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;
111 class SR_API InputFileDevice;
113 class SR_API DataType;
115 /** Exception thrown when an error code is returned by any libsigrok call. */
116 class SR_API Error: public exception
122 const char *what() const throw();
125 /* Base template for most classes which wrap a struct type from libsigrok. */
126 template <class Parent, typename Struct> class SR_API StructureWrapper :
127 public enable_shared_from_this<StructureWrapper<Parent, Struct> >
130 /* Parent object which owns this child object's underlying structure.
132 This shared pointer will be null when this child is unused, but
133 will be assigned to point to the parent before any shared pointer
134 to this child is handed out to the user.
136 When the reference count of this child falls to zero, this shared
137 pointer to its parent is reset by a custom deleter on the child's
140 This strategy ensures that the destructors for both the child and
141 the parent are called at the correct time, i.e. only when all
142 references to both the parent and all its children are gone. */
143 shared_ptr<Parent> parent;
146 shared_ptr<StructureWrapper<Parent, Struct> >
147 get_shared_pointer(Parent *parent)
149 this->parent = static_pointer_cast<Parent>(parent->shared_from_this());
150 return shared_ptr<StructureWrapper<Parent, Struct> >(
153 shared_ptr<StructureWrapper<Parent, Struct> >
154 get_shared_pointer(shared_ptr<Parent> parent)
156 this->parent = parent;
157 return shared_ptr<StructureWrapper<Parent, Struct> >(
161 static void reset_parent(StructureWrapper<Parent, Struct> *object)
163 object->parent.reset();
168 StructureWrapper<Parent, Struct>(Struct *structure) :
174 /** Type of log callback */
175 typedef function<void(const LogLevel *, string message)> LogCallbackFunction;
177 /** The global libsigrok context */
178 class SR_API Context : public enable_shared_from_this<Context>
181 /** Create new context */
182 static shared_ptr<Context> create();
183 /** libsigrok package version. */
184 string get_package_version();
185 /** libsigrok library version. */
186 string get_lib_version();
187 /** Available hardware drivers, indexed by name. */
188 map<string, shared_ptr<Driver> > get_drivers();
189 /** Available input formats, indexed by name. */
190 map<string, shared_ptr<InputFormat> > get_input_formats();
191 /** Available output formats, indexed by name. */
192 map<string, shared_ptr<OutputFormat> > get_output_formats();
193 /** Current log level. */
194 const LogLevel *get_log_level();
195 /** Set the log level. */
196 void set_log_level(const LogLevel *level);
197 /** Current log domain. */
198 string get_log_domain();
199 /** Set the log domain. */
200 void set_log_domain(string value);
201 /** Set the log callback. */
202 void set_log_callback(LogCallbackFunction callback);
203 /** Set the log callback to the default handler. */
204 void set_log_callback_default();
205 /** Create a new session. */
206 shared_ptr<Session> create_session();
207 /** Load a saved session. */
208 shared_ptr<Session> load_session(string filename);
209 /** Create a new trigger. */
210 shared_ptr<Trigger> create_trigger(string name);
212 struct sr_context *structure;
213 map<string, Driver *> drivers;
214 map<string, InputFormat *> input_formats;
215 map<string, OutputFormat *> output_formats;
217 LogCallbackFunction log_callback;
220 /** Deleter needed to allow shared_ptr use with protected destructor. */
224 void operator()(Context *context) { delete context; }
226 friend class Deleter;
227 friend class Session;
231 /** A hardware driver provided by the library */
232 class SR_API Driver : public StructureWrapper<Context, struct sr_dev_driver>
235 /** Name of this driver. */
237 /** Long name for this driver. */
238 string get_long_name();
239 /** Scan for devices and return a list of devices found. */
240 vector<shared_ptr<HardwareDevice> > scan(
241 map<const ConfigKey *, Glib::VariantBase> options = {});
244 vector<HardwareDevice *> devices;
245 Driver(struct sr_dev_driver *structure);
247 friend class Context;
248 friend class HardwareDevice;
249 friend class ChannelGroup;
252 /** An object that can be configured. */
253 class SR_API Configurable
256 /** Read configuration for the given key. */
257 Glib::VariantBase config_get(const ConfigKey *key);
258 /** Set configuration for the given key to a specified value. */
259 void config_set(const ConfigKey *key, Glib::VariantBase value);
260 /** Enumerate available values for the given configuration key. */
261 Glib::VariantBase config_list(const ConfigKey *key);
264 struct sr_dev_driver *driver,
265 struct sr_dev_inst *sdi,
266 struct sr_channel_group *channel_group);
267 virtual ~Configurable();
268 struct sr_dev_driver *config_driver;
269 struct sr_dev_inst *config_sdi;
270 struct sr_channel_group *config_channel_group;
273 /** A generic device, either hardware or virtual */
274 class SR_API Device :
276 public StructureWrapper<Context, struct sr_dev_inst>
279 /** Vendor name for this device. */
281 /** Model name for this device. */
283 /** Version string for this device. */
284 string get_version();
285 /** List of the channels available on this device. */
286 vector<shared_ptr<Channel> > get_channels();
292 Device(struct sr_dev_inst *structure);
294 vector<Channel *> channels;
295 /** Deleter needed to allow shared_ptr use with protected destructor. */
299 void operator()(Device *device) { delete device; }
301 friend class Deleter;
302 friend class Session;
303 friend class Channel;
304 friend class ChannelGroup;
308 /** A real hardware device, connected via a driver */
309 class SR_API HardwareDevice : public Device
312 /** Driver providing this device. */
313 shared_ptr<Driver> get_driver();
314 /** Channel groups available on this device, indexed by name. */
315 map<string, shared_ptr<ChannelGroup> > get_channel_groups();
317 HardwareDevice(Driver *driver, struct sr_dev_inst *structure);
320 map<string, ChannelGroup *> channel_groups;
322 friend class ChannelGroup;
325 /** A channel on a device */
326 class SR_API Channel : public StructureWrapper<Device, struct sr_channel>
329 /** Current name of this channel. */
331 /** Set the name of this channel. */
332 void set_name(string name);
333 /** Type of this channel. */
334 const ChannelType *get_type();
335 /** Enabled status of this channel. */
337 /** Set the enabled status of this channel. */
338 void set_enabled(bool value);
340 Channel(struct sr_channel *structure);
342 const ChannelType * const type;
344 friend class ChannelGroup;
345 friend class Session;
346 friend class TriggerStage;
349 /** A group of channels on a device, which share some configuration */
350 class SR_API ChannelGroup :
351 public StructureWrapper<HardwareDevice, struct sr_channel_group>,
355 /** Name of this channel group. */
357 /** List of the channels in this group. */
358 vector<shared_ptr<Channel> > get_channels();
360 ChannelGroup(HardwareDevice *device, struct sr_channel_group *structure);
362 vector<Channel *> channels;
363 friend class HardwareDevice;
366 /** A trigger configuration */
367 class SR_API Trigger : public enable_shared_from_this<Trigger>
371 vector<shared_ptr<TriggerStage> > get_stages();
372 shared_ptr<TriggerStage> add_stage();
374 Trigger(shared_ptr<Context> context, string name);
376 struct sr_trigger *structure;
377 shared_ptr<Context> context;
378 vector<TriggerStage *> stages;
379 /** Deleter needed to allow shared_ptr use with protected destructor. */
383 void operator()(Trigger *trigger) { delete trigger; }
385 friend class Context;
386 friend class Session;
389 /** A stage in a trigger configuration */
390 class SR_API TriggerStage : public StructureWrapper<Trigger, struct sr_trigger_stage>
394 vector<shared_ptr<TriggerMatch> > get_matches();
395 void add_match(shared_ptr<Channel> channel, const TriggerMatchType *type);
396 void add_match(shared_ptr<Channel> channel, const TriggerMatchType *type, float value);
398 vector<TriggerMatch *> matches;
399 TriggerStage(struct sr_trigger_stage *structure);
401 friend class Trigger;
404 /** A match condition in a trigger configuration */
405 class SR_API TriggerMatch : public StructureWrapper<TriggerStage, struct sr_trigger_match>
408 shared_ptr<Channel> get_channel();
409 const TriggerMatchType *get_type();
412 TriggerMatch(struct sr_trigger_match *structure, shared_ptr<Channel> channel);
414 shared_ptr<Channel> channel;
415 friend class TriggerStage;
418 /** Type of datafeed callback */
419 typedef function<void(shared_ptr<Device>, shared_ptr<Packet>)>
420 DatafeedCallbackFunction;
422 /* Data required for C callback function to call a C++ datafeed callback */
423 class SR_PRIV DatafeedCallbackData
426 void run(const struct sr_dev_inst *sdi,
427 const struct sr_datafeed_packet *pkt);
429 DatafeedCallbackFunction callback;
430 DatafeedCallbackData(Session *session,
431 DatafeedCallbackFunction callback);
433 friend class Session;
436 /** Type of source callback */
437 typedef function<bool(Glib::IOCondition)>
438 SourceCallbackFunction;
440 /* Data required for C callback function to call a C++ source callback */
441 class SR_PRIV SourceCallbackData
444 bool run(int revents);
446 SourceCallbackData(shared_ptr<EventSource> source);
447 shared_ptr<EventSource> source;
448 friend class Session;
451 /** An I/O event source */
452 class SR_API EventSource
455 /** Create an event source from a file descriptor. */
456 static shared_ptr<EventSource> create(int fd, Glib::IOCondition events,
457 int timeout, SourceCallbackFunction callback);
458 /** Create an event source from a Glib::PollFD */
459 static shared_ptr<EventSource> create(Glib::PollFD pollfd, int timeout,
460 SourceCallbackFunction callback);
461 /** Create an event source from a Glib::IOChannel */
462 static shared_ptr<EventSource> create(
463 Glib::RefPtr<Glib::IOChannel> channel, Glib::IOCondition events,
464 int timeout, SourceCallbackFunction callback);
466 EventSource(int timeout, SourceCallbackFunction callback);
475 Glib::RefPtr<Glib::IOChannel> channel;
476 Glib::IOCondition events;
478 SourceCallbackFunction callback;
479 /** Deleter needed to allow shared_ptr use with protected destructor. */
483 void operator()(EventSource *source) { delete source; }
485 friend class Deleter;
486 friend class Session;
487 friend class SourceCallbackData;
490 /** A sigrok session */
494 /** Add a device to this session. */
495 void add_device(shared_ptr<Device> device);
496 /** List devices attached to this session. */
497 vector<shared_ptr<Device> > get_devices();
498 /** Remove all devices from this session. */
499 void remove_devices();
500 /** Add a datafeed callback to this session. */
501 void add_datafeed_callback(DatafeedCallbackFunction callback);
502 /** Remove all datafeed callbacks from this session. */
503 void remove_datafeed_callbacks();
504 /** Add an event source. */
505 void add_source(shared_ptr<EventSource> source);
506 /** Remove an event source. */
507 void remove_source(shared_ptr<EventSource> source);
508 /** Start the session. */
510 /** Run the session event loop. */
512 /** Stop the session. */
514 /** Begin saving session to a file. */
515 void begin_save(string filename);
516 /** Append a packet to the session file being saved. */
517 void append(shared_ptr<Device> device, shared_ptr<Packet> packet);
518 /** Get current trigger setting. */
519 shared_ptr<Trigger> get_trigger();
520 /** Set trigger setting. */
521 void set_trigger(shared_ptr<Trigger> trigger);
523 Session(shared_ptr<Context> context);
524 Session(shared_ptr<Context> context, string filename);
526 struct sr_session *structure;
527 const shared_ptr<Context> context;
528 map<const struct sr_dev_inst *, shared_ptr<Device> > devices;
529 vector<DatafeedCallbackData *> datafeed_callbacks;
530 map<shared_ptr<EventSource>, SourceCallbackData *> source_callbacks;
532 bool save_initialized;
533 string save_filename;
534 uint64_t save_samplerate;
535 shared_ptr<Trigger> trigger;
536 /** Deleter needed to allow shared_ptr use with protected destructor. */
540 void operator()(Session *session) { delete session; }
542 friend class Deleter;
543 friend class Context;
544 friend class DatafeedCallbackData;
547 /** A packet on the session datafeed */
551 /** Type of this packet. */
552 const PacketType *get_type();
553 /** Payload of this packet. */
554 PacketPayload *get_payload();
556 Packet(const struct sr_datafeed_packet *structure);
558 const struct sr_datafeed_packet *structure;
559 PacketPayload *payload;
560 /** Deleter needed to allow shared_ptr use with protected destructor. */
564 void operator()(Packet *packet) { delete packet; }
566 friend class Deleter;
567 friend class Session;
569 friend class DatafeedCallbackData;
572 /** Abstract base class for datafeed packet payloads */
573 class SR_API PacketPayload
577 virtual ~PacketPayload() = 0;
578 virtual void *get_data() = 0;
579 virtual size_t get_data_size() = 0;
584 /** Payload of a datafeed packet with logic data */
585 class SR_API Logic : public PacketPayload
588 Logic(const struct sr_datafeed_logic *structure);
590 const struct sr_datafeed_logic *structure;
591 vector<uint8_t> data;
593 size_t get_data_size();
597 /** Payload of a datafeed packet with analog data */
598 class SR_API Analog : public PacketPayload
601 /** Number of samples in this packet. */
602 unsigned int get_num_samples();
603 /** Measured quantity of the samples in this packet. */
604 const Quantity *get_mq();
605 /** Unit of the samples in this packet. */
606 const Unit *get_unit();
607 /** Measurement flags associated with the samples in this packet. */
608 vector<const QuantityFlag *> get_mq_flags();
610 Analog(const struct sr_datafeed_analog *structure);
612 const struct sr_datafeed_analog *structure;
614 size_t get_data_size();
618 /** An input format supported by the library */
619 class SR_API InputFormat :
620 public StructureWrapper<Context, struct sr_input_format>
623 /** Name of this input format. */
625 /** Description of this input format. */
626 string get_description();
627 /** Check whether a given file matches this input format. */
628 bool format_match(string filename);
629 /** Open a file using this input format. */
630 shared_ptr<InputFileDevice> open_file(string filename,
631 map<string, string> options = {});
633 InputFormat(struct sr_input_format *structure);
635 friend class Context;
636 friend class InputFileDevice;
639 /** A virtual device associated with an input file */
640 class SR_API InputFileDevice : public Device
643 /** Load data from file. */
646 InputFileDevice(shared_ptr<InputFormat> format,
647 struct sr_input *input, string filename);
649 struct sr_input *input;
650 shared_ptr<InputFormat> format;
652 /** Deleter needed to allow shared_ptr use with protected destructor. */
656 void operator()(InputFileDevice *device) { delete device; }
658 friend class Deleter;
659 friend class InputFormat;
662 /** An output format supported by the library */
663 class SR_API OutputFormat :
664 public StructureWrapper<Context, struct sr_output_format>
667 /** Name of this output format. */
669 /** Description of this output format. */
670 string get_description();
671 /** Create an output using this format. */
672 shared_ptr<Output> create_output(shared_ptr<Device> device, map<string, string> options = {});
674 OutputFormat(struct sr_output_format *structure);
676 friend class Context;
680 /** An output instance (an output format applied to a device) */
684 /** Update output with data from the given packet. */
685 string receive(shared_ptr<Packet> packet);
687 Output(shared_ptr<OutputFormat> format, shared_ptr<Device> device);
688 Output(shared_ptr<OutputFormat> format,
689 shared_ptr<Device> device, map<string, string> options);
691 struct sr_output *structure;
692 const shared_ptr<OutputFormat> format;
693 const shared_ptr<Device> device;
694 const map<string, string> options;
695 /** Deleter needed to allow shared_ptr use with protected destructor. */
699 void operator()(Output *output) { delete output; }
701 friend class Deleter;
702 friend class OutputFormat;
705 /** Base class for objects which wrap an enumeration value from libsigrok */
706 template <typename T> class SR_API EnumValue
709 /** The enum constant associated with this value. */
710 T get_id() const { return id; }
711 /** The name associated with this value. */
712 string get_name() const { return name; }
714 EnumValue(T id, const char name[]) : id(id), name(name) {}
724 #endif // LIBSIGROK_HPP