厦门莫格电气自动化有限公司销售
HARRIS SD-099980-M1
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HARRIS SD-099980-M1
HARRIS SD-099980-M1
HARRIS SD-099980-M1
2.5 事件驱动核心
事件驱动核心的主要功能是仲裁系统中各个任务的先后顺序。事件驱动核心的“心跳”在硬件抽象层完成，通过RTC时钟滴答进行判断或触发事件，设计这一部分目的是让应用层工程师专注于用户需求，因为大多数情况下，事件驱动核心及相关子层的设计是整个系统的核心任务，可以通过定期的维护和更新这个“内核”对产品进行升级。事件驱动核心与各层之间的关系如图2-8所示。
图2-8 事件驱动核心与各层之间的关系图
基于事件间的驱动接口可采用结构Event进行封装，该结构包含了当前事件和上一事件的信息，同时可以在事件之间传输数据指针，如下所示：
Struct Event{
CurrentEvent,
.PreEvent,
Pdata
}
3 结束语
本文介绍的分层设计、逐级调用的代码架构设计方法已经在新一代的智能仪表中使用，并取得了明显的效果。在智能仪表的软件代码设计中，利用这种分层的系统架构设计有如下优点：
（1）提高软件质量，缩短产品的开发周期。在仪表开发期，统一的函数接口和常用算法的统一管理，大大提高代码的可重用性，避免重复开发，从而进一步提升开发人员利用率，减少嵌入式代码工程师的工作量，缩短了产品的开发时间。
（2）简化设备后期的升级维护。在仪表维护期，清晰的程序结构和统一的接口可有效避免潜伏的BUG，提高产品的稳定性；在更改层的具体实现代码时，只要函数接口保持稳定，则不必修改其它函数，大大简化产品的升级维护工作。
参考文献：
[1] 贾灵,王薪宇,郑淑军,等物联网/无线传感网原理与实践[M].北京航空航天大学出版社,2011,1.
[2] 孟彦京,陈卓，事件驱动的程序设计方法在嵌入式系统中的应用[J].电气自动化,2009年06期.
[3] 李臣亮，事件驱动架构及应用[J].软件世界,2007年21期
[4] 何鸿君,曹四化,褚祖高,罗莉,宁京宜,董黎明,李朋，一种改进的事件驱动系统框架[J].国防科技大学学报,2008年03期
[5] 孙秋冬，软件系统的分层设计[J].计算机工程与应用,2001年第7期
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