CN113904882B - Communication control system and communication control method for multiple MCU units - Google Patents
Communication control system and communication control method for multiple MCU units Download PDFInfo
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- CN113904882B CN113904882B CN202111122472.0A CN202111122472A CN113904882B CN 113904882 B CN113904882 B CN 113904882B CN 202111122472 A CN202111122472 A CN 202111122472A CN 113904882 B CN113904882 B CN 113904882B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/66—Layer 2 routing, e.g. in Ethernet based MAN's
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
- H04L45/745—Address table lookup; Address filtering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/30—Peripheral units, e.g. input or output ports
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
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Abstract
The embodiment of the application discloses a communication control system and a communication control method of multiple MCU units, wherein the system comprises the following components: the system comprises two or more MCU units, an Ethernet control unit and an external hardware communication interface unit, wherein the Ethernet control unit is in communication connection with each MCU unit, and the external hardware communication interface unit is respectively in communication connection with the Ethernet control unit and external equipment, and the Ethernet control unit is used for realizing data forwarding between the MCU units and the external equipment; the MCU units are connected to the Ethernet control unit, so that the MCU units share one network port resource, the design complexity of a hardware interface is reduced, and the hardware cost is reduced.
Description
Technical Field
The application relates to the technical field of communication, in particular to a communication control system and a communication control method for multiple MCU units.
Background
Along with the wide application of redundancy architecture, unmanned aerial vehicle, vehicle-mounted system and the like are increasingly integrated with a plurality of MCU modules on a hardware control board, so that redundancy backup is realized, and system safety is improved.
As shown in fig. 1, a hardware control board commonly used in the market at present integrates an MCU unit 1 to an MCU unit N, where the network port of each MCU unit is led out separately, and corresponding devices and interfaces are configured to realize independent connection with external devices. As shown in fig. 1, the MCU unit 1 is connected to a corresponding ethernet converter 1, and then connected to an external device through the interface of the network port isolation transformer 1 and the RJ45 1 to complete connection communication, and the MCU unit N is connected to the corresponding ethernet converter N, and then connected to the external device through the interface of the network port isolation transformer N and the RJ 45N to complete connection communication, so that each MCU unit independently shares a network port resource. However, since each MCU unit needs to be configured with a corresponding network port device and interface, the complexity of the control board hardware and interface is increased, and the hardware cost is increased.
Disclosure of Invention
The embodiment of the invention discloses a communication control system and a communication control method for multiple MCU units, which are used for reducing the design complexity of a hardware interface and reducing the hardware cost.
The first aspect of the embodiment of the invention discloses a communication control system of multiple MCU units, which can comprise:
two or more MCU units;
the Ethernet control unit is in communication connection with each MCU unit;
The external hardware communication interface unit is respectively in communication connection with the Ethernet control unit and the external equipment;
the Ethernet control unit is used for realizing data forwarding between the MCU unit and the external equipment.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, each MCU unit is communicatively connected to the ethernet control unit through a corresponding first data interface.
In a first aspect of the embodiment of the present invention, the ethernet control unit is further configured to receive a first data frame sent by a first source host, forward the first data frame to a first target host, receive a second data frame sent by the first target host for the first data frame, forward the second data frame to the first source host, obtain a media access control (Media Access Control, MAC) address of the first source host from the first data frame, obtain a MAC address of the first target host from the second data frame, establish a mapping relationship between the MAC address of the first source host and a port of the first source host in an established MAC address table, and establish a mapping relationship between the MAC address of the first target host and a port of the first target host, where the first target host is the external device, and where the first source host is the external device, the first target host is the MCU.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, a manner in which the ethernet control unit is configured to implement data forwarding between the MCU unit and the external device is specifically:
and in the communication process after the Ethernet control unit finishes initialization, receiving a third data frame sent by a second source host, acquiring an MAC address of a second target host from the third data frame, searching a first port matched with the MAC address of the second target host according to the mapping relation between the MAC address and the port in the MAC address table, and forwarding the third data frame to the second target host through the first port, wherein when the second source host is the MCU unit, the second target host is the external equipment, and when the second source host is the external equipment, the second target host is the MCU unit.
In an optional implementation manner, in the first aspect of the embodiment of the present invention, after the ethernet control unit is further configured to forward, through the first port, the third data frame to the second target host, when a fourth data frame sent by the second target host for the third data frame is received, an MAC address of the second source host is obtained from the fourth data frame, and according to a mapping relationship between the MAC address and a port in the MAC address table, a second port matched with the MAC address of the second source host is searched, and the fourth data frame is forwarded, through the second port, to the second source host.
In an optional implementation manner, in the first aspect of the embodiment of the present invention, the ethernet control unit is further configured to buffer, after the receiving, a third data frame sent by the second source host, the third data frame in a local data storage unit, and when it is detected that another data frame to be forwarded is already forwarded, perform the step of obtaining, from the third data frame, a MAC address of the second target host, where the other data frame to be forwarded is a data frame that is received by the ethernet control unit before a time of receiving the third data frame and is buffered in the data storage unit.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, a manner in which the ethernet control unit is configured to implement data forwarding between the MCU unit and the external device is specifically:
and in the communication process after the Ethernet control unit finishes initialization, receiving an upgrade file packet sent by a third source host, sequentially obtaining a fifth data frame from the upgrade file packet, obtaining an MAC address of a third target host from the fifth data frame, searching a third port matched with the MAC address of the third target host according to the mapping relation between the MAC address and the port in the MAC address table, and sending the fifth data frame to the corresponding third target host through the third port, wherein the third source host is the external equipment, the third target host is the MCU unit, the upgrade file packet comprises at least one fifth data frame, one fifth data frame indicates one third target host, and any two third target hosts indicated by the fifth data frames are different.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, when the second source host is the MCU unit, the second target host is another MCU unit except the second source host;
the Ethernet control unit is also used for realizing data forwarding between the MCU units.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, the external hardware communication interface unit includes a network port isolation transformer and a network interface;
the network port isolation transformer is connected with the Ethernet control unit and the network interface;
the network interface is also connected with the external device.
The second aspect of the embodiment of the invention discloses a communication control method of multiple MCU units, which is applied to a communication control system of the multiple MCU units, wherein the communication control system of the multiple MCU units comprises two or more MCU units, an Ethernet control unit and an external hardware communication interface unit, the Ethernet control unit is in communication connection with each MCU unit, and the external hardware communication interface unit is in communication connection with the Ethernet control unit and an external device respectively; the method comprises the following steps:
The Ethernet control unit receives a data frame sent by a source host, wherein the data frame indicates a target host;
the Ethernet control unit forwards the data frame to the target host;
when the source host is the MCU unit, the target host is the external device, and when the source host is the external device, the target host is the MCU unit.
A third aspect of an embodiment of the present invention discloses a vehicle, which may include:
a memory storing executable program code;
a processor coupled to the memory;
the processor invokes the executable program code stored in the memory to execute the communication control method of multiple MCU units disclosed in the second aspect of the embodiment of the present invention.
A fourth aspect of an embodiment of the present invention discloses a flying apparatus, which may include:
a memory storing executable program code;
a processor coupled to the memory;
the processor invokes the executable program code stored in the memory to execute the communication control method of multiple MCU units disclosed in the second aspect of the embodiment of the present invention.
A fifth aspect of the embodiments of the present invention discloses a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of any of the methods of the second aspect of the embodiments of the present invention.
A sixth aspect of the embodiments of the invention discloses a computer program product which, when run on a computer, causes the computer to perform part or all of the steps of any of the methods of the second aspect.
A seventh aspect of the embodiments of the present invention discloses an application publishing platform for publishing a computer program product, wherein the computer program product, when run on a computer, causes the computer to perform part or all of the steps of any one of the methods of the second aspect.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the communication control system of the multiple MCU units provided by the embodiment of the invention comprises an Ethernet control unit, an external hardware communication interface unit and two or more MCU units, wherein each MCU unit is in communication connection with the Ethernet control unit, the Ethernet control unit is also in communication connection with the external hardware communication interface unit, the external hardware communication interface unit is in communication connection with external equipment, and the Ethernet control unit can realize data forwarding between the MCU unit and the external equipment; therefore, by implementing the embodiment of the invention, the plurality of MCU units are connected to one Ethernet control unit, namely the plurality of MCU units are connected to one network port, so that the design complexity of a hardware interface can be reduced on the premise of ensuring that each MCU unit keeps external communication as the network port, and the hardware cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a communication control system of multiple MCU units as disclosed in the prior art;
fig. 2 is a schematic structural diagram of a communication control system with multiple MCU units according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a communication control system with multiple MCU units according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a communication control system with multiple MCU units according to a third embodiment of the present invention;
FIG. 5 is a flow chart of a communication control method for multiple MCU units according to an embodiment of the present invention;
fig. 6 is a flow chart of a communication control method of multiple MCU units according to the second embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the terms "first," "second," "third," and "fourth," etc. in the description and claims of the present invention are used for distinguishing between different objects and not for describing a particular sequential order. The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention discloses a communication control system and a communication control method for multiple MCU units, which are used for reducing the number of network interfaces, reducing the design complexity of hardware interfaces and reducing the hardware cost.
Referring to fig. 2 to fig. 4, fig. 2 is a schematic structural diagram of a communication control system with multiple MCU units disclosed in the first embodiment of the present invention, fig. 3 is a schematic structural diagram of a communication control system with multiple MCU units disclosed in the second embodiment of the present invention, and fig. 4 is a schematic structural diagram of a communication control system with multiple MCU units disclosed in the third embodiment of the present invention; referring to fig. 2 to 4, the communication control system of the multi-MCU unit may include:
Two or more MCU units 11;
an ethernet control unit 12, the ethernet control unit 12 being communicatively connected to each MCU unit 11;
an external hardware communication interface unit 13, wherein the external hardware communication interface unit 13 is respectively connected with the Ethernet control unit 12 and external equipment in a communication manner;
the ethernet control unit 12 is configured to implement data forwarding between the MCU unit 11 and an external device.
In the embodiment of the present invention, the hardware control board integrates a plurality of MCU units 11, where the MCU units 11 mainly function to process and analyze data frames received from the ethernet control unit 12, or process and analyze environmental and status data received from other interfaces on the hardware control board, and after completing the processing, may also send corresponding control instructions to external devices to return data frames (possibly including control instructions) or internal controlled devices, etc. In addition, a plurality of MCU units 11 are designed in the system, mainly for redundancy backup, so as to improve the system security.
The ethernet control unit 12 disclosed in the embodiment of the present invention may also be called an ethernet switch unit, which is equivalent to functioning as a switch in the system, and implements data forwarding between the MCU units 11 and external devices or data forwarding between the MCU units. Optionally, when the external device sends data to the MCU 11, the data content may include environmental and status data collected by the external device, and the system is applied to a vehicle, where the external device is a camera, and the camera collects environmental image information in real time and sends the environmental image information to the MCU of the vehicle, so that the vehicle can analyze the environmental image information through the MCU 11 to provide a reliable driving route for the vehicle, and assist driving of the vehicle. Alternatively, when the MCU 11 sends data to an external device, the data content may include a control instruction, and the system is applied to a vehicle, where the external device is a vehicle lamp, and the MCU 11 sends the control instruction to the vehicle lamp to control the vehicle lamp to execute a corresponding light effect according to the control instruction. Of course, the system can also be applied to a vehicle-mounted unmanned aerial vehicle, the external equipment is a camera, the MCU unit 11 in the vehicle-mounted unmanned aerial vehicle sends a control instruction, the camera shoots environment image information according to the control instruction, then the environment image information is fed back to the MCU unit 11, and the MCU unit 11 sends a next control instruction to the camera, so that interaction between the MCU unit and the camera is realized.
It can be seen that, by implementing the above embodiment, by connecting the plurality of MCU units 11 on the hardware control board to one ethernet control unit 12 and connecting the external device via one external hardware communication interface unit 13, that is, connecting the plurality of MCU units 11 to one network port, the design complexity of the hardware interface can be reduced on the premise of ensuring that each MCU unit 11 keeps the external communication as the network port, thereby reducing the hardware cost.
In some embodiments, in conjunction with fig. 3, each MCU unit 11 is connected to the ethernet control unit 12 through a corresponding first data interface, so that an independent data channel is formed between each MCU unit 11 and the ethernet control unit 12. Optionally, the first data interface may be one of a media independent interface or a media independent interface (Media Independent Interface, MII), a reduced MII interface (Reduced Media Independant Interface, RMII), a gigabit MII interface (Gigabit Media Independant Interface, GMII), and a gigabit media independent interface (Reduced Gigabit Media Independent Interface, RGMII), which are digital interfaces, wherein MII and RMII are digital interfaces of 100Mbps, GMII and RGMII are digital interfaces of 1000Mbps, and are communicatively connected between the MCU unit 11 and the ethernet control unit 12 through the data interfaces, so that data transmission efficiency can be improved, and large data transmission can be achieved.
The MCU 11 sends ethernet data to the ethernet control unit 12 through any one of the above digital interfaces, and the ethernet control unit 12 forwards the data to the corresponding external device through the external hardware communication interface unit 13; similarly, the ethernet control unit 12 may also receive the data of the external device through the external hardware communication interface unit 13, and forward the received data to the corresponding MCU unit 11 through the data interface, and by using the above digital interface to perform docking between the ethernet control unit 12 and the MCU unit 11, large data transmission may be achieved, and transmission efficiency may also be improved.
Alternatively, the ethernet control unit 12 may be further configured to implement data forwarding between the MCU units 11, that is, the MCU units 11 may implement data transmission or data sharing via the ethernet control unit 12, for example, the MCU unit 1 and the MCU unit N in fig. 2 need to share the data 1, and the MCU unit 1 sends the data 1 to be shared to the ethernet control unit 12 and then forwards the data 1 to the MCU unit N via the ethernet control unit 12, so as to utilize a data interface between the ethernet control unit 12 and the MCU unit 11, thereby improving data transmission efficiency between the MCU units 11, so as to implement large data transmission or data sharing between the MCU units.
Of course, the MCU units 11 may also be connected through other communication interfaces, such as a universal asynchronous receiver Transmitter (Universal Asynchronous Receiver/Transmitter, UART) interface, a serial peripheral interface (Serial Peripheral Interface, SPI), etc., where the amount of data transmitted or shared between the MCU units is small, the data may be selectively transmitted through such interfaces to release the data interface between the MCU unit 11 and the ethernet control unit 12, thereby improving the overall working efficiency.
Further, referring to fig. 2 to fig. 4, the ethernet control unit 12 is further configured to receive a first data frame sent by the first source host, forward the first data frame to the first target host, receive a second data frame sent by the first target host for the first data frame, forward the second data frame to the first source host, obtain the MAC address of the first source host from the first data frame and obtain the MAC address of the first target host from the second data frame, establish a mapping relationship between the MAC address of the first source host and a port of the first source host in the established MAC address table, and establish a mapping relationship between the MAC address of the first target host and a port of the first target host.
When the ethernet control unit 12 is initialized, the ethernet control unit 12 creates a MAC address table locally, and stores a mapping relationship between a MAC address and a port through the MAC address table. Specifically, the first data frame is sent by the source host, the ethernet control unit 12 forwards the first data frame to the target host, the target host then returns the second data frame for the first data frame, the ethernet control unit 12 forwards the second data frame to the source host, the ethernet control unit 12 obtains the MAC address of the source host from the first data frame and the MAC address of the target host from the second data frame in the process, further obtains the port of the source host and the port of the target host, saves the mapping relation between the MAC address of the source host and the corresponding port in the MAC address table, and saves the mapping relation between the MAC address of the target host and the MAC address of the corresponding port, and performs the above steps for a plurality of times to complete the learning of the MAC addresses of all the MCU units 11 on the hardware control board and the MAC addresses of the external devices, thereby obtaining the learned MAC address table, so that the ethernet control unit 12 can quickly locate the port of the host based on the MAC address table, and realize the quick data transmission.
Alternatively, in the above embodiment, when the first source host is the MCU unit 11, the first target host may be an external device, or other MCU units 11 except the first source host, and when the first source host is an external device, the first target host is an MCU unit.
In some embodiments, after the ethernet control unit 12 completes initialization, in a normal communication process, a third data frame sent by the second source host is received, the MAC address of the second target host is obtained from the third data frame, according to the mapping relationship between the MAC address and the port in the MAC address table, the first port matched with the MAC address of the second target host is searched, the third data frame is forwarded to the second target host through the first port, when the second source host is an MCU unit, the second target host is an external device, and when the second source host is an external device, the second target host is an MCU unit.
In the above embodiment, after the initialization is completed, the ethernet control unit 12 enters the normal communication flow, after receiving the third data frame, the ethernet control unit 12 includes the MAC address of the second source host and the MAC address of the second target host, firstly reads the MAC address of the second target host from the third data frame, finds the first port of the second target host in the MAC address table according to the mapping relationship between the MAC address and the port, forwards the third data frame to the second target host through the first port, so as to realize the MCU unit and the external device based on the MAC address table established by the ethernet control unit 12, connect the MCU units to one network port, and communicate with the external device through one network port, thereby simplifying the design complexity of the hardware interface.
Specifically, when the second source host is an external device, the second target host is the MCU unit 11, the ethernet control unit 12 receives the third data frame from the external device via the external hardware communication interface unit 13, then obtains the MAC address of the second target host from the third data frame, searches the first port of the second target host via the mapping relationship between the MAC address and the port in the established MAC address table, and then forwards the third data frame from the first port to the corresponding MCU unit 11 via the first digital interface. On the contrary, when the second source host is the MCU unit 11, the second target host is an external device, the MCU unit 11 sends the third data frame to the ethernet control unit 12 through the first digital interface after passing through the corresponding port, the ethernet control unit 12 obtains the MAC address of the second target host from the third data frame, and looks up the table to obtain the first port of the second target host, and the ethernet control unit 12 sends the third data frame to the second target host through the external hardware communication interface unit 13.
Further, when the second source host is the MCU unit 11, the second target host may be an external device, or other MCU units 11 except the second source host, and when the second target host is other MCU units 11 except the second source host, the ethernet control unit 12 searches the first port corresponding to the MAC address of the second target host after receiving the third data frame from the second source host, and forwards the third data frame to the corresponding MCU unit 11 through the first digital interface via the first port. With this embodiment, the digital interface between the MCU units 11 and the ethernet control unit 12 may be utilized to increase the transmission rate between the MCU units 11, thereby realizing large data transmission or sharing between the MCU units.
Further, the ethernet control unit 12 is further configured to, after forwarding the third data frame to the second target host through the first port, obtain, when receiving a fourth data frame sent by the second target host for the third data frame, a MAC address of the second source host from the fourth data frame, find, according to a mapping relationship between the MAC address and the port in the MAC address table, a second port matching the MAC address of the second source host, and forward the fourth data frame to the second source host through the second port.
In the above embodiment, after the second source host sends the third data frame to the second target host, if the second target host needs to feed back the fourth data frame for the third data frame, the ethernet control unit 12 sends the fourth data frame to the second source host again, so as to implement the back-and-forth communication interaction between the second source host and the second target host.
In an alternative embodiment, the ethernet control unit 12, after receiving the third data frame sent by the second source host, buffers the third data frame in the local data storage unit, and when detecting that another data frame to be forwarded, which is received by the ethernet control unit before the receiving time of the third data frame and buffered in the data storage unit, has been forwarded, performs the step of obtaining the MAC address of the second target host from the third data frame.
In the above embodiment, the ethernet control unit 12 corresponds to a function of a switch, where all the data of the MCU unit 11 need to be forwarded through the ethernet control unit 12, in order to ensure the order of data transmission and reception and prevent data loss, the ethernet control unit 12 locally sets a data storage unit for caching the received data frame to be forwarded, so, for the third data frame received from the second source host, the ethernet control unit 12 first caches the third data frame in the data storage unit, further determines whether the other data frames to be forwarded received before complete forwarding, if there are other data frames to be forwarded, forwards the third data frame after forwarding the other data frames to be forwarded according to the time sequence of the received data frame, and if it is determined that there are no other data frames to be forwarded, forwards the third data frame directly.
Optionally, the other data frames to be forwarded are data frames received by the ethernet control unit 12 before the receiving time of the third data frame and buffered in the data storage unit, where the data frames are sequentially received according to the time sequence, and forwarding the data frames according to the receiving sequence.
Further alternatively, for the data frame that has completed forwarding, it may be deleted from the data storage unit, or for the data frame that has completed forwarding, the forwarded flag may be first performed in the data storage unit, and the time is simultaneously counted, and after a preset period is satisfied, it is deleted from the data storage unit.
Further, the ethernet control unit 12 may locally establish a message queue, put successively received data frames into the message queue according to a first-in first-out time sequence, and then sequentially read the data frames to be forwarded from the message queue for forwarding. After the ethernet control unit 12 receives the third data frame and puts it into the message queue, it detects whether there are other data frames to be forwarded in front of the message queue, if so, it forwards the data frames in front of the message queue in sequence, and then reads the third data frame for forwarding, so as to improve the order and accuracy of data forwarding, and more effectively prevent data loss.
Alternatively, in the normal communication process, if the ethernet control unit 12 receives a data frame of a new external device, it is necessary to learn the MAC address of the new external device, and complete updating of the MAC address table. Of course, the ethernet control unit 12 may also perform maintenance of the MAC address table periodically, and for the MAC address of the external device that has not performed communication beyond the preset duration, the MAC address may be deleted from the MAC address table, so as to update the MAC address table in time, reduce the cache occupied by the MAC address table, and meanwhile, maintain the MAC address in the MAC address table within a certain number, which is also helpful for improving the searching efficiency.
In some alternative embodiments, the ethernet control unit 12 receives an upgrade file packet sent by a third source host in the communication process after the initialization is completed, sequentially obtains a fifth data frame from the upgrade file packet, obtains an MAC address of a third target host from the fifth data frame, searches a third port matched with the MAC address of the third target host according to a mapping relationship between the MAC address and the port in the MAC address table, sends the fifth data frame to the corresponding third target host through the third port, where the third source host is an external device, the third target host is an MCU, the upgrade file packet includes at least one fifth data frame, one fifth data frame indicates one third target host, and the third target hosts indicated by any two fifth data frames are different.
In the above embodiment, when all the MCU units 11 are upgraded, one upgrade file packet may be sent to the ethernet control unit 12 through the external device to complete the upgrade of all the MCU units 11, at this time, there may be only one third source host, and there may be multiple third target hosts at the same time, where the upgrade file packet may include multiple fifth data frames, and each fifth data frame is used to complete the upgrade of a corresponding one of the MCU units 11. The ethernet control unit 12 sequentially reads the first fifth data frame, acquires the MAC address of the corresponding MCU unit 11 from the first fifth data frame, searches the corresponding port, forwards the first fifth data frame to the corresponding MCU unit 11, reads the second fifth data frame, acquires the MAC address of the corresponding MCU unit 11 from the second fifth data frame, searches the corresponding port, forwards the second fifth data frame to the corresponding MCU unit 11, and finishes upgrading of all MCU units 11 in the upgrade file packet until the last fifth data frame in the upgrade file packet is forwarded to the corresponding MCU unit 11, thereby realizing quick upgrade of all MCU units 11 by external devices, and having simple operation.
For example, if the external device is a test device/control device, the external device may implement one-key upgrade for all MCU units 11 through the external hardware communication interface unit 13 and the ethernet control unit 12, and the external device may control all MCU units to complete the upgrade according to the upgrade file packet by sending the upgrade file packet including the MAC addresses of all MCU units 11 to all MCU units 11 through a unified network port.
Referring to fig. 4, the external hardware communication interface unit 13 disclosed in the embodiment of the present invention includes a network port isolation transformer and a network interface; the network port isolation transformer is connected with the Ethernet control unit 12 and is also connected with a network interface, and the network interface is also used for connecting with external equipment so as to realize that all MCU units 11 are connected with the external equipment through one network port, thereby reducing the design complexity of a hardware interface and reducing the cost of hardware.
Specifically, the MCU 11 sends the data frame to the ethernet control unit 12 through the first digital interface, the ethernet control unit 12 identifies the corresponding port through the MAC address of the target host, then converts the digital data frame into analog data (in the form of differential pair output), and then outputs the analog data in the form of a network cable after 1:1 conversion processing in the network port isolation transformer, so as to realize data transmission.
The network interface may be, for example, an RJ45.
Referring to fig. 5, fig. 5 is a flow chart of a communication control method of multiple MCU units according to an embodiment of the present invention; as shown in fig. 5, the method for controlling communication of multiple MCU units is applied to the system for controlling communication of multiple MCU units shown in any one of fig. 2 to 4, and the method may include:
501. the ethernet control unit receives a data frame sent by the source host, the data frame indicating the target host.
Specifically, the data frame includes the MAC address of the source host and the MAC address of the target host.
502. The ethernet control unit forwards the data frame to the target host.
When the source host is an MCU unit, the target host is an external device, and when the source host is an external device, the target host is an MCU unit.
Specifically, the ethernet control unit may forward the data frame to the target host according to the MAC address of the target host.
The communication control method of the multiple MCU units provided by the embodiment of the invention is applied to the system shown in fig. 2, 3 or 4, and the system comprises an Ethernet control unit, an external hardware communication interface unit and two or more MCU units, wherein each MCU unit is in communication connection with the Ethernet control unit, the Ethernet control unit is also in communication connection with the external hardware communication interface unit, the external hardware communication interface unit is in communication connection with external equipment, and the Ethernet control unit can realize data forwarding between the MCU unit and the external equipment; therefore, by implementing the embodiment of the invention, the plurality of MCU units are connected to one Ethernet control unit, namely the plurality of MCU units are connected to one network port, so that the data forwarding between the MCU units and external equipment or the MCU units can be realized by using one Ethernet control unit on the premise of ensuring that each MCU unit is kept as the network port for external communication, the number of the network ports is reduced, and the design complexity of a hardware interface is reduced, thereby reducing the hardware cost.
Referring to fig. 6, fig. 6 is a flow chart of a communication control method of multiple MCU units according to a second embodiment of the present invention; in fig. 6, the method may include the steps of:
601. in the initialization process, the Ethernet control unit receives a first data frame sent by a first source host, forwards the first data frame to a first target host, receives a second data frame sent by the first target host aiming at the first data frame, forwards the second data frame to the first source host, acquires the MAC address of the first source host from the first data frame and acquires the MAC address of the first target host from the second data frame.
In the initialization process, the Ethernet control unit acquires the MAC address of the first source host and the MAC address of the first target host by combining the first data frame sent by the first source host and the second data frame sent by the first target host so as to learn the MAC address.
602. The Ethernet control unit establishes a mapping relation between the MAC address of the first source host and the port of the first source host and establishes a mapping relation between the MAC address of the first target host and the port of the first target host in the established MAC address table.
At the time of initialization, the ethernet control unit 12 creates a MAC address table locally, and saves the mapping relationship between the MAC address and the port through the MAC address table. In the embodiment of the present invention, the ethernet control unit 12 performs learning of the MAC address of the MCU unit 11 and the MAC address of the external device in the initialization process, specifically, in the initialization process, when the ethernet control unit 12 receives the first data frame sent by the first source host, the MAC address of the first source host is obtained from the first data frame, then the MAC address of the first target host is obtained from the second data frame sent by the first target host for the first data frame, each host has a corresponding port (i.e., a data port), and then the mapping relationship between the MAC address of the host and the port is saved in the MAC address table, so that the ethernet control unit 12 can quickly locate the port according to the MAC address of the target host carried by the data frame during normal communication, thereby realizing quick data transmission.
603. And the Ethernet control unit receives a third data frame sent by the second source host in the communication process after the initialization is completed.
604. The Ethernet control unit buffers the third data frame into a local data storage unit.
605. The Ethernet control unit detects whether other data frames to be forwarded in the data storage unit are already forwarded, wherein the other data frames to be forwarded are data frames which are received by the Ethernet control unit before the receiving time of the third data frame and are cached in the data storage unit; wherein, after determining that other data frames to be forwarded have been forwarded, the process goes to step 606; when there are other data frames to be forwarded that are not forwarded, then other data frames to be forwarded are waited for until all other data frames to be forwarded are forwarded, and step 606 is performed.
For the third data frame received from the second source host, the ethernet control unit 12 firstly caches the third data frame in the data storage unit, further detects whether other data frames to be forwarded received before exist, and if the other data frames to be forwarded exist, processes the other data frames to be forwarded according to the time sequence of the received data frames before processing the third data frame.
606. The Ethernet control unit obtains the MAC address of the second target host from the third data frame.
607. And the Ethernet control unit searches a first port matched with the MAC address of the second target host according to the mapping relation between the MAC address and the ports in the MAC address table.
608. The Ethernet control unit forwards the third data frame to the second target host through the first port.
The schemes of steps 501 and 502 shown in fig. 5 may specifically include implementation steps 603 to 608 of the embodiment of the present invention, after the ethernet control unit 12 completes initialization, the ethernet control unit 12 enters a normal communication flow, reads the MAC address of the second target host from the third data frame after receiving the third data frame, and finds the first port of the second target host according to the mapping relationship between the MAC address and the port in the MAC address table, so as to forward the first data frame to the first target host.
It can be seen that, by implementing the above embodiment, by using the cooperation of the ethernet control unit 12 and the external hardware communication interface unit 13, all the MCU units 11 are connected to one network port, and meanwhile, the ethernet control unit 12 can complete learning of the MAC address, so as to use the learned MAC address table to realize forwarding of data between the MCU units 11 and the external device, thereby implementing that all the MCU units complete communication with the external device through one network port, and reducing the number of hardware interfaces, thereby reducing design complexity of the hardware interfaces and hardware cost.
Further, the ethernet control unit is further configured to, after forwarding the third data frame to the second target host through the first port, obtain, when receiving a fourth data frame sent by the second target host for the third data frame, an MAC address of the second source host from the fourth data frame, find, according to a mapping relationship between the MAC address and the port in the MAC address table, a second port matching the MAC address of the second source host, and forward the fourth data frame to the second source host through the second port.
In the above embodiment, after the second source host sends the third data frame to the second target host, if the second target host needs to feed back the fourth data frame for the third data frame, the ethernet control unit 12 sends the fourth data frame to the second source host again, so as to implement the back-and-forth communication interaction between the second source host and the second target host.
The communication control system of the multiple MCU units disclosed in the embodiment of the present invention may be applied to a vehicle or a flight device (unmanned aerial vehicle, etc.), that is, the embodiment of the present invention discloses a vehicle, which may include the communication control system of the multiple MCU units described above, and the embodiment of the present invention also discloses a flight device, which may include the communication control system of the multiple MCU units described above.
Further, the embodiment of the invention also discloses a vehicle, which can comprise:
a memory storing executable program code;
a processor coupled to the memory;
wherein the processor invokes executable program code stored in the memory to perform some or all of the steps of a multi-MCU communication control method as shown in fig. 4.
Further, the embodiment of the invention also discloses a flying device, which can comprise:
a memory storing executable program code;
a processor coupled to the memory;
wherein the processor invokes executable program code stored in the memory to perform some or all of the steps of a multi-MCU communication control method of fig. 5 or 6.
The embodiment of the invention also discloses a computer readable storage medium storing a computer program, wherein the computer program causes a computer to execute the communication control method of multiple MCU units disclosed in fig. 5 or 6.
Embodiments of the present invention also disclose a computer program product which, when run on a computer, causes the computer to perform some or all of the steps of any of the methods disclosed in fig. 5 or 6.
The embodiment of the invention also discloses an application release platform which is used for releasing a computer program product, wherein when the computer program product runs on a computer, the computer is caused to execute part or all of the steps of any one of the methods disclosed in fig. 5 or 6.
Those of ordinary skill in the art will appreciate that all or part of the steps of the various methods of the above embodiments may be implemented by a program that instructs associated hardware, the program may be stored in a computer readable storage medium including Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), programmable Read-Only Memory (Programmable Read-Only Memory, PROM), erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), one-time programmable Read-Only Memory (OTPROM), electrically erasable programmable Read-Only Memory (EEPROM), compact disc Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM) or other optical disk Memory, magnetic disk Memory, tape Memory, or any other medium that can be used for carrying or storing data that is readable by a computer.
The above describes in detail a communication control system and a communication control method for multiple MCU units disclosed in the embodiments of the present invention, and specific examples are applied herein to illustrate the principles and embodiments of the present invention, where the above description of the embodiments is only for helping to understand the method and core ideas of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (10)
1. A communication control system for a plurality of MCU units, comprising:
two or more MCU units;
the Ethernet control unit is in communication connection with each MCU unit;
the external hardware communication interface unit is respectively in communication connection with the Ethernet control unit and the external equipment;
the Ethernet control unit is used for realizing data forwarding between the MCU unit and the external device according to an established MAC address table, wherein the MAC address table stores the mapping relation between the MAC address of the source host and the port of the source host and the mapping relation between the MAC address of the target host and the port of the target host, and when the source host is the MCU unit, the target host is the external device, and when the source host is the external device, the target host is the MCU unit.
2. The communication control system of claim 1, wherein each of the MCU units is communicatively coupled to the ethernet control unit via a corresponding first data interface.
3. The communication control system according to claim 1 or 2, characterized in that:
the ethernet control unit is further configured to receive a first data frame sent by a first source host, forward the first data frame to a first target host, receive a second data frame sent by the first target host for the first data frame, forward the second data frame to the first source host, obtain a media access control MAC address of the first source host from the first data frame and obtain a MAC address of the first target host from the second data frame, establish a mapping relationship between the MAC address of the first source host and a port of the first source host in an established MAC address table, and establish a mapping relationship between the MAC address of the first target host and a port of the first target host, when the first source host is the MCU unit, the first target host is the external device, and when the first source host is the external device, the first target host is the MCU unit.
4. A communication control system according to claim 3, wherein the ethernet control unit is configured to implement data forwarding between the MCU unit and the external device by:
and in the communication process after the Ethernet control unit finishes initialization, receiving a third data frame sent by a second source host, acquiring an MAC address of a second target host from the third data frame, searching a first port matched with the MAC address of the second target host according to the mapping relation between the MAC address and the port in the MAC address table, and forwarding the third data frame to the second target host through the first port, wherein when the second source host is the MCU unit, the second target host is the external equipment, and when the second source host is the external equipment, the second target host is the MCU unit.
5. The communication control system according to claim 4, wherein:
and the Ethernet control unit is further configured to, after forwarding the third data frame to the second target host through the first port, obtain, from a fourth data frame, the MAC address of the second source host when the fourth data frame sent by the second target host for the third data frame is received, find, according to the mapping relationship between the MAC address and the port in the MAC address table, a second port matching the MAC address of the second source host, and forward the fourth data frame to the second source host through the second port.
6. The communication control system according to claim 4, wherein:
the ethernet control unit is further configured to buffer a third data frame sent by the second source host into a local data storage unit after the third data frame is received, and when it is detected that other data frames to be forwarded are already forwarded, execute the step of obtaining the MAC address of the second target host from the third data frame, where the other data frames to be forwarded are data frames received by the ethernet control unit before the receiving time of the third data frame and buffered into the data storage unit.
7. A communication control system according to claim 3, wherein the ethernet control unit is configured to implement a manner between the MCU unit and the external device by:
and in the communication process after the Ethernet control unit finishes initialization, receiving an upgrade file packet sent by a third source host, sequentially obtaining a fifth data frame from the upgrade file packet, obtaining an MAC address of a third target host from the fifth data frame, searching a third port matched with the MAC address of the third target host according to the mapping relation between the MAC address and the port in the MAC address table, and sending the fifth data frame to the corresponding third target host through the third port, wherein the third source host is the external equipment, the third target host is the MCU unit, the upgrade file packet comprises at least one fifth data frame, one fifth data frame indicates one third target host, and any two third target hosts indicated by the fifth data frames are different.
8. The communication control system according to claim 4, wherein:
when the second source host is the MCU unit, the second target host is other MCU units except the second source host;
the Ethernet control unit is also used for realizing data forwarding between the MCU units.
9. The communication control system of claim 1, wherein the external hardware communication interface unit comprises a network port isolation transformer and a network interface;
the network port isolation transformer is connected with the Ethernet control unit and the network interface;
the network interface is also connected with the external device.
10. The communication control method of the multi-MCU unit is characterized by being applied to a communication control system of the multi-MCU unit, wherein the communication control system of the multi-MCU unit comprises two or more MCU units, an Ethernet control unit and an external hardware communication interface unit, the Ethernet control unit is in communication connection with each MCU unit, and the external hardware communication interface unit is in communication connection with the Ethernet control unit and an external device respectively; the method comprises the following steps:
the Ethernet control unit receives a data frame sent by a source host, wherein the data frame indicates a target host;
The Ethernet control unit forwards the data frame to the target host according to an established MAC address table, wherein the MAC address table stores the mapping relation between the MAC address of the source host and the port of the source host and the mapping relation between the MAC address of the target host and the port of the target host;
when the source host is the MCU unit, the target host is the external device, and when the source host is the external device, the target host is the MCU unit.
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