CN102970202A - 1553B bus communication method based on preemptive strategy - Google Patents
1553B bus communication method based on preemptive strategy Download PDFInfo
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- CN102970202A CN102970202A CN2012104893853A CN201210489385A CN102970202A CN 102970202 A CN102970202 A CN 102970202A CN 2012104893853 A CN2012104893853 A CN 2012104893853A CN 201210489385 A CN201210489385 A CN 201210489385A CN 102970202 A CN102970202 A CN 102970202A
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Abstract
The invention belongs to the technical field of computer buses, and in particular relates to a 1553B bus communication method. According to the technical scheme, a 1553B bus communication method based on a preemptive strategy comprises the following steps of: 1, calling a bus initializing module; 2, calling a bus message organization module; 3, calling a bus scheduling module; 4, calling a bus B-region sending module; 5, calling a bus A-region sending module; and 6, calling a returned message processing module. By the method, a message with a high priority level can preempt sending of a message with a low priority level, so that a working mode that the conventional bus message sending does not consider the priority level is changed; a phenomenon that non-important data occupies a bus communication channel for a long time is avoided; the message with the high priority level can be quickly responded; real-time transmission of important data messages is guaranteed; and the execution efficiency of a key instruction is improved. Moreover, the processing procedure is transparent to an application layer; a processing mode is encapsulated; and interfaces are uniform.
Description
Technical field
The invention belongs to the aerospace computer technical field, be specifically related to a kind of 1553B bus communication of message priority preemptive type strategy.
Background technology
Spacecraft is widely used the communication that the 1553B bus is carried out each equipment room at present, and CPU is held as BC, finishes the critical functions such as Telemetry Data Acquisition, remote-control data injection forwarding, real-time command transmission.But the transmission rate of 1553B bus is 1Mbps, and along with the spacecraft task becomes increasingly complex, the response time of its systematic function and important instruction need to be paid close attention to.The speed of transmission of messages and periodically different on the spacecraft 1553B bus, except transfer instruction information, (comprise periodically instruction and aperiodicity instruction, valid data length is less, length is fixed), (valid data length is longer also to need to transmit the telemetry intelligence (TELINT) of each equipment of spacecraft, length is unfixing, has some cycles), how reasonably to dispatch the various message on the 1553B bus, particularly realizing the quick response of significant data message, is an important content of spacecraft Design of Database Management System.
Spacecraft 1553B bus communication is had more research abroad, but to important data-message how fast response do not introduce, to the message severities classification with how not dispatch and introduce, be i.e. not detailed description of details technology.
Mainly there are the following problems for domestic existing spacecraft 1553B bus communication: most of spacecrafts are not distinguished priority to important data-message and other data-messages, putting into the same bus district sends, even the minority spacecraft has been divided the importance of data-message, but significant data and non-significant data all use same bus RAM district to carry out message communicating, and the importance when practical communication is identical.Like this, the significant datas such as key instruction are consistent with the importance of the non-significant datas such as telemetry intelligence (TELINT), if the bus message scheduler program is being processed a large amount of telemetries, can cause the higher instruction message of time requirement be can not get making an immediate response, can stop up the real-time Transmission of key instruction when serious, affect the execution of key instruction.
Summary of the invention
The objective of the invention is: overcome the deficiencies in the prior art, characteristics for data communication between spacecraft equipment, a kind of 1553B bus communication based on the preemptive type strategy is provided, its significant data message is set to high priority, general data message is set to low priority, in the bus message process of transmitting, the message of high priority can be seized the transmission of low priority message, after being sent completely Deng high-priority message, recover the transmission of low priority message, guarantee the quick response of significant data message, and do not affected the processing to the less demanding general data message of time urgency.
Technical scheme of the present invention is: a kind of 1553B bus communication based on the preemptive type strategy may further comprise the steps:
Step 1 is called the bus initialization module;
Initialized content comprises:
A. to the attribute definition of bus message piece; Its attribute comprises: bus message piece classification, bus message block format, the purpose corresponding with application data far put the memory block that length and the carrying application data of terminal RT subaddressing, bus message piece are far put in terminal RT address, purpose;
B. the address with all bus message pieces in the bus message buffering area is inserted in the idle message piece chained list;
C. message blocks chained list to be sent is carried out the definition of priority: first message blocks chained list to be sent is used for receiving key instruction, and priority is the highest; All the other message blocks chained list priority to be sent are successively decreased; The quantity of message blocks chained list to be sent is at least 2;
Step 2 is called the bus message molded tissue block;
The bus message molded tissue block obtains application data from the application process of CPU CTU, and from idle message piece chained list, transfer a plurality of bus message pieces according to the size of application data, in the future the application data of self-application process is put in the memory block of a plurality of bus message pieces after splitting, according to the attribute of the setup of attribute bus message piece of application data; The address of a plurality of bus message pieces of carrying application data is inserted in message blocks chained list to be sent corresponding to the priority of application data;
Step 3 is called the bus scheduling module;
Bus scheduling module according to priority from high in the end order is collected bus message piece in the message blocks chained list to be sent successively, and according to the type of priority, the bus message piece that priority is the highest calls bus B district sending module, changes step 4 over to; All the other bus message pieces call bus A district sending module, change step 5 over to;
Step 4 is called bus B district sending module;
Bus B district sending module sends the bus message piece to the RT end; After RT end message is returned, enter step 6; Since bus B district sending module send deposit in the memory block of bus message piece carry be the highest key instruction of priority, bus B district sending module interrupts the transmission state of bus A district sending module when sending, key instruction is preferentially sent to the RT end, after bus B district sending module is sent completely, recover again bus A district sending module and continue to send;
Step 5 is called bus A district sending module;
Bus A district sending module sends the bus message piece to the RT end; After RT end message is returned, enter step 6;
Step 6 is called the return messages processing module;
The return messages processing module receives from RT end message, and the message after will processing returns to application process; And insert in the idle message piece chained list address that again will finish the bus message piece of application data transmission.
The invention has the beneficial effects as follows: (1) the present invention since with bus message according to task classification prioritization, the priority of significant data be the height, the priority of non-significant data is low.The bus message of high priority sends in RAM B district, and low priority message sends in RAM A district, and the message in B district sends and can interrupt the transmission of A district, after B district message is sent completely, recovers the transmission in A district.Like this, the message of high priority can be seized the transmission of low priority message, having changed in the past, bus message sends the mode of operation that does not have priority, avoided the non-significant data long period to take the bus communication channel, so that high-priority message can respond fast, for the real-time Transmission of important data-message provides guarantee, improved the execution efficient of key instruction.
(2) the present invention uses the bus message molded tissue block automatically to organize the bus message piece according to the data category that application process provides, and be inserted in the corresponding priority chained list, then calling the bus scheduling module realizes the transmission of message and returns, the message of realization high priority is seized the message of low priority, this processing procedure is transparent to application layer, processing mode encapsulates, and interface is unified.
Description of drawings
Fig. 1 is running environment schematic diagram of the present invention;
Fig. 2 is system configuration schematic diagram of the present invention;
Fig. 3 is bus scheduling module flow chart of the present invention;
Fig. 4 is bus A of the present invention district sending module flow chart;
Fig. 5 is bus B of the present invention district sending module flow chart.
Embodiment
Referring to accompanying drawing 1, it is the BC end that the present invention runs on CPU CTU, be input as the data that application process is imported into, comprise the inner director data that generates of remote control injecting data, telemetry, real-time command data and CPU etc., be output as by the 1553B bus to remote control forwarding data, real-time command data, the built-in command data of RT end transmission and the telemetry of returning to application layer.
Referring to accompanying drawing 2, based on the 1553B bus communication of preemptive type strategy, it may further comprise the steps:
Step 1 is called the bus initialization module;
Initialized content comprises:
A. to the attribute definition of bus message piece; Its attribute comprises: bus message piece classification, bus message block format, the purpose corresponding with application data far put the memory block that length and the carrying application data of terminal RT subaddressing, bus message piece are far put in terminal RT address, purpose;
B. the address with all bus message pieces in the bus message buffering area is inserted in the idle message piece chained list, but the memory block of bus message piece is write state at this moment;
C. message blocks chained list to be sent is carried out the definition of priority: first message blocks chained list to be sent is used for receiving key instruction, and priority is the highest; All the other message blocks chained list priority to be sent are successively decreased; The quantity of message blocks chained list to be sent is at least 2;
Step 2 is called the bus message molded tissue block;
Referring to accompanying drawing 3, the bus message molded tissue block obtains application data from the application process of CPU CTU, and from idle message piece chained list, transfer a plurality of bus message pieces according to the size of application data, in the future the application data of self-application process is put in the memory block of a plurality of bus message pieces after splitting, according to the attribute of the setup of attribute bus message piece of application data; The address of a plurality of bus message pieces of carrying application data is inserted in message blocks chained list to be sent corresponding to the priority of application data, and this moment, the memory block of bus message piece was write state;
Step 3 is called the bus scheduling module;
Bus scheduling module according to priority from high in the end order is collected bus message piece in the message blocks chained list to be sent successively, and according to the type of priority, the bus message piece that priority is the highest calls bus B district sending module, changes step 4 over to; All the other bus message pieces call bus A district sending module, change step 5 over to;
Step 4 is called bus B district sending module;
Bus B district sending module sends the bus message piece to the RT end; After RT end message is returned, enter step 6; Since bus B district sending module send deposit in the memory block of bus message piece carry be the highest key instruction of priority, bus B district sending module interrupts the transmission state of bus A district sending module when sending, key instruction is preferentially sent to the RT end, after bus B district sending module is sent completely, recover again bus A district sending module and continue to send;
Step 5 is called bus A district sending module;
Bus A district sending module sends the bus message piece to the RT end; After RT end message is returned, enter step 6;
Step 6 is called the return messages processing module;
The return messages processing module receives from RT end message, and the message after will processing returns to application process; And insert in the idle message piece chained list address that again will finish the bus message piece of application data transmission, but the memory block of bus message piece is write state at this moment.
Referring to accompanying drawing 4, in the above-mentioned steps five, bus A district sending module to the step that the RT end sends the bus message piece is:
A. the content in the data storage area of each the bus message piece that will collect of bus A district sending module is write the RAM A district of 1553B bus;
B. bus A district sending module arrange 1553B bus configuration register 1 when the proparea be 1553B bus RAM A district, replacement RAM A district stack pointer begins to locate to RAM A district stack, and the number that the message number is the bus message piece is set, and the startup transmission.
Referring to accompanying drawing 5, in the above-mentioned steps four, the bus B district sends submodule and to the step that RT sends the bus message piece is:
A1. bus B district sending module at first stops the transmission in 1553B bus RAM A district;
B1. the content in the data storage area of each the bus message piece that will collect of bus B district sending module is write the RAM B district of 1553B bus, bus B district sending module arrange 1553B bus configuration register 1 when the proparea be bus RAM B district, replacement B district stack pointer begins the place to RAM B district stack, the number that the message number is the bus message piece is set, and starts transmission;
C1. bus B district sending module arrange 1553B bus configuration register 1 when the proparea be bus RAM A district, recover the transmission in 1553B bus RAM A district, end.
In the above-mentioned steps six, the method that return messages are processed the submodule processing messages is:
After the returning of RT end message, be stored in 1553B bus RAM A district or RAM B district, the 1553B bus writes to message according to different type of messages in the data storage area of bus message piece of former transmission application data; The bus scheduling module is called the return messages processing module, the return messages processing module is according to the bus message block format, process respectively, if BC-〉the RT form, read 1553B bus message status word and judge whether the bus message piece has sent successfully, if insert in the idle message piece chained list success then the address that again will successfully send the bus message piece of application data, if failure, then record sends wrong state, and insert in the idle message piece chained list address that again will unsuccessfully send the bus message piece of application data; If RT-〉BC form, RT-〉RT form, RT-〉form of RT broadcasting, then the message of returning is write in the data storage area of bus message piece that former carrying sends application data, and will carry the application process that content in the data storage area of bus message piece of return messages sends to CPU CTU, insert in the idle message piece chained list address that again will carry the bus message piece of return messages.
Claims (4)
1. 1553B bus communication based on the preemptive type strategy may further comprise the steps:
Step 1 is called the bus initialization module;
Initialized content comprises:
A. to the attribute definition of bus message piece; Its attribute comprises: bus message piece classification, bus message block format, the purpose corresponding with application data far put the memory block that length and the carrying application data of terminal RT subaddressing, bus message piece are far put in terminal RT address, purpose;
B. the address with all bus message pieces in the bus message buffering area is inserted in the idle message piece chained list;
C. message blocks chained list to be sent is carried out the definition of priority: first message blocks chained list to be sent is used for receiving key instruction, and priority is the highest; All the other message blocks chained list priority to be sent are successively decreased; The quantity of message blocks chained list to be sent is at least 2;
Step 2 is called the bus message molded tissue block;
The bus message molded tissue block obtains application data from the application process of CPU CTU, and from idle message piece chained list, transfer a plurality of bus message pieces according to the size of application data, in the future the application data of self-application process is put in the memory block of a plurality of bus message pieces after splitting, according to the attribute of the setup of attribute bus message piece of application data; The address of a plurality of bus message pieces of carrying application data is inserted in message blocks chained list to be sent corresponding to the priority of application data;
Step 3 is called the bus scheduling module;
Bus scheduling module according to priority from high in the end order is collected bus message piece in the message blocks chained list to be sent successively, and according to the type of priority, the bus message piece that priority is the highest calls bus B district sending module, changes step 4 over to; All the other bus message pieces call bus A district sending module, change step 5 over to;
Step 4 is called bus B district sending module;
Bus B district sending module sends the bus message piece to the RT end; After RT end message is returned, enter step 6; Since bus B district sending module send deposit in the memory block of bus message piece carry be the highest key instruction of priority, bus B district sending module interrupts the transmission state of bus A district sending module when sending, key instruction is preferentially sent to the RT end, after bus B district sending module is sent completely, recover again bus A district sending module and continue to send;
Step 5 is called bus A district sending module;
Bus A district sending module sends the bus message piece to the RT end; After RT end message is returned, enter step 6;
Step 6 is called the return messages processing module;
The return messages processing module receives from RT end message, and the message after will processing returns to application process; And insert in the idle message piece chained list address that again will finish the bus message piece of application data transmission.
2. a kind of 1553B bus communication based on the preemptive type strategy as claimed in claim 1 is characterized in that, in the step 5, bus A district sending module to the step that the RT end sends the bus message piece is:
A. the content in the data storage area of each the bus message piece that will collect of bus A district sending module is write the RAM A district of 1553B bus;
B. bus A district sending module arrange 1553B bus configuration register 1 when the proparea be 1553B bus RAM A district, replacement RAM A district stack pointer begins to locate to RAM A district stack, and the number that the message number is the bus message piece is set, and the startup transmission.
3. a kind of 1553B bus communication based on the preemptive type strategy as claimed in claim 1 or 2 is characterized in that, in the step 4, bus B district sending module to the step that the RT end sends the bus message piece is:
A1. bus B district sending module at first stops the transmission in 1553B bus RAM A district;
B1. the content in the data storage area of each the bus message piece that will collect of bus B district sending module is write the RAM B district of 1553B bus, bus B district sending module arrange 1553B bus configuration register 1 when the proparea be bus RAM B district, replacement B district stack pointer begins the place to RAM B district stack, the number that the message number is the bus message piece is set, and starts transmission;
C1. bus B district sending module arrange 1553B bus configuration register 1 when the proparea be bus RAM A district, recover the transmission in 1553B bus RAM A district, end.
4. such as claim 1 or 2 one kind of 1553B bus communication based on the preemptive type strategy, it is characterized in that in the step 6, the method for return messages processing module processing messages is:
After the returning of RT end message, be stored in 1553B bus RAM A district or RAM B district, the 1553B bus writes to message according to different type of messages in the data storage area of bus message piece of former transmission application data; The bus scheduling module is called the return messages processing module, the return messages processing module is according to the bus message block format, process respectively, if BC-〉the RT form, read 1553B bus message status word and judge whether the bus message piece has sent successfully, if insert in the idle message piece chained list success then the address that again will successfully send the bus message piece of application data, if failure, then record sends wrong state, and insert in the idle message piece chained list address that again will unsuccessfully send the bus message piece of application data; If RT-〉BC form, RT-〉RT form, RT-〉form of RT broadcasting, then the message of returning is write in the data storage area of bus message piece that former carrying sends application data, and will carry the application process that content in the data storage area of bus message piece of return messages sends to CPU CTU, insert in the idle message piece chained list address that again will carry the bus message piece of return messages.
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| CN103684948A (en) * | 2013-12-13 | 2014-03-26 | 中国航空工业集团公司第六三一研究所 | 1553B bus table ranking optimization method |
| CN104184681A (en) * | 2014-09-16 | 2014-12-03 | 南车株洲电力机车有限公司 | Method and device for communication between ECP system display terminal and head end control unit |
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| CN103684948A (en) * | 2013-12-13 | 2014-03-26 | 中国航空工业集团公司第六三一研究所 | 1553B bus table ranking optimization method |
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| CN107391526B (en) * | 2017-03-28 | 2021-04-02 | 创新先进技术有限公司 | Data processing method and device based on block chain |
| US10909085B2 (en) | 2017-03-28 | 2021-02-02 | Advanced New Technologies Co., Ltd. | Blockchain-based data processing method and device |
| CN109547312B (en) * | 2018-11-27 | 2021-01-01 | 中国航空工业集团公司洛阳电光设备研究所 | 1553B bus event message scheduling method sensitive to message interval |
| CN109547312A (en) * | 2018-11-27 | 2019-03-29 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of 1553B bus events message dispatching method of message interval sensitivity |
| CN110750473A (en) * | 2019-10-18 | 2020-02-04 | 天津津航计算技术研究所 | Message configuration processing method based on management table in 1553B bus BC mode |
| CN110750473B (en) * | 2019-10-18 | 2023-06-02 | 天津津航计算技术研究所 | Message configuration processing method based on management table in 1553B bus BC mode |
| CN112000605A (en) * | 2020-08-26 | 2020-11-27 | 北京控制与电子技术研究所 | Method and device for transmitting instructions and data |
| CN112114981A (en) * | 2020-09-09 | 2020-12-22 | 天津津航计算技术研究所 | Linked list-based 1553B bus message scheduling method |
| CN112114981B (en) * | 2020-09-09 | 2023-12-12 | 天津津航计算技术研究所 | 1553B bus message scheduling method based on linked list |
| CN112235207A (en) * | 2020-10-14 | 2021-01-15 | 天津津航计算技术研究所 | RT address-based 1553B message receiving method |
| CN114531315A (en) * | 2022-01-18 | 2022-05-24 | 北京临近空间飞行器系统工程研究所 | Information scheduling method and scheduling device for bus information chain |
| CN114531315B (en) * | 2022-01-18 | 2023-10-31 | 北京临近空间飞行器系统工程研究所 | Information scheduling method and scheduling device for bus information chain |
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