A button circuit, gamepad and method for real-time detection of button trigger state

Abstract

The invention discloses a key circuit for detecting a key trigger state in real time, a gamepad and a method. The key circuit can detect the trigger states of 2N keys, and comprises a MCU (microprogrammed control unit), a counter, a data selector, an OR gate circuit and a key unit including 2N keys, wherein N is positive integer greater than or equal to 2. The gamepad comprises the key circuit. The method comprises the following steps: controlling the MCU to output a trigger signal to trigger the counter so that the counter can output a N-bit address selection signal, inputting the N-bit address selection signal to a data selector so that the data selector can select the corresponding key state signal; and inputting the key state signal in the MCU to detect. The technical scheme disclosed by the invention can effectively detect a plurality of key trigger states in real time by only using three input output ports of the MCU, the I / O port resource of the MCU is saved, the circuit production cost is reduced, and the circuit working efficiency is improved.

Description

technical field [0001] The invention relates to the field of circuit design, in particular to a button circuit, a game handle and a method for real-time detection of a button trigger state. Background technique [0002] The button circuit is the most important human-computer interaction input method in the MCU application system of the micro control unit. Its reasonable design can not only save the design cost of the system, but also make the operation of the equipment easier and more convenient. improve the overall performance of the system. [0003] At present, the most common button circuits are roughly divided into two types: one-to-one connection and matrix connection. One-to-one connection means that a button directly corresponds to an input port of an MCU. Such a circuit is simple and direct, and can be used directly when the number of buttons is small and the number of ports is rich, but when the number of buttons is large, it will occupy a large number of I / O ports...

AI Technical Summary

Problems solved by technology

[0007] Even so, the matrix connection of the button circuit is increasingly unable to meet the needs of the rapid development of electronic information technology for port resources. How to minimize the occupation of the I / O port by the button circuit and how to reduce the number of buttons The occupation of memory and computing resources by circuits is one of the current research hotspots

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