基于Cairo的组合式仪表HMI系统设计  

Design of Composite Instrument HMI System Based on Cairo

作　　者：郭健忠[1] 耿屹 谢斌 闵锐 GUO Jian-zhong;GENG Yi;XIE Bin;MIN Rui(School of Automobile and Traffic Engineering,Wuhan University of Science and Technology,Wuhan 430065,China;Wuhan Baohua Display Technology Co.,Ltd.,Wuhan 430081,China)

机构地区：[1]武汉科技大学汽车与交通工程学院,湖北武汉430065 [2]武汉保华显示科技有限公司,湖北武汉430081

出　　处：《计算机技术与发展》2021年第10期196-202,共7页Computer Technology and Development

基　　金：湖北省自然科学基金项目(2019CFB694)。

摘　　要：应用于中低端汽车市场的组合式汽车仪表一般采用低成本的系统设计方案,因此在人机交互界面(HMI)显示效果、信息呈现形式等方面与全液晶仪表存在一定差距。为使组合式仪表HMI系统能在保持低成本的同时具备丰富的信息呈现形式和更佳的显示效果,本设计在硬件选型上采用高性价比的全志F1c100s作为嵌入式HMI平台的微处理单元,在界面设计上优化了汽车HMI图层、场景结构与资源文件的封装方式,加快了软件对资源的加载速度从而间接提升画面帧率;在开发方式上,搭建了基于Cairo图形库的跨平台开发环境,简化了开发流程。HMI系统软件部分包含数据解析、事件队列、XML文件解析和图形抽象四个模块,以上模块在虚拟平台上完成开发、调试与优化后,移植到嵌入式平台运行验证。测试结果表明,该方案能以较低的软硬件成本实现可靠的功能性及更佳的显示效果。The low-cost system design scheme is generally adopted for the composite vehicle instrument applied in the middle and low end automobile market. Therefore, there is a certain gap in HMI display effect, information presentation form and other aspects with the full liquid crystal instrument. In order to make the instrument HMI system achieve a better display effect at a lower cost, this design adopts the low-cost Allwinner F1 c100 s as the micro-processing unit of the embedded HMI platform. In terms of interface design, the encapsulation mode of automobile HMI layer, scene structure and resource file is optimized, and the loading speed of software to resources is accelerated, thus indirectly improving the frame rate of pictures. In terms of development mode, a cross-platform development environment based on Cairo graphics library is built, which simplifies the development process. HMI program been designed for four modules: data parsing, event queue, XML file parsing and graphic abstraction. After development, debugging and optimization on the virtual platform, the modules are transplanted to the embedded platform to run verification. The test shows that the scheme can achieve reliable function and better display effect with lower hardware and software cost.

关 键 词：CAIRO 跨平台 人机交互界面 组合式汽车仪表 F1c100s 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]