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The OSD Design of Vehicle Imfomation and Communication System Based on CPLD

Author: MouJun
Tutor: ShiGuoYong；GuoZuo
School: Shanghai Jiaotong University
Course: Software Engineering
Keywords: Complex Programmable Logic Devices On-screen display OSD design Automotive electronics
CLC: U463.6
Type: Master's thesis
Year: 2008
Downloads: 68
Quote: 0
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Abstract


The purpose of this research is added to the existing vehicle information and communication systems in the screen display OSD function to facilitate multi- channel video information processing and improve the human-machine interface design . By analyzing the working principle of the liquid crystal display drive , external OSD controller based on FPGA , graphics processor and CPLD many different design options . Requisition analysis of various design , select a design and production of the lowest-cost CPLD design . Proposed four mechanisms possible the OSD data transfer outside the system OSD controller : data latch mechanism , MCU waits for the mechanism , time display LCD scanning mechanism and the use of blanking clearance mechanism . The MCU pass the OSD data of core program of decomposition , the completion of the core data manipulation instruction cycle consumption base sequential analysis from the C language to be compiled assembler clear . Selected on the basis of the most viable and reliable data latch mechanism to deal with the OSD data transfer . The hosts added to OSD module software architecture developed object -oriented OSD graphics . Improve and optimize the software architecture of the host computer in the Vehicle Information and Communication System OSD module , not only rationalize the modular design of the program , combined with the practical difficulties of product diversity , use of flexible software design features of the OSD module , built-in test OSD the graphics and characters large reduce the production test time for products in mass production , but also to evaluate the performance of the video system for vehicle testing provides a new and efficient means of testing and evaluation . The hardware design is around the CPLD the latch control timing design , design of SRAM read and write data bus design and OSD video signal transmission channel . Hardware module I2C bus long-distance communication , and solve the problem of the OSD image transmission on the I2C bus interference harness design . The experiment proved CPLD-based external OSD controller design to achieve the desired goals , and further optimization of the experimental process the graphics font design , but also for the next step to improve the design of the OSD controller clear direction of efforts .

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