KR20100080953A - Method for transmitting and receiving data of wireless keyboard and its protocol - Google Patents

Abstract

PURPOSE: A method for transmitting and receiving wireless keyboard data and a protocol thereof are provided to uniformly maintain battery consumption regardless of a modulation type. CONSTITUTION: Keyboard data is wirelessly transmitted using a protocol(S50~S52). The keyboard data includes fixed data, variable data, and inverted data corresponding to key input. The protocol has a data structure which includes the fixed data, the variable data, and the inverted data of the variable data. The fixed data comprises a leader. The variable data comprises a special bit, a make/break bit, and a key code.

Description

Wireless keyboard data transmission and reception method and its protocol {METHOD FOR TRANSMITTING AND RECEIVING DATA OF WIRELESS KEYBOARD, AND ITS PROTOCOL}

1 is a schematic block diagram of a conventional wireless keyboard.

2 is a format diagram of data according to a system scan code transmission method of a conventional wireless keyboard.

3 is a block diagram of a wireless keyboard data transmission apparatus for carrying out the present invention.

4 is a flowchart showing a method for transmitting wireless keyboard data according to the present invention.

5 is a format diagram of wireless keyboard data according to the present invention.

6 is a block diagram of a wireless keyboard data receiving apparatus for carrying out the present invention.

7 is a flowchart showing a method for receiving wireless keyboard data according to the present invention.

Explanation of symbols on the main parts of the drawings

31: power supply section 32: key matrix

33: main transmission control unit 34: wireless transmission unit

61: wireless receiving unit 62: main receiving control unit

63: transmission status display unit 70: host computer

The present invention relates to a wireless keyboard data transmission and reception method and a protocol thereof. In particular, based on the new protocol, inverted data of the variation data together with the variation data that changes according to the input key except for the fixed data is inverted. By providing data, it is not necessary to allocate bits for checksum separately, and it is possible to accurately identify data errors, to keep the battery consumption constant regardless of the modulation method, and to provide data size (DATA). The present invention relates to a wireless keyboard data transmission and reception method and a protocol for adding a separate function key without increasing the size.

In general, in the communication protocol of wireless keyboards such as IR (InfraRed) or RF (Radio Frequency), there are 4PPM method, PWM method and simple PULSE method which are currently used the most, including PWM method (including simple PULSE method). ) Has the disadvantage that the battery consumption is not constant because the data size (DATA SIZE) changes according to the code of the data. In order to solve this problem, 4PPM method can be used. In the protocol using 4PPM method, special bits corresponding to each special function key that are frequently used to prevent transmission error of the special function key of the keyboard are used. By sending this special bit at the same time when key data is transmitted, even if a data transmission error occurs during data transmission, it compensates for the transmission error by giving information of the function key being pressed and released when the next pressed key data is transmitted. However, since the function key data field is allocated as many as the number of function keys, the data size increases as the bit corresponding to the data field increases whenever the function key is expanded. In addition, a method of preventing a transmission error by assigning a separate checksum code may be used.

FIG. 1 is a schematic block diagram of a conventional wireless keyboard. Referring to FIG. 1, a conventional wireless keyboard 1 is composed of a microprocessor 11, a key matrix 13, and a transmitter 15, in which the micro The processor 11 searches for the pressed key among the keys of the key matrix 13 by applying the scanning signal to the key matrix 13 and transmits the corresponding system scan code to the personal computer 3 through the transmitter 15.

FIG. 2 is a format diagram of data according to a system scan code transmission method of a conventional wireless keyboard. Referring to FIG. 2, when a plurality of conventional personal computers 3 and a wireless keyboard 1 are connected, channel ID data is stored. The area for is allocated. In addition, when separate keys for windows are configured on the keyboard, a window key flag area for these keys is allocated. That is, as shown in FIG. 2, the conventional system scan codes are composed of a total of 32 bits, that is, a total of 4 bytes (B1, B2, B3, B4), and the system scan codes are 5 in the first first byte B1. The bits (bit7, bit6, bit5, bit4, bit3) correspond to the IDs of the keyboards of the keyboard 1.

The ID information is information for identifying the mouse since a mouse or a remote controller may be used as an input means. In this case, the eighth bit (bit7) will be a reader for notifying transmission of data. As described above, the remaining three bits (bit2, bit1, bit0) in the first byte B1 are assigned system scan data corresponding to the window keys. In this case, the first and second bits bit0 and bit1 are allocated to the fourth bit bit3 indicating whether the two keys for the window are pressed, respectively.

The next second byte B2 is system scan codes indicating that the function conversion key is pressed. As shown, the eighth bit bit7 has function conversion keys allocated for make and break flags and the remaining first The seventh bit (bit 0 -bit 6) is allocated for the function change keys as shown.

The next third byte B3 is assigned a normal key data, i.e., a system scan code assigned to each key. Here, the third byte B3 is in a state in which the keys include the make and break codes as described above.

A channel ID is assigned to the fifth to eighth bits b4-b7 of the next fourth byte B4, and these system scan codes are generated during transmission during the first to fourth bits b0-b3. Check sum information has been assigned that allows you to check the current class. In this case, when a plurality of wireless keyboards are used, the channel ID is channel information for determining from which keyboard the data transmitted from the keyboard is transmitted. Therefore, the channel ID may be deleted if necessary.

On the other hand, when a user actually combines a function key and a general key, one function key and one general key are combined, respectively, rather than the "2 + 1" method or the "3 + 1" method, which combines two function keys and one general key. By using most of the "1 + 1" method to be used, the method of allocating a special bit for each function key, as in the conventional art, decreases the efficiency because the data size increases when the function key is added, and the function key is continuously added in the future. In this case, there is a problem that the data field must be continuously increased.

In order to solve this problem, we propose a wireless keyboard data transmission and reception method based on a new transmission protocol (PROTOCOL).

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is based on a new protocol, and the inverted data of the variation data together with the variation data depending on the input key except for the fixed data. wireless keyboard data transmission and reception method, and a protocol thereof.

Another object of the present invention is to provide a wireless keyboard data transmission and reception method and a protocol thereof, which do not need to separately allocate bits for a checksum and can accurately identify data errors.

In addition, another object of the present invention is to maintain a constant battery consumption irrespective of the modulation scheme, wireless keyboard data transmission and reception method to add a separate function key without increasing the data size (DATA SIZE) And to provide that protocol.

As a technical means for achieving the above object of the present invention, a first aspect of the present invention is a method for generating data in a data wireless transmitter and transmitting data wirelessly to a wireless receiver, comprising fixed data and variation data. By using a protocol having a data structure including the inverted data of the variation data, keyboard data including fixed data, variation data, and inverted data corresponding to key input are wirelessly transmitted.

In addition, a second aspect of the present invention provides a method for wirelessly receiving data transmitted by a data wireless transmission unit in a wireless receiving unit, comprising: a data structure including fixed data and variation data and including inverted data of the variation data. By using the protocol having, the keyboard data including fixed data, change data and inverted data is received.

In addition, a third aspect of the present invention is a protocol for generating data in a data wireless transmitter and transmitting data wirelessly to a wireless receiver, including fixed data and variation data, and including inverted data of the variation data. It has a data structure.

In addition, the first to third features of the present invention may be combined to be implemented as another feature.

Hereinafter, a wireless keyboard data transmission and reception method according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram of a wireless keyboard data transmitter for carrying out the present invention. Referring to FIG. 3, a wireless keyboard data transmitter for carrying out the present invention includes a power supply unit 31 for supplying power required for the keyboard; A key matrix 32 for inputting a key press selection and a power supply from the power supply unit 31 are operated to recognize the key press selection and release of the key matrix 32 to wirelessly transmit data corresponding thereto. And a main transmission control unit 33 for controlling transmission, and a wireless transmission unit 34 for converting data into radio signals and transmitting them wirelessly under the control of the main transmission control unit 33. According to the control of the main transmission control unit 33, the wireless keyboard data transmission process according to the present invention is performed as follows.

4 is a flowchart illustrating a wireless keyboard data transmission method according to the present invention. Referring to FIG. 4, a data wireless transmission unit generates data and wirelessly transmits data to a wireless reception unit. As follows.

The wireless keyboard data transmission method according to the present invention uses a protocol having a data structure including fixed data and variation data and inverted data of the variation data, and includes fixed data, variation data, and inverter corresponding to a key input. Sends keyboard data, including filled data.

The fixed data includes a reader, the variation data includes special bits, make / break bits, and key codes, and the inverted data includes inverted data for each of the special bits, make / break bits, and key codes. . In this case, the reader includes information indicating that the keyboard data is included, and may further include ID information according to the applied product or the use environment.

The keyboard data to be received includes first to third bytes, the first byte comprising a reader, a special bit, and an inverted bit of the special bit, and the second byte includes a make / break bit, a key code Wherein the third byte includes inverted data of the second byte.

In addition, the special bit and the inverted bit of the special bit may be composed of a plurality of bits, but most preferably, each bit is composed of one bit.

First, in the step (S41-S45) of generating the first byte, when the key is input, the first byte B1 including the reader L of the fixed bit and the special bit SP having the function conversion information is generated. The first byte B1 may include an inverted bit of a special bit. The reader L is a fixed bit that informs the keyboard data and generates a first byte B1 including the reader L and the special bit SP as shown in FIG. 5.

The first byte B1 includes an inverted bit (-SP) of a special bit for checking a transmission error of the special bit (SP), and the special bit and the inverted bit of the special bit are keyboard data. In consideration of the size of D, it is preferable to allocate each bit.

Herein, the special bit SP is set when the function conversion key is made and cleared when the function conversion key is broken.

In the generating of the second byte (S46-S48), a make / break bit (M / B) and a key code KD corresponding to the make / break bit (M / B) state are generated. Generates a second byte B2 comprising a make / break bit (M / B) and a key data (KD), which sets the make / break bit (M / B) when the keypress is selected When the release is released, the make / break bit M / B is cleared, and a second byte B2 including the make / break bit M / B and the key data KD is generated, and the generated second One byte B1 and the second byte B2 may be stored in a buffer before transmission.

In the generating of the third byte (S49-S51), the third byte B3, which is the inverted data of the second byte B2, is generated, and the first process of this step checks whether data is being transmitted, In the second process, when it is not transmitting, inverted data of the make / break bit (M / B) and the key data (KD) of the second byte (B2) stored in the buffer is taken. In the process, a third byte B3 including the make / break bit (-M / B) and the key data (-KD), which are the inverted data, is generated.

Next, in the step (S52-S53) of transmitting the keyboard data, the keyboard data including the generated first-third bytes (B1, B2, B3) is converted into a wireless signal and transmitted. A parity bit (P) can be added to each byte to be transmitted, and a start bit (ST) and an end bit (STP) can be distinguished to distinguish each byte included in the keyboard data before and after each byte to be transmitted. You can add

The converting of the data into a wireless signal may be performed by converting the keyboard data including the generated plurality of bytes into a wireless signal of a packet unit.

5 is a format diagram of wireless keyboard data according to the present invention, wherein the data of the present invention includes a first byte (B1), a second byte (B2), and a third byte (B3), each of which is a start bit. (ST), parity bits (P), and termination bits (STP) in common. The first byte B1 includes a reader L, a special bit SP, and an inverted bit (-SP) of the special bit, and the second byte B2 includes a make / break bit (M / B), Key data KD, and the third byte B3 is a value obtained by taking a plurality of make / break bits M / B and key data KD of the second byte B2, that is, -M Include / B and -KD.

As described above, by using the second byte and the third byte included in the data of the present invention, it is not necessary to allocate a separate checksum code.

In addition, the data including the first byte B1, the second byte B2, and the third byte B3 as described above may be converted into a wireless signal, for example, an IR signal or an RF signal, and transmitted wirelessly. .

6 is a configuration diagram of a wireless keyboard data receiving apparatus for carrying out the present invention. Referring to FIG. 6, the wireless keyboard data receiving apparatus for carrying out the present invention includes a wireless receiving unit for wirelessly receiving data transmitted wirelessly ( 61, a transmission state for displaying a data transmission state under the control of the main reception control unit 62 and the main reception control unit 62 for controlling an operation corresponding to the data received by the wireless reception unit 61; The display unit 63 is included. According to the control of the main reception control unit 62, the wireless keyboard data reception process of the present invention is performed.

Hereinafter, a method for receiving wireless keyboard data according to the present invention will be described.

FIG. 7 is a flowchart illustrating a method for receiving wireless keyboard data according to the present invention. Referring to FIG. 7, the wireless receiver performing the present invention wirelessly receives data transmitted from a data wireless transmitter, which will be described in detail. Is as follows.

The wireless keyboard data receiving method according to the present invention includes fixed data and variation data, and includes fixed data, variation data and inverted data using a protocol having a data structure including the inverted data of the variation data. Receive keyboard data.

The fixed data of the received data includes a reader, the variation data includes a special bit, a make / break bit, and a key code, and the inverted data includes an invert for each of the special bit, make / break bit, and key code. Contains graded data. In particular, the special bit and the inverted bit of the special bit each consist of 1 bit.

The received keyboard data includes first to third bytes, the first byte includes a reader, a special bit, and an inverted bit of the special bit, and the second byte includes a make / break bit, a key code Wherein the third byte includes inverted data of the second byte.

First, in the step of receiving keyboard data (S71-S73), data including the first byte B1, the second byte B2, and the third byte B3 is wirelessly received. In the first step of this step, the received radio signal is restored to the original keyboard data, and in the second step, the first to third bytes included in the restored data are replaced with the start bit (ST) and the end bit. (STP), respectively, and then, in the third process, it is determined whether the data is based on the reader L of the first byte B1. In the fourth process, in the case of the corresponding data, keyboard data including the first byte B1, the second byte B2, and the third byte B3 is received.

In operation S74, the transmission error is checked on the basis of the second byte B2 and the third byte B3 of the keyboard data. Specifically, the transmission error is checked. In this case, the transmission error of each byte is checked using the parity bit (P) in each byte included in the keyboard data. In the second process, the inverted data of the second byte (B2) is stored in the third byte (B3). Check for a transmission error whether or not it is equal to. In the third process, if there is a transmission error in the first process and the second process, the received keyboard data is discarded. If there is no transmission error, the process proceeds to the next step.

In operation S75, it is determined whether a make or a break is based on the make / break bit M / B included in the second byte B2 of the received data. When the make / break bit (M / B) of 2 bytes B2 is set, it is determined as a make, and when the make / break bit is cleared, it is determined as a break.

In the case of making a make code (S77a to S77c), in case of make, it is determined whether it is a function conversion key based on the special bit SP included in the first byte B1. After the (SP) is set, a make code is generated. In this step, when the special bit SP of the second byte B2 is set, it is recognized as a function conversion key, and when the special bit is cleared, it is recognized as a general key. .

Next, in the step (S76a-S76c) of generating a break code, in the case of a break, it is determined whether the function is a function conversion key based on the special bit included in the first byte. A break code is generated, which is recognized as a function conversion key when the special bit of the second byte is set, and as a general key when the special bit is cleared.

Finally, in the processing of the corresponding operation according to the data code (S78-81), the corresponding operation is processed according to the special bit, the make code, the break code, and the data code. And temporarily storing the make code and the break code generated in each step of generating the break code in a buffer, and then processing the command of the host if there is a host command, and, if there is no host command, the special bit, the make code, or Process the operation according to the break code and data code.

As described above, the present invention does not use the conventional 4PPM, it is possible to keep the battery consumption constant by using any modulation method, and the data size is not changed even if the function key is continuously extended We propose a new communication protocol that keeps constant, and according to this new protocol, allocating inverter data to the part of the data change except for the fixed bit, not only keeps battery consumption constant but also maintains the data size. Keep it constant Inverted data exists for each data, so it is possible to accurately read the error status of the data without the need for a separate checksum, and even if the function conversion key is expanded by giving only one bit of the function conversion key. The advantage is that the size does not change in the future.

According to the present invention as described above, on the basis of the new protocol, by providing the inverted data of the variation data with the variation data depending on the input key except the fixed data, a checksum is provided. There is no need to allocate a separate bit for data, it is possible to check the data error accurately, to keep the battery consumption constant regardless of the modulation method, and to use a separate function key without increasing the data size. The present invention relates to a wireless keyboard data transmission and reception method that can be added.

The above description is only a description of specific embodiments of the present invention, and the present invention is not limited to these specific embodiments, and various changes and modifications of the configuration are possible from the above-described specific embodiments of the present invention. It will be apparent to those skilled in the art to which the present invention pertains.

Claims (24)

A method of generating data in a data wireless transmitter and wirelessly transmitting data to a wireless receiver, Wireless transmission of keyboard data including fixed data, change data and inverted data corresponding to key inputs, using a protocol having a data structure including fixed data and change data and including inverted data of the change data Wireless keyboard data transmission method, characterized in that. The method of claim 1, wherein the fixed data includes a reader, The variation data includes a special bit, a make / break bit and a key code, And the inverted data includes inverted data of a special bit, a make / break bit, and a key code. The method of claim 2, wherein the inverted bits of the special bits and special bits are Wireless keyboard data transmission method, characterized in that each consisting of 1 bit. The method of claim 3, Generating a first byte comprising a fixed bit reader and a special bit having function conversion information when a key is input; Generating a make / break bit and a key code corresponding to the make / break bit state and generating a second byte including the make / break bit and the key code; Generating a third byte that is the inverted data of the second byte; And Converting and transmitting the keyboard data including the generated plurality of bytes into a wireless signal; Wireless keyboard data transmission method comprising the. The method of claim 4, wherein generating the first byte A special bit is set when a function conversion key is made, and a special bit is cleared when the function conversion key is broken. The method of claim 4, wherein converting the data into a wireless signal and transmitting the data A wireless keyboard data transmission method comprising adding a start bit and an end bit before and after each byte to be transmitted. The method of claim 6, wherein converting the data into a wireless signal and transmitting the data And converting the keyboard data including the generated plurality of bytes into a wireless signal in a packet unit and transmitting the converted keyboard data. In the method for wirelessly receiving data transmitted from the data wireless transmission unit in the wireless receiving unit, Receiving keyboard data including fixed data, variation data, and inverted data by using a protocol having a data structure including fixed data and variation data and including inverted data of the variation data. How to receive keyboard data. The method of claim 8, wherein the fixed data of the received data comprises a reader, The variation data includes a special bit, a make / break bit and a key code, The inverted data includes inverted data for each of a special bit, a make / break bit, and a key code. 10. The method according to claim 9, wherein the inverted bits of the special bit and the special bit are Wireless keyboard data receiving method, characterized in that each one bit. The method of claim 10, wherein the keyboard data to be received Including first to third bytes, The first byte includes a leader, a special bit, and an inverted bit of the special bit, The second byte includes a make / break bit, a key code, And said third byte comprises inverted data of said second byte. The method of claim 11, wherein the wireless keyboard data receiving method is Wirelessly receiving keyboard data comprising the first to third bytes; Checking a transmission error based on the data of the second byte and the third byte; Determining whether a make or a break is based on the make / break bit included in the second byte; In the case of a make, determining whether it is a function conversion key based on the special bit of the first byte, and in the case of a function conversion key, generating a make code after setting a special bit; Determining whether it is a function conversion key based on the special bit of the first byte, and generating a break code after clearing the special bit if it is not a function conversion key; And Processing a corresponding operation according to the special bit, make code, break code, or key code; Wireless keyboard data receiving method comprising the. 13. The method of claim 12, wherein wirelessly receiving the keyboard data Recovering the original keyboard data from the received radio signal; A second process of recognizing first to third bytes included in the restored keyboard data through the start bit and the end bit; Determining whether the data is keyboard data based on the reader of the first byte; And A fourth step of receiving keyboard data including the first to third bytes in the case of keyboard data; Wireless keyboard data receiving method comprising a. The method of claim 12, wherein the checking of the transmission error A first step of checking a transmission error of each byte using parity bits in each byte of the received keyboard data; A second step of checking a transmission error whether or not the inverted data of the second byte is equal to the third byte; A third step of discarding the received keyboard data if there is a transmission error in the first and second processes, and proceeding to the next step if there is no transmission error; Wireless keyboard data receiving method comprising a. The method of claim 12, wherein determining whether the make or the brake is And if the make / break bit of the second byte is set, determine as a make, and if the make / break bit is cleared, determine to be a break. The method of claim 12, wherein generating the make code and generating the break code And if the special bit of the second byte is set, recognizes it as a function conversion key, and if the special bit is cleared, recognizes it as a general key. A method of wirelessly transmitting and receiving data between a data wireless transmitter and a wireless receiver, Generating a first byte comprising a fixed bit reader and a special bit of one bit having functional conversion information; Generating a make / break bit and a key code corresponding to the make / break bit state and generating a second byte including the make / break bit and the key code; Generating a third byte that is the inverted data of the second byte; Converting and transmitting the keyboard data including the generated plurality of bytes into a wireless signal; Wirelessly receiving keyboard data comprising the first to third bytes; Checking for a transmission error based on the second byte and the third byte of the keyboard data; Determining whether a make or a break is based on a make / break bit included in the second byte of the keyboard data; In the case of a make, determining whether it is a function conversion key based on a special bit made of one bit included in the first byte, and in the case of a function conversion key, generating a make code after setting a special bit; In the case of a break, determining whether it is a function conversion key based on the special bit included in the first byte, and if not, generating a break code after clearing the special bit; And Processing a corresponding operation according to the special bit, make code, break code, or key code; Wireless keyboard data transmission and reception method comprising the. In the protocol for generating data in the data wireless transmission unit and transmitting data wirelessly to the wireless reception unit, And a data structure including fixed data and variation data, and including inverted data of the variation data. 19. The apparatus of claim 18, wherein the fixed data includes a reader, The variation data includes a special bit, a make / break bit and a key code, And said inverted data includes inverted data of each of a special bit, a make / break bit, and a key code. 20. The method of claim 19, wherein the inverted bits of the special bits and special bits are A wireless keyboard data transmission protocol comprising one bit each. The method of claim 20, Means for generating a first byte comprising a reader of fixed bits and a special bit having function conversion information when a key is input; Means for generating a make / break bit and a key code corresponding to the make / break bit state and generating a second byte including the make / break bit and the key code; Means for generating a third byte that is the inverted data of the second byte; And Means for converting the keyboard data including the generated plurality of bytes into a radio signal for transmission; Wireless keyboard data transmission protocol comprising a. 22. The apparatus of claim 21, wherein the means for generating the first byte is A special bit is set when a function conversion key is made, and a special bit is cleared when the function conversion key is broken. 22. The apparatus of claim 21, wherein the means for converting the data into a wireless signal and transmitting the data A wireless keyboard data transmission protocol comprising a start bit and an end bit before and after each byte to be transmitted. 24. The apparatus of claim 23, wherein the means for converting the data into a radio signal for transmission is Wireless keyboard data transmission protocol, characterized in that for converting the keyboard data including the generated plurality of bytes into a wireless signal of a packet unit.

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