CN109547310B - Modular bus data receiving method - Google Patents
Modular bus data receiving method Download PDFInfo
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- CN109547310B CN109547310B CN201811311324.1A CN201811311324A CN109547310B CN 109547310 B CN109547310 B CN 109547310B CN 201811311324 A CN201811311324 A CN 201811311324A CN 109547310 B CN109547310 B CN 109547310B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40267—Bus for use in transportation systems
- H04L2012/4028—Bus for use in transportation systems the transportation system being an aircraft
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Abstract
The invention belongs to the aviation bus data receiving and distributing technology, and relates to a convenient modular bus data receiving method. The invention encodes the data packet distribution destination according to the form of the sending mask by establishing the bus receiving table, and realizes the automatic distribution of data by comparing with the partition mask. The invention modularizes the core part of data receiving and distributing, only needs to update and maintain the bus receiving table when the content, quantity or distribution demand of the data packet changes, the main software program does not need to change.
Description
Technical Field
The invention belongs to the aviation bus data receiving and distributing technology, and relates to a convenient modular bus data receiving method.
Background
With the rapid development of avionics and digitization technologies, an aviation electromechanical bus becomes a nerve center of an electromechanical system and has a very important position, the electromechanical system is more and more complex in function cross-linking, the data volume transmitted on the bus is gradually increased, the data content and distribution requirement of the bus are frequently changed in the initial stage of project development, and how to quickly and effectively receive and distribute bus data is one of key technologies for electromechanical system design.
The bus data transceiver module in the electromechanical system needs to acquire data packets sent by other systems from the bus and distribute the data to each destination partition for subsequent data processing according to the system function requirements. In the traditional method, each specific data message is judged, and after the data message is received, the data is distributed to each destination partition according to the system requirements, when the number, the content or the distribution requirements of the data packets are changed, design codes need to be repeatedly modified, the change amount is large, and the codes cannot be transplanted and reused.
Disclosure of Invention
The purpose of the invention is: the modular bus data receiving method is simple in logic, small in code amount and convenient to maintain.
The technical solution of the invention is as follows: a modularized bus data receiving method is characterized in that a bus receiving table is established, a data packet is distributed to a destination, the destination is coded according to a sending mask mode, and the data packet is distributed to the destination in a mode of comparing with a partition mask of the destination.
Establishing a data distribution unit for each data packet transmitted on the bus in the bus receiving table, wherein the data distribution unit comprises a logic number, a sending mask and a message ID; the logic number is an input parameter of a bus receiving function, and a specified data message can be obtained from the bus according to the logic number; the transmit mask is a set of binary codes, each bit corresponding to a destination partition; the message ID is the unique identifier of the data message specified in the interface control file.
For the data packet in the data distribution unit, if the data packet needs to be sent to the partition, the corresponding bit of the partition in the sending mask is 1, otherwise, the corresponding bit is 0.
The modularized bus data receiving method comprises the following specific processes:
step 1: establishing a bus receiving table according to the system bus interface control file;
step 2: establishing own partition mask for indicating respective addresses for each data packet sending destination partition;
and step 3: calling a bus receiving function, receiving a required message according to the logic number of the current data distribution unit in the bus receiving table, and combining the message ID and the data to form a message to be sent;
and 4, step 4: reading a sending mask in a current data distribution unit and a partition mask of a first partition to carry out bitwise comparison operation, and if the bitwise comparison result is 0, representing that the partition does not need the packet of data and not carrying out any operation; if the result of bitwise and is not 0, the partition needs the packet of data, and at this time, a partition sending function is called to send the message to be sent to the partition.
And 5: and repeating the step 4, and carrying out bitwise comparison operation on the sending mask and the second partition. Until all destination partitions have been compared.
Step 6: and repeating the step 3-5, receiving the data message in the next data distribution unit in the bus receiving table, and detecting and sending until all the data distribution units in the bus receiving table complete receiving and distributing.
The partition mask has only 1 bit as 1 and the rest bits as zero, and the partition masks of the destinations are respectively: 0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080, 0x0100, 0x 0200.
The modular bus data receiving method has the advantages that the steps 3-5 are solidified into the main program, when the data package is added or the distribution purpose of the data package is changed, the main program does not need to be additionally changed by only modifying the bus receiving table, and the main program calls the updated data receiving table to realize the distribution of the data package.
The invention has the advantages and positive effects that: the modular bus data receiving method sends all bus data to the designated partition by traversing the data distribution units in the bus receiving table, and has the advantages that when the bus data volume is large and the requirement changes frequently, the bus receiving module designed by the method only needs to update and maintain the bus receiving table when the data requirement changes, a main software program does not need to be changed, the logic of the method is simple, the code volume is small, compared with the traditional method, the compiling and maintaining efficiency of the codes is improved, meanwhile, the risk caused by the large change of the software codes is reduced, and the system safety is improved.
Drawings
Fig. 1 is a schematic diagram of a data receiving and distributing process according to the present invention.
Detailed Description
The present invention is described in further detail below.
The modular bus data receiving method of the invention encodes the data packet distribution destination according to the form of the sending mask by establishing the bus receiving table, and realizes the automatic distribution of data by comparing the sending mask and the partition mask of the destination partition according to the bit and comparison mode. The main scheduling workflow is shown in fig. 1:
step 1: establishing bus receiving table according to system bus interface control file
Setting N bus data messages in a system interface control file, firstly establishing a bus receiving table, wherein the table comprises N data distribution units, and each data distribution unit comprises a logic number [ logic num ], a sending mask [ deviversemask ] and a message ID. The logic number is an input parameter of a bus receiving function, a designated data message can be obtained from a bus according to the logic number, a sending mask is a group of binary codes, each bit corresponds to a destination partition, and for the data message in the distribution unit, if the data message needs to be sent to the partition, the corresponding bit of the partition in the sending mask is 1, otherwise, the corresponding bit is 0; the message ID is the unique identifier of the data message specified in the interface control file.
Step 2: establishing own partition mask for each destination partition:
the partition mask has only 1 bit as 1 and the remaining bits as zeros. If the system has M destination partitions, the partition mask of each destination partition is M total of M1 and M2 … … Mn … … Mm: 0x0001, 0x0002, 0x0004, 0x0008, 0x0010 … ….
And step 3: and calling a bus receiving function, receiving the required message according to the logic number [ logic Num ] of the current data distribution unit in the bus receiving table, and combining the message ID and the data to form a message to be sent [ PackBuff ].
And 4, step 4: comparing the sending mask in the sending current data distribution unit with the partition mask of the destination
Reading a sending mask (DeliverMask) in a current data distribution unit and a partition mask M1 of a first partition to perform bitwise AND comparison operation, wherein if the bitwise AND result is 0, the partition does not need the packet of data and does not perform any operation; if the result of bitwise and is not 0, it represents that the partition needs the packet of data, and at this time, a partition sending function is called to send a message to be sent [ PackBuff ] to the partition.
And 5: repeating the step 4(M times) to perform bitwise and comparison operation on the transmission mask [ deviversemask ] in the current data distribution unit and the partition mask Mn of the next partition. Until all destination partitions have been compared. The data distribution in the data distribution unit is completed.
Step 6: and 3-5(N times) of the main program is repeated, the data message in the next data distribution unit in the bus receiving table is received, the comparison operation is carried out with the partition mask of each destination partition, and the automatic detection distribution is completed until the N data distribution units in the bus receiving table complete the receiving and the distribution.
In summary, the modular bus data receiving method of the present invention encodes the data packet distribution destination in the form of the transmission mask by establishing the bus receiving table, and realizes the automatic distribution of data by comparing with the partition mask. The invention modularizes the core part (step 3-5) of data receiving and distributing, only needs to update and maintain the bus receiving table when the content, quantity or distribution demand of the data packet changes, the main software program does not need to change.
Claims (5)
1. A modularized bus data receiving method is characterized in that a bus receiving table is established, a data packet is distributed to a destination, the destination is coded according to a sending mask mode, and the distribution of the data packet destination is realized in a mode of comparing with a partition mask of the destination;
establishing a data distribution unit for each data packet transmitted on the bus in the bus receiving table, wherein the data distribution unit comprises a logic number, a sending mask and a message ID; the logic number is an input parameter of a bus receiving function, and a specified data message can be obtained from the bus according to the logic number; the transmit mask is a set of binary codes, each bit corresponding to a destination partition; the message ID is the unique identifier of the data message specified in the interface control file.
2. The modular bus data receiving method according to claim 1, wherein for the data packet in the data distribution unit, if it needs to be sent to the partition, the corresponding bit of the partition in the sending mask is 1, otherwise it is 0.
3. The modular bus data receiving method according to claim 1, characterized in that the specific procedure is as follows:
step 1: establishing a bus receiving table according to the system bus interface control file;
step 2: establishing own partition mask for indicating respective addresses for each data packet sending destination partition;
and step 3: calling a bus receiving function, receiving a required message according to the logic number of the current data distribution unit in the bus receiving table, and combining the message ID and the data to form a message to be sent;
and 4, step 4: reading a sending mask in a current data distribution unit and a partition mask of a first partition to carry out bitwise comparison operation, and if the bitwise comparison result is 0, representing that the partition does not need the packet of data and not carrying out any operation; if the result of bitwise and is not 0, the partition needs the packet of data, and at the moment, a partition sending function is called to send the message to be sent to the partition;
and 5: repeating the step 4, and carrying out bitwise comparison operation on the sending mask and the second partition; until all destination partitions are compared;
step 6: and repeating the step 3-5, receiving the data message in the next data distribution unit in the bus receiving table, and detecting and sending until all the data distribution units in the bus receiving table complete receiving and distributing.
4. Modular bus data receiving method according to claim 3,
the partition mask has only 1 bit as 1 and the rest bits as zero, and the partition masks of the destinations are respectively: 0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080, 0x0100, 0x 0200.
5. The modular bus data receiving method as claimed in claim 4, wherein steps 3-5 are solidified into a main program, and when the purpose of adding or distributing the data packets is changed, the main program calls the updated data receiving table to realize the data packet distribution only by modifying the bus receiving table without additional change.
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| CN111143212B (en) * | 2019-12-24 | 2023-06-23 | 中国航空工业集团公司西安飞机设计研究所 | Functional logic function library verification method under module integrated software architecture |
| CN113141289B (en) * | 2021-05-18 | 2022-07-26 | 卡斯柯信号有限公司 | Bus data transmission method for trackside safety platform |
| CN116129681B (en) * | 2023-04-07 | 2023-06-20 | 南京莱斯信息技术股份有限公司 | Civil aviation telegraph shunting processing system and method based on regional gridding management |
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