CN113961212A - OTA installation package deployment method and system based on Ethernet and method for upgrading vehicle controller - Google Patents
OTA installation package deployment method and system based on Ethernet and method for upgrading vehicle controller Download PDFInfo
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Abstract
The invention relates to an OTA installation package deployment method and system based on Ethernet and a method for upgrading a vehicle controller, wherein the method comprises the following steps: the lower computer puts the deployment packet sub-package into a corresponding small cache block from the head of the annular buffer area; the lower computer updates the data header information of the small cache block; the lower computer takes out a small cache block from the tail part of the annular buffer area; the lower computer checks and stores the deployment packet sub-packets according to the header information of the small cache blocks; the lower computer backfills the information related to response in the data header in the small cache block; the lower computer starts a response mechanism and inquires whether the ring buffer area needs to process response or not; the lower computer acquires response information of the small cache block needing to be responded; the lower computer sends a response message to the upper computer; and the upper computer inquires and confirms the response message. The invention has short time for deploying the installation package and occupies less equipment cache in the deploying process.
Description
Technical Field
The invention belongs to the technical field of vehicle control OTAs (over the air) of vehicles, and particularly relates to an OTA (over the air) installation package deployment and vehicle controller upgrading technology based on Ethernet.
Background
Along with the change of times, the user requirements increase, the requirements of the user on the automobile functions are more and more, the automobile software functions are gradually increased, particularly, the OTA functions become basic function services provided by the automobile, but along with the increase of automobile control and vehicle-mounted equipment, the automobile function requirements increase, software packages of the vehicle control and vehicle-mounted equipment increase, the occupied time and the occupied hardware resources of the OTA in the deployment process greatly increase, so that the development difficulty of controller software is increased, the side length of the OTA overall upgrading time is long, and the experience of the user is poor.
Chinese patent publication No. CN112104721A discloses a technology entitled "an OTA remote upgrade file downloading method", which uses HTTP (hypertext transfer protocol) as a transmission channel, and transmits data according to a HTTP protocol POST mechanism, and packetizes data packets during the downloading process of the file, each data packet is less than or equal to 300kb, receives each packet through the HTTP protocol, then verifies the packetization, and transmits the next packetization after no error is verified, and repeats this until the entire data packet is downloaded, and then writes the downloaded data packet into a designated FLASH, and then performs remote upgrade through a command. According to the HTTP protocol, the download flow of the whole data has much waiting synchronization time, the time period for downloading the whole data is too long, the speed is influenced definitely, according to the HTTP protocol, the download speed of each sub-package is directly influenced, the data package is reduced, the utilization rate of the data block is reduced, the data package is increased, the requirement for hardware cache is increased, and the development difficulty of software and hardware is increased.
The existing OTA deployment flow scheme mainly uses Ethernet as a transmission path, an upper computer and a lower computer adopt the existing transmission protocol to transmit data packets, the upper computer and the lower computer agree to use a large data cache block (usually more than dozens of k) for storing sub-packets of the whole installation packet in the transmission process, after the transmission of each sub-packet is completed, the lower computer sends a response to inform the upper computer to transmit the next sub-packet, so as to poll the sub-packet until the whole upgrade packet is successfully deployed into the lower computer, and the deployment flow is finished.
Because a large data cache block (usually more than tens of k) is needed to cache the sub-packets of the deployment packet in the deployment process, the required cache area becomes very large in the deployment process using a single or multiple TCP channels, which inevitably increases the requirement on hardware, and thus, many devices may increase the development difficulty in order to meet the requirement.
In the transmission process of the large data block, due to the TCP/IP characteristic and a single-packet response mechanism, the lower computer does not send any data before the current packet is responded, and the whole data transmission process is in a semi-idle state, so that the time overhead is increased; secondly, the access of large data blocks by the file system also requires a long time to process.
Disclosure of Invention
The invention aims to provide an OTA installation package deployment method and system based on Ethernet and a method for upgrading a vehicle controller, and solves the technical problems that:
in the OTA installation package deployment process based on the Ethernet, a large data cache block (usually more than dozens of k) is required to cache and deploy package subpackages, and in the deployment process of a practical single or multiple TCP channels, the requirement of a cache area is high on hardware, and the development difficulty is high;
in the transmission process of the large data block, due to the TCP/IP characteristic and a single-packet response mechanism, the upper computer cannot send any data before the lower computer does not respond to the current packet, the whole data transmission process is in a semi-idle state, the time overhead is increased, and the file system needs to process the access of the large data block for a long time.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: an OTA installation package deployment method based on Ethernet comprises the following steps:
s01: the upper computer checks the deployment condition, and executes the next step when the condition is met;
s02: the upper computer sends the deployment packet to the lower computer;
s03: the lower computer receives the deployment package sub-package;
s04: the lower computer puts the deployment packet into a corresponding small cache block from the head of an annular buffer zone, and the annular buffer zone is formed by connecting a plurality of small cache blocks into an annular shape;
s05: the lower computer updates the data header information of the small cache block;
s06: the lower computer takes out the small cache block from the tail part of the annular buffer area;
s07: the lower computer checks and stores the deployment packet sub-packets according to the header information of the small cache blocks;
s08: the lower computer backfills information related to response in a data header in the small cache block;
s09: the lower computer starts a response mechanism and inquires whether the ring buffer area needs to process response or not;
s10: the lower computer acquires response information of the small cache block needing to be responded;
s11: the lower computer sends a response message to the upper computer;
s12: the upper computer inquires and confirms the response message;
s13: and circulating the steps until the transmission of the whole deployment package is completed.
Preferably, the first and second electrodes are formed of a metal,
in S04, after receiving the first deployment packet sub-package of the upper computer, the lower computer puts the deployment packet sub-package into the first small cache block, and adds the first small cache block to the location where the deployment packet sub-package of the ring buffer is stored, where the storage location of the deployment packet sub-package still points to the header, and the location where the deployment packet sub-package is taken out points to the first small cache block.
Preferably, the first and second electrodes are formed of a metal,
in S05, after the lower computer obtains the first deployment packet sub-package, the length and number of the small cache block in the small cache block are updated according to the sequence of the received deployment packet sub-packages and the size of the deployment packet sub-packages.
Preferably, the first and second electrodes are formed of a metal,
in S06, the ring buffer has three small cache blocks, the deployed packet taking position points to the first small cache block, the first small cache block is taken when the deployed packet is taken out from the ring buffer, the deployed packet taking position points to the second small cache block, and the second small cache block is taken out until all the deployed packet is taken out.
Preferably, the first and second electrodes are formed of a metal,
in the S04, the size of the small cache block is smaller than a maximum value of a Maximum Transmission Unit (MTU) of the lower computer.
Preferably, the first and second electrodes are formed of a metal,
in S04, the small cache block includes a data header, a data field, and a data trailer;
the data head comprises a head mark, a data field length, a data block number, a data block response block number, a link point, a data block response state, a data field check code and a response level.
Preferably, the first and second electrodes are formed of a metal,
the size of the deployment packet sub-package does not exceed the size of a single small cache block data field.
Preferably, the first and second electrodes are formed of a metal,
in S04, the sum of the sizes of the small buffer blocks constituting the ring buffer is nk, and n is smaller than 10.
The invention also provides an OTA installation package deployment system based on the Ethernet, which comprises the following components:
the inspection module is used for inspecting the deployment condition by the upper computer;
the first sending module is used for sending the deployment packet sub-package to the lower computer by the upper computer;
the receiving module is used for receiving the deployment package sub-package by the lower computer;
the storing module is used for the lower computer to put the deployment packet sub-package into the corresponding small cache block from the head of the annular buffer area;
an update module: the lower computer is used for updating the data header information of the small cache block;
taking out the module: the lower computer is used for taking out the small cache block from the tail part of the ring buffer area;
checking the storage module: the lower computer checks and stores the deployment packet sub-packets according to the header information of the small cache blocks;
a backfill module: the lower computer is used for backfilling the information related to response in the data header in the small cache block;
the first query module is used for the lower computer to start a response mechanism and query whether the ring buffer needs to process a response or not;
the acquisition module is used for acquiring response information of the small cache blocks needing to be responded by the lower computer;
the second sending module is used for sending a response message to the upper computer by the lower computer;
the second query module is used for the upper computer to query the response message;
and the confirmation module is used for confirming the response message by the upper computer.
Preferably, the first and second electrodes are formed of a metal,
the size of the small cache block is smaller than the maximum value of the Maximum Transmission Unit (MTU) of the lower computer;
the small cache block comprises a data head, a data field and a data tail;
the data head comprises a head mark, a data field length, a data block number, a data block response block number, a link point, a data block response state, a data field check code and a response level;
the size of the deployment packet sub-package does not exceed the size of a single small cache block data field.
Preferably, the first and second electrodes are formed of a metal,
a plurality of small buffer blocks are connected to form the ring buffer area;
the sum of the sizes of a plurality of small cache blocks forming the annular buffer area is nk, and n is less than 10.
The invention also provides a method for upgrading the vehicle controller, which comprises the OTA installation package deployment method based on the Ethernet.
By adopting the technical scheme, the invention has the following beneficial technical effects: in the invention, a plurality of small cache blocks (the total cache occupation is controlled within less than 10 k) which do not exceed the Maximum Transmission Unit (MTU) are used instead for replacing the original large data cache block (usually more than dozens of k), and the requirement on hardware cache resources is reduced in the deployment process of a single or a plurality of TCP channels, thereby reducing the design requirement of hardware, improving the software development efficiency and increasing the software development flexibility. Due to the reduction of the size of the cache block, the data storage time is reduced and the whole flow rate is accelerated in the process of storing data in the file system;
the single-packet synchronous response mechanism of the original deployment flow is practical, so that the time of the whole deployment flow is not fully used, the single-packet synchronous response mechanism is adjusted to be indefinite-packet asynchronous response, the waiting time in the original flow is fully utilized, data packets are continuously sent in the waiting time, namely, a lower computer does not immediately start response, the head information of a corresponding small cache block is stored from the head of an annular buffer area, the sub-packets of the data packets are verified and stored, the lower computer backfills the data heads in the small cache blocks to respond relevant information, the lower computer starts the response mechanism to inquire whether the annular buffer area needs to process response, the lower computer obtains the response information of the small cache blocks needing to respond, the lower computer sends response messages to the upper computer, and the upper computer inquires and confirms the response messages. And an indefinite packet response mechanism of the lower computer is used for ensuring that the process is normally carried out and is repeated in sequence, so that the deployment of the upgrade packet is completed, and the deployment time of the whole upgrade packet is shortened.
Drawings
FIG. 1 is the contents of a small cache block of the present invention;
FIG. 2 is a diagram of a ring buffer according to the present invention;
FIG. 3 is a flow chart of the upper computer packet sending of the present invention;
FIG. 4 is a flow chart of the host computer response packet inspection according to the present invention;
FIG. 5 is a flow chart of the lower computer receiving a packet according to the present invention;
fig. 6 is a flow chart of the lower computer asynchronous data response according to the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
The invention mainly achieves the technical effects that: the deployment package (installation package) is faster and the occupied equipment (lower computer) cache is smaller in the deployment process.
The invention provides an OTA installation package deployment method based on Ethernet, which comprises the following steps:
as shown in fig. 3, in a first step, the upper computer checks the deployment condition, and when the condition is satisfied, the next step is performed.
And secondly, the upper computer sends the deployment packet to the lower computer.
In a third step, shown in fig. 5, the lower computer receives the deployment packet sub-package.
And fourthly, the lower computer puts the deployment packet sub-package into the corresponding small cache block from the head of the annular buffer zone.
And fifthly, the lower computer updates the data head information of the small cache block.
And sixthly, taking out the small cache block from the tail part of the ring buffer area by the lower computer.
And seventhly, the lower computer checks and stores the deployment packet sub-packets according to the header information of the small cache blocks.
And eighthly, the lower computer backfills the response related information in the data head in the small cache block.
As shown in fig. 6, in the ninth step, the lower computer starts the response mechanism to inquire whether the ring buffer needs to process the response.
And step ten, the lower computer acquires the response information of the small cache block needing to be responded.
And step ten, the lower computer sends a response message to the upper computer.
As shown in fig. 3 and 4, in the twelfth step, the upper computer queries and confirms the response message.
And step three, the steps are circulated until the whole deployment package is sent.
In order to understand the above flow more clearly, it is illustrated by an example.
As shown in fig. 3, in a first step, the upper computer checks the deployment condition, and when the condition is satisfied, the next step is performed.
And secondly, the upper computer sends the deployment packet to the lower computer.
As shown in fig. 5, the total size of the deployment package is 10k, and the size of each sub-package is 1 k; the size of each small cache block of the lower computer is 1k, the number of the small cache blocks is 20, the serial number of the small cache block is 1-20, wherein 1 represents the first small cache block, 20 represents the last small cache block, the initial state of the ring buffer area does not have any small cache block and only has one buffer head, and the storage position and the data taking-out position of the data point to the buffer head.
And thirdly, the lower computer receives the deployment packet sub-package. A total of 10 packets.
Fourthly, after receiving the first sub-packet of the upper computer, the lower computer puts the data into the small buffer block No. 1, and simultaneously adds the small buffer block No. 1 to the position of the annular buffer area where the data is stored, at the moment, the data storage position also points to the head, and the position where the data is taken out points to the small buffer block No. 1; and so on until all packets are acquired.
And fifthly, after the lower computer obtains the first deployment sub-packet, updating the length 1k and the number 1 of the small cache block in the small cache block according to the sequence of the received sub-packets and the size of the packet, and so on.
And sixthly, assuming that 3 small cache blocks exist in the ring buffer, sequentially: head → 3 → 2 → 1 → head; the data taking position points to the number 1 small cache block, the number 1 small cache block is taken first when the data is taken out from the annular buffer area, then the data taking position points to the number 2, and then the number 2 small cache block is taken out. And so on until the data is all fetched.
A seventh step, assuming that the currently taken out small cache block No. 2 is taken out according to the mode of the sixth step; firstly, data verification is carried out on the small cache blocks, whether the data are wrong or not is judged, and if the data are not wrong, the data are stored into a file system of a lower computer. If there is an error, the current packet is discarded.
Eighthly, collecting the checking result of the No. 2 small cache block in the seventh step, and if the data is wrong, setting the response number of the No. 2 small cache block as 1 to indicate that the data is abnormal; otherwise, setting to 0 indicates no error.
As shown in fig. 6, in the ninth step, the lower computer starts a response mechanism, queries whether the ring buffer needs to process a response, traverses the whole ring buffer, determines whether the data response number of each small buffer block in the ring buffer is 1, and if the data response number is 1, it indicates that a response packet of the small buffer block needs to be sent.
And tenth, assuming that the number 2 small cache block needs to respond now, taking out the header information of the number 2 small cache block, wherein the header information comprises the number of the small cache block, the response number of the small cache block, the size of the small cache block and the like, and forming a response message.
And step ten, the lower computer sends a response message to the upper computer.
As shown in fig. 3 and 4, in the twelfth step, the upper computer receives the response message of the small cache block No. 2, analyzes the header information in the message, the small cache block number and the data response number in the header information, and sends the recombined message to the lower computer.
And step three, the steps are circulated until the whole deployment package is sent.
As shown in fig. 1 and fig. 2, according to the TCP/IP protocol characteristics, considering the Maximum Transmission Unit (MTU) of the device (lower computer) and the TCP frame usage, the small cache blocks are divided into small cache blocks, each of which includes a data header, a data field, and a data trailer (if the device cache is seriously insufficient, the small cache blocks may be discarded).
The data head includes: the system comprises a header identification, a data field length, a data block number, a data block response block number, a link point, a data block response state, a data field check code and a response level.
Specifically, the header content is adjusted accordingly according to the actual device (lower computer), and not all the header content need to be reserved, and the size of each small cache block is smaller than the maximum value of the MTU (maximum transmission unit) of the device.
Management mode of small cache blocks: and applying for the minimum number of small cache blocks suitable for the project in each device, connecting the small cache blocks to form a ring buffer, and storing the deployment packet from the head of the ring buffer and taking the deployment packet out from the tail of the ring buffer. In particular, the access of the deployment package mainly adopts a FIFO mode.
Specifically, FIFO, an abbreviation of english First In First Out, is also RAM In nature, which is a First In First Out data buffer, and is different from a common memory: there is no external read-write address line, so it is simple to use, only can write data in sequence, read data out in sequence, its data address is completed by adding 1 automatically by internal read-write pointer.
Specifically, the size of the deployment packet sub-package does not exceed the size of a single small cache block data field.
Specifically, the sum of the sizes of a plurality of small cache blocks forming the ring buffer is nk, and n is less than 10.
The invention also provides an OTA installation package deployment system based on the Ethernet, which comprises the following components:
the inspection module is used for inspecting the deployment condition by the upper computer;
the first sending module is used for sending the deployment packet sub-package to the lower computer by the upper computer;
the receiving module is used for receiving the deployment packet subpackages by the lower computer;
the storing module is used for placing the deployment packet sub-package into the corresponding small cache block from the head of the annular buffer zone by the lower computer;
an update module: the lower computer is used for updating the data header information of the small cache block;
taking out the module: the lower computer is used for taking out the small cache block from the tail part of the ring buffer area;
checking the storage module: the lower computer checks and stores the deployment packet sub-packets according to the header information of the small cache blocks;
a backfill module: the lower computer is used for backfilling the information related to response in the data header in the small cache block;
the first query module is used for starting a response mechanism by the lower computer and querying whether the annular buffer area needs to process a response or not;
the acquisition module is used for acquiring response information of the small cache block needing to be responded by the lower computer;
the second sending module is used for sending a response message to the upper computer by the lower computer;
the second query module is used for the upper computer to query the response message;
and the confirmation module is used for confirming the response message by the upper computer.
The invention also provides a method for upgrading the vehicle controller, which comprises the OTA installation package deployment method based on the Ethernet.
Claims (12)
1. An OTA installation package deployment method based on Ethernet is characterized by comprising the following steps:
s01: the upper computer checks the deployment condition, and executes the next step when the condition is met;
s02: the upper computer sends the deployment packet to the lower computer;
s03: the lower computer receives the deployment package sub-package;
s04: the lower computer puts the deployment packet into a corresponding small cache block from the head of an annular buffer zone, and the annular buffer zone is formed by connecting a plurality of small cache blocks into an annular shape;
s05: the lower computer updates the data header information of the small cache block;
s06: the lower computer takes out the small cache block from the tail part of the annular buffer area;
s07: the lower computer checks and stores the deployment packet sub-packets according to the header information of the small cache blocks;
s08: the lower computer backfills information related to response in a data header in the small cache block;
s09: the lower computer starts a response mechanism and inquires whether the ring buffer area needs to process response or not;
s10: the lower computer acquires response information of the small cache block needing to be responded;
s11: the lower computer sends a response message to the upper computer;
s12: the upper computer inquires and confirms the response message;
s13: and circulating the steps until the transmission of the whole deployment package is completed.
2. The Ethernet-based OTA installation package deployment method of claim 1,
in S04, after receiving the first deployment packet sub-package of the upper computer, the lower computer puts the deployment packet sub-package into the first small cache block, and adds the first small cache block to the location where the deployment packet sub-package of the ring buffer is stored, where the storage location of the deployment packet sub-package still points to the header, and the location where the deployment packet sub-package is taken out points to the first small cache block.
3. The Ethernet-based OTA installation package deployment method of claim 1,
in S05, after the lower computer obtains the first deployment packet sub-package, the length and number of the small cache block in the small cache block are updated according to the sequence of the received deployment packet sub-packages and the size of the deployment packet sub-packages.
4. The Ethernet-based OTA installation package deployment method of claim 1,
in S06, the ring buffer has three small cache blocks, the deployed packet taking position points to the first small cache block, the first small cache block is taken when the deployed packet is taken out from the ring buffer, the deployed packet taking position points to the second small cache block, and the second small cache block is taken out until all the deployed packet is taken out.
5. The Ethernet-based OTA installation package deployment method of claim 1,
in the S04, the size of the small cache block is smaller than a maximum value of a Maximum Transmission Unit (MTU) of the lower computer.
6. The Ethernet-based OTA installation package deployment method of claim 1,
in S04, the small cache block includes a data header, a data field, and a data trailer;
the data head comprises a head mark, a data field length, a data block number, a data block response block number, a link point, a data block response state, a data field check code and a response level.
7. The Ethernet-based OTA installation package deployment method of claim 1,
the size of the deployment packet sub-package does not exceed the size of a single small cache block data field.
8. The Ethernet-based OTA installation package deployment method of claim 1,
in S04, the sum of the sizes of the small buffer blocks constituting the ring buffer is nk, and n is smaller than 10.
9. An OTA installation package deployment system based on Ethernet, comprising:
the inspection module is used for inspecting the deployment condition by the upper computer;
the first sending module is used for sending the deployment packet sub-package to the lower computer by the upper computer;
the receiving module is used for receiving the deployment package sub-package by the lower computer;
the storing module is used for the lower computer to put the deployment packet sub-package into the corresponding small cache block from the head of the annular buffer area;
an update module: the lower computer is used for updating the data header information of the small cache block;
taking out the module: the lower computer is used for taking out the small cache block from the tail part of the ring buffer area;
checking the storage module: the lower computer checks and stores the deployment packet sub-packets according to the header information of the small cache blocks;
a backfill module: the lower computer is used for backfilling the information related to response in the data header in the small cache block;
the first query module is used for the lower computer to start a response mechanism and query whether the ring buffer needs to process a response or not;
the acquisition module is used for acquiring response information of the small cache blocks needing to be responded by the lower computer;
the second sending module is used for sending a response message to the upper computer by the lower computer;
the second query module is used for the upper computer to query the response message;
and the confirmation module is used for confirming the response message by the upper computer.
10. The Ethernet-based OTA installation package deployment system of claim 9,
the size of the small cache block is smaller than the maximum value of the Maximum Transmission Unit (MTU) of the lower computer;
the small cache block comprises a data head, a data field and a data tail;
the data head comprises a head mark, a data field length, a data block number, a data block response block number, a link point, a data block response state, a data field check code and a response level;
the size of the deployment packet sub-package does not exceed the size of a single small cache block data field.
11. The Ethernet-based OTA installation package deployment system of claim 9,
a plurality of small buffer blocks are connected to form the ring buffer area;
the sum of the sizes of a plurality of small cache blocks forming the annular buffer area is nk, and n is less than 10.
12. A method of upgrading a vehicle controller comprising the ethernet-based OTA installation package deployment method of any of claims 1 to 8.
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