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Key detecting device and method

A technology of detection equipment and detection method, which is applied in the direction of keyboard coding and dynamic coding, which can solve the problems of power consumption for key scanning and cumbersome key unlocking, and achieve the effects of avoiding misoperation, resource and power consumption, and high power consumption

Active Publication Date: 2015-01-07
FUZHOU ROCKCHIP SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] To this end, it is necessary to provide a key detection solution to solve the existing problems of power consumption for key scanning and cumbersome key unlocking.

Method used

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  • Key detecting device and method

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Embodiment Construction

[0043] In order to explain in detail the technical content, structural features, achieved goals and effects of the technical solution, the following will be described in detail in conjunction with specific embodiments and accompanying drawings.

[0044] see figure 1 , this embodiment provides a key detection device, which is used to obtain the key value of the key after detecting the voltage of the key. The button can be in the form of figure 1 The button form includes three buttons. After pressing different buttons, different voltages will be output at the button voltage output terminal. For example, the voltage corresponding to pressing the button SW1 is 0.75VCC, and the corresponding voltage to pressing the button SW2 is 0.5VCC. , the voltage corresponding to pressing the button SW3 is 0.25VCC. Then, when the detection device detects 0.25VCC, according to the corresponding relationship between the button function and the button voltage, it can be known that the button SW3...

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Abstract

The invention discloses a key detecting device and method. The key detecting device comprises a reference voltage module, a voltage comparison module, a voltage analog-to-digital conversion module and a processing module, wherein the reference voltage module is connected with the voltage comparison module and the processing module, the voltage comparison module is connected with the processing module, and the voltage analog-to-digital conversion module is connected with the processing module. According to the key detecting device and method, a part of keys which do not respond can be shielded by setting the reference voltage, the number of the part of keys which do not respond can be controlled, in this way, misoperation on keys is avoided, and resources and power consumed for reading and handling the part of keys are avoided.

Description

technical field [0001] The invention relates to the technical field of key detection, in particular to a key detection device and method. Background technique [0002] In the existing multi-key detection technology, generally, the sampling voltage of each key or combination of keys is read, and different key functions are realized according to different keys corresponding to different sampling voltages. Existing under the situation of multi-button, there are two ways that the existing situation that prevents the button from being pressed by mistake is adopted: one is to use the software to judge and identify after using the CPU to scan continuously, if the button voltage is not expected If the voltage responds, it will not respond. The problem with this method is that the CPU has to scan continuously, and after scanning, it needs to perform judgment and identification processing, which requires a certain amount of power consumption, and cannot be scanned after the CPU enters...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M11/20H03M11/02
Inventor 邱建斌
Owner FUZHOU ROCKCHIP SEMICON
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