Research And Implementation Of The Redundancy Communication And Control System Basede On VxWorks

According to the trend that airborne avionics systems develop for largecomprehensive, the realization of the system demands its control and operation abilityto grow stronger, and its reliability index to grow higher. This paper expounds thecharacteristics of the embedded redundancy communication and control system basedon VxWorks operating system. From the point of increasing system’s reliability andinstantaneity, we made double CPU redundancy design.In this paper, the dual CPU redundant communication and control technologies arestudied. Contrasted and analysised several current popular embedded operating system,according to the real-time and reliability and flexibility requirement, choosing theVxWorks real-time operating system. Put forward a kind of mutex mechanisms-PETOmutexes mechanism applicable to pre-emptive take over, solved the possible interlockproblem during the process of dual CPU redundant switch. This paper proposes a newinternal bus token backoff algorithm, verifying the return mechanism’s effectivenessbased on this backoff algorithm, decreasing the2.72%probability conflict when thedual CPU send data in return visit, improving the dual CPU redundancy communicationsystem’s reliability. Adopting the thought of multitasking modular, realized thehardware and software design of the redundancy switching module, the data acquisitionmodule, and the communication interface module. Study on multitask mixed schedulingalgorithm and complete the software simulation. Finally, complete the whole system’sfunction test, the results show that the system performance indexes satisfy the designrequirements.