基于嵌入式LINUX平台的车载网络系统.doc

天津工业大学 嵌入式系统（论文） 基于嵌入式LINUX平台的车载网络系统 姓 名 吕 春 豪 学 号 1030044097 学 院 电气工程与自动化学院 2011 年 6 月 22 日 摘要 μClinux为平台，实现了基于SJA1000的CAN设备驱动程序，整个系统具有高可靠性和较强的处理能力。除了CAN总线以外，本系统还将LIN总线应用到车载网络中，提出了车内低成本的CANL/IN混合网络体系结构。为了使CAN网络和LIN网络能够互连互通，设计了基于PIC18F248的CAN/LIN数据交换网关。它既是CAN节点，同时也是LIN总线上的主结点，将收到的CAN报文封装成LIN报文向LIN总线上转发，同时将收到的UN报文封装成CAN报文向CAN总线上转发，成功地实现了CAN总线和LIN总线数据的透明传输。 关键词：车载网络；CAN总线；LNI总线；μClinux；网关 Abstract With the rapid development of elctronic technique and the continuityimprovement of vehicle performance，the elctronic quipments on vehicle are becoming more and more. Traditional elctric systems mostly introduced point-to-point communication mode，little affiliation with them.That made the connection system complex.In order to adapt the development of the vehicle eletronic equipment，the in-vehicle network system has come forth.For example，CAN bus，LIN bus and FlexRay have been applied in in-vehicle networks ystem.Because of particular sturcture and stable performance of CAN bus，which applied in it is the most widely.In addition ,there is a disadvantage of high cost in CAN bus, the tagret of LIN bus is applying in low level communication among body net work module nodes. This paper is on the basis of familiar withCAN bus and LIN bus，considering characteristics of the embedded system,I have designed the in-vehicle newtork system based on embedded Linux platform. In order to managing the nodes of in-vehicle network efficiently and porcessing the data，I have designed the MCN(main control node) of the in-vehicle netwokr.That is carried out by the S3C44BOX MPU of ARM7 core，and the sotfware platform is μClinux.MCN realized the CAN device driver based onSJA1000，the whole system is more reliable and effieient. So it provides the sotfware and hardware enviement of extending to the in-vehicle information center in the future.Besides CAN bus，this system used LIN bus into in-vehicle network，and present low cost CAN/LIN mix network architecture for vehicle. In o