CN107171915B - Communication protocol changing method and device - Google Patents

Communication protocol changing method and device Download PDF

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Publication number
CN107171915B
CN107171915B CN201710202436.2A CN201710202436A CN107171915B CN 107171915 B CN107171915 B CN 107171915B CN 201710202436 A CN201710202436 A CN 201710202436A CN 107171915 B CN107171915 B CN 107171915B
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target
message
operation type
bus
communication
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CN107171915A (en
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施敏捷
王中照
蔡乾
宋久福
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Suzhou Jingkong Energy Technology Co ltd
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Suzhou Jk Energy 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
    • H04L69/08—Protocols for interworking; Protocol conversion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/40006—Architecture of a communication node
    • 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
    • H04L69/22—Parsing or analysis of headers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40208—Bus networks characterized by the use of a particular bus standard
    • H04L2012/40215—Controller Area Network CAN

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Small-Scale Networks (AREA)
  • Power Engineering (AREA)
  • Selective Calling Equipment (AREA)

Abstract

The invention discloses a method and a device for changing a communication protocol, wherein one method is executed by a first controller connected to a target CAN bus, and the first controller is also used for continuously sending a communication message to the target CAN bus. The method comprises the following steps: acquiring a change instruction of a communication protocol of a target CAN bus network; the change instruction is used for changing the communication protocol of the target CAN bus network; acquiring an operation type identifier and a target message identifier in a change instruction; determining the operation type of the communication protocol according to the operation type identifier, and determining a communication message to be changed according to the target message identifier; and changing the communication message to be changed according to the operation type. According to the invention, when the communication protocol of the target CAN bus network needs to be changed, software of the controllers in the CAN bus network does not need to be upgraded one by one, and only the change instruction needs to be sent to the first controller.

Description

Communication protocol changing method and device
Technical Field
The invention relates to the technical field of battery management systems, in particular to a method and a device for changing a communication protocol.
Background
The communication protocol refers to rules and conventions that must be followed by two entities to complete communication or service, and mainly consists of three elements, namely syntax, semantics and timing rules (timing sequence). Syntax, i.e., how to communicate, including format, coding, and signal level (level) of data; semantics, i.e., communication content, including data content, meaning, and control information, etc.; timing rules are when to communicate, including the order of communication, rate matching and ordering, etc.
A communication protocol which is formulated in advance is often written in controller software in a communication network, so that a message sent from the controller a to the controller B in the system operation process can be successfully analyzed by the controller B, and the controller B can know what each domain in the message means. A BMS (Battery Management System) is a communication Network that performs real-time communication with a vehicle-mounted main Controller, a motor Controller, an energy control System, a vehicle-mounted display System, etc. through a CAN (Controller Area Network) bus interface, and the CAN bus Network related to the BMS in the electric vehicle CAN be classified into a complete vehicle CAN bus Network, a charging CAN bus Network, a discharging bus CAN Network, and other CAN bus networks having specific functions according to functions. The data frame in the CAN bus network consists of an SOF frame starting field, an arbitration field, a control field, a data field, a CRC check field, an ACK response field and a frame ending field.
However, in the actual operation process, part of the content in the communication protocol of the communication network may be changed according to the actual application needs. For example, in a battery management system, with the development and progress of battery technology, parameters such as a maximum charging current, a maximum discharging current, a maximum charging voltage, a minimum charging voltage, and the like, which are suitable for a charging CAN network and a discharging CAN network (that is, controllers in the charging CAN network and the discharging CAN network perform corresponding operations according to the parameters) need to be changed; alternatively, the operation performed by the controller in the CAN network requires a change … …, because the communication protocol is written in the controller software in the communication network, the software of each controller in the communication network usually needs to be upgraded to change the communication protocol of the communication network.
However, this method requires upgrading the software of the controller in the communication network one by one, which is cumbersome; in addition, in the case of many controllers in a communication network, errors are also prone to occur.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and an apparatus for changing a communication protocol, so as to solve the problems that when a communication protocol is changed in the existing manner, a process is complicated and errors are easily caused when software of a controller needs to be upgraded one by one.
According to a first aspect, an embodiment of the present invention provides a method for changing a communication protocol, where the method is executed by a first controller connected to a target CAN bus, and the first controller is further configured to continuously send a communication packet to the target CAN bus; the target CAN bus is also connected with a plurality of second controllers, and the second controllers determine the operation executed by the second controllers according to the received communication messages; the method comprises the following steps: acquiring a change instruction of a communication protocol of a target CAN bus network; the change instruction is used for changing the communication protocol of the target CAN bus network; the target CAN bus network comprises a plurality of controllers connected by the target CAN bus; acquiring an operation type identifier and a target message identifier in the change instruction; the target message identifier is used for determining a communication message to be changed; determining the operation type of a communication protocol according to the operation type identifier, and determining a communication message to be changed according to the target message identifier; and changing the communication message to be changed according to the operation type.
Optionally, the operation type includes any one or more of: the first operation type is used for adding a communication message into the target CAN bus network; the second operation type is used for modifying the existing communication message in the target CAN bus network; and the third operation type is used for deleting the existing communication message in the target CAN bus network.
Optionally, the step of changing the communication packet to be changed according to the operation type includes: when the operation type is the first operation type, continuously sending a new message to the target CAN bus; the message identifier of the new message corresponds to a target message identifier in the change instruction, and the data field of the new message comprises data content provided in the change instruction; or when the operation type is the second operation type or the third operation type, stopping sending an old message to the target CAN bus, and starting to continuously send a new message to the target CAN bus; the old message is a communication protocol message which is existed in the target CAN bus network and corresponds to a message identifier and a target message identifier in the change instruction; the message identifier of the new message is the same as the target message identifier in the change instruction, and the data field of the new message comprises the data content provided by the change instruction; or when the operation type is the third operation type, stopping sending the old message to the target CAN bus; and the old message is a communication protocol message which is existed in the target CAN bus network and corresponds to the message identifier and the target message identifier in the change instruction.
Optionally, the change instruction includes a message type identifier, where the message type includes any one or more of the following; a standard data frame, an extended data frame, a standard remote frame, an extended remote frame; before the step of starting to continuously send a new message to the target CAN bus network, the method further comprises the following steps: and when the operation type is the first operation type or the second operation type, organizing a new message to be sent according to the message type.
According to a second aspect, an embodiment of the present invention provides a method for changing a communication protocol, which is executed by an upper computer; the method comprises the following steps: acquiring an operation type identifier and a target message identifier of an operation to be executed on a communication protocol of a target CAN bus network; organizing a change instruction of a communication protocol of the target CAN bus network according to the operation type identifier and the target message identifier; sending the organized change instruction to a first controller in the target CAN bus network; the first controller is connected to a target CAN bus and used for sending a communication message to the target CAN bus; and the target CAN bus is also connected with a plurality of second controllers, and the second controllers determine the operation executed by the second controllers according to the received communication messages.
Optionally, the operation type includes any one or more of: the first operation type is used for adding a communication message into the target CAN bus network; the second operation type is used for modifying the existing communication message in the target CAN bus network; and the third operation type is used for deleting the existing communication message in the target CAN bus network.
Optionally, before the step of organizing the change instruction of the communication protocol of the target CAN bus network, the method further includes: obtaining a message type identifier of a communication message to be changed, wherein the message type comprises any one or more of the following: standard data frames, extended data frames, standard remote frames, extended remote frames.
Optionally, when the operation type is the first operation type and the packet type is the standard data frame or the extended data frame, before the step of organizing a change instruction of a communication protocol of the target CAN bus network, the method further includes: and acquiring the data in the communication message to be newly added.
Optionally, before the step of organizing the change instruction of the communication protocol of the target CAN bus network, the method further includes: acquiring a target CAN bus network identifier; the step of sending the organized change instruction to a first controller in the target CAN bus network comprises: determining a target CAN bus network according to the target CAN bus network identifier; and sending the organized change instruction to a first controller in the target CAN bus network.
According to a third aspect, an embodiment of the present invention provides a device for changing a communication protocol, configured to connect to a first controller on a target CAN bus, where the first controller is further configured to continuously send a communication packet to the target CAN bus; the target CAN bus is also connected with a plurality of second controllers, and the second controllers determine the operation executed by the second controllers according to the received communication messages; the device comprises: the first acquisition unit is used for acquiring a change instruction of a communication protocol of the target CAN bus network; the change instruction is used for changing the communication protocol of the target CAN bus network; the target CAN bus network comprises a plurality of controllers connected by the target CAN bus; a second obtaining unit, configured to obtain an operation type identifier and a target packet identifier in the change instruction; the target message identifier is used for determining a communication message to be changed; a determining unit, configured to determine an operation type of a communication protocol according to the operation type identifier, and determine a communication packet to be changed according to the target packet identifier; and the changing unit is used for changing the communication message to be changed according to the operation type.
Optionally, the operation type includes any one or more of: the first operation type is used for adding a communication message into the target CAN bus network; the second operation type is used for modifying the existing communication message in the target CAN bus network; and the third operation type is used for deleting the existing communication message in the target CAN bus network.
Optionally, the changing unit includes: the first change subunit is configured to, when the operation type is the first operation type, start to continuously send a new message to the target CAN bus; the message identifier of the new message corresponds to a target message identifier in the change instruction, and the data field of the new message comprises data content provided in the change instruction; or, the second changing subunit is configured to, when the operation type is the second operation type or the third operation type, stop sending an old message to the target CAN bus, and start to continuously send a new message to the target CAN bus; the old message is a communication protocol message which is existed in the target CAN bus network and corresponds to a message identifier and a target message identifier in the change instruction; the message identifier of the new message is the same as the target message identifier in the change instruction, and the data field of the new message comprises the data content provided by the change instruction; or, the third changing subunit is configured to, when the operation type is the third operation type, stop sending an old message to the target CAN bus; and the old message is a communication protocol message which is existed in the target CAN bus network and corresponds to the message identifier and the target message identifier in the change instruction.
Optionally, the change instruction includes a message type identifier, where the message type includes any one or more of the following; a standard data frame, an extended data frame, a standard remote frame, an extended remote frame; the changing unit further includes: and the organizing subunit is configured to organize a new packet to be sent according to the packet type before starting to continuously send the new packet to the target CAN bus network when the operation type is the first operation type or the second operation type.
According to a fourth aspect, an embodiment of the present invention provides a device for changing a communication protocol, which is executed by an upper computer; the device comprises: the third acquisition unit is used for acquiring an operation type identifier and a target message identifier of an operation to be executed on a communication protocol of a target CAN bus network; the organization unit is used for organizing a change instruction of a communication protocol of the target CAN bus network according to the operation type identifier and the target message identifier; the sending unit is used for sending the organized change instruction to a first controller in the target CAN bus network; the first controller is connected to a target CAN bus and used for sending a communication message to the target CAN bus; and the target CAN bus is also connected with a plurality of second controllers, and the second controllers determine the operation executed by the second controllers according to the received communication messages.
Optionally, the operation type includes any one or more of: the first operation type is used for adding a communication message into the target CAN bus network; the second operation type is used for modifying the existing communication message in the target CAN bus network; and the third operation type is used for deleting the existing communication message in the target CAN bus network.
Optionally, the apparatus further comprises: a fourth obtaining unit, configured to obtain a packet type identifier of a communication packet that needs to be changed, where the packet type includes any one or more of the following: standard data frames, extended data frames, standard remote frames, extended remote frames.
Optionally, the apparatus further comprises: and the fifth obtaining unit is used for obtaining the data in the communication message to be newly added before organizing a change instruction of the communication protocol of the target CAN bus network when the operation type is the first operation type and the message type is the standard data frame or the extended data frame.
Optionally, the apparatus further comprises: a sixth obtaining unit, configured to obtain a target CAN bus network identifier before the step of organizing a change instruction of a communication protocol of the target CAN bus network; the transmission unit includes: the first determining subunit is used for determining a target CAN bus network according to the target CAN bus network identifier; and the sending subunit is used for sending the organized change instruction to the first controller in the target CAN bus network.
The method and the device for changing the communication protocol provided by the embodiment of the invention are characterized in that a first controller is arranged on a target CAN bus, a communication message is continuously sent to the target CAN bus, when the communication message needs to be changed, a user operates an upper computer, the upper computer acquires an operation type identifier and a target message identifier of an operation to be executed on the communication protocol of a CAN bus network, organizes a change instruction on the communication protocol of the CAN bus network according to the operation type identifier and the target message identifier, and sends the organized change instruction to the first controller in the CAN bus network. The first controller obtains the change instruction, obtains an operation type identifier and a target message identifier in the change instruction, determines an operation type of a communication protocol according to the operation type identifier, determines a communication message to be changed according to the target message identifier, and then changes the communication message to be changed according to the operation type. By the method, when the communication protocol of the target CAN bus network needs to be changed, software of the controllers in the CAN bus network does not need to be upgraded one by one, only the change instruction needs to be sent to the first controller, and the process of changing the communication protocol is simple and is not easy to make mistakes.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
fig. 1 is a schematic diagram showing an implementation environment of a changing method of a communication protocol according to an embodiment of the present invention;
fig. 2 shows a flow chart of a method of changing a communication protocol according to an embodiment of the invention;
fig. 3 shows a flow chart of a method of changing a communication protocol according to another embodiment of the present invention;
FIG. 4 shows a functional block diagram of a means of communication protocol alteration according to an embodiment of the present invention;
FIG. 5 shows a functional block diagram of a means of communication protocol alteration according to another embodiment of the present invention;
FIG. 6 shows a functional block diagram of a means of communication protocol alteration according to yet another embodiment of the present invention;
fig. 7 shows a schematic block diagram of a changing means of a communication protocol according to a further embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic diagram illustrating an implementation environment of a communication protocol changing method according to an embodiment of the present invention, where the implementation environment may be a Battery Management System (BMS) of an electric vehicle. As shown in fig. 1, the battery management system includes a plurality of nodes, each having a controller, such as controller A, B, C, D, E, connected to a CAN bus via a CAN transceiver (transceiver not shown). When a controller connected to the CAN bus sends information to other controllers on the CAN bus, the controller transmits the information to be sent to a transceiver of the node, and the transceiver is in a preparation state; when the transceiver receives the distributed bus resource, the transceiver changes to a message sending state, and sends the information to be sent to the CAN bus. The other nodes on the CAN bus are in a receiving state at this time. For other controllers on the CAN bus, whether the information is sent to the controller or not is received, the received information is detected, and whether the information is sent to the controller or not is judged to determine whether the information is processed or not.
It should be added that the controller described in the present invention is a device having a software program, and not only is a device for controlling, but also can be a device for processing user data, that is, the method for changing a communication protocol provided in the embodiment of the present invention can also be used for a processor.
Example one
Fig. 2 shows a flow chart of a method of changing a communication protocol according to an embodiment of the present invention. The changing method of the communication protocol is executed by a first controller connected to the target CAN bus, the first controller is connected to the upper computer, and is further configured to continuously send a communication packet to the target CAN bus, for example, a controller a shown in fig. 1. Also connected to the target CAN bus is a plurality of second controllers, such as controller B, C, D, E shown in fig. 1.
The second controller determines the operation it performs based on the received communication message, e.g., communication message a1 is used to inform the controllers in the target CAN bus network to: if the maximum charging current is 1A, the second controller will execute the program command with the maximum charging current of 1A, i.e., process with 1A when the maximum charging current is encountered. If communication message a1 is modified to inform the controller in the target CAN bus network: if the maximum charging current is 2A, the second controller will execute the program command with the maximum charging current of 2A, i.e. process with 2A when the maximum charging current is encountered.
Alternatively, for another example, the controller in the target CAN bus network has written in advance a program send () function command, and the communication message b1 is used to inform the controller in the target CAN bus network to: the specific operation of the send () function instruction is X-Y-Z (wherein X, Y, Z represents an operation step, respectively), and the second controller will execute the X-Y-Z operations when executing the send () function instruction. If communication message b1 is modified to inform the controller in the target CAN bus network: the send () function instruction is specifically A-B-C (wherein A, B, C represents an action step), and the second controller, when executing the send () function instruction, performs the sequential A-B-C operations (wherein A, B, C represents an action step).
According to the two examples, the operation executed by the second controller can be changed by modifying the communication message according to the scheme.
As shown in fig. 2, the method for changing the communication protocol includes the following steps:
s110: and acquiring a change instruction of the communication protocol of the target CAN bus network. For example, the host computer such as a server or a terminal, or other devices may send a change instruction to the first controller, and the first controller receives the change instruction.
The change instruction is used to change the communication protocol of the target CAN bus network. The target CAN bus network described herein includes a plurality of controllers connected by the target CAN bus. For example, the target CAN bus network shown in FIG. 1 includes a first controller A, and a second controller B, C, D, E.
S120: and acquiring an operation type identifier and a target message identifier in the change instruction.
Namely, the change instruction includes an operation type identifier and a target message identifier, the operation type identifier is used for identifying the operation type of the communication protocol, the target message identifier is used for identifying the target message, and each message in the target CAN bus network CAN be uniquely determined through the identifier.
S130: and determining the operation type of the communication protocol according to the operation type identifier, and determining the communication message to be changed according to the target message identifier.
S140: and changing the communication message to be changed according to the operation type.
The first controller stores each operation type and the operation to be executed by the first controller under a certain operation type in advance, different operation types correspond to corresponding operations, and the communication message to be changed can be changed by executing the corresponding operations according to the operation types.
The method for changing the communication protocol comprises the steps that a first controller is arranged on a target CAN bus, communication messages are continuously sent to the target CAN bus, when the communication messages need to be changed, an upper computer sends changing instructions of the communication protocol of a target CAN bus network to the first controller, the first controller obtains the changing instructions, obtains operation type identifiers and target message identifiers in the changing instructions, determines the operation type of the communication protocol according to the operation type identifiers, determines the communication messages to be changed according to the target message identifiers, and then changes the communication messages to be changed according to the operation type. By the method, when the communication protocol of the target CAN bus network needs to be changed, software of the controllers in the CAN bus network does not need to be upgraded one by one, only the change instruction needs to be sent to the first controller, and the process of changing the communication protocol is simple and is not easy to make mistakes.
Generally, there are three types of operations for a communication protocol packet, which are mainly addition, modification, and deletion, in the embodiment of the present invention, three types of operations are correspondingly provided, and the operation type in step S120 may adopt any one or more of the following: a first operation type, a second operation type, and a third operation type.
And the first operation type is used for adding a communication message into the target CAN bus network.
For example, a communication message c1 is newly added to the target CAN bus network to inform the controller in the target CAN bus network to: the maximum discharge voltage is 4V, and the second controller processes the maximum discharge voltage by 4V when executing the program. For another example, a message d1 is added to the target CAN bus network to inform the controller in the target CAN bus network: a processing operation process is newly added. For another example, a message e1 is newly added to the target CAN bus network to inform the controller in the target CAN bus network: an operation step D is added after the step C in the send () function instruction, namely the specific operation of the modified send () function instruction is A-B-C-D.
In the step S140, when the operation type is the first operation type, the first controller starts to continuously send a new message to the target CAN bus; the message identifier of the new message corresponds to the target message identifier in the change instruction, and the data field of the new message includes the data content provided in the change instruction. That is, when the operation type is the first operation type, the change instruction provides data in the new packet in addition to the operation type identifier and the target packet identifier, and following the above example, the change instruction provides: the operation type is a first operation type, the target message identifier is c1, and the maximum discharge voltage is 4V; as another example, the change instruction gives: the operation type is a first operation type, the target message identifier is d1, and the processing operation process is processed; for another example, the change instruction gives: the operation type is the first operation type, the target message identifier is e1, and an operation step D is added after the step C in the send () function instruction.
It should be noted that the data herein may refer to a specific value or identifier, or may refer to the processing operation process or step D, that is, the data may also be an instruction code for executing a certain operation.
Since the first controller does not send the communication message with the target message identifier to the target CAN bus before step S140, and starts sending the communication message with the target message identifier to the target CAN bus after step S140, the communication message with the target message identifier is newly added to the target CAN bus network from the overall effect.
The second operation type is used for modifying the existing communication message in the target CAN bus network. Along with the use of the above example, the communication message a1 is modified, and the maximum charging current is modified from 1A to 2A; for another example, the communication message B1 is modified, and the specific operation in the send () function instruction is modified from X-Y-Z to A-B-C; for another example, the operation D added after step C in the send () function instruction in the communication message E1 is modified to be the operation E.
In the step S140, when the operation type is the second operation type, the first controller stops sending the old message to the target CAN bus, and starts to continuously send the new message to the target CAN bus; the old message is a communication protocol message which is existed in the target CAN bus network and corresponds to the message identifier and the target message identifier in the change instruction; the message identifier of the new message is the same as the target message identifier in the change instruction, and the data field of the new message comprises the data content provided by the change instruction. That is, when the operation type is the second operation type, the change instruction provides the modified target data of the new communication packet in addition to the operation type identifier and the target packet identifier, and following the above example, the change instruction provides: the operation type is a second operation type, the target message identifier is c1, and the maximum discharge voltage is 5V; as another example, the change instruction gives: the operation type is a second operation type, the target message identifier is d1, and the processing operation process 2; for another example, the change instruction gives: the operation type is the second operation type, the target message identifier is E1, and an operation step E is added after the step C in the send () function instruction.
It should be noted that the data herein may refer to a specific value or identifier, or refer to the above processing operation process2 or step E, that is, the data may also be an instruction code for executing a certain operation.
Since the data contents in the data fields of the communication packets having the same target packet identifier are different before and after step S140, the communication packet having the target packet identifier in the target CAN bus network is modified in terms of overall effect.
The third operation type is used for deleting the existing communication message in the target CAN bus network, and the target message identifier is used for determining the communication message to be changed. Continuing to use the above example, deleting the communication message a1, that is, not informing the controller in the target CAN bus network of the maximum charging current; for another example, delete the communication packet d1, that is, delete the processing operation process 2; for another example, the communication message e1 does not add any operation step to the step C in the send () function instruction.
In the step S140, when the operation type is the third operation type, the old message is stopped from being sent to the target CAN bus network; the old message is a communication protocol message which is existed in the target CAN bus network and corresponds to the message identifier and the target message identifier in the change instruction. Along the above example, the communication messages a1, d1, e1 are no longer sent.
Since the first controller transmits the communication packet with the target packet identifier to the target CAN bus before step S140, and does not transmit the communication packet after step S140, the communication packet with the target packet identifier in the target CAN bus network is deleted from the overall effect.
Or, when the operation type is the third operation type, as a parallel optional implementation manner of the foregoing implementation manner, in step S140, when the operation type is the third operation type, the old message is stopped from being sent to the target CAN bus, and the new message is started to be continuously sent to the target CAN bus; the old message is a communication protocol message which is existed in the target CAN bus network and corresponds to the message identifier and the target message identifier in the change instruction; the message identifier of the new message is the same as the target message identifier in the change instruction, and the data field of the new message comprises the data content provided by the change instruction. At this time, the data field of the new packet is a predetermined value, and the data field cannot be the predetermined value or is empty under normal conditions.
Since the communication packet data field having the destination packet identifier is a normal value before step S140, and the communication packet data field having the destination packet identifier is an abnormal value (including a null value) after step S140, the communication packet data field having the destination packet identifier in the destination CAN bus network is deleted from the overall effect.
Messages in the CAN network are divided into five types, namely data frames, remote frames, error frames, overload frames, frame intervals and the like according to functions. The data frame is a frame in which the sending node transmits data to the receiving node, and the remote frame is a frame in which the receiving node requests data from the sending node with the same ID. By sending remote frames, a node that needs data can request another node to send a corresponding data frame, referred to as a remote data request. Both data frames and remote frames may use either a standard frame format or an extended frame format. The data frame consists of a SOF frame starting field, an arbitration field, a control field, a data field, a CRC check field, an ACK response field and a frame ending field. The remote frame consists of a frame start field, an arbitration field, a control field, a CRC check field, an ACK response field and a frame end field. It can be seen that the remote frame has no data field. Each field of the data frame or remote frame of the standard frame format and the extended frame format has a fixed number of bits.
As an optional implementation manner of this embodiment, further, the change instruction includes a message type identifier, and the message type includes any one or more of the following; a standard data frame, an extended data frame, a standard remote frame, an extended remote frame; before the step of starting to continuously send the new message to the target CAN bus network, the method further comprises the following steps: and when the operation type is the first operation type or the second operation type, organizing a new message to be sent according to the message type.
Optionally, the change instruction may further include a message sending period, that is, a communication message is sent at intervals, and when the first controller sends a message to the target CAN bus network, the first controller sends the message according to the message sending period.
Example two
Fig. 3 shows a flowchart of a method of changing a communication protocol according to another embodiment of the present invention. The method for changing the communication protocol is executed by the upper computer. The host computer is configured to send a change instruction of the communication protocol of the target CAN bus network to the first controller in the implementation environment (i.e., in the first embodiment) shown in fig. 1. As shown in fig. 3, the method for changing the communication protocol includes the following steps:
s210: and acquiring an operation type identifier and a target message identifier of an operation to be executed on a communication protocol of the target CAN bus network.
When a user needs to execute operation on a communication protocol of a target CAN bus network, the user operates the upper computer, selects an operation type and inputs or selects a target message identifier. And the upper computer receives and acquires an operation type identifier and a target message identifier of the operation to be executed.
S220: and organizing a change instruction of the communication protocol of the target CAN bus network according to the operation type identifier and the target message identifier.
S230: and sending the organized change instruction to a first controller in the target CAN bus network. The first controller is connected to a target CAN bus and is configured to send a communication packet to the target CAN bus, for example, controller a shown in fig. 1. The second controllers, such as the controller B, C, D, E shown in fig. 1, determine the operations to be performed by the second controllers according to the received communication messages, and refer to the first embodiment.
According to the communication protocol changing method, the first controller is arranged on the target CAN bus, the communication message is continuously sent to the target CAN bus, when the communication message needs to be changed, a user operates the upper computer, the upper computer obtains the operation type identifier and the target message identifier of the operation to be executed on the communication protocol of the CAN bus network, the change instruction of the communication protocol of the CAN bus network is organized according to the operation type identifier and the target message identifier, and the organized change instruction is sent to the first controller in the CAN bus network. By the method, when the communication protocol of the target CAN bus network needs to be changed, software of the controllers in the target CAN bus network does not need to be upgraded one by one, and only the upper computer needs to be operated to send a change instruction to the first controller.
Generally, operations of a communication protocol message mainly include three types of addition, modification and deletion, and the embodiment of the present invention correspondingly provides three operation types, and any one or more of the following steps may be adopted in the above steps: a first operation type, a second operation type, and a third operation type. The first operation type is used for adding a communication message to a target CAN bus network; the second operation type is used for modifying the existing communication message in the target CAN bus network; the third operation type is used for deleting the existing communication message in the target CAN bus network. For details, refer to the second embodiment.
As an optional implementation manner of this embodiment, before step S220, the method further includes step S240: obtaining a message type identifier of a communication message needing to be changed, wherein the message type comprises any one or more of the following: standard data frames, extended data frames, standard remote frames, extended remote frames. The message type refers to the first embodiment.
When a user needs to execute operation on a communication protocol of a target CAN bus network, the user operates the upper computer and also selects the message type of a communication message to be changed, such as selecting a standard data frame. The upper computer obtains the message type identifier and is used for organizing the change message.
It should be noted that the upper computer may not need to execute step S240, and the user may only operate the communication packet of a certain packet type.
Further, when the operation type is the first operation type and the message type is the standard data frame or the extended data frame, the data in the communication message to be newly added is also acquired. Referring to the first embodiment, when the operation type is the first operation type, the first controller needs to send a new message to the target CAN bus network, and when the new message is a data frame (a standard data frame or an extended data frame), the data field of the new message needs to be filled with data. For this, when the input operation type of the user on the upper computer is the first operation type and the message type is the standard data frame or the extended data frame, the data is also input to fill the data field of the data frame. The upper computer acquires the data and is used for organizing the change message.
The upper computer CAN set that only a change instruction CAN be sent to the first controller of a certain specific CAN bus network, namely, only the communication protocol of one CAN bus network CAN be changed. Or, as an optional implementation manner of this embodiment, the upper computer may be communicatively connected to the first controllers in the multiple CAN bus networks, and step S220 further includes step S250: a target CAN bus network identifier is obtained. Accordingly, step S230 includes S231 and S232.
S231: and determining the target CAN bus network according to the target CAN bus network identifier.
S232: and sending the organized change instruction to a first controller in the target CAN bus network.
Through the above steps S250, S231, and S232, the upper computer may send a change instruction to the plurality of CAN bus networks to change the communication protocols of the plurality of CAN bus networks.
EXAMPLE III
Fig. 4 shows a schematic block diagram of a changing means of a communication protocol according to an embodiment of the invention. The communication protocol changing device is used for executing the communication protocol changing method described in the first embodiment, and is used for a first controller connected to a target CAN bus, and the first controller is further used for continuously sending a communication message to the target CAN bus. And the target CAN bus is also connected with a plurality of second controllers, and the second controllers determine the operation executed by the second controllers according to the received communication messages. As shown in fig. 4, the communication protocol changing apparatus includes a first acquiring unit 10, a second acquiring unit 20, a determining unit 30, and a changing unit 40.
The first acquiring unit 10 is configured to acquire a change instruction of a communication protocol of a target CAN bus network. The change instruction is used for changing the communication protocol of the target CAN bus network. The target CAN bus network includes a plurality of controllers connected by a target CAN bus.
The second obtaining unit 20 is configured to obtain the operation type identifier and the destination packet identifier in the change instruction. The destination message identifier is used to determine the communication message to be altered.
The determining unit 30 is configured to determine an operation type of the communication protocol according to the operation type identifier, and determine a communication packet to be changed according to the destination packet identifier.
And the changing unit 40 is used for changing the communication message to be changed according to the operation type.
The communication protocol changing device is characterized in that a first controller is arranged on a target CAN bus and continuously sends communication messages to the target CAN bus, when the communication messages need to be changed, an upper computer sends a changing instruction of the communication protocol of a target CAN bus network to the first controller, the first controller obtains the changing instruction and obtains an operation type identifier and a target message identifier in the changing instruction, the operation type of the communication protocol is determined according to the operation type identifier, the communication messages to be changed are determined according to the target message identifier, and then the communication messages to be changed are changed according to the operation type. By the method, when the communication protocol of the target CAN bus network needs to be changed, software of the controllers in the CAN bus network does not need to be upgraded one by one, only the change instruction needs to be sent to the first controller, and the process of changing the communication protocol is simple and is not easy to make mistakes.
Optionally, the type of operation includes any one or more of: and the first operation type is used for adding a communication message into the target CAN bus network. And the second operation type is used for modifying the existing communication message in the target CAN bus network. And the third operation type is used for deleting the existing communication message in the target CAN bus network.
As an alternative embodiment of this embodiment, as shown in fig. 5, the changing unit 40 includes a first changing subunit 41, a second changing subunit 42, and a third changing subunit 43.
And a first change subunit 41, configured to start to continuously send a new message to the target CAN bus when the operation type is the first operation type. The message identifier of the new message corresponds to the target message identifier in the change instruction, and the data field of the new message includes the data content provided in the change instruction. Alternatively, the first and second electrodes may be,
and a second changing subunit 42, configured to, when the operation type is the second operation type or the third operation type, stop sending the old message to the target CAN bus, and start to continuously send a new message to the target CAN bus. The old message is a communication protocol message which is existed in the target CAN bus network and corresponds to the message identifier and the target message identifier in the change instruction. The message identifier of the new message is the same as the target message identifier in the change instruction, and the data field of the new message comprises the data content provided by the change instruction. Alternatively, the first and second electrodes may be,
and a third changing subunit 43, configured to stop sending the old message to the target CAN bus when the operation type is the third operation type. The old message is a communication protocol message which is existed in the target CAN bus network and corresponds to the message identifier and the target message identifier in the change instruction.
Optionally, the change instruction includes a message type identifier, and the message type includes any one or more of the following. Standard data frames, extended data frames, standard remote frames, extended remote frames. As shown in fig. 5, the changing unit 40 further includes an organizing subunit 44, configured to organize a new message to be sent according to a message type before starting to continuously send the new message to the target CAN bus network when the operation type is the first operation type or the second operation type.
Example four
Fig. 6 is a schematic block diagram of a communication protocol modification apparatus according to another embodiment of the present invention, which is used for executing the communication protocol modification method according to the first embodiment, and is used for an upper computer. As shown in fig. 6, the communication protocol changing apparatus includes a third acquiring unit 50, an organizing unit 60, and a transmitting unit 70.
The third obtaining unit 50 is configured to obtain an operation type identifier and a target packet identifier of an operation to be performed on a communication protocol of the target CAN bus network.
And the organizing unit 60 is configured to organize a change instruction of the communication protocol of the target CAN bus network according to the operation type identifier and the target message identifier.
And a sending unit 70, configured to send the organized change instruction to the first controller in the target CAN bus network. The first controller is connected to the target CAN bus and used for sending the communication message to the target CAN bus. And the target CAN bus is also connected with a plurality of second controllers, and the second controllers determine the operation executed by the second controllers according to the received communication messages.
According to the communication protocol changing device, the first controller is arranged on the target CAN bus, the communication message is continuously sent to the target CAN bus, when the communication message needs to be changed, a user operates the upper computer, the upper computer obtains the operation type identifier and the target message identifier of the operation to be executed on the communication protocol of the CAN bus network, the change instruction of the communication protocol of the CAN bus network is organized according to the operation type identifier and the target message identifier, and the organized change instruction is sent to the first controller in the CAN bus network. By the method, when the communication protocol of the target CAN bus network needs to be changed, software of the controllers in the CAN bus network does not need to be upgraded one by one, and only the upper computer needs to be operated to send a change instruction to the first controller.
Optionally, the type of operation includes any one or more of: and the first operation type is used for adding a communication message into the target CAN bus network. And the second operation type is used for modifying the existing communication message in the target CAN bus network. And the third operation type is used for deleting the existing communication message in the target CAN bus network.
As an optional implementation manner of this embodiment, the apparatus for changing a communication protocol further includes a fourth obtaining unit 80, configured to obtain a message type identifier of a communication message that needs to be changed, where the message type includes any one or more of the following: standard data frames, extended data frames, standard remote frames, extended remote frames.
As an optional implementation manner of this embodiment, the apparatus for changing a communication protocol further includes a fifth obtaining unit 90, configured to obtain data in a communication message to be newly added before organizing a change instruction for the communication protocol of the target CAN bus network when the operation type is the first operation type and the message type is the standard data frame or the extended data frame.
As an optional implementation manner of this embodiment, the apparatus for changing a communication protocol further includes a sixth obtaining unit 100, configured to obtain the identifier of the target CAN bus network before the step of organizing the change instruction of the communication protocol for the target CAN bus network. Accordingly, the transmitting unit 70 comprises a first determining sub-unit 71 and a transmitting sub-unit 72.
A first determining subunit 71, configured to determine the target CAN bus network according to the target CAN bus network identifier.
And a sending subunit 72, configured to send the organized change instruction to the first controller in the target CAN bus network.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims (8)

1. A method for changing a communication protocol is characterized in that the method is executed by a first controller connected to a target CAN bus, and the first controller is also used for continuously sending a communication message to the target CAN bus; the target CAN bus is also connected with a plurality of second controllers, and the second controllers determine the operation executed by the second controllers according to the received communication messages; the method comprises the following steps:
acquiring a change instruction of a communication protocol of a target CAN bus network; the change instruction is used for changing the communication protocol of the target CAN bus network; the target CAN bus network comprises a plurality of controllers connected by the target CAN bus;
acquiring an operation type identifier and a target message identifier in the change instruction; the target message identifier is used for determining a communication message to be changed;
determining the operation type of a communication protocol according to the operation type identifier, and determining a communication message to be changed according to the target message identifier;
changing the communication message to be changed according to the operation type;
wherein the operation type includes any one or more of: the first operation type is used for adding a communication message into the target CAN bus network; the second operation type is used for modifying the existing communication message in the target CAN bus network; and the third operation type is used for deleting the existing communication message in the target CAN bus network.
2. The method according to claim 1, wherein the step of changing the communication packet to be changed according to the operation type includes:
when the operation type is the first operation type, continuously sending a new message to the target CAN bus; the message identifier of the new message corresponds to a target message identifier in the change instruction, and the data field of the new message comprises data content provided in the change instruction; alternatively, the first and second electrodes may be,
when the operation type is the second operation type or the third operation type, stopping sending an old message to the target CAN bus, and starting to continuously send a new message to the target CAN bus; the old message is a communication protocol message which is existed in the target CAN bus network and corresponds to a message identifier and a target message identifier in the change instruction; the message identifier of the new message is the same as the target message identifier in the change instruction, and the data field of the new message comprises the data content provided by the change instruction; alternatively, the first and second electrodes may be,
when the operation type is the third operation type, stopping sending an old message to the target CAN bus; and the old message is a communication protocol message which is existed in the target CAN bus network and corresponds to the message identifier and the target message identifier in the change instruction.
3. The method according to claim 2, wherein the change instruction includes a message type identifier, and the message type includes any one or more of the following; a standard data frame, an extended data frame, a standard remote frame, an extended remote frame; before the step of starting to continuously send a new message to the target CAN bus network, the method further comprises the following steps:
and when the operation type is the first operation type or the second operation type, organizing a new message to be sent according to the message type.
4. A method for changing a communication protocol is characterized in that the method is executed by an upper computer; the method comprises the following steps:
acquiring an operation type identifier and a target message identifier of an operation to be executed on a communication protocol of a target CAN bus network;
organizing a change instruction of a communication protocol of the target CAN bus network according to the operation type identifier and the target message identifier;
sending the organized change instruction to a first controller in the target CAN bus network; the first controller is connected to a target CAN bus and used for sending a communication message to the target CAN bus; the target CAN bus is also connected with a plurality of second controllers, and the second controllers determine the operation executed by the second controllers according to the received communication messages;
wherein the operation type includes any one or more of: the first operation type is used for adding a communication message into the target CAN bus network; the second operation type is used for modifying the existing communication message in the target CAN bus network; and the third operation type is used for deleting the existing communication message in the target CAN bus network.
5. The method of changing a communication protocol of claim 4, wherein the step of organizing change instructions for the communication protocol of the target CAN bus network is preceded by the step of: obtaining a message type identifier of a communication message to be changed, wherein the message type comprises any one or more of the following: standard data frames, extended data frames, standard remote frames, extended remote frames.
6. The method according to claim 5, wherein when the operation type is the first operation type and the packet type is the standard data frame or the extended data frame, the step of organizing a change instruction for the communication protocol of the target CAN bus network further comprises: and acquiring the data in the communication message to be newly added.
7. A communication protocol changing device is characterized by comprising a first controller connected to a target CAN bus, wherein the first controller is further used for continuously sending communication messages to the target CAN bus; the target CAN bus is also connected with a plurality of second controllers, and the second controllers determine the operation executed by the second controllers according to the received communication messages; the device comprises:
the first acquisition unit is used for acquiring a change instruction of a communication protocol of a target CAN bus network; the change instruction is used for changing the communication protocol of the target CAN bus network; the target CAN bus network comprises a plurality of controllers connected by the target CAN bus;
a second obtaining unit, configured to obtain an operation type identifier and a target packet identifier in the change instruction; the target message identifier is used for determining a communication message to be changed;
a determining unit, configured to determine an operation type of a communication protocol according to the operation type identifier, and determine a communication packet to be changed according to the target packet identifier;
a changing unit, configured to change the communication packet to be changed according to the operation type;
wherein the operation type includes any one or more of: the first operation type is used for adding a communication message into the target CAN bus network; the second operation type is used for modifying the existing communication message in the target CAN bus network; and the third operation type is used for deleting the existing communication message in the target CAN bus network.
8. A communication protocol changing device is characterized in that the device is executed by an upper computer; the device comprises:
the third acquisition unit is used for acquiring an operation type identifier and a target message identifier of an operation to be executed on a communication protocol of a target CAN bus network;
the organization unit is used for organizing a change instruction of a communication protocol of the target CAN bus network according to the operation type identifier and the target message identifier;
the sending unit is used for sending the organized change instruction to a first controller in the target CAN bus network; the first controller is connected to a target CAN bus and used for sending a communication message to the target CAN bus; the target CAN bus is also connected with a plurality of second controllers, and the second controllers determine the operation executed by the second controllers according to the received communication messages;
wherein the operation type includes any one or more of: the first operation type is used for adding a communication message into the target CAN bus network; the second operation type is used for modifying the existing communication message in the target CAN bus network; and the third operation type is used for deleting the existing communication message in the target CAN bus network.
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