JPH0535380A - Communication system for key signal - Google Patents

Abstract

PURPOSE:To offer the communication system of a key signal in which the processing of a task activated by a key signal receiving processing can be stopped without using key information indicating that the key of a key inputting device is detached. CONSTITUTION:While the key is pressed, the code of received data (S11) transmitted at every 10ms by a start stop synchronizing serial communication from a key inputting device side is used as a relative address, key information '1' is written in a pertinent address in a storage area (S12), and a task 2c is activated (S13). The task 2c operates a processing according to the kind of the key discriminated from the storage position of the key information of the storage area (S22), and the key information of the storage area is reset (S23). Therefore, when the key is detached, the key information is not set in the storage area, so that the processing can be stopped by the task 2c (S25).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key signal communication system between a key input device and a processing device.

[0002]

2. Description of the Related Art Key signal transmission processing on the side of a key input device is
As shown in the time chart of FIG. 4, the key type data indicating the type of the key when the key is pressed and the make signal indicating that the key is pressed are released from the key type data when the key is released. A break signal indicating that it has been transmitted is transmitted from the key input device to the processing device. When the key signal receiving process on the processing device side receives the key type data indicating that the key is pressed and the make signal, "1" is set to the location corresponding to the key type data in the storage area, and the key is pressed. Starts a task that executes processing from the time it is released until it is released. Next, in the key signal receiving process, when the key type data indicating that the key has been released and the break signal are received, the portion corresponding to the key type data in the storage area is reset (“0” is set).

The task activated by the key signal reception process executes the process related to the received data and monitors the storage area, and when the location corresponding to the key type data in the storage area is reset, the task itself is processed. Stop the execution of.

[0004]

However, in the conventional key input signal transmission method, the key type data indicating that the key is released and the break signal are received by the key signal reception process due to a transmission error. If not, the part corresponding to the key type data in the storage area is not reset by the key signal reception process,
There is an unsolved problem that the task started by the key signal reception process cannot stop the execution of the process.

Therefore, the present invention has been made by paying attention to the unsolved problem of the above-mentioned conventional example, without using the key type data and the break signal indicating that the key of the key input device has been released. The purpose of the present invention is to provide a key signal communication system in which the task started by the key signal receiving process can stop the execution of the process when the key of the key input device is released.

[0006]

In order to solve the above problems, according to the present invention, as shown in FIG. 1, a key signal from a key input device is transmitted to a processing device and is processed by the processing device. In the key signal communication method described above, a key signal transmitting unit that is provided in the key input device and that transmits a key signal at a constant cycle while a key is pressed, and the key signal that is provided in the processing device are provided. A key signal receiving means for writing to a predetermined portion of a key signal corresponding storage area of the storing means for each reception, and the storage area is reset after being read by a task started by the key signal receiving means. Is characterized by.

[0007]

The key information is written in the key signal corresponding storage area every time the key signal receiving means receives the key signal transmitted at a constant period while the key is being pressed by the key signal transmitting means. , Is reset after being read by the task started by the key signal receiving means. Therefore, when the key signal is not received after the reset, the key information does not exist, and the task that executes the process while the key information exists stops the execution of the process.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention,
2 and 3 are flowcharts of the embodiment. In FIG. 1, reference numeral 1 denotes a key input device, and when a key is pressed on the keyboard on the operation surface, the key signal is read and transmitted by the key signal transmitting means 1a. A processor 2 receives the key signal transmitted from the key signal transmitting means 1a by the key signal receiving means 2a, and writes the key information "1" in a predetermined portion of the storage means 2b corresponding to the key signal. .. The task 2c is a processing program activated by the key signal receiving means 2a. The task 2c searches the storage means 2b to perform a predetermined process for a key for which the key information "1" is set, and to store the key information. Reset.

Next, FIGS. 2 and 3 will be described. Figure 2
Is a key transmission processing program stored in the key input device and can be activated by, for example, a 10 ms timer interrupt. In step S1, the key signal from the keyboard is read. Next, in step S2, it is determined from the key signal read in step S1 whether or not a key on the keyboard is pressed. If the key is pressed, the process proceeds to step S3, and if the key is not pressed, the process returns to the main program.

In the transmission processing program of step S3,
The read key signal is transmitted as data to the processing device through the RS-232C interface by, for example, asynchronous serial communication. With this method, the program
Since it is activated every ms, the key signal is transmitted to the processing device once every 10 ms by the asynchronous serial communication while the key is pressed. The transfer rate is 1 which is the transmission cycle.
Transfer rate sufficiently high for 0 ms, eg 19.2K
bps is used.

FIG. 3 shows a key receiving processing program stored in the processing device, a task 2c processing program started by this key receiving processing program, and a storage area which is a storage means 2b for transferring key information. .. Here, the storage area which is the storage means 2b is, for example, a storage section in which one word is assigned for each type of key signal that can be addressed by using the head address of the storage area as a reference address and the code of the key signal as a relative address.

Next, if there is no transmission error, the key reception processing program is activated by an interrupt every reception.
Step S11 is a reception processing program, which extracts a key signal from the reception data sent every 10 ms by the asynchronous serial communication from the key input device while the key is being pressed by the key input device, Control goes to step S12. In step S12, the key information "1" is written in the address corresponding to the key signal in the storage area, and the process proceeds to step S13. In step S13, task 2
Start c and return to the main program. As described above, when the key is continuously pressed, the received data is sent every 10 ms, so that the key information "1" is set in the storage area every 10 ms.

Next, the processing of task 2c will be described. In step S21, the key information is read from the storage area, the type of the key is determined from the address position where the key information was stored, the process proceeds to step S22, and the process corresponding to the type of the key is executed. The content of the processing corresponding to the type of key in step S22 is outside the scope of the present invention, and thus the description thereof is omitted.

After the processing corresponding to the type of the key in step S22 is completed, the process proceeds to step S23. Step S23
Then, resetting is performed by setting "0" to the location of the read key information "1" in the storage area. As a result, the key information written in the storage area by the key reception processing program is reset by the task 2c processing program. Next, in step S24, for example, 10
Time the waiting time of 0 ms. After 100 ms has elapsed, the process proceeds to step S25, and it is determined whether or not the key information "1" is set in the storage area. If the key information "1" is set, the processing of task 2c is executed again. Then, the process returns to step S21. If the key information "1" is not set, the process directly returns to the main program and ends the processing.

In the processing of FIGS. 2 and 3, the key transmission processing program of steps S1 to S3 corresponds to the key signal transmission means, and the key reception processing program of steps S11 to S13 corresponds to the key signal reception means. Therefore,
Now, if the key "A" is pressed on the key input device, the key transmission processing program transmits the code corresponding to the key "A" as data in step S3.
On the processing device side, if there is no transmission error upon reception, an interrupt is generated, the key reception processing program is started, and the key information “1” is set to the address of the storage area obtained by using the data code as a relative address, and the task 2c Start up. Then, when the task 2c processing program is executed, the key information “1” is read from the location where the key information in the storage area is set, and after the processing relating to the input key “A” is performed in step S22. The key information in the storage area is reset. After that, the task 2c processing program waits for 100 ms, and then proceeds to step S25.
At, it is determined whether or not the key information is set in the storage area, and if it is not set, the process ends. In this way, the task 2c processing program resets the key information written in the storage area during the processing, so the processing ends even if the information indicating that the key of the key input device has been released cannot be received due to a transmission error. can do.

Next, when a key is continuously pressed on the key input device, such as a cursor key, data is transmitted from the key input device every 10 ms, and an interrupt occurs every time the processor receives the data. Therefore, the key information is written in the storage area every 10 ms, and the task 2c is executed.
To start. Therefore, the task 2c processing program is
Since it has a weight of 100 ms, the processing is continuously executed every 100 ms. Then, after the key is released, the processing of task 2c ends.

In the above embodiment, the case where RS-232C is used as the transmission interface has been described, but the present invention is not limited to this and RS-422 or RS-423 is used.
May be used. In the above embodiment, the case where the asynchronous serial communication is used as the transmission method has been described.

[0018]

As described above, according to the key signal communication system according to the present invention, the key signal receiving means for receiving the key signal at a constant period while the key is being pressed allows the predetermined location of the storage area. Since the key information written in is reset after being read by the task started by the key signal receiving means, even if the key is not released even after receiving the information that the key is released, The task that executes the process while the information is present has an effect that the execution of the process can be surely stopped.

Further, since the key signal transmitting means does not have to transmit the information indicating that the key has been released, there is an effect that the key input device can be simplified and the reliability can be expected to be improved.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment.

FIG. 2 is a flowchart of an example.

FIG. 3 is a flowchart of an example.

FIG. 4 is a time chart of a communication method of a conventional example.

[Explanation of symbols]

 1 Key input device 2 Processing device 1a Key signal transmitting means 2a Key signal receiving means

Claims (1)

Claim: What is claimed is: 1. A key signal communication system in which a key signal from a key input device is transmitted to a processing device and is received and processed by the processing device.
A key signal transmitting means for transmitting a key signal at a constant cycle while a key is pressed, and a key signal transmitting means provided in the processing device for writing each time the key signal is received are stored in a predetermined portion of a key signal corresponding storage area of the storing means. A key signal communication system, comprising: a key signal receiving unit for performing the operation, wherein the storage area is reset after being read by a task started by the key signal receiving unit.