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《华侨大学学报（自然科学版）》[ISSN:1000-5013/CN:35-1079/N]

卷:

第26卷

期数:

2005年第2期

页码:

168-171

栏目:

出版日期:

2005-04-20

文章信息/Info

Title:

Realization of Highly Precise Timing in an Embedded System of Real-Time Operation

文章编号:

1000-5013(2005)02-0168-04

作者:

洪健

华侨大学机电及自动化学院 福建泉州362011

Author(s):

Hong Jian

College of Mechanical Engineering and Automation, Huaqiao University, 362021, Quanzhou, China

关键词:

嵌入式实时操作系统;  μC/OS-Ⅱ;  定时;  时钟节拍

Keywords:

embedded system of real-time operation;  μC/OS-Ⅱ;  timing;  clock rate

分类号:

TH703

DOI:

10.3969/j.issn.1000-5013.2005.02.015

文献标志码:

A

摘要:

实时系统对定时服务的精度有较高的要求,μC/OSⅡ原有的定时服务实现较为简单,精度不高.因此提出一种能够提供更高精度定时服务的改进方法.通过采用动态更新的时间表,对任意随机发生的定时请求进行插值及记录,时间的属性以邮件方式传递.从而,使μC/OSⅡ在原有时钟节拍不变的基础上,提供对微秒级精度的任务级定时请求的支持,大幅度提高系统时间响应的准确性.文中给出具体的实现过程.

Abstract:

Real-time system requires a fairly high precise timing service. However, original timing service of the simple μC/OS-Ⅱ is not high enough in precision. Therefore, the author puts forward an improved method which is able to offer a timing service with higher precision. By adopting a time schedule of dymamic renewal, the arbitrary timing requirement occurring randomly can be interpolated and registered while the attribute of time can be transfered in the form of postal item. Thus the support can be given to a timing requirement which is at task level and is of microsecond precision while the μC/OS-Ⅱ remains to be in original clock rate; the precision of the time response of system can be greatly improved. The exact processes of realization are given in the text.

备注/Memo

备注/Memo:

泉州市工业计划基金资助项目(2003G09)

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更新日期/Last Update: 2014-03-23