Identification method of USB device with virtual drive
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A technology of virtual optical drive and identification method, which is applied in the direction of electrical digital data processing, instruments, input/output to record carriers, etc.
Inactive Publication Date: 2010-10-06
SICHUAN JIUZHOU ELECTRIC GROUP
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This method adds an additional logical interface to make the USB device necessarily a USB composite device. When the device is inserted for the first time, because the driver of t
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[0016] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0017] In this embodiment, the host computer selects standard configurations commonly used in the prior art, and the operating system can select versions such as WinXp, Vista, and Win7 of the Windows operating system. When the USB device is exposed as a single interface, the computer host will think that the USB device at this time is a USB virtual CD-ROM drive, and the computer host will load the standard driver program usbstor.sys for the USB device through the Windows operating system. If the device has not been registered Register the driver service item in the registry, and the Windows operating system will also register the service item USBSTOR in the registry for the USB device; when the USB device is exposed as a multi-interface, the host computer will think that the USB device at this time is a USB composite device. Load the USB comp...
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Abstract
The invention relates to an identification method of a USB device with a virtual drive. When the USB device is plugged into a computer host, the processing flow of the USB device comprises the following steps: A. carrying out various initialization operations by the USB device; B. arranging identifiers; C. starting the USB device and determining the state of the identifiers in a memorizer; D. processing the request for acquiring character string descriptors sent by the computer host by the USB device; E. executing the operation of the USB virtual drive if the identifiers in the step D are in state 1; and F. executing the operation of a USB compound device if the identifiers in step D are in state 2. The invention has the advantage that by the principle and method, no matter whether the Windows operating system of the computer host is provided with the drive of the USB compound device with multiple interfaces or not, after the USB device is plugged into the host, the warning that the drive of the device can not be found can not pop up in the Windows operating system.
Description
technical field [0001] The invention relates to a communication technology between a USB (Universal Serial BUS, Universal Serial Bus) device and a computer host, in particular to an identification technology between a USB composite device and a computer host. Background technique [0002] USB devices refer to devices with USB interfaces, such as mouse, keyboard, printer, scanner, camera, flash drive, MP3 player, mobile phone, digital camera, mobile hard disk, external optical floppy drive, USB network card, ADSL Modem, Cable Modem, etc. Various external devices with USB interface. Because the USB interface has the advantages of fast transmission speed, convenient use, support for hot plugging, flexible connection, independent power supply, etc., there are more and more types of such devices. In the logical organization of USB devices, there are four levels of devices, configurations, interfaces, and endpoints. Each USB device can contain one or more sets of configurations....
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