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《计算机技术与发展》[ISSN:1006-6977/CN:61-1281/TN]

卷:

31

期数:

2021年10期

页码:

196-202

栏目:

应用前沿与综合

出版日期:

2021-10-10

文章信息/Info

Title:

Design of Composite Instrument HMI System Based on Cairo

文章编号:

1673-629X(2021)10-0196-07

作者:

郭健忠¹ ; 耿 屹¹ ; 谢 斌² ; 闵 锐²

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

Author(s):

GUO Jian-zhong¹ ; GENG Yi¹ ; XIE Bin² ; MIN Rui²

1. School of Automobile and Traffic Engineering,Wuhan University of Science and Technology,Wuhan 430065,China;

2. Wuhan Baohua Display Technology Co. ,Ltd. ,Wuhan 430081,China

关键词:

Cairo; 跨平台; 人机交互界面; 组合式汽车仪表; F1c100s

Keywords:

Cairo; cross platform; human machine interface; composite vehicle instrument; F1c100s

分类号:

TP311

DOI:

10. 3969 / j. issn. 1673-629X. 2021. 10. 033

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。

Abstract:

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 All winner F1c100s 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.

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更新日期/Last Update: 2021-10-10