A scanning positioning method of a keyboard

Abstract

A keyboard scanning positioning method includes initializing a keyboard, waiting a keyboard scanning sampling time, taking samples and reading current state key values, judging whether the key state is stable, combining the current state key values to be a current state state code, timing the current keyboard state maintaining time, checking a state code table to obtain state numbers and key numbers, determining the key numbers according to the state numbers and the keyboard state maintaining time, processing the key numbers and the like. According to the keyboard scanning positioning method, keyboard operation and keyboard states are converted to the state code to be stored in the table, the key numbers are obtained in a mode of checking the state number table, and effective operations are performed after single key operation, combined key operation and keyboard state maintaining for a period in the same method. The size of the state code table is simply needed to be increased or decreased or the key numbers corresponding to the state numbers in the state number table are simply needed to be adjusted when the key operation function is increased or decreased or adjusted.

Description

technical field [0001] The invention relates to a scanning and positioning method for a keyboard, in particular to a scanning and positioning method for a matrix keyboard. Background technique [0002] With the continuous development of embedded technology, various electronic products generally use microcontrollers as the control core, and keyboards as the main input device, which have been widely used. [0003] The invention patent with the application number CN201010153560.2 "A Quick Scanning and Positioning Method for a Matrix Keyboard" adopts the method of keyboard interrupt triggering to enter the scanning and positioning process of the keyboard, and uses the method of repeating the keyboard scanning steps several times to determine whether the keys are valid, and The state of the obtained key value is judged; if the state of multiple sampling is the same, it is in a stable state, and the key value is valid; if the state of multiple sampling is different, the key value ...

AI Technical Summary

Problems solved by technology

However, the single-key operation and the combined key operation of the method need to be processed separately; the keyboard operation function of effective operation is not performed after the keyboard state is maintained for a period of time; when increasing or decreasing the key operation function or adjusting the key operation function, it is necessary to modify the keyboard scan Locate program structure

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