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单片机操作系统RTX51原理分析与移植

作者:佚名   来源:本站原创   点击数:  更新时间:2007年08月25日   【字体:

一.课题要求:

仔细分析单片机操作系统RTX51的原理,将其移植到单片机实验平台上,并要求编写一个简短的程序来验证其运行的正确性(比如,编写两个具有显示不一样内容的任务)。

二.RTX51原理

注释:由于英文原文会比较好,所以我没有翻译过来(不过也写了部分的翻译),直接提取出来一些英文,总结在一起。

1.       进程管理( Task Management )

1)       进程类型( Classes of Tasks )

RTX-51 recognizes two classes of tasks:

1.       Fast tasks

n       Contain especially short responses and interrupt disable times.

n       Contain a separate register bank and a separate stack area (register banks 1, 2 and 3).(Figure 1)

n       Contain the highest task priority (priority 3) and can therefore interrupt standard tasks.

n       All contain the same priority and can therefore not be mutually interrupted.

n       Can be interrupted by c51 interrupt functions.

n       A maximum of three fast tasks can be active in the system.

 

2.       Standard tasks

n       Require somewhat more time for the task switching compared to fast tasks.

n       Share a common register bank and a common stack area (register bank 0).

n       The current contents of registers and stack are stored in the external (XDATA) memory during a task change.

n       Can be interrupted by fast tasks.

n       Can interrupt themselves mutually.

n       Can be interrupt by c51 interrupt functions.

n       A maximum 16 standard tasks can be active in the system.

 

 

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