JPH01144110A - Key input device - Google Patents

Abstract

PURPOSE:To realize the smooth key input operations by attaining the input of functions regardless of a prefix type or a simultaneous pressing type of the key input mechanism. CONSTITUTION:A key input device contains a CPU 1, a timer TM 2, a main memory MEM 3, a key input queue 4, a prefix flag 5, a keyboard KB 6, a function key 7, and a function key push bit F. Then the function inputs can be accepted for key operations of both prefix and simultaneous pressing types. Thus the input of functions are possible regardless of a prefix or simultaneous pressing type key input mechanism. Then the smooth key input operations are ensured.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention provides a CPU scan type keyboard in which function input is performed using a combination of specific keys (function keys) and general keys. The present invention relates to a key input device that enables input of each function key in the form of a button and a key pressed at the same time.

(Prior Art) In a CPU scan type keyboard, when a certain function is executed by a combination of a specific key (so-called function key) and a general key on the keyboard, a prefix type and a function key pressing means are used. There is a simultaneous press type. Here, the prefix type is an operation method in which a function key is pressed first, followed by a general key.
The simultaneous press type is an operation means in which a general key is pressed while a function key is pressed.

In conventional keyboards, only one of the prefix type and simultaneous press type operations was fixed. (Problem to be solved by the invention) As mentioned above, the conventional key input mechanism Only one of the two types of motions, either press or simultaneous press, was performed in a fixed manner. Therefore, when operating a device, the operator must recognize whether the key input mechanism of the device to be operated is a prefix type or a simultaneous press type, and use a different operating means for each device to be operated. This led to complicated operations.

The present invention has been made in view of the above-mentioned circumstances, and is designed to enable function input using both prefix type and simultaneous press type key operations in equipment equipped with an input mechanism that performs function input using a combination of specific keys and general keys. To provide a key input device which enables reception and enables function input without being aware of whether the input mechanism is a prefix type or a simultaneous press type.

[Structure of the invention] (Means and effects for solving the problems) The present invention is based on C
In a PU scan type keyboard, when a newly pressed key is detected by an interrupt program that is activated at fixed time intervals, it is determined whether a function key is pressed or not, and the pressed status of the function key is indicated. A means for adding a specific bit to a matrix code of a key whose press is detected and registering it in a key input queue, and a matrix code registered in the key input queue at the time of a key input request from a user program is a matrix code of a function key. means for determining whether or not the matrix code is a function key matrix code, and setting a specific flag (prefix flag) when the matrix code is a function key matrix code; means for converting the matrix code into a function key code when the flag is set or when the specific bit indicates that a function key has been pressed; It is possible to accept function input by key operation.This allows function input to be performed without being aware of whether the key input mechanism is a prefix type or a simultaneous press type, making key input operations smoother. can be done.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a configuration according to an embodiment of the present invention.

In Figure 1, 1 is C which controls the entire key input mechanism.
This is a PU, and executes the key input interrupt process shown in FIG. 2 and the key code generation process shown in FIG. 3 when a key input request is made from a user program. Reference numeral 2 denotes a timer (TM) used for various time monitoring including timer interrupts under the control of the CPUI. 3 is read by CPUI/
The main memory (MEM) is write-accessed, 4 is a key input queue provided in the memory 3, and 5 is a key input queue provided in the memory 3.
is a prefix flag similarly provided in the same memory 3. 6 is a keyboard (KB), and 7 is a "function" key provided on the keyboard 6.

The keyboard 6 has key switches arranged in a matrix at the intersection of the scan line and the return line, and the CP
The so-called C that performs key input by key scanning from U1
It is a PU scan type keyboard.

FIG. 2 is a flowchart showing the timer interrupt processing executed under the control of the CPUI, and FIG. 3 is a flowchart showing the key code generation processing executed under the control of the CPUI when a key input request is made from the user program. It is a flowchart.

The operation of one embodiment of the present invention will now be described with reference to FIGS. 1 to 3 above.

The CPU scans the keyboard 6 in response to interrupts from the timer 2 at fixed time intervals, and if there is a key input, generates the key matrix code (step S21.522 in FIG. 2).

Furthermore, when the CPU recognizes the key input state, it checks whether the "Function" key 7 is pressed at the same time, and if the "Function" key 7 is pressed, it adds "Function" to the key matrix code generated above. A function key press bit (F-"1") indicating that keys 7 are pressed simultaneously is added, and the same code is stored in the key input queue 4 in the main memory 3 (steps S23 to S525 in FIG. 2).

Further, when only the "function" key 7 is pressed (input), a key matrix code unique to the "function" key 7 is stored in the key input queue 4.

On the other hand, when a key input request occurs during user software processing, the CPU 1 retrieves a key matrix code from the key input queue 4 in the main memory 3, converts it into a key code, and returns the same key code to the user software. At this time, if prefix flag 5 is set, it is converted into a function key code and then returned to the user software (steps S31 to S34 in Figure 3).
゜S 38. S37).

Further, if the key matrix code taken out from the key input queue 4 is the key matrix code of the "function" key 7 itself, the prefix flag 5 is set (steps 531-S33 and S39-540 in FIG. 3).

In addition, if the key matrix code retrieved from the key input queue 4 is accompanied by a function key press bit (F-“1”) indicating that the “function” key 7 is pressed simultaneously, the key matrix code is converted to a function key code, and then the user Return to software (Steps 331 to S35 in Figure 3. 83B, 537)
.

Through the key input processing operations described above, a function key input mechanism that enables both prefix type and simultaneous press type operation input means can be realized, and even in the case of the prefix type, a null code can be generated when there is no key input. Can be returned to user software.

[Effects of the Invention] As detailed above, according to the key input device of the present invention, C
In a PU scan type keyboard, when a newly pressed key is detected by an interrupt program that is activated at fixed time intervals, it is determined whether a function key is pressed or not, and the pressed status of the function key is indicated. A means for adding a specific bit to a matrix code of a key whose press is detected and registering it in a key input queue, and a matrix code registered in the key input queue at the time of a key input request from a user program is a matrix code of a function key. means for determining whether or not the matrix code is a function key matrix code, and setting a specific flag when the matrix code is a function key matrix code; or when the specific bit indicates that a function key has been pressed, converting the matrix code into a function key code, the function key is controlled by both prefix type and simultaneous press type key operations. By having a configuration that can accept input, function input can be performed without being aware of whether the key input mechanism is a prefix type or a simultaneous press type, and key input operations can be performed smoothly. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a configuration according to an embodiment of the present invention, and FIGS. 2 and 3 are flowcharts showing the processing flow of the above embodiment, respectively. 1...CPU, 2...Timer (TM), 3...
Main memory (MEM), 4...key input queue,
5...Prefix flag, 6...Keyboard (
KB), 7... "Function" key, F... Function key press bit. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2

Claims (1)

[Claims] In a CPU scan type keyboard, a means for detecting a newly pressed key by an interrupt program activated at a fixed time interval, and determining whether or not a function key is pressed when the pressed key is detected by the means means for adding and storing a specific bit indicating a pressed state of the function key to the matrix code of the key whose press is detected; a flag that is set when the means determines that the matrix code is a function key matrix code, and a flag that refers to the flag and the specific bit when the matrix code is not a function key matrix code. , means for converting the matrix code into a function key code when the flag is set or when the specific bit indicates that a function key has been pressed. input device.