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Keyboard scanning system

A keyboard scanning and keyboard technology, applied in dynamic coding and other directions, can solve the problems of high cost and low utilization efficiency of input and output interface resources, and achieve the effect of improving efficiency

Active Publication Date: 2016-03-23
JIANGSU HUITONG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are problems of low utilization efficiency and high cost of the input and output interface resources of the MCU in the key expansion carried out by the above scheme.

Method used

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Embodiment Construction

[0018] At present, a slave MCU is used to scan part of the keys on the keyboard, and the main MCU is responsible for the rest of the key scans and controls the scan of the keys from the MCU, and the slave MCU sends the result of the key scan to the main MCU. The main MCU is made to process all key scanning results to confirm which key is pressed on the keyboard. However, the button expansion performed by the above solution has the problems of low utilization efficiency of the input and output interface resources of the MCU and high cost.

[0019] In order to solve the above-mentioned problems, the embodiment of the present invention provides a keyboard scanning system. Compared with the existing keyboard scanning system, two MCUs independently scan rows or columns, which can maximize the use of input and output interfaces. Therefore, in the same Under the condition of a large number of input and output interfaces, the number of buttons that can be scanned is more, that is, the...

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Abstract

The invention discloses a keyboard scanning system. The system comprises an MCU (Microcontroller Unit) and a level turner, wherein the MCU is suitable for setting the rows / columns of a keyboard as a first level which is a high level or a low level, controlling the level turner to turn the columns / rows of the keyboard to a second level opposite to the first level, closing a detected interrupt signal, determining the row / column position of the second level in the rows / columns, further determing the column / row position by controlling the level turner to turn correspondingly, and determining a pressed key by referring to boththe row / column position and the column / row position; and the level turner is coupled with the columns / rows of the keyboard, and is suitable for triggering the turning of the column / row level of the keyboard according to the control of the MCU. By adopting the solution, the utilization efficiency of input and output interface resources of the MCU can be improved, and the cost can be reduced.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a keyboard scanning system. Background technique [0002] With the development of electronic technology, existing smart devices will have many peripherals, such as printers, keyboards, etc., but the input and output interface resources of the Microcontroller Unit (MCU) inside the smart device are limited, so the key on the keyboard In the case of an increase, the problem of key scanning expansion needs to be solved urgently. [0003] At present, a slave MCU is used to scan part of the keys on the keyboard, and the main MCU is responsible for the rest of the key scans and controls the scan of the keys from the MCU, and the slave MCU sends the result of the key scan to the main MCU. The main MCU is made to process all key scanning results to confirm which key is pressed on the keyboard. [0004] However, the button expansion performed by the above solution has the problems of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M11/20
CPCH03M11/20
Inventor 乔磊龙涛滕敏肖彦果
Owner JIANGSU HUITONG GRP