JPH0695777A - Keyboard control system - Google Patents

Abstract

PURPOSE:To provide a keyboard control system capable of solving the problems of the erroneous input caused by a quick input in a two-key lock-out system and the erroneous input cased by a misoperation in an N-key roll-over system and improving the operability of the key input. CONSTITUTION:Based on the key information of a depressed key, whether the depressed key is a two-key lock-out specification key or an N-key roll-over specification key is judged (step S5). In the case of the N-key roll-over specification key, the key information is made effective and a CPU is notified of it (step S6). In case of the two-key lock-out specification key, the number of times of the depressed key is confirmed (step S7). Only the key information of the key depressed at first is validated and the CPU is notified of it (step S8). The key information of the key depressed on and after the second times is invalidated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard control system, and more particularly to a keyboard control system including both 2-key lockout specification keys and N-key rollover specification keys.

[0002]

2. Description of the Related Art As a keyboard control method, a two-key lockout method and an N-key rollover method have been conventionally known. Here, the two-key lockout method is a method in which two keys cannot be entered at the same time. The key code of the first key pressed can be entered, but unless the key is released, You cannot enter the key code. On the other hand, the N-key rollover method is a method that allows you to enter any number of keys at the same time.
You can enter the key code of the next key to be pressed without releasing the key you pressed first.

A keyboard control system generally comprises a keyboard unit 10 and a control unit 20, as shown in FIG. Keyboard unit 1
0, the unit control unit 12 always senses the pressed or released key in the key matrix 11, and when the pressed or released event occurs, the interface 30 is used as the key information to the control unit 20 by the interface 30.
To transmit through. On the other hand, in the control unit 20,
The keyboard control unit 21 fetches the key information transmitted from the keyboard unit 10 according to the procedure determined by the interface 30, and interrupts that effect to the CPU 22 (IP
T). The CPU 22 reads the key information fetched by the keyboard controller 21 via the data bus 23.

In this keyboard control system, the unit control unit 11 on the keyboard unit 10 side controls the 2-key lockout system or the N-key rollover system.
In the case of the N-key rollover method, the key information is read one after another from the key matrix 11 and transmitted to the keyboard controller 21, and in the case of the two-key lockout method, only the key information pressed first is transmitted. To do. At this time, as shown in FIG. 5, when the keyboard control unit 21 confirms an event of pressing or releasing a key (step S51), the key information is not changed or only code conversion is performed to the CPU2.
2 was notified (step S52).

[0005]

However, in the conventional control method of the keyboard control unit 21, when a keyboard as shown in FIG. 3, that is, a keyboard including both numeric keys and function keys is considered, a two-key lockout is performed. It may be difficult to perform control regardless of the system or the N-key rollover system. That is, in the case of the 2-key lockout system, the numeric keypad (0
When ~ 9, +,-, =, ·) is quickly pressed, it may happen that two keys are accidentally pressed at the same time so that key input cannot be performed. On the other hand, in the N-key rollover method, there is a possibility that the number of cases in which the function keys (F1 to F7) are erroneously input by double input or the like will increase.

The present invention has been made in view of the above points, and in controlling a keyboard including a 2-key lockout specification key and an N-key rollover specification key,
The purpose of the present invention is to provide a keyboard control method that improves the operability of key input by solving the problems of incorrect input due to quick input in the 2-key lockout method and incorrect input due to incorrect operation in the N key rollover method. And

[0007]

In order to achieve the above object, the present invention provides a two-key lockout specification key and an N key.
In a keyboard control method that includes both key rollover specification keys and outputs the key information of the pressed key by the N key rollover method, the pressed key is a 2-key lockout specification key based on the key information of the pressed key. Or N key rollover specification key, the key information is valid in the case of N key rollover specification key, and only the key information of the first key pressed in the case of 2 key lockout specification key It is valid and the key information of the key pressed after the second time is invalid.

[0008]

In the keyboard, for example, the numeric keypad has an N-key rollover specification and the function keys have a 2-key lockout specification, while all the key information of the pressed keys is N from the keyboard unit side to the control unit.
Output by key rollover method. Then, on the control unit side, the specification of the pressed key is judged based on the fetched key information, and in the case of the 2-key lockout specification key, only the key information of the key pressed first is validated, and after the second time The key information of the pressed key is invalid. Thereby, simultaneous input by quick input can be permitted for the numeric keypad, and erroneous input such as double input can be prevented for the function key, so that operability can be improved.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 2 is a block diagram of a general configuration of the keyboard control system, and the basic configuration and the basic operation of each component are as described above. An example of the keyboard layout of the keyboard in the keyboard unit 10 is shown in FIG. As is apparent from the figure, the keyboard in this embodiment is provided with ten keys (0 to 9, +,-, =, ...) And function keys (F1 to F7).

In this keyboard, ten keys (0 to
9, +,-, =, ·) are N key rollover specifications,
Function keys (F1 to F7) are 2-key lockout specifications. Then, the key code for pressing / releasing each key is determined as shown in FIG. That is, the key code when the numeric key is pressed is (0XH), the key code when released is (8XH), the key code when the function key is pressed is (1XH), and the key code when released is (9XH).

Next, the processing procedure of the keyboard control system according to the present invention, which is executed by the keyboard control unit 21 in the keyboard control system having the above-mentioned configuration, will be described with reference to the flowchart of FIG. It should be noted that the unit controller 12 of the keyboard unit 10 uses the key matrix 1
When the key is pressed or released at 1, the keyboard control unit 21 is notified of the pressed or released key code. At this time, all the keys are treated as N-key rollover specifications, and the keys of the pressed keys at the same time. All the codes are also notified to the keyboard control unit 21.

First, the keyboard control unit 21 sets the count value P to P = 0 and the stored code value Q to Q = 0 by initialization.
It is set to 0H (step S1), and waits for a key press or release notification from the unit controller 12 (step S1).
2). When a key press or release notification is issued, first, the key code is discriminated to determine whether the information is press information or release information (step S3). If it is press information, that is, the key code is (0XH) or (1X
In the case of H), the count value P indicates that the key is pressed.
Is stored by setting P = P + 1 (step S
4).

Then, by further identifying the key code, it is determined whether the pressed key is the N-key rollover specification key or the 2-key lockout specification key, that is, the numeric keypad or the function key (step S).
5) In the case of the N-key rollover specification key, the key code is directly notified to the CPU 22 (step S).
6). On the other hand, in the case of 2 key lockout specification key,
It is determined whether or not the count value P is P = 1 (step S7), and only when P = 1, the key code is validated and the CPU 22 is notified, and at the same time, the release key code corresponding to the pressed key code is stored. The code value Q is stored (step S8). If P ≠ 1, that is, if the key is pressed after the second time, the key code is invalidated and the notification to the CPU 22 is stopped.

When it is determined in step S3 that the information is release information, first, the fact that one key is released is stored by setting the count value P to P = P-1 (step S9). Then, the key pressed by discriminating the key code is N key rollover specification key or 2
It is determined whether the key is a key lockout specification key (step S1.
0), in the case of the N-key rollover specification key, the key code is directly notified to the CPU 22 (step S).
11). On the other hand, in the case of the 2-key lockout specification key, it is determined whether or not the key code of the release key this time is the key code stored as the stored code value Q (step S12), and the stored code value Q is stored. Only when the stored key value is the registered key code, the CPU 22 is notified of the key code, and at the same time, the stored code value Q (0
0H) is stored (step S13).

As described above, the keyboard unit 10
The unit control unit 12 handles all the keys as N-key rollover specification keys to notify the keyboard control unit 21 of all the key information of the simultaneously pressed keys, while the keyboard control unit 21 always presses the key information. The number of keys that have been pressed, and for the two-key lockout specification key, the CPU2 of the key information of the key pressed after the second time.
By stopping the notification to 2, it is possible to allow simultaneous input by quick input for the numeric keypad which is the 2 key lockout specification key, and double input etc. for the function key which is the N key rollover specification key. You can block input.

[0016]

As described above in detail, according to the present invention, in the keyboard including both the two-key lockout specification key and the N-key rollover specification key, the key information of the pressed key is input from the keyboard unit side. While outputting all in the N key rollover method, the control unit side determines the specification of the pressed key based on the imported key information, and in the case of the 2 key lockout specification key, the key of the key pressed first By enabling only the information and invalidating the key information of the keys pressed after the second time, it is possible to allow simultaneous input by quick input for the two-key lockout specification numeric keypad, and
With regard to the function key of the key rollover specification, erroneous input such as double input can be prevented, so that the operability of key input can be improved.

[Brief description of drawings]

FIG. 1 is a flowchart showing a procedure of a keyboard control system according to the present invention.

FIG. 2 is a block diagram showing a general configuration of a keyboard control system.

FIG. 3 is a key layout diagram showing an example of a key layout of a keyboard.

FIG. 4 is a diagram showing an example of key codes of a press key and a release key.

FIG. 5 is a flowchart showing a procedure of a conventional example.

[Explanation of symbols]

 10 keyboard unit 11 key matrix 12 unit control unit 20 control unit 21 keyboard control unit 22 CPU

Claims (1)

[Claims] 1. A key control method for a keyboard that includes both a two-key lockout specification key and an N-key rollover specification key and outputs the key information of the pressed key by the N-key rollover method. It is determined whether the pressed key is a 2-key lockout specification key or an N-key rollover specification key. If the key is an N-key rollover specification key, the key information is validated, and if it is a 2-key lockout specification key. The keyboard control method is characterized in that only the key information of the first pressed key is valid and the key information of the second and subsequent pressed keys is invalid.