Method, apparatus and chip for implementing keyboard module composite key function

Abstract

The invention provides a method, a chip and a device for implementing the functions of compound keys of the key module of an embedded system. The method comprises the following steps: the embedded system executes keystroke interruption and records the keystroke after detecting the keystroke is pressed; the embedded system starts a timer and then rescans if other keystrokes are pressed in accordance with scheduled time intervals, if so, records the new keystrokes; the embedded system scans if all the keystrokes are released, and then disables the timer if all the keystrokes are released; then the embedded system produces the key assignments of the compound keys according to the keystroke records and submits the program prior to the keystroke interruption. The timer is additionally arrangedin the system on the basis of the existing array keystroke module. The system starts the timer and then rescans and records other keystrokes in accordance with the scheduled time intervals after detecting a keystroke interruption. Therefore, under the condition of one system interrupted, the invention can realize the functions of the compound keys by obtaining the responding of a plurality of keystrokes. Besides, the proposal of the invention has no restriction to the keystroke sequence and quantity, and supports the composite of any keystroke and a plurality of keystrokes.

Description

technical field [0001] The invention relates to the keyboard module technology of an embedded system, in particular to a method, a device and a chip for realizing the compound key function of the keyboard module of the embedded system. Background technique [0002] Embedded system is the minimum simplified system based on practical application. Compared with personal computer (PC, Personal Computer), most of the functions completed by embedded system are relatively single and fixed, and the resources that can be used are relatively few. In order to reduce the occupation of input / output (I / O) interface resources, its keyboard module usually uses an array keyboard, using a mode in which several keys share one interrupt resource, or even all keys share one interrupt resource. [0003] Such as figure 1 As shown, in the prior art, the array keyboard module consists of a keyboard matrix with row lines and column lines, a switch coupled to the row lines, an interrupt generator cou...

AI Technical Summary

Problems solved by technology

However, in this technical mode, when a key is pressed, another key cannot be interrupted when another key is pressed, so the composite key function cannot be supported.

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