:
 623         {
 624                 {
 625                         lock_guard<mutex> lock(data_mutex_);
 626                         cur_logic_segment_.reset();
 627                         cur_analog_segments_.clear();
 628                 }
 629                 frame_ended();
 630                 break;
 631         }
 632         default:
 633                 break;
 634         }
 635 }
 636
 637 } // namespace pv