JPH11143637A - Touch panel controller and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict chattering and also to surely detect the depression of a touch panel by permitting a detection control means for detecting the input position of the touch panel to add information stored by means of a last time interrupting signal to this time information to store it. SOLUTION: A CPU 21 of a monitor device 2 receives the interrupting signal of a key gate array (key G/A) 27, stores information of the touch panel 23 and also investigate a position where the touch panel 23 is depressed and the position where it is not depressed. Then, the CPU 21 starts counting by the interrupting signal of the key G/A 27 and holds the state of the touch panel 23 just before interruption even at the time of the interruption of the new key G/A 27 for a time of about 40 m sec being the one when chattering generally occurs. Thus, chattering which ON/OFF within a prescribed time is repeated is prevented and also information by newly depressing the touch panel 23 is surely detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch panel for suppressing chattering that occurs when operating a touch panel provided on the surface of a display screen in a monitor device for monitoring the status of a robot or a numerical controller via a programmable controller or the like. The present invention relates to chattering control means and a control method.

[0002]

2. Description of the Related Art FIG. 7 is a hardware block diagram of a conventional monitor system having a personal computer as a screen data editing device, a monitor device, and a programmable controller (hereinafter, referred to as PC). In the figure, reference numeral 1 denotes a PC for controlling a device to be controlled such as a robot or a numerical control device;
A is a monitor for displaying device values sent from the PC 1 and forcibly setting device values of the PC 1, and 3 is a personal computer for creating screen data to be displayed on the monitor 2A.

In the PC 1, 11 is a CPU, 12 is a monitor I / F for communicating with the monitor 2A, 13
Is a memory in which system programs / sequence programs / device values of the PC 1 are stored.

In the monitor device 2A, 21A is a CP.
Reference numerals U and 22 denote a CRT, which is a display device equipped with a touch panel 23, and a flash memory (also referred to as an EEPROM), which is a nonvolatile memory which can be electrically written / erased. User data such as screen data created by the user is stored. 25A is a ROM in which a system program is stored,
26 is a DRAM, and 27 is a state of the touch panel 23.
A key gate array for storing in the AM 26 (hereinafter, referred to as a key gate array)
Key G / A), and all or part of the surface of the touch panel 23 has changed from being pressed to being released, or from being released to being being pressed. Is determined, and the state of the touch panel after the change is stored. Reference numeral 28 denotes a personal computer interface (hereinafter referred to as a personal computer I / O) for communicating with a personal computer.
F), and 29 is a PCI / F for communicating with a PC.

[0005] In the personal computer 3, reference numeral 31 denotes a CPU;
Is a personal computer monitor device I for communicating with the monitor device.
/ F, 33 is a memory for storing programs and screen data operated on the personal computer, 34 is a CRT, and 35 is a keyboard.

FIG. 8 is a functional block diagram of the monitor system shown in FIG. In PC1, 101
Is a monitor device I / F function for exchanging data with the PCI / F function 201 of the monitor device 2A, and 102 is P
This is a device value area set on the memory 13 of C1.

In the monitor device 2A, reference numeral 201 denotes a PC1.
Is a PCI I / F function for exchanging data with the monitor I / F function 101 of the device 26. The device value data sent from the PC 1 is stored in the device value area 20 in the DRAM 26.
Stored in 2. 203 is a monitor I / F of the personal computer 3
A personal computer I for exchanging data with the function 301
/ F function, stores the screen data sent from the personal computer 3 in the screen data area 204, and stores the device or the like described in the screen data in the device registration area 20.
Register to 5. Reference numeral 206 denotes a device value from the PC 1 stored in the device value area 202 and a screen data area 2
CRT 22 based on the screen data stored in
A display function 207 displays a screen on the touch panel. A touch panel reading function 207 reads the state of the surface of the touch panel 23 and stores the state in the touch panel state registration area 208 in the DRAM 26.
A step 09 examines the position where the state changed from being pressed on the surface of the touch panel 23 to the released state and the position where the state changed from the released state to the pressed state based on the touch panel state registration area 208. DRA based on
This is a touch panel ON / OFF reading function for registering a device operation described in the device registration area 205 in the M26 in the device value writing area 210 in the DRAM 26.

In the personal computer device 3, reference numeral 301 denotes a monitor device I / F function for exchanging data with the personal computer I / F function 203 of the monitor device 2A.
3 transmits the screen data stored in the screen data area 302 to the monitor device. A screen setting function 303 creates screen data based on an input from the keyboard 35 and stores the screen data in the screen data area 302.

The general operation of the monitor system will be described with reference to FIG. The device values of the control target device and the like held by the PC 1 are determined by the monitor device I / F function 101, P
The information is stored in the device value area 202 via the CI / F function 201. In the personal computer 3, the C of the monitor device 2A is
Screen data to be displayed on the RT22 screen is input by the keyboard 35, and the screen data is stored in the screen data area 204 and the device is stored in the device registration area 205 via the monitor I / F function 301 and the personal computer I / F function 203. Is done. The display function 206 of the monitor device 2A displays a screen on the CRT 22 based on data stored in the device value area 202 and the screen data area 204, respectively.

On the other hand, by operating the touch panel 23 based on the screen information displayed on the CRT 22 screen, the touch panel reading function 207
3 is stored in the touch panel status registration area 208, and the status is stored in the touch panel ON / OFF reading function 209.
The device operation described in the device registration area 205 is registered in the device value writing area 210 based on a predetermined change.

FIG. 9 shows the CPU 21 of the monitor device 1.
FIG. 2A is a diagram illustrating a state of a memory space in which a state of the touch panel 23 is stored. In FIG. 9, reference numeral 261 denotes a key G / A
Reference numeral 27 denotes a memory space for storing the state of the touch panel 23, which is secured in a touch panel state registration area 208 in the DRAM 26. Specifically, the position where the touch panel 23 is pressed is stored as “1”, and the released position is stored as “0” in the first memory space 261 at the same position as the key arrangement of the touch panel 23. 262, 263, 2
Reference numeral 64 denotes a memory space for the CPU 21A to store the state of the touch panel stored in the first memory space 261 by the key G / A 27, and is reserved in the DRAM 26.
In this example, this memory space is three.

The key G / A 27 sends an interrupt signal to the CPU 21A every time the state of the touch panel 23 changes,
The state of the touch panel is stored in the first memory space 261. The CPU 21A receives the interrupt signal of the key G / A 27 and updates the information of the touch panel stored in the first memory space 261 every time the key G / A 27 stores the state of the touch panel in the first memory space 261.
2, 263, and 264 are stored in this order. The CPU 21A
The pressed position and the released position of the touch panel 23 are examined in the order of the second memory spaces 262, 263, and 264.

Next, the operation will be described with reference to the flowchart of FIG. Note that the flow of FIG. 10 corresponds to a state in which all or part of the surface of the touch panel 23 changes from a pressed state to a released state, or a state in which the released state is pressed. It starts by changing. As shown in FIG. 9A, the worker touches the surface of the touch panel 23 (third from the left and one from the top).
Key G / A 27 stores the information in the first memory space 261 (step S21).
An interrupt signal for notifying that the state of the touch panel 23 has changed is output to the PU 21A. CPU 21A
Then, upon receiving the interrupt signal, the first memory space 261
Is stored in the second memory space 262 (step S22), and the process proceeds to step S23. In step S23, the CPU 21A checks the second memory space 262 (for example, moves the position of interest in order from the upper left to the lower right, and checks whether the information of the position is "1" or "0"). Accordingly, it is detected that the third and the first from the left of the touch panel surface are pressed and that the other places are released.

After that, as shown in FIG. 9B, when the operator releases his / her hand from the surface of the touch panel 23, the key G / A 27 stores the information (information in which nothing is pressed on the surface of the touch panel) in the first memory space 261. To memorize. Then, the CPU 21A stores the information stored in the first memory space 261 in the next memory space 263. CPU 21A
Detects that the touch panel surface is not pressed by examining the memory space 263.

Next, the operation of the monitor device accompanying the operation of the touch panel will be described. When a predetermined position on the touch panel 23 is pressed, the CPU 21A forcibly sets the device operation corresponding to the position and the pressed operation in the device registration area 205 from the pressed position on the touch panel 23, for example, the device of the PC1. The operation such as performing is registered in the device value writing area 210. Then, when the touch panel is released, the CPU 21A executes a device operation corresponding to the position and the released operation described in the device registration area 205 from the position where the touch panel is released, for example, an operation of forcibly resetting the device of the PC3. Register in the writing area 210.

[0016]

In the conventional monitor system as described above, for example, even if the change from the state of FIG. 9A to the state of FIG. The state of the touch panel is detected, and an interrupt signal accompanying the change is sent to the CPU 21A.
21A detects a change in the touch panel by examining the memory space. Here, since a person presses the touch panel with a finger, especially when a resistive thin film type is used for the touch panel, the touch panel is in a delicate state where it cannot be distinguished between the pressed state and the released state. When the touch panel is pressed, the pressed state and the released state are repeated within a short time. Since the touch panel ON / OFF reading function 209 operates each time the state of the touch panel changes, the monitor device performs an operation as if the hand was released from the touch panel even if the operator did not intentionally release the hand from the touch panel. The problem of doing
That is, chattering occurs.

The present invention has been made to solve such a problem, and has as its object to suppress chattering. It is another object of the present invention to suppress chattering and to reliably detect a press on the touch panel.

[0018]

According to the present invention, there is provided an input control means for detecting an input change of a touch panel, storing a state after the change in a first memory space, and outputting an interrupt signal indicating the change of the touch panel input; For each interrupt signal from the input control means, the state of the touch panel is stored from the first memory space to a predetermined second memory space, and the input position of the touch panel is determined by examining the second memory space. Detection control means for detecting, in the touch panel control device, wherein the detection control means,
Each time an interrupt signal is input from the input control means, the information stored in the second memory space by the previous interrupt signal is added to the information in the first memory space based on the newly generated interrupt signal. , In the second memory space.

Further, a plurality of second memory spaces are provided, and are sequentially stored in the second memory space, which is different every time an interrupt signal is generated.

The time from the previous interrupt signal to the newly generated interrupt signal is measured, and if this time exceeds a predetermined time, the information stored by the previous interrupt signal is newly added to the current time. The information is not added to the information in the second memory space based on the generated interrupt signal.

Further, a predetermined time changing means is provided for changing a predetermined time for comparing with a time from a previous interrupt signal to a newly generated interrupt signal.

Further, the touch panel control method according to the present invention includes a step of detecting a change in the input of the touch panel, storing the changed state in the first memory space, and a method of controlling the current touch panel stored in the first memory space. Adding a previous touch panel state to the state and storing the state from the first memory space to the second memory space; and detecting an input change of the touch panel based on information stored in the second memory space; It is provided with.

In addition, an input change of the touch panel is detected.
Storing the changed state in the first memory space and outputting an interrupt signal indicating a change in touch panel input;
A count is started for each interrupt signal, and by comparing this count value with a predetermined value set in advance, when the count value exceeds the predetermined value, the touch panel stored in the first memory space is displayed. The state is stored in the second memory space, and when the count value is equal to or less than the predetermined value, the state of the previous touch panel is added to the state of the current touch panel stored in the first memory space, and the first memory space is added. To a second memory space, and a step of detecting an input change of the touch panel based on the information stored in the second memory space.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram of a monitor device according to the present invention. In the figure,
Reference numeral 1 denotes a PC for controlling a device to be controlled such as a robot or a numerical controller, and 2 denotes a device value of an input / output device sent from the PC 1 or sends a device value to the PC 1 to forcibly set the device value. A monitor device that performs
Reference numeral 3 denotes a personal computer that creates screen data to be displayed on the monitor device 2.

In the PC 1, 11 is a CPU, 12 is a monitor I / F for communicating with the monitor 2, and 13 is a system program / sequence program / PC of the PC 1.
This is a memory for storing device values and the like.

In the monitor device 2, reference numeral 21 denotes a ROM 25
The CPU is an arithmetic processing unit that executes a program stored in the CPU, and has a touch panel reading function and a touch panel ON / OFF reading function as detection control means and functions. Reference numeral 22 denotes a CRT as a display device equipped with a touch panel 23, and 24 denotes a flash memory which is a nonvolatile memory which can be electrically written / erased.
User data such as screen brightness / buzzer volume / screen data created by the user is stored. Reference numeral 25 denotes a ROM in which a system program is stored; 26, a DRAM; 27, a key G / A as input control means for storing the state of the touch panel 23 in the DRAM 26;
Determines whether all or part of the surface has changed from the pressed state to the released state, or from the released state to the pressed state, and the state of the touch panel after the change And outputs an interrupt signal indicating a touch panel input change. 28 is a personal computer I / F for communicating with a personal computer, and 29 is a PCI I / F for communicating with a PC.

In the personal computer 3, 31 is a CPU, 32
Is a personal computer monitor device I for communicating with the monitor device.
/ F, 33 is a memory for storing programs and screen data operated on the personal computer, 34 is a CRT, and 35 is a keyboard.

FIGS. 2 and 3 are views showing a state of a memory space in which the CPU 21 stores the state of the touch panel.
2A, 2B, 3A, and 3B show states in which the touch panel 23 is pressed in a time series. In the figure, reference numeral 21 denotes a CPU, 23 denotes a touch panel, and 27 denotes a touch panel 23 in which all or a part of the surface is pressed from a pressed state to a released state or from a released state. Each time the state of the touch panel 23 changes, the state of the touch panel after the change is stored.
Is a key G / A for notifying a change in input via the touch panel 23 by outputting an interrupt signal to the key G / A.

261 is a key G / A 27 is a touch panel 2
In the first memory space provided in the DRAM 26 for storing the state of the touch panel 3, for example, the position where the touch panel 23 is pressed is "1" and the position where the touch panel 23 is released is "0", and the key arrangement of the touch panel 23 It corresponds to the same position as. 262, 263, and 264 indicate the state of the touch panel 23 stored in the first memory space 261 by the key G / A 27 as C.
This is a second memory space in which an area is secured in the DRAM 26 for storing the PU 21. In the present embodiment, the second memory space will be described as three.

The CPU 21 receives the interrupt signal of the key G / A 27 and updates the information of the touch panel 23 stored in the first memory space 261 each time the key G / A 27 stores the state of the touch panel in the first memory space 261. Are stored in the order of the second memory spaces 262, 263, and 264, and the pressed position and the released position of the touch panel are examined in the order of the second memory spaces 262, 263, and 264.

Next, the operation of the key G / A 27 in the monitor device shown in FIG. 4 will be described with reference to the flowchart. All or part of the surface of the touch panel changes from a pressed state to a released state, or by a change from a released state to a pressed state,
The flow of FIG. 4 is started. As shown in FIG.
By operating the touch panel 23 based on the screen information displayed on the screen and pressing only the third left and the first top of the touch panel surface (step S1), in step S2, the key G is pressed. / A27 stores the pressed position of the touch panel as “1” and the released position as “0” in the first memory space 261 at the same position as the key arrangement of the touch panel 23, and in step S3, Outputs an interrupt signal. Key G
/ A27 continuously executes the flowchart shown in FIG. 4 and outputs an interrupt command to the CPU 21 every time the touch panel 23 changes.

Next, a description will be given with reference to an operation flowchart of the CPU 21 shown in FIG. The CPU 21 always detects the presence or absence of an interrupt command from the key G / A 27 (step S11). If there is an interrupt command, the CPU 21 directly copies the contents of the first memory space 261 to the second memory space 262 in step S12. And the first memory space 2
The same contents as those in 61 are created in the second memory space 262 accessible by the CPU 21, and counting is started by a predetermined counter or the like (step S13).

In step S14, the CPU 21 examines the second memory space 262 (for example, moves the position of interest sequentially from upper left to lower right, and the information of the position is "1").
, Or “0”) to detect that the third and first from the left of the touch panel surface are pressed and that the other places are released. A predetermined process corresponding to the position where the touch panel surface is pressed is executed, and the process proceeds to step S15.

In step S15, for example, 40 m
It is determined whether or not there is an interrupt command from the key G / A 27 to the CPU 21 for a predetermined time of sec whether or not there is a change in the state of the touch panel. If there is a change in the state of the touch panel within the predetermined time, the process proceeds to step S16. If not, the process proceeds to step S19.

In step S16, the CPU 21 adds the contents newly written in the first memory space 261 within a predetermined time to the second memory space 2 immediately before detecting the interrupt command.
The information stored in 62 is added and stored in the CPU memory space 263, and the predetermined time is counted again in step S27.

For example, when the pressed position of the touch panel 23 changes from the state of FIG. 2A to the state of FIG. 2B within a predetermined time, the third leftmost position on the touch panel surface stored in the second memory space 262 is assumed. In addition, the fact that only the first key from the top is pressed is added to the information that only the sixth key from the left and the third key from the top of the touch panel surface detected by the key G / A 27 are newly pressed, As shown in the CPU memory space 263, 3
First and first from top, and sixth from left and 3 from top
“1” is stored in a position indicating that the eye is being pressed (see FIG. 2B).

Then, in step S18, the CPU 2
1 inspects the CPU memory space 263 to detect that the third touch from the left and the first touch from the top and the sixth touch from the left and the third touch from the top of the touch panel surface are detected. A predetermined process corresponding to the position where the touch panel surface is pressed is executed.

If the state of FIG. 2B changes within a predetermined time from the state of FIG. 3B to a state in which none of the touch panels 23 is pressed, as shown in FIG. The fact that the third and first from the top and the sixth from the left and the third from the top are pressed indicates that all of the first memory space 261 is “0”.
Of the CPU memory space 264 even though the touch panel 23 is not pressed.
, “1” is stored at a position indicating that the third and first from the left and the first from the top and the sixth and the third from the left from the top of the touch panel surface are pressed ( See FIG. 3a). That is, the touch panel 23 is chattered.
Even if the pressing of the front surface is no longer detected, the state of the CPU memory space 263 immediately before is maintained within a predetermined time, so the third position from the left and the first position from the top of the touch panel surface and the left position from the left. It is not detected that the sixth and the third from the top are no longer pressed.

If there is no input from the surface of the touch panel 23 within a predetermined time from the state of FIG. 3A to the state of FIG. 3B, the process proceeds to step S19 and the information of the first memory space 261 stored in the key G / A 27 "0") is stored in the second memory space 262, and in step S20, the CPU 21 checks that the entire touch panel surface is not pressed by examining the second memory space 262, and terminates a series of processing. I do.

According to the present embodiment, the CPU 21 starts counting in response to an interrupt signal from the key G / A 27, and for about 40 msec, which is generally the time when chattering occurs, a new key is used. Even if there is an interruption from the G / A 27, the state of the touch panel immediately before is maintained, so that chattering in which ON / OFF is repeated within a predetermined time can be prevented, and
The information on the newly touched touch panel (see FIG. 2B)
Detection is performed reliably, and the reliability of touch panel control is improved. When chattering is to be prevented, only the state of the touch panel that has been released within a predetermined time is ignored, so that the touch panel operation time, such as the need to keep pressing the touch panel for a predetermined time to prevent chattering, may be affected. There is no.

Embodiment 2 In the second embodiment, by pressing a predetermined portion of the touch panel 23, the predetermined time for waiting for a change in the state of the touch panel can be made variable. A predetermined time change button is provided at the first and first position from the top, and only when the predetermined time change button is pressed, the predetermined time is changed from 40 msec to 8 for example.
It is changed to 0 msec. FIG. 6 shows an operation flowchart of the CPU 21 in the present embodiment, and the operation of the present embodiment will be described with reference to this flowchart.

The operation of the key G / A 27 detects a change in the state of the touch panel, stores the state of the touch panel in the first memory space 261, and issues an interrupt command to the CPU 21, similarly to the operation in FIG. 4 described above. .

The CPU 21 always detects the presence or absence of an interrupt command from the key G / A 27 (step S21). If there is an interrupt command, the CPU 21 transfers the contents of the first memory space 261 to the second memory space 262 in step S22. A process such as direct copy is performed, and the same contents as in the first memory space 261 are stored in C
It is created in the second memory space 262 accessible by the PU 21 and starts counting by a predetermined counter or the like (step S23).

In step S24, the CPU 21 detects the pressed position on the touch panel surface by examining the second memory space 262, and, for example, moves the touch panel surface to the first position from the left and the first position from the top. After confirming that the provided predetermined time change button has been pressed, in step S25, the predetermined time for waiting for a change in the state of the touch panel is changed from 40 msec to 80 msec. That is, it is checked whether the first information from the left and the first information from the top of the CPU memory space is “0” or “1”. When the information is “0”, the predetermined time is 40 msec. The time is changed to 80 msec, and the predetermined time for determining the presence or absence of the interrupt command is changed in step S26.

In step S26, it is determined whether or not there is a change in the state of the touch panel for a predetermined time based on whether or not there is an interrupt command from the key G / A 27 to the CPU 21. The process proceeds to S27, and if not, proceeds to step S30.

In step S27, the CPU 21 adds the contents newly written in the first memory space 261 within a predetermined time to the second memory space 2 immediately before detecting the interrupt command.
62, adding the stored information to the CPU memory space 2
At step S28, a predetermined time is counted again.

Then, in step S29, the CPU 2
1 executes a predetermined process corresponding to the pressed position on the touch panel surface by examining the CPU memory space.

If there is no interrupt command within a predetermined time in step S26, the key G /
The information of the first memory space 261 stored in A27 is
Stored in the memory space 262, and in step S31, the CP
U21 performs processing corresponding to the pressed position on the touch panel surface by examining the second memory space 262, and ends a series of processing.

According to the present embodiment, the touch panel 23
By pressing the predetermined time change button provided in the predetermined area, the predetermined time can be easily changed, and when the response time of the operation when releasing the touch panel is desired to be as short as possible, the predetermined time is shortened, or When it is desired to suppress chattering of the touch panel as much as possible, the operation characteristics of the touch panel can be easily changed by increasing the predetermined time.

[0050]

According to the present invention, chattering can be prevented without affecting the response time of the operation when the touch panel is pressed, and the pressed information can be reliably detected. Further, since a predetermined time for detecting the touch panel is provided, only the necessary information can be detected without the information on the touch panel being pressed indefinitely remaining in the past, and the reliability of the touch panel detection is improved. Further, by making the predetermined time variable, the characteristics of the operation of the touch panel can be changed, and the usability is improved.

[Brief description of the drawings]

FIG. 1 is a hardware block diagram illustrating a hardware configuration of a monitor system according to the present invention.

FIG. 2 is a state diagram showing a state of a memory space in the monitor device.

FIG. 3 is a state diagram showing a state of a memory space in the monitor device.

FIG. 4 is an operation flowchart of a key G / A in the monitor device.

FIG. 5 is an operation flowchart of a CPU in the monitor device.

FIG. 6 is an operation flowchart of a CPU in the monitor device.

FIG. 7 is a hardware block diagram showing a hardware configuration of a conventional monitor system.

FIG. 8 is a functional block diagram of a conventional monitor system.

FIG. 9 is a diagram showing a state of a memory space for storing a state of the touch panel in the monitor device.

FIG. 10 is a flowchart showing the operation of the monitor device.

[Explanation of symbols]

2 monitor device, 21 CPU, 23 touch panel,
26 DRAM, 27 key G / A.

Claims (6)

[Claims] 1. An input control means for detecting an input change of a touch panel, storing a state after the change in a first memory space, and outputting an interrupt signal indicating a touch panel input change, and an interrupt signal from the input control means. Detection control means for storing the state of the touch panel from the first memory space to a predetermined second memory space, and detecting the input position of the touch panel by examining the second memory space. In the touch panel control device provided, the detection control means newly generates information stored in the second memory space by a previous interrupt signal each time an interrupt signal is input from the input control means. A touch panel control device characterized by adding information to a first memory space based on an interrupt signal and storing the information in the second memory space. 2. The touch panel control device according to claim 1, wherein a plurality of second memory spaces are provided, and the plurality of second memory spaces are sequentially stored in the different second memory spaces each time an interrupt signal is generated. 3. The time from a previous interrupt signal to a newly generated interrupt signal is measured, and when this time exceeds a predetermined time, information stored by the previous interrupt signal is newly added to the current time. Second based on the generated interrupt signal
3. The touch panel control device according to claim 1, wherein the touch panel control device does not add information to the memory space. 4. The touch panel control according to claim 3, further comprising a predetermined time changing means for changing a predetermined time for comparing with a time from a previous interrupt signal to a newly generated interrupt signal. apparatus. 5. A step of detecting an input change of the touch panel and storing a state after the change in the first memory space, and adding a previous touch panel state to the current touch panel state stored in the first memory space. A control method for a touch panel, comprising: a step of storing from a first memory space to a second memory space; and a step of detecting an input change of the touch panel based on information stored in the second memory space. 6. A step of detecting an input change of the touch panel, storing the changed state in the first memory space, and outputting an interrupt signal indicating the change of the touch panel input, and starting counting for each of the interrupt signals. By comparing the count value with a predetermined value set in advance, when the count value exceeds the predetermined value, the state of the touch panel stored in the first memory space is stored in a second memory space, When the count value is equal to or less than the predetermined value, a step of adding the state of the previous touch panel to the state of the current touch panel stored in the first memory space and storing the state from the first memory space to the second memory space; Detecting a change in the input of the touch panel based on information stored in the second memory space.