2 * This file is part of the libsigrok project.
4 * Copyright (C) 2013-2014 Martin Ling <martin-sigrok@earth.li>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
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.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
22 @mainpage API Reference
27 The sigrok++ API provides an object-oriented C++ interface to the functionality
28 in libsigrok, including automatic memory and resource management.
30 It is built on top of the public libsigrok C API, and is designed to be used as
31 a standalone alternative API. Programs should not mix usage of the C and C++
32 APIs; the C++ interface code needs to have full control of all C API calls for
33 resources to be managed correctly.
38 All runtime objects created through the C++ API are passed and accessed via
39 shared pointers, using the C++11 std::shared_ptr implementation. This means
40 that a reference count is kept for each object.
42 Shared pointers can be copied and assigned in a user's program, automatically
43 updating their reference count and deleting objects when they are no longer in
44 use. The C++ interface code also keeps track of internal dependencies between
45 libsigrok resources, and ensures that objects are not prematurely deleted when
46 their resources are in use by other objects.
48 This means that management of sigrok++ objects and their underlying libsigrok
49 resources can be treated as fully automatic. As long as all shared pointers to
50 objects are deleted or reassigned when no longer in use, all underlying
51 resources will be released at the right time.
56 Usage of the C++ API needs to begin with a call to sigrok::Context::create().
57 This will create the global libsigrok context and returns a shared pointer to
58 the sigrok::Context object. Methods on this object provide access to the
59 hardware drivers, input and output formats supported by the library, as well
60 as means of creating other objects such as sessions and triggers.
65 When any libsigrok C API call returns an error, a sigrok::Error exception is
66 raised, which provides access to the error code and description.
73 #include "libsigrok/libsigrok.h"
74 #include <glibmm-2.4/glibmm.h>
86 /* Forward declarations */
91 class SR_API HardwareDevice;
93 class SR_API EventSource;
95 class SR_API ConfigKey;
96 class SR_API InputFormat;
97 class SR_API OutputFormat;
98 class SR_API LogLevel;
99 class SR_API ChannelGroup;
100 class SR_API Trigger;
101 class SR_API TriggerStage;
102 class SR_API TriggerMatch;
103 class SR_API TriggerMatchType;
104 class SR_API ChannelType;
106 class SR_API PacketPayload;
107 class SR_API PacketType;
108 class SR_API Quantity;
110 class SR_API QuantityFlag;
112 class SR_API InputDevice;
114 class SR_API DataType;
117 /** Exception thrown when an error code is returned by any libsigrok call. */
118 class SR_API Error: public exception
124 const char *what() const throw();
127 /* Base template for classes whose resources are owned by a parent object. */
128 template <class Class, class Parent, typename Struct>
129 class SR_API ParentOwned
132 /* Parent object which owns this child object's underlying structure.
134 This shared pointer will be null when this child is unused, but
135 will be assigned to point to the parent before any shared pointer
136 to this child is handed out to the user.
138 When the reference count of this child falls to zero, this shared
139 pointer to its parent is reset by a custom deleter on the child's
142 This strategy ensures that the destructors for both the child and
143 the parent are called at the correct time, i.e. only when all
144 references to both the parent and all its children are gone. */
145 shared_ptr<Parent> parent;
147 /* Weak pointer for shared_from_this() implementation. */
148 weak_ptr<Class> weak_this;
151 /* Note, this implementation will create a new smart_ptr if none exists. */
152 shared_ptr<Class> shared_from_this()
154 shared_ptr<Class> shared;
156 if (!(shared = weak_this.lock()))
158 shared = shared_ptr<Class>((Class *) this, reset_parent);
165 shared_ptr<Class> get_shared_pointer(shared_ptr<Parent> parent)
168 throw Error(SR_ERR_BUG);
169 this->parent = parent;
170 return shared_from_this();
173 shared_ptr<Class> get_shared_pointer(Parent *parent)
176 throw Error(SR_ERR_BUG);
177 return get_shared_pointer(parent->shared_from_this());
180 static void reset_parent(Class *object)
183 throw Error(SR_ERR_BUG);
184 object->parent.reset();
189 ParentOwned<Class, Parent, Struct>(Struct *structure) :
195 /* Base template for classes whose resources are owned by the user. */
196 template <class Class, typename Struct>
197 class SR_API UserOwned : public enable_shared_from_this<Class>
200 shared_ptr<Class> shared_from_this()
202 auto shared = enable_shared_from_this<Class>::shared_from_this();
204 throw Error(SR_ERR_BUG);
210 UserOwned<Class, Struct>(Struct *structure) :
215 /* Deleter needed to allow shared_ptr use with protected destructor. */
219 void operator()(Class *object) { delete object; }
223 /** Type of log callback */
224 typedef function<void(const LogLevel *, string message)> LogCallbackFunction;
226 /** The global libsigrok context */
227 class SR_API Context : public UserOwned<Context, struct sr_context>
230 /** Create new context */
231 static shared_ptr<Context> create();
232 /** libsigrok package version. */
233 string get_package_version();
234 /** libsigrok library version. */
235 string get_lib_version();
236 /** Available hardware drivers, indexed by name. */
237 map<string, shared_ptr<Driver> > get_drivers();
238 /** Available input formats, indexed by name. */
239 map<string, shared_ptr<InputFormat> > get_input_formats();
240 /** Available output formats, indexed by name. */
241 map<string, shared_ptr<OutputFormat> > get_output_formats();
242 /** Current log level. */
243 const LogLevel *get_log_level();
244 /** Set the log level.
245 * @param level LogLevel to use. */
246 void set_log_level(const LogLevel *level);
247 /** Current log domain. */
248 string get_log_domain();
249 /** Set the log domain.
250 * @param value Log domain prefix string. */
251 void set_log_domain(string value);
252 /** Set the log callback.
253 * @param callback Callback of the form callback(LogLevel, string). */
254 void set_log_callback(LogCallbackFunction callback);
255 /** Set the log callback to the default handler. */
256 void set_log_callback_default();
257 /** Create a new session. */
258 shared_ptr<Session> create_session();
259 /** Load a saved session.
260 * @param filename File name string. */
261 shared_ptr<Session> load_session(string filename);
262 /** Create a new trigger.
263 * @param name Name string for new trigger. */
264 shared_ptr<Trigger> create_trigger(string name);
265 /** Open an input file.
266 * @param filename File name string. */
267 shared_ptr<Input> open_file(string filename);
268 /** Open an input stream based on header data.
269 * @param header Initial data from stream. */
270 shared_ptr<Input> open_stream(string header);
272 map<string, Driver *> drivers;
273 map<string, InputFormat *> input_formats;
274 map<string, OutputFormat *> output_formats;
276 LogCallbackFunction log_callback;
279 friend class Deleter;
280 friend class Session;
284 /** An object that can be configured. */
285 class SR_API Configurable
288 /** Read configuration for the given key.
289 * @param key ConfigKey to read. */
290 Glib::VariantBase config_get(const ConfigKey *key);
291 /** Set configuration for the given key to a specified value.
292 * @param key ConfigKey to set.
293 * @param value Value to set. */
294 void config_set(const ConfigKey *key, Glib::VariantBase value);
295 /** Enumerate available values for the given configuration key.
296 * @param key ConfigKey to enumerate values for. */
297 Glib::VariantContainerBase config_list(const ConfigKey *key);
300 struct sr_dev_driver *driver,
301 struct sr_dev_inst *sdi,
302 struct sr_channel_group *channel_group);
303 virtual ~Configurable();
304 struct sr_dev_driver *config_driver;
305 struct sr_dev_inst *config_sdi;
306 struct sr_channel_group *config_channel_group;
309 /** A hardware driver provided by the library */
310 class SR_API Driver :
311 public ParentOwned<Driver, Context, struct sr_dev_driver>,
315 /** Name of this driver. */
317 /** Long name for this driver. */
318 string get_long_name();
319 /** Scan for devices and return a list of devices found.
320 * @param options Mapping of (ConfigKey, value) pairs. */
321 vector<shared_ptr<HardwareDevice> > scan(
322 map<const ConfigKey *, Glib::VariantBase> options = {});
325 vector<HardwareDevice *> devices;
326 Driver(struct sr_dev_driver *structure);
328 friend class Context;
329 friend class HardwareDevice;
330 friend class ChannelGroup;
333 /** A generic device, either hardware or virtual */
334 class SR_API Device : public Configurable
337 /** Description identifying this device. */
338 string get_description();
339 /** Vendor name for this device. */
341 /** Model name for this device. */
343 /** Version string for this device. */
344 string get_version();
345 /** List of the channels available on this device. */
346 vector<shared_ptr<Channel> > get_channels();
347 /** Channel groups available on this device, indexed by name. */
348 map<string, shared_ptr<ChannelGroup> > get_channel_groups();
354 Device(struct sr_dev_inst *structure);
356 virtual shared_ptr<Device> get_shared_from_this() = 0;
357 shared_ptr<Channel> get_channel(struct sr_channel *ptr);
358 struct sr_dev_inst *structure;
359 map<struct sr_channel *, Channel *> channels;
360 map<string, ChannelGroup *> channel_groups;
361 /** Deleter needed to allow shared_ptr use with protected destructor. */
365 void operator()(Device *device) { delete device; }
367 friend class Deleter;
368 friend class Session;
369 friend class Channel;
370 friend class ChannelGroup;
375 /** A real hardware device, connected via a driver */
376 class SR_API HardwareDevice :
377 public ParentOwned<HardwareDevice, Context, struct sr_dev_inst>,
381 /** Driver providing this device. */
382 shared_ptr<Driver> get_driver();
384 HardwareDevice(Driver *driver, struct sr_dev_inst *structure);
386 shared_ptr<Device> get_shared_from_this();
389 friend class ChannelGroup;
392 /** A channel on a device */
393 class SR_API Channel :
394 public ParentOwned<Channel, Device, struct sr_channel>
397 /** Current name of this channel. */
399 /** Set the name of this channel. *
400 * @param name Name string to set. */
401 void set_name(string name);
402 /** Type of this channel. */
403 const ChannelType *get_type();
404 /** Enabled status of this channel. */
406 /** Set the enabled status of this channel.
407 * @param value Boolean value to set. */
408 void set_enabled(bool value);
409 /** Get the index number of this channel. */
410 unsigned int get_index();
412 Channel(struct sr_channel *structure);
414 const ChannelType * const type;
416 friend class ChannelGroup;
417 friend class Session;
418 friend class TriggerStage;
421 /** A group of channels on a device, which share some configuration */
422 class SR_API ChannelGroup :
423 public ParentOwned<ChannelGroup, Device, struct sr_channel_group>,
427 /** Name of this channel group. */
429 /** List of the channels in this group. */
430 vector<shared_ptr<Channel> > get_channels();
432 ChannelGroup(Device *device, struct sr_channel_group *structure);
434 vector<Channel *> channels;
438 /** A trigger configuration */
439 class SR_API Trigger : public UserOwned<Trigger, struct sr_trigger>
442 /** Name of this trigger configuration. */
444 /** List of the stages in this trigger. */
445 vector<shared_ptr<TriggerStage> > get_stages();
446 /** Add a new stage to this trigger. */
447 shared_ptr<TriggerStage> add_stage();
449 Trigger(shared_ptr<Context> context, string name);
451 shared_ptr<Context> context;
452 vector<TriggerStage *> stages;
453 friend class Deleter;
454 friend class Context;
455 friend class Session;
458 /** A stage in a trigger configuration */
459 class SR_API TriggerStage :
460 public ParentOwned<TriggerStage, Trigger, struct sr_trigger_stage>
463 /** Index number of this stage. */
465 /** List of match conditions on this stage. */
466 vector<shared_ptr<TriggerMatch> > get_matches();
467 /** Add a new match condition to this stage.
468 * @param channel Channel to match on.
469 * @param type TriggerMatchType to apply. */
470 void add_match(shared_ptr<Channel> channel, const TriggerMatchType *type);
471 /** Add a new match condition to this stage.
472 * @param channel Channel to match on.
473 * @param type TriggerMatchType to apply.
474 * @param value Threshold value. */
475 void add_match(shared_ptr<Channel> channel, const TriggerMatchType *type, float value);
477 vector<TriggerMatch *> matches;
478 TriggerStage(struct sr_trigger_stage *structure);
480 friend class Trigger;
483 /** A match condition in a trigger configuration */
484 class SR_API TriggerMatch :
485 public ParentOwned<TriggerMatch, TriggerStage, struct sr_trigger_match>
488 /** Channel this condition matches on. */
489 shared_ptr<Channel> get_channel();
490 /** Type of match. */
491 const TriggerMatchType *get_type();
492 /** Threshold value. */
495 TriggerMatch(struct sr_trigger_match *structure, shared_ptr<Channel> channel);
497 shared_ptr<Channel> channel;
498 friend class TriggerStage;
501 /** Type of datafeed callback */
502 typedef function<void(shared_ptr<Device>, shared_ptr<Packet>)>
503 DatafeedCallbackFunction;
505 /* Data required for C callback function to call a C++ datafeed callback */
506 class SR_PRIV DatafeedCallbackData
509 void run(const struct sr_dev_inst *sdi,
510 const struct sr_datafeed_packet *pkt);
512 DatafeedCallbackFunction callback;
513 DatafeedCallbackData(Session *session,
514 DatafeedCallbackFunction callback);
516 friend class Session;
519 /** Type of source callback */
520 typedef function<bool(Glib::IOCondition)>
521 SourceCallbackFunction;
523 /* Data required for C callback function to call a C++ source callback */
524 class SR_PRIV SourceCallbackData
527 bool run(int revents);
529 SourceCallbackData(shared_ptr<EventSource> source);
530 shared_ptr<EventSource> source;
531 friend class Session;
534 /** An I/O event source */
535 class SR_API EventSource
538 /** Create an event source from a file descriptor.
539 * @param fd File descriptor.
540 * @param events GLib IOCondition event mask.
541 * @param timeout Timeout in milliseconds.
542 * @param callback Callback of the form callback(events) */
543 static shared_ptr<EventSource> create(int fd, Glib::IOCondition events,
544 int timeout, SourceCallbackFunction callback);
545 /** Create an event source from a GLib PollFD
546 * @param pollfd GLib PollFD
547 * @param timeout Timeout in milliseconds.
548 * @param callback Callback of the form callback(events) */
549 static shared_ptr<EventSource> create(Glib::PollFD pollfd, int timeout,
550 SourceCallbackFunction callback);
551 /** Create an event source from a GLib IOChannel
552 * @param channel GLib IOChannel.
553 * @param events GLib IOCondition event mask.
554 * @param timeout Timeout in milliseconds.
555 * @param callback Callback of the form callback(events) */
556 static shared_ptr<EventSource> create(
557 Glib::RefPtr<Glib::IOChannel> channel, Glib::IOCondition events,
558 int timeout, SourceCallbackFunction callback);
560 EventSource(int timeout, SourceCallbackFunction callback);
569 Glib::RefPtr<Glib::IOChannel> channel;
570 Glib::IOCondition events;
572 SourceCallbackFunction callback;
573 /** Deleter needed to allow shared_ptr use with protected destructor. */
577 void operator()(EventSource *source) { delete source; }
579 friend class Deleter;
580 friend class Session;
581 friend class SourceCallbackData;
584 /** A sigrok session */
585 class SR_API Session : public UserOwned<Session, struct sr_session>
588 /** Add a device to this session.
589 * @param device Device to add. */
590 void add_device(shared_ptr<Device> device);
591 /** List devices attached to this session. */
592 vector<shared_ptr<Device> > get_devices();
593 /** Remove all devices from this session. */
594 void remove_devices();
595 /** Add a datafeed callback to this session.
596 * @param callback Callback of the form callback(Device, Packet). */
597 void add_datafeed_callback(DatafeedCallbackFunction callback);
598 /** Remove all datafeed callbacks from this session. */
599 void remove_datafeed_callbacks();
600 /** Add an I/O event source.
601 * @param source EventSource to add. */
602 void add_source(shared_ptr<EventSource> source);
603 /** Remove an event source.
604 * @param source EventSource to remove. */
605 void remove_source(shared_ptr<EventSource> source);
606 /** Start the session. */
608 /** Run the session event loop. */
610 /** Stop the session. */
612 /** Begin saving session to a file.
613 * @param filename File name string. */
614 void begin_save(string filename);
615 /** Append a packet to the session file being saved.
616 * @param packet Packet to append. */
617 void append(shared_ptr<Packet> packet);
618 /** Append raw logic data to the session file being saved. */
619 void append(void *data, size_t length, unsigned int unit_size);
620 /** Get current trigger setting. */
621 shared_ptr<Trigger> get_trigger();
622 /** Set trigger setting.
623 * @param trigger Trigger object to use. */
624 void set_trigger(shared_ptr<Trigger> trigger);
626 Session(shared_ptr<Context> context);
627 Session(shared_ptr<Context> context, string filename);
629 const shared_ptr<Context> context;
630 map<const struct sr_dev_inst *, shared_ptr<Device> > devices;
631 vector<DatafeedCallbackData *> datafeed_callbacks;
632 map<shared_ptr<EventSource>, SourceCallbackData *> source_callbacks;
634 bool save_initialized;
635 string save_filename;
636 uint64_t save_samplerate;
637 shared_ptr<Trigger> trigger;
638 friend class Deleter;
639 friend class Context;
640 friend class DatafeedCallbackData;
643 /** A packet on the session datafeed */
644 class SR_API Packet : public UserOwned<Packet, const struct sr_datafeed_packet>
647 /** Type of this packet. */
648 const PacketType *get_type();
649 /** Payload of this packet. */
650 shared_ptr<PacketPayload> get_payload();
652 Packet(shared_ptr<Device> device,
653 const struct sr_datafeed_packet *structure);
655 shared_ptr<Device> device;
656 PacketPayload *payload;
657 friend class Deleter;
658 friend class Session;
660 friend class DatafeedCallbackData;
667 /** Abstract base class for datafeed packet payloads */
668 class SR_API PacketPayload
672 virtual ~PacketPayload() = 0;
673 virtual shared_ptr<PacketPayload> get_shared_pointer(Packet *parent) = 0;
674 /** Deleter needed to allow shared_ptr use with protected destructor. */
678 void operator()(PacketPayload *payload) { delete payload; }
680 friend class Deleter;
685 /** Payload of a datafeed header packet */
686 class SR_API Header :
687 public ParentOwned<Header, Packet, const struct sr_datafeed_header>,
691 /* Feed version number. */
692 int get_feed_version();
693 /* Start time of this session. */
694 Glib::TimeVal get_start_time();
696 Header(const struct sr_datafeed_header *structure);
698 shared_ptr<PacketPayload> get_shared_pointer(Packet *parent);
702 /** Payload of a datafeed metadata packet */
704 public ParentOwned<Meta, Packet, const struct sr_datafeed_meta>,
708 /* Mapping of (ConfigKey, value) pairs. */
709 map<const ConfigKey *, Glib::VariantBase> get_config();
711 Meta(const struct sr_datafeed_meta *structure);
713 shared_ptr<PacketPayload> get_shared_pointer(Packet *parent);
714 map<const ConfigKey *, Glib::VariantBase> config;
718 /** Payload of a datafeed packet with logic data */
720 public ParentOwned<Logic, Packet, const struct sr_datafeed_logic>,
724 /* Pointer to data. */
725 void *get_data_pointer();
726 /* Data length in bytes. */
727 size_t get_data_length();
728 /* Size of each sample in bytes. */
729 unsigned int get_unit_size();
731 Logic(const struct sr_datafeed_logic *structure);
733 shared_ptr<PacketPayload> get_shared_pointer(Packet *parent);
737 /** Payload of a datafeed packet with analog data */
738 class SR_API Analog :
739 public ParentOwned<Analog, Packet, const struct sr_datafeed_analog>,
743 /** Pointer to data. */
744 float *get_data_pointer();
745 /** Number of samples in this packet. */
746 unsigned int get_num_samples();
747 /** Channels for which this packet contains data. */
748 vector<shared_ptr<Channel> > get_channels();
749 /** Measured quantity of the samples in this packet. */
750 const Quantity *get_mq();
751 /** Unit of the samples in this packet. */
752 const Unit *get_unit();
753 /** Measurement flags associated with the samples in this packet. */
754 vector<const QuantityFlag *> get_mq_flags();
756 Analog(const struct sr_datafeed_analog *structure);
758 shared_ptr<PacketPayload> get_shared_pointer(Packet *parent);
762 /** An input format supported by the library */
763 class SR_API InputFormat :
764 public ParentOwned<InputFormat, Context, const struct sr_input_module>
767 /** Name of this input format. */
769 /** Description of this input format. */
770 string get_description();
771 /** Options supported by this input format. */
772 map<string, shared_ptr<Option> > get_options();
773 /** Create an input using this input format.
774 * @param options Mapping of (option name, value) pairs. */
775 shared_ptr<Input> create_input(map<string, Glib::VariantBase> options = {});
777 InputFormat(const struct sr_input_module *structure);
779 friend class Context;
780 friend class InputDevice;
783 /** An input instance (an input format applied to a file or stream) */
784 class SR_API Input : public UserOwned<Input, const struct sr_input>
787 /** Virtual device associated with this input. */
788 shared_ptr<InputDevice> get_device();
789 /** Send next stream data.
790 * @param data Next stream data. */
791 void send(string data);
793 Input(shared_ptr<Context> context, const struct sr_input *structure);
795 shared_ptr<Context> context;
797 friend class Deleter;
798 friend class Context;
799 friend class InputFormat;
802 /** A virtual device associated with an input */
803 class SR_API InputDevice :
804 public ParentOwned<InputDevice, Input, struct sr_dev_inst>,
808 InputDevice(shared_ptr<Input> input, struct sr_dev_inst *sdi);
810 shared_ptr<Device> get_shared_from_this();
811 shared_ptr<Input> input;
815 /** An option used by an output format */
816 class SR_API Option : public UserOwned<Option, const struct sr_option>
819 /** Short name of this option suitable for command line usage. */
821 /** Short name of this option suitable for GUI usage. */
823 /** Description of this option in a sentence. */
824 string get_description();
825 /** Default value for this option. */
826 Glib::VariantBase get_default_value();
827 /** Possible values for this option, if a limited set. */
828 vector<Glib::VariantBase> get_values();
830 Option(const struct sr_option *structure,
831 shared_ptr<const struct sr_option *> structure_array);
833 shared_ptr<const struct sr_option *> structure_array;
834 friend class Deleter;
835 friend class InputFormat;
836 friend class OutputFormat;
839 /** An output format supported by the library */
840 class SR_API OutputFormat :
841 public ParentOwned<OutputFormat, Context, const struct sr_output_module>
844 /** Name of this output format. */
846 /** Description of this output format. */
847 string get_description();
848 /** Options supported by this output format. */
849 map<string, shared_ptr<Option> > get_options();
850 /** Create an output using this format.
851 * @param device Device to output for.
852 * @param options Mapping of (option name, value) pairs. */
853 shared_ptr<Output> create_output(shared_ptr<Device> device,
854 map<string, Glib::VariantBase> options = {});
856 OutputFormat(const struct sr_output_module *structure);
858 friend class Context;
862 /** An output instance (an output format applied to a device) */
863 class SR_API Output : public UserOwned<Output, const struct sr_output>
866 /** Update output with data from the given packet.
867 * @param packet Packet to handle. */
868 string receive(shared_ptr<Packet> packet);
870 Output(shared_ptr<OutputFormat> format, shared_ptr<Device> device);
871 Output(shared_ptr<OutputFormat> format,
872 shared_ptr<Device> device, map<string, Glib::VariantBase> options);
874 const shared_ptr<OutputFormat> format;
875 const shared_ptr<Device> device;
876 const map<string, Glib::VariantBase> options;
877 friend class Deleter;
878 friend class OutputFormat;
881 /** Base class for objects which wrap an enumeration value from libsigrok */
882 template <typename T> class SR_API EnumValue
885 /** The enum constant associated with this value. */
886 T get_id() const { return id; }
887 /** The name associated with this value. */
888 string get_name() const { return name; }
890 EnumValue(T id, const char name[]) : id(id), name(name) {}
900 #endif // LIBSIGROK_HPP