JPS6235934A - Automatic scan type keyboard input control system - Google Patents

Abstract

PURPOSE:To perform a key input adapted to a processing contents by providing the first mode where a key code is sent at every key depression and the second mode where the on/off information of all keys are sent collectively. CONSTITUTION:In accordance with a request from an application processing part, a mode instruction part 22 sets the first input mode, which instructs that the code of a depressed key on a keyboard should be sent at every key depression, or the second input mode, which instructs that the on/off information of all keys should be detected by automatic scanning and be sent collectively to a control register 19 and transmits it to a keyboard input device 10. A mode discriminating part 16 discriminates this mode classification, and a key depression detecting part 17 is started to perform the input in a conventional manner if the first mode is set, and a scan output part 18 is started to output the scan results of all keys to a processor 12 if the second mode is set.

Description

[Detailed Description of the Invention] [Summary] Codes related to keys pressed on a keyboard are
There is a first mode that instructs what should be sent each time a key is pressed, and a second mode that instructs that on/off information regarding all keys is detected by automatic scanning and sent all at once. By giving mode instructions from the main body processing device to the keyboard input device, key input can be performed in the same way as before, and the single main body processing device can detect the on/off status of all keys at once. This paper discloses an automatic scanning keyboard input control method that enables automatic scanning.

[Industrial application field]

The present invention relates to a keyboard input control system, and more particularly to an automatic scanning type keyboard input control system that allows a two-body processing device to detect the on/off states of all keys at once.

[Conventional technology and problems]

Conventionally, when a main body processing device that processes data inputs data from a keyboard input device, the keystroke triggers two inputs.
For example, the code of the pressed key was received by an interrupt. According to such an interrupt method, there is a problem in that it is difficult for the nine-body system processing device to recognize the state in which a plurality of keys are turned on/off at the same time. That is.

In order for the main body processing unit to grasp the on/off status of all keys, it must use an interrupt when a key is turned on.
In addition to receiving and memorizing the key code, even if the key code is turned off, an interrupt will be generated to
It is necessary for the nine-body processing device to receive the code and manage the on/off storage information. Processing this for all keys is extremely burdensome.

Another possible method is to have a single main body processing device send a scan signal directly to the keypad to check the on/off status of the entire key, but this would also place a processing burden on the main body processing device. The problem is that it's big.

For example, for a game or the like, if a specific image on the GraphInk screen does not move due to input from the keyboard, the three-body processing device may need to know which keys are pressed at the same time. . In this case, it is desirable to be able to quickly and easily grasp the pressing status of all keys.

Furthermore, if a two-body processing device can distinguish between multiple keys that are pressed at the same time, even if there are only a small number of keys, a large amount of information can be obtained from a small number of keys. It is thought that various uses will become possible.

[Means for solving problems]

FIG. 1 is a block diagram showing the basic configuration of the present invention.

In FIG. 1, 510 is a keyboard input device.

11 is an interface unit between the keyboard input device 10 and the main body processing device; 12 is a main body processing device that processes data according to key input; 13 is a scan code register that supplies a scan signal; and 14 is a matrix-like keypad.
A key matrix consisting of a switch, 15 is an input control unit that scans the key matrix 14 and controls sending information regarding the output to the main body processing device 12 side, 16 determines the input mode instructed by the main body processing device 12 17 is activated in the first mode and detects key presses; 18 is activated in the second mode and sequentially sends scan signals regarding all keys. and a scanning output section that outputs on/off information for all keys.

19 is a control register that provides control information to the keyboard input device 10; 20 is a data register in which data to be output to the main body processing device is set; 21 is a reception process that receives input data from the keyboard input device 10; 22 is a mode instruction section for instructing the input mode to the keyboard input device 10; 23 is the keyboard input device 1;
Represents an input cover that stores input data from 0.

The mode instruction section 22 receives a request from an application processing section (not shown) in the seven-body system processing device 12.

The code related to the key pressed on the keyboard,
Either the first mode instructs to send out each keystroke, or the second mode in which on/off information for all keys is detected by automatic scanning and instructs to send out all at once. The input mode is stored in the control register 19 and transmitted to the keyboard input device 10. The mode determining unit I6 determines this mode type.

If the first mode is instructed, the keystroke detection section 17 is activated and the same input as the conventional one is performed. Second
When the above mode is instructed, the scanning output unit 18 is activated, and the scanning results regarding all keys are sequentially outputted to the main body system processing device 12 side.

[Effect]

If the first mode is specified.

When the key is turned on from off, the reception processing unit 21 is activated by one interrupt, and the code of the key that has been turned on is notified to the reception processing unit 21 via the data register 20. On the other hand, when the second mode is designated, the scanning output section 18 is activated, all keys are scanned, and the on/off information is notified to the reception processing section 21. Therefore, the two-body system processing device 12 can perform key input suitable for the processing content depending on the mode.

〔Example〕

FIG. 2 is a time chart of an embodiment of the present invention, FIG. 3 is a diagram explaining the processing of the mode instruction section, FIG. 4 is a diagram explaining the control of the input control section, and FIG. 5 is a diagram explaining the processing of the reception processing section. .

The control register 19 is provided with two, for example, a mode bit indicating the mode type, a start bit instructing to start scanning in the second mode, and a ready bit indicating that data can be received. Further, the data register 20 is provided with a data ready bit indicating that input data is prepared by the keyboard input device 10 and nine, for example, seven data bits.

As shown in Figure 2, when the mode bit is off, the first
A second mode is indicated when the mode bit is on. And ready bit and data ready
Handshaking between the nine-body system processing device 12 and the keyboard input device 10 is performed using the bits. In the case of the first mode.

The pressed key code is sent as data. In the second mode, when the start bit is turned on, the scanning output section 18 starts operating.1For example, assuming that there are 128 types of keys from 0th to 127th, for each key On/off information is sent out sequentially. Note that handshaking may be performed between ready and data ready for each bit of data, or it may be determined that handshaking is performed in 1, for example, 7 bits in parallel in order to improve transfer efficiency. Main body processing device 1
No. 2 can acquire on/off information for all keys at once, and there is no need to perform interrupt processing for each individual key, so it is possible to quickly grasp the key press status.

The mode instruction section 22 shown in FIG. 1 performs three processes, for example, as shown in FIG. 3. The following process numbers ■ to ■ correspond to the process numbers shown in FIG. 3.

(2) Determine whether the first mode or the second mode is specified by a command from the application processing unit.

■ If the first mode is specified, write “0” to the mode bit of the control register 19.

■ If the second mode is specified, write "l" to the mode bit of control register 19.

The input control section 15 shown in FIG. 1 uses a microprocessor 9, for example, to perform processing control as shown in FIG. 4. The following process numbers - [phase] correspond to the process numbers shown in FIG.

■ The mode determination unit 16 turns on/off the mode bit.
Determine off. When it is off, move on to process ■. When it is on, the scanning output unit 18 performs the second mode of processing starting from process (1).

■ Determine whether the ready bit in the control register 19 is on or off. When off, control is returned to process ■.

■ Detect keystrokes. Therefore, the scan code corresponding to each key is sequentially set in the scan code register 13, the scan signal is sent to the key matrix 14,
The key memory (which stores its output and the previous key state)
(not shown). Then, when the key changes from off to on, it is determined that a key has been pressed.

(2) When a keystroke is detected, the scan code is set in the data register 20 as a keystroke code.

■ At the same time, turn on the data ready of the data register 20.

- The main body processor 12 receives the key code and waits for the ready bit in the control'in register 19 to turn off.

■ If the ready bit turns off, immediately turn off the data ready and return control to processing.

■ If no new key is pressed, so-called tiebamatic processing is executed. That is, the last key pressed is checked, and if it is detected that the same key has been pressed continuously for a predetermined period of time or more, a process is executed to send that key code. After that, control is returned to process (2).

■ If the mode bit is on and the second mode is specified, monitor the star 1-- bits of control register 19. If the start bit is on, proceed to process [phase].

[Phase] Set the scan code to “0”.

■ Set the scan code in the scan code register 13 and send the key matrix 14 hescan signal.

@ The ready bit in the control register 19 is monitored, and if the ready bit is cleared, the process moves to process 0.

0 Set the output signal of the key matrix 14 to the data register 20.

■ Along with data settings, turn on data ready.

[Phase] Waits for main body processor 12 to receive data and turn off the ready bit in control register 19.

[Phase] Turn off data ready.

Add 1 to the O scan code.

[Phase] Determine whether the scan code has reached 128. If it has not reached 128, control is returned to process 0 and the process is repeated in the same manner. If the number reaches 128, the automatic scanning is ended and control is returned to process (2).

The reception processing section 21 shown in FIG. 1 executes processing as shown in FIG. 5, for example. The following process numbers - [phase] correspond to the process numbers shown in FIG.

■ Determine whether there is a reception request from the application processing unit,
If there is no reception request, wait for a reception request.

(2) If there is a reception request, it is determined whether the current mode is the first mode or the second mode. In the second mode,
Transfer control to processing ■.

■ In the case of the first mode, the same input processing as before is performed.

Therefore, first, the ready bit of the control register 19 is turned on.

■ Wait for data ready to turn on and 1 interrupt to occur.

■ When data ready is turned on, read the data in the data register 20.

■ Turn off the ready bit of t#li wholesale register 19.

(2) Set the read data, ie, the code of the pressed key, in the input buffer 23, and return control to process (2).

■ For a reception request in the second mode, turn on the start bit in the control register 19.

■ Initialize the code counter to “O”.

[Phase] Turns on the ready bit and indicates that reception is possible.

■ Wait for Data Ready to turn on.

@ When data ready turns on, read the on/off information data.

0 Turn off the ready bit.

■ Set the read data to the input cover sofa 23.

Alternatively, for example, processing such as saving the contents of the code counter in the case where it is turned on to the input buffer 23 is executed.

■ Add 1 to the code counter.

[Phase] If the code counter is smaller than 128, control is returned to the process [Phase] and secondary data is input. When the number reaches 128, one input is completed and control is returned to process (2).

In the above embodiment, in the second mode, when the start bit of the control register 19 is turned on, automatic scanning in the keyboard input device 10 is started, and handshaking is performed.

Sends on/off information for all keys. For example, when the mode focus of the control unit register 19 is off and the start bit is on, that state is set to the third mode, and a change in the key state is triggered.

It is also possible to implement the present invention by providing another mode in which on/off information for all keys is sent by generating an interrupt in the main body processing device 12 and similarly transmitting the on/off information of all keys by handshaking.

In addition, the one-body system processing device 12 does not receive and receive on/off information of all keys by a program, but one, for example, DM.
Keyboard input device 1 is transferred directly to the main memory by A transfer.
Receive data from 0.

It is also possible to implement the process in a manner that further reduces the processing load.

[Effects of the Invention] As explained above, according to the present invention, a five-body processing device can be used without the one-body processing device directly sending a scan signal to the key matrix.

It becomes possible to quickly and easily identify a plurality of keys pressed at the same time. In addition, key inputs using interrupts as in the past are also possible, making it possible to easily select the most suitable key input depending on the content of the process.

[Brief explanation of drawings]

Fig. 1 is a basic configuration diagram of the present invention, Fig. 2 is a time chart of an embodiment of the present invention, Fig. 3 is an explanatory diagram of processing of the mode instruction section, Fig. 4 is an explanatory diagram of control of the input control section, and Fig. 5 The figure is a process explanatory diagram of the reception processing section. In the figure, 10 is a keyboard input device, 11 is an interface section, 12 is a main body processing device, 13 is a scan code register, and 14 is a key matrix. 15 is an input control section, 16 is a mode discrimination section, 17 is a keystroke detection section, 18 is a scanning output section, 19 is a control register, 2
0 represents a data register, 21 represents a reception processing section, 22 represents a mode instruction section, and 23 represents an input sofa.

Claims (1)

[Claims] A keyboard input device comprising a main body processing device (12) that processes data, and a control section (15) that supplies a scan signal to a key matrix (14) and controls key input from the keyboard. (10) Instructs the main body processing device (12) side to send at least a pressed key code to the keyboard input device (10) side. a first mode;
means (22) for notifying a mode type regarding a second mode instructing that on/off information regarding all keys should be sent; and determining the notified mode type on the keyboard input device (10) side; means (16) for detecting a key, and detecting a key press when the first mode is indicated as a result of the determination by the discriminating means (16), and transmitting a key code corresponding to the pressed key; When the second mode is indicated as a result of the determination by the determining means (17) and the determining means (16), the key matrix (
14), means (18) for sequentially outputting scan signals regarding all keys and transmitting on/off information regarding all keys from the keyboard input device (10) side to the main body system processing device (12) side; An automatic scanning type keyboard input control method characterized by: