Design And Implementation Of Multi-protocol Wireless Adapter Software System Based On ARM

With the advancement of networking and intelligence,test systems show the development trend of heterogeneity,modularity and multi-nodes.In the face of the complexity of test scenarios and the diversity of measurement parameters,the traditional centralised and integrated automatic test system can no longer meet the current test requirements.In this context,a distributed automatic test system that is compatible with various wireless transmission technologies,with different wired bridging methods and adapted to multiple test equipment and terminal nodes will become the new development direction in the field of automatic testing and intelligent testing.As a medium for wireless interconnection and information translation between test systems and measurement terminals,multi-protocol wireless adapters play an important role.Based on the hardware platform of a multi-protocol wireless adapter designed and developed independently,this project will use the ARM embedded system as the main control core,combined with the concept of hierarchical and modular programming,to complete the six wireless communication functions of Wi-Fi,Wi-Fi Halow,LTE-M,Bluetooth,Zig Bee and Lo Ra,and to realise the multi-bus system with GPIB,LXI,USB,etc.The software design and development of the multi-protocol wireless adaptor with GPIB,LXI,USB and other multi-bus adaptors for test terminals.The main research elements of this thesis are as follows.1.ARM-based embedded system environment construction and application design:according to the system functional requirements,complete the cross-compilation environment construction,Boot Loader porting,kernel trimming,file system establishment and communication module driver porting,and design a set of applications that can realize multi-task concurrent processing such as wireless communication,instrument program control,wireless triggering,waveform return,etc.,and introduce Kalman filtering algorithm to implement the wireless timing trigger function.2.Wireless communication function design and implementation: study different wireless communication technologies and transmission protocols,and design wireless communication drivers and private transmission protocols that meet the requirements of the protocols to improve the reliability of the data.3.Design and implementation of instrument program control functions: Study the communication protocols of different bus standards and interfaces to adapt to various types of test resources and terminal devices,and design protocol-compliant instrument interface drivers,including GPIB interface drivers,USB interface drivers and LAN interface drivers,to realise the functions of instrument program control and real-time waveform return in a distributed system.The software design and development of the multi-protocol wireless adapter has been finalised through the above research elements.The test results of the whole machine show that the adapter can support GPIB/LXI/USB multi-bus interface and is compatible with Wi-Fi,Wi-Fi Halow,LTE-M,Bluetooth,Zig Bee and Lo Ra multi-protocol wireless communication systems,while the wireless adapter terminal has functions such as data timing transmission,wireless timing/random triggering and wireless extension.In summary,the multi-protocol wireless adapter software designed in this thesis can meet the design requirements.