| How to manage the interface which is between the computer and Input/Output device is an important scope of the application and research of computer .Except for the interface itself,the object of the research and application which is based on the interface inevitably includes operating system, signal sensor and signal processing circuit.The above technology's synthetic application has a close bearing on the collecting and processing of Input/Output device's signal.Now,with the rapid development of computer and electronics, there have been a great progress in the field of Input/Output device technology.Among this field,PCI has been a current standard interface of PC.And in order to accommodate the development of operating system, WDM has been a driver model adopted by industry generally.At the same time,in the respect of sensor's application,a high precision and high integrated incremental rotary encoder has been an outstanding one among the displacement sensors.Meanwhile,EDA technology and CPLD/FPGA chip applied in the signal processing circuit are approved by a great number of engineers who are engaged in designing the electronic device.Although there have been many application instances in the field of Input/Output device technology, we need an specific project and technology route aimed at an given application.In this thesis, we combine the introduction and analysis of relative technology to describe the accomplishment of a coordinate collecting device which is based on incremental rotary encoder.This device is an specific device applied to collect the corrdinate displacement of ground image's three-dimensional model created by full digital photogrammetric station.CPLD chip and VHDL are applied in this device to carry out the following work:phase control of the electrical pulse created by incremental rotary encoder, counting the number of electrical pulse, controling the state of signal processing circuit, exchanging data between this circuit and PCI control... |
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