CN113111016A - Single channel device communication middleware - Google Patents
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- 238000003780 insertion Methods 0.000 description 2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/10—Program control for peripheral devices
- G06F13/102—Program control for peripheral devices where the programme performs an interfacing function, e.g. device driver
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
- G06F13/4081—Live connection to bus, e.g. hot-plugging
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/4401—Bootstrapping
- G06F9/4411—Configuring for operating with peripheral devices; Loading of device drivers
- G06F9/4413—Plug-and-play [PnP]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/54—Interprogram communication
- G06F9/546—Message passing systems or structures, e.g. queues
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2209/00—Indexing scheme relating to G06F9/00
- G06F2209/54—Indexing scheme relating to G06F9/54
- G06F2209/547—Messaging middleware
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Abstract
The invention discloses a single-channel equipment communication middleware, which forms a communication channel between application and equipment drivers, manages equipment of the same type and supports a plurality of users to use; when a user service or application opens the virtual equipment of the communication middleware, setting a concerned message mask and used communication equipment; the communication middleware operates corresponding communication equipment according to parameters transmitted by user service or application and establishes a dedicated message receiving and transmitting queue of the service or application; when the communication equipment receives the data, checking whether the message is in accordance with the message mask concerned by the user, if so, sending the message to the user, and thus, sequentially sending the message to each user; when the user sends a message, if the local loop is opened, the sent message can also be received by other users who use the same device in the same system and are concerned about the message, and then the sent message is sent out by the device. The invention avoids the shortage of hardware resources, and ensures the real-time performance of message transmission while supporting a plurality of service accesses.
Description
Technical Field
The invention relates to the technical field of embedded communication, in particular to communication middleware of single-channel equipment.
Background
In recent years, with the continuous development of electronic technology, the integration of modern electronic equipment systems has entered a new era, the modular highly Integrated (IME) system integration era. The electronic system with complicated components of the reconfigurable universal modules is beneficial to improving the usability of the system, increasing the success rate of the system, and greatly reducing the volume/quality/power consumption and the life cycle cost of the system. The traditional single-channel communication equipment is applied to complex electronic systems, such as can and uart, the input and output of a single channel of the traditional single-channel communication equipment can not meet complex requirements more and more, can not support simultaneous input and output of a plurality of services, can only be solved by increasing the number of the equipment, and hardware cost and more unreliable factors are increased.
At present, the single channel communication device is used in the following way: character device: support input and output of a single service or application; a network device: such as can equipment, joined to the network equipment can be shared by multi-user services or applications;
both of these approaches have their own drawbacks and deficiencies: character device: only single service or application use is supported, and under the condition that task migration of a highly integrated electronic system and hardware resources of single-channel communication equipment are limited, simultaneous use of a plurality of services cannot be met; a network device: although multiple devices can be supported, the timeliness and real-time performance of messages are not guaranteed after passing through a network protocol stack, and for devices in the embedded field, the use of the network protocol stack is not supported due to the shortage of certain hardware resources.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is to provide a single channel device communication middleware, which is added to a single operating device to solve the communication problem of using a single channel communication device simultaneously by multiple services or applications.
In order to achieve the above object, the present invention provides a single-channel device communication middleware, which forms a communication channel between an application and a device driver, so as to manage the same type of devices and support the use of multiple users; when a user service or application opens the virtual equipment of the communication middleware, setting a concerned message mask and used communication equipment; the communication middleware operates corresponding communication equipment according to parameters transmitted by user service or application and establishes a dedicated message receiving and transmitting queue of the service or application; when the communication equipment receives the data, checking whether the message is in accordance with the message mask concerned by the user, if so, sending the message to the user, and sending the message to each user in turn in the manner; when the user sends a message, if the local loop is opened, the sent message can also be received by other users who use the same device in the same system and are concerned about the message, and then the sent message is sent out by the device.
Preferably, the communication middleware exists in the device driver in the form of a virtual device and is hot-pluggable.
Preferably, the communication middleware performs two-stage message filtering on the communication message.
Preferably, the communication middleware performs centralized management and use on the same type of communication equipment, and the application layer can reuse the drive communication interface to perform a series of operations.
Preferably, the number of the communication devices corresponding to the device driver is one, the number of the applications is multiple, and data channels between the multiple applications are isolated from each other.
Preferably, the communication middleware supports four operations of a user service or application: virtual device on, virtual device off, send message, and receive message.
Preferably, the operation of opening the virtual device specifically includes: when the virtual device of the user operation communication middleware is opened, checking whether the communication device exists in the system, if so, continuing the subsequent operation, and the communication middleware creates an exclusive message queue and a message mask for the user, joins the message queue set of the communication device, and merges the message mask and the global mask of the device; when the communication device is operated by a user for the first time, a transceiving task for the communication device is created to process transceiving matters of the communication device.
Preferably, the operation of closing the virtual device specifically includes: when the virtual device of the communication middleware operated by a user is closed, the communication middleware deletes the exclusive message queue and the message mask in the message queue set of the corresponding communication device, and if the deleted message queue is the last message queue in the message queue set, the communication middleware informs the receiving and sending task of the corresponding communication device to close the device and quit.
Preferably, the operation of sending the message specifically includes: when the sending task detects that a new message is sent by a user, receiving the message; if the local loop is opened, the new message is forwarded to the receiving task, then the message is sent to the communication equipment, sent out by the communication equipment, and then the new message is continuously waited for.
Preferably, the operation of receiving the message specifically includes:
when the receiving task detects that a new message is received, confirming a source of the received message, if the local loopback is opened and the message is forwarded, receiving, and if the communication equipment has the new message, receiving the equipment message;
obtaining the matching of the new message and the global mask of the equipment, if the matching is unsuccessful, continuing to wait for the new message, otherwise, continuing the next operation;
searching an effective message queue in a message queue set of the equipment, matching a message mask corresponding to the message queue by using the new message, forwarding the message queue to the corresponding message queue if the matching is successful, receiving the message by user service or application, searching a next effective message queue in the message queue set after the matching is unsuccessful or the transmission is completed, sequentially matching and transmitting until the message queue set is traversed, and continuously waiting for the arrival of the next new message.
The invention has the beneficial effects that:
1. the method supports a plurality of users to use the same communication equipment, and ensures that the users do not interfere with each other;
2. resource competition of equipment in a large system is reduced;
3. the hardware cost is reduced, and the uncertainty caused by hardware upgrading is reduced; the shortage of hardware resources is avoided, and the real-time performance of message transmission is ensured while supporting a plurality of service accesses;
4. the problem that the same equipment is used in the process of task migration in the IMA system is solved;
5. the same type of equipment can be managed in a centralized way, so that the complexity of user program codes is reduced;
6. the communication middleware supports hot plug, replacement, upgrade and addition of interface equipment, does not need to restart the system, and increases the reliability of the system.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a software architecture diagram of the present invention.
FIG. 2 is a flow chart of the user open operation software of the present invention.
FIG. 3 is a flow chart of the user shutdown software of the present invention.
FIG. 4 is a flow chart of the send task software in the communication middleware of the present invention.
FIG. 5 is a flow chart of the receive task software in the communication middleware of the present invention.
Detailed Description
As shown in fig. 1, the present invention provides a single-channel device communication middleware, where the communication middleware forms a communication channel between an application and a device driver, so as to manage the same type of device and support multiple users to use, and as shown in the figure, the device driver corresponds to one communication device, the application is multiple, and the data channels between multiple applications are isolated from each other; when a user service or application opens the virtual equipment of the communication middleware, setting a concerned message mask and used communication equipment; the communication middleware operates corresponding communication equipment according to parameters transmitted by user service or application and establishes a dedicated message receiving and transmitting queue of the service or application; when the communication equipment receives the data, checking whether the message is in accordance with the message mask concerned by the user, if so, sending the message to the user, and sending the message to each user in turn in the manner; when the user sends the message, if the local loop is opened, the sent message can also be received by other users who use the same device in the same system and are concerned about the message, and then the message is sent out by the communication device.
The communication middleware carries out two-stage message filtering on communication messages, the communication middleware carries out centralized management and use on the same type of communication equipment, and the application layer multiplexes a driving communication interface to carry out a series of operations.
Meanwhile, the communication middleware exists in the device driver in the form of a virtual device, and can be hot-plugged, and the embedded system driver hot-plugging support principle is as follows:
this function is implemented based on the hot plug function of the SylixOS because in existing other embedded systems, none of the kernel threads in the kernel are used to detect changes in the interface of the industrial bus, and the driver part code must run under the kernel thread.
The principle that the SylixOS system supports hot-plugging is as follows:
1. a thread specially detecting the bus state is arranged in the kernel state;
2. after detecting the change of the bus state, the bus equipment type can be read;
3. after reading the device type, calling a driver corresponding to the system in a kernel mode, and creating the current device on the system;
4. completing the device driving, wherein the kernel hot-plug thread can send a module insertion signal to the concerned application process;
5. after the application process receives the module insertion signal, the inserted module can be used, and hot plug use of the equipment is completed.
The principle that the SylixOS system supports hot-plugging is as follows:
1. when the application program of the driver is used, a plug-pull event of the driver is registered when the application program is powered on;
2. when the sub-module is unplugged, the kernel hot plug thread can sense the sub-module through the detection bus pin;
3. when the module is sensed to be pulled away, the kernel hot plug thread sends a module pulling event signal to the registered application thread;
4. and the application thread receives the module pulling signal and then closes the use of the sub-module, thereby completing the hot-plug isolation of the equipment.
As shown in fig. 2-5, the communication middleware supports four operations of a user service or application: virtual device on, virtual device off, send message, and receive message.
As shown in fig. 2, the flow chart of the software for opening operation by the user specifically includes: when the virtual device of the user operation communication middleware is opened, checking whether the communication device exists in the system, if so, continuing the subsequent operation, and the communication middleware creates an exclusive message queue and a message mask for the user, joins the message queue set of the communication device, and merges the message mask and the global mask of the device; when the communication device is operated by a user for the first time, a transceiving task for the communication device is created to process transceiving matters of the communication device.
As shown in fig. 3, the software flow chart for the user shutdown operation is specifically that: when the virtual device of the communication middleware operated by a user is closed, the communication middleware deletes the exclusive message queue and the message mask in the message queue set of the corresponding communication device, and if the deleted message queue is the last message queue in the message queue set, the communication middleware informs the receiving and sending task of the corresponding communication device to close the device and quit.
Fig. 4 shows a flow chart of task sending software in the communication middleware, and the operation of sending a message specifically includes: when the sending task detects that a new message is sent by a user, receiving the message; if the local loop is opened, the new message is forwarded to the receiving task, then the message is sent to the communication equipment, sent out by the equipment, and then the new message is continuously waited for.
The flow chart of the software for receiving tasks in the communication middleware is shown in FIG. 5: the operation of receiving the message specifically comprises:
when the receiving task detects that a new message is received, confirming a source of the received message, if the local loopback is opened and the message is forwarded, receiving, and if the communication equipment has the new message, receiving the equipment message;
obtaining the matching of the new message and the global mask of the equipment, if the matching is unsuccessful, continuing to wait for the new message, otherwise, continuing the next operation;
searching an effective message queue in a message queue set of the equipment, matching a message mask corresponding to the message queue by using the new message, forwarding the message queue to the corresponding message queue if the matching is successful, receiving the message by user service or application, searching a next effective message queue in the message queue set after the matching is unsuccessful or the transmission is completed, sequentially matching and transmitting until the message queue set is traversed, and continuously waiting for the arrival of the next new message.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. Single channel equipment communication middleware, its characterized in that: the communication middleware forms a communication channel between the application and the equipment driver, so as to manage the same type of equipment and support a plurality of users to use; when a user service or application opens a virtual device of a communication middleware, setting a concerned message mask and a used communication device thereof, operating the corresponding communication device by the communication middleware according to parameters transmitted by the user service or application, and establishing a dedicated message receiving and transmitting queue of the service or application; when the communication equipment receives the data, checking whether the message is in accordance with the message mask concerned by the user, if so, sending the message to the user, and sending the message to each user in turn in the manner; when the user sends a message, if the local loop is opened, the sent message can also be received by other users who use the same device in the same system and are concerned about the message, and then the sent message is sent out by the device.
2. The single channel device communication middleware of claim 1, wherein: the communication middleware exists in the device driver in the form of a virtual device and can be hot-plugged.
3. The single channel device communication middleware of claim 1, wherein: the communication middleware performs two-stage message filtering on the communication message.
4. The single channel device communication middleware of claim 1, wherein: the communication middleware is used for centralized management and use of the same type of communication equipment, and the application layer can reuse the drive communication interface to carry out a series of operations.
5. The single channel device communication middleware of claim 1, wherein: the device driver comprises one corresponding communication device, the application comprises a plurality of applications, and data channels among the applications are isolated from each other.
6. The single channel device communication middleware of claim 1, wherein: the communication middleware supports four operations of user service or application: virtual device on, virtual device off, send message, and receive message.
7. The single channel device communication middleware of claim 6, wherein the virtual device is turned on by: when the virtual device of the user operation communication middleware is opened, checking whether the communication device exists in the system, if so, continuing the subsequent operation, and the communication middleware creates an exclusive message queue and a message mask for the user, joins the message queue set of the communication device, and merges the message mask and the global mask of the communication device; when the communication device is operated by a user for the first time, a transceiving task for the communication device is created to process transceiving matters of the communication device.
8. The single channel device communication middleware of claim 6, wherein the virtual device shutdown is specifically: when the virtual device of the communication middleware operated by a user is closed, the communication middleware deletes the exclusive message queue and the message mask in the message queue set of the corresponding communication device, and if the deleted message queue is the last message queue in the message queue set, the communication middleware informs the receiving and sending task of the corresponding communication device to close the device and quit.
9. The single channel device communication middleware of claim 6, wherein the operation of sending messages is specifically: when the sending task detects that a new message is sent by a user, receiving the message; if the local loop is opened, the new message is forwarded to the receiving task, then the message is sent to the communication equipment, sent out by the communication equipment, and then the new message is continuously waited for.
10. The single channel device communication middleware of claim 6, wherein the operation of receiving messages is specifically:
when the receiving task detects that a new message is received, the source of the received message is confirmed, if the local loopback is opened and the message is forwarded, the message is received, and if the communication equipment has the new message, the message of the communication equipment is received;
obtaining the matching of the new message and the global mask of the equipment, if the matching is unsuccessful, continuing to wait for the new message, otherwise, continuing the next operation;
searching an effective message queue in a message queue set of the equipment, matching a message mask corresponding to the message queue by using the new message, forwarding the message queue to the corresponding message queue if the matching is successful, receiving the message by user service or application, searching a next effective message queue in the message queue set after the matching is unsuccessful or the transmission is completed, sequentially matching and transmitting until the message queue set is traversed, and continuously waiting for the arrival of the next new message.
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