The Design And Implementation Of Scientific Instrument Working Condition Monitor Based On DM6446

As the basic condition of scientific research, large scientific instruments are thescience and technology development level symbol of a country, and they are also thepower of science and technology development. In recent years, the governmentincrease the investment of science technology industry, the number of large scientificinstruments has a considerable scale, and the number keep the growth of year afteryear. But compared with the needs of the development of our teaching and scientificresearch, the problem of the insufficient of large scientific instruments resources stillexist. At the same time there is a certain extent unreasonable phenomenon, such aslow utilization rate, insufficient sharing and irrational use of resources.Large scientific instrument working state monitoring system is responsible for theremote monitoring of the working state of the instruments, then establish an effectiveevaluation and supervision mechanism, thus precious resources of large scientificinstruments can have a more reasonable sharing and utilization. As an important partof the system, scientific instrument working condition monitor is the bridge betweenthe instrument switch machine natural features and the whole data system, it is alsoone of the key technology of the system. This dissertation design and implement akind of scientific instrument working condition monitor based on DM6446.Compared with the other schemes of instrument working condition monitors, it hasthe advantages such as non invasive detection, hardware acquisition and wide rangeof adaptation. In order to implement the design, there are following several aspects ofresearch and design work:(1) Research the hardware interface characteristics of DM6446processor andTVP7002video decoding chip, produce a circuit board that can be compatible withZeeis DM6446core board. Run the Linux embedded operating system in thehardware platform, research the software development method of DaVinciarchitecture.(2) Research the using method of DM6446processor and TVP7002videodecoding chip, code software with TI DVSDK tools, code device driver in the kernelspace, in order to configure the DM6446VPFE module and TVP7002, provide theinvoking interface to user space program in V4l2Framework. Then applicationprogram should be wrote in user space, via the invoking interface by the V4L2driver,the instrument working condition monitor can collect the VGA interface computerscreen image of a instrument workstation.(3) Design a template matching algorithm which is directed against computerscreen image, the algorithm combine normalized cross correlation algorithm andSSDA algorithm, considerate both matching precision and execution efficiency. Thetemplate matching algorithm is implemented base on TI DSP/BIOS LINK dual corecommunication software architecture. The ARM side is responsible for the controllogic, the DSP side is responsible for the specific algorithm. Prior to process thealgorithm, a template picture which has obvious features of machine switch status should be prepared. When processing, the algorithm program perform template matchbetween the template picture and a frame of acquired computer screen image, then aresult of the state of machine switch status will be exported.(4) According to the needs of the data encapsulation and network communicationin the large scientific instrument working state monitoring system, the function ofdata encapsulation and network communication should be implemented byapplication program. Considering the network interruption situation, a data packetbuffer function should be implemented too.