CN114624635B - Plug detection system and method of VGA display interface and electronic equipment - Google Patents
Plug detection system and method of VGA display interface and electronic equipment Download PDFInfo
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- CN114624635B CN114624635B CN202210532031.6A CN202210532031A CN114624635B CN 114624635 B CN114624635 B CN 114624635B CN 202210532031 A CN202210532031 A CN 202210532031A CN 114624635 B CN114624635 B CN 114624635B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/68—Testing of releasable connections, e.g. of terminals mounted on a printed circuit board
- G01R31/69—Testing of releasable connections, e.g. of terminals mounted on a printed circuit board of terminals at the end of a cable or a wire harness; of plugs; of sockets, e.g. wall sockets or power sockets in appliances
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Abstract
The invention discloses a plug detection system, a plug detection method and electronic equipment of a VGA display interface, wherein the VGA display interface comprises a first pin and a second pin which are in a suspended state or in a high-resistance state, and the plug detection system comprises a potential pull-up circuit and a signal processing module; the potential pull-up circuit is respectively connected with the first pin and the second pin and is used for pulling up the potentials of the first pin and the second pin to a high level; the input end of the signal processing module is connected with the first pin and the second pin and is used for judging whether a VGA cable is connected to the VGA display interface or not according to potential signals of the first pin and the second pin; the VGA cable is a commercial standard VGA cable, and two pins of the VGA cable corresponding to the first pin and the second pin are both connected to shielding ground. The VGA cable is connected to the VGA display interface or not can be detected on the premise that information interaction is not generated.
Description
Technical Field
The present invention relates to the field of port detection, and in particular, to a system, a method, and an electronic device for detecting a plug of a VGA display interface.
Background
At present, for the electronic equipment with security requirements, all peripheral ports on the electronic equipment can become information leakage openings, and the insertion operation of unauthorized peripherals can possibly cause information interaction with the electronic equipment from the bottom layer, so that the risk of information leakage exists. Therefore, the plug detection needs to be carried out on the peripheral port of the electronic equipment, so that the defense is timely carried out, and the improvement of the information safety and reliability of the electronic equipment is facilitated.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and provides a system, a method and electronic equipment for detecting the plugging of a VGA display interface, which can detect whether a VGA cable is connected to the VGA display interface or not on the premise of not generating information interaction.
In a first aspect, an embodiment of the present invention provides a plug detection system for a VGA display interface, where the VGA display interface includes a first pin and a second pin in a suspended state or in a high-resistance state, and the plug detection system includes:
the potential pull-up circuit is respectively connected with the first pin and the second pin and is used for pulling up the potentials of the first pin and the second pin to a high level;
the input end of the signal processing module is connected with the first pin and the second pin and is used for judging whether a VGA cable is connected to the VGA display interface according to potential signals of the first pin and the second pin;
wherein:
the VGA cable is a commercial standard VGA cable, and the VGA cable is connected to shielding ground corresponding to the first pin and the second pin.
The system for detecting the plug of the VGA display interface provided by the embodiment of the invention has at least the following beneficial effects: the potential of the first pin and the second pin are pulled up to high level by setting a potential pull-up circuit, and when no VGA cable is connected to the VGA display interface, high level signals of the first pin and the second pin are input to the signal processing module; when the VGA cable is connected to the VGA display interface, the commercial standard VGA cable is connected to the shielding ground corresponding to the first pin and the second pin, so that the electric potential of the first pin and the second pin is pulled down to a low level, and the signals input to the signal processing module by the first pin and the second pin are low-level signals; finally, the signal processing module judges whether a VGA cable is connected to the VGA display interface or not according to potential signals of the first pin and the second pin; whether the VGA cable is connected to the VGA display interface or not can be detected on the premise that information interaction is not generated; in addition, because the potential pull-up circuit is independently arranged, the electronic equipment with the VGA display interface does not need to provide power, and whether the electronic equipment with the VGA display interface is in a starting-up state or a closing-down state can also detect whether a VGA cable is connected to the VGA display interface.
In the plug detection system of the VGA display interface according to an embodiment of the present invention, the potential pull-up circuit includes a dc power supply terminal, a first resistor and a second resistor, the dc power supply terminal is connected to the first pin through the first resistor, and the dc power supply terminal is connected to the second pin through the second resistor.
The direct-current power supply end is connected to the first pin through the first resistor so as to pull up the potential of the first pin to a high level; the direct current power supply end is connected to the second pin through the second resistor so as to pull up the potential of the second pin to a high level.
In the plug detection system of the VGA display interface according to an embodiment of the present invention, the plug detection system further includes an or gate, the first pin and the second pin are respectively connected to an input end of the or gate, and an output end of the or gate is connected to an input end of the signal processing module.
The first pin and the second pin are respectively connected to the input end of the OR gate, and when no VGA cable is connected to the VGA display interface, high-level signals of the first pin and the second pin are input to the OR gate, so that switching value signals output by the OR gate are also high-level signals; when the VGA cable is connected to the VGA display interface, the two pins of the VGA cable corresponding to the first pin and the second pin are connected to shielding ground, so that the electric potential of the first pin and the electric potential of the second pin are pulled down to a low level, signals input to the OR gate by the first pin and the second pin are low-level signals, and switching value signals output by the OR gate are low-level signals; and finally, the signal processing module is connected with the output end of the OR gate to acquire a switching value signal output by the OR gate, so that whether a VGA cable is connected to the VGA display interface is judged according to the switching value signal output by the OR gate.
In the plug detection system of the VGA display interface according to the embodiment of the invention, the signal processing module is provided with a plug signal output port;
when the switching value signal output by the OR gate is a low-level signal, the plug signal output port outputs a second signal, and the second signal indicates that a VGA cable is connected to the VGA display interface;
when the switching value signal output by the OR gate is a high-level signal, the plug signal output port outputs a first signal, and the first signal indicates that no VGA cable is connected to the VGA display interface.
In another embodiment of the present invention, the plug detection system of the VGA display interface further includes a nor gate, where the first pin and the second pin are respectively connected to an input end of the nor gate, and an output end of the nor gate is connected to an input end of the signal processing module.
In the plug detection system of the VGA display interface according to an embodiment of the present invention, the plug detection system further includes an inverse and gate, the first pin and the second pin are respectively connected to an input end of the inverse and gate, and an output end of the inverse and gate is connected to an input end of the signal processing module.
In the plug detection system of the VGA display interface of the embodiment of the invention, the VGA display interface adopts a D-Sub interface, and the first Pin and the second Pin are Pin4 Pin and Pin11 Pin in the D-Sub interface respectively.
In the plug detection system of the VGA display interface of some embodiments of the present invention, the signal processing module is a processor, a logic circuit or a programmable logic device.
In the system for detecting the plug of the VGA display interface according to the embodiment of the invention, the system further comprises a power management module, wherein the power management module is connected with the signal processing module.
In a second aspect, an embodiment of the present invention provides a method for detecting a plug of a VGA display interface, which is applied to a signal processing module in a plug detection system of the VGA display interface, where the VGA display interface includes a first pin and a second pin in a suspended state or in a high-resistance state, and the plug detection system further includes a potential pull-up circuit; the potential pull-up circuit is respectively connected with the first pin and the second pin and is used for pulling up the potentials of the first pin and the second pin to a high level; the first pin and the second pin are connected to an input end of the signal processing module, and the method comprises the following steps:
acquiring potential signals of the first pin and the second pin;
judging whether a VGA cable is connected to the VGA display interface or not according to the potential signals of the first pin and the second pin.
The VGA display interface plug detection method provided by the embodiment of the invention has at least the following beneficial effects: the plug detection system of the VGA display interface pulls up the electric potentials of the first pin and the second pin to high level by setting an electric potential pull-up circuit, and when no VGA cable is connected to the VGA display interface, high level signals of the first pin and the second pin are input to the signal processing module; when the VGA cable is connected to the VGA display interface, the two pins of the VGA cable corresponding to the first pin and the second pin are connected to the shielding ground, so that the electric potentials of the first pin and the second pin are pulled down to a low level, and the signals input to the signal processing module by the first pin and the second pin are low-level signals; finally, the signal processing module judges whether a VGA cable is connected to the VGA display interface or not according to potential signals of the first pin and the second pin; whether the VGA cable is connected to the VGA display interface or not can be detected on the premise that information interaction is not generated; in addition, because the plug detection system of the VGA display interface is independently provided with the potential pull-up circuit, the electronic equipment with the VGA display interface does not need to provide power, and therefore whether the electronic equipment with the VGA display interface is in a starting-up state or a shutdown state or not can also detect whether a VGA cable is connected to the VGA display interface.
In the method for detecting the plug of the VGA display interface according to an embodiment of the present invention, the plug detection system of the VGA display interface further includes an or gate, the first pin and the second pin are respectively connected to an input end of the or gate, an output end of the or gate is connected to an input end of the signal processing module, and the signal processing module is provided with a plug signal output port;
when the switching value signal output by the OR gate is a low-level signal, the plug signal output port outputs a second signal, and the second signal indicates that a VGA cable is connected to the VGA display interface;
when the switching value signal output by the OR gate is a high-level signal, the plug signal output port outputs a first signal, and the first signal indicates that no VGA cable is connected to the VGA display interface.
In the method for detecting the plug of the VGA display interface according to another embodiment of the present invention, the plug detection system of the VGA display interface further includes a nor gate, the first pin and the second pin are respectively connected to an input end of the nor gate, an output end of the nor gate is connected to an input end of the signal processing module, and the signal processing module is provided with a plug signal output port;
when the switching value signal output by the NOR gate is a high-level signal, the plug signal output port outputs a second signal, and the second signal indicates that a VGA cable is connected to the VGA display interface;
when the switching value signal output by the NOR gate is a low-level signal, the plug signal output port outputs a first signal, and the first signal indicates that no VGA cable is connected to the VGA display interface.
In the method for detecting the plug of the VGA display interface according to an embodiment of the present invention, the plug detection system of the VGA display interface further includes an inverse and gate, the first pin and the second pin are respectively connected to the input end of the inverse and gate, the output end of the inverse and gate is connected to the input end of the signal processing module, and the signal processing module is provided with a plug signal output port;
when the switching value signal output by the inverse AND gate is a low-level signal, the plug signal output port outputs a second signal, and the second signal indicates that a VGA cable is connected to the VGA display interface;
when the switching value signal output by the inverse AND gate is a high-level signal, the plug signal output port outputs a first signal, and the first signal indicates that no VGA cable is connected to the VGA display interface.
In a third aspect, an embodiment of the present invention provides an electronic device, including a plug detection system of a VGA display interface according to the embodiment of the first aspect.
The electronic equipment provided by the embodiment of the invention has at least the following beneficial effects: the plug detection system pulls up the electric potentials of the first pin and the second pin to high level by setting an electric potential pull-up circuit, and when no VGA cable is connected to the VGA display interface, high level signals of the first pin and the second pin are input to the signal processing module; when the VGA cable is connected to the VGA display interface, the commercial standard VGA cable is connected to the shielding ground corresponding to the first pin and the second pin, so that the electric potential of the first pin and the second pin is pulled down to a low level, and the signals input to the signal processing module by the first pin and the second pin are low-level signals; finally, the signal processing module judges whether a VGA cable is connected to the VGA display interface or not according to potential signals of the first pin and the second pin; whether the VGA cable is connected to the VGA display interface or not can be detected on the premise that information interaction is not generated; in addition, because the potential pull-up circuit is independently arranged, the electronic equipment with the VGA display interface does not need to provide power, and whether the electronic equipment with the VGA display interface is in a starting-up state or a closing-down state can also detect whether a VGA cable is connected to the VGA display interface.
In a fourth aspect, an embodiment of the present invention provides a computer readable storage medium, where computer executable instructions are stored, where the computer executable instructions are configured to cause a computer to perform a method for detecting a plug of a VGA display interface according to the embodiment of the second aspect.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate and do not limit the invention.
The invention is further described below with reference to the drawings and examples;
fig. 1 is a schematic structural diagram of a plug detection system of a VGA display interface according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a plug detection system of a VGA display interface according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a plug detection system of a VGA display interface according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a plug detection system of a VGA display interface according to still another embodiment of the present invention;
fig. 5 is a flowchart of a plug detection method of a VGA display interface according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present invention, but not to limit the scope of the present invention.
In the description of the present invention, the description of the first and second is only for the purpose of distinguishing technical features, and should not be construed as indicating or implying relative importance or implying the number of technical features indicated or the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
The embodiment of the invention provides a plug detection system, a plug detection method and electronic equipment for a VGA display interface, which can detect whether a VGA cable is connected to the VGA display interface or not on the premise of not generating information interaction.
Embodiments of the present invention will be further described below with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the first aspect of the present invention provides a plug detection system of a VGA display interface, the VGA display interface including a first pin 100 and a second pin 200 in a suspended state or in a high-resistance state, the plug detection system including:
the potential pull-up circuit 300 is connected with the first pin 100 and the second pin 200 respectively, and is used for pulling up the potentials of the first pin 100 and the second pin 200 to a high level;
the signal processing module 500, the input end of the signal processing module 500 and the first pin 100 and the second pin 200 are used for judging whether a VGA cable is connected to the VGA display interface according to the potential signals of the first pin 100 and the second pin 200;
wherein:
the VGA cable is a commercial standard VGA cable, and two pins of the VGA cable corresponding to the first pin 100 and the second pin 200 are both connected to the shielding ground.
According to the plug detection system of the VGA display interface provided by the embodiment of the invention, the electric potential of the first pin 100 and the second pin 200 is pulled up to a high level by setting the electric potential pull-up circuit 300, and when no VGA cable is connected to the VGA display interface, high-level signals of the first pin 100 and the second pin 200 are input to the signal processing module 500; when the VGA cable is connected to the VGA display interface, since the commercial standard VGA cable is connected to the shielding ground corresponding to the two pins of the first pin 100 and the second pin 200, the electric potentials of the first pin 100 and the second pin 200 are also pulled down to a low level, so that the signals input to the signal processing module 500 by the first pin 100 and the second pin 200 are low level signals; finally, the signal processing module 500 judges whether a VGA cable is connected to the VGA display interface according to the potential signals of the first pin 100 and the second pin 200; whether the VGA cable is connected to the VGA display interface or not can be detected on the premise that information interaction is not generated; in addition, since the potential pull-up circuit 300 is separately set, the electronic device where the VGA display interface is located does not need to provide power, and therefore whether the electronic device where the VGA display interface is located is in a power-on or power-off state or not can also detect whether the VGA cable is connected to the VGA display interface.
It can be understood by those skilled in the art that the VGA display interface is a port commonly used by a computer, and the plug detection system of the VGA display interface provided by the invention can be matched with a port controlled physical blocking technology and a port authentication authorization technology, detect the peripheral plug condition of the VGA display interface before the information of the electronic equipment is transmitted to the external equipment, control the access of the port at the physical layer, and defend against unauthorized peripheral in advance. Specifically, when detecting that a peripheral is accessed, authenticating and authenticating the peripheral, and when the peripheral is an authorized peripheral, normally communicating an external information channel of a VGA display interface of the electronic equipment; if the peripheral is judged to be an unauthorized peripheral, cutting off an external information channel of a VGA display interface of the electronic equipment at a physical layer; and when the authorized peripheral is pulled out, the external information channel of the VGA display interface of the electronic equipment is cut off at the physical layer. The controlled physical blocking system can set a switch module on an information transmission connection line of the VGA display interface and an internal device of the electronic equipment, and control the switch module according to an output signal of a signal processing module of the plug detection system and an authentication result, so as to control the connection and disconnection of an external channel of the VGA display interface of the electronic equipment, and realize the effect that the information channel of the VGA display interface is only opened to authorized peripherals, namely only transmits information to the authorized peripherals. It is easily understood that blocking at the physical layer can prevent hackers from stealing information in the electronic device by cracking the VGA display interface. Under the condition that the authorized peripheral is pulled out or the unauthorized peripheral is connected to the VGA display interface, the VGA display interface is blocked in a physical layer, so that the electric interface can be prevented from conducting and leaking, and the digital signal of the display port is prevented from being intercepted and restored to cause information to leak. It is further easy to understand that, in the plug detection system of the VGA display interface provided by the embodiment of the present invention, the port controlled physical blocking technology and the port authentication authorization technology are matched, so that not only can unauthorized peripherals be prevented from acquiring information of the electronic device according to the authentication result, but also users can find whether the peripherals are replaced in time, and prevent others from randomly replacing the peripherals, for example, for a security computer provided with the plug detection system of the VGA display interface, the security display is provided with a security display, and can have the functions of off-position screen protection, peeping prevention and window inspection, the security display is set as an authorized peripheral, and is allowed to be accessed to the VGA display interface of the security computer and read image information from the security computer, but when other displays are accessed to the VGA display interface of the security computer, image information cannot be acquired, and if the security screen display is replaced with a common display, the security computer can be found in time, and plug events can be recorded, so that such spy behavior can be left behind the owner, and help to post-tracing. In addition, the confidential computer is matched with the authorized display, so that a user can acquire the image information, if only the host of the confidential computer is stolen and the authorized display is not available, the image information of the confidential computer cannot be acquired by using the unauthorized display at the first time, and the confidentiality and the safety in the confidential computer are improved to a certain extent.
It should also be understood by those skilled in the art that at present, some display signal sources with scrambling are connected to electronic equipment, so that the scrambling strength can be reduced or eliminated, and thus, a stealer can receive and restore display information through electromagnetic radiation and steal secret information. In addition, at present, in order to prevent display electromagnetic radiation and electromagnetic reconstruction, a video interference device can be connected between the electronic equipment and the display, and the VGA display interface plug detection system can detect illegal operations such as pulling out and bypass of the video interference device, so that the risk of leakage of display signals due to electromagnetic radiation and electromagnetic reconstruction is reduced to a certain extent.
It should be noted that, the electronic device in this embodiment may be a computer, or may be another device provided with a VGA display interface, and the external device in this embodiment may be a display.
Referring to fig. 1, in the plug detection system of the VGA display interface according to an embodiment of the present invention, the potential pull-up circuit 300 includes a dc power terminal Vcc, a first resistor R1 and a second resistor R2, the dc power terminal Vcc is connected to the first pin 100 through the first resistor R1, and the dc power terminal Vcc is connected to the second pin 200 through the second resistor R2.
By setting the dc power supply terminal Vcc, the dc power supply terminal Vcc is connected to the first pin 100 through the first resistor R1 so as to achieve pulling up the potential of the first pin 100 to a high level; the dc power supply terminal Vcc is connected to the second pin 200 through the second resistor R2 to thereby pull up the potential of the second pin 200 to a high level.
Referring to fig. 2, in the plug detection system of the VGA display interface according to an embodiment of the present invention, the plug detection system further includes an or gate 400, the first pin 100 and the second pin 200 are respectively connected to an input terminal of the or gate 400, and an output terminal of the or gate 400 is connected to an input terminal of the signal processing module 500.
The first pin 100 and the second pin 200 are respectively connected to the input end of the or gate 400, when no VGA cable is connected to the VGA display interface, the high-level signals of the first pin 100 and the second pin 200 are input to the or gate 400, so that the switching value signals output by the or gate 400 are also high-level signals; when the VGA cable is connected to the VGA display interface, the VGA cable is connected to the shielding ground corresponding to the two pins of the first pin 100 and the second pin 200, so that the electric potentials of the first pin 100 and the second pin 200 are pulled down to a low level, so that the signals input to the or gate 400 by the first pin 100 and the second pin 200 are low-level signals, and the switching value signals output by the or gate 400 are also low-level signals; finally, the signal processing module 500 is connected with the output end of the or gate 400 to obtain a switching value signal output by the or gate 400, so as to judge whether a VGA cable is connected to the VGA display interface according to the switching value signal output by the or gate 400; the VGA cable is connected to the VGA display interface or not can be detected on the premise that information interaction is not generated.
Referring to fig. 2, in the plug detection system of the VGA display interface according to an embodiment of the present invention, a signal processing module 500 is provided with a plug signal output port 510;
when the switching value signal output by the or gate 400 is a low level signal, the pluggable signal output port 510 outputs a second signal, wherein the second signal indicates that a VGA cable is connected to the VGA display interface;
when the switching value signal output by the or gate 400 is a high level signal, the add/drop signal output port 510 outputs a first signal, where the first signal indicates that no VGA cable is connected to the VGA display interface.
The plug signal output port 510 is configured to output a first signal and a second signal, and then a prompt or response control operation can be performed according to the first signal and the second signal, for example, a trusted legal peripheral is plugged out, and a VGA display interface can be blocked and controlled according to the first signal received; if no authorization or trusted peripheral is inserted, the VGA display interface is kept in a blocking state even if the second signal is received, an external channel of the computer sensitive information is cut off, the occurrence of sensitive information leakage is stopped, and the effect of secret pre-defense is achieved.
It can be understood that the plug detection system senses and detects the plug-in and plug-out operations of the external device of the VGA display interface, and records and outputs a plug-in detection signal through the plug-in signal output port 510; the VGA display interface of the computer can be completely controlled by processing the plug detection signal and combining the controlled physical blocking, physical isolation and port authentication authorization operation of the computer port, so that the leakage of sensitive information is avoided.
Referring to fig. 3, in the plug detection system of the VGA display interface according to another embodiment of the present invention, the plug detection system further includes a nor gate 700, the first pin 100 and the second pin 200 are respectively connected to an input terminal of the nor gate 700, and an output terminal of the nor gate 700 is connected to an input terminal of the signal processing module 500.
Unlike the embodiment shown in fig. 2 in which the or gate 400 is used to process the level signals of the first pin 100 and the second pin 200, the present embodiment uses the nor gate 700 to process the level signals of the first pin 100 and the second pin 200, which can achieve the same control effect.
Referring to fig. 4, in the plug detection system of the VGA display interface according to another embodiment of the present invention, the plug detection system further includes an inverse and gate 800, the first pin 100 and the second pin 200 are respectively connected to the input terminal of the inverse and gate 800, and the output terminal of the inverse and gate 800 is connected to the input terminal of the signal processing module 500.
Unlike the embodiment of processing the level signals of the first pin 100 and the second pin 200 using the or gate 400 shown in fig. 2 and the embodiment of processing the level signals of the first pin 100 and the second pin 200 using the nor gate 700 shown in fig. 3, the present embodiment uses the inverse and gate 800 to process the level signals of the first pin 100 and the second pin 200, which can achieve the same control effect.
It is understood that other digital logic circuits may be used to process the level signals of the first pin 100 and the second pin 200, so long as the same control effect is achieved.
Referring to fig. 1, fig. 2, or fig. 3, in the insertion and extraction detection system of a VGA display interface according to an embodiment of the present invention, the VGA display interface adopts a D-Sub interface, and the first Pin 100 and the second Pin 200 are Pin4 Pin and Pin11 Pin in the D-Sub interface, respectively.
It should be noted that, in the definition of the signal of the VGA display interface source (computer VGA display output port) DB15 connector specified by the VGA (D-SUB) display interface standard of VESA (video electronics standards association), pin4 (Pin 4) is the third bit ID2 of the 4-bit address code ID signals (ID 0 to ID 3), and this signal is usually not connected or reserved in the actual design and use of the computer display interface, i.e. is in a suspended or high-resistance state. The 11 th Pin (Pin 11) is the first ID0 of the 4-bit address code ID signals (ID 0-ID 3), which are usually unconnected or reserved in the actual design and use of the computer display interface, i.e. in a floating or high-resistance state.
In addition, in the DB15 connector signal definition of the standard commercial VGA cable, pin4 (Pin 4), pin5 (Pin 5 signal ground), pin6 (Pin 6), pin7 (Pin 7), pin8 (Pin 8), pin11 (Pin 11) are short-circuited with the connector housing (shielded ground).
The idea of the embodiment of the invention is that the 4 th Pin (Pin 4) ID2 signal and the 11 th Pin (Pin 11) ID0 signal of the DB15 connector signal of the VGA display output port of a computer are respectively pulled up to Vcc (+5V) in a plug detection system, then the two signals are subjected to logic or operation, and a plug detection switching value signal is output from the output end of an OR gate. The practical effect is that as long as the VGA cable is inserted into the VGA display interface of the computer, one or two of the 4 th Pin (Pin 4) ID2 signal and the 11 th Pin (Pin 11) ID0 signal of the VGA display interface are pulled down due to the short circuit of the Pin4, pin11 and the ground of the VGA cable, and the switching value signal can generate level jump from high to low; when the VGA cable is pulled out of a VGA display interface of a computer, as a 4 th Pin (Pin 4) ID2 signal and an 11 th Pin (Pin 11) ID0 signal of the VGA display interface can be pulled up at the same time, a switching value signal can generate level jump from low to high; the switching value signal is then processed by the signal processing module 500 to generate and output a VGA display device and its cable plug event.
In the plug detection system of the VGA display interface according to some embodiments of the present invention, the signal processing module 500 is a processor, a logic circuit or a programmable logic device.
It is understood that the signal processing module 500 may be other types of processing modules, as long as the level signal of the first pin 100, the second pin 200, or the switching value signal output by the or gate 400 can be processed.
Referring to fig. 1, in the plug detection system of the VGA display interface according to an embodiment of the present invention, the plug detection system further includes a power management module 600, and the power management module 600 is connected to the signal processing module 500.
It can be appreciated that, the power management module 600 is configured to supply power to the signal processing module 500, so that the plug detection system can still work normally in a power-off or shutdown state of the electronic device. The structure of the power management module 600 is not particularly limited in this embodiment, as long as the power can be supplied to the signal processing module 500 of the plug detection system.
In addition, referring to fig. 5, a second aspect of the present invention provides a method for detecting a plug of a VGA display interface, which is applied to a signal processing module 500 in a plug detection system of the VGA display interface of fig. 1, where the VGA display interface includes a first pin 100 and a second pin 200 in a suspended state or in a high-resistance state, and the plug detection system further includes a potential pull-up circuit 300; the potential pull-up circuit 300 is connected to the first pin 100 and the second pin 200, respectively, and is used for pulling up the potentials of the first pin 100 and the second pin 200 to a high level; the first pin 100 and the second pin 200 are connected to the input terminal of the signal processing module 500, and the method includes, but is not limited to, step S510 and step S520, wherein:
step S510: acquiring potential signals of the first pin 100 and the second pin 200;
step S520: and judging whether a VGA cable is connected to a VGA display interface or not according to potential signals of the first pin 100 and the second pin 200.
According to the method for detecting the plug of the VGA display interface provided by the embodiment of the invention, the plug detection system of the VGA display interface pulls up the electric potentials of the first pin 100 and the second pin 200 to a high level by arranging the electric potential pull-up circuit 300, and when no VGA cable is connected to the VGA display interface, high-level signals of the first pin 100 and the second pin 200 are input to the signal processing module 500; when the VGA cable is connected to the VGA display interface, since the VGA cable is connected to the shielding ground corresponding to the two pins of the first pin 100 and the second pin 200, the electric potentials of the first pin 100 and the second pin 200 are also pulled down to a low level, so that the signals input to the signal processing module 500 by the first pin 100 and the second pin 200 are low level signals; finally, the signal processing module 500 judges whether a VGA cable is connected to the VGA display interface according to the potential signals of the first pin 100 and the second pin 200; whether the VGA cable is connected to the VGA display interface or not can be detected on the premise that information interaction is not generated; in addition, because the plug detection system of the VGA display interface is independently provided with the potential pull-up circuit 300, the electronic equipment where the VGA display interface is positioned does not need to provide power, and whether the electronic equipment where the VGA display interface is positioned is in a starting-up state or a shutdown state or not can also detect whether the VGA cable is connected to the VGA display interface or not.
After the VGA cable is connected to the VGA display interface, the electric potential of the first pin 100 and the electric potential of the second pin 200 are both low, so that one of the two is high and is a sufficient condition for detecting that the VGA cable is pulled out from the VGA display interface, and the other is low and is a sufficient and necessary condition for detecting that the VGA cable is connected to the VGA display interface.
Therefore, in step S520, it is determined whether a VGA cable is connected to the VGA display interface according to the potential signals of the first pin 100 and the second pin 200, and the specific determination method is as follows:
when one of the electric potential of the first pin 100 and the electric potential of the second pin 200 is at a high level, judging that no VGA cable is connected to the VGA display interface;
when the electric potential of the first pin 100 and the electric potential of the second pin 200 are both at low level, it is determined that the VGA cable is connected to the VGA display interface.
In the method for detecting the plug of the VGA display interface according to an embodiment of the present invention, referring to fig. 2, the plug detection system of the VGA display interface further includes an or gate 400, the first pin 100 and the second pin 200 are respectively connected to the input end of the or gate 400, the output end of the or gate 400 is connected to the input end of the signal processing module 500, and the signal processing module 500 is provided with a plug signal output port 510;
when the switching value signal output by the or gate 400 is a low level signal, the pluggable signal output port 510 outputs a second signal, wherein the second signal indicates that a VGA cable is connected to the VGA display interface;
when the switching value signal output by the or gate 400 is a high level signal, the add/drop signal output port 510 outputs a first signal, where the first signal indicates that no VGA cable is connected to the VGA display interface.
In the method for detecting the plug of the VGA display interface according to another embodiment of the present invention, referring to fig. 3, the plug detection system of the VGA display interface further includes a nor gate 700, the first pin 100 and the second pin 200 are respectively connected to the input end of the nor gate 700, the output end of the nor gate 700 is connected to the input end of the signal processing module 500, and the signal processing module 500 is provided with a plug signal output port 510;
when the switching value signal output by the nor gate 700 is a high level signal, the pluggable signal output port 510 outputs a second signal, where the second signal indicates that a VGA cable is connected to the VGA display interface;
when the switching value signal output by the nor gate 700 is a low level signal, the add/drop signal output port 510 outputs a first signal, where the first signal indicates that no VGA cable is connected to the VGA display interface.
In the method for detecting the plug of the VGA display interface according to an embodiment of the present invention, referring to fig. 4, the plug detection system of the VGA display interface further includes an inverse and gate 800, the first pin 100 and the second pin 200 are respectively connected to the input end of the inverse and gate 800, the output end of the inverse and gate 800 is connected to the input end of the signal processing module 500, and the signal processing module 500 is provided with a plug signal output port 510;
when the switching value signal output by the inverse AND gate 800 is a low level signal, the pluggable signal output port 510 outputs a second signal, and the second signal indicates that a VGA cable is connected to the VGA display interface;
when the switching value signal output by the inverse AND gate 800 is a high level signal, the add/drop signal output port 510 outputs a first signal, which indicates that no VGA cable is connected to the VGA display interface.
In addition, an embodiment of a third aspect of the present invention provides an electronic device, including the plug detection system of the VGA display interface of the embodiment of the first aspect.
According to the electronic device provided by the embodiment of the invention, the plug detection system pulls up the electric potentials of the first pin 100 and the second pin 200 to a high level by setting the electric potential pull-up circuit 300, and when no VGA cable is connected to the VGA display interface, high-level signals of the first pin 100 and the second pin 200 are input to the signal processing module 500; when the VGA cable is connected to the VGA display interface, since the commercial standard VGA cable is connected to the shielding ground corresponding to the two pins of the first pin 100 and the second pin 200, the electric potentials of the first pin 100 and the second pin 200 are also pulled down to a low level, so that the signals input to the signal processing module 500 by the first pin 100 and the second pin 200 are low level signals; finally, the signal processing module 500 judges whether a VGA cable is connected to the VGA display interface according to the potential signals of the first pin 100 and the second pin 200; whether the VGA cable is connected to the VGA display interface or not can be detected on the premise that information interaction is not generated; in addition, since the potential pull-up circuit 300 is separately set, the electronic device where the VGA display interface is located does not need to provide power, and therefore whether the electronic device where the VGA display interface is located is in a power-on or power-off state or not can also detect whether the VGA cable is connected to the VGA display interface.
In addition, a fourth aspect of the present invention provides a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the method for detecting the plug of the VGA display interface of the above second aspect embodiment, for example, performing the method steps S510 to S520 in fig. 5.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media or non-transitory media and communication media or transitory media. The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk DVD or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.
Claims (4)
1. The utility model provides a plug detecting system of VGA display interface, its characterized in that, VGA display interface includes first pin and the second pin that is in unsettled state or is in the high resistance state, plug detecting system includes:
the potential pull-up circuit is respectively connected with the first pin and the second pin and is used for pulling up the potentials of the first pin and the second pin to a high level;
the input end of the signal processing module is connected with the first pin and the second pin, and is used for judging whether a VGA cable is connected to the VGA display interface according to potential signals of the first pin and the second pin, and the signal processing module specifically comprises:
when one of the potential of the first pin and the potential of the second pin is at a high level, judging that no VGA cable is connected to the VGA display interface;
when the potential of the first pin and the potential of the second pin are both low level, judging that a VGA cable is connected to a VGA display interface;
wherein:
the VGA cable is a commercial standard VGA cable, and the two pins of the VGA cable corresponding to the first pin and the second pin are both connected to a shielding ground;
the potential pull-up circuit comprises a direct current power supply end, a first resistor and a second resistor, wherein the direct current power supply end is connected to the first pin through the first resistor, and the direct current power supply end is connected to the second pin through the second resistor;
the plug detection system further comprises an OR gate, wherein the first pin and the second pin are respectively connected to the input end of the OR gate, and the output end of the OR gate is connected to the input end of the signal processing module; the signal processing module is provided with a pluggable signal output port; when the switching value signal output by the OR gate is a low-level signal, the plug signal output port outputs a second signal, and the second signal indicates that a VGA cable is connected to the VGA display interface; when the switching value signal output by the OR gate is a high-level signal, the plug signal output port outputs a first signal, wherein the first signal indicates that no VGA cable is connected to the VGA display interface;
the plug detection system of the VGA display interface is matched with a port controlled physical blocking technology and a port authentication authorization technology, detects the plug condition of the peripheral equipment of the VGA display interface before the information of the electronic equipment is transmitted to the external equipment, controls the access of the port at a physical layer, and defends against unauthorized peripheral equipment in advance; when detecting that a peripheral is accessed, authenticating the peripheral, and when the peripheral is an authorized peripheral, normally communicating an external information channel of a VGA display interface of the electronic equipment; if the peripheral is judged to be an unauthorized peripheral, cutting off an external information channel of a VGA display interface of the electronic equipment at a physical layer; when the authorized peripheral is pulled out, an external information channel of a VGA display interface of the electronic equipment is cut off at a physical layer;
the controlled physical blocking system is provided with a switch module on an information transmission connection line of the VGA display interface and an internal device of the electronic equipment, and the switch module is controlled according to an output signal of the signal processing module and an authentication result, so that the connection and disconnection of an external channel of the VGA display interface of the electronic equipment are controlled, and the information channel of the VGA display interface is only opened to the authorized peripheral, namely, only information is transmitted to the authorized peripheral;
the VGA display interface adopts a D-Sub interface, and the first Pin and the second Pin are Pin4 Pin and Pin11 Pin in the D-Sub interface respectively; in the plug detection system of the VGA display interface, a 4 th Pin of a DB15 connector signal of a VGA display output port of a computer, namely a Pin4 ID2 signal, and a 11 th Pin of the DB15 connector signal, namely a Pin11 ID0 signal, are respectively pulled up to Vcc, then the two signals are subjected to logic OR operation, and a plug detection switching value signal is output from the output end of an OR gate; as long as the VGA cable is inserted into the VGA display interface of the computer, as Pin4, pin11 and ground of the VGA cable are short-circuited, one or two of a 4 th Pin, namely Pin4 ID2 signal and a 11 th Pin, namely Pin11 ID0 signal, of the VGA display interface are pulled down, and the switching value signal can generate level jump from high to low; when the VGA cable is pulled out of a VGA display interface of a computer, as a 4 th Pin of the VGA display interface, namely a Pin4 ID2 signal, and a 11 th Pin, namely a Pin11 ID0 signal, can be pulled up simultaneously, the switching value signal can generate level jump from low to high; and then the switching value signal is processed by a signal processing module to generate and output VGA display equipment and a cable plugging event thereof.
2. The system of claim 1, wherein the signal processing module is a processor, a logic circuit, or a programmable logic device.
3. The system of claim 1, further comprising a power management module coupled to the signal processing module.
4. An electronic device comprising a plug detection system of a VGA display interface according to any of claims 1 to 3.
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| CN114839571B (en) * | 2022-06-30 | 2022-09-16 | 深圳英集芯科技股份有限公司 | Circuit for detecting plugging and unplugging of equipment and electronic equipment |
| CN116609706B (en) * | 2023-07-19 | 2023-09-19 | 北京同方艾威康科技有限公司 | VGA image quality nondestructive disconnection detection method |
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