CN116527714A - Vehicle-mounted communication system and vehicle based on PCIe - Google Patents

Abstract

The present application generally relates to the technical field of communication, and more specifically relates to a PCIe-based vehicle communication system and a vehicle. A PCIe-based vehicular communication system according to one aspect of the present application includes: a plurality of system-on-chip SOCs, the plurality of system-on-chip SOCs are divided into root complexes and a plurality of endpoint devices; A device is coupled to the root complex and the plurality of endpoint devices for performing communication operations between the root complex and the plurality of endpoint devices and between the plurality of endpoint devices.

Description

Vehicle communication system and vehicle based on PCIe

technical field

The present application generally relates to the technical field of communication, and more specifically relates to a PCIe (Peripheral Component Interconnect express)-based vehicle communication system and a vehicle.

Background technique

With the rapid development of the "new four modernizations" (electrification, intelligence, networking, and sharing) of automobiles, especially intelligence, build an intelligent central computer computing platform with loose coupling, high cohesion, and scalable computing power It has become the main trend of future automobile development. The intelligent central computer computing power platform aims to realize computing power sharing, dynamic load balancing, computing power scalability, homogeneous cascading, etc., and realizes the transformation from discrete component development to customer-oriented software services, combined with computing power scalability Software and hardware architecture and load balancing technology support the implementation of the "software-defined car" strategy.

How to communicate data efficiently and effectively between multiple system-on-chip SOCs (System on Chips) on the intelligent central computer computing power platform has become the main problem that restricts the intelligent central computer computing power platform from realizing the core goals of computing power sharing and dynamic balance. technical bottleneck. At present, the communication methods between system-on-chip SOCs mainly include SPI (Serial Peripheral Interface) and vehicle Ethernet communication. However, due to the limited transmission distance and communication rate, SPI cannot meet the high-speed transmission requirements of the intelligent central computer computing power platform for big data. Although the vehicle-mounted Ethernet can reach a gigabit communication rate, with the development of autonomous driving, higher computing power and communication rate requirements are put forward for the intelligent central computer computing power platform, so that the already fully loaded Ethernet is also It is difficult to solve the problem of higher rate data communication among multiple system-on-chip SOCs.

Therefore, how to realize efficient and fast data communication between multiple system-on-chip SOCs on the intelligent central computer computing power platform has become an urgent technical problem to be solved.

Contents of the invention

In order to solve or at least alleviate one or more of the above problems, the following technical solutions are provided.

According to the first aspect of the present application, a PCIe-based vehicular communication system is provided, the vehicular communication system includes: a plurality of system-on-chip SOCs, and the plurality of system-on-chip SOCs are divided into a root complex and a plurality of endpoints equipment; and a PCIe switching device coupled to the root complex and the plurality of endpoint devices for use between the root complex and the plurality of endpoint devices and between the plurality of endpoint devices Perform communication operations between endpoint devices.

According to the PCIe-based vehicle communication system according to an embodiment of the present application, the communication operation includes a read operation and a write operation.

According to an embodiment of the present application or the described PCIe-based vehicular communication system according to any one of the above embodiments, wherein the root complex is configured to: obtain the states of the multiple endpoint devices by enumerating the PCIe tree; and based on the The states of the multiple endpoint devices realize the mapping between the respective CPU domains and the PCIe domains on the root complex and the multiple endpoint devices respectively, so as to realize the function of the CPU to operate the PCIe domain address.

According to an embodiment of the present application or the described PCIe-based vehicular communication system according to any of the above embodiments, wherein the PCIe switching device is configured to execute the root complex to one of the plurality of endpoint devices in the following manner A read operation for an endpoint device: receiving a read operation request from the root complex and sending the read operation request to an endpoint device of the plurality of endpoint devices, such that the endpoint device responds to the read operation request reading corresponding data from user space and writing the data to the PCIe domain and triggering a write complete interrupt; and receiving the write complete interrupt from the endpoint device and sending the write complete interrupt to the root complex , causing the root complex to transfer the data in the PCIe domain back to user space for saving in response to the write completion interrupt.

According to an embodiment of the present application or the described PCIe-based vehicular communication system according to any of the above embodiments, wherein the PCIe switching device is configured to execute the root complex to one of the plurality of endpoint devices in the following manner a write operation for an endpoint device: receiving a write operation request from the root complex and sending the write operation request to an endpoint device of the plurality of endpoint devices, such that the endpoint device responds to the write operation request Obtain the corresponding data of the PCIe domain to trigger a write completion interrupt, and transfer the data back to the user space for saving.

According to the described PCIe-based vehicular communication system according to an embodiment of the present application or any one of the above embodiments, wherein the PCIe switching device is configured to execute one of the multiple end-point devices to the root in the following manner write operation of a complex: receiving a write operation request and a write completion interrupt from one of the plurality of endpoint devices and sending the write operation request and a write completion interrupt to the root complex such that the root complex The body obtains corresponding data of the PCIe domain in response to the write completion interrupt and transfers the data back to the user space for saving.

According to the described PCIe-based vehicular communication system according to an embodiment of the present application or any one of the above embodiments, wherein the PCIe switching device is configured to execute one of the multiple end-point devices to the root in the following manner read operation of a complex: receiving a read operation request and a read interrupt from one of the plurality of endpoint devices and sending the read operation request and read interrupt to the root complex, causing the root complex to respond Obtain corresponding data from user space and write the data into the PCIe domain due to the read interruption, and set the root complex data processing completion flag; and receive the root complex data processing completion flag from the root complex and sending the root complex data processing completion identifier to one of the multiple endpoint devices, so that the endpoint device responds to the root complex data processing completion identifier and sends all The above data is transferred back to the user space for saving.

According to an embodiment of the present application or the described PCIe-based vehicular communication system according to any one of the above embodiments, wherein the PCIe switching device is configured to perform write operations between the multiple end-point devices in the following manner: from the an endpoint device of the plurality of endpoint devices receives a write operation request and a write completion interrupt and sends the write operation request and the write completion interrupt to the root complex such that the root complex responds to the write completion interrupt obtaining corresponding data of the PCIe domain and passing the data back to user space; receiving a write operation request from the root complex and sending the write operation request to another endpoint device in the plurality of endpoint devices, such that The endpoint device obtains corresponding data of the PCIe domain in response to the write operation request, and returns the data to user space for storage.

According to an embodiment of the present application or the described PCIe-based vehicular communication system according to any of the above embodiments, wherein the PCIe switching device is configured to perform the read operation between the multiple end-point devices in the following manner: from the An endpoint device of the plurality of endpoint devices receives a read request and a read interrupt and sends the read request and read interrupt to the root complex, such that the root complex obtains the read interrupt in response to the read interrupt corresponding data of another endpoint device in the plurality of endpoint devices and writing the data into the PCIe domain of one endpoint device in the plurality of endpoint devices, and setting the root complex data processing completion flag; and from the the root complex receiving the root complex data processing completion indication and sending the root complex data processing completion indication to one of the plurality of endpoint devices such that the endpoint device responds to the root complex The data processing is completed and the data in the PCIe domain is returned to the user space for storage.

According to a second aspect of the present application, a vehicle is provided, the vehicle comprising the PCIe-based vehicle communication system according to the first aspect of the present application.

The PCIe-based in-vehicle communication system according to one or more embodiments of the present application can be based on PCIe communication, and multiple system-on-chip SOCs communicate through more efficient PCIe, which helps to solve or alleviate the problem of the central computer platform Ethernet in the car. The problem of high load rate is solved, so as to realize more efficient big data communication between multiple system-on-chip SOCs.

Description of drawings

The above and/or other aspects and advantages of the present application will become clearer and easier to understand through the following description of various aspects in conjunction with the accompanying drawings, in which the same or similar elements are represented by the same reference numerals. In said attached drawings:

FIG. 1 shows a block diagram of a PCIe-based vehicular communication system according to one or more embodiments of the present application.

FIG. 2 shows a block diagram of a PCIe-based vehicular communication system according to one or more embodiments of the present application.

FIG. 3 shows a block diagram of a PCIe-based vehicular communication system according to one or more embodiments of the present application.

FIG. 4 shows a block diagram of a PCIe-based vehicular communication system according to one or more embodiments of the present application.

FIG. 5 shows a block diagram of a PCIe-based vehicular communication system according to one or more embodiments of the present application.

FIG. 6 shows a block diagram of a PCIe-based vehicular communication system according to one or more embodiments of the present application.

FIG. 7 shows a block diagram of a PCIe-based vehicular communication system according to one or more embodiments of the present application.

Detailed ways

Exemplary embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings. It should be noted that the following description is for the purpose of illustration and illustration, and therefore should not be considered as limiting the application. Without departing from the principles of the present application, those skilled in the art may make electrical, mechanical, logical and structural changes to these embodiments according to actual needs, without departing from the scope of the present application. In addition, those skilled in the art can understand that, for any specific application scenario or actual needs, one or more features of the different embodiments described below can be combined.

Words such as "comprising" and "comprising" mean that in addition to the units and steps that are directly and explicitly stated in the specification, the technical solution of the present application does not exclude other units and steps that are not directly or explicitly stated. situation. Words such as "first" and "second" do not denote the order of elements in terms of time, space, size, etc. but are merely used to distinguish elements.

In the following description, numerous specific details are set forth, such as examples of specific components, circuits, and processes, in order to provide a thorough understanding of the present application. The term "coupled" as used herein means connected directly to or connected through one or more intermediate components or circuits. Furthermore, in the following description, and for purposes of explanation, specific nomenclature is set forth in order to provide a thorough understanding of the various aspects of the application. It will be apparent, however, to one skilled in the art that example implementations may be practiced without these specific details. In other instances, well-known circuits and devices are shown in block diagram form in order to avoid obscuring the application.

FIG. 1 shows a block diagram of a PCIe-based vehicular communication system according to one or more embodiments of the present application.

As shown in Figure 1, the vehicle communication system 100 based on PCIe includes a plurality of system-on-chip SOC-1110, SOC-2110, SOC-3110, SOC-4110 and PCIe switching device 120, wherein a plurality of system-on-chip SOC-1110 , SOC-2110, SOC-3110, and SOC-4110 can be divided into root complexes (for example, the system-on-chip SOC-1110 shown in Figure 1, which can also be called RC (RootComplex)) and multiple endpoint devices ( For example, the system-on-chip SOC-2110, SOC-3110, and SOC-4110 shown in FIG. 1 may also be called EP (EndPoint)). The PCIe switching device 120 is coupled to the root complex SOC-1110 and a plurality of end point devices SOC-2110, SOC-3110, SOC-4110, for connecting the root complex SOC-1110 with a plurality of end point devices SOC-2110, SOC- 3110, SOC-4110 and between multiple endpoint devices SOC-2110, SOC-3110, SOC-4110 to perform communication operations. Optionally, the communication operation may include a read operation and a write operation.

Optionally, strategies such as interrupt triggering, polling, and system calls can be used to realize the data interaction function between the upper layer application in the user state and the driver in the kernel state, so as to realize the interaction between the root complex SOC-1110 and multiple endpoint devices SOC-2110, SOC High-speed data communication between -3110, SOC-4110 and multiple endpoint devices SOC-2110, SOC-3110, SOC-4110 through PCIe.

Optionally, the communication strategy between the root complex and multiple endpoint devices and the communication strategy between multiple endpoint devices may include: (1) Multiple endpoint devices implement request sending, data processing and polling in user space function, calling system functions to interact with the kernel state; (2) multiple endpoint device-side kernel states, realizing the response of read and write commands, copying data and triggering interrupts, and notifying the root complex to process data; (3) the root After the kernel state interrupt polling module at the complex end detects that the interrupt is set, it processes the data and interacts with the user state of the root complex through system calls; (4) The user state of the root complex also implements request sending and data processing And polling function, to realize the function of actively initiating requests and responding to data requests of multiple endpoint devices.

Optionally, the root complex SOC-1110 can be configured to obtain the status of multiple endpoint devices SOC-2110, SOC-3110, SOC-4110 by enumerating the PCIe tree, and based on the status of multiple endpoint devices SOC-2110, SOC-3110 , the state of SOC-4110 realizes the mapping of respective CPU domains and PCIe domains on the root complex SOC-1110 and the multiple endpoint devices SOC-2110, SOC-3110, SOC-4110 respectively, to realize CPU operation PCIe domain address function.

The PCIe-based in-vehicle communication system according to one or more embodiments of the present application can be based on PCIe communication, and multiple system-on-chip SOCs communicate through more efficient PCIe, which helps to solve or alleviate the problem of the central computer platform Ethernet in the car. The problem of high load rate is solved, so as to realize more efficient big data communication between multiple system-on-chip SOCs.

The communication strategy between the root complex and multiple endpoint devices and the communication strategy between multiple endpoint devices according to one or more embodiments of the present application will be described in detail below with reference to FIGS. 2-7 .

FIG. 2 shows a block diagram of a PCIe-based vehicular communication system according to one or more embodiments of the present application.

As shown in FIG. 2 , the PCIe-based vehicular communication system 200 includes a system-on-chip SOC-1210, a SOC-2210, and a PCIe switching device 220, wherein the system-on-chip SOC-1210 is implemented as a root complex and the system-on-chip SOC-2210 Implemented as an endpoint device, the PCIe switch device 220 is coupled to the root complex SOC-1 210 and the endpoint device SOC-2 210 for realizing the read operation of the root complex SOC-1 210 on the endpoint device SOC-2 210 .

Optionally, the PCIe switching device 220 may be configured to receive a read operation request from the root complex SOC-1 210 and send the read operation request to the end point device SOC-2 210, so that the end point device SOC-2 210 responds to the read operation Read the corresponding data from the user space and write the data into the PCIe domain according to the operation request, and trigger a write completion interrupt; and receive the write completion interrupt from the endpoint device SOC-2210 and send the write completion interrupt to the root complex SOC-1210, so that the root complex SOC-1210 responds to the write completion interrupt and transfers the data in the PCIe domain back to the user space for saving.

As shown in Figure 2, firstly, the read app module of the user space of the root complex SOC-1210 initiates a read operation request, and then calls the read processing function of the kernel through the system, after mapping the PCIe domain and the CPU domain, set the corresponding Registers (for example, read base address, data size, etc.), send a read operation request to the endpoint device SOC-2210 via the PCIe switch device 220, and wait for the interrupt trigger that the endpoint device SOC-2210 writes to complete.

Next, after the write polling module of the endpoint device SOC-2210 receives the read operation request from the root complex SOC-1210, the write app module reads the corresponding data from the user space, and then writes the data to the PCIe domain through the system call, And trigger the write complete interrupt. After the root complex SOC-1210 receives the write completion interrupt from the endpoint device SOC-2210 via the PCIe switching device 220, it reads the data in the PCIe domain to the dma (directmemoryaccess), and sends it back to the user space through the system call, and through the user space Save data module to save data.

FIG. 3 shows a block diagram of a PCIe-based vehicular communication system according to one or more embodiments of the present application.

As shown in FIG. 3 , the PCIe-based vehicular communication system 300 includes a system-on-chip SOC-1310, a SOC-2310, and a PCIe switching device 320, wherein the system-on-chip SOC-1310 is implemented as a root complex and the system-on-chip SOC-2310 Implemented as an endpoint device, the PCIe switch device 320 is coupled to the root complex SOC-1 310 and the endpoint device SOC-2 310 for implementing the write operation of the root complex SOC-1310 to the endpoint device SOC-2 310 .

Optionally, the PCIe switching device 220 may be configured to receive a write operation request from the root complex SOC-1310 and send the write operation request to the end point device SOC-2310, so that the end point device SOC-2310 responds to the write operation The corresponding data of the PCIe domain is obtained by operating the request to trigger a write completion interrupt, and the data is returned to the user space for storage.

As shown in Figure 3, first, the write app module of the user space of the root complex SOC-1310 initiates a write operation request, and then calls the write processing function of the kernel through the system, after mapping the PCIe domain and the CPU domain, set the corresponding Registers (for example, read base address, data size, etc.), send a write operation request to the endpoint device SOC-2310 via the PCIe switch device 320, and wait for the interrupt trigger of the endpoint device SOC-2310 read completion.

Next, after receiving the write operation request from the root complex SOC-1310, the read polling module of the endpoint device SOC-2310 reads the corresponding data in the PCIe domain, triggers the write completion interrupt, and transmits the data to To the user space, the user space save data module to save the data.

FIG. 4 shows a block diagram of a PCIe-based vehicular communication system according to one or more embodiments of the present application.

As shown in FIG. 4 , the PCIe-based vehicular communication system 400 includes a system-on-chip SOC-1410, a SOC-2410, and a PCIe switching device 420, wherein the system-on-chip SOC-1410 is implemented as a root complex and the system-on-chip SOC-2410 Implemented as an endpoint device, the PCIe switch device 420 is coupled to the root complex SOC-1 410 and the endpoint device SOC-2 410 for implementing the write operation of the root complex SOC-1 410 by the endpoint device SOC-2 410 .

Optionally, the PCIe switching device 420 may be configured to receive a write operation request and a write completion interrupt from the endpoint device SOC-2410 and send the write operation request and the write completion interrupt to the root complex SOC-1410, so that the root complex The body SOC-1410 obtains the corresponding data of the PCIe domain in response to the write completion interrupt and transfers the data back to the user space for saving.

As shown in Figure 4, first, the write app module of the user space of the endpoint device SOC-2410 initiates a write operation request, and then uses the system call to the write processing interface of the kernel to map the CPU domain and the PCIe domain, and set the corresponding register (for example, the base address of the write, the data size, etc.), trigger the write completion interrupt.

Next, after the polling app module on the root complex SOC-1410 side receives the write completion interrupt from the endpoint device SOC-2410 via the PCIe switching device 420, the data is copied from the PCIe domain and transmitted to the user space, and the user space saves the data module to store data.

FIG. 5 shows a block diagram of a PCIe-based vehicular communication system according to one or more embodiments of the present application.

As shown in FIG. 5, a PCIe-based vehicle communication system 500 includes a system-on-chip SOC-1510, a SOC-2510, and a PCIe switching device 520, wherein the system-on-chip SOC-1510 is implemented as a root complex and the system-on-chip SOC-2510 Implemented as an end point device, the PCIe switch device 520 is coupled to the root complex SOC-1510 and the end point device SOC-2 510 for realizing the read operation of the root complex SOC-1510 by the end point device SOC-2510.

Optionally, the PCIe switching device 520 may be configured to receive a read operation request and a read interrupt from the endpoint device SOC-2510 and send the read operation request and the read interrupt to the root complex SOC-1510, so that the root complex SOC -1510 obtains corresponding data from user space in response to the read interrupt and writes the data into the PCIe domain, and sets the root complex data processing completion flag; and receives the root from the root complex SOC-1510 The complex data processing completes the identification and sends the root complex data processing completion identification to the endpoint device SOC-2510, so that the endpoint device SOC-2510 responds to the root complex data processing completion identification and sends the PCIe domain The data in is passed back to user space for saving.

As shown in Figure 5, firstly, the read app module of the user space of the endpoint device SOC-2510 initiates a read operation request, calls the read processing interface of the kernel through a system call, performs mapping between the CPU domain and the PCIe domain, and sets the corresponding register ( For example, read base address, data size, etc.), trigger a read interrupt, and wait for the root complex data processing completion flag.

Next, after the polling app module of the user space on the root complex SOC-1510 side receives the read interrupt from the endpoint device SOC-2510 via the PCIe switching device 520, it reads data from the user space and writes the data to the corresponding PCIe domain , and set the root complex data processing complete flag. After the endpoint device SOC-2510 receives the identification of the root complex data processing completion through the PCIe switching device 520, it extracts the data in the corresponding PCIe domain and transmits it to the user space, and the data saving module in the user space saves the data.

FIG. 6 shows a block diagram of a PCIe-based vehicular communication system according to one or more embodiments of the present application.

As shown in Figure 6, the PCIe-based vehicle communication system 600 includes a system-on-chip SOC-1610, SOC-2610, SOC-3610, and a PCIe switching device 620, wherein the system-on-chip SOC-1610 is implemented as a root complex and a system-level The chips SOC-2610 and SOC-3610 are implemented as endpoint devices, and the PCIe switching device 620 is coupled to the root complex SOC-1610 and the endpoint devices SOC-2610 and SOC-3610 to realize the connection between the endpoint devices SOC-2610 and SOC-3610. between write operations.

Optionally, the PCIe switching device 620 may be configured to receive a write operation request and a write completion interrupt from the endpoint device SOC-2610 and send the write operation request and the write completion interrupt to the root complex SOC-1610, so that the root complex The body SOC-1610 obtains the corresponding data of the PCIe domain in response to the write complete interrupt and transfers the data back to user space; receives a write operation request from the root complex SOC-1610 and sends the write operation request to the endpoint The device SOC-3610 enables the end point device SOC-3610 to obtain the corresponding data of the PCIe domain in response to the write operation request, and transfer the data back to the user space for storage.

FIG. 6 exemplarily shows a write operation from an endpoint device SOC-2 610 to an endpoint device SOC-3 610 . First, the write app module of the user space of the endpoint device SOC-2610 initiates a write operation request, sends data to the write processing interface of the kernel through a system call, and after mapping the CPU domain and the PCIe domain, sets the corresponding register (for example, the write base address, data size, etc.), triggering a write complete interrupt.

Next, after the root complex SOC-1610 receives the write completion interrupt via the PCIe switching device 620, it copies the data from the corresponding PCIe domain and transmits it to the user space, and the data forwarding module of the user space of the root complex SOC-1610 detects this data In order to send to the endpoint device SOC-3610, it is forwarded to the corresponding driver processing interface of the endpoint device SOC-3610. For subsequent write operations, please refer to the write operation process of the root complex SOC-1310 to the endpoint device SOC-2310. Let me repeat.

FIG. 7 shows a block diagram of a PCIe-based vehicular communication system according to one or more embodiments of the present application.

As shown in FIG. 7 , a PCIe-based vehicular communication system 700 includes a system-on-chip SOC-1710, SOC-2710, SOC-3710, and a PCIe switching device 720, wherein the system-on-chip SOC-1710 is implemented as a root complex and a system-level The chips SOC-2710 and SOC-3710 are implemented as endpoint devices, and the PCIe switching device 720 is coupled to the root complex SOC-1710 and the endpoint devices SOC-2710 and SOC-3710 to realize the connection between the endpoint devices SOC-2710 and SOC-3710. between read operations.

Optionally, the PCIe switching device 720 may be configured to receive a read operation request and a read interrupt from the endpoint device SOC-2710 and send the read operation request and the read interrupt to the root complex SOC-1710, so that the root complex SOC - 1710 obtain the corresponding data of the endpoint device SOC-3710 in response to the read interrupt and write the data into the PCIe domain of the endpoint device SOC-2710, and set the root complex data processing completion flag; and from the root complex SOC-1710 receives said root complex data processing completion indication and sends said root complex data processing completion indication to endpoint device SOC-2710, so that said endpoint device SOC-2710 responds to said root complex data processing completion identify and transfer the data in the PCIe domain back to the user space for storage.

FIG. 7 exemplarily shows the data read operation of the endpoint device SOC-2710 from the endpoint device SOC-3710. First, the read app module of the user space of the endpoint device SOC-2710 initiates a read operation request, through the system call, to the read processing interface of the kernel, after mapping the CPU domain and the PCIe domain, set the corresponding register (for example, the base address of the read , data size, etc.), trigger a read interrupt, and wait for the root complex data processing completion flag.

Next, after the polling app module on the root complex SOC-1710 side receives the read interrupt from the endpoint device SOC-2710 via the PCIe switch device 720, the user space detects that the read operation request is to read data from the endpoint device SOC-3710 The request is then called to the corresponding driver processing interface of the endpoint device SOC-3710. For subsequent read operations, reference may be made to the read operation process of the root complex SOC-1210 to the endpoint device SOC-2210, which will not be repeated here. After the root complex SOC-1710 reads the data of the endpoint device SOC-3710, it writes it into the PCIe domain corresponding to the endpoint device SOC-2710, and sets the root complex data processing completion flag. Finally, after the endpoint device SOC-2710 receives the root complex data processing completion flag via the PCIe switching device 720, it extracts the data in the corresponding PCIe domain and transmits it to the user space, and the data saving module in the user space saves the data.

According to one aspect of the present application, the PCIe-based in-vehicle communication system can use PCIe communication technology to realize high-speed data communication between multiple system-level chip SOCs on the automobile central computer platform, effectively solving the problem that traditional communication methods on the automobile central computer platform cannot meet the computing power SOC provides important technical support for the rapid development of automobile intelligence due to the high-speed communication requirements brought about by tasks such as computing power sharing, dynamic load balancing, computing power scalability, and homogeneous cascading. In addition, the communication between multiple system-level chip SOCs of the automobile central computer platform is realized through PCIe, which reduces the current high load rate of the vehicle-mounted Ethernet of the central computer platform, and effectively alleviates the communication between multiple system-level chip SOCs of the vehicle central computer platform. Net and SPI are highly dependent. At the same time, it makes full use of the Linux system driver development framework and system call interface functions, with less development and strong portability, and can transmit various data, such as images and video streams.

In addition, the present application may also be implemented as a vehicle including the PCIe-based in-vehicle communication system according to one aspect of the present application.

The embodiments and examples presented herein are provided in order to best explain the embodiments of the application and its particular application in accordance with, and thereby enable those skilled in the art to make and use the application. However, those skilled in the art will appreciate that the foregoing description and examples are provided for purposes of illustration and example only. The presented description is not intended to cover every aspect of the application or to limit the application to the precise form disclosed.

Claims (10)

1. a kind of vehicle-mounted communication system based on PCIe, it is characterized in that, described vehicle-mounted communication system comprises: a plurality of system-on-chip SOCs partitioned into a root complex and a plurality of endpoint devices; and a PCIe switching device coupled to the root complex and the plurality of end point devices for use between the root complex and the plurality of end point devices and between the plurality of end point devices Perform communication operations between them. 2. The in-vehicle communication system according to claim 1, wherein the communication operation includes a read operation and a write operation. 3. The vehicular communication system of claim 1, wherein the root complex is configured to: Obtaining the states of the plurality of endpoint devices by enumerating the PCIe tree; and Based on the states of the multiple endpoint devices, respectively implement the mapping between the CPU domain and the PCIe domain on the root complex and the multiple endpoint devices, so as to realize the function of the CPU operating the PCIe domain address. 4. The vehicular communication system according to claim 1, wherein the PCIe switching device is configured to perform a read operation of the root complex to one of the plurality of endpoint devices by: Receiving a read request from the root complex and sending the read request to one of the plurality of endpoint devices, such that the endpoint device reads the corresponding and writing the data to the PCIe domain and triggering a write complete interrupt; and receiving the write complete interrupt from the endpoint device and sending the write complete interrupt to the root complex, such that the root complex sends the data in the PCIe domain in response to the write complete interrupt Pass back to user space for saving. 5. The vehicular communication system according to claim 1, wherein the PCIe switching device is configured to perform the write operation of the root complex to one of the plurality of endpoint devices in the following manner: receiving a write operation request from the root complex and sending the write operation request to one of the plurality of end point devices, such that the end point device obtains corresponding data of the PCIe domain in response to the write operation request To trigger the write completion interrupt, and transfer the data back to the user space for saving. 6. The vehicular communication system according to claim 1, wherein the PCIe switching device is configured to perform a write operation of an endpoint device in the plurality of endpoint devices to the root complex in the following manner: receiving a write request and a write completion interrupt from one of the plurality of endpoint devices and sending the write request and a write completion interrupt to the root complex such that the root complex responds to the write The interrupt is completed to obtain the corresponding data of the PCIe domain and transfer the data back to the user space for saving. 7. The vehicular communication system according to claim 1, wherein the PCIe switching device is configured to perform a read operation of an endpoint device in the plurality of endpoint devices to the root complex in the following manner: receiving a read request and a read interrupt from one of the plurality of endpoint devices and sending the read request and the read interrupt to the root complex such that the root complex responds to the read interrupt Obtain corresponding data from the user space and write the data into the PCIe domain, and set the root complex data processing completion flag; and receiving the root complex data processing completion indication from the root complex and sending the root complex data processing completion indication to one of the plurality of endpoint devices such that the endpoint device responds to the The identification of root complex data processing is completed, and the data in the PCIe domain is returned to the user space for storage. 8. The vehicular communication system according to claim 1, wherein the PCIe switching device is configured to perform write operations between the plurality of endpoint devices in the following manner: receiving a write request and a write completion interrupt from one of the plurality of endpoint devices and sending the write request and a write completion interrupt to the root complex such that the root complex responds to the write Complete the interrupt to obtain the corresponding data of the PCIe domain and transfer the data back to the user space; receiving a write operation request from the root complex and sending the write operation request to another of the plurality of end point devices, such that the end point device obtains a corresponding PCIe domain in response to the write operation request data, and pass said data back to user space for saving. 9. The vehicular communication system according to claim 1, wherein the PCIe switching device is configured to perform a read operation between the plurality of endpoint devices in the following manner: receiving a read request and a read interrupt from one of the plurality of endpoint devices and sending the read request and the read interrupt to the root complex such that the root complex responds to the read interrupt Obtain corresponding data of another endpoint device in the plurality of endpoint devices and write the data into the PCIe domain of one endpoint device in the plurality of endpoint devices, and set the root complex data processing completion flag; and receiving the root complex data processing completion indication from the root complex and sending the root complex data processing completion indication to one of the plurality of endpoint devices such that the endpoint device responds to the The identification of root complex data processing is completed, and the data in the PCIe domain is returned to the user space for storage. 10. A vehicle, characterized in that the vehicle comprises: The vehicle communication system based on PCIe according to any one of claims 1-9.