A Master-Slave Serial Communication Method Based on Timing Interrupt Trigger

Abstract

The invention relates to a master-slave serial port communication method based on timing interruption triggering. A host is provided with M independent serial port data receiving buffer areas which are respectively used for receiving data of M slaves, and the specific method comprises the following steps of (1) setting a timer interruption at a fixed time point before each control period of the host is ended; (2) in the timer interruption, enabling the host only to send the number taking pulse signals to the slaves; (3) after the slaves receive the number taking pulse signals, sending the latest serial port data to a corresponding serial port data receiving buffer area in the host; and (4) at the beginning of the next control period, using the host to directly read the serial port data inthe serial port data receiving buffer area corresponding to each slave, and completing the one-time serial port communication. According to the method, a multi-task parallel processing strategy is reasonably utilized, the previous queuing waiting process during serial port communication of the host and the slave is optimized, and the serial port communication time of the host and the slave is saved.

Description

Technical field[0001]The invention belongs to the field of aerospace control, and relates to a serial communication method between a satellite attitude orbit control computer (AOCC) and a star sensor, especially for satellite control tasks with high control frequency and short control period.Background technique[0002]The small satellite developed on the CAST3000 platform needs to have the ability to quickly maneuver at a large angle and quickly enter a stable working state. It also needs to have the ability to maintain high attitude pointing accuracy and high stability during satellite imaging, so satellite attitude orbit control The subsystem must have the ability to respond quickly. The control period of the attitude orbit control computer is designed to be 125 milliseconds to meet the requirements of high-frequency and high-precision satellite control. In each control cycle, the attitude orbit control computer not only completes internal tasks such as sensor information acquisiti...

AI Technical Summary

Problems solved by technology

[0005] The technology of the present invention solves the problem: Aiming at the deficiencies of the existing technology, a master-slave serial communication method based on timing interrupt trigger is provided, which solves the problem of queuing and waiting when the host communicates with the slave serial port, and saves the communication time between the host and the slave serial port

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