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);
298 /** Enumerate available keys, according to a given index key. */
299 vector<const ConfigKey *> config_keys(const ConfigKey *key);
302 struct sr_dev_driver *driver,
303 struct sr_dev_inst *sdi,
304 struct sr_channel_group *channel_group);
305 virtual ~Configurable();
306 struct sr_dev_driver *config_driver;
307 struct sr_dev_inst *config_sdi;
308 struct sr_channel_group *config_channel_group;
311 /** A hardware driver provided by the library */
312 class SR_API Driver :
313 public ParentOwned<Driver, Context, struct sr_dev_driver>,
317 /** Name of this driver. */
319 /** Long name for this driver. */
320 string get_long_name();
321 /** Scan for devices and return a list of devices found.
322 * @param options Mapping of (ConfigKey, value) pairs. */
323 vector<shared_ptr<HardwareDevice> > scan(
324 map<const ConfigKey *, Glib::VariantBase> options = {});
327 vector<HardwareDevice *> devices;
328 Driver(struct sr_dev_driver *structure);
330 friend class Context;
331 friend class HardwareDevice;
332 friend class ChannelGroup;
335 /** A generic device, either hardware or virtual */
336 class SR_API Device : public Configurable
339 /** Description identifying this device. */
340 string get_description();
341 /** Vendor name for this device. */
343 /** Model name for this device. */
345 /** Version string for this device. */
346 string get_version();
347 /** List of the channels available on this device. */
348 vector<shared_ptr<Channel> > get_channels();
349 /** Channel groups available on this device, indexed by name. */
350 map<string, shared_ptr<ChannelGroup> > get_channel_groups();
356 Device(struct sr_dev_inst *structure);
358 virtual shared_ptr<Device> get_shared_from_this() = 0;
359 shared_ptr<Channel> get_channel(struct sr_channel *ptr);
360 struct sr_dev_inst *structure;
361 map<struct sr_channel *, Channel *> channels;
362 map<string, ChannelGroup *> channel_groups;
363 /** Deleter needed to allow shared_ptr use with protected destructor. */
367 void operator()(Device *device) { delete device; }
369 friend class Deleter;
370 friend class Session;
371 friend class Channel;
372 friend class ChannelGroup;
377 /** A real hardware device, connected via a driver */
378 class SR_API HardwareDevice :
379 public ParentOwned<HardwareDevice, Context, struct sr_dev_inst>,
383 /** Driver providing this device. */
384 shared_ptr<Driver> get_driver();
386 HardwareDevice(Driver *driver, struct sr_dev_inst *structure);
388 shared_ptr<Device> get_shared_from_this();
391 friend class ChannelGroup;
394 /** A channel on a device */
395 class SR_API Channel :
396 public ParentOwned<Channel, Device, struct sr_channel>
399 /** Current name of this channel. */
401 /** Set the name of this channel. *
402 * @param name Name string to set. */
403 void set_name(string name);
404 /** Type of this channel. */
405 const ChannelType *get_type();
406 /** Enabled status of this channel. */
408 /** Set the enabled status of this channel.
409 * @param value Boolean value to set. */
410 void set_enabled(bool value);
411 /** Get the index number of this channel. */
412 unsigned int get_index();
414 Channel(struct sr_channel *structure);
416 const ChannelType * const type;
418 friend class ChannelGroup;
419 friend class Session;
420 friend class TriggerStage;
423 /** A group of channels on a device, which share some configuration */
424 class SR_API ChannelGroup :
425 public ParentOwned<ChannelGroup, Device, struct sr_channel_group>,
429 /** Name of this channel group. */
431 /** List of the channels in this group. */
432 vector<shared_ptr<Channel> > get_channels();
434 ChannelGroup(Device *device, struct sr_channel_group *structure);
436 vector<Channel *> channels;
440 /** A trigger configuration */
441 class SR_API Trigger : public UserOwned<Trigger, struct sr_trigger>
444 /** Name of this trigger configuration. */
446 /** List of the stages in this trigger. */
447 vector<shared_ptr<TriggerStage> > get_stages();
448 /** Add a new stage to this trigger. */
449 shared_ptr<TriggerStage> add_stage();
451 Trigger(shared_ptr<Context> context, string name);
453 shared_ptr<Context> context;
454 vector<TriggerStage *> stages;
455 friend class Deleter;
456 friend class Context;
457 friend class Session;
460 /** A stage in a trigger configuration */
461 class SR_API TriggerStage :
462 public ParentOwned<TriggerStage, Trigger, struct sr_trigger_stage>
465 /** Index number of this stage. */
467 /** List of match conditions on this stage. */
468 vector<shared_ptr<TriggerMatch> > get_matches();
469 /** Add a new match condition to this stage.
470 * @param channel Channel to match on.
471 * @param type TriggerMatchType to apply. */
472 void add_match(shared_ptr<Channel> channel, const TriggerMatchType *type);
473 /** Add a new match condition to this stage.
474 * @param channel Channel to match on.
475 * @param type TriggerMatchType to apply.
476 * @param value Threshold value. */
477 void add_match(shared_ptr<Channel> channel, const TriggerMatchType *type, float value);
479 vector<TriggerMatch *> matches;
480 TriggerStage(struct sr_trigger_stage *structure);
482 friend class Trigger;
485 /** A match condition in a trigger configuration */
486 class SR_API TriggerMatch :
487 public ParentOwned<TriggerMatch, TriggerStage, struct sr_trigger_match>
490 /** Channel this condition matches on. */
491 shared_ptr<Channel> get_channel();
492 /** Type of match. */
493 const TriggerMatchType *get_type();
494 /** Threshold value. */
497 TriggerMatch(struct sr_trigger_match *structure, shared_ptr<Channel> channel);
499 shared_ptr<Channel> channel;
500 friend class TriggerStage;
503 /** Type of datafeed callback */
504 typedef function<void(shared_ptr<Device>, shared_ptr<Packet>)>
505 DatafeedCallbackFunction;
507 /* Data required for C callback function to call a C++ datafeed callback */
508 class SR_PRIV DatafeedCallbackData
511 void run(const struct sr_dev_inst *sdi,
512 const struct sr_datafeed_packet *pkt);
514 DatafeedCallbackFunction callback;
515 DatafeedCallbackData(Session *session,
516 DatafeedCallbackFunction callback);
518 friend class Session;
521 /** Type of source callback */
522 typedef function<bool(Glib::IOCondition)>
523 SourceCallbackFunction;
525 /* Data required for C callback function to call a C++ source callback */
526 class SR_PRIV SourceCallbackData
529 bool run(int revents);
531 SourceCallbackData(shared_ptr<EventSource> source);
532 shared_ptr<EventSource> source;
533 friend class Session;
536 /** An I/O event source */
537 class SR_API EventSource
540 /** Create an event source from a file descriptor.
541 * @param fd File descriptor.
542 * @param events GLib IOCondition event mask.
543 * @param timeout Timeout in milliseconds.
544 * @param callback Callback of the form callback(events) */
545 static shared_ptr<EventSource> create(int fd, Glib::IOCondition events,
546 int timeout, SourceCallbackFunction callback);
547 /** Create an event source from a GLib PollFD
548 * @param pollfd GLib PollFD
549 * @param timeout Timeout in milliseconds.
550 * @param callback Callback of the form callback(events) */
551 static shared_ptr<EventSource> create(Glib::PollFD pollfd, int timeout,
552 SourceCallbackFunction callback);
553 /** Create an event source from a GLib IOChannel
554 * @param channel GLib IOChannel.
555 * @param events GLib IOCondition event mask.
556 * @param timeout Timeout in milliseconds.
557 * @param callback Callback of the form callback(events) */
558 static shared_ptr<EventSource> create(
559 Glib::RefPtr<Glib::IOChannel> channel, Glib::IOCondition events,
560 int timeout, SourceCallbackFunction callback);
562 EventSource(int timeout, SourceCallbackFunction callback);
571 Glib::RefPtr<Glib::IOChannel> channel;
572 Glib::IOCondition events;
574 SourceCallbackFunction callback;
575 /** Deleter needed to allow shared_ptr use with protected destructor. */
579 void operator()(EventSource *source) { delete source; }
581 friend class Deleter;
582 friend class Session;
583 friend class SourceCallbackData;
586 /** A sigrok session */
587 class SR_API Session : public UserOwned<Session, struct sr_session>
590 /** Add a device to this session.
591 * @param device Device to add. */
592 void add_device(shared_ptr<Device> device);
593 /** List devices attached to this session. */
594 vector<shared_ptr<Device> > get_devices();
595 /** Remove all devices from this session. */
596 void remove_devices();
597 /** Add a datafeed callback to this session.
598 * @param callback Callback of the form callback(Device, Packet). */
599 void add_datafeed_callback(DatafeedCallbackFunction callback);
600 /** Remove all datafeed callbacks from this session. */
601 void remove_datafeed_callbacks();
602 /** Add an I/O event source.
603 * @param source EventSource to add. */
604 void add_source(shared_ptr<EventSource> source);
605 /** Remove an event source.
606 * @param source EventSource to remove. */
607 void remove_source(shared_ptr<EventSource> source);
608 /** Start the session. */
610 /** Run the session event loop. */
612 /** Stop the session. */
614 /** Begin saving session to a file.
615 * @param filename File name string. */
616 void begin_save(string filename);
617 /** Append a packet to the session file being saved.
618 * @param packet Packet to append. */
619 void append(shared_ptr<Packet> packet);
620 /** Append raw logic data to the session file being saved. */
621 void append(void *data, size_t length, unsigned int unit_size);
622 /** Get current trigger setting. */
623 shared_ptr<Trigger> get_trigger();
624 /** Set trigger setting.
625 * @param trigger Trigger object to use. */
626 void set_trigger(shared_ptr<Trigger> trigger);
628 Session(shared_ptr<Context> context);
629 Session(shared_ptr<Context> context, string filename);
631 const shared_ptr<Context> context;
632 map<const struct sr_dev_inst *, shared_ptr<Device> > devices;
633 vector<DatafeedCallbackData *> datafeed_callbacks;
634 map<shared_ptr<EventSource>, SourceCallbackData *> source_callbacks;
636 bool save_initialized;
637 string save_filename;
638 uint64_t save_samplerate;
639 shared_ptr<Trigger> trigger;
640 friend class Deleter;
641 friend class Context;
642 friend class DatafeedCallbackData;
645 /** A packet on the session datafeed */
646 class SR_API Packet : public UserOwned<Packet, const struct sr_datafeed_packet>
649 /** Type of this packet. */
650 const PacketType *get_type();
651 /** Payload of this packet. */
652 shared_ptr<PacketPayload> get_payload();
654 Packet(shared_ptr<Device> device,
655 const struct sr_datafeed_packet *structure);
657 shared_ptr<Device> device;
658 PacketPayload *payload;
659 friend class Deleter;
660 friend class Session;
662 friend class DatafeedCallbackData;
669 /** Abstract base class for datafeed packet payloads */
670 class SR_API PacketPayload
674 virtual ~PacketPayload() = 0;
675 virtual shared_ptr<PacketPayload> get_shared_pointer(Packet *parent) = 0;
676 /** Deleter needed to allow shared_ptr use with protected destructor. */
680 void operator()(PacketPayload *payload) { delete payload; }
682 friend class Deleter;
687 /** Payload of a datafeed header packet */
688 class SR_API Header :
689 public ParentOwned<Header, Packet, const struct sr_datafeed_header>,
693 /* Feed version number. */
694 int get_feed_version();
695 /* Start time of this session. */
696 Glib::TimeVal get_start_time();
698 Header(const struct sr_datafeed_header *structure);
700 shared_ptr<PacketPayload> get_shared_pointer(Packet *parent);
704 /** Payload of a datafeed metadata packet */
706 public ParentOwned<Meta, Packet, const struct sr_datafeed_meta>,
710 /* Mapping of (ConfigKey, value) pairs. */
711 map<const ConfigKey *, Glib::VariantBase> get_config();
713 Meta(const struct sr_datafeed_meta *structure);
715 shared_ptr<PacketPayload> get_shared_pointer(Packet *parent);
716 map<const ConfigKey *, Glib::VariantBase> config;
720 /** Payload of a datafeed packet with logic data */
722 public ParentOwned<Logic, Packet, const struct sr_datafeed_logic>,
726 /* Pointer to data. */
727 void *get_data_pointer();
728 /* Data length in bytes. */
729 size_t get_data_length();
730 /* Size of each sample in bytes. */
731 unsigned int get_unit_size();
733 Logic(const struct sr_datafeed_logic *structure);
735 shared_ptr<PacketPayload> get_shared_pointer(Packet *parent);
739 /** Payload of a datafeed packet with analog data */
740 class SR_API Analog :
741 public ParentOwned<Analog, Packet, const struct sr_datafeed_analog>,
745 /** Pointer to data. */
746 float *get_data_pointer();
747 /** Number of samples in this packet. */
748 unsigned int get_num_samples();
749 /** Channels for which this packet contains data. */
750 vector<shared_ptr<Channel> > get_channels();
751 /** Measured quantity of the samples in this packet. */
752 const Quantity *get_mq();
753 /** Unit of the samples in this packet. */
754 const Unit *get_unit();
755 /** Measurement flags associated with the samples in this packet. */
756 vector<const QuantityFlag *> get_mq_flags();
758 Analog(const struct sr_datafeed_analog *structure);
760 shared_ptr<PacketPayload> get_shared_pointer(Packet *parent);
764 /** An input format supported by the library */
765 class SR_API InputFormat :
766 public ParentOwned<InputFormat, Context, const struct sr_input_module>
769 /** Name of this input format. */
771 /** Description of this input format. */
772 string get_description();
773 /** Options supported by this input format. */
774 map<string, shared_ptr<Option> > get_options();
775 /** Create an input using this input format.
776 * @param options Mapping of (option name, value) pairs. */
777 shared_ptr<Input> create_input(map<string, Glib::VariantBase> options = {});
779 InputFormat(const struct sr_input_module *structure);
781 friend class Context;
782 friend class InputDevice;
785 /** An input instance (an input format applied to a file or stream) */
786 class SR_API Input : public UserOwned<Input, const struct sr_input>
789 /** Virtual device associated with this input. */
790 shared_ptr<InputDevice> get_device();
791 /** Send next stream data.
792 * @param data Next stream data. */
793 void send(string data);
795 Input(shared_ptr<Context> context, const struct sr_input *structure);
797 shared_ptr<Context> context;
799 friend class Deleter;
800 friend class Context;
801 friend class InputFormat;
804 /** A virtual device associated with an input */
805 class SR_API InputDevice :
806 public ParentOwned<InputDevice, Input, struct sr_dev_inst>,
810 InputDevice(shared_ptr<Input> input, struct sr_dev_inst *sdi);
812 shared_ptr<Device> get_shared_from_this();
813 shared_ptr<Input> input;
817 /** An option used by an output format */
818 class SR_API Option : public UserOwned<Option, const struct sr_option>
821 /** Short name of this option suitable for command line usage. */
823 /** Short name of this option suitable for GUI usage. */
825 /** Description of this option in a sentence. */
826 string get_description();
827 /** Default value for this option. */
828 Glib::VariantBase get_default_value();
829 /** Possible values for this option, if a limited set. */
830 vector<Glib::VariantBase> get_values();
832 Option(const struct sr_option *structure,
833 shared_ptr<const struct sr_option *> structure_array);
835 shared_ptr<const struct sr_option *> structure_array;
836 friend class Deleter;
837 friend class InputFormat;
838 friend class OutputFormat;
841 /** An output format supported by the library */
842 class SR_API OutputFormat :
843 public ParentOwned<OutputFormat, Context, const struct sr_output_module>
846 /** Name of this output format. */
848 /** Description of this output format. */
849 string get_description();
850 /** Options supported by this output format. */
851 map<string, shared_ptr<Option> > get_options();
852 /** Create an output using this format.
853 * @param device Device to output for.
854 * @param options Mapping of (option name, value) pairs. */
855 shared_ptr<Output> create_output(shared_ptr<Device> device,
856 map<string, Glib::VariantBase> options = {});
858 OutputFormat(const struct sr_output_module *structure);
860 friend class Context;
864 /** An output instance (an output format applied to a device) */
865 class SR_API Output : public UserOwned<Output, const struct sr_output>
868 /** Update output with data from the given packet.
869 * @param packet Packet to handle. */
870 string receive(shared_ptr<Packet> packet);
872 Output(shared_ptr<OutputFormat> format, shared_ptr<Device> device);
873 Output(shared_ptr<OutputFormat> format,
874 shared_ptr<Device> device, map<string, Glib::VariantBase> options);
876 const shared_ptr<OutputFormat> format;
877 const shared_ptr<Device> device;
878 const map<string, Glib::VariantBase> options;
879 friend class Deleter;
880 friend class OutputFormat;
883 /** Base class for objects which wrap an enumeration value from libsigrok */
884 template <typename T> class SR_API EnumValue
887 /** The enum constant associated with this value. */
888 T get_id() const { return id; }
889 /** The name associated with this value. */
890 string get_name() const { return name; }
892 EnumValue(T id, const char name[]) : id(id), name(name) {}
902 #endif // LIBSIGROK_HPP