The Study Of Property Of Real-Time In The Embedded Control System

There are many researchers who are interested in the area of embedded real-time system, from System on Chip (Soc) to the embedded real-time operation system (RTOS).Many application have been put in use in the system of embedded real-time control.With the rapid advancement of technology, many engineers construct their embedded system based on a RTOS. Compared with the fore-back-ground system, it brings many advantages which make the software standardization, let us predict the real-time ability of the software and make it easy to maintain.At the first, this thesis introduced the development of embedded real-time systems and the purpose of the research.In this paper, it is analyzed that in this system the embedded real-time (RTOS) is needed. Two RTOSes, RT_linux and uC/OS which are both published with source code, are compared in many aspects and the later is more appropriate for our purpose.It is important to determine the priorities of the tasks after the functions of the system is designed. In the past, it is done based on the only one of conditions to the tasks or just the experience of the single designer. A new method , according with the model of theory of fuzzy decision-making, which is resulted from the idea of fuzzy mathematics, is developed and a case is carefully studied.People have analyzed the characteristics of time responding For the independent multi-tasks in a real-time system. For the task-chain linked by many tasks to complete certain function, the author analyzes the characteristic of the time responding in theory. The analyses and experiment show that it is better for the low-to-high priorities of the tasks against the direction of data-flow than the opposite in the time-responding characteristic for one interrupt source. For multi-interrupt sources, a good method to arrange the priorities is put up.