基于FlexRay总线飞行控制计算机串行接口单元设计与研究

Design and Research on Serial Input and Output Unit of Flight Control Computer Based on FlexRay Bus

摘要:

根据样例无人机飞行控制计算机对串行接口单元的接口资源和内部通信能力的需求,研究并完成了基于FlexRay总线串行接口单元的硬件设计和软件开发,同时从时间调度、总线余度和非冗余数据传输三方面设计了FlexRay总线的通信协议和余度管理机制;串行接口单元采用FPGA为处理器,通过串行接口实现了外部设备与飞行控制计算机的实时通信,并按照FlexRay总线的通信协议,实现了串行接口单元和CPU单元间信息的可靠传输,总线负载小于20%;测试结果验证了设计的正确性和实用性,符合设计指标,可满足样例无人飞行控制计算机串行数据通信需求。

Abstract:

According to the requirements of serial communication interface and internal communication capability of the serial input and output unit in the flight control computer of the sample unmanned aerial vehicle (UAV), the schematic and driver software of the serial communication unit based on FlexRay bus are designed, and FlexRay protocols and redundant management are realized in three aspects:slot allocation, bus redundancy and non-redundant data transmission. Using FPGA as the processor, in accordance with the communication protocols of FlexRay bus, the unit completes data transmission between serial communication unit and central processing unit, which realizes real-time communication between external devices and the flight control computer, and ensure the busload less than 20%. The test verifies the correctness and practicability of the design, which can reach the design targets and meet the serial communication demands of the sample UAV flight control computer.