Multi-button detection device and detection method

Abstract

The invention relates to a multi-button detection device and a detection method; a controller uses each test port to respectively output high level to buttons of the corresponding line, controls each acquisition port to be grounded through a corresponding inner pull down resistor and in a pull down state, and detects column signals outputted by buttons of the corresponding column and received by the acquisition ports; the controller detects the column signals to be greater than 0 voltage, keeps the acquisition ports with column signal greater than 0 voltage to be in the pull down state, controls test ports to output high level line by line, respectively detects column signals outputted by the buttons of the corresponding column and received by the pull down acquisition ports again, and obtains a button detection result according to the repeatedly received column signals. The method and device can combine tests port with acquisition ports so as to scan the button module; the controller can control the corresponding acquisition ports to be in the pull down state when column signals are received, thus preventing conflictions formed by simultaneously triggering buttons of different columns from affecting the signal detection, preventing mal-trigger phenomenon, and reducing detection cost.

Description

technical field [0001] The invention relates to the technical field of key detection, in particular to a multi-key detection device and detection method. Background technique [0002] With the rapid development of technology, key-type input devices are widely used in electronic products. There are three common button detection methods: independent trigger button, scan button and A / D button. Each button of the independent button occupies one I / O resource, and the application with a large number of buttons requires too much I / O resources of the controller. The scan button and the A / D button can use less I / O resources to design an application circuit with a large number of buttons. However, both methods have button conflicts, that is, when multiple buttons are pressed at the same time, errors will occur. trigger phenomenon. [0003] In order to avoid false triggering, the traditional multi-key detection method is to connect a diode in series with each key of the scanning key...

AI Technical Summary

Problems solved by technology

Due to the need to use a large number of diodes, the traditional multi-button detection method has the disadvantage of high detection cost

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