Key automatic expansion structure and method

Abstract

The invention discloses a key automatic expansion structure and method. The key automatic expansion structure comprises a single-chip microcomputer, a key main board and at least one key expansion board; the key main board is sequentially connected in series with the parallel-to-serial conversion chips of the plurality of key expansion boards; and the single-chip microcomputer is connected with the parallel-to-serial conversion chip of the key main board through a 555 timer and is provided with a detection program. According to the method, the number of 1 and the position of 0 other than a terminal frame within a scanning frame are detected, so that the number and positions of keys are judged, and are compared with the scanning records of the detection program; and a user is prompted whenan abnormality appears. According to the key automatic expansion structure and method of the invention, the automatic expansion of keys can be realized through a simple circuit; due to the fact that the cost of the key expansion boards is low, modular key expansion is realized through the cascading mode of the key expansion boards, meanwhile, when the key expansion boards are increased, the numbers and positions of the keys can be automatically detected under a condition that the program is not required to be modified; and therefore, the workload and cost of key expansion are reduced.

Description

technical field [0001] The invention relates to the field of buttons, in particular to a button automatic expansion structure and a method thereof. Background technique [0002] The existing button expansion processing mode is as follows: first determine how many buttons the product needs, and the specific position of each button (that is, determine what function each button corresponds to), and then write the corresponding program. When the number of keys is changed or the position of the keys is adjusted, the program needs to be rewritten. Therefore, this mode is only suitable for stable products and small changes. Once the product changes frequently, the existing key expansion processing mode will cause a lot of workload. , reduce the development efficiency, and the process of changing the program may introduce new BUG, ​​which requires retesting, resulting in an increase in costs. Contents of the invention [0003] The object of the present invention is to provide a k...

AI Technical Summary

Problems solved by technology

When the number of keys is changed or the position of the keys is adjusted, the program needs to be rewritten, so this mode is only suitable for stable products with small changes. Once the product changes frequently, t

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