| With the rapid development of the technology and the improvement ofpeople's continuously of safety awareness,the application range of accesscontrol system is more widely. Simple access control management systemcannot satisfy people's requirements for safety and functional, the access controlsystem puts forward more requirements, so it is necessary to design amulti-function access control system to meet people daily requirements. And theembedded system as a special computer system, It has high reliability and smallsize, low cost, power consumption also have very strict requirements. With thedevelopment of computer technology, embedded technology has become moreand more mature. Design of integrated access control system based onembedded system has great social and economic benefitsIn view of the above situation, this paper puts forward a kind of intelligententrance-guard and attendance system based on embedded system. This systemis the integration of advanced fingerprint identification and radio frequencyidentification function as one of the products, It has the advantages of simpleoperation, stable operation, complete functions, can be networked, extensibilityand so on, can be used to variety places that need identification or attendance.We proposed an overall design of the program after the detailed analysis ofthe terminal function requirement, the system use the Samsung S3C2410chipbased on ARM920T kernel as the microprocessor, it has higher frequency andthe rich interface module, to meet the overall performance of the system on thebasis of the requirements also satisfied the future requirements of functionextension. And then build system development environment, including theinstallation of cross-compiler tool chain, NFS service, building the TFTPenvironment. Study on the method of transplantation for Linux operating system,And U-Boot (guide to load the program), Linux kernel were transplanted, thefile system was customized.In view of the system functional requirements we design the overall softwaresystem, elaborated the specific design and Implementation of the pictures display module, audio and video module, storage module, identification moduleand communication module. The communication module design of two differentways, they are wired and wireless transmission, wired transmission mode usingEthernet and wireless transmission adopts the current popular WI-FITechnology, comparison of general terminal system based on GPRS wirelesstechnology, it has the advantages of high transmission speed, network mode issimple and the use of low cost, and so on. This system is programmed usingPython and C language. The code programmed by Python language can directlycall the C code, do't need to compile just can be performed, save the crosscompile process, be good for the transplantation for different platforms, betterthan the system that use of C language only.At the end of the paper, we do the single function test and the overall functiontest for the terminal system, the results show that, the system of single functionand the overall function were satisfied the requirements of system, its stabilityalso reached the expected goal. Comprehensive above work, this paper proposesthe design scheme has very high practical value, the related research work forthe same or similar field of study provides valuable reference. |
