Design And Implementation On Remote Secure Control System Based On XScale And Embedded Linux

In daily life, we would like to use 1,000 or more words to descript an important scene during the security surveillance. Supposing in one day, opening a standard web browser and entering a simple address, that important scene can be viewed in detail at anytime anyplace, so it is easy to find out this technique contains enormous attraction and that is only one of the advantages of remote video surveillance system. Under the background of the integration of security industry and the IT industry, it is an irreversible trend that the video surveillance market will to be specialized and network, while the remote security monitoring system based on embedded is in keeping with this trend. In this process of change, a large number of IT enterprises and security enterprises will face a very broad space for development and the excellent embedded remote safety monitoring system will of a leading position in this field.Embedded systems include embedded processors and embedded operating system. Embedded processors and the related functional expansion of the system's circuit structure the hardware platform. Embedded operating systems include the bottom-driven software associated with hardware, system kernel, device driver, communication protocols, a graphical interface, standardization browser and so on. Embedded operating system run on the embedded processor. Embedded operating system administers the processor and other hardware equipment in the bottom of processor, and it operates all application procedures. It shields the bottom of the details to provide a unified user interface. Application developers only need to be split into several independent modules for system development. This has greatly simplified the application design and shortened the development cycle, reduced repeating work, improved the efficiency of product development and improved the efficiency of knowledge innovation.Powerful embedded processors (such as the Intel XScale PXA255) and outstanding operating embedded system (such as Linux) have been developed, which makes embedded system used more widely, especially in the area of wasting electronic products. More convenient transmission network, the more media format, smaller size, greater storage capacity and enhanced functions of the expansion are the pursuit of a target of wasting electronic products. According to the application demands in this area, we study about "long-range safety monitoring system", ultimate design and implement of a "safety based on XScale and Linux Embedded Remote Monitoring System."Based on Linux and XScale embedded Remote monitoring system is designed to visit remote monitoring environment by Ethernet after end users in the allocation of appropriate IP's address by watch. By understanding the unusual circumstances of what happened, we can take appropriate measures. Design of the system hardware is divided into three key modules: Short message prompt module for the system come true the function to annunciate information; By putting warning messages to sent through GSM mobile phone operator, the unattended can be identified in a timely manner and to remove dangerous; Remote Control module complete wireless communications, transmitting audio and video signals between the PC and PXA255 by Ethernet, and then watch the whole system ; PXA255 processor signal acquisition module to expand the USB Host Controller, USB Host Interface makes PXA255 cope with the needs of occasions. The design of the outer circuit access on the USB Host Controller connect with video captured cameras, also completed a sensor data acquisition and alarm signal transmission. The system design and implementation process can be divided into the following steps :This system makes use of the Intel XScale PXA255 processor. We have designed the interface circuit of PXA255 processor and CS8900A, CS4297A, the ISP1161. Flash, SDRAM, LCD, and the expanded about the IDE interface. Synchronously, I designed the system hardware and realized the hardware platform of remote monitoring system. Intel XScale PXA255 processor introduced by Intel that is one of high performance embedded ARM, It supports the MMU of virtual memory management, it has the highest frequency of up to 400MHz; CS8900A is a 10 Mbps network controller for the terminal network communication; CS4297A is an Audio Codec, it has completed the audio recording and replaying; LCD do the terminals'display ;IDE effect a large-capacity data storage; ISP1161 which integrated USB hosts and USB Device function to provide point-to-point connecting is the USB interface. It has the characteristics of low power consumption and a 16 bit parallel output (PIO) and DMA interface. ISP1161 can connect with PXA255; it is fully compatible with USB2.0 specifications. Terminal uses 32M bytes of FLASH and 64M bytes of SDRAM to store date and operate procedures, and the type were E28F128J3A and K4S281632C. In the software system of network camera module is constructed based on embedded Linux. Embedded Linux kernel is Linux-2.6.12. PXA255 make use of the documents which is no buffer mechanism JFFS2 file system. File System includes application, module, configuration files, and a graphical interface and so on. The system's graphical interface is based on Embedded Linux systems. Video signal acquisition, compression and transmission are built on top of the graphical interface and embedded Linux.GSM wireless communication system using short message also has a two-way data transmission function, and performance is steady-going. The remote monitoring equipment of data transmission provides a powerful communications platform support. UART will be configurated in the document corresponding to the configuration script, and then the operation will be packaged into GSM category. GSM initialization, redact the function of reading the news , information access, retrieval call number and short message deletion to complete about the software-driven. Alarm function started sending SMS from GSM transmission of alarm messages. To simplify the system, an exceptional situation will be translated the fixed SMS in the pure English so that the watch monitors the specific environmental the situation and takes effective measures.In the operating system of Linux Redhat 9.0 run the arm-elf's tool muster to open up Server. Users visit the embedded security monitoring system by Microsoft Internet Explorer, and then it is expected to be achieved goal. Meanwhile, sensor can control alarm and network camera in the unusual circumstances. Real-time results can basically fulfil the design requirements.But cameras snapping and audio processing, the efficiency of transmission should be improved further. It also needs to improve image resolution by adding related chips (such as 2D graphics acceleration chip). The GSM module in short message sending and receiving information, by reason of the design of time limitations, is only informed of the functional of SMS alarm, and does not achieve in a short feedback. This increases the half-baked function of the system. It is playing a smart surveillance system. If the system improve on these aspects in the future, it will be further perfect. We will realize the full realization of the intelligent real-time remote monitoring.The system is a powerful data acquisition and remote monitoring capabilities to enhance the good of the long-range safety monitoring system performance; meanwhile system can be expanded, with a good software supportted, which would be able to satisfy the market demand and facilitate people's life. The system can be further expanded in terms of software and hardware to use in intelligent buildings, industrial manufacturing and video surveillance occasions.