GPRS Data Terminal Based On Embedded System

With the rapid development of communication technology, GPRS wireless network with the Internet has been linked and become a resource of sustainable use and development. The embedded system because of low consumption and strong performance characteristics that is widely used in telecommunications, industrial control and other areas. In this paper the GPRS wireless data terminal was designed and realized to use the embedded system and the GPRS network. This terminal takes the S3C44B0X microprocessor as a center, through driving GPRS module of communication, connecting to the Internet by GPRS wireless network, achieving data transmission.The embedded production has already app1ied in IT field widely. The wireless data transmission model and systematical scheme were designed by the embedded technology which was using in the industrial monitor system. The scheme utilized the public mobile communication network GPRS as transmission platform to solve the problems in the current industrial special wireless transmission system such as expensive network construction, maintenance difficulties and etc. Then described the systematical components, access method and working mode, and analyzed the transmission proficiency and the stability about the system in this thesis.This scheme was composed of wireless data terminal unit and data service center. The main point of this thesis is the research and realization of wireless data terminal which is based on the embedded system. Put out the transmission model and technological scheme about wireless data terminal, that is, utilize the embedded ARM microprocessor and the embedded real-time operation systemμC/OS-ΙΙto accomplish the terminal. Build the hardware platform which dominant core is S3C44B0X and accomp1ished the realizations about S3C44B0X's periphery circuit, GPRS mode, memory mode and I/O mode. At the same time, in the software, according to the requirement of the system, the startup load program--Boot loader was designed and the real-time operating systemμC/OS-ΙΙwas ported to S3C44B0X. In order to meet the GPRS data transmission requirement, the light weight TCP/IP (LwIP) was ported toμC/OS-ΙΙsuccessively, and the app1ication program of wireless data transmission was designed aboveμC/OS-ΙΙoperating system.The GPRS wireless data terminal was realized in this topic, embedded in TCP/IP stack, can connect to the Internet through GPRS network, and real-time data transmission is strong, which provides the transparent data-transmission channel for users and have a wide range of applications in the power automation, environmental protection, transportation monitoring and other areas, particularly applicable to the mobile environment, wireless sites and remote areas.