Abstract
With the development of computer technology, corresponding technology and multimedia Technology, and the popularization of the use of computer, the computer system peripheral equipment becomes more and more. The equipment does not have unified standard of interface, installation and disposition of the equipment are more complicated. Comparing with the increase of the kinds of peripheral equipment and quantity, the PC traditional demonstrates their inherent destructiveness from system and user these two angles. Under this background, the serial bus USB in common use, which has become PC standard, has offered great convenience to the gathering of multi-point data. Utilizing USB can realize the datum gather, which is more effective, more economic, than the traditional way. The equipment adopting USB interface supports not plug without exception and the user can connect the equipment to the host computer, while the machine is working, having avoided the course of restart. Which is fed up by the user USB1.1 has stipulated two kinds of transferring rate, in a norm: the transferring rate of the full-speed way is 12Mb/s, and that of the low-speed is 1.5Mb/s. So, compared with interface of other types, the bus interface of USB’s inferiority embodies in here. Its transmission is suitable for all kinds of peripheral equipment, supporting hot plug. This text has the development approach and procedure of USB interface, thus realized the gathering of multi-point data by utilizing USB. The USB chip adopted in the design is PDIUSBD12.It’s usually used as the high speed parallel interface in common use to realize the communication with little controller in the little controller system, and it supports the transmission of local DMA, having introduced the development approach and course of the equipment driver procedure emphatically in the design of software and hardware of the interface in addition. The “USB interface chip + traditional single piece + functional circuit' module design method adopted in this design. Has high flexibility, which can reduce the tine of development, the rislc and expenses, thus can come to the solution of the most economic USB peripheral, hardware with the swiftest method. Through the advantages above, We can find out USB interface is an ideal of the communication interface.
Key Words: USB;PDIUSBD12;AT89C52;USB DRIVER;Windows DDK