Watchdog monitoring method suitable for flight control software

Abstract

The invention belongs to the field of airborne embedded software, and particularly relates to a watchdog monitoring method suitable for flight control software. Comprising the steps that 1, first setting is carried out on a watchdog and the watchdog is enabled in the first stage of flight control software execution, second setting is carried out on the watchdog and the watchdog is enabled in the second stage of flight control software execution, and the first stage is before computer starting, operation system loading completion and application program branch execution skipping; the second stage is a stage of executing a normal working mode, and the normal working mode is periodic application of the system; step 2, after the second setting is completed, executing interrupt hitching: hitching the watchdog interrupt to a Mache check interrupt source through an interrupt hitching function provided by an operating system, and completing trigger response hitching of an event type non-maskable interrupt; and step 3, after execution of the interrupt hitching is completed, performing a reset test according to the test judgment condition. And the special requirement of flight control software security is met.

Description

technical field [0001] The invention belongs to the field of airborne embedded software, and in particular relates to a watchdog monitoring method suitable for flight control software. Background technique [0002] Due to its special requirements of high safety and high reliability, flight control software usually uses watchdog technology to monitor the software execution process. In the process of software execution, it is necessary to periodically feed the dog. If the program executes abnormally or runs away, and the dog is not fed within the specified time period, the watchdog alarm will cause the watchdog to be interrupted, indicating that the system has not regularly fed the dog. The watchdog interrupt will invalidate the channel (CHV), and record the small frame count and fault code. However, in the commonly used watchdog monitoring method, the watchdog is only enabled when entering the flight control application program. For the program execution process from the com...

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: To provide a watchdog monitoring method suitable for flight control software, to solve the monitoring blind spot before jumping to execute the application program branch from the computer startup to the completion of the operating system loading, and the watchdog monitoring due to interrupt masking or high The problem of monitoring failure caused by priority interrupt trigger

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