基于FPGA的RS485总线故障注入系统设计OA

To address the issues in reliability testing of RS485 bus devices in the aerospace field,such as in-complete fault simulation,complex operations,and low efficiency,a comprehensive fault injection system that is capable of covering the physical,electrical,and protocol layers is proposed.By adopting a collaborative archi-tecture of"FPGA hardware control+host computer software configuration",taking an FPGA as the core con-troller,utilizing digital potentiometers and analog switch arrays are used to achieve precise simulation of physi-cal layer faults,including disconnections,short circuits,and impedance variations.Through digital-to-analog conversion,programmable noise generation,and adder circuits,adjustments in electrical layer signal amplitude,slope,and noise superposition are accomplished.Furthermore,by leveraging built-in protocol processing IP cores in the FPGA,dynamic injection of protocol layer faults-such as data bit flips,checksum errors,and transmission delays-is realized.Experiments demonstrate that the system can accurately generate and inject various types of bus faults,significantly enhancing the automation and coverage of testing.The proposed inte-grated design approach addresses the technical challenges of multi-level fault injection and provides an efficient and reliable testing method for robustness verification and reliability assessment of RS485 bus devices.