Research And Improvement On Embedded RTOS Key Technology Based On μC/OSⅡ

With the development of info technology, the embedded system enlarged its application area. The original embedded software, such as foreground and background mode software, has been fallen behind. The embedded RTOS ( Real Time Operation System ), which can support multiple tasks and makes the application development much easier, brings about the privilege in maintenance and second-time development, and improves the stability and reliability as well.Based on theμC /OS II open ware operation system, some key technologies of RTOS are covered in this assay. Four typical open RTOS are concerned, and their technologies are compared. Furthermore, the technologies are discussed thoroughly, including task management, the synchronization and communication between interrupt and task, the storage management and interrupt management.The main work of this assay includes:1. The task management and task scheduler are thoroughly discussed. Besides, the original maximum task number is extended from 64 to 256. The dynamic task scheduling is brought about to improve the scheduler performance;2. Different task stack using strategies are discussed in different hardware platform, including independent task stack and global stack;3. The test platform is made to verify the technologies and improvements.There is no general solution for all the applications. Firstly, many factors are concerning with the RTOS performance. Improvement of one factor does not always lead to the improvement of the whole system. Secondly, different application means different performance goal. So every embedded system is a customized system, and solution should be made wisely according to the situation.