CN110798464A - Universal client system based on UDS protocol communication - Google Patents

Universal client system based on UDS protocol communication Download PDF

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Publication number
CN110798464A
CN110798464A CN201911030990.2A CN201911030990A CN110798464A CN 110798464 A CN110798464 A CN 110798464A CN 201911030990 A CN201911030990 A CN 201911030990A CN 110798464 A CN110798464 A CN 110798464A
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Prior art keywords
module
uds
layer protocol
interface interaction
universal
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CN201911030990.2A
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Inventor
曹晨光
刘金花
侯斐
许峰
朱明岐
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DONGFENG ELECTRONIC TECHNOLOGY Co Ltd
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DONGFENG ELECTRONIC TECHNOLOGY Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/03—Protocol definition or specification 

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer And Data Communications (AREA)
  • Communication Control (AREA)

Abstract

The invention relates to a universal system of a client based on UDS protocol communication, which comprises an interface interaction module, a universal server module and a universal server module, wherein the interface interaction module is used for providing the setting and configuration of a user and delivering the processing, and displaying feedback and various error information; the application layer protocol module is used for packaging the information delivered by the interface interaction module into a UDS A _ PDU format; the network layer protocol module is used for arranging the UDS A _ PDU format into an N _ PDU format; the CAN equipment driving module is used for mapping the N _ PDU data to a CAN data frame for receiving and sending and writing the original data into a log. By adopting the universal client system based on the UDS protocol communication, various applications based on the UDS protocol CAN be developed quickly and in a cross-platform manner, more services and NRC support of the UDS are added, more CAN equipment is expanded simply, and the good framework structural formula is expanded and maintained quickly, so that the universal client system based on the UDS protocol has a wider application range based on the UDS protocol.

Description

Universal client system based on UDS protocol communication
Technical Field
The invention relates to the field of computers, in particular to the field of field bus communication, and specifically relates to a universal client system based on UDS protocol communication.
Background
With the widespread use of the fieldbus protocol, the CAN-based UDS (unified diagnostic services) protocol is utilized to perform parameter calibration, fault diagnosis, offline detection and program flashing more and more. Greatly facilitating the development and maintenance of vehicle-mounted products and related tools.
Tool software needs to be customized and developed according to customer requirements, the operating environment, CAN equipment and required services are different, but the standard protocol parts are the same, so that a common development software tool package is needed. Existing toolkits have C-based and Python-based, but these toolkits do not strictly distinguish between the application layer, the network layer, and the device driver layer, resulting in poor function expansion and device compatibility. On the other hand, the timing mechanism also depends on an external calling program, so that the tool kit dependency is large.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a universal client system based on the UDS protocol communication, which has the advantages of simple structure, quick maintenance and wide application.
In order to achieve the above object, the client generic system based on UDS protocol communication of the present invention is as follows:
the universal system for the client based on the UDS protocol communication is mainly characterized by comprising the following components:
the interface interaction module is used for providing the setting and configuration of a user and delivering the processing, and displaying feedback and various error information;
the application layer protocol module is connected with the interface interaction module and used for packaging the information delivered by the interface interaction module into a UDS A _ PDU format and collecting error information and delivering the error information to the interface interaction module for processing;
the network layer protocol module is connected with the application layer protocol module and is used for organizing the UDS A _ PDU format into an N _ PDU format and monitoring various errors of a network layer;
and the CAN equipment driving module is connected with the interface interaction module and the network layer protocol module and is used for mapping the N _ PDU data to a CAN data frame for receiving and sending and writing the original data into a log.
Preferably, the application layer protocol module includes a receiving buffer and a sending buffer, and is connected to the network layer protocol module.
Preferably, the CAN device driver module abstracts various CAN devices into a uniform interface through a factory mode.
Preferably, the application layer protocol module and the CAN device driver module both inherit a virtual base class, and a pure virtual function of the virtual base class provides a uniform interface for call-back and synchronization of communication between modules.
Preferably, the application layer protocol module comprises a standard interface for service access, and is connected with the interface interaction module.
Preferably, the system realizes communication between modules through a uniform interface provided by pure virtual functions of the virtual base class.
Preferably, the configuration of the interface interaction module includes CAN ID, UDS service, timing parameter, encryption algorithm and DID list.
By adopting the universal client system based on the UDS protocol communication, various applications based on the UDS protocol CAN be developed quickly and in a cross-platform manner, more services and NRC support of the UDS are added, more CAN equipment is expanded simply, and the good framework structural formula is expanded and maintained quickly, so that the universal client system based on the UDS protocol has a wider application range based on the UDS protocol.
Drawings
FIG. 1 is a schematic structural diagram of a universal system of a client based on UDS protocol communication according to the present invention.
FIG. 2 is a diagram of the application layer protocol module and the network layer protocol module of the universal system of the client based on the UDS protocol communication.
FIG. 3 is a diagram of the interface interaction module and the CAN device driver module of the universal client system based on the UDS protocol communication.
Detailed Description
In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.
The universal system for the client based on the UDS protocol communication comprises the following components:
the interface interaction module is used for providing the setting and configuration of a user and delivering the processing, and displaying feedback and various error information;
the application layer protocol module is connected with the interface interaction module and used for packaging the information delivered by the interface interaction module into a UDS A _ PDU format and collecting error information and delivering the error information to the interface interaction module for processing;
the network layer protocol module is connected with the application layer protocol module and is used for organizing the UDS A _ PDU format into an N _ PDU format and monitoring various errors of a network layer;
and the CAN equipment driving module is connected with the interface interaction module and the network layer protocol module and is used for mapping the N _ PDU data to a CAN data frame for receiving and sending and writing the original data into a log.
As a preferred embodiment of the present invention, the application layer protocol module includes a receiving buffer and a sending buffer, and is connected to the network layer protocol module.
As a preferred embodiment of the present invention, the CAN device driver module abstracts various CAN devices into a uniform interface through a factory model.
As a preferred embodiment of the present invention, the application layer protocol module and the CAN device driver module both inherit a virtual base class, and a uniform interface provided by a pure virtual function of the virtual base class is used for call-back and synchronization of communication between modules.
As a preferred embodiment of the present invention, the application layer protocol module includes a standard interface for service access, and is connected to the interface interaction module.
As a preferred embodiment of the present invention, the system realizes communication between modules through a uniform interface provided by pure virtual functions of a virtual base class.
As a preferred embodiment of the present invention, the configuration of the interface interaction module includes CAN ID, UDS service, timing parameter, encryption algorithm and DID list.
In a specific implementation mode, the invention relates to a universal client system based on UDS protocol communication.
The interface interaction module is used for delivering the setting and configuration (including CANID, UDS service, timing parameters, encryption algorithm, DID list and the like) of a user to the application layer protocol module for processing, and displaying the feedback of the UDS server and various error information;
the application layer protocol module is used for providing various UDS services, packaging information delivered by the interface interaction module into a UDS A _ PDU format, delivering the UDS A _ PDU format to the Network layer protocol module, collecting various errors of the UDS protocol and errors from a Network layer (Network) at the same time, and delivering the errors to the interface interaction module for processing;
the network layer protocol module is used for collating the UDS A _ PDU into N _ PDU or splicing the collected N _ PDU into the UDS A _ PDU to be transferred to the application layer protocol module and monitoring various errors of the network layer;
and the CAN equipment driving module maps the N _ PDU to a CAN data frame L _ PDU for receiving and transmitting, and simultaneously CAN write the original data into a log for analysis.
The universal client system based on the UDS protocol communication uses standard C + +11 and does not depend on any third-party development library. The communication and synchronization between the modules is realized by adopting a uniform interface provided by pure virtual functions of virtual base class objects, and the timing is realized by std: thread, so that the modules can be very simply called by specific application programs without depending on any specific IDE (such as Visual Studio, Qt and the like), any compiler (gcc, xCode and the like) or any operating system (windows, Linux and the like).
Using standard C + +11 implementation, the inter-module communication mechanism and timing mechanism used are independent of any specific IDE (e.g., Visual Studio, Qt, etc.), any compiler or any operating system, and can be conveniently ported on PCs and various handheld devices.
In the universal system of the client based on the UDS protocol communication, the interface interaction module provides configurable options for users to select: CAN ID, UDS service, timing parameters, encryption algorithm, DID list and the like, and an application layer protocol module and a CAN equipment driving module are called according to the configuration.
In the universal system of the client based on the UDS protocol communication, the application layer protocol module provides various UDS services, encapsulates information delivered by the interface interaction module into a UDS A _ PDU format, delivers the information to the Network layer protocol module, collects various errors of the UDS protocol and errors from the Network layer (Network) at the same time, and delivers the errors to the interface interaction module for processing.
In the universal client system based on the UDS protocol communication, the network layer protocol module converts A _ PDU into N _ PDU and delivers the N _ PDU to the CAN equipment driving module.
In the client-side general system based on the UDS protocol communication, the CAN device driving module abstracts various CAN devices into a uniform interface by using a factory mode, and determines which device is generated according to a specific factory class when the CAN device driving module is used. Therefore, the CAN card CAN be conveniently compatible with various CAN devices, such as CAN case of Vector, ValueCAN of Intrepidics, Leaf of Kavaser, CAN acquisition card of Zhouyang and the like.
The application layer protocol module and the network layer protocol module inherit a virtual base class, and the virtual base class is provided with a uniform interface by a pure virtual function and is used for call-back and synchronization of communication between the modules.
The CAN equipment driver module uses a factory mode, all CAN equipment drivers inherit a virtual base class, a standard interface is abstracted from the virtual base class, and a concrete factory class determines which equipment is generated. The design CAN be conveniently compatible with various CAN devices.
The application layer protocol module provides a series of standard interfaces for service access, and the standard interfaces are used by the interface interaction module.
The application layer protocol module and the network layer protocol module inherit a virtual base class, and the virtual base class is provided with a uniform interface by a pure virtual function and is used for call-back and synchronization of communication between the modules.
The CAN equipment driver module uses a factory mode, all CAN equipment drivers inherit a virtual base class, a standard interface is abstracted from the virtual base class, and a concrete factory class determines which equipment is generated. The design CAN be conveniently compatible with various CAN devices.
The application layer protocol module provides a series of standard interfaces for service access, and the standard interfaces are used by the interface interaction module.
In addition, the system has the following characteristics:
(1) the application layer protocol module provides a standard access interface for a series of UDS services for use by the interface interaction module. In addition, auxiliary interfaces such as NRC acquisition, addressing mode query and the like are provided for the interface interaction module to call;
(2) the application layer protocol module uses standard C + +11 to specially design DID type, and is compatible with integer type and array type with various lengths for the interface interaction module to use;
(3) the network layer protocol module realizes ISO15765-2 by using standard C + +11, converts A _ PDU into N _ PDU and delivers the N _ PDU to the CAN device driving module.
An embodiment of a parameter calibration application of the present invention based on the UDS protocol is shown below:
an interface interaction module, the user can configure: 3 CANIDs (physical addressing, functional addressing and Server feedback), baud rate, timing parameters, encryption algorithm and security level, DID list. The interface interaction module packages the DID into 0x22 service or 0x2E service, and calls ReadDIDByIdifier (0x22) service and WriteDIDByIdifier (0x2E) service of the application layer protocol module to read and write parameters in the UDS server.
And a member in the interface interaction module inherits the virtual base class udsObject so as to process the feedback of the application layer protocol module, execute the calibration step and call the getNRC function of the application layer protocol module to display error information.
An application layer protocol module, providing the following 5 services:
SessionControl (0x10) service;
EcuReset (0x11) service;
SecurityAccess (0x27) service;
ReadDIDByIdentifier (0x22) service;
WriteDIDByIdentifier (0x2E) service;
the application layer protocol module uses std of C + +11 standard that thread realizes the timing parameter of the application layer: p2Client, and P3 Client.
And the network layer protocol module provides a txAppPdu () function to arrange the UDS A _ PDU into N _ PDU, combines the collected N _ PDU into the UDS A _ PDU after receiving the feedback of the UDSserver, and then calls a callback method of the application layer protocol module class to transmit the data to the application layer protocol module. The network layer protocol module uses std of C + +11 standard, wherein the thread realizes the timing parameter N _ Cr of the network layer and the timing of sending stMin.
And the CAN equipment driving module defines a virtual base class canDevice, and all CAN equipment drivers inherit from the canDevice. The interface interaction module comprises 4 pure virtual functions called by the interface interaction module:
initializing the device function;
closing the plant function;
enabling logging;
setting a log file directory;
and 2 purely virtual functions for the network layer protocol module to call:
function of received messages
Sending message function
Specific CAN devices implement these interfaces, for example, an Intrepdics device calls an icsneopenneodevice () interface and an icsneosetcittrate () interface of its development kit in sequence to implement an initDev () interface; calling icsneGetMessages () to realize an rxMessage () interface; calling icsnetxmessages () implements the txMessage () interface.
In addition, when the interface interaction module opens the log writing function, the CAN device driver module calls a sprintf function of the c + +11 standard to write the original data into the log.
The universal system for the client based on the UDS protocol communication also comprises the following characteristics:
(1) the application layer protocol module provides a series of service access standard interfaces (sessionControl, ecuReset, readDid, writeDid, etc.) for the interface interaction module to use. In addition, auxiliary interfaces such as NRC acquisition and addressing mode acquisition are provided for the interface interaction module to call;
(2) the application layer protocol module uses standard C + +11 to specially design DID type, and is compatible with integer type and array type with various lengths for the interface interaction module to use;
(3) the network layer protocol module realizes ISO15765-2 by using standard C + +11, converts A _ PDU into N _ PDU and delivers the N _ PDU to the CAN device driving module.
The application layer protocol module of the invention is realized according to the following scheme:
the application layer protocol module maintains two buffer areas of receiving and sending; the addresses of these two buffers are passed into the network layer protocol module when it is initialized. The UDS service functions and other functions within the application layer protocol module directly access these two buffers.
The function interfaces in the application layer protocol module are different according to specific services, for example:
·ecuReset
·securityAccess
·readDataByIdentifier
·writeDataByIdentifier
·routineControl
·TestPresent
·IOControl
services can be divided into two types according to the presence or absence of subfunction, and two internal interfaces are defined to encapsulate the UDS service.
When the callback (retcode) function of the application layer protocol module completes the following work:
if the Request is indicated to be sent completely, starting P3Client or P2Client timing according to the issuppressPosRef;
if the first frame of the feedback is indicated, the P3Client or P2Client timing is stopped
If it is indicated that the feedback has been completely received, a format check of the feedback is initiated. And after receiving the feedback, transferring the called callback method to an interface interaction module for further processing.
The DID class of the application layer protocol module is realized according to the following scheme:
the DID class has a plurality of construction methods to construct integer or integer arrays with different data types and different lengths. There are two variables inside the DID class that store the parameter values of the DID or pointers to the parameter values:
if the data type of the DID is a single integer, the value is directly stored in a fixed-length array, and the pointer to the parameter value is pointed to the fixed-length array.
If the DID data type is an integer array, the application layer protocol module will use new operation to obtain a memory area from the heap during construction, copy the contents pointed by the value pointers in the structure function parameter list one by one in the newly applied memory area, and then point the pointers pointing to the parameter values to the memory area.
Therefore, the DID type gives consideration to the use efficiency of the dynamic stack memory and the heap memory. Reading a single integer or reading some element of the integer array through a function.
The network layer protocol module of the invention is realized according to the following scheme:
constructor
The address of the specific subclass of canDevice needs to be assigned to the pointer of the virtual base class canDevice, the class pointer where the callback function is located, and other parameters are transmitted into the constructor. Therefore, the network layer protocol module only concerns the interface of the calling equipment, and does not need to concern the specific CAN equipment, so that the compatibility of the CAN equipment is realized.
Sending N _ PDU
If the frame is a single frame, calling a txMessage () method of the Device to directly return a sending result to the callback; otherwise, after the first frame is sent, the application layer protocol module is informed to enter a waiting stage through a callback.
Receive L _ PDU
If the single frame feedback is received, calling a callback to directly inform an application layer protocol module of a feedback result; if the flow control frame is received, sending a subsequent frame; if the first frame fed back by the multiple frames is received, the flow control frame is sent; and if the last frame of the multi-frame subsequent frames is received, calling a callback to inform an application layer protocol module to feed back a result after the collection is finished.
By adopting the universal client system based on the UDS protocol communication, various applications based on the UDS protocol CAN be developed quickly and in a cross-platform manner, more services and NRC support of the UDS are added, more CAN equipment is expanded simply, and the good framework structural formula is expanded and maintained quickly, so that the universal client system based on the UDS protocol has a wider application range based on the UDS protocol.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims (7)

1. A client generic system for UDS protocol based communication, said system comprising:
the interface interaction module is used for providing the setting and configuration of a user and delivering the processing, and displaying feedback and various error information;
the application layer protocol module is connected with the interface interaction module and used for packaging the information delivered by the interface interaction module into a UDS A _ PDU format and collecting error information and delivering the error information to the interface interaction module for processing;
the network layer protocol module is connected with the application layer protocol module and is used for organizing the UDS A _ PDU format into an N _ PDU format and monitoring various errors of a network layer;
and the CAN equipment driving module is connected with the interface interaction module and the network layer protocol module and is used for mapping the N _ PDU data to a CAN data frame for receiving and sending and writing the original data into a log.
2. The universal client system according to claim 1, wherein said application layer protocol module comprises a receive buffer and a transmit buffer, and is coupled to said network layer protocol module.
3. The UDS protocol communication based client generic system according to claim 1, wherein the CAN device driver module abstracts the various CAN devices into a unified interface through factory mode.
4. The universal client system according to claim 1, wherein the application layer protocol module and the CAN device driver module each inherit a virtual base class, and the pure virtual function of the virtual base class provides a uniform interface for call back and synchronization of communication between modules.
5. The universal client system according to claim 1, wherein said application layer protocol module comprises a standard interface for service access, and is connected to said interface interaction module.
6. The universal system for client based on UDS protocol communication according to claim 1, wherein said system enables inter-module communication through a uniform interface provided by pure virtual functions of virtual base class.
7. The universal client system according to claim 1, wherein the configuration of the interface interaction module comprises CAN ID, UDS services, timing parameters, encryption algorithms and DID list.
CN201911030990.2A 2019-10-28 2019-10-28 Universal client system based on UDS protocol communication Pending CN110798464A (en)

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Application publication date: 20200214