CN114624635A - Plug-pull detection system and method of VGA display interface and electronic equipment - Google Patents
Plug-pull detection system and method of VGA display interface and electronic equipment Download PDFInfo
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- CN114624635A CN114624635A CN202210532031.6A CN202210532031A CN114624635A CN 114624635 A CN114624635 A CN 114624635A CN 202210532031 A CN202210532031 A CN 202210532031A CN 114624635 A CN114624635 A CN 114624635A
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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
Abstract
The invention discloses a plug-pull detection system and method of a VGA display interface and an electronic device, wherein the VGA display interface comprises a first pin and a second pin which are in a suspended state or a high-resistance state, and the plug-pull 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 the potentials of the first pin and the second pin up to a high level; the input end of the signal processing module is connected with the first pin and the second pin and 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 the shielding ground. On the premise of not generating information interaction, whether a VGA cable is connected to a VGA display interface or not can be detected.
Description
Technical Field
The invention relates to the field of port detection, in particular to a system and a method for detecting plugging and unplugging of a VGA display interface and electronic equipment.
Background
At present, for electronic equipment with a secrecy requirement, all peripheral ports on the electronic equipment can be breached for information leakage, and the insertion operation of unauthorized peripherals can possibly cause information interaction with the electronic equipment from a bottom layer, so that the risk of information leakage exists. Therefore, the peripheral port of the electronic device needs to be plugged and unplugged for detection, so that defense can be timely performed, and the information safety and reliability of the electronic device can be improved.
Disclosure of Invention
The present invention is directed to solve at least one of the technical problems in the prior art, and provides a system and a method for detecting insertion/extraction of a VGA display interface, and an electronic device, which can detect whether a VGA cable is connected to the VGA display interface without generating information interaction.
In a first aspect, an embodiment of the present invention provides a plugging detection system for a VGA display interface, where the VGA display interface includes a first pin and a second pin that are in a suspended state or in a high impedance state, and the plugging detection system includes:
the potential pull-up circuit is respectively connected with the first pin and the second pin and is used for pulling the potentials of the first pin and the second pin up to a high level;
the input end of the signal processing module is connected with the first pin and the second pin and 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;
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 plug-pull detection system of the VGA display interface provided by the embodiment of the invention at least has the following beneficial effects: the electric potential of the first pin and the electric potential of the second pin are pulled up to a high level by arranging 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 a VGA cable is connected to a VGA display interface, because two pins corresponding to a first pin and a second pin of a commercial standard VGA cable are both connected to a shielding ground, the potentials of the first pin and the second pin are pulled down to a low level, so that signals input to a 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 the potential signals of the first pin and the second pin; on the premise of not generating information interaction, whether a VGA cable is connected to a VGA display interface or not can be detected; in addition, the potential pull-up circuit is independently arranged, so that the electronic equipment where the VGA display interface is located does not need to provide a power supply, and whether the electronic equipment where the VGA display interface is located is in a power-on state or a power-off state or not can be detected whether a VGA cable is connected to the VGA display interface or not.
In the system for detecting plugging and unplugging of a VGA display interface according to an embodiment of the present invention, the potential pull-up circuit includes a dc power source terminal, a first resistor, and a second resistor, the dc power source terminal is connected to the first pin through the first resistor, and the dc power source terminal is connected to the second pin through the second resistor.
By arranging the direct current power supply end, 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 system for detecting the plugging and unplugging of the VGA display interface according to an embodiment of the present invention, the system further includes an or gate, the first pin and the second pin are respectively connected to an input terminal of the or gate, and an output terminal of the or gate is connected to an input terminal 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 a switching value signal output by the OR gate is also a high-level signal; when a VGA cable is connected to a VGA display interface, because two pins corresponding to a first pin and a second pin of the VGA cable are both connected to a shielding ground, the potentials of the first pin and the second pin are pulled down to a low level, so that signals input to an OR gate by the first pin and the second pin are low level signals, and further, a switching value signal output by the OR gate is also a low level signal; and finally, the signal processing module is connected with the output end of the OR gate to acquire the switching value signal output by the OR gate, so that whether a VGA cable is connected to the VGA display interface or not 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 an embodiment of the present 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 plugging 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 plugging 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 system for detecting insertion and extraction of a VGA display interface according to another embodiment of the present invention, the system further includes a nor gate, the first pin and the second pin are respectively connected to an input terminal of the nor gate, and an output terminal of the nor gate is connected to an input terminal of the signal processing module.
In the system for detecting plugging and unplugging of a VGA display interface according to an embodiment of the present invention, the system further includes an inverted and gate, the first pin and the second pin are respectively connected to an input end of the inverted and gate, and an output end of the inverted and gate is connected to an input end of the signal processing module.
In the system for detecting the plugging and unplugging of the VGA display interface according to an embodiment of the present invention, the VGA display interface employs a D-Sub interface, and the first Pin and the second Pin are a Pin4 Pin and a Pin11 Pin of the D-Sub interface, respectively.
In the system for detecting insertion and extraction of a VGA display interface according to 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 plugging and unplugging of the VGA display interface according to an embodiment of the present invention, the system further includes a power management module, and the power management module is connected to the signal processing module.
In a second aspect, an embodiment of the present invention provides a method for detecting plugging and unplugging of a VGA display interface, which is applied to a signal processing module in a plugging and unplugging detection system of the VGA display interface, where the VGA display interface includes a first pin and a second pin that are in a suspended state or in a high-impedance state, and the plugging and unplugging 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 used for pulling the potentials of the first pin and the second pin up 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;
and 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 plug-pull detection method of the VGA display interface provided by the embodiment of the invention at least has the following beneficial effects: the plugging 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 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 a VGA cable is connected to the VGA display interface, because two pins corresponding to the first pin and the second pin of the VGA cable are both connected to a shielding ground, the potentials of the first pin and the second pin are pulled down to a low level, so that 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 the potential signals of the first pin and the second pin; on the premise of not generating information interaction, whether a VGA cable is connected to a VGA display interface or not can be detected; in addition, the plug detection system of the VGA display interface is independently provided with the potential pull-up circuit, and the electronic equipment where the VGA display interface is located is not required to provide a power supply, so that whether the electronic equipment where the VGA display interface is located is in a power-on state or a power-off state, whether a VGA cable is connected to the VGA display interface or not can be detected.
In the plug detection method 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 plugging 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 plugging 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 plug detection method 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 plugging 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 plugging 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 plugging and unplugging of a VGA display interface according to an embodiment of the present invention, the system for detecting plugging and unplugging of a VGA display interface further includes an inverted and gate, the first pin and the second pin are respectively connected to an input end of the inverted and gate, an output end of the inverted and gate is connected to an input end of the signal processing module, and the signal processing module is provided with a plugging signal output port;
when the switching value signal output by the inverse AND gate is a low level signal, the plugging 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 plugging 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 the system for detecting insertion and removal of a VGA display interface described in the embodiment of the first aspect.
According to the electronic equipment provided by the embodiment of the invention, at least the following beneficial effects are achieved: the plugging detection system pulls up the electric potentials of the first pin and the second pin to a 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 a VGA cable is connected into a VGA display interface, because two pins corresponding to the first pin and the second pin of a commercial standard VGA cable are both connected to a shielding ground, the electric potentials of the first pin and the second pin are pulled down to a low level, so that 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 the potential signals of the first pin and the second pin; on the premise of not generating information interaction, whether a VGA cable is connected to a VGA display interface or not can be detected; in addition, the potential pull-up circuit is independently arranged, so that the electronic equipment where the VGA display interface is located does not need to provide a power supply, and whether the electronic equipment where the VGA display interface is located is in a power-on state or a power-off state or not can be detected whether a VGA cable is connected to the VGA display interface or not.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where computer-executable instructions are stored, and the computer-executable instructions are configured to enable a computer to execute the method for detecting plugging and unplugging 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 present invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and do not constitute a limitation thereof.
The invention is further described below with reference to the accompanying 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 plugging detection system of a VGA display interface according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a plugging detection system of a VGA display interface according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a plugging detection system of a VGA display interface according to still another embodiment of the present invention;
fig. 5 is a flowchart of a method for detecting plugging/unplugging 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 preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, if there are first and second described only for the purpose of distinguishing technical features, it is not understood that relative importance is indicated or implied or that the number of indicated technical features or the precedence of the indicated technical features is implicitly indicated or implied.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
The embodiment of the invention provides a system and a method for detecting plugging and unplugging of a VGA display interface and electronic equipment, which can detect whether a VGA cable is connected to the VGA display interface or not on the premise of not generating information interaction.
The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 1, a first embodiment of the present invention provides a plugging detection system for a VGA display interface, where the VGA display interface includes a first pin 100 and a second pin 200 in a floating state or in a high impedance state, and the plugging detection system includes:
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, the first pin 100 and the second pin 200, are used for judging whether there is a VGA cable to access 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 plugging detection system of the VGA display interface provided in the embodiment of the present invention, the electric potentials of the first pin 100 and the second pin 200 are pulled up to the high level by setting the electric potential pull-up circuit 300, and 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 signal processing module 500; when a VGA cable is connected to the VGA display interface, since two pins corresponding to the first pin 100 and the second pin 200 of the commercial standard VGA cable are both connected to the shielding ground, the 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 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; on the premise of not generating information interaction, whether a VGA cable is connected to a VGA display interface or not can be detected; in addition, because the potential pull-up circuit 300 is independently arranged, the electronic equipment where the VGA display interface is located does not need to provide power, and therefore whether the electronic equipment where the VGA display interface is located is in a power-on state or a power-off state or not can be detected whether a VGA cable is connected to the VGA display interface or not.
The plug-in detection system of the VGA display interface can be matched with a port-controlled physical blocking technology and a port authentication authorization technology, detect the peripheral plug-in situation of the VGA display interface before the information of the electronic equipment is transmitted to the external equipment, control the port access at a physical layer and defend against unauthorized peripheral in advance. Specifically, 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, an external information channel of a VGA display interface of the electronic equipment is cut off on 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 on the physical layer. The controlled physical blocking system can set a switch module on an information transmission connecting line between the VGA display interface and an internal device of the electronic equipment, and controls the switch module according to an output signal of a signal processing module of the plug-pull detection system 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 effect that the information channel of the VGA display interface is only open to authorized peripherals, namely only information is transmitted to the authorized peripherals is realized. It is well understood that blocking at the physical layer can prevent hackers from stealing information in electronic devices by cracking the VGA display interface. Under the condition that the authorized peripheral is pulled out or the unauthorized peripheral is accessed to the VGA display interface, the VGA display interface is blocked at the physical layer, so that the conduction and the leakage of the electrical interface can be avoided, and the information leakage caused by the interception and restoration of the digital signal of the display port can be prevented. It is also easy to understand that the plug detection system of VGA display interface provided in the embodiments of the present invention, in combination with the port controlled physical blocking technology and the port authentication authorization technology, not only can prevent unauthorized peripheral devices from acquiring information of electronic devices according to the authentication result, but also can enable users to find out in time whether the peripheral devices are replaced or not, and prevent others from replacing the peripheral devices at will, for example, for a secure computer of the plug detection system equipped with the VGA display interface, the secure computer is equipped with a secure display, the secure display can have functions of off-position screen protection, anti-peeping, anti-candid, anti-window detection, the secure display is set as an authorized peripheral device, is allowed to access the VGA display interface of the secure computer and read image information from the secure computer, and when other displays are accessed into the VGA display interface of the secure computer, image information cannot be acquired, if this peep-proof screen display shows the ware and is replaced ordinary display, this owner of crypto computer can in time discover when using, and the plug incident can be by the record, can make this type of spy's action leave the clue, helps pursuing about the spy afterwards. In addition, the confidential computer is matched with the authorized display, so that a user can obtain 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 obtained by the unauthorized display at the first time, and the confidentiality and the safety in the confidential computer are improved to a certain extent.
Those skilled in the art should further understand that, at present, some electronic devices connected to a display signal source with scrambling can weaken or eliminate scrambling strength, so that a thief can receive and restore display information through electromagnetic radiation and steal confidential information, and the plug-pull detection system of the VGA display interface provided in the embodiment of the present invention can match with a controlled physical blocking technology and an authentication and authorization technology, so as to prevent the scrambling strength of the port of the electronic device from being weakened or eliminated by such illegal peripherals, and enhance defense capability. In addition, in order to prevent electromagnetic radiation and electromagnetic reconstruction of the display, a video interference unit can be connected between the electronic device and the display at present, and the VGA display interface plug-pull detection system can detect illegal operations such as removal and bypass of the video interference unit, so that the risk of disclosure 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 system for detecting plugging/unplugging of a VGA display interface according to an embodiment of the present invention, the potential pull-up circuit 300 includes a dc power source terminal Vcc, a first resistor R1 and a second resistor R2, the dc power source terminal Vcc is connected to the first pin 100 through the first resistor R1, and the dc power source terminal Vcc is connected to the second pin 200 through the second resistor R2.
By setting the direct current power supply terminal Vcc, the direct current power supply terminal Vcc is connected to the first pin 100 through the first resistor R1 so as to pull up the potential of the first pin 100 to a high level; the dc power source terminal Vcc is connected to the second pin 200 through the second resistor R2 to pull up the potential of the second pin 200 to a high level.
Referring to fig. 2, the system for detecting insertion and extraction of a VGA display interface according to an embodiment of the present invention further includes an or gate 400, wherein 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, and 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 signal output by the or gate 400 is also a high level signal; when a VGA cable is connected to the VGA display interface, because two pins corresponding to the first pin 100 and the second pin 200 of the VGA cable are both connected to the shielding ground, the 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 from the first pin 100 and the second pin 200 are low level signals, and further the switching value signal output by the or gate 400 is also a low level signal; finally, the signal processing module 500 is connected with the output end of the or gate 400 to obtain the switching value signal output by the or gate 400, so as to judge whether a VGA cable is accessed to the VGA display interface according to the switching value signal output by the or gate 400; on the premise of not generating information interaction, whether a VGA cable is connected to a VGA display interface or not can be detected.
Referring to fig. 2, in the plug detection system of VGA display interface according to an embodiment of the present invention, 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 plugging signal output port 510 outputs a second signal indicating 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 plug signal output port 510 outputs a first signal indicating that no VGA cable is connected to the VGA display interface.
The plugging signal output port 510 is configured to output a first signal and a second signal, and then prompt or respond to a control operation 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 received first signal; if no authorization or untrusted peripheral equipment is inserted, the VGA display interface is kept in a blocking state even if the second signal is received, the outward channel of the sensitive information of the computer is cut off, the leakage of the sensitive information is avoided, and the effect of secret advance defense is achieved.
It can be understood that the plugging detection system senses and detects the plugging and unplugging operations of the external device of the VGA display interface, records and outputs a plugging detection signal through the plugging signal output port 510; the plugging detection signal can be processed, and the VGA display interface of the computer is completely controlled by combining the controlled physical blocking, physical isolation and port authentication and authorization operations of the port of the computer, so that the leakage of sensitive information is avoided.
Referring to fig. 3, in the system for detecting insertion and extraction of a VGA display interface according to another embodiment of the present invention, the 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 of 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 nor gate 700 is used to process the level signals of the first pin 100 and the second pin 200, so that the same control effect can be obtained.
Referring to fig. 4, in the system for detecting insertion and extraction of a VGA display interface according to another embodiment of the present invention, an inverse and gate 800 is further included, the first pin 100 and the second pin 200 are respectively connected to an input terminal of the inverse and gate 800, and an output terminal of the inverse and gate 800 is connected to an input terminal of the signal processing module 500.
Unlike the embodiment of 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 and the embodiment of fig. 3 in which the nor gate 700 is used to process the level signals of the first pin 100 and the second pin 200, the present embodiment uses the inverse and gate 800 to process the level signals of the first pin 100 and the second pin 200, and thus the same control effect can be obtained.
It is understood that in the present application, other digital logic circuits may be used to process the level signals of the first pin 100 and the second pin 200, as long as the same control effect can be achieved.
Referring to fig. 1, fig. 2 or fig. 3, in the system for detecting insertion and extraction of a VGA display interface according to an embodiment of the present invention, the VGA display interface employs 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 signal definition of the VGA display interface source terminal (computer VGA display output port) DB15 connector defined by the VGA (D-SUB) display interface standard of VESA (video electronics standard association), the 4 th Pin (Pin 4) is the third bit ID2 in the 4-bit address code ID signals (ID 0 to ID 3), and this signal is usually not connected or reserved, i.e., in a floating or high impedance state, in the actual design and use of the computer display interface. The 11 th Pin11 is the first ID0 of the 4-bit ID signal (ID 0-ID 3), which is usually not connected or reserved, i.e., floating or high impedance, in the actual design and use of the computer display interface.
In addition, in the DB15 connector signal definition of the standard commercial VGA cable, the 4 th Pin (Pin 4), the 5 th Pin (Pin 5 signal ground), the 6 th Pin (Pin 6), the 7 th Pin (Pin 7), the 8 th Pin (Pin 8), and the 11 th Pin (Pin 11) are short-circuited with the connector housing (shield ground).
The idea of the embodiment of the present invention is to pull up a 4 th Pin (Pin 4) ID2 signal and an 11 th Pin (Pin 11) ID0 signal of a connector signal of a VGA display output port DB15 of a computer to Vcc (+ 5V) respectively in a plug detection system, and then perform a logical or operation on the two signals, so as to output a switching value signal for plug detection from an output terminal of an or gate. The practical effect that as long as there is a VGA display interface of the computer into which the VGA cable is inserted, as the Pin4, the Pin11 and the ground of the VGA cable are short-circuited, one or both of the ID2 signal of the 4 th Pin (Pin 4) and the ID0 signal of the 11 th Pin (Pin 11) of the VGA display interface are pulled low, and the switching value signal can generate level jump from high to low; when a VGA cable is pulled out of a VGA display interface of a computer, because a 4 th Pin (Pin 4) ID2 signal and an 11 th Pin (Pin 11) ID0 signal of the VGA display interface are pulled high at the same time, a switching value signal can generate level jump from low to high; then, the switching value signal is processed by the signal processing module 500, and a VGA display device and a cable plugging event thereof are generated and output.
In the system for detecting insertion and extraction of 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 it can process the level signal of the first pin 100, the second pin 200 or the switching value signal output by the or gate 400.
Referring to fig. 1, the system for detecting insertion and extraction of a VGA display interface according to an embodiment of the present invention further includes a power management module 600, and the power management module 600 is connected to the signal processing module 500.
It can be understood that, by providing the power management module 600 to supply power to the signal processing module 500, it can be ensured that the plug detection system can still work normally when the electronic device is powered off or shut down. The structure of the power management module 600 is not specifically limited in this embodiment, as long as the power management module can supply power to the signal processing module 500 of the plugging detection system.
In addition, referring to fig. 5, a second aspect embodiment of the present invention provides a method for detecting plugging and unplugging of a VGA display interface, which is applied to a signal processing module 500 in a plugging and unplugging 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 floating state or in a high impedance state, and the plugging and unplugging detection system further includes a potential pull-up circuit 300; the potential pull-up circuit 300 is respectively connected to the first pin 100 and the second pin 200, and is configured to pull up 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 end 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 a first pin 100 and a second pin 200;
step S520: and judging whether a VGA cable is connected to a VGA display interface or not according to the potential signals of the first pin 100 and the second pin 200.
According to the plug detection method of the VGA display interface provided in the embodiment of the present invention, the plug detection system of the VGA display interface is configured with the electric potential pull-up circuit 300 to pull up the electric potentials of the first pin 100 and the second pin 200 to a high level, and 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 signal processing module 500; when a VGA cable is connected to the VGA display interface, because two pins corresponding to the first pin 100 and the second pin 200 of the VGA cable are both connected to the shielding ground, the 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 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; on the premise of not generating information interaction, whether a VGA cable is connected to a VGA display interface or not can be detected; in addition, because the plugging 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 a power supply, and therefore whether the electronic equipment where the VGA display interface is positioned is in a power-on state or a power-off state or not can be detected whether a VGA cable is connected to the VGA display interface or not.
After the VGA cable is plugged into the VGA display interface, the electric potential of the first pin 100 and the electric potential of the second pin 200 are both at low level, so that the high level of one of the two pins is a sufficient condition for detecting the VGA cable being plugged out from the VGA display interface, and the low level of the two pins is a sufficient necessary condition for detecting the VGA cable being plugged into the VGA display interface.
Therefore, in the step S520, whether there is a VGA cable accessing the VGA display interface is determined 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, determining that no VGA cable is connected to the VGA display interface;
when the potential of the first pin 100 and the potential of the second pin 200 are at low level at the same time, it is determined that a VGA cable is connected to the VGA display interface.
In the plug detection method 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 an input end of the or gate 400, an output end of the or gate 400 is connected to an 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 plugging signal output port 510 outputs a second signal indicating 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 plug signal output port 510 outputs a first signal indicating that no VGA cable is connected to the VGA display interface.
In the plug detection method 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 an input end of the nor gate 700, an output end of the nor gate 700 is connected to an 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 plugging signal output port 510 outputs a second signal indicating 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 plug signal output port 510 outputs a first signal indicating that no VGA cable is connected to the VGA display interface.
In the plug detection method 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 inverted and gate 800, the first pin 100 and the second pin 200 are respectively connected to an input end of the inverted and gate 800, an output end of the inverted and gate 800 is connected to an 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 plugging signal output port 510 outputs a second signal indicating that a VGA cable is connected to the VGA display interface;
when the switching value signal output by the nand gate 800 is a high level signal, the plug signal output port 510 outputs a first signal indicating 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, which includes the insertion and extraction detection system for a VGA display interface as described in the embodiment of the first aspect.
According to the electronic device provided by the embodiment of the present invention, the plugging detection system sets the potential pull-up circuit 300 to pull up the potentials of the first pin 100 and the second pin 200 to a high level, 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 a VGA cable is connected to the VGA display interface, since two pins corresponding to the first pin 100 and the second pin 200 of the commercial standard VGA cable are both connected to the shielding ground, the 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 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; on the premise of not generating information interaction, whether a VGA cable is connected to a VGA display interface or not can be detected; in addition, because the potential pull-up circuit 300 is independently arranged, the electronic equipment where the VGA display interface is located does not need to provide power, and therefore whether the electronic equipment where the VGA display interface is located is in a power-on state or a power-off state or not can be detected whether a VGA cable is connected to the VGA display interface or not.
In addition, a fourth aspect embodiment of the present invention provides a computer-readable storage medium, where computer-executable instructions are stored, and the computer-executable instructions are configured to enable a computer to execute the method for detecting plugging and unplugging of a VGA display interface according to the second aspect embodiment, for example, execute the method steps S510 to S520 in fig. 5.
It will be understood by those of ordinary skill in the art that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, or 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 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 is well known to those of ordinary skill 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 disks, 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 accessed by a computer. In addition, 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 as known to those skilled in the art.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (15)
1. The utility model provides a VGA shows plug detecting system of interface, its characterized in that, VGA shows the interface and includes first pin and the second pin that is in unsettled state or is in the high impedance 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 the potentials of the first pin and the second pin up to a high level;
the input end of the signal processing module is connected with the first pin and the second pin and 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;
wherein:
the VGA cable is a commercial standard VGA cable, and two pins corresponding to the first pin and the second pin of the VGA cable are both connected to a shielding ground.
2. The system for detecting the plugging and unplugging of a VGA display interface of claim 1, wherein the potential pull-up circuit comprises 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.
3. The system according to claim 1, further comprising an or gate, wherein the first pin and the second pin are respectively connected to an input terminal of the or gate, and an output terminal of the or gate is connected to an input terminal of the signal processing module.
4. The system for detecting the plugging of the VGA display interface according to claim 3, wherein the signal processing module is provided with a plugging signal output port;
when the switching value signal output by the OR gate is a low level signal, the plugging 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 plugging signal output port outputs a first signal, and the first signal indicates that no VGA cable is connected to the VGA display interface.
5. The system according to claim 1, further comprising a nor gate, wherein the first pin and the second pin are respectively connected to an input terminal of the nor gate, and an output terminal of the nor gate is connected to an input terminal of the signal processing module.
6. The system according to claim 1, further comprising an inverting and gate, wherein the first pin and the second pin are respectively connected to an input terminal of the inverting and gate, and an output terminal of the inverting and gate is connected to an input terminal of the signal processing module.
7. The system for detecting the plugging and unplugging of the VGA display interface according to claim 1, wherein the VGA display interface adopts a D-Sub interface, and the first Pin and the second Pin are a Pin4 Pin and a Pin11 Pin of the D-Sub interface respectively.
8. The system for detecting the plugging and unplugging of the VGA display interface of claim 1, wherein the signal processing module is a processor, a logic circuit or a programmable logic device.
9. The system for detecting the plugging of the VGA display interface of claim 1, further comprising a power management module, wherein the power management module is connected with the signal processing module.
10. A plug detection method of a VGA display interface is characterized in that the plug detection method is applied to a signal processing module in a plug detection system of the VGA display interface, the VGA display interface comprises a first pin and a second pin which are in a suspended state or a high-impedance state, and the plug detection system further comprises a potential pull-up circuit; the potential pull-up circuit is respectively connected with the first pin and the second pin and used for pulling the potentials of the first pin and the second pin up 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;
and 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.
11. The method for detecting the plugging of the VGA display interface according to claim 10, further comprising an or gate, wherein 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 plugging signal output port;
when the switching value signal output by the OR gate is a low level signal, the plugging 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 plugging signal output port outputs a first signal, and the first signal indicates that no VGA cable is connected to the VGA display interface.
12. The method according to claim 10, further comprising a nor gate, wherein the first pin and the second pin are respectively connected to an input terminal of the nor gate, an output terminal of the nor gate is connected to an input terminal of the signal processing module, and the signal processing module is provided with a plugging signal output port;
when the switching value signal output by the NOR gate is a high level signal, the plugging 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 plugging signal output port outputs a first signal, and the first signal indicates that no VGA cable is connected to the VGA display interface.
13. The method for detecting the plugging and unplugging of the VGA display interface according to claim 10, further comprising an inverted AND gate, wherein the first pin and the second pin are respectively connected to an input end of the inverted AND gate, an output end of the inverted AND gate is connected to an input end of the signal processing module, and the signal processing module is provided with a plugging signal output port;
when the switching value signal output by the inverse AND gate is a low level signal, the plugging 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 plugging signal output port outputs a first signal, and the first signal indicates that no VGA cable is connected to the VGA display interface.
14. An electronic device, characterized in that it comprises a system for detecting the plugging of a VGA display interface according to any one of claims 1 to 9.
15. A computer-readable storage medium storing computer-executable instructions for causing a computer to perform the method for detecting insertion/extraction of a VGA display interface as recited in any one of claims 10 to 13.
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