CN113282040B - Method and device for reducing frame loss in forwarding of finished automobile gateway - Google Patents
Method and device for reducing frame loss in forwarding of finished automobile gateway Download PDFInfo
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- CN113282040B CN113282040B CN202110576070.1A CN202110576070A CN113282040B CN 113282040 B CN113282040 B CN 113282040B CN 202110576070 A CN202110576070 A CN 202110576070A CN 113282040 B CN113282040 B CN 113282040B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—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
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25257—Microcontroller
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—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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Abstract
The invention relates to a method and a device for reducing frame loss caused by forwarding of a finished automobile gateway.A microcontroller MCU receives a control instruction sent by a performance controller SOC and analyzes the control instruction into a CAN message to be sent to a finished automobile CAN network; the microcontroller MCU judges whether the data in the first cache is full, if not, the CAN message is stored in the first cache; the microcontroller MCU judges whether the data in the second cache is full, if not, the CAN message is stored in the second cache; and if so, abandoning the CAN message storage. The invention can effectively solve the problem of frame loss when the gateway forwards a large amount of data.
Description
Technical Field
The invention relates to a method and a device for reducing frame loss caused by forwarding of a whole vehicle gateway.
Background
With the popularization of the whole vehicle domain controller architecture, the importance of the gateway function belonging to a part of the domain controller function is more and more important. At present, the whole architecture of a domain controller is a combination form of a microcontroller MCU and a performance controller SOC, an Autosar operating system is carried on the MCU and is mainly responsible for the real-time task of a whole vehicle and is communicated with a CAN, a LIN and an Ethernet network of the whole vehicle; and the Soc is loaded with a QNX or Linux operating system which is mainly responsible for the tasks related to domain controller calculation.
The gateway function is deployed on the MCU, and the main task is to read the signals of the CAN network of the whole vehicle and send the signals to the SOC through the Ethernet for data calculation; after the SOC is calculated, some control instructions of the whole vehicle are generated and need to be sent to the MCU through the Ethernet, and the MCU analyzes the control instructions into CAN messages and sends the CAN messages to the CAN network of the whole vehicle. The transmission rate of the vehicle-mounted Ethernet is mostly 100M/s or 1000M/s, the transmission rate of the CAN network is mostly 500K/s, and the transmission rate is over one hundred times, so that a large number of Ethernet control command messages need to be forwarded to the CAN network by a gateway (MCU) at a certain moment, and the transmission rate of the CAN network is limited, and the gateway (MCU) has no capacity of storing a large number of Ethernet messages, so that the gateway CAN forward lost frames.
When designing a CAN module, MCU chip manufacturers consider the condition that CAN message frame loss is caused by a slightly low CAN transmission rate, and therefore the MCU chip manufacturers set a CAN hardware cache at the bottom layer of the CAN module for temporarily storing messages which cannot be sent to a CAN bus. However, the CAN hardware buffer is not set too large, and when a large amount of data needs to be forwarded and the storage space of the CAN hardware buffer exceeds, the problem of forwarding frame loss still occurs.
Disclosure of Invention
The invention aims to provide a method and a device for reducing frame loss in the forwarding of a whole vehicle gateway, which can effectively solve the problem of frame loss when the gateway forwards a large amount of data.
Based on the same inventive concept, the invention has two independent technical schemes:
1. a method for reducing frame loss of finished automobile gateway forwarding comprises the following steps:
step 10: the method comprises the following steps that a microcontroller MCU receives a control instruction sent by a performance controller SOC, and analyzes the control instruction into a CAN message to be sent to a whole vehicle CAN network;
step 20: the microcontroller MCU judges whether the data in the first cache is full, if not, the CAN message is stored in the first cache; if yes, go to step 30;
step 30: the microcontroller MCU judges whether the data in the second cache is full, if not, the CAN message is stored in the second cache; and if so, abandoning the CAN message storage.
Further, in step 10, the microcontroller MCU converts the received ethernet message into a CAN message, or directly receives the CAN message through the CAN network.
Further, step 10 and step 20 include:
step 15: judging whether the data in the second cache is empty, if so, entering the step 20; if not, step 30 is entered.
Further, the CAN message in the first cache is forwarded to the CAN network in preference to the CAN message in the second cache.
Further, the first cache is a CAN hardware cache of the MCU.
Further, the second cache is a cache space independently arranged on a RAM of the microcontroller MCU.
2. A device for reducing forwarding frame loss of a finished automobile gateway comprises a microcontroller MCU and a performance controller SOC, wherein the microcontroller MCU is used for receiving a control instruction sent by the performance controller SOC and analyzing the control instruction into a CAN message to be sent to a finished automobile CAN network,
the microcontroller MCU comprises a first cache and a second cache, wherein the first cache is a CAN hardware cache of the microcontroller MCU, and the second cache is a cache space independently arranged on an RAM of the microcontroller MCU;
the microcontroller MCU preferentially stores the received CAN message in a first cache, and when the first cache is full, the CAN message is stored in a second cache; and if the second cache is full, the storage of the CAN message is abandoned. .
Further, the microcontroller MCU first determines whether the data in the second buffer is empty, and if not, stores the data in the second buffer.
Further, the CAN message in the first cache is forwarded to the CAN network in preference to the CAN message in the second cache.
The invention has the following beneficial effects:
the MCU comprises a first cache and a second cache, wherein the first cache is a CAN hardware cache of the MCU, the second cache is a cache space independently arranged on an RAM of the MCU, and when the data in the first cache is full, the data is stored in the second cache, so that the storage space of the data to be forwarded is increased, and the problem of frame loss when a gateway forwards a large amount of data is effectively solved. In addition, the invention does not need to add a hardware storage device, thereby effectively saving the cost.
The CAN message in the first cache is transmitted to the CAN network in preference to the CAN message in the second cache, whether the data in the second cache is empty is judged firstly, if not, the data storage condition of the first cache is not needed to be judged, and the data is directly stored in the second cache, so that the program is effectively reduced, and the data storage speed is improved.
In the interruption stage after the CAN message is sent, whether the CAN message is stored in the second cache is checked, if so, the CAN message is transferred from the second cache to the first cache, and when the message is sent again next time, the program for transferring the data from the second cache to the first cache is saved, and the data forwarding speed is improved.
Drawings
FIG. 1 is a general flow diagram of the process of the present invention;
fig. 2 is a flow chart of the interrupt phase after the method of the present invention has sent a CAN message.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.
The first embodiment is as follows:
method for reducing frame loss in forwarding of whole vehicle gateway
A method for reducing frame loss of finished automobile gateway forwarding comprises the following steps:
step 10: the method comprises the following steps that a microcontroller MCU receives a control instruction sent by a performance controller SOC, and analyzes the control instruction into a CAN message to be sent to a whole vehicle CAN network;
the microcontroller MCU converts the received ethernet message (control command) into a CAN message, or directly receives the CAN message through a CAN network.
Step 15: the microcontroller MCU judges whether the data in the second cache is empty, if so, the step 20 is carried out; if not, go to step 30;
the second cache (software cache) is a cache space independently arranged on the RAM of the microcontroller MCU.
Step 20: the microcontroller MCU judges whether the data in the first cache is full, if not, the CAN message is stored in the first cache; if yes, go to step 30;
the first cache (hardware cache) is a CAN hardware cache of the MCU.
Step 30: the microcontroller MCU judges whether the data in the second cache is full, if not, the CAN message is stored in the second cache; and if so, abandoning the CAN message storage.
And the CAN message in the first cache is forwarded to the CAN network in preference to the CAN message in the second cache.
In specific implementation, as shown in fig. 1, the circuit (r), (c): firstly, after receiving the Ethernet message, the MCU converts the Ethernet message into the format of the CAN message according to the self-defined conversion protocol of the Ethernet message and the CAN message. And then checking the current condition of the second cache (software cache), if the second cache (software cache) is empty, judging whether the first cache (hardware cache) is full, if not, directly pressing the data into the first cache (hardware cache) to prepare for data transmission. (ii) a circuit (c) is (c): the line checks the first cache (hardware cache) in the seventh step, finds that the first cache (hardware cache) is full, and at this time, in order to avoid frame loss, directly stores the data in the second cache (software cache), so that it is checked whether the second cache (software cache) is full, if not, the second cache (software cache) is smoothly placed into the second cache (software cache), and if so, the current storage reaches the upper limit of the gateway, and only the message can be discarded. The circuit is divided into two parts: in the sixth step, the line checks whether the second cache (software cache) is empty, and the CAN message is directly placed in the second cache (software cache) if the second cache (software cache) is not empty, so that the purpose of sending the CAN message is mainly to enable the message to be sent according to a first-in first-out rule, and the consistency of the sending sequence is ensured.
As shown in fig. 2, in the interrupt stage after sending a CAN message, it is checked whether the second cache stores the CAN message, and if so, the CAN message is transferred from the second cache to the first cache.
In specific implementation, after the CAN controller finishes sending a CAN message, the process enters the CAN sending completion interruption, whether data exists in the second cache (software cache) is checked, if the data does not exist, the interruption is directly finished, otherwise, the data in the second cache (software cache) is directly pressed into the first cache (hardware cache), and the interruption is finished. Before the data in the second cache (software cache) is pressed into the first cache (hardware cache), the condition of the first cache (hardware cache) is not judged, mainly because only in the process of sending completion interruption of the CAN, the CAN controller must show that a CAN message is taken out from the first cache (hardware cache), so that the condition that the cache is full and cannot be pressed when the data in the second cache (software cache) is pressed into the first cache (hardware cache) does not occur. It is desirable to reduce unnecessary decisions in the interrupt handling function so that the interrupt time can be reduced and the impact on other functions can be minimized.
The flows are directed at the forwarding from the Ethernet to the CAN message, and are also suitable for the forwarding from the CAN message to the CAN message, and the flows are only put in the interruption of the receiving of the CAN message for processing, so that the CAN message CAN be processed preferentially to the maximum extent, and the forwarding delay is reduced.
Example two:
device for reducing frame loss in forwarding of whole vehicle gateway
Comprises a microcontroller MCU and a performance controller SOC, wherein the microcontroller MCU is used for receiving a control instruction sent by the performance controller SOC and analyzing the control instruction into a CAN message to be sent to a CAN network of the whole vehicle,
the microcontroller MCU comprises a first cache and a second cache, wherein the first cache is a CAN hardware cache of the microcontroller MCU, and the second cache is a cache space independently arranged on an RAM of the microcontroller MCU;
the microcontroller MCU preferentially stores the received CAN message in a first cache, and when the first cache is full, the CAN message is stored in a second cache; and if the second cache is full, the storage of the CAN message is abandoned. .
And the microcontroller MCU firstly judges whether the data in the second cache is empty or not, and if not, stores the data into the second cache.
And the CAN message in the first cache is forwarded to the CAN network in preference to the CAN message in the second cache. .
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (6)
1. A method for reducing frame loss of finished automobile gateway forwarding is characterized by comprising the following steps:
step 10: the method comprises the following steps that a microcontroller MCU receives a control instruction sent by a performance controller SOC, and analyzes the control instruction into a CAN message to be sent to a whole vehicle CAN network;
step 20: the microcontroller MCU judges whether the data in the first cache is full, if not, the CAN message is stored in the first cache; if yes, go to step 30;
step 30: the microcontroller MCU judges whether the data in the second cache is full, if not, the CAN message is stored in the second cache; if yes, abandoning the CAN message storage;
the steps 10 and 20 include:
step 15: judging whether the data in the second cache is empty, if so, entering the step 20; if not, go to step 30;
and the CAN message in the first cache is forwarded to the CAN network in preference to the CAN message in the second cache.
2. The method for reducing frame loss due to vehicle gateway forwarding according to claim 1, wherein: in step 10, the microcontroller MCU converts the received ethernet message into a CAN message, or directly receives the CAN message through a CAN network.
3. The method for reducing frame loss due to vehicle gateway forwarding according to claim 1, wherein: the first cache is a CAN hardware cache of the MCU.
4. The method for reducing frame loss due to vehicle gateway forwarding according to claim 1, wherein: the second cache is a cache space independently arranged on the RAM of the microcontroller MCU.
5. The method for reducing frame loss of gateway forwarding of whole vehicle according to any one of claims 1 to 4, characterized in that: and in the interruption stage after one CAN message is sent, the microcontroller checks whether the second cache stores the CAN message or not, and if so, transfers the CAN message from the second cache to the first cache.
6. The utility model provides a reduce device that whole car gateway forwarded frame loss, includes microcontroller MCU and performance controller SOC, microcontroller MCU is used for receiving the control command that performance controller SOC sent, and will control command is parsed into the CAN message in order sending whole car CAN network, its characterized in that:
the microcontroller MCU comprises a first cache and a second cache, wherein the first cache is a CAN hardware cache of the microcontroller MCU, and the second cache is a cache space independently arranged on an RAM of the microcontroller MCU;
the microcontroller MCU preferentially stores the received CAN message in a first cache, and when the first cache is full, the CAN message is stored in a second cache; if the second cache is full, the storage of the CAN message is abandoned;
the microcontroller MCU firstly judges whether the data in the second cache is empty, and if not, the data are stored in the second cache;
and the CAN message in the first cache is forwarded to the CAN network in preference to the CAN message in the second cache.
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