KR19980034104A - Wireless keyboard system scan data transmission and reception method of personal computer - Google Patents

Abstract

The present invention relates to a method for transmitting / receiving a code of a wireless key board wirelessly communicating with a personal computer. The wireless key board of the present invention saves the power required to transmit a channel ID by transmitting a combination of an assigned channel ID and a system scan code. The personal computer may decode the received wireless keyboard code with the channel ID to decode the original system scan code.

Therefore, the present invention has the effect that it is possible to save the power required to transmit the channel ID in the wireless keyboard.

Description

How to send / receive scan data of wireless keyboard system of personal computer

The present invention relates to a wireless key board used in a personal computer, and more particularly, to a method for transmitting and receiving a channel ID of a wireless key board.

As an input device of a personal computer, a keyboard connected to a computer by a wire is commonly used. However, as can be seen in US Patent Publication No. 4,628,541, a personal computer that can be used as a wireless keyboard can be used due to the emergence of a communication device using an infrared signal. Is being developed.

These keyboards have a built-in microprocessor, which constantly scans the keys on the keyboard to see which key is pressed, and if there is a key pressed, finds the code corresponding to the pressed key and sends it to the computer. The microcomputer checks whether there is a key pressed in this way, and a scan is called. The code that the microprocessor recognizes through the scan is called a keyboard scan code.

In other words, the code that the microprocessor recognizes through the scan is called the keyboard scan code, and the microprocessor receives the keyboard scan code and converts it into a code to be sent to a computer. The converted code is called a system scan code.

On the other hand, a plurality of wireless keyboards may be used simultaneously as an input device in one personal computer, and in this case, the personal computer needs to know from which wireless key board the received system scan code is transmitted. To this end, conventionally, a method of adding a channel ID in a system scan code is used. That is, each wireless keyboard is assigned a unique channel ID, and by sending this channel ID along with the system scan code to the personal computer, the personal computer can determine from which wireless keyboard the system scan code received as the channel ID was transmitted. You can see.

However, a problem arises in that the method of transmitting the channel ID thus increases the wireless keyboard power consumption. That is, the wireless keyboard is configured to receive the power consumption from its own battery, etc. As described above, in order to transmit the channel ID in addition to the system scan code, a separate power consumption occurs. There was a problem that the power consumption is increased than not.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a method for transmitting and receiving a system scan code of a wireless keyboard capable of transmitting a channel ID without power consumption.

Another object of the present invention is to provide a method for transmitting and receiving a system scan code of a wireless keyboard capable of detecting a channel ID from a code of a received wireless keyboard.

The method for transmitting a system scan code of a wireless key board according to the present invention is a method of transmitting a system scan code corresponding to a pressed key of a key matrix in a wireless key board wirelessly connected to a personal computer, and applies a scanning signal to the key matrix. Making a step; Detecting a corresponding system scan code if there is a pressed key among the keys of the key matrix; Combining a channel ID with the system scan code; Assigning a check sum code to the combined code and transmitting it to the personal computer.

The present invention also provides a method for receiving a code signal transmitted from a wireless key board, comprising: decoding a system scan code by combining a received code and a predetermined channel ID; Checking whether an error occurs as a checksum bit of the decoded system scan code; And if the check resulted in no error, performing an operation corresponding to the received system scan code.

1 is a schematic block diagram of a wireless key board according to the present invention;

2 is a flowchart of a system scan code transmission / reception method of a wireless key board according to the present invention.

3 is a schematic block diagram of a personal computer according to the present invention;

4 is a flowchart of a system scan code transmission / reception method of a wireless key board according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: wireless key board 2: personal computer

11: Microprocessor 13: Key Metrics

15: transmitter 21: receiver

3: processor 25: output device

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic block diagram of a wireless key board according to the present invention, in which the key board 1 is composed of a microprocessor 11, a key matrix 13, and a transmitter 15.

In this configuration, the microprocessor 11 searches for the pressed key among the keys of the key matrix 13 (S2) by applying the scanning signal to the key matrix 13 as shown in the flowchart of FIG. 2 (S2) and the corresponding system scan code. Is detected (S3).

Here, a separate channel ID is mounted in the microprocessor 11, and the channel ID is combined with the system scan code to form a new transmission system scan code (S4). That is, a new transmission system scan code is formed by combining the channel ID with the system scan code, and this transmission scan code can be decoded into the original system scan code by the channel ID. For example, if the exclusive ID of the channel ID and the system scan code is exclusive-OR, the exclusive system scan code is decoded when the exclusive ID of the channel ID and the system scan code are exclusive.

After combining the channel ID and the system scan code in this way, check sum information is allocated to enable these codes to check for errors occurring during transmission (S5) and then to the personal computer through the transmission unit 15. The transmission is wireless (S6).

Accordingly, it can be seen that the wireless key board of the present invention does not transmit a separate channel ID as in the related art, thereby saving power required for transmitting the channel ID.

3 shows a schematic block diagram of a personal computer 2 for receiving a code from a wireless key board.

As shown in the figure, the personal computer 2 includes a receiver 21 for receiving the code of the wireless key board, a processor 23 for processing the code of the receiver 21, and a result processed by the processor 23. The output device 25, such as a monitor to output, is comprised.

In the personal computer configured as described above, a channel ID identical to the channel ID of the above-described wireless keyboard is stored in the processor 23, and a predetermined code is received in the receiver 21 as in step S7 of the flowchart shown in FIG. Is received, the received code and channel ID are combined (by mutually exclusive misunderstanding in the above-mentioned example, so that the received code and channel ID are again exclusively misunderstood) (S8) to decode the system scan code of the wireless keyboard. . If an error has not occurred (S9) by checking whether an error has occurred as a checksum bit allocated to the decoded system scan code (S10), an operation corresponding to the received system scan code is performed (S11). In this case, when an error occurs as a result of performing steps S9 and S10, there may be two cases in which an error occurs due to noise in a transmission process or an error occurs due to a different channel ID. In this case, the operation is not performed. Therefore, the result is the same.

That is, the wireless keyboard of the present invention can save the power required to transmit the channel ID by combining the assigned channel ID and the system scan code, and the personal computer recombines the code of the received wireless keyboard with the channel ID. To decode the original system scan code.

Therefore, the present invention has the effect that it is possible to save the power required to transmit the channel ID in the wireless keyboard.

Claims (4)

As a method of transmitting a system scan code corresponding to a pressed key of the key matrix 13 in a wireless key board wirelessly connected to a personal computer, Applying a scanning signal to the key matrix (S1); Detecting a corresponding system scan code if there is a pressed key among the keys of the key matrix (S2, S3); Associating a predetermined channel ID with the system scan code (S4); And assigning a check sum code to said combined code and transmitting it to said personal computer (S5, S6). The method of claim 1, And said channel ID and system scan code are exclusive or favorite wireless computer system scan data transmission / reception methods. A method of receiving a code signal transmitted from a wireless key board, Decoding a system scan code by combining the received code and a predetermined channel ID when a predetermined code is received (S7, S8); Checking whether an error occurs as a checksum bit of the decoded system scan code (S9, S10); And performing an operation corresponding to the received system scan code if an error has not occurred as a result of the checking (S11). The method of claim 1, And said received code and channel ID are exclusive orphan wireless computer system scan data transmission / reception methods.