Real-time Embedded Systems Research And Application

As various kinds of technology including microelectronics, communication, computer, control and semiconductor growing up quickly, and the demands for intelligent control becoming more and more complex in many fields such as industry, architecture, medical treatment, national defence etc. Real-time Embedded System is being widely used in recent years.In this paper, the author makes detailed study on the main components ofreal-time embedded system, including the core of hardware-------embeddedmicroprocessor, real time scheduling algorithm (such as Round Robin Scheduling, Rate-Monotonic Scheduling. Earliest Deadline First Scheduling, Highest Priority Scheduling etc.). Fault Tolerance. Real-time Network especially the Embedded Internet; then addresses a preliminary method constructing an E-Home on the basis of EMIT (Embedded Micro Internet Technology) in order to test and control kinds of home electrical- appliance remotely by Internet. After having studied a kind of realtime operating system kernel------(J C/OS II about its structure and key mechanism,the author ports it into an embedded microprocessor ATmegal03 successfully, designs a real time embedded system which can be used to control the central air-conditioning for comfortable temperature and humidity. Aimed at the complexity, uncertainty and delay of temperature and humidity control, a Fuzzy-PID control algorithm is used, which brings the system with good dynamic performance, static performance and strong robustness. According to the system's own features, some effective fault tolerant technology is applied, which increases the system's reliability to some extent.