CN111796755B - KVM control system and KVM display switching control method - Google Patents
KVM control system and KVM display switching control method Download PDFInfo
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
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- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
- G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
- G06F3/04886—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures by partitioning the display area of the touch-screen or the surface of the digitising tablet into independently controllable areas, e.g. virtual keyboards or menus
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Abstract
The application relates to a KVM control system and a KVM display switching control method, which relate to the field of computer control and comprise host display interfaces, a keyboard, a mouse and a keyboard controller, wherein the host display interfaces are used for connecting a host and are at least two in number; a display interface for connecting a display; the main control MCU is used for collecting display response information output by the display interface based on the received reading operation signal; the master control MCU acquires audio and video data output by the selected host display interface based on the received switching operation signal and outputs the audio and video data to the display interface; the virtual machine chip acquires and stores the display response information read by the main control MCU, and replies the inquiry of the host connected to the host display interface through the response pin group based on the display response information; the reading trigger piece is used for outputting reading operation information to the master control MCU; and the switching trigger is used for outputting switching operation information to the master control MCU. The method and the device have the effect that the display content of the display is consistent before and after switching.
Description
Technical Field
The present invention relates to the field of computer control, and in particular, to a KVM control system and a KVM display switching control method.
Background
A KVM switch is one of the commonly used switches. Wherein KVM is an abbreviation of Keyboard (Keyboard), display (Video), Mouse (Mouse). Simply, a KVM switch allows a system administrator to control multiple servers or computer peripherals of a computer host through a set of keyboard, mouse, and display.
Chinese patent publication No. CN110888538A discloses a KVM switch circuit and a switcher, wherein the switch circuit includes a plurality of Type-C connectors, a CC control module, a signal switching/synchronizing module, at least two input device interfaces, and a plurality of different types of communication interfaces; the Type-C connector is used for connecting the host equipment to realize bidirectional communication between the signal switching/synchronizing module and the host equipment; the signal switching/synchronizing module can detect a control signal of the input equipment through the input equipment interface; the signal switching/synchronizing module is used for obtaining a mixed signal output by the host equipment according to the communication connection between the control signal and the corresponding host equipment, and separating the mixed signal to obtain various different types of communication signals.
Similar to the KVM switch described above, the conventional KVM switch generally includes two display interfaces for connecting to displays, and after the host computer is switched, one of the two displays serves as a main screen, and the other serves as an expansion screen for displaying the contents of the host computer. However, after the host is switched, the contents on the expansion screen disappear, the expansion screen is moved to the main screen, and the display contents of the display before and after switching are inconsistent.
Disclosure of Invention
In order to make the display contents of the displays consistent before and after switching, the present application provides a KVM control system and a KVM display switching control method.
The KVM control system provided by the application adopts the following technical scheme:
in a first aspect, the present application provides a KVM control system, which adopts the following technical solutions:
a KVM switch system, comprising:
the host display interface is used for connecting a host and comprises an input pin group for unidirectionally inputting audio and video streams and a response pin group for bidirectionally transmitting response signals;
a display interface for connecting a display;
the main control MCU is used for collecting display response information output by a display on a display interface based on the received reading operation signal; the master control MCU acquires audio and video data output by the selected host display interface based on the received switching operation signal and outputs the acquired audio and video data to a display connected with a display interface;
the virtual machine chip is connected with the response pin group and the main control MCU of the host display interface, acquires and stores the display response information read by the main control MCU, and responds to the inquiry of the host connected to the host display interface through the response pin group based on the display response information;
the reading trigger piece is used for outputting reading operation information to the master control MCU;
and the switching trigger is used for outputting switching operation information to the master control MCU.
By adopting the technical scheme, the reading trigger sends a reading operation signal to the main control MCU, and the main control MCU can write the display response information into the virtual machine chip. Since the virtual machine chip stores the display response information and the virtual machine chip is connected to the response pin group of the host display interface, the virtual machine chip can respond to the inquiry from the response pin group on the host interface in real time based on the display response information. Therefore, the host connected on the host display interface can be in the state of continuously connecting the display no matter whether the host is in the state of being switched to the display or not. Therefore, the content of the switched display cannot be changed, and the user experience is consistently improved.
Preferably, the host display interface and the display interface are VGA interfaces, DVI interfaces or HDMI interfaces.
Preferably, the input pin set includes a TMS channel, and the response pin set includes a DDC channel, an I2C channel, and an HPD channel.
By adopting the technical scheme, the TMS channel is used for sending audio, video and various auxiliary data. The DDC channel is used to establish an information channel between the host and the display, the I2C channel is used to establish an information channel between the host and the display, and the HPD channel is used to obtain hot plug information of the display.
Preferably, the reading trigger and the switching trigger are mechanical key triggers or virtual key triggers.
By adopting the technical scheme, the mechanical key trigger or the virtual key trigger can acquire manual operation and convert the operation information into operation information to be transmitted to the main control MCU.
Preferably, the virtual machine chips are arranged corresponding to the host display interfaces, so that the response pin group of each host display interface is correspondingly connected with one virtual machine chip, and the virtual machine chips are connected with the master control MCU.
By adopting the technical scheme, because one virtual machine chip is correspondingly arranged on each host display interface to serve as a virtual display, the number of pins and the calculation amount required by each virtual machine chip are small, the real-time response to the inquiry of the computer host can be realized, and the cost of a plurality of small chips with small number of pins is lower than that of a large chip with large number of pins.
In a second aspect, the present application provides a KVM display switching control method, which adopts the following technical solutions:
a KVM display switching control method comprises the following steps:
based on the received reading operation information, acquiring display response information output by a display connected to a display interface, and respectively writing the acquired display response information into a virtual machine chip connected to a host display interface; causing the virtual machine chip to reply to a query of a host connected to the host display interface based on the display response information;
and based on the received switching operation information, acquiring audio and video data output by the host on a host display interface corresponding to the switching operation information, and outputting the acquired audio and video data to a display connected with a display interface.
By adopting the technical scheme, the display response information is written in the virtual machine chip, and the virtual machine chip is connected to the response pin group of the host display interface, so that the virtual machine chip can respond to the inquiry from the response pin group on the host interface in real time. Therefore, for the display response information obtained from the response pin group by the computer host connected to the host display interface, the computer host is continuously connected to the virtual display formed by the virtual machine chip. And the virtual display formed by the virtual machine chip can not change along with the audio and video data output by the host machine on the display interface of the host machine switched in the host machine switching step. The content of the main screen and the extended screen can be kept unchanged under continuous switching.
Preferably, the display response information includes HPD data and EDID data, and the virtual machine chip replies to the HPD data and the EDID data based on an inquiry of the host on the host display interface.
By adopting the technical scheme, EDID (extended Display indication Data Standard) and Chinese name extension Display identification Data are adopted; HPD (Hot Plug detect), Chinese name hot Plug detect; therefore, both the HPD data and the EDID data are response information that affects the display of the display.
Preferably, the display response message includes HDPC data, and the virtual machine chip replies to the HDPC data based on an inquiry of the host on the host display interface.
By adopting the technical scheme, the HDCP (High-bandwidth Digital Content Protection) technology is a High-bandwidth Digital Content Protection technology with a Chinese name. HDCP technology protects the entire transmission of audiovisual content. The safety of data transmission is improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. writing display response information in the virtual machine chip, and connecting the virtual machine chip to a response pin group of a host display interface; the content of the main screen and the extended screen can be kept unchanged under continuous switching.
2. And a virtual machine chip is correspondingly arranged on each host display interface to serve as a virtual display, so that the number of pins and the calculation amount required by each virtual machine chip are small, the overall cost is saved, and the calculation capability is accelerated.
Drawings
FIG. 1 is a schematic diagram of a KVM switch system according to the present application.
FIG. 2 is a flowchart illustrating an initialization procedure of the KVM switch display screen switching method according to the present application.
FIG. 3 is a flowchart illustrating a host switch procedure in the KVM switch panel switch of the present application.
Description of reference numerals: 1. a host display interface; 11. inputting a pin group; 12. a group of response pins; 2. a display interface; 3. a virtual machine chip; 4. a main control MCU; 5. reading a trigger; 6. and switching the trigger piece.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
A KVM switch is one of the commonly used switches. Wherein KVM is an abbreviation of Keyboard (Keyboard), display (Video), Mouse (Mouse). Simply, a KVM switch allows a system administrator to control multiple servers or computer peripherals of a computer host through a set of keyboard, mouse, and display.
The conventional KVM switch generally comprises two monitor interfaces 2 for connecting to the monitor and a plurality of host monitor interfaces 1 for connecting to the host. After the two display interfaces 2 are connected with the displays, one display serves as a main screen, and the other display serves as an expansion screen to respectively display audio and video data input to the host display interface 1 by the computer host. Meanwhile, the switching mode of the display interface 1 of the existing host generally adopts a switching mode, so that the display interface 1 and the display interface 2 corresponding to the computer host to be operated realize data connection, and the display can display the video information output by the computer host.
The content displayed by the display is switched from one computer host to another computer host by adopting a switching mode. When the display content of the display is switched from one computer host to another computer host, the display content of the switched computer host and the previously displayed content are changed. Such as content on the expansion screen displayed on the home screen.
The reason why the content on the extended screen is displayed on the main screen is mainly that when the KVM switch adopts a switch switching mode to connect the display interface 2 with the other host display interfaces 1, the original host display interface 1 is disconnected from the display interface 2, the extended screen belongs to the extended display content, and when the extended screen is disconnected, the computer host can automatically move all the extended display content to the main screen; and after the KVM switcher is switched back, the content on the main screen can not automatically move to the expanded screen, so that the content on the expanded screen is displayed on the main screen, and the experience of the customer on the practical KVM switcher is greatly influenced. The above problem cannot be solved only by using simple switching.
Therefore, in order to solve the problem that the content on the extended screen is displayed on the main screen due to the switching back after the host is switched, the embodiment of the present application discloses a KVM switch system, as shown in fig. 1, which includes a display interface 1 for the host, a display interface 2, a virtual machine chip 3, a main control MCU4, a read trigger 5, and a switch trigger 6.
The host display interface 1 is used for connecting a computer host to acquire a response signal and an audio/video signal output from the computer host. The number of the host display interfaces 1 in the KVM switch is at least two, and in this embodiment, 4 host display interfaces 1 are adopted. However, generally, the number of the host display interfaces 1 is not limited according to different requirements. Further, in the present embodiment, the pins of the host display interface 1 are divided according to the functions in the host display interface 1, so that the host display interface 1 includes an input pin group 11 for unidirectionally inputting audio/video streams and a response pin group 12 for bidirectionally transmitting a response signal. The input pin group 11 is connected to the main control MCU4, and the response pin group 12 is connected to the virtual machine chip 3.
The number of the display interfaces 2 is two, the display interfaces 2 are used for connecting a display, the display interfaces 2 are connected to the main control MCU4, and the display interfaces can receive and display audio and video data output from the main control MCU4 while sending response information to the main control MCU 4.
The number of the virtual machine chips 3 is the same as that of the host display interfaces 1, and the virtual machine chips 3 are respectively arranged corresponding to the host display interfaces 1, so that the response pin group 12 of each host display interface 1 is correspondingly connected with one virtual machine chip 3, and all the virtual machine chips 3 are connected with the master control MCU4, receive the display response information read by the master control MCU4 and store the display response information. The virtual machine chip 3 is configured to have a virtual display connected to the response pin group 12 of the host display interface 1, and to enable the virtual machine chip 3 to respond to a query of a host connected to the host display interface 1 based on display response information.
The master control MCU4 is respectively in communication connection with the reading trigger 5, the switching trigger 6, the host display interface 1, the display interface 2 and the virtual machine chip 3. The master MCU4 receives the read operation information output by the read trigger 5 and the switch trigger 6 outputs the switch operation information. The main control MCU4 collects the display response information output by the display connected to the display interface 2 based on the received read operation signal, and writes the collected display response information into the virtual machine chip 3 connected to the host display interface 1; the main control MCU4 obtains the audio/video data output by the selected host display interface 1 based on the received switching operation signal, and outputs the obtained audio/video data to the display connected to the display interface 2.
The reading trigger 5 and the switching trigger 6 receive external triggers and send reading operation signals and switching operation signals to the main control MCU4, in this embodiment, the reading trigger 5 and the switching trigger 6 both use keys, but in other embodiments, the reading trigger 5 and the switching trigger 6 may also be switches, touch screens, and other devices capable of receiving artificial external trigger signals.
Further, the display interface 2 and the host display interface 1 may be any one of VGA, DVI and HDMI interfaces. Meanwhile, in order to clarify the difference between the input pin group 11 and the response pin group 12 in the host display interface 1, the host display interface 1 takes the HDMI D Type as an example, and 19 pin definition tables 1 of the HDMI D Type are shown in table 1:
| Pin | definition of Pin |
| 1 | |
| 2 | |
| 3 | TMDS Data2– |
| 4 | |
| 5 | TMDS Data1+ |
| 6 | TMDS Data1– |
| 7 | TMDS Data0 Shield |
| 8 | TMDS Data0+ |
| 9 | TMDS Data0– |
| 10 | |
| 11 | |
| 12 | TMDS Clock– |
| 13 | DDC/CEC Ground |
| 14 | CEC |
| 15 | SCL |
| 16 | SDA |
| 17 | Reserved（N.C. on device） |
| 18 | +5V Power |
| 19 | Hot Plug Detect |
TABLE 1
As known to those skilled in the art, the 1-12 pins in the HDMI D Type are TMS channels for transmitting audio, video and various auxiliary data. The pins 13 to 19 in the HDMI D Type include a DDC channel for establishing an information channel between the host and the display, a CEC channel as a reserved pin, an I2C channel for establishing an information channel between the host and the display, a VCC pin for providing a reference high level, and an HPD channel for acquiring hot plug information of the display. Therefore, when the host display interface 1 is HDMI D Type, the input pin set 11 has pins 1 to 12, and the response pin set 12 has pins 13 to 19.
In addition, when the two display interfaces 2 are connected with the displays at the same time, after the main control MCU4 receives the reading operation information output by the reading trigger 5, the main control MCU4 acquires the display response information from the two display interfaces 2, and according to the order of acquiring the display response information, the display that acquires the display response information first is used as the main screen, and then the display that acquires the display response information is used as the expansion screen, so that the two displays jointly display the audio and video data input from the designated host computer to the host display interface 1. The main control MCU4 also writes the display response information into each virtual machine chip 3, so that each virtual machine chip 3 replies the inquiry information output by the corresponding host display interface 1 based on the display response information obtained by this reading operation. Therefore, the sequence of the main screen and the expansion screen of the two display screens can not be changed before the next reading operation information output by the trigger 5 is read again.
The virtual machine chip 3 is a single chip microcomputer with a flash memory function, and has independent operation and storage capabilities, so that the virtual machine chip 3 can store display response information and can respond to an inquiry from the response pin group 12 on the host interface based on the display response information. Meanwhile, in the scheme, because one virtual machine chip 3 is correspondingly arranged on each host display interface 1 to serve as a virtual display, the number of pins and the calculation amount required by each virtual machine chip 3 are small, the cost of a plurality of small chips with small number of pins is lower than that of a large chip with large number of pins while the inquiry of the computer host can be responded in real time.
The embodiment of the present invention provides a method for switching a display screen of a KVM switch, including an initialization step of collecting display response information output by a display and a host switching step of switching a display host on the display, specifically including:
as shown in fig. 2, the initialization step:
s11, the main control MCU4 collects display response information output by a display connected with the display interface 2 based on the received reading operation information;
the reading operation information can be obtained by a mechanical key triggering mode or a virtual key triggering mode; the mechanical key triggering mode can obtain the current behavior information by pressing the corresponding triggering key again after starting up; the virtual key triggering mode can be achieved by pressing the relevant virtual triggering key in the interface of the corresponding software. In this embodiment, the reading trigger 5 is a key. Thus, manually by pressing the read trigger 5, the master MCU4 is enabled to collect the display response information from the display connected to the display interface 2.
The display response information at least includes edid (extended display indication Data standard) and hpd (hot Plug detect), and in some embodiments, may also include HDCP (High-bandwidth Digital Content Protection).
EDID (extended Display identification Data standard), the extended Display identification Data with chinese name, EDID (a standard related to the Display identification Data established when VESA establishes DDC Display Data channel communication protocol) is stored in the DDC memory in the Display, and when the main control MCU4 is connected with the Display, the main control MCU4 reads and collects the EDID Data stored in the DDC memory through the DDC channel.
HPD (Hot Plug detect), Chinese name hot Plug detect. The hot plug detection is used for detecting the event through the HPD pin and responding when the display is connected or disconnected with the host computer through the interface. In this embodiment, the HPD data is a detection signal from the display output to the master MCU 4.
HDCP (High-bandwidth Digital Content Protection), the chinese name High bandwidth Digital Content Protection technique. HDCP technology protects the entire transmission of audiovisual content. In the whole transmission process, a transmitting end and a receiving end supporting the HDCP store an available key set, the keys are stored secretly, and the transmitting end and the receiving end carry out encryption and decryption operation according to the keys. A special value, KSV (Key Selection Vector), is also added to the encryption and decryption operations. Each device supporting the HDCP has a unique KSV serial number, and the cryptographic processing units of the transmitting end and the receiving end check the KSV value of the other end to determine that the connection is legal. Thus for a display that supports HDCP, master MCU4 would collect the display's KSV value from display interface 2.
S12, the main control MCU4 writes the collected display response information into the virtual machine chip 3 connected with the host display interface 1 respectively;
because the main control MCU4 writes the collected display response information into each virtual machine chip 3, because the number of the virtual machine chips 3 is the same as that of the host display interface 1, and each virtual machine chip 3 is connected to the response pin group 12 corresponding to the host display interface 1, each host display interface 1 is equal to the virtual display connected to the same display response information as that of the display interface 2.
S13, the virtual machine chip 3 responds to the inquiry of the host connected to the host display interface 1 based on the display response information.
Specifically, since the virtual machine chip 3 stores the display response information and the virtual machine chip 3 is connected to the response pin group 12 of the host display interface 1, the virtual machine chip 3 can respond to the inquiry from the response pin group 12 on the host interface in real time based on the display response information. Therefore, the host connected to the host display interface 1 is in a state of being continuously connected to the display regardless of whether the host is in a state of being switched to the display.
As shown in fig. 3, the host switching step:
s21, the main control MCU4 obtains the audio and video data output by the host computer on the host computer display interface 1 corresponding to the switching operation information based on the received switching operation information;
the switching operation information can be acquired by a mechanical key triggering mode or a virtual key triggering mode; triggering the key to acquire the current behavior information in a mechanical key triggering mode; the virtual key triggering mode can be achieved by pressing the relevant virtual triggering key in the interface of the corresponding software. In this embodiment, the reading trigger 5 is a key. Therefore, manually by pressing the switching trigger 6, the main control MCU4 obtains the audio/video data output by the host on the host display interface 1 corresponding to the switching operation information through the input pin group 11.
And S22, the main control MCU4 outputs the acquired audio and video data to a display connected with the display interface 2.
In summary, in the method, in the initialization step, the display response information is written in the virtual machine chip 3, and the virtual machine chip 3 is connected to the response pin group 12 of the host display interface 1, so that the virtual machine chip 3 can respond to the inquiry from the response pin group 12 on the host interface in real time. Therefore, the display response information obtained from the response pin set 12 by the host computer connected to the host display interface 1 is displayed on the virtual display formed by the virtual machine chip 3. And the virtual display formed by the virtual machine chip 3 will not change with the audio/video data output by the host machine on the host machine display interface 1 switched in the host machine switching step. Therefore, under the method, the content of the main screen and the content of the expansion screen can be kept unchanged under continuous switching, and meanwhile, because the virtual display formed by the virtual machine chip 3 continuously responds to the inquiry from the response pin group 12 on the host interface, the black screen generated when the display is just switched due to the fact that the host verifies the response information of the display after the screen is cut can be avoided.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A KVM switch system, comprising:
the display device comprises a host display interface (1), at least two host display interfaces (1) and a control unit, wherein the host display interface (1) is used for connecting a host and comprises an input pin group (11) for unidirectionally inputting audio and video streams and a response pin group (12) for bidirectionally transmitting response signals;
a display interface (2) for connecting a display;
the main control MCU (4) is used for collecting display response information output by a display on the display interface (2) based on the received reading operation signal; the master control MCU (4) acquires audio and video data output by the selected host display interface (1) based on the received switching operation signal and outputs the acquired audio and video data to a display connected with the display interface (2);
the virtual machine chip (3) is connected with a response pin group (12) and a main control MCU (4) of the host display interface (1), the virtual machine chip (3) acquires and stores display response information read by the main control MCU (4), and responds to inquiry of a host connected to the host display interface (1) through the response pin group (12) based on the display response information;
a reading trigger (5) for outputting reading operation information to the master MCU (4);
a switching trigger (6) for outputting switching operation information to the master MCU (4),
the reply pin set (12) includes a DDC channel, an I2C channel, and an HPD channel.
2. The system of claim 1, wherein: the host display interface (1) and the display interface (2) are VGA interfaces, DVI interfaces or HDMI interfaces.
3. The system of claim 1, wherein: the input pin set (11) comprises a TMS channel.
4. The system of claim 1, wherein: the reading trigger part (5) and the switching trigger part (6) are mechanical key trigger parts or virtual key trigger parts.
5. The system of claim 1, wherein: the virtual machine chip (3) is arranged corresponding to the host display interface (1), so that the response pin group (12) of each host display interface (1) is correspondingly connected with one virtual machine chip (3), and the virtual machine chip (3) is connected with the master control MCU (4).
6. A KVM display switch control method for the KVM switch system of any one of the claims 1 to 5, comprising:
based on the received reading operation information, acquiring display response information output by a display connected with a display interface (2), and respectively writing the acquired display response information into a virtual machine chip (3) connected with a host display interface (1); causing the virtual machine chip (3) to respond to a query of a host connected to the host display interface (1) based on the display response information;
and based on the received switching operation information, acquiring audio and video data output by the host on the host display interface (1) corresponding to the switching operation information, and outputting the acquired audio and video data to a display connected with the display interface (2).
7. The method according to claim 6, wherein the display response information includes HPD data and EDID data, and the virtual machine chip (3) replies to the HPD data and the EDID data based on a query of the host on the host display interface (1).
8. The method according to claim 7, wherein the display response message comprises HDPC data, and the virtual machine chip (3) replies to the HDPC data based on an inquiry of the host on the host display interface (1).
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| US8112513B2 (en) * | 2005-11-30 | 2012-02-07 | Microsoft Corporation | Multi-user display proxy server |
| CN207397237U (en) * | 2017-11-24 | 2018-05-22 | 北京市瑞泽胜为科技有限公司 | A kind of KVM switch |
| CN109388247B (en) * | 2018-09-28 | 2021-04-06 | 南京贤隆信息智能科技有限公司 | AUX automatic response device and method of KVM switcher |
| CN110941408B (en) * | 2019-10-22 | 2023-03-14 | 西安雷风电子科技有限公司 | KVM virtual machine graphical interface output method and device |
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