KR20060068618A - Method for managing external device attached to the main system - Google Patents

Abstract

The present invention is intended to secure the system upon detachment (removal) of an external device attached to the system.

The method for detaching an external device attached to a system of the present invention includes: executing an APPLICATION for a user to perform at least one external device removal and activation; Requesting removal / activation of an external device; Generating a system interrupt in response to the request, and virtually notifying that the external device is physically interrupted; Virtually registering the removal / activation of the external device with a predetermined variable value, and setting the external device to removal / activation; The control unit calling an external device driver; Checking an external device and the variable value in an external device driver; If the variable value is registered as no external device, deeming that the external device does not exist and turning off POWER; And performing at least one operation of removing and attaching the external device after turning off the power of the external device. It is operated including.

Therefore, the present invention can safely remove or activate an external device attached to the system without damage to the system.

Description

How to manage external device attached to the system {Method for managing external device attached to the main system}             

1 is a view showing that a variety of external devices, such as a CF card or a USB 13, which is a storage device are attached to an insertion means in a system PDA.

2 is a view showing a configuration and operation process of removing and activating a CF card which is an external device according to the present invention;

3 is a diagram illustrating an application operation for setting safely remove hardware or safely active hardware according to the present invention.

Figure 4 is a flow chart showing in detail the operation of the present invention Figure 2

The present invention is to secure the system when detaching (removing) the external device attached to the system, and in particular, before the external device attached to the PDA is detached from the system, the variable value is set to be recognized as being detached from the system. The present invention relates to a method of managing an external device that can protect a system by setting / registering, checking the variable value, turning off the power, and then removing the external device.

Hereinafter, the related art and related art will be described.

FIG. 1 is a view showing that various external devices, for example, a CF card 12 or a USB 13, which is a storage device, are attached to the insertion means 11 in the PDA 10 as a system.

As shown in the drawings, various external devices such as Compact Flash (CF), Micro Drive (MD), Secure Digital Card (SD), Smart Media Card (SMC), Multimedia Card (MMC), and MS ( Memory Stick), MS Pro (Memory Stick Pro) and USB are attached to the system.

However, when the device is detached (removed) from the system while the device is attached to the system and used, the device driver checks the external device and temporarily shuts off the power supply, thereby damaging the system.

The present invention proposes to safely remove external devices attached to the system without damaging the system.

The present invention proposes to remove the external device from the system after powering off, by a variable value that the external device has been detached.

In addition, the present invention proposes that the variable value of the device can be set and registered as active again when the external device is powered off and not removed from the system.

The method for detaching an external device attached to a system of the present invention includes: executing an APPLICATION for a user to perform at least one external device removal and activation; Requesting removal / activation of an external device; Generating a system interrupt in response to the request, and virtually notifying that the external device is physically interrupted; Virtually registering the removal / activation of the external device with a predetermined variable value, and setting the external device to removal / activation; The control unit calling an external device driver; Checking an external device and the variable value in an external device driver; If the variable value is registered as no external device, deeming that the external device does not exist and turning off POWER; And performing at least one operation of removing and attaching the external device after turning off the power of the external device. It is operated including.

In addition, as an example of the present invention, if a specific variable value according to the presence of an external device is checked and the external device is registered, the device driver recognizes and operates the external device.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the present invention is outlined.

If external device is attached / detached from PDA system without any action, it can give a hardware shock to the system.

Therefore, if you select the device you want to remove from the system, the relevant device driver recognizes that the corresponding hardware is virtually missing, and after the power supply to the external device is cut off, the user is notified of the hardware removal message of the external device, The PDA can be protected by being detached.

Also, in using the external device, there are many modules using the CF interface.

There are various CF memory cards or various network cards, and when not in use, the momory card is not removed without accidental use, and the external device is recognized as not being used or attached by using the application program. safe.

In addition, if you do not remove the momory card but do not use the above method, the device is recognized as not attached to the current system, so it is possible to reduce power consumption of PDA by not supplying power. Normal operation is possible by recognizing momory card in device driver.

2 is a diagram illustrating a configuration and an operation process of removing and activating a CF card which is an external device according to the present invention.

As shown in the figure, an application 20 for safely removing and activating an external device, Kernel 21, which is a processing device including a controller and a memory for storing variable values, and a device driver for operating an external device And hardware 23 such as an external device CF card are constructed and operated.

The operation of the above configurations is as follows.

Safely remove hardware application program is executed by user. (201).

The application requires the removal or activation of the CF card (S 202).

It also generates a system interrupt that tells the kernel virtually that the CF card is physically interrupted. (S 203).

Accordingly, the virtual CF card removal or activation is registered in the global variable. (S 204).

The CF driver is called (S 205) to confirm the status of the CF devices and the variable value. (S 206).

Based on the confirmation result, the power is turned off or the power is applied. (S 207).

In the above, global variable refers to a variable in S / W, which is a variable that can be referred to throughout the system because it allocates a specific memory area, not a variable used only in a specific function.

Therefore, using a global variable allows you to maintain the state of the CF unless you specifically delete the contents of the allocated area.

For example, if there is no CF card, assign a global variable to 1 (ex, global_cf_satus = 1;), and if there is a CF card, assign a global variable to 0 (ex, global_cf_satus = 0;).

3 is a diagram illustrating an application operation for setting safely remove hardware or safely active hardware according to the present invention.

The description in the drawing is an example of configuring the safely remove hardware, in which case the USB memory is to be removed from the PDA.

4 is a flowchart illustrating an operation process of FIG. 2 according to the present invention in detail.

As shown in the figure, the user executes APPLICATION to perform at least one external device removal and activation. (S 401).

The controller is requested to remove or activate an external device. (S 402).

A system interrupt is generated in response to the request, and the controller is virtually informed as if the external device is physically interrupted. (S 403).

The virtual device is virtually registered to remove / activate an external device to a global variable, which is a predetermined value, so that the external device is set to remove / activate. (S 404).

 The controller calls an external device driver. (S 405).

 The external device driver checks the external device and the specific variable value. (S 406).

If the variable value is registered as no external device, the external device is regarded as not present and the external device is removed by turning off the power and removing the external device or checking a specific variable value according to whether the external device exists. If it is registered, the driver recognizes and operates the external device. (S 407, 408).

As described above, the variable value is set / registered to recognize that the external device has been detached from the system before the external device attached to the PDA is detached from the system, and the external device is removed after the power is turned off by checking the variable value. This is how to manage external devices that can protect your system.                     

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents.

It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Therefore, the above description is not limited to the scope of the present invention by the limitation of the claims.

As described above, the present invention can safely remove external devices attached to the system without damaging the system.

According to the present invention, when the external device is powered off and not removed from the system, the variable value of the device can be set / registered as active and used again.

Claims (3)

In performing one or more disconnecting and activating operations of one or more external devices attached to the system, Executing APPLICATION by the user to perform at least one external device removal and activation; Requesting removal / activation of an external device; Generating a system interrupt in response to the request, and virtually notifying that the external device is physically interrupted; Virtually registering the removal / activation of the external device with a predetermined variable value, and setting the external device to removal / activation;  The control unit calling an external device driver;  Checking an external device and the variable value in an external device driver; And If the variable value is registered as no external device, deeming that the external device does not exist and turning off the power; and removing an external device attached to the system, comprising: The method of claim 1, further comprising performing at least one operation of removing and attaching the external device after turning off the power of the external device. The device driver according to claim 1, wherein the device driver recognizes and operates the external device if the external device is registered by checking a specific variable value according to the presence or absence of the external device. Way.

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