Paper Keywords: embedded, S3C44B0X, real-time kernel? C/OS-Ⅱ transplantation
Is very necessary. Operating system is a general program. To apply it to your own embedded system, it must be written or rewritten according to the different processors used. Combined with examples, the embedded operating system based on S3C44B0X is analyzed. The porting process of C/0s-Ⅱ platform is studied. Finally, the successful implementation of the embedded development platform is verified by testing.
1, real-time kernel? c/OS-ⅱ
C/OS-II is a repairable, customizable and preemptive real-time multi-task operating system, which runs the highest priority task in the ready state. Most of the source code is written in portable C language, and a small part of assembly language code is compressed to a minimum, so that it can be used in microprocessors with different architectures [3]. ? C/OS-II is favored by many users because of its open source code, high execution efficiency and small occupied space.
Transplantation of 2 μC/ OS-II on S3C44B0X
Transplantation means that the real-time kernel can run on other microprocessors or microcontrollers. In this paper, S3C44B0X chip is used, and the development environment is Keil uVision3, which basically meets the development requirements. S3C44BOX is a SOC chip based on ARM7. The chip has the advantages of powerful on-chip function, mature technology, low cost, low power consumption and high performance.
The porting work mainly focuses on three files related to the processor [2]: OS _ CPU. H, OS_ CPU_ C. C, OS_ CPU _ a.s, where OS _ CPU. The H file mainly contains compiler-related data type definitions, stack type definitions, two macro definitions and several functions.
Because of gender differences, men and women will definitely feel differently about the world. The question is whether gender difference is the decisive factor affecting literary creation and acceptance. Feminists gave a very positive answer to this. Showalter believes that "women's writing is based on a kind of psychological and physiological experience: the unique physiological process experience of women such as puberty, menstruation, sexual psychology, pregnancy, childbirth, menopause and amenorrhea, and the unique psychological experience as a daughter, wife and mother." ⑥ Regarding the expression, Simon Bova, an undergraduate thesis in accounting, put forward that "only women who first turn themselves into works of art can become artists", and that "many women regard their bodies as the only available media for their artistic creation, so the distance between a female artist and her works of art often disappears dramatically", and many subversive texts describing the body have appeared. Simon believes that because the patriarchal culture is dominant, women don't have their own language, and they can't use the ready-made symbolic language belonging to the patriarchal culture. She only relies on her own body, and women "materialize their ideas through her body; She expresses her thoughts with her body. " ⑦ This kind of female writing, which describes the body and expresses women's hopes, is an "unbreakable language that will destroy barriers, grades, rhetoric and rules", so it is irrational, irregular and extremely destructive, and it is the destruction and subversion of the patriarchal culture. It challenges male discourse through a unique experience content, and then completes its digestion. Women listen to the mysterious voice of their own bodies and persistently prefer their secret hobbies, habits and emotions. They no longer pay attention to profound history and put aside their concern for the new world.