CN112148658A - Plug-and-play SpaceWrie communication method based on xTEDS - Google Patents
Plug-and-play SpaceWrie communication method based on xTEDS Download PDFInfo
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- CN112148658A CN112148658A CN202010889210.6A CN202010889210A CN112148658A CN 112148658 A CN112148658 A CN 112148658A CN 202010889210 A CN202010889210 A CN 202010889210A CN 112148658 A CN112148658 A CN 112148658A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4004—Coupling between buses
- G06F13/4022—Coupling between buses using switching circuits, e.g. switching matrix, connection or expansion network
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/20—Handling requests for interconnection or transfer for access to input/output bus
- G06F13/24—Handling requests for interconnection or transfer for access to input/output bus using interrupt
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
- G06F13/4081—Live connection to bus, e.g. hot-plugging
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
Abstract
A plug-and-play SpaceWrie communication method based on xTEDS is characterized in that firstly, a device terminal to be accessed is numbered, and one device terminal is selected as a device group leader; recording attribute information of each equipment terminal by using a self-description spreadsheet (xTEDS) and storing the attribute information in an equipment group leader; hanging all equipment terminals on a data bus of the ASIM; when the ASIM receives a device periodic polling discovery command of the spaceborne computer, the ASIM sends a device registration interrupt signal to a device group leader, the device group leader transmits the xTEDS to the ASIM through serial communication, and the ASIM is sent to the spaceborne computer through a SpaceWire bus via a router; and the satellite-borne computer analyzes the xTEDS, identifies the accessed equipment terminals and performs distributed access on each equipment terminal. Compared with the traditional SPA system network access protocol, the invention greatly reduces the required hardware resources and can quickly access a large number of equipment terminals; and meanwhile, the requirement on the equipment terminal is low, and the equipment terminal only needs to support data bus interaction and receive interrupt signals.
Description
Technical Field
The invention relates to a plug-and-play SpaceWrie communication method based on xTEDS, belonging to the field of plug-and-play communication.
Background
With continuous adjustment of military strategy and continuous progress of aerospace technology, the requirements for functional modularization and replacement of a spacecraft are increasingly strong, and in order to enable a functional module of the spacecraft to have a plug-and-play characteristic, an effective method is needed to complete self description of the plug-and-play module, so that the module can be rapidly identified and applied.
The united states Air Force Research Laboratory (AFRL), under 2004 research in modular plug and play technology, developed a set of standards named "space vehicle plug and play electronics" (SPA) to define a space vehicle architecture based on standard interfacing modular components or subsystems. And different SPA interface standards such as SPA-I, SPA-U, SPA-S, SPA-O and the like are provided according to the difference of the interface rate and the communication rate. AFRL has developed two generations of ASIMs (the application sensor interface module) for SPA interface conversion.
As shown in fig. 1, each device terminal may access an SPA system network through its own ASIM, but for high-speed communication protocols such as SpaceWire, the implementation of the communication protocol needs to consume a large hardware resource, and if the number of the device terminals is large, each device needs to have its own ASIM to access the SPA system network, so that the same number of large ASIMs are needed, so that the cost performance of the SPA system architecture is low, and for the SPA system network, each device terminal has its own address, so that the access to the device is complex, and the complexity of the protocol is increased.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, and the plug-and-play SpaceWrie communication method based on the xTEDS is provided.
The technical solution of the invention is as follows:
a plug and play SpaceWrie communication method based on xTEDS comprises the following steps:
(1) numbering equipment terminals to be accessed currently as an equipment terminal 0, an equipment terminal 1 and an … … equipment terminal m in sequence, wherein the equipment terminal 0 is used as an equipment group leader, the equipment terminals 1-m are equipment group members, and each equipment group member corresponds to an interface ID;
(2) recording attribute information of each equipment terminal by using a self-description spreadsheet xTEDS, and storing the self-description spreadsheet xTEDS in the equipment terminal 0;
(3) hanging all equipment group members on a data bus of the ASIM, carrying out data interaction between an equipment group leader and the ASIM through an interrupt signal and serial communication, and communicating the ASIM with the satellite-borne computer through a router based on a SpaceWrie bus;
(4) when the ASIM receives a device periodic polling discovery command of the spaceborne computer, the ASIM sends a device registration interrupt signal to the device group leader, the device group leader transmits a self-description electronic data form xTEDS to the ASIM through serial communication after receiving the device registration interrupt signal, and the ASIM sends the self-description electronic data form xTEDS to the spaceborne computer through a SpaceWire bus by a router;
(5) and the satellite borne computer analyzes the self-description electronic data sheet xTEDS, identifies the accessed equipment terminals, and then performs distributed access on each equipment terminal according to the interface ID of the equipment terminal.
In the step (2), recording attribute information of each Device terminal by using a self-description spreadsheet xTEDS, where the self-description spreadsheet xTEDS includes an Application form, a Device form, and an interface form, the interface form includes interface sub-forms of each Device terminal, the interface sub-form of the Device terminal 0 only includes a Command sub-form, the interface sub-form of the Device terminal i includes a Notification sub-form, a Command sub-form, and a Request sub-form of the Device interface i, and i is 1, 2, 3, … …, m;
the method for recording the attribute information of each equipment terminal by using the self-description spreadsheet xTEDS comprises the following steps:
(2.1) extracting the common attributes of the Application classes of the equipment terminals, storing the common attributes in an Application form of the xTEDS, extracting the common attributes of the equipment classes of the equipment terminals, and storing the common attributes in a Device form of the xTEDS;
(2.2) extracting instruction service information which can be simultaneously executed in each equipment terminal, and storing the instruction service information in a Command sub-form of the equipment terminal 0;
(2.3) storing the subscription service information of the equipment terminal i in a Notification submenu of the equipment interface i, storing the instruction service information of the equipment terminal i in a Command submenu of the equipment interface i, and storing the Request service information of the equipment terminal i in a Request submenu of the equipment interface i;
in the step (5), the method for the spaceborne computer to perform distributed access to each equipment terminal according to the equipment terminal ID is as follows:
the on-board computer sends a distributed access command to the ASIM, the ASIM analyzes the command to obtain an interface ID corresponding to the command and message content with an attribute ID, enables a device terminal corresponding to the interface ID, then sends the message content to the device terminal corresponding to the interface ID, and the device terminal responds to execute a corresponding command according to the attribute ID after receiving the information.
When all the accessed equipment terminals need to execute a certain instruction at the same time, the on-board computer accesses all the equipment terminals at the same time in the following mode;
the on-board computer sends a command with interface ID of '000' to the ASIM, and after receiving the command information, the ASIM enables all the equipment group members at the same time and sends the command information to all the equipment group members.
After receiving the command with the interface ID of "000", each device terminal except the device terminal 0 performs the conformity judgment on the interface ID, and if the interface ID is determined to be "000", executes the corresponding command.
The format of the command sent by the on-board computer to the ASIM is as follows:
| header information | Interface ID | Attribute ID | Message data |
。
Compared with the prior art, the invention has the advantages that:
(1) the invention skillfully utilizes xTEDS to intensively describe the attribute information of all similar devices in the device group leader, completes the centralized registration, completes the data transmission from the device terminal 1 to the device terminal m in the form of a data bus, and designs a communication protocol to complete the distributed service of each device terminal.
(2) The invention skillfully utilizes the equipment group leader, so that the satellite-borne computer can simultaneously send instructions to the equipment terminals 1-m in the equipment group.
(3) Compared with the traditional SPA system network access protocol, the invention greatly reduces the required hardware resources and can quickly access a large number of equipment terminals; and meanwhile, the requirement on the equipment terminal is low, and the equipment terminal only needs to support data bus interaction and receive interrupt signals.
Drawings
FIG. 1 is a diagram of a conventional SPA system architecture;
FIG. 2 is a schematic diagram of the SPA system architecture of the present invention;
FIG. 3 is a process for practicing the present invention;
FIG. 4 is a diagram of the structure of the xTEDS;
fig. 5 shows the connection relationship between the ASIM and the device terminal group.
Detailed Description
The invention provides a plug-and-play SpaceWrie communication method based on xTEDS, wherein the SPA system network architecture is shown in figure 2. Mainly comprises 4 parts: the system comprises an onboard computer, a router, ASIM and a device terminal group consisting of a device terminal 0 to a device terminal m, wherein the device terminal 0 is a device group leader, and the device terminals 1 to m are device group members and have the capability of storing xTEDS. Each device terminal corresponds to an interface ID, the interface ID of the device terminal 0 is "000", the interface ID of the device terminal 1 is "001", and so on.
The invention has the following implementation steps:
the first step, recording the attribute information of each equipment terminal in an ASCII code form by using a self-description electronic data form xTEDS, and storing the self-description electronic data form xTEDS in an equipment terminal 0; the xTEDS format is shown in fig. 4.
Recording attribute information of each Device terminal by using a self-description spreadsheet xTEDS, as shown in fig. 4, the self-description spreadsheet xTEDS includes an Application (Application) form, a Device (Device) form, and an Interface (Interface) form, the Interface form includes Interface sub-forms of each Device terminal, the Interface sub-form of the Device terminal 0 includes only a Command sub-form, and the Interface sub-form of the Device terminal i includes a Notification (subscription) sub-form, a Command sub-form, and a Request sub-form of the Device Interface i, i is 1, 2, 3, … …, m;
the method for recording the attribute information of each equipment terminal by using the self-description spreadsheet xTEDS comprises the following steps:
(2.1) extracting the common attributes of the Application classes of the equipment terminals, storing the common attributes in an Application form of the xTEDS, extracting the common attributes of the equipment classes of the equipment terminals, and storing the common attributes in a Device form of the xTEDS;
(2.2) extracting instruction service information which can be simultaneously executed in each equipment terminal, and storing the instruction service information in a Command sub-form of the equipment terminal 0;
(2.3) storing the subscription service information of the equipment terminal i in a Notification sub-form of the equipment interface i, wherein the ID is '1 xx', storing the instruction service information of the equipment terminal i in a Command sub-form of the equipment interface i, the ID is 2xx, storing the Request service information of the equipment terminal i in a Request sub-form of the equipment interface i, and the ID is 3 xx;
and secondly, accessing the equipment, hanging all equipment group members on a data bus of the ASIM, and communicating the ASIM with the spaceborne computer through the router based on the SpaceWrie bus.
And thirdly, when the ASIM receives a device periodic polling discovery command of the satellite borne computer, the ASIM sends a device registration interrupt signal to the device group leader, the device group leader transmits the self-description electronic data form xTEDS to the ASIM through serial communication after receiving the device registration interrupt signal, and the ASIM is sent to the satellite borne computer through a SpaceWire bus and a router.
And fourthly, the satellite borne computer analyzes the self-description electronic data sheet xTEDS, identifies the accessed equipment terminals, and then the satellite borne computer performs distributed access on each equipment terminal according to the equipment terminal ID. After the on-board computer analyzes the data, the on-board computer can independently access the equipment 1 through the command with the interface ID of 001, independently access the equipment 2 through the command with the interface ID of 002, and the like, so that the purpose of performing distributed service on each equipment terminal is achieved.
The on-board computer sends a distributed access command to the ASIM, the ASIM analyzes the command to obtain an interface ID and message content corresponding to the command, wherein the message content comprises an attribute ID and message data, the equipment terminal corresponding to the interface ID is enabled, then the message content is sent to the equipment terminal corresponding to the interface ID, and after the equipment terminal receives the information, the equipment terminal can judge that the information is the second command of subscription service, instruction service or request service according to the attribute ID and respond to the command.
When all the accessed equipment terminals need to execute a certain instruction at the same time, the on-board computer accesses all the equipment terminals at the same time in the following mode;
the on-board computer sends an access command with interface ID of '000' to the ASIM, after receiving the access command information, the ASIM enables all the equipment group members at the same time, and sends the command information containing the attribute ID to all the equipment group members, after receiving the information, all the equipment group members can judge that the information is the fourth command of the command service according to the attribute ID, and execute the command.
Specifically, the device terminal access command is a subscription, an instruction or a request.
When the subscription command is a subscription command of a single device terminal, the spaceborne computer can send the subscription command with the interface ID information to the ASIM through SpaceWrie communication, and the ASIM accesses the device terminal corresponding to the interface ID through the data bus shown in fig. 5 to subscribe data of the device terminal.
When the command is a command of a single equipment terminal, the spaceborne computer can send the command with the interface ID information to the ASIM through SpaceWrie communication, and the ASIM accesses the equipment terminal corresponding to the interface ID through a data bus to complete the command sending of the equipment terminal.
When the request command is a request command of a single equipment terminal, the spaceborne computer can send the request command with the interface ID information to the ASIM through SpaceWrie communication, and the ASIM accesses the equipment terminal corresponding to the interface ID through a data bus to complete the data request of the equipment terminal.
When the command is the command of the equipment group, the spaceborne computer can send the command with the interface ID of '000' to the ASIM through SpaceWrie communication, and the ASIM simultaneously sends the command to the equipment 1-m through a data bus to complete the synchronous command sending of the equipment 1-m.
FIG. 3 illustrates an embodiment of the present invention.
Example (b):
taking the case that the device terminal group only includes the device terminal 0, the device terminal 1, and the device terminal 2, and the device terminal 0 is the group length, xTEDS in the device terminal 0 is as follows:
after the on-board computer completes the analysis, the information of the device terminal group is obtained as shown in table 1.
TABLE 1 device terminal group information
The on-board computer may periodically (1s) read "sacdcdc 0Temperature _ Reading 1", "OnOffStatus _ Reading 1" of the device terminal 1 or "sacdcdc 0Temperature _ Reading 2" and "OnOffStatus _ Reading 2" of the device terminal 2 from the accessed device terminal group to obtain the telemetry information of the device terminal 1 or the device terminal 2 and obtain the information of the type and coefficient thereof, or may send a command "0 xEB90C0C 0", "0 xEB90C1C 1" with an interface ID of 0 or a command "0 xEB90C0C 0" and "0 xEB90C1C 1" with an interface ID of 2 to change the state of the device terminal 1 or the device terminal 2. The commands "0 xEB90C0C 0", "0 xEB90C1C 1" with the interface ID 0 may also be sent to the ASIM to change the states of the device terminal 1 and the device terminal 2 at the same time.
After the spaceborne computer sends the equipment terminal access command to the ASIM, the ASIM accesses the equipment terminal 1(DPCUInterface1) and the equipment terminal 2(DPCUInterface2) respectively through the interface ID, or sends an instruction to the equipment 1 and the equipment terminal 2 simultaneously, that is, embeds the interface ID in the message command. The device terminal access command and the legacy device terminal access command are shown in tables 2 and 3. After the interface ID is analyzed from the message by the ASIM, the message data with the attribute ID is sent to the corresponding equipment, the command format is shown in table 4, and after the corresponding equipment receives the command, the corresponding equipment judges which message to respond to the execution instruction, the subscription or the request according to the attribute ID.
Table 2 legacy device terminal access command format
| Header information | Message data |
TABLE 3 Command Format for Access to ASIM by the on-board computer of the present invention
| Header information | Interface ID | Attribute ID | Message data |
Table 3 command format of ASIM access device of the present invention
| Attribute ID | Message data |
When the ASIM receives the message command with the interface ID of 0, it accesses the address spaces 0000H to 1FFFH, and at this time, the address signal a15a14a13 is 000B, and these three address lines are decoded, and Y0 is valid, and the CS of the device terminal 1 and the device terminal 2 is enabled, so that the ASIM can send commands to the device terminals 1 and 2 at the same time. When the ASIM receives the information command with the interface ID of 1, the access address space is 2000H to 3FFFH, at this time, the address signal a15a14a13 is 001B, and Y1 is valid, the CS of the device terminal 1 is enabled to perform data interaction with the device terminal 1, and when the ASIM receives the information command with the interface ID of 2, the CS performs data interaction with the device terminal 2 with the address space of 4000H to 5FFFH, and so on.
The invention can quickly complete the equipment registration of a large number of equipment by the equipment group leader in the equipment group, thereby saving the hardware resource of the communication interface and the registration time. The distributed access to the equipment group members can be achieved through different interface IDs, the use is convenient and flexible, and the instruction information can be sent to the equipment group members at the same time, so that the purpose of quick control is achieved.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (6)
1. A plug-and-play SpaceWrie communication method based on xTEDS is characterized by comprising the following steps:
(1) numbering equipment terminals to be accessed currently as an equipment terminal 0, an equipment terminal 1 and an … … equipment terminal m in sequence, wherein the equipment terminal 0 is used as an equipment group leader, the equipment terminals 1-m are equipment group members, and each equipment group member corresponds to an interface ID;
(2) recording attribute information of each equipment terminal by using a self-description spreadsheet xTEDS, and storing the self-description spreadsheet xTEDS in the equipment terminal 0;
(3) hanging all equipment group members on a data bus of the ASIM, carrying out data interaction between an equipment group leader and the ASIM through an interrupt signal and serial communication, and communicating the ASIM with the satellite-borne computer through a router based on a SpaceWrie bus;
(4) when the ASIM receives a device periodic polling discovery command of the spaceborne computer, the ASIM sends a device registration interrupt signal to the device group leader, the device group leader transmits a self-description electronic data form xTEDS to the ASIM through serial communication after receiving the device registration interrupt signal, and the ASIM sends the self-description electronic data form xTEDS to the spaceborne computer through a SpaceWire bus by a router;
(5) and the satellite borne computer analyzes the self-description electronic data sheet xTEDS, identifies the accessed equipment terminals, and then performs distributed access on each equipment terminal according to the interface ID of the equipment terminal.
2. The xTEDS-based plug-and-play SpaceWrie communication method according to claim 1, wherein: in the step (2), recording attribute information of each Device terminal by using a self-description spreadsheet xTEDS, where the self-description spreadsheet xTEDS includes an Application form, a Device form, and an interface form, the interface form includes interface sub-forms of each Device terminal, the interface sub-form of the Device terminal 0 only includes a Command sub-form, the interface sub-form of the Device terminal i includes a Notification sub-form, a Command sub-form, and a Request sub-form of the Device interface i, and i is 1, 2, 3, … …, m;
the method for recording the attribute information of each equipment terminal by using the self-description spreadsheet xTEDS comprises the following steps:
(2.1) extracting the common attributes of the Application classes of the equipment terminals, storing the common attributes in an Application form of the xTEDS, extracting the common attributes of the equipment classes of the equipment terminals, and storing the common attributes in a Device form of the xTEDS;
(2.2) extracting instruction service information which can be simultaneously executed in each equipment terminal, and storing the instruction service information in a Command sub-form of the equipment terminal 0;
and (2.3) storing the subscription service information of the equipment terminal i in a Notification submenu of the equipment interface i, storing the instruction service information of the equipment terminal i in a Command submenu of the equipment interface i, and storing the Request service information of the equipment terminal i in a Request submenu of the equipment interface i.
3. The xTEDS-based plug-and-play SpaceWrie communication method according to claim 1, wherein: in the step (5), the method for the spaceborne computer to perform distributed access to each equipment terminal according to the equipment terminal ID is as follows:
the on-board computer sends a distributed access command to the ASIM, the ASIM analyzes the command to obtain an interface ID corresponding to the command and message content with an attribute ID, enables a device terminal corresponding to the interface ID, then sends the message content to the device terminal corresponding to the interface ID, and the device terminal responds to execute a corresponding command according to the attribute ID after receiving the information.
4. The xTEDS-based plug-and-play SpaceWrie communication method according to claim 1, wherein: when all the accessed equipment terminals need to execute a certain instruction at the same time, the on-board computer accesses all the equipment terminals at the same time in the following mode;
the on-board computer sends a command with interface ID of '000' to the ASIM, and after receiving the command information, the ASIM enables all the equipment group members at the same time and sends the command information to all the equipment group members.
5. The xTEDS-based plug-and-play SpaceWrie communication method according to claim 4, wherein: after receiving the command with the interface ID of "000", each device terminal except the device terminal 0 performs the conformity judgment on the interface ID, and if the interface ID is determined to be "000", executes the corresponding command.
6. The plug-and-play SpaceWrie communication method based on xTEDS, as claimed in claim 3 or 4, wherein: the format of the command sent by the on-board computer to the ASIM is as follows:
。
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