CN100585577C - USB device, USB system and USB control method - Google Patents

Abstract

The subject of the present invention is that when inserting other USB devices of the same type as the previously used type into the host computer, or when inserting other USB devices of the same type as the previously used type into a different port, it is not necessary to perform the procedure again. Driver installation and various settings. When the USB device 1 is connected to the host computer 6, according to the transmission request from the host computer 6, together with the manufacturing source identification information and the type identification information, an identification number common to other USB devices is returned. In addition, when other USB devices 1 of the same type are connected to the host computer 6, when they are connected to the host computer 6, after returning the above-mentioned common identification number, according to the request from the above-mentioned host computer 6, the above-mentioned common identification number is returned again. The other identification numbers different from the identification number of the main computer 6 can identify the two devices.

Description

USB device, USB system and USB control method

technical field

The invention relates to a USB device, a USB system and a USB control method connected to a host computer through a USB (Universal Serial Bus) for operation.

Background technique

In the past, when a plurality of USB devices of the same type were connected through a USB port of a host computer, there were inherent identification numbers in the corresponding USB devices, and when connecting to the host computer, the identification number was notified to the host computer, thereby, Identify the corresponding USB device.

For example, in the scheme of the following patent document 1 (JP Unexamined Publication No. 2001-144769 ), in the corresponding USB device, a body identification number setter formed by a double column switch, a non-volatile ROM, etc. is provided, It has a unique identification number, and when each USB device is inserted, the host computer receives the body identification number together with the manufacturing source identification information and type identification information, and specifies the device to be communicated with based on it.

In addition, in the scheme of the following patent document 2 (JP 2003-316720 document), the serial number of the part adopted by the corresponding USB device is used as the identification number of the USB device, and when each USB device is inserted, the host computer receives This identification number designates the device of the communication destination based on it.

Patent Document 1: JP Unexamined Patent Publication No. 2001-144769

Patent Document 2: JP Unexamined Publication No. 2003-316720

Disclosed Scheme of Invention

The problem to be solved by the invention

However, among the above-mentioned USB devices, if other USB devices of the same type as those previously used are used in a host computer, since the host computer recognizes them as other devices, it is necessary to request the driver program again. The installation and various settings are cumbersome to operate.

On the other hand, it is also possible not to return the identification number of the corresponding device to the host computer. In this way, since the USB device of the same type is recognized as the exact same product, even when other USB devices of the same type are inserted, Still, there is no need to install drivers and various settings one by one. However, even in the case of the same product, since it is recognized as another product by being plugged into a different port, installation of a driver and various settings are still required.

The object of the present invention is to address such a problem that even in the case of inserting another USB device of the same type as the previously used one in the computer, or in the case of inserting the previously used USB device into a different port, There is no need to re-install the driver and various settings.

Technical solutions for solving problems

In order to solve the above-mentioned problems, the first invention described in this application is characterized in that, when connecting to a host computer, according to a transmission request from the host computer, the identification information common to the manufacturing source identification information, the type identification information, and other USB devices The number is returned together.

In addition, the second invention described in this application relates to the first invention, which is characterized in that when another USB device of the same type is connected to the host computer, when the host computer is connected, after the above-mentioned common identification number is returned, According to the request from the host computer, an identification number different from the above-mentioned common identification number is returned.

In addition, the third invention described in this application relates to a USB system, which is composed of a USB device and a host computer connected to the USB device, and is characterized in that when the USB device is connected to the host computer, it sends The manufacturing source identification information, type identification information and identification number common to other USB devices are sent back together, and the host computer manages the communication with the USB device according to the manufacturing source identification information, type identification information and identification number received from the USB device.

In addition, the fourth invention described in this application relates to a USB control method of a USB system composed of a USB device and a host computer connected to the USB device, wherein the USB device has the following processing steps, that is, in the When the USB device is connected to the host computer, according to the transmission request from the host computer, the manufacturing source identification information, the type identification information and the identification number common to other USB devices are returned together.

The effect of the invention

The USB device, USB system, and USB control program of the present invention have the following effects.

That is, in the first invention, when connecting to the host computer, the identification number common to other USB devices is sent back together with the manufacturing source identification information and the type identification information according to the transmission request from the host computer. Plug other USB devices of the same type as those previously used into the host computer, or insert the previously used USB devices into different ports, and there is no need to re-install the driver and various settings.

In addition, in the second invention, with respect to the USB device described in claim 1, when another USB device of the same type is connected to the host computer, when connected to the host computer, according to a request from the host computer, it returns to the By passing an identification number different from the above-mentioned common identification number, even if two USB devices of the same type are connected to the host computer at the same time, the host computer can recognize the corresponding devices.

In addition, in the third invention, when the above-mentioned USB device is connected to the host computer, the identification number common to other USB devices is sent back together with the manufacturing source identification information and the type identification information in accordance with the transmission request from the host computer. , the host computer manages communication with the USB device based on the manufacturing source identification information, type identification information, and identification number received from the USB device. Therefore, even if another USB device of the same type as the previously used one is inserted into the host computer, or the previously used USB device is inserted into a different port, there is no need to re-install the driver and perform various settings .

Also, in the fourth invention, when the USB device is connected to the host computer, the identification number common to other USB devices is returned together with the manufacturing source identification information and the type identification information according to the transmission request from the host computer. , so even if another USB device of the same type as the previously used one is inserted into the host computer, or if the previously used USB device is inserted into a different port, there is no need to re-install the driver and various settings. Certainly.

Brief description of the attached drawings:

Fig. 1 is a block diagram representing the basic structure of the USB system;

FIG. 2 is a flow chart showing the processing when a USB device is connected;

Fig. 3 is a flow chart showing processing when a second USB device is connected.

Explanation of labels:

Reference numeral 1 represents a USB device;

Label 2 represents CPU;

Label 3 represents RAM;

Label 4 represents ROM;

Label 5 represents a USB controller;

Label 6 represents main computer;

Labels 7 and 8 represent USB ports;

Reference numeral 9 denotes a USB cable.

Preferred Forms for Carrying Out the Invention

Embodiments of the present invention will be specifically described below according to the accompanying drawings. FIG. 1 is a block diagram showing the basic structure of the USB system. FIG. 2 is a flow chart showing processing when a USB device is connected. Fig. 3 is a flow chart showing processing when a second USB device is connected.

Example

FIG. 1 is a block diagram showing the basic structure of the USB system. The USB device 1 is connected to a host computer 6 through a USB controller 5 and a USB cable 9 . This USB device 1 includes CPU2, RAM2, RAM3, ROM4 etc., carries out the communication with host computer 6 through USB controller 5, USB cable 9 and USB port 7 (or 8), according to the instruction from host computer 6, carries out prescribed control actions.

The ROM4 stores manufacturing source identification information VID, type identification information PID, and identification numbers common to all products, such as "0000000000". In addition, if the USB cable 9 of the USB device 1 is inserted into the USB port 7 of the host computer 6, as shown in the processing flow of FIG. Device information such as VID and type identification information PID, the USB device 1 receives the request, and sends the identification number common to all products, such as "0000000000", together with the manufacturing source identification information VID and type identification information PID to the host computer 6 .

In the host computer 6, a dedicated driver program is loaded in the USB device 1 determined by the manufacturing source identification information VID, the type identification information PID, and the identification number. In addition, various setting data are received as required, and in the operating system, the driver program is installed. function as a part thereof, thereby establishing a communication connection with the USB device 1 .

In addition, the USB device 1 is connected, the prescribed processing is completed, the USB device 1 is disconnected from the host computer 6, and then a USB device of the same type as the previous USB device 1 but different from the previous USB device 1 is inserted into the host computer 6. in the USB port 7 (or 8). Also at this time, the host computer 6 receives the source identification information VID, the type identification information PID and the common identification number from the USB device. At this time, since the source identification information VID, type identification information PID and identification number are completely the same as those previously received from the USB device 1, it is determined that the host computer 6 is connected to the same USB device. In addition, since the driver and the like corresponding to the USB device are loaded, communication connection with the USB device can be established in this state.

In this way, by transmitting the identification number common to all products, when another USB device of the same type as the previously used one is inserted into the host computer 6, it is not necessary to re-install the driver and perform various settings. Therefore, even if a portable personal computer is carried between the studio and the house, and the same type of USB device is used in the studio and the house, since it is regarded as the exact same device, even if it is plugged into any USB port , can still be used normally.

However, when two USB devices of the same type are connected to the host computer 6 at the same time, the following problems occur. That is, from the perspective of the host computer 6, it is considered that two USB devices with the same identification number are connected at the same time, so the host computer 6 cannot distinguish between the two devices.

Therefore, when connecting a USB device that returns the same manufacturing source identification information VID, type identification information PID, and identification number as the USB device connected to the host computer 6, the host computer 6, as shown in FIG. The second USB device sends Vender SpecificRequests. The USB device that receives the information rewrites the identification number to the next value "0000000001", makes both DATA lines (D+, D-) low, and connects them again after being temporarily disconnected to become a new one with a different identification number. USB device, the host computer 6 can recognize it.

At this time, the rewritten identification number is stored in RAM3 as a volatile memory, so that when the first USB device is connected next time, the rewritten identification number is deleted and returned to the one stored in ROM4 as the identification number. The number "0000000000" can thus be identified as the first one.

In addition, in the embodiment described above, the example of using Vender Specific Requests has been described. The present invention is not limited thereto. It is also possible to use an instruction to change the predetermined identification number, or to notify the predetermined that the identification number has been connected. Device instructions, etc. to achieve.

That is, when using Vender Specific Requests, a method of predefining a sequence number change command through Vender Specific Requests and issuing the command through control (Control) transmission is used to change it. However, as another method, it is also possible to use Prescribe ), PJL and other control commands, define the serial number change command in the same way, and send the command through batch transmission. In the USB device, the basic method is generally to transmit control commands through control transmission, and to transmit data through batch transmission. The former is a commonly used method, but the latter can also be used.

Claims (4)

1. A USB device, characterized in that the device possesses, a memory and a USB controller, The memory accommodates, manufactures source identification information, type identification information, and an identification number common to other USB devices, The above-mentioned USB controller is connected with the host computer and communicates with it. When the above-mentioned host computer is connected with the corresponding USB device, according to the transmission request from the above-mentioned host computer, the above-mentioned manufacturing source identification information, type identification information and The common identification number mentioned above. 2. The USB device according to claim 1, wherein the above-mentioned USB controller is, in a state connected to the above-mentioned host computer, when other USB devices of the same type are connected to the above-mentioned host computer, return the above-mentioned After the common identification number, according to the request from the above-mentioned host computer, an identification number different from the above-mentioned common identification number is returned. 3. A USB system, characterized in that the USB system consists of a USB device and a host computer connected to the USB device, The above-mentioned USB device has a memory and a USB controller, and the above-mentioned memory contains, manufacturing source identification information, type identification information, and an identification number common to other USB devices, and the above-mentioned USB controller is connected to the above-mentioned host computer and communicates with it. When the above-mentioned host computer is connected to the corresponding USB device, according to the transmission request from the above-mentioned host computer, the above-mentioned manufacturing source identification information, type identification information and the above-mentioned common identification number are returned from the above-mentioned memory, The host computer manages communication with the USB device based on the manufacturing source identification information, type identification information, and identification number received from the USB device. 4. A USB control method of a USB system formed by a USB device and a host computer connected to the USB device, characterized in that, comprising the steps of: The above-mentioned host computer detects the connection of the above-mentioned USB device; When the above-mentioned USB device is connected to the above-mentioned host computer, the above-mentioned computer sends a device information request of the corresponding USB device to the above-mentioned USB device; The above-mentioned USB device accepts the request for the above-mentioned device information, and returns manufacturing source identification information, type identification information, and an identification number common to other USB devices; When other USB devices of the same type are connected to the above-mentioned host computer, after sending back the above-mentioned common identification number, receive the request from the above-mentioned host computer; After receiving the request from the host computer, return an identification number different from the common identification number to the host computer.

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