The Research Of Applying Embeded System Based On ARM To Wireless Portable Terminal

With the development of internet and the arrival of Post-PC times, the application of embedded system becomes popular. Now embedded technology has been the focal point of research. The embedded technology based on ARM has become a spot light of current embedded field.ARM-based microcontrollers because of cost-effective, extensive third-party support and the good universalness is bound to lead to the development and a very wide application, terminal equipment used in recent years and PDA is hot subjects, and the ZigBee appearring near two years is a wireless communications technology, which is IEEE802.15.4-based application software protocols involved in networking, security, and in home automation, industrial building automation control systems which are widely used.The basis on which design and research about wireless portable terminal stand, is several embedded elements and the situation of current wireless terminal are presented. The terminal consist of four aspects in application: LPC2220 based on ARM7TDMI,real-time operation system uC/QS-II,ZigBee wireless technique and graphic user interface—MiniGUI. The paper introduces the related technologies as well as hardware composition( LCM,Touch-Screen,SPI,ZigBee module) ,and analyze how to carry out hardware driver. And then restaurant order is taken as an example in order to use MiniGUI goes to design a simple interface. At last, the point to point model is given and some prospects about network construction are brought out for the further work in this field.The key techniques of this thesis are hardware design,software porting,GUI and wireless communication and so on. This thesis introduces every main controller's characteristic and application according to its function on the side of hardware; on the side of software, this thesis introduces hardware driver, and then shows the embedded system transplanting, at last presents simple GUI design,wireless communication interface design and its operation flow.This paper's innovation is the wirelessZigBee technology used in wireless hand handsets, affords a new wireless handset design. Use of limited hardware resources, Use of limited hardware resources, based on the low-end CPU and absence of MMU, the paper begins to design and develop a wireless handsets System of high-end performance close to. Take full advantage of the embedded operation system uC/OS-II multi-task and protection mechanisms, reasonably to coordinate some contradictions between the hardware resources and software systems.This article has six chapters. The first chapter introduces the research background of wireless handsets first, that is, a summary of four areas—the ARM microcontrollers, embedded operating systems, graphical user interface systems and wireless local area network technology. Then, describes current status and development trend of wireless portable terminal at home and abroad. Finally, shows its work and objectives. Chapter II first shows the construction of the system, and then introduces the hardware module one by one. After showing the driver design, in the third quarter IEEE.802.15.4 protocol standards and direct sequence spread spectrum technology is introduced. Chapter III is the transplantation of the operation system and graphical user interface MiniGUI for uC/OS-II transplant ,on the basis of which a simple user interface is designed. Chapter IV of communication interface design between wireless module and terminal. Chapter V gives system model, and takes the order system as an example a simple network application. Chapter VI, the research work and analysis of the results is given, while expounds the follow-up work in the future.