厦门莫格电气自动化有限公司销售
HARRIS SD-099980-M1
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SD-099980-M1
SD-099980-M1
SD-099980-M1
应用支持子层是整个系统的第二枢纽，应用支持子层提供了设备硬件抽象层与应用层之间及仪表组函数库之间的连接，在层级职能上该层对硬件抽象做了进一步的封装，以便于应用层封装事件操作接口时调用，主要由传感器操作相关操作接口、数据存取相关操作接口、数据展示相关操作接口及数据传输相关操作接口组成。与仪表组函数库提供的接口相比，该层级接口偏重于硬件接口封装，它作为一个桥梁建立了系统其它功能组件与事件驱动核心之间的联系，为应用层和事件驱动核心提供更加易于使用的设备接口。
以传感器模块接口为例。整个系统运转过程中，传感器操作是***频繁的一个任务，整个系统基本上是围绕着传感器进行的，根据硬件模块化设计的方案可以确定传感器的操作涉及到实时数据读取、传感器信息读取、传感器诊断共计3个方面，对于MCU来讲其实是对SPI接口的一些读写操作，而这些读写基本操作在HAL中已经实现，本处需要设计一个接口，用来封装对传感器实时数据读取、传感器信息读取、工况诊断等操作，如图2-5所示。
图2-5 传感器模块应用支持子层接口
2.3 仪表函数库
仪表函数库实现了对仪表类产品软件模块的封装，主要包含通讯协议模块、文件系统、设备管理模块、算法模块、智能电源管理模块等，同时包含C语言部分标准函数，该套系统架构支持标准C函数库中的输入、输出函数及数学函数。仪表函数库的架构如图2-6所示。
图2-6 仪表代码库建设架构图
通过代码库建设，可以统一代码规范，统一常用函数接口，并避免重用性，提高嵌入式软件工程师的效率。
2.4 应用层
不同的设备有不同的应用场景，相同的设备又有不同的应用需求，如何系统架构的统一，尽量将程序员的工作量集中在实际问题处理上，而不是整个系统上？这要依赖于应用层的设计，应用层将实例化出人机交互事件、设备远程管理事件、数据上传事件、数据展示事件、实时数据采集事件、外部设备数据采集事件及历史数据存取事件等操作接口。在事件驱动中心中将执行上述事件处理函数，应用层及各层之间的关系如图2-7所示。如传感器数据上传事件，该事件工作主要粉两个方面，一是被动上传，即上位机有需求时启动上传，这种方式主要是应用于总分架构的总线中；另一方面是主动上传，这要根据具体的通讯协议，如A11通讯协议。同时在该事件中完成数据的合包与发送，该事件将调用通讯协议接口及通讯模块数据发送接口。
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