基于s3c44b0x的μcosⅱ的研究與實現(xiàn)

1、中南民族大學(xué)碩士學(xué)位論文基于S3C44B0X的μC/OS-Ⅱ的研究與實現(xiàn)姓名：宋明勝申請學(xué)位級別：碩士專業(yè)：計算機應(yīng)用技術(shù)指導(dǎo)教師：蔣天發(fā)20080520基于 S3C44B0X 的µC/OS-Ⅱ的研究與實現(xiàn) II ABSTRACT µC/OS-Ⅱ is a well-known open source real-time kernel. It is designed for embedded applications

2、. It has the performance and security of business level. However, it is just only an operating system kernel, and needs to be transplanted onto the hardware platforms of practical application systems. So it is necessary

3、to study the transplant method. In addition, it has some limitations, and needs to be improved to satisfy the application requirement. µC/OS-Ⅱ provides that a application system has a maximum of 64 priority levels.

4、It isn’t sufficient to satisfy the requirement of more complex applications. So it is necessary to expand its number of priority level. In addition, µC/OS-Ⅱ provides that all tasks have the different priority levels

5、. Practically it schedules the tasks fully based on their priority levels. However, some tasks don’t have different priority levels, in other words, they should be assigned the same priority level and be scheduled in the

6、 time-sharing strategy. This paper transplants µC/OS-Ⅱ kernel which is based on the S3CEV40 evaluation board of Embest Info&Tech Co.,Ltd.in Shengzhen, and analyzes the transplanting process. After analyzing the

7、algorithms and data structures on the ready list of µC/OS-Ⅱ,this paper expands its priority level number of 8×8 to 16×16 ensuring the time and space efficiency. Based on the priority schedule strategy of &

8、#181;C/OS-Ⅱ,this paper introduces the round-robin schedule strategy. It keeps the efficiency advantage of µC/OS-Ⅱ. The transplant and the improvements have been inspected and verified. The test results show that the

9、y reach to the expected focus. This paper also analyzes whether the improvements have some influences on the performance of µC/OS-Ⅱ.The studies show that the improvements keep the high performance of µC/OS-Ⅱ. S