A kind of detection circuit and embedded device of serial line plugging and unplugging

Abstract

A serial line plug-in detection circuit and an embedded device, the circuit includes: a bias resistor, a level conversion circuit and a processor, the first end of the bias resistor is connected to the first power supply, and the second end of the bias resistor is used for Connect to the GND pin of the target serial port; the input end of the level conversion circuit is connected to the second end of the bias resistor, and the output end of the level conversion circuit is connected to the input end of the processor; the processor is used to detect the level conversion When the output signal of the circuit is a high-level signal, the control register writes state 0, when it is detected that the output signal of the level conversion circuit is a low-level signal, the control register writes state 1, and the processor detects that the write state of the register occurs When changing, a CPU interrupt signal is generated and sent to the CPU, which realizes real-time monitoring of the plugging and unplugging status of the target serial port of the embedded device.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a serial port line insertion and removal detection circuit and embedded equipment. Background technique [0002] For embedded devices such as switches / routers / servers, etc., the serial port is an essential peripheral interface during device startup / configuration / maintenance and repair. Through these peripheral interfaces, device details can be printed, and can also be used for device The debugging software inside can also be used to configure various functions or services of the device, etc., to realize the control of the device and the retrieval of data. [0003] The DB9 interface is an excellent peripheral interface, but due to the large size of the DB9 serial port connector and the limited panel space of the embedded device, RJ45 (8 pins) is usually used as the physical interface form of the serial port, but due to repeated plugging and unplugging of the RJ45 Fina...

AI Technical Summary

Problems solved by technology

[0005] When the serial port is used as a debugging function, it is necessary to capture system operation log files through the serial port for a long time. In the prior art, the serial port often has problems of poor insertion or even falling off, resulting in failure to capture log files and loss of important information.

It brings significant loss of time, energy and other aspects to the debugging of embedded devices

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