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A key scanning method and system

The technology of a scanning system and scanning method, which is applied in the key scanning method and system field, can solve the problem of low resource utilization and achieve the effect of reducing IO resources and software resources

Active Publication Date: 2021-02-09
ZTE INTELLIGENT IOT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the key scanning technology of the prior art, there is generally a problem of low resource utilization

Method used

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  • A key scanning method and system

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Embodiment Construction

[0030] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0031] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood ...

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Abstract

The present invention provides a button scanning method and system, comprising a main control module, at least one scanning port, an IO line group, a timing pulse signal sending unit, a button scanning unit and a button reporting unit; the timing pulse signal sending unit is used to send a button Detect the required pulse signal; the button scanning unit is used to scan the pulse signal to determine the row and column values ​​of the button; the button reporting unit is used to report the touch button to the main chip when the button is pressed when the button is scanned, so as to Let the main chip process the pressed keys. The button scanning method and system of the present invention uses fewer scanning ports and scans more buttons, and at the same time reduces IO resource occupation and software resources to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of physical key scanning, and in particular relates to a key scanning method and system. Background technique [0002] The current implementation of matrix keyboard scanning software generally adopts the row-column wiring method. That is, the IO lines are arranged in rows and columns, and each intersection is connected to a key. If there are 20 IO lines connected in 4 rows x 5 columns, there will be 20 intersection points, and a maximum of 20 keys can be identified. But there are only 9 IO ports actually used. [0003] Specifically, it includes three methods: row scanning method, row and column inversion method, and row and column scanning method. [0004] The working principle of the row scanning method is: the CPU first outputs low level to all rows, and if no key is pressed, all column lines output high level. If a key is pressed, the column where the key is located is short-circuited with the low lev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M11/20
CPCH03M11/20
Inventor 杨金喜马涛
Owner ZTE INTELLIGENT IOT TECH