基于USB接口CAN总线网络监控系统设计方案.docVIP

基于USB接口的CAN总线网络监控系统设计 南京理工大学 硕士学位论文 基于USB接口的CAN总线网络监控系统设计 姓名：杜建峰 申请学位级别：硕士 专业：控制理论与控制工程 指导教师：徐志良;彭富明 硕士论文基于USB接口的CAN总线网络监控系统设计 摘要 CAN总线通信网络自上世纪八十年代由德国Bosch公司开发出来以后，经过二十 几年的迅速发展，以其独特的设计和极高的可靠性，在汽车应用领域中占据了主导地位。 然而，CAN总线标准协议只规范了数据链路层和物理层，没有具体制定应用层，造成 了各大汽车制造厂商使用的应用层协议各不相同，导致了检测CAN总线网络中数据的 工作不易展开，从而无法很好地对网络进行监控。 本课题就是在此背景下，设计开发了CAN总线网络通用的测试监控系统。该系统 采集并分析CAN总线上节点所发送的信息，监视节点的工作状况，同时发送指令至总 线，控制节点运作。为实现该测试监控系统，本文作了以下工作： (1)在深入研究CAN总线协议的基础上，给出了CAN总线网络监控系统的系统结 构，详细阐述了系统软、硬件设计与开发过程。 (2)与上位机通信采用USB通信方式，利用内部集成CAN控制器的MC9S12DJ64 和符合USB2．0规范的CY7C6801 3A，设计了USB．CAN转换器硬件电路，包括CAN接 口电路模块、USB接口电路模块和AD采样模块。 (3)结合专用开发环境给出了CAN通信和USB设备端通信的固件开发流程和程序结 构，设计了专门针对系统的USB设备驱动程序。 (4)在上位机开发了可视化监控软件平台，利用PASSAT B5 CAN总线舒适系统实验 平台，对系统进行测试和功能验证。 关键词：CAN总线，USB，固件，驱动，实时监控，测试 Abstract 硕士论文 Abstract Since its development by Bosch Corporation of Germany during 1 980s，CAN Bus communication network has occupied a dominant position in the area of automobile application with its high reliability and unique design after 20 years development．However, the standard protocol of CAN Bus only provides regulations on the data link layer and physical layer instead of application layer．Therefore，there is great disagreement on the application layer protocol among different automobile manufacturers，it leads to a considerably unsatisfactory supervision on the network due to difficulties involved in inspecting data within the CAN Bus communication network． In view of the aforementioned background．this paper tries to design a general testing monitoring system for the CAN Bus Network which analyzes information collected from the nodes on the CAN Bus，as well as supervising the performance of the nodes．In the meantime， the system sends back instructions to the Bus in order to take control over the performance of the nodes．The paper has conducted work as follows to realize the application of this system： (1)Structure of the testingmonitoring system for the CAN Bus Network is outlined after profound res