| The instrument of automobile is the main interface through which the driver can commute message with the automobile and the safely and economically running of the automobile is greatly influenced by it. Recently, with automobile electronical technology development .the traditional mechanical assembled instrument can no longer satisfy need more and more. Especially with the widely using of computer, micro- electronics and field bus communication technology, intelligent instrument based on microprocessor is the necessary trend of automobile instrument development.The paper introduces the measure method of automobile's main parameter ,CAN bus communication theory and some automobile hard ware ,for example automobile running recorder, clock chip, voice chip and LCD. The software is based upon present fashion and free mac OS UCOS-II that is based on the programming technology of multitask system and it brings forward the settling scheme of the instrument of automobile software with the mac OS UCOS-II and UCOS-II's transplanting TMS320LF2407A. The digitized measured parameters is in favor of commuting data with other electrical control systems and automobile control system's development and realization, which makes the instrument of automobile have a low cost, high reliability , comfort , expanding system function and improving wiring harness. Through amending system's parameter , the system's performance and measure can be change with clients' need. By amending system's parameter, it can make automobile instrument adapt all kinds of need on kind and range ,which can development automobile technology in general using, modularization, standardization and series, consequently predigesting producing arts and crafts and manufacture equipment.Finally, the instrument combining DSP and embeded mac OS UCOS-II achieves the instrument of aptitude digital automobile that is based on CAN bus. And also it achieves entirety protocol with other electrical control systems which is settle for design request.
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