Method for transmitting data of wireless keyboard having track-ball
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorJi Sung Lee
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Abstract
A method for transmitting data of a wireless keyboard device having a track-ball, which transmits track-ball data and keyboard data more effectively, and thereby simplifies the process and reduces the current consumption of the keyboard device. The data transmission method transmits a leader signal composed of five chips including three consecutive low signals followed by a high signal and a low signal, thereafter transmits data that contains track-ball data and keyboard scan data recorded in the same data format, and, instead of check-sum code, allocates the complementary value of the code value of the third byte (Byte3) into the fourth byte (Byte4) and transmits it so that the transmission error can be checked by simply comparing the third byte and the fourth byte.
Claims6
A method for transmitting data of wireless keyboard having a track-ball, comprising the steps of:
- transmitting a leader signal composed of five chips including three consecutive low signals followed by a high signal and a low signal;
- transmitting a first byte that is allocated a device code that indicates whether the data is keyboard data or track-ball data and a user ID that identifies the present user consecutively after transmitting the leader signal;
- transmitting second and third bytes that are allocated the values of X,Y position variations of the track-ball in the case of track-ball data transmission, or allocated the values of special key data and key position codes in case of keyboard data transmission;
- and
- transmitting a fourth byte that is allocated a check-sum code to check transmission error.
A method for transmitting data of wireless keyboard having track-ball comprising the steps of:
- transmitting a leader signal composed of five chips including three consecutive low signals followed by a high signal and a low signal;
- transmitting a first byte that is allocated a device code that indicates whether the data is keyboard data or track-ball data consecutively after transmission of said leader signal;
- transmitting second and third bytes that are allocated the values of X,Y position variations of the track-ball in case of track-ball data transmission, or allocated the values of special key data and key position codes in case of keyboard data transmission;
- and,
- transmitting a fourth byte that is allocated the complementary value of a scanned key code or a track-ball position code, instead of an extra calculated check-sum code.
Dependencies are inferred from the claim text.