USB通信接口在汽车行驶记录仪中的应用

【作者】 程慧玲；

【导师】 张永清；

【作者基本信息】 南京理工大学 ， 通信与信息系统， 2004， 硕士

【摘要】 汽车行驶记录仪主要用于对车辆行驶速度、时间、里程以及有关车辆行驶的其它状态信息进行记录、存储，并可通过通信接口实现数据的上载和下传。在该记录仪的开发过程中，本人的主要工作是设计和实现记录仪的通信接口部分，重点是USB接口通信技术，我们采用了U盘转移数据的方案。本文主要内容： 首先对汽车行驶记录仪的整体方案进行简介，然后对通信接口部分进行了详细介绍。 汽车行驶记录仪的通信接口包括：USB接口和RS232接口。本文将分别从两个部分进行介绍：硬件部分，先简介USB总线和RS232总线，然后描述其实现的电路原理图，并对涉及到的主要芯片(串口芯片MAX232、微控制器W78E54、USB接口芯片SL811HS)的功能、性能和使用，进行了详尽的描述；软件部分，先介绍了软件调试工具，然后分析了RS232数据通信协议和USB1.1协议，在此基础上，对其固件程序模块的功能及实现进行了详细的描述，并给出了相应的程序流程图，并且还对其间涉及到的海量存储协议、FAT16文件系统进行介绍。综合本文中的硬件和软件设计，实现了记录仪的RS232串口通信功能，和记录仪对U盘的读写功能。 最后给出了一个应用实例，并对该项目进行了总结。更多还原

【Abstract】 Vehicle traveling data recorder is used to record the status, such as velocity, time and mileage, of the vehicle and store the information that should be exported to the computer or other devices through the communication interface. In the study, the main work of mine is to design and realize the communication interface of the recoder, and my emphase is how to design the USB interface, we introduce the scheme of tranfering data. The main content of this paper includes:First, I introduce the whole of the vehicle traveling data recorder, and then discuss the communication interface of the recoder in detail.The communication interface of the recoder include: USB interface and RS232 interface. This paper will introduce them from two part :In the part of the hardware, firstly brief introduce USB bus and RS232 bus, then describe the circuit diagram of the recorder, and write up the information of the main chips(serial interface chip MAX232 singlechip W78E54 USB interface chip SL811HS), and write up some information about how to use them. In the part of the software, firstly introduce debugging tools, then analyze the RS232 data communication protocol and the USB 1.1 protocol; on these elements, write up the function of every software module, and draw the flow chart of the program; in addition, introduce mass storage protocol FAT file system, because in the program it needs some knowadge about them. We synthetize the hardware and software, and realize the function of the communication of RS232 serial interface the function of the recorder reading and writing USB disk.At last, i bring forward one example of the applications.and sum up the project.更多还原