Realizing method of scroll ball

Abstract

The invention discloses a realizing method of a scroll ball, which comprises the following steps: obtaining the level change of GPIO after the XOR operation of the former-read GPIO value and current GPIO value of a universal input / output interface is executed; judging the current operation direction of the scroll ball according to the level change of GPIO. Being compatible with the structure of the prior hardware, the invention can avoid false triggering and overcome the adverse influence caused by the false triggering.

Description

technical field [0001] The invention relates to the realization technology of the rolling ball, in particular to a method for realizing the rolling ball in the embedded field and the event field with frequent false triggering events and few regularities. Background technique [0002] Although the rolling ball is a new product among embedded consumer electronics products, it is more and more favored by users because it is flexible, convenient and fast, and takes into account the dual advantages of mouse and keyboard. The rolling ball is composed of a big ball Ball and four small ball Rollers, so we usually roll the rolling ball is actually rolling the Ball, when the Ball rolls, it drives the Roller in its direction to roll, and the rolling of the Roller will trigger its corresponding Huo The Er element generates pulses through the general-purpose input / output interface GPIO, which will produce corresponding changes in the registers related to the rolling ball. Here, register...

AI Technical Summary

Problems solved by technology

At present, from the perspective of improving the hardware structure, it is still impossible to filter out false trigger pulses, so that it is impossible to solve the adverse effects caused by false triggers. , or to the right, or even an upward pulse

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