1553B bus communication method based on preemptive strategy

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 [0001] The invention belongs to the technical field of aerospace computers, and in particular relates to a 1553B bus communication method with a message priority preemptive strategy. Background technique [0002] At present, the spacecraft widely uses the 1553B bus for communication between various devices. The central processing unit is used as the BC terminal to complete important functions such as telemetry data collection, remote control data injection and forwarding, and real-time command sending. However, the transmission rate of the 1553B bus is 1Mbps. As the mission of the spacecraft becomes more and more complex, its system performance and response time of important commands need to be paid attention to. The rate and periodicity of message transmission on the 1553B bus of the spacecraft are different. In addition to the transmission of instruction information (including periodic instructions and non-periodic instructions, the effective data length is...

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Problems solved by technology

[0003] There are many studies abroad on spacecraft 1553B bus communication, but there is no introduction on how to quickly respond to important data messages, no introduction on message importance classification and how to schedule, that is, the detailed technology is not explained in detail

[0004] The 1553B bus communication of existing domestic spacecraft mainly has the following problems: most spacecraft do not prioritize important data messages and other data messages, and send them in the same bus area, even if a few spacecraft divide the importance of data messages, However, both important data and non-important data use the same bus RAM area for message communication, and the importance in actual communication is the same

In this way, important data such as key instructions and non-important data such as telemetry information are of the same importance. If the bus message scheduler is processing a large amount of telemetry data, it will cause the instruction messages with high time requirements to not be responded immediately, and in severe cases, it will be blocked. Real-time transmission of key instructions, affecting the execution of key instructions

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