CN116259258A - Vehicle-mounted screen signal link checking method and device, vehicle-mounted screen and storage medium - Google Patents
Vehicle-mounted screen signal link checking method and device, vehicle-mounted screen and storage medium Download PDFInfo
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- CN116259258A CN116259258A CN202310058273.0A CN202310058273A CN116259258A CN 116259258 A CN116259258 A CN 116259258A CN 202310058273 A CN202310058273 A CN 202310058273A CN 116259258 A CN116259258 A CN 116259258A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
- G06F11/0706—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation the processing taking place on a specific hardware platform or in a specific software environment
- G06F11/0736—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation the processing taking place on a specific hardware platform or in a specific software environment in functional embedded systems, i.e. in a data processing system designed as a combination of hardware and software dedicated to performing a certain function
- G06F11/0739—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation the processing taking place on a specific hardware platform or in a specific software environment in functional embedded systems, i.e. in a data processing system designed as a combination of hardware and software dedicated to performing a certain function in a data processing system embedded in automotive or aircraft systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
- G06F11/0751—Error or fault detection not based on redundancy
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
- G06F11/079—Root cause analysis, i.e. error or fault diagnosis
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
The invention relates to the technical field of vehicle fault positioning, and discloses a vehicle-mounted screen signal link checking method and device, a vehicle-mounted screen and a storage medium, wherein the method comprises the following steps: detecting whether the display of the screen is abnormal or not in real time by touching the lighting screen; when an abnormality is detected, controlling a screen, stopping the MCU from transmitting a touch signal and adjusting the backlight brightness; judging whether the signal communication is normal or not according to the change of the backlight brightness; when the signal communication is normal, controlling the screen, enabling the MCU to change the output so as to stop receiving video signals, and controlling the deserializer to output preset video signals to the screen for display; and judging whether the video link is normal or not according to the display picture. According to the invention, when the display of the screen is abnormal, the fault location is carried out by judging whether the signal communication between the central control board and the screen and the video link are normal, so that the problem that whether the host or the link from the host to the screen or the screen is difficult to judge is solved, the fault and the maintenance are conveniently and rapidly located, and the universality is high.
Description
Technical Field
The invention relates to the technical field of vehicle fault positioning, in particular to a vehicle-mounted screen signal link checking method and device, a vehicle-mounted screen and a storage medium.
Background
Along with the gradual intellectualization of automobiles, the application of a vehicle-mounted screen on the automobiles is more and more widespread, the vehicle-mounted screen is generally connected with the host of the automobiles through cables, the signal transmission of the vehicle-mounted screen on the market is controlled by the multimedia host of the automobiles at present, the center-controlled screen can only passively display pictures transmitted by the host, in the scheme that the vehicle-mounted display screen is connected with the host of the automobiles, when the screen is abnormally displayed, the line from the host to the screen end or the screen itself is difficult to judge whether the host is abnormal or not, because a large number of parts which are not necessarily dismantled are often required to be removed cannot be effectively positioned, a large number of labor expenses are generated in the process of disassembly and replacement, and the automobile interior parts, automobile body parts and other lines are also easy to be damaged, so that the maintenance and inspection for solving the problem of the display of the screen is complex, the maintenance cost is higher, when the screen is in the process of lighting, the display screen is always abnormal, and the screen and the host cannot be normally displayed, at the moment, the engineer can not directly disassemble the screen and the host, so that the engineer wants to judge whether the host is the problem or the screen end is very troublesome and the problem is not easy to be solved, and the problem of the site is not to be solved, and the problem of the maintenance is not to be solved.
Disclosure of Invention
The invention mainly aims to provide a vehicle-mounted screen signal link checking method, a device, a vehicle-mounted screen and a storage medium, and aims to solve the technical problem that whether a host or a line from the host to a screen end or a screen itself is difficult to judge under the condition of not disassembling a vehicle when the screen is abnormally displayed in the prior art.
In order to achieve the above object, the present invention provides a method for inspecting a signal link of a vehicle-mounted screen, which is applied to the vehicle-mounted screen, wherein the vehicle-mounted screen comprises a central control board and a screen, a host is sequentially connected with the central control board and the screen, the central control board comprises an MCU, a touch chip and a deserializer, the MCU, the deserializer and the touch chip are sequentially connected, and the method comprises the following steps:
detecting whether the screen display is abnormal or not in the screen lighting process in real time by touching the lighting screen;
when an abnormality is detected, a first pressing instruction is received through an interruption trigger area on the screen, and the screen is controlled according to the first pressing instruction, so that the MCU stops transmitting touch signals to the host and adjusts backlight brightness of the screen;
judging whether signal communication between the central control board and the screen is normal or not according to the change of the backlight brightness;
When the signal communication between the central control board and the screen is normal, a second pressing instruction is received through an interrupt trigger area on the screen, and the screen is controlled according to the second pressing instruction, so that the MCU changes the output of the deserializer through an IIC channel between the MCU and the deserializer to stop receiving the video signal sent by the host, and controls the deserializer to output a preset video signal to the screen for display;
judging whether a video link between the central control board and the screen is normal or not according to the picture displayed by the screen.
Optionally, the interrupt trigger area includes a first interrupt trigger area and a second interrupt trigger area, and when an abnormality is detected, the interrupt trigger area on the screen receives a first pressing instruction and controls the screen according to the first pressing instruction, so that the MCU stops transmitting a touch signal to the host and adjusts backlight brightness of the screen, including:
when an abnormality is detected, detecting whether a pressing operation with preset duration exists in the first interrupt trigger area and the second interrupt trigger area;
if the touch signal exists, a first pressing instruction is received, and the screen is controlled according to the first pressing instruction, so that the MCU stops transmitting the touch signal to the host computer and adjusts the backlight brightness of the screen.
Optionally, the determining whether the signal communication between the central control board and the screen is normal according to the change of the backlight brightness includes:
when the backlight brightness changes, judging that the signal communication between the central control board and the screen is normal;
when the backlight brightness is unchanged, judging that the signal communication between the central control board and the screen is abnormal, and determining the specific fault position by sequentially replacing the central control board and the screen for cross verification.
Optionally, the interrupt trigger area further includes a third pressing area, when signal communication between the central control board and the screen is normal, the interrupt trigger area on the screen receives a second pressing instruction and controls the screen according to the second pressing instruction, so that the MCU changes the output of the deserializer through an IIC channel between the MCU and the deserializer to stop receiving the video signal sent by the host, and controls the deserializer to output a preset video signal to the screen for display, including:
when the signal communication between the central control board and the screen is normal, detecting whether the first interrupt trigger area, the second interrupt trigger area and the third press area all have press operations with preset time length;
If the video signal is received, a second pressing instruction is received, the screen is controlled according to the second pressing instruction, so that the MCU changes the output of the deserializer through an IIC channel between the MCU and the deserializer to stop receiving the video signal sent by the host, and the deserializer is controlled to output the preset video signal to the screen for display.
Optionally, the judging whether the video link between the central control board and the screen is normal according to the picture displayed by the screen includes:
when the picture displayed by the screen is a preset picture, judging that the video link between the central control board and the screen is normal, and returning to the normal picture by restarting;
when the picture displayed by the screen is not a preset picture, judging that the video link between the central control board and the screen is abnormal, and determining a specific fault position by sequentially replacing the central control board and the screen for cross verification.
Optionally, after detecting whether the screen display is abnormal in the screen lighting process in real time by touching the lighting screen, the method further includes:
when no abnormality is detected, acquiring local voltage signal changes of a touch panel of the screen in a touch process in real time through the touch chip, and obtaining changed voltage signals;
Converting the changed voltage signal into an IIC signal and transmitting the IIC signal to an MCU (micro control unit), so that the MCU carries out reprocessing on the IIC signal and transmits the IIC signal to the deserializer through an IIC channel between the MCU and the deserializer, wherein the IIC signal is a signal transmitted through the IIC channel;
converting the IIC signal into an LVDS signal through the deserializer, and transmitting the LVDS signal to a host through a video beam line of the host;
and analyzing the LVDS signal through the host, and sending a video signal of an incoming picture corresponding to the touch position to a screen so as to enable the screen to play the video.
Optionally, the converting the changed voltage signal into an IIC signal and transmitting the IIC signal to the MCU, so that the MCU reprocesses the IIC signal and transmits the IIC signal to the deserializer through an IIC channel between the MCU and the deserializer, where the IIC signal is a signal transmitted through the IIC channel, and includes:
determining touch position coordinates according to the changed voltage signals, converting the touch position coordinates into IIC signals and transmitting the IIC signals to an MCU (micro control unit), so that the MCU reads the IIC signals and obtains touch coordinate information;
And transmitting the touch coordinate information to the deserializer through an IIC channel between the MCU and the deserializer.
In addition, in order to achieve the above object, the present invention also provides a vehicle-mounted screen signal link checking device, which includes:
the detection module is used for detecting whether the screen display is abnormal or not in the screen lighting process in real time by touching the lighting screen;
the first control module is used for receiving a first pressing instruction through an interrupt trigger area on the screen and controlling the screen according to the first pressing instruction when abnormality is detected, so that the MCU stops transmitting a touch signal to a host and adjusts backlight brightness of the screen;
the first judging module is used for judging whether the signal communication between the central control board and the screen is normal or not according to the change of the backlight brightness;
the second control module is used for receiving a second pressing instruction through an interrupt trigger area on the screen and controlling the screen according to the second pressing instruction when the signal communication between the central control board and the screen is normal, so that the MCU changes the output of the deserializer through an IIC channel between the MCU and the deserializer to stop receiving the video signal sent by the host, and controls the deserializer to output a preset video signal to the screen for display;
And the second judging module is used for judging whether the video link between the central control board and the screen is normal or not according to the picture displayed by the screen.
In addition, in order to achieve the above object, the present invention also proposes a vehicle-mounted screen, including: the system comprises a memory, a processor and a vehicle-mounted screen signal link checking program stored on the memory and capable of running on the processor, wherein the vehicle-mounted screen signal link checking program is configured to realize the steps of the vehicle-mounted screen signal link checking method.
In addition, in order to achieve the above object, the present invention also proposes a storage medium having stored thereon a vehicle-mounted screen signal link checking program which, when executed by a processor, implements the steps of the vehicle-mounted screen signal link checking method as described above.
According to the invention, when the display of the screen is abnormal, the screen is controlled by detecting the pressing operation triggering pressing instruction of the interrupt triggering area on the screen, and whether the signal communication between the central control board and the screen and the video link are normal or not is judged according to the brightness change and the display of the screen, so that fault positioning is performed, the problem that whether the host or the link from the host to the screen or the screen is difficult to judge is solved, the fault is conveniently and rapidly positioned, the maintenance is convenient, and the universality is high.
Drawings
FIG. 1 is a schematic diagram of a vehicle screen of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a flowchart of a first embodiment of a method for inspecting a signal link of a vehicle-mounted screen according to the present invention;
FIG. 3 is a schematic diagram of a structure of a vehicle-mounted screen in an embodiment of a method for checking a signal link of a vehicle-mounted screen according to the present invention;
FIG. 4 is a flowchart of a second embodiment of the signal link checking method for a vehicle-mounted screen according to the present invention;
FIG. 5 is a flowchart of a third embodiment of the signal link checking method for a vehicle-mounted screen according to the present invention;
fig. 6 is a block diagram showing the construction of a first embodiment of the signal link inspection apparatus for a vehicle-mounted screen according to the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a vehicle-mounted screen of a hardware running environment according to an embodiment of the present invention.
As shown in fig. 1, the in-vehicle screen may include: a processor 1001, such as a central processing unit (Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, a memory 1005. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a Wireless interface (e.g., a Wireless-Fidelity (Wi-Fi) interface). The Memory 1005 may be a high-speed random access Memory (Random Access Memory, RAM) or a stable nonvolatile Memory (NVM), such as a disk Memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
It will be appreciated by those skilled in the art that the structure shown in fig. 1 is not limiting and may include more or fewer components than shown, or may be combined with certain components, or a different arrangement of components.
As shown in fig. 1, an operating system, a network communication module, a user interface module, and an in-vehicle screen signal link check program may be included in the memory 1005 as one type of storage medium.
In the in-vehicle screen shown in fig. 1, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the vehicle-mounted screen can be arranged in the vehicle-mounted screen, and the vehicle-mounted screen calls the vehicle-mounted screen signal link checking program stored in the memory 1005 through the processor 1001 and executes the vehicle-mounted screen signal link checking method provided by the embodiment of the invention.
The embodiment of the invention provides a vehicle-mounted screen signal link checking method, and referring to fig. 2, fig. 2 is a flow chart of a first embodiment of the vehicle-mounted screen signal link checking method.
In this embodiment, the vehicle-mounted screen signal link inspection method is applied to a vehicle-mounted screen, the vehicle-mounted screen includes a central control board and a screen, a host computer is connected with the central control board and the screen end in sequence, the central control board includes an MCU, a touch chip and a deserializer, and the MCU, the deserializer and the touch chip are connected in sequence, including the following steps:
Step S10: and detecting whether the screen display is abnormal or not in the screen lighting process in real time by touching the lighting screen.
It should be noted that, the screen is a device or an electric appliance for displaying images and colors, which is also called a display screen, and is widely applied to mobile phones, computers, displays, televisions and devices with image or text display functions.
It is understood that the screen is a touch screen, and operations such as screen lighting, video playing, etc. may be performed by touch operations, and the anomalies include a screen pattern, a screen flashing, etc., which is not particularly limited in this embodiment.
In a specific implementation, when the screen is in a lighting process, whether abnormal phenomena such as screen display, screen splash and the like exist in the screen display is detected in real time, so that a play picture cannot be displayed normally.
As shown in fig. 3, fig. 3 is a schematic diagram of a vehicle-mounted screen structure in the method for checking a signal link of a vehicle-mounted screen, in which the vehicle-mounted screen includes a central control board and a screen, a host is sequentially connected with the central control board and the screen, the central control board includes an MCU, a touch chip and a deserializer, and the MCU, the deserializer and the touch chip are sequentially connected.
Step S20: when an abnormality is detected, a first pressing instruction is received through an interruption trigger area on the screen, and the screen is controlled according to the first pressing instruction, so that the MCU stops transmitting touch signals to the host and adjusts backlight brightness of the screen.
It should be noted that, the interrupt trigger area is a preset fixed position on the screen, and the instruction for controlling the screen can be triggered by pressing the interrupt trigger area for a long time.
It should be noted that, the MCU is a micro control unit (also called a single-chip microcomputer or a single-chip microcomputer), which is to properly reduce the frequency and specification of the cpu, integrate the peripheral interfaces such as the memory, the counter, the USB, the a/D conversion, UART, PLC, DMA, and the like, and even the LCD driving circuit on a single chip, form a chip-level computer, and perform different combination control for different application occasions.
It is understood that when the first pressing command is not received, the MCU continuously receives the touch signal and transmits the touch signal to the host.
It should be noted that the backlight brightness is the brightness generated by the screen backlight, and the backlight is illuminated from the side or back for increasing the illuminance in low light source environment and the brightness on the computer display or liquid crystal screen.
In a specific implementation, when receiving the first pressing instruction, the MCU stops transmitting a corresponding touch signal to the host, adjusts the backlight brightness through the IO port, and switches the backlight brightness from the original brightness to one hundred percent to zero percent and then back to the original brightness.
Step S30: and judging whether the signal communication between the central control board and the screen is normal or not according to the change of the backlight brightness.
It is understood that the change of the backlight brightness is a process of switching the backlight brightness from the original brightness to one hundred percent to zero percent and then back to the original brightness.
It should be understood that the process of determining whether the signal communication between the central control board and the screen is normal according to the change of the backlight brightness, that is, determining whether the signal communication between the central control board and the screen is normal according to whether the backlight brightness is changed from the original brightness to one hundred percent to zero percent and then back to the original brightness.
Further, for fault location, the step S30 includes: when the backlight brightness changes, judging that the signal communication between the central control board and the screen is normal; when the backlight brightness is unchanged, judging that the signal communication between the central control board and the screen is abnormal, and determining the specific fault position by sequentially replacing the central control board and the screen for cross verification.
It should be noted that, when the backlight brightness is switched from the original brightness to one hundred percent and then to zero percent, and then is switched back to the original brightness change, it is determined that the signal communication between the central control board and the screen is normal, and it is further determined whether the video link between the central control board and the screen is normal.
It can be understood that when the backlight brightness is kept unchanged, it is judged that the signal communication between the central control board and the screen is abnormal, and the specific fault position is determined by replacing the central control board and the screen in turn for cross verification.
In a specific implementation, when it is judged that the signal communication between the central control board and the screen is abnormal, the central control board is replaced, the screen is controlled again by receiving a first pressing instruction through an interrupt trigger area on the screen, whether the backlight brightness is changed is judged again, if the backlight brightness is changed, the central control board is determined to be faulty, if the backlight brightness is not changed, the screen is replaced, the operation is repeated, if the backlight brightness is changed, the screen is determined to be faulty, and if the backlight brightness is not changed, the central control board and the screen are both normal, and the host is determined to be faulty.
Step S40: when the signal communication between the central control board and the screen is normal, a second pressing instruction is received through an interrupt trigger area on the screen, and the screen is controlled according to the second pressing instruction, so that the MCU changes the output of the deserializer through an IIC channel between the MCU and the screen to stop receiving the video signal sent by the host, and controls the deserializer to output a preset video signal to the screen for display.
It should be noted that, the IIC channel is a signal line for transmitting signals, and the IIC (Inter-Integrated Circuit), i.e. an integrated circuit bus, is a multi-directional control bus, in which multiple chips can be connected to the same bus structure, and each chip can be used as a control source for implementing data transmission, so that the use of the IIC connection mode simplifies the signal transmission bus interface.
The deserializer is used for converting a low-speed parallel signal into a high-speed serial signal, so that the pin number and the track number can be effectively reduced, and the communication data rate can be improved.
It can be understood that when the second pressing command is not received, the deserializer receives the video signal sent by the host, and sends the video signal to the screen for video playing.
In a specific implementation, when receiving the first pressing instruction, the MCU changes the output of the deserializer through the IIC channel connection between the MCU and the deserializer, the deserializer stops receiving the video signal sent by the host, and outputs a set of fixed video signals to the screen, and the picture of the screen is a fixed color bar picture generated according to the fixed signal output by the deserializer, instead of the video picture transmitted by the host.
Step S50: judging whether a video link between the central control board and the screen is normal or not according to the picture displayed by the screen.
The screen display picture is a fixed color bar picture generated according to the fixed signal output by the deserializer.
It can be understood that whether the video link between the central control board and the screen is normal is judged according to the picture displayed by the screen, that is, whether the video link between the central control board and the screen is normal is judged according to whether the picture displayed by the screen is a fixed color bar picture generated according to the fixed signal output by the deserializer.
Further, for fault location, the step S50 includes: when the picture displayed by the screen is a preset picture, judging that the video link between the central control board and the screen is normal, and returning to the normal picture by restarting; when the picture displayed by the screen is not a preset picture, judging that the video link between the central control board and the screen is abnormal, and determining a specific fault position by sequentially replacing the central control board and the screen for cross verification.
It should be noted that, the preset picture is a fixed color bar picture generated according to the fixed signal output by the deserializer.
It can be understood that when the picture displayed on the screen is a fixed color bar picture, the video link between the central control board and the screen is judged to be normal, and the normal picture is returned through restarting, and when the picture displayed on the screen is not the fixed color bar picture but is still the video picture transmitted by the host, the video link between the central control board and the screen is judged to be abnormal.
In a specific implementation, when the video link between the central control board and the screen is abnormal, the central control board is replaced, a second pressing instruction is received through an interruption trigger area on the screen again to control the screen, whether the picture displayed by the screen is a fixed color bar picture or not is judged again, if yes, the picture is determined to be a fault of the central control board, if not, the screen is replaced, the operation is repeated, if the picture displayed by the screen is a fixed color bar picture, the picture is determined to be a fault of the screen, and if the picture displayed by the screen is not a fixed color bar picture, both the central control board and the screen are normal, and the picture is determined to be a fault of a host.
According to the embodiment, when the screen is abnormally displayed, the screen is controlled by detecting the pressing operation triggering pressing instruction of the interrupt triggering area on the screen, and judging whether the signal communication between the central control board and the screen and the video link are normal or not according to the brightness change and the display of the screen, so that fault location is performed, the problem that whether a host or a link from the host to the screen or the screen itself is difficult to judge is solved, the fault is located conveniently and rapidly, maintenance is convenient, and universality is high.
Referring to fig. 4, fig. 4 is a flowchart of a second embodiment of the signal link checking method for the vehicle-mounted screen according to the present invention.
Based on the above-mentioned first embodiment, the step S20 in the method for checking a signal link of a vehicle-mounted screen according to this embodiment includes:
step S201: and when the abnormality is detected, detecting whether the first interrupt trigger area and the second interrupt trigger area both have pressing operation with preset duration.
It should be noted that, the interrupt trigger area is a fixed position on the screen, and the first interrupt trigger area and the second interrupt trigger area may be left upper area and right lower area of the screen, which is not limited in this embodiment.
It is understood that the preset time period is greater than or equal to 10 seconds, and may be 10 seconds, 15 seconds, 12 seconds, etc., which is not particularly limited in this embodiment.
In a specific implementation, when abnormal phenomena such as screen display, screen splash and the like are detected, the screen is pressed for ten seconds at a fixed position (such as upper left and lower right) for a long time, and a first pressing instruction is triggered.
Step S202: if the touch signal exists, a first pressing instruction is received, and the screen is controlled according to the first pressing instruction, so that the MCU stops transmitting the touch signal to the host computer and adjusts the backlight brightness of the screen.
When the upper left and lower right of the fixed position of the screen detect long pressing for ten seconds or more, the MCU receives the first pressing command, stops transmitting corresponding touch signals to the host, controls the backlight brightness to be switched from original brightness to hundred percent to zero percent through the IO port, and then switches back to the original brightness change.
Further, in order to detect whether a video link between a central control board and the screen is normal, when signal communication between the central control board and the screen is normal, a second pressing instruction is received through an interrupt trigger area on the screen and the screen is controlled according to the second pressing instruction, so that the MCU changes the output of the deserializer through an IIC channel between the MCU and the deserializer to stop receiving a video signal sent by the host, and controls the deserializer to output a preset video signal to the screen for display, including: when the signal communication between the central control board and the screen is normal, detecting whether the first interrupt trigger area, the second interrupt trigger area and the third press area all have press operations with preset time length; if the video signal is received, a second pressing instruction is received, the screen is controlled according to the second pressing instruction, so that the MCU changes the output of the deserializer through an IIC channel between the MCU and the deserializer to stop receiving the video signal sent by the host, and the deserializer is controlled to output the preset video signal to the screen for display.
It should be noted that, the interrupt trigger area further includes a third pressing area, and the third pressing area may be a middle area on the screen, which is not limited in this embodiment.
It can be understood that when the screen display has abnormal phenomena such as screen display, screen flashing and the like and the signal communication between the central control board and the screen is normal, the screen is pressed for ten seconds at a fixed position (such as upper left, lower right and middle) for triggering the second pressing instruction.
In a specific implementation, when the long pressing time of ten seconds or more is detected at the left upper part, the right lower part and the middle part of the fixed position of the screen, the MCU changes the output of the deserializer through the IIC channel connection between the MCU and the deserializer, the deserializer stops receiving the video signal sent by the host computer and outputs a group of fixed video signals to the screen, and the picture of the screen is a fixed color bar picture sent by the deserializer instead of the video picture sent by the host computer.
According to the embodiment, the screen is controlled by the trigger pressing command through long-pressing the screen interrupt trigger area for a preset time, and whether the signal communication and the video link between the central control board and the screen are normal or not is judged according to the brightness change and the display of the screen, so that the cost is not required to be increased, and no hardware is added.
Referring to fig. 5, fig. 5 is a flowchart of a third embodiment of the signal link checking method for the vehicle-mounted screen according to the present invention.
Based on the above-mentioned first embodiment, after step S10 in the method for checking a signal link of a vehicle-mounted screen according to this embodiment, the method further includes:
step S11: when no abnormality is detected, the touch chip is used for collecting local voltage signal changes of the touch panel of the screen in real time in the touch process, and a changed voltage signal is obtained.
It should be noted that, the touch chip refers to a single-point or multi-point touch technology, the application range is a mobile phone, a computer, etc., and is an important part in an electronic device, and the touch chip is used for collecting local voltage signal changes and storing the changed voltage signals of a touch panel of a screen in the touch process.
It can be understood that the screen may be a capacitive screen, when the screen is touched, the capacitance of the capacitor will change, the voltage signal in the corresponding area will also change, and the touch chip will collect the change of the voltage signal in real time.
Step S12: and converting the changed voltage signal into an IIC signal and transmitting the IIC signal to an MCU (micro control unit), so that the MCU processes the IIC signal again and transmits the IIC signal to the deserializer through an IIC channel between the MCU and the deserializer.
It should be noted that, the IIC signal is a signal transmitted through an IIC channel, and the IIC signal is only a path of a transmission signal, that is, the signal at the transmitting end is transmitted to the receiving end through an IIC path.
It can be understood that the MCU has multiple IO ports, all can be selected as IIC channels, the IIC channels between each section of chips are independent and have no multiplexing, namely, the communication from the touch chip to the MCU is one IIC channel, the communication from the MCU to the deserializer is one IIC channel, and the two IIC channels are separated.
In a specific implementation, the IIC signal is read by the MCU to obtain touch coordinate information.
Further, in order to convert the changed voltage signal into the IIC signal, the step S12 includes: determining touch position coordinates according to the changed voltage signals, converting the touch position coordinates into IIC signals and transmitting the IIC signals to an MCU (micro control unit), so that the MCU reads the IIC signals and obtains touch coordinate information; and transmitting the touch coordinate information to the deserializer through an IIC channel between the MCU and the deserializer.
It should be noted that, when the screen is touched, the capacitance of the capacitor will change, and the voltage signal of the corresponding area will also change, so that the touch position can be determined according to the changed voltage signal.
It can be understood that the touch chip can acquire the changed voltage signal in real time, the firmware burnt in advance in the touch chip can process the changed voltage signal to obtain the touch position coordinate, the touch position coordinate is converted into an IIC signal, the MCU reads the IIC signal according to the IIC protocol preset with the touch chip to obtain touch coordinate information, the coordinate information is transmitted to the deserializer, and the deserializer transmits the coordinate information to the host.
Step S13: and converting the IIC signal into an LVDS signal through the deserializer, and transmitting the LVDS signal to a host through a video beam line of the host.
It should be noted that, the LVDS signal, i.e., the Low voltage differential signal (Low-Voltage Differential Signaling), is a differential signal technology with Low power consumption, low bit error rate, low crosstalk and Low radiation, the data transmission rate can reach more than 155Mbps, and the core of the LVDS technology is to use extremely Low voltage swing to differentially transmit data at high speed, so as to realize point-to-point or point-to-multipoint connection.
It can be understood that the deserializer obtains touch coordinate information by reading the IIC signal sent by the MCU, converts the touch coordinate information into LVDS signal, and sends the LVDS signal to the serializer on the host through the video harness inserted on the video connector, where the harness video harness can only transmit the LVDS signal, and can synchronously send and receive.
Step S14: and analyzing the LVDS signal through the host, and sending a video signal of an incoming picture corresponding to the touch position to a screen so as to enable the screen to play the video.
The host is a terminal device for transmitting and receiving information.
It is understood that video signals refer to television signals, still image signals and visual television image signals.
In a specific implementation, after the host analyzes the LVDS signal, the serializer of the host sends an interrupt signal to the SOC, and the SOC reads the touch coordinate information through the IIC channel and outputs a video signal of an incoming screen corresponding to the touch position to the screen, and the screen performs video playing.
According to the embodiment, the touch chip can acquire a changed voltage signal generated by the touch screen in real time and convert the changed voltage signal into an IIC signal, the IIC signal is transmitted to the deserializer and converted into an LVDS signal, the deserializer transmits the LVDS signal to the host for analysis, and a video signal of an incoming picture corresponding to the touch position is transmitted to the screen for video playing.
Referring to fig. 6, fig. 6 is a block diagram showing the structure of a first embodiment of the signal link inspection apparatus for a vehicle-mounted screen according to the present invention.
As shown in fig. 6, the device for checking a signal link of a vehicle-mounted screen according to an embodiment of the present invention includes:
The detection module 10 is used for detecting whether the screen display is abnormal or not in the screen lighting process in real time by touching the lighting screen;
the first control module 20 is configured to, when an abnormality is detected, receive a first pressing instruction through an interrupt trigger area on the screen and control the screen according to the first pressing instruction, so that the MCU stops transmitting a touch signal to a host and adjusts backlight brightness of the screen;
a first judging module 30, configured to judge whether signal communication between the central control board and the screen is normal according to the change of the backlight brightness;
the second control module 40 is configured to receive a second pressing instruction through an interrupt trigger area on the screen and control the screen according to the second pressing instruction when signal communication between the central control board and the screen is normal, so that the MCU changes the output of the deserializer through an IIC channel between the MCU and the deserializer to stop receiving the video signal sent by the host, and controls the deserializer to output a preset video signal to the screen for display;
and the second judging module 50 is used for judging whether the video link between the central control board and the screen is normal or not according to the picture displayed by the screen.
In an embodiment, the first control module 20 is further configured to detect, when an abnormality is detected, whether a pressing operation for a preset duration exists in both the first interrupt trigger area and the second interrupt trigger area; if the touch signal exists, a first pressing instruction is received, and the screen is controlled according to the first pressing instruction, so that the MCU stops transmitting the touch signal to the host computer and adjusts the backlight brightness of the screen.
In one embodiment, the first judging module 30 is further configured to judge that signal communication between the central control board and the screen is normal when the backlight brightness is changed; when the backlight brightness is unchanged, judging that the signal communication between the central control board and the screen is abnormal, and determining the specific fault position by sequentially replacing the central control board and the screen for cross verification.
In an embodiment, the second control module 40 is further configured to detect whether the first interrupt trigger area, the second interrupt trigger area, and the third press area all have a press operation with a preset duration when the signal communication between the central control board and the screen is normal; if the video signal is received, a second pressing instruction is received, the screen is controlled according to the second pressing instruction, so that the MCU changes the output of the deserializer through an IIC channel between the MCU and the deserializer to stop receiving the video signal sent by the host, and the deserializer is controlled to output the preset video signal to the screen for display.
In an embodiment, the second judging module 50 is further configured to judge that the video link between the central control board and the screen is normal when the frame displayed on the screen is a preset frame, and return to the normal frame by restarting; when the picture displayed by the screen is not a preset picture, judging that the video link between the central control board and the screen is abnormal, and determining a specific fault position by sequentially replacing the central control board and the screen for cross verification.
In addition, in order to achieve the above object, the present invention also proposes a vehicle-mounted screen, including: the system comprises a memory, a processor and a vehicle-mounted screen signal link checking program stored on the memory and capable of running on the processor, wherein the vehicle-mounted screen signal link checking program is configured to realize the steps of the vehicle-mounted screen signal link checking method.
The vehicle-mounted screen adopts all the technical schemes of all the embodiments, so that the vehicle-mounted screen has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.
In addition, the embodiment of the invention also provides a storage medium, wherein the storage medium is stored with a vehicle-mounted screen signal link checking program, and the vehicle-mounted screen signal link checking program realizes the steps of the vehicle-mounted screen signal link checking method when being executed by a processor.
Because the storage medium adopts all the technical schemes of all the embodiments, the storage medium has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted here.
It should be understood that the foregoing is illustrative only and is not limiting, and that in specific applications, those skilled in the art may set the invention as desired, and the invention is not limited thereto.
It should be noted that the above-described working procedure is merely illustrative, and does not limit the scope of the present invention, and in practical application, a person skilled in the art may select part or all of them according to actual needs to achieve the purpose of the embodiment, which is not limited herein.
In addition, technical details not described in detail in the present embodiment may refer to the method for checking a signal link of a vehicle-mounted screen provided in any embodiment of the present invention, which is not described herein again.
Furthermore, it should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. Read Only Memory)/RAM, magnetic disk, optical disk) and including several instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (10)
1. The utility model provides a vehicle-mounted screen signal link inspection method which is characterized in that is applied to vehicle-mounted screen, vehicle-mounted screen includes well accuse board and screen, the host computer with well accuse board and screen end link to each other in proper order, well accuse board includes MCU, touch chip and deserializer, MCU, deserializer and touch chip connect gradually, the method includes:
detecting whether the screen display is abnormal or not in the screen lighting process in real time by touching the lighting screen;
when an abnormality is detected, a first pressing instruction is received through an interruption trigger area on the screen, and the screen is controlled according to the first pressing instruction, so that the MCU stops transmitting touch signals to the host and adjusts backlight brightness of the screen;
judging whether signal communication between the central control board and the screen is normal or not according to the change of the backlight brightness;
when the signal communication between the central control board and the screen is normal, a second pressing instruction is received through an interrupt trigger area on the screen, and the screen is controlled according to the second pressing instruction, so that the MCU changes the output of the deserializer through an IIC channel between the MCU and the deserializer to stop receiving the video signal sent by the host, and controls the deserializer to output a preset video signal to the screen for display;
Judging whether a video link between the central control board and the screen is normal or not according to the picture displayed by the screen.
2. The method of claim 1, wherein the interrupt trigger area includes a first interrupt trigger area and a second interrupt trigger area, and when an abnormality is detected, receiving a first press command through the interrupt trigger area on the screen and controlling the screen according to the first press command, so that the MCU stops transmitting a touch signal to the host and adjusts backlight brightness of the screen, comprising:
when an abnormality is detected, detecting whether a pressing operation with preset duration exists in the first interrupt trigger area and the second interrupt trigger area;
if the touch signal exists, a first pressing instruction is received, and the screen is controlled according to the first pressing instruction, so that the MCU stops transmitting the touch signal to the host computer and adjusts the backlight brightness of the screen.
3. The method of claim 1, wherein the determining whether the signal communication between the center pad and the screen is normal according to the change of the backlight brightness comprises:
when the backlight brightness changes, judging that the signal communication between the central control board and the screen is normal;
When the backlight brightness is unchanged, judging that the signal communication between the central control board and the screen is abnormal, and determining the specific fault position by sequentially replacing the central control board and the screen for cross verification.
4. The method of claim 2, wherein the interrupt trigger area further includes a third pressing area, and when the signal communication between the central control board and the screen is normal, the method receives a second pressing instruction through the interrupt trigger area on the screen and controls the screen according to the second pressing instruction, so that the MCU changes the output of the deserializer through the IIC channel between the MCU and the deserializer to stop receiving the video signal sent by the host, and controls the deserializer to output a preset video signal to the screen for display, including:
when the signal communication between the central control board and the screen is normal, detecting whether the first interrupt trigger area, the second interrupt trigger area and the third press area all have press operations with preset time length;
if the video signal is received, a second pressing instruction is received, the screen is controlled according to the second pressing instruction, so that the MCU changes the output of the deserializer through an IIC channel between the MCU and the deserializer to stop receiving the video signal sent by the host, and the deserializer is controlled to output the preset video signal to the screen for display.
5. The method of claim 1, wherein the determining whether the video link between the center pad and the screen is normal according to the screen displayed picture comprises:
when the picture displayed by the screen is a preset picture, judging that the video link between the central control board and the screen is normal, and returning to the normal picture by restarting;
when the picture displayed by the screen is not a preset picture, judging that the video link between the central control board and the screen is abnormal, and determining a specific fault position by sequentially replacing the central control board and the screen for cross verification.
6. The method of claim 1, wherein the detecting in real time whether the screen display is abnormal during the screen lighting process by touching the lighting screen further comprises:
when no abnormality is detected, acquiring local voltage signal changes of a touch panel of the screen in a touch process in real time through the touch chip, and obtaining changed voltage signals;
converting the changed voltage signal into an IIC signal and transmitting the IIC signal to an MCU (micro control unit), so that the MCU carries out reprocessing on the IIC signal and transmits the IIC signal to the deserializer through an IIC channel between the MCU and the deserializer, wherein the IIC signal is a signal transmitted through the IIC channel;
Converting the IIC signal into an LVDS signal through the deserializer, and transmitting the LVDS signal to a host through a video beam line of the host;
and analyzing the LVDS signal through the host, and sending a video signal of an incoming picture corresponding to the touch position to a screen so as to enable the screen to play the video.
7. The method of claim 6, wherein the converting the varying voltage signal to an IIC signal for transmission to an MCU to cause the MCU to reprocess the IIC signal and transmit to the deserializer via an IIC channel between the MCU and the deserializer, wherein the IIC signal is a signal transmitted via an IIC channel, comprising:
determining touch position coordinates according to the changed voltage signals, converting the touch position coordinates into IIC signals and transmitting the IIC signals to an MCU (micro control unit), so that the MCU reads the IIC signals and obtains touch coordinate information;
and transmitting the touch coordinate information to the deserializer through an IIC channel between the MCU and the deserializer.
8. An on-board screen signal link inspection apparatus, the apparatus comprising:
the detection module is used for detecting whether the screen display is abnormal or not in the screen lighting process in real time by touching the lighting screen;
The first control module is used for receiving a first pressing instruction through an interrupt trigger area on the screen and controlling the screen according to the first pressing instruction when abnormality is detected, so that the MCU stops transmitting a touch signal to a host and adjusts backlight brightness of the screen;
the first judging module is used for judging whether the signal communication between the central control board and the screen is normal or not according to the change of the backlight brightness;
the second control module is used for receiving a second pressing instruction through an interrupt trigger area on the screen and controlling the screen according to the second pressing instruction when the signal communication between the central control board and the screen is normal, so that the MCU changes the output of the deserializer through an IIC channel between the MCU and the deserializer to stop receiving the video signal sent by the host, and controls the deserializer to output a preset video signal to the screen for display;
and the second judging module is used for judging whether the video link between the central control board and the screen is normal or not according to the picture displayed by the screen.
9. A vehicle screen, the vehicle screen comprising: a memory, a processor, and a vehicle screen signal link check program stored on the memory and executable on the processor, the vehicle screen signal link check program configured to implement the vehicle screen signal link check method of any one of claims 1 to 7.
10. A storage medium having stored thereon a vehicle-mounted screen signal link check program which, when executed by a processor, implements the vehicle-mounted screen signal link check method according to any one of claims 1 to 7.
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| CN202310058273.0A CN116259258A (en) | 2023-01-16 | 2023-01-16 | Vehicle-mounted screen signal link checking method and device, vehicle-mounted screen and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116546191A (en) * | 2023-07-05 | 2023-08-04 | 杭州海康威视数字技术股份有限公司 | Video link quality detection method, device and equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116546191A (en) * | 2023-07-05 | 2023-08-04 | 杭州海康威视数字技术股份有限公司 | Video link quality detection method, device and equipment |
| CN116546191B (en) * | 2023-07-05 | 2023-09-29 | 杭州海康威视数字技术股份有限公司 | Video link quality detection method, device and equipment |
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