The Design And Implementation Of Wireless Conference Projection System Based On STM32

Wireless Local Area Network(WLAN)provides wireless communication service to people within a certain range of activity,which is the product of the combination of computer network and wireless communication technology.In recent years,with the rapid development of WLAN technology,WLAN has been widely used in various fields by virtue of its unique advantages of flexibility,convenience and low cost.As one of the standard of WLAN,its mature technology is comprehensively applied in various electronic devices.This not only promotes the popularity of electronic devices supporting WIFI function,but also makes the embedded devices that can access to WIFI become the focus of attention.Taking large-scale academic conferences as the application scenario and making the best of the mature WIFI technology and the growing popularity of mobile terminals,this thesis designs a wireless conference projection system which is movable,low cost,secure and reliable,fast and convenient to deploy and solves the problem that the listeners may not be able to see the screen information due to some objective factor.The system chooses the 32-bit embedded microprocessor chip STM32F103RGT6 based on the Cotex-M3 kernel as the control core,equipped with the wireless transmission module with the WIFI chip Marvell88W8801 as the core and the OLED module with OLED display as the core.Adopting the data transmission mode based on TCP protocol,the system achieves the function of the single-to-multipoint wireless screen transmission.The overall design of system has the advantages of small volume,low power consumption and low cost.Using wireless transmission,the conference projection system automatically distributes the screen image of the terminal used by the speaker to terminals of the participants at a certain frame rate,and the screen image is shown on the terminals in real time.Based on the in-depth study of the related technology involved in the system,hardware and software are respectively designed.For the part of hardware,the hardware circuit of the system consists of three parts:the minimum system required for STM32 working,the wireless module and the OLED module.STM32 realizes the control of the wireless module and the OLED module through the SDIO interface and the SPI interface respectively.The design of system circuit board makes use of the PCB design software:Altium Designerl7.The design of circuit schematic is completed first,then the design of PCB circuit board is completed.For the part of software,based on the transplantation of ?C/OS-? system and LwIP protocol stack,the configurator of the peripheral interface,the driver of the wireless module and the display program of the OLED module are designed.STM32 which is developed on Keil MDK platform with C language provides a series of services as the system management machine.As the client,mobile terminal realizes the screen image to send or receive by installing the corresponding client application developed on VS2010 platform with C#language or Eclipse platform with java language.Finally,the test is carried out.Wireless conference projection system based on STM32 is stable and has good performance,which can effectively meet the needs of users.In addition,with the advantages of WLAN,the system has high scalability and easy deployment.