Design And Implementation Of Self-Developed WiFi Network Card Driver Extended Characteristics Under WDI Framework

The supply of wireless network cards for Windows laptops has been monopolized by international manufacturers such as Intel and Realtek.Although national wireless network card manufacturers have launched some network cards on the Windows platform,compared with international manufacturers,their competitiveness is seriously insufficient,and they lack the development of new features such as roaming and P2P(Peer To Peer end-to-end connecting)screen projection.In order to achieve independent innovation and get rid of the technological dependence on the United States,a well-known national ICT company deployed its layout on the Windows system based on a self-designed wireless network card.However,since this wireless network card was developed based on the Windows platform for the first time and is still in the preliminary stage of basic functions,it has not further expanded P2 P screen projection,roaming,power saving and other new functions,which seriously hindered its development and final commercialization.In order to solve the problem of the company's self-developed wireless network card lacking new features on the Windows platform and product commercialization,the laboratory I worked has cooperated with the ICT company to make efforts for the development of new features and the commercial use of the network card on the Windows platform.In response to the above problems,this thesis proposes a corresponding design plan,and has done the following work:1.Based on the wireless network card self-developed by the partner,a state machine for managing the P2 P device chain establishment is designed on the Windows platform.This state machine can operate stably for a variety of screen projection scenarios to ensure the normal operation of the screen projection business.A laptop equipped with a self-developed wireless network card can not only project to a large screen,but also project a mobile phone to the laptop to complete multi-screen collaboration.2.Based on the wireless network card developed by the partner,many modules such as roaming instruction,roaming optimization,and roaming link establishment state machine have been designed on the Windows platform,and the feature development of roaming handover has been completed.This design ensures that a laptop equipped with a self-developed network card can roam stably,greatly optimizing the user's online experience.3.Based on the wireless network card developed by the partner on the Windows platform,the network card device is powered off and the network card driver operates normally.The corresponding network card power management method is designed for the different system power states such as sleep and hibernation of the Windows operating system,and the goal of power saving is completed.The design and implementation of all the features of this thesis have passed the Microsoft HLK(Windows Hardware Lab Kit)certification,which meets the necessary conditions for the product to be commercialized on the Windows platform.