The Research And Application Of Vehicle MOST Network Asynchronous Data Communication

With the development of the electronic and embedded technology, vehicle electronic equipment began to increase.The car integrated wiring and information sharing put forward higher requirements.The traditional point to point wiring technology has not adapt to the current car interior electrical system development.It must use advanced car bus technology.Now automotive manufacturers according to different applications use different bus system.Drive system and brake system,in the car,mostly through Controller Area Network, CAN, which is the most widely used C level Network standard, and with the increasing demand of multimedia entertainment, traditional bus technology has been unable to satisfy the higher bandwidth and lower interference requirements of the current multimedia.MOST bus,as a master-slave structure multimedia car bus technology, with its high speed, low cost, anti-interference,light quality, agile, etc advantages,become the basis of digital multimedia system backbone system in many cars.At present, Domestically, the most research about MOST network discuss transmit synchronous audio stream data, and not study or use packets form of asynchronous data. As a network transmitting multimedia data, the MOST network, not only can transfer audio and video streaming data, etc multimedia data, but also can transmit data as a similar Ethernet packets form.This paper focus on MOST asynchronous data transmission, and using the MOST asynchronous data transmission technology, designed a file transfer system based on MOST asynchronous data.In the first chapter, this paper detailed introduces the MOST bus technology, MOST bus technology structure and application layer structure, which provides a theoretical basis for the subsequent MOST asynchronous data transmission research. In addition, in the the last chapter of this paper, this paper summarized the work of this paper and give the research plans for the future.This article mainly research contents are as follows: First of all, around MOST asynchronous data communication, this paper describe MOST NetService software and its structure which is the German SMSC company authorized, and elaborate on MOST asynchronous data communication protocol, and main API which MOST NetService provide and asynchronous data communication related.This paper elaborate the implement of some important API.This paper focuses on MOST High protocol, and described the main API of MOST High Protocol in module which is offered by NetService software.Secondly, in the foundation of thorough researching the MOST asynchronous data communication, the paper puts forward a design scheme of the file transfer system,which based on MOST asynchronous data communication, and describe in detail the system function and architecture, the function of each module and its operation mechanism. The system can transmit any data file that a user require, through the use of MOST asynchronous channel, in MOST network.The paper elaborate the method of transmitting asynchronous data which use MOST High Protocol.The article also describe the transplantation process of MOST network software system.Finally, this paper manufacture a master node with the MOST network data transceiver module designed by myself, whose core is OS81092chip, and MINI6410development board.By MOST50network audio node as child node, PC machine and the master node above,the paper set up a file transfer system based on MOST asynchronous data communication.This paper provide hardware design scheme of the MOST network data transceiver.In the experiment, the article use the MOST network analyzer Optolyzer,which Germany SMSC company provided, and USART serial interface as a debugging tool to test the feasibility of the system. According to the MOST network analyzer Optolyzer, it shows completely the transmission process of MOST asynchronous data, and verify the system normal operation. The system can transmit data in MOST network using the asynchronous channel.