Design And Implementation Of Audio Source Node Based On The MOST50

In the progress of science and technology, fuelled by automobile industry inelectronic direction towards continuously. With the rise of the IT industry, automobileelectronic degree and level is also in constant improve, in order to satisfy the demandsof people, vehicle electronic equipment in the development of intelligent direction. Carafter hundreds of years of development, in the mechanical aspects has achieved greatsuccess, to make the car as an independent tools become more mature and stable. Afterthe third industrial revolution, the rapid development of electronic information industryaffected many areas, automobile industry has also been laid the branding of the ages.As a transportation tool car, its core lies in the power transmission and control, safeand effective convert chemical energy to kinetic energy. Limited to the technical levelbefore, the core part of the basic it is made of pure mechanical device to complete, butwith the development of the automobile electronic car these perform a variety of powertransmission and control device by vehicle electronic equipment to replace, vehicleelectronic equipment and the traditional mechanical device more light than agile andreliable, and in the progress of electronic technology driven, vehicle electronicequipment is also on the function more powerful and intelligent.In vehicle electronic equipment development, CAN bus standard put forward andwidely used is undoubtedly the car on the road of electronic milestone. Vehicleelectronic equipment in the standard bus agreement under the support ofstandardization, makes the vehicle electronic to the rapid development of the road. Notonly CAN later, and LIN, FlexRay etc bus protocol is proposed and is applied to thevehicle body. As one of the earliest car bus system, CAN and LIN, FlexRay etc busfocused on solving the problems of auto control system, and people for multimediasystem demands, the bus in the functions and development potential has a lot ofshortage, bus unit hardware and the shortage of the agreement that car multimediasystem development into the bottleneck. MOST bus as a special designed formultimedia data transmission, the agreement for high flow data set. MOST bus in carmultimedia applications opened before hardware resources and agreement on the limit,in the subsequent MOST50, MOST150more advanced standard, based on the MOSTbus and build car multimedia system has been more than can be transmitted betweenmultimedia equipment of high quality multimedia data, MOST150is vehicle electronicequipment in order to conform to the trend of the development of network and introduces node own proprietary MAC address for future car multimedia system accessthe Internet provides strong technical support.This paper emphatically discusses the MOST50structures, vehicle-mountedmultimedia network based from the experimental platform to the technicaltransformation of vehicle platforms. These job mainly involves two aspects, on the onehand, is to solve the problems at the aspect of hardware, the MOST universalexperimental platform node and peripherals with separate control chip and circuitcharacteristics, we need to choose the appropriate new master control chip in amodular form the original independent functions to control and management, theselection of new master control chip means that need to be done around the chip tocircuit design. On the other hand is to solve the problems at the aspect of software, thatis, how to effectively control and management for different modules, and embeddedsoftware has good stability, ease of use, scalability.In this paper to solve above two problems are given the following solution. Firstis the hardware aspect, we selected the nodes with MOST50standards department ofthe same kind of master control chip AVR32UC3B0256, compared to the MOST50standard node AVR32UC3B1256has more peripherals and hardware resources, inorder to master control chip and audio storage peripherals are connected. The benefitsof doing this is to minimize the hardware replacement for modifying the size of theunderlying drivers. Is software solutions, stability and system for potential long termconsideration, changed the embedded software development in this test mode, theoriginal independent node model for process control programming to object-orientedapplications on embedded operating system, embedded operating system is chosenhere FreeRTOS. FreeRTOS transplantation on AVR32transplantation Studiodevelopment environment, and the hardware needed for its lower environmentalrequirements and less resource-intensive and easy to use free, open source, and manyother advantages, introduce the embedded operating system on-board multimedianetwork is an important process of the intelligent direction.