Key identification method and system of matrix keyboard

Abstract

The invention provides a key identification method and system of a matrix keyboard. The method comprises the steps that after the keyboard is powered on, a main control chip of the keyboard enters a low-power-consumption mode; after keys are pressed down, rows and columns where the keys are located are triggered and connected; row IO generates a level sudden change signal, and the level sudden change signal awakens the main control chip through input IO and triggers IO interruption; and the main control chip positions the key position to obtain a key trigger signal, carries out jitter detection on the key trigger signal to judge whether the key trigger signal is effectively triggered or not, if so, the key action of the key position is taken as a key identification result, otherwise, the key identification fails, and the main control chip enters a low-power-consumption mode. According to the invention, the multi-key awakening detection of the matrix can be realized under the conditionsof ultra-low power consumption and insufficient IO interruption, and the identification of the combined key is supported.

Description

technical field [0001] The invention relates to the field of embedded development, and in particular to an anti-shake method and system for a matrix keyboard. Background technique [0002] Common button structure circuits are divided into independent buttons and determinant buttons. Independent buttons mean that each button occupies one I / O line, and the I / O port is directly used to form a single button circuit, but it takes up more ports and is only suitable for A small number of applications. The determinant keyboard I / O adopts the mouth line to form a row and column structure, and the keys are arranged at the intersection of the rows and columns. When there are many keys, I / O port lines can be saved. But when the number of keyboards is large, it also needs to occupy more MCU ports. Moreover, neither of these two methods can directly obtain the scan code, but must be calculated. [0003] At present, keys are the most commonly used input methods. Common key circuits inc...

AI Technical Summary

Problems solved by technology

[0008] 1. The lack of keyless scanning module and IO interrupt cannot realize the combination of keys;

[0009] 2. When the resources are insufficient, the button function cannot be realized;

[0010] 3. Most of the time the keys are in a static state without operation, and the key scanning module will consume power all the time;

[0011] 4. The combination button layout is limited by the design of the key scan module;

[0012] 5. The debounce process depends on hardware

Images