CN108228130A - The liquid crystal display display methods and device of a kind of embedded device - Google Patents
The liquid crystal display display methods and device of a kind of embedded device Download PDFInfo
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- CN108228130A CN108228130A CN201810028047.7A CN201810028047A CN108228130A CN 108228130 A CN108228130 A CN 108228130A CN 201810028047 A CN201810028047 A CN 201810028047A CN 108228130 A CN108228130 A CN 108228130A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- 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
- G06F3/147—Digital output to display device ; Cooperation and interconnection of the display device with other functional units using display panels
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- 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
Abstract
This application discloses the liquid crystal display display methods and device of a kind of embedded device, are related to field of embedded technology, liquid crystal display cannot be driven to invent to solve the problems, such as that hardware condition does not meet Lunix FrameBufuffer mechanism.This method mainly includes：Primary data is converted into the display data of preset data form by application software；Apply for memory block in character device, memory block size is the memory headroom preserved needed for the corresponding data volume of frame data, and frame data is the data that liquid crystal display single is shown；Application software preserves display data to memory block；Character device obtains display data；Display data is sent by bus driver, for bus driver in the Platform drivings in linux system, to choose the bus driver being adapted with bus parameter, bus parameter includes bus number, bus clock and mode bus；Liquid crystal display receives and shows display data.During the application is mainly used in through liquid crystal display display data.
Description
Technical field
This application involves field of embedded technology more particularly to the liquid crystal display display methods and dress of a kind of embedded device
It puts.
Background technology
Embedded device is mainly made of embeded processor, associated support hardware and embedded software system, Ke Yixian
Show graphical interfaces.Embedded device generally use linux system is display using frame buffer FrameBuffer in linux system
Equipment provides interface.FrameBuffer allows upper level applications to be directly written and read under graphic model to display buffer
Operation.Linux FrameBuffer substantially only provide the hardware abstraction to graphics device, in the angle of developer,
FrameBuffer is one piece of display caching, and the data that specific format is written in display caching are meant that into screen output
Hold.
For example, being initialized as the FrameBuffer of 16, two bytes in FrameBuffer represent on screen one
Point, from top to bottom, from left to right, screen position and the linear relationship that memory address is sequence.By ceaselessly to
Data are written in FrameBuffer, display controller reads data from FrameBuffer and shows, whole figures automatically
Same FrameBuffer in shared drive.Display controller is read according to the control of central processor CPU to the position specified
Data and instruction.
In the simple embedded device of structure composition, in CPU may no display controller lamp be responsible for specially display
Module passes through serial peripheral equipment interface SPI bus bar between CPU and liquid crystal display.FrameBuffer mechanism is excessively complicated at this time,
It is incongruent not applicable in hardware condition.
Invention content
This application provides the liquid crystal display display methods and device of a kind of embedded device, are not met with solving hardware condition
The problem of Lunix FrameBufuffer mechanism cannot drive liquid crystal display.
In a first aspect, this application provides a kind of liquid crystal display display methods of embedded device, this method includes：Using soft
Primary data is converted into the display data of preset data form by part；Apply for memory block in character device, the memory block is big
The small memory headroom to preserve needed for the corresponding data volume of frame data, the frame data is that the liquid crystal display single is shown
Data；The application software preserves the display data to the memory block；The character device obtains the display data；
The display data is sent by bus driver, the bus driver is in the Platform drivings in linux system, chooses
The bus driver being adapted with bus parameter, the bus parameter include bus number, bus clock and mode bus；Liquid crystal display
It receives and shows the display data.Using this realization method, flexible liquid crystal is realized in embedded device simple in structure
Screen driving displaying scheme, shields upper level applications particular hardware type and operation, only needs liquid crystal display size with care,
The contents such as color, position, lower floor then complete a plurality of types of hardware adaptations by bus driver structure powerful linux.Meanwhile
Suitable for the hardware of a variety of lcd equipment.
With reference to first aspect, in first aspect in the first possible realization method, the application software is by primary data
The display data of preset data form is converted into, including：The primary data is split into several frame datas, the initial number
According to data format include character, picture, animation and video, the frame data is the data that the liquid crystal display single is shown；
According to the preset data form, the frame data is converted into display data.Using this realization method, while can complete more
The customization of kind form is shown, such as picture, animation etc..
With reference to first aspect, it is described to tear the primary data open in second of possible realization method of first aspect
It is divided into several frame datas, including：Obtain the data format of the primary data；Corresponding split of the data format is searched to calculate
Method；According to the fractionation algorithm, the primary data is split.
With reference to first aspect, it is described in the character device in the third possible realization method of first aspect
Apply for memory block, including：I/O management passages are configured for the memory block, the I/O management passages are ioctl interfaces.Using this
By ioctl interfaces, data receiver and the lower floor of upper application software are realized according to frame buffer principles for realization method
The data transmission of hardware.
With reference to first aspect, in the 4th kind of possible realization method of first aspect, the liquid crystal display is received and is shown
The display data, including：According to preset time interval, refresh the liquid crystal display.Using this realization method, to Dynamic Announce
Control, this needs to stablize the duration per frame, reaches preferable display effect.
Second aspect, present invention also provides a kind of LCD screen display device of embedded device, described device includes using
In the module for performing method and step in the various realization methods of first aspect.
The third aspect, present invention also provides a kind of terminal, including：Processor and memory；The processor can be held
The program stored in the row memory or instruction, so as to fulfill with embedded device described in the various realization methods of first aspect
Liquid crystal display display methods.
Fourth aspect, present invention also provides a kind of storage medium, which can have program stored therein, the journey
Sequence can realize the part or complete in each embodiment of liquid crystal display display methods of the embedded device provided including the application when performing
Portion's step.
Description of the drawings
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the structure diagram that the embedded device that the application provides controls that liquid crystal display is shown；
Fig. 2 is the liquid crystal display display methods flow chart of a kind of embedded device that the application provides；
Fig. 3 is the display data that primary data is converted into preset data form by a kind of application software that the application provides
Method flow diagram；
Fig. 4 is the LCD screen display device composition frame chart of a kind of embedded device that the application provides；
Fig. 5 is the composition frame chart of conversion unit that the application provides.
Specific embodiment
It is that the embedded device that the application provides controls the structure diagram that liquid crystal display is shown referring to Fig. 1.In central processing
Include synchronous DRAM sdram controller in device CPU and liquid crystal display LCD controller, sdram controller are responsible for control
Input, output and the storage of SDRAM, liquid crystal display LCD controller are responsible for controlling the display of liquid crystal display.Liquid crystal is preserved in SDRAM
The display data of screen.
CPU specifies LCD controller to work, then LCD controller goes access evidence to the place specified according to the control of CPU and refers to
Enable, current data be usually taken in video memory, if can not deposited any more in video memory, taken in memory, memory also fails to lay down, then from
It is taken in hard disk, certainly nor memory fails to lay down, but in order to save memory, can be placed in hard disk, then pass through finger
Control display controller is enabled to go to take.Data in FrameBuffer store one by one, and video card can ceaselessly refresh
FrameBuffer, that is, real-time update.Display data is all a dominant information in memory or video memory,
Assuming that being the resolution ratio of 800x600, then what is preserved is 800x600 pixel and color value.
Referring to Fig. 2, the liquid crystal display display methods flow chart of a kind of embedded device provided for the application.As shown in Figure 1,
This method includes：
201st, primary data is converted into the display data of preset data form by application software.
Application software is the part software provided to meet the application demand of user's different field, different problems, uses
In amplification hardware capability, the application program that multiple programming languages and multiple programming languages are worked out can be used
Set.Application software refers to, applied to the embedded device, be related to all softwares that liquid crystal display is shown in this application.Initially
Data refer to the data for needing to show by liquid crystal display.Preset data form refers to can be used in the data lattice that liquid crystal display is shown
Formula, such as RGB, CMYK, YUV etc..No matter the form of primary data is text, picture or video, is all converted to liquid crystal display
The display data that can be shown.
202nd, apply for memory block in character device.
Character device is responsible for interacting with the application software on upper strata, and application software is needed under data receiver to be shown
Come, while this data is transmitted to liquid crystal display up by bus driver.Video, that is, the image continuously played.Also
Be that liquid crystal display shows whole screen image every time, then showing next screen image, if the data of picture format, then in response to
Family operates or the picture switch speed of setting, shows one by one；If the data of video format, then according in video
The switch speed of image switches picture, is identified by stopping of the end of one section of video.
When transmitting data to liquid crystal display, as unit of the data volume shown by a screen, single screen transmission data.In order to reduce number
According to the method for limiting of amount, setting memory block size be the memory headroom needed for the corresponding data volume of preservation frame data, single frames number
According to being data that liquid crystal display single is shown.
For the ease of the transmission of data, I/O management passages are configured for memory block, the I/O management passages connect for ioctl
Mouthful.Ioctl is the function being managed in device driver to the I/O channels of equipment.It is so-called that I/O channels are managed,
Exactly some characteristics of equipment are controlled, such as rotating speed of the Transmission bit rate of serial ports, motor etc..Its number of parameters
It is as follows：int ioctl(int fd,int cmd,…)；Wherein fd is exactly that user program is returned when opening equipment using open functions
The file indications returned, cmd is exactly control command of the user program to equipment, until ellipsis later, that is some supplements
Parameter, most one general, it is relevant with the meaning of cmd to be with or without.Ioctl functions are an attributes in file structure
Component, that is if your driver provides the support to ioctl, user can just use ioctl in user program
The I/O channels of function control device.
203rd, application software preserves display data to memory block.
After application software determines the display data that liquid crystal display is needed to show, display data is preserved to memory block.Memory block
My limited storage space, so application software can set display data to preserve to the transmission speed of memory block or transmission item
Part.For example, if display data is one section of video, then usual this section of video continuously plays, as long as memory can be set
Data in the block have been transmitted to liquid crystal display, just preserve next screen data to memory block.In transmission process, interruption side can be used
Formula response such as suspend, stops, exiting at the imperative operations, force disconnect position, can be application software to memory block export position,
It can also be the export position from memory block to liquid crystal display, not limit in the embodiment of the present application.
204th, character device obtains display data.
Character device obtains display data from memory block.
205th, display data is sent by bus driver.
Bus driver is in the Platform drivings in linux system, chooses the bus being adapted with bus parameter and drives
Dynamic, bus parameter includes bus number, bus clock and mode bus.It is such as total according to bus type and particular hardware parameter
Line number, bus clock, mode bus etc., the parameter of configuration bus apparatus driving, complete driving registration.After the completion of registration, hold
The initialization of row liquid crystal display, is most importantly configured display pattern, this influences whether the data format for being transferred to hardware, in order to
Once format conversion can be carried out again in driving by shielding influence of the hardware configuration to upper strata.
206th, liquid crystal display receives and shows display data.
It specifically includes：According to preset time interval, refresh liquid crystal display.Control to Dynamic Announce, this needs to stablize every
The duration of frame reaches preferable display effect.
Using this realization method, flexible liquid crystal display driving displaying scheme is realized in embedded device simple in structure,
Upper level applications are shielded with particular hardware type and operation, is only needed in liquid crystal display size, color, position etc. with care
Hold, lower floor then completes a plurality of types of hardware adaptations by bus driver structure powerful linux.Meanwhile suitable for a variety of lcd
The hardware of equipment.
It is that primary data is converted into the display of preset data form by a kind of application software that the application provides referring to Fig. 3
The method flow diagram of data.On the basis of method shown in Fig. 2, as shown in figure 3, application software primary data is converted into it is preset
The display data of data format, including：
301st, primary data is split into several frame datas.
The data format of primary data includes character, picture, animation and video, and frame data is that liquid crystal display single is shown
Data.Primary data can be split into several frame datas, and the quantity of frame data is not limited in this application.Tool
Body includes：Obtain the data format of primary data；The corresponding fractionation algorithm of searching data form；According to algorithm is split, split
Primary data.
Application software is then as needed, carries out the customization of content, needs to be parsed and split for different forms.Than
Such as the display of Chinese and English, the parsing of character code and the utilization of Chinese and English character library are needed；Such as the display of picture and animation, this
It needs that the form of picture and animation is parsed and split.
302nd, according to preset data form, frame data is converted into display data.
Preset data form, can be liquid crystal display display mode any one.If the data storage shape of frame data
Formula is different from preset data form, then frame data is converted to display data.
Using this realization method, while the customization that can complete diversified forms is shown, such as picture, animation etc..
It is a kind of embedded device that the application provides referring to Fig. 4 as the specific implementation of method shown in Fig. 2 and Fig. 3
LCD screen display device composition frame chart, referring to Fig. 5, the composition frame chart of conversion unit provided for the application.It as shown in figure 4, should
Device includes：
Primary data is converted into the display data of preset data form for application software by conversion unit 41；
Application unit 42, for applying for memory block in character device, the memory block size is preserves frame data pair
The memory headroom needed for data volume answered, the frame data are the data that the liquid crystal display single is shown；
Storage unit 43 preserves the display data to the memory block for the application software；
Acquiring unit 44 obtains the display data for the character device；
Transmitting element 45 sends the display data for passing through bus driver, and the bus driver is in linux system
In Platform drivings in, choose the bus driver being adapted with bus parameter, the bus parameter includes bus number, total
Line clock and mode bus；
Display unit 46 receives for liquid crystal display and shows the display data.
Further, as shown in figure 5, the conversion unit 41, including：
Module 411 is split, for the primary data to be split into several frame datas, the data lattice of the primary data
Formula includes character, picture, animation and video；
Conversion module 412, for according to the preset data form, the frame data to be converted into display data.
Further, as shown in figure 5, described split module 411, including：
Acquisition submodule 4111, for obtaining the data format of the primary data；
Submodule 4112 is searched, for searching the corresponding fractionation algorithm of the data format；
Submodule 4113 is split, for according to the fractionation algorithm, splitting the primary data.
Further, the application unit 42, is used for：
I/O management passages are configured for the memory block, the I/O management passages are ioctl interfaces.
Further, the display unit 46, is used for：
According to preset time interval, refresh the liquid crystal display.
In the specific implementation, the present invention also provides a kind of computer storage media, wherein, which can store
There is program, which may include when performing in each embodiment of liquid crystal display display methods of embedded device provided by the invention
Part or all of step.The storage medium can be magnetic disc, CD, read-only memory (English：read-only
Memory, referred to as：ROM) or random access memory is (English：Random access memory, referred to as：RAM) etc..
It is required that those skilled in the art can be understood that the technology in the embodiment of the present invention can add by software
The mode of general hardware platform realize.Based on such understanding, the technical solution in the embodiment of the present invention substantially or
It says and the part that the prior art contributes can be embodied in the form of software product, which can deposit
Storage is in storage medium, such as ROM/RAM, magnetic disc, CD, and being used including some instructions (can be with so that computer equipment
Be personal computer, server either network equipment etc.) perform certain part institutes of each embodiment of the present invention or embodiment
The method stated.
Just to refer each other for identical similar part between each embodiment in this specification.Implement especially for device
For example, since it is substantially similar to embodiment of the method, so description is fairly simple, related part is referring in embodiment of the method
Explanation.
Invention described above embodiment is not intended to limit the scope of the present invention..
Claims (10)
1. a kind of liquid crystal display display methods of embedded device, which is characterized in that the method includes：
Primary data is converted into the display data of preset data form by application software；
Apply for memory block in character device, the memory block size is the memory preserved needed for the corresponding data volume of frame data
Space, the frame data are the data that the liquid crystal display single is shown；
The application software preserves the display data to the memory block；
The character device obtains the display data；
The display data is sent by bus driver, during the bus driver drives for the Platform in linux system,
The bus driver being adapted with bus parameter is chosen, the bus parameter includes bus number, bus clock and mode bus；
Liquid crystal display receives and shows the display data.
2. the method as described in claim 1, which is characterized in that primary data is converted into preset data lattice by the application software
The display data of formula, including：
The primary data is split into several frame datas, the data format of the primary data includes character, picture, animation
And video, the frame data are the data that the liquid crystal display single is shown；
According to the preset data form, the frame data is converted into display data.
3. method as claimed in claim 2, which is characterized in that it is described that the primary data is split into several frame datas,
Including：
Obtain the data format of the primary data；
Search the corresponding fractionation algorithm of the data format；
According to the fractionation algorithm, the primary data is split.
4. the method as described in claim 1, which is characterized in that it is described to apply for memory block in the character device, including：
I/O management passages are configured for the memory block, the I/O management passages are ioctl interfaces.
5. the method as described in claim 1, which is characterized in that the liquid crystal display receives and shows the display data, including：
According to preset time interval, refresh the liquid crystal display.
6. a kind of LCD screen display device of embedded device, which is characterized in that described device includes：
Primary data is converted into the display data of preset data form for application software by conversion unit；
Application unit, for applying for memory block in character device, the memory block size is preserves the corresponding number of frame data
According to the memory headroom needed for amount, the frame data is the data that the liquid crystal display single is shown；
Storage unit preserves the display data to the memory block for the application software；
Acquiring unit obtains the display data for the character device；
Transmitting element sends the display data for passing through bus driver, and the bus driver is in linux system
In Platform drivings, the bus driver being adapted with bus parameter is chosen, when the bus parameter includes bus number, bus
Clock and mode bus；
Display unit receives for liquid crystal display and shows the display data.
7. device as claimed in claim 6, which is characterized in that the conversion unit, including：
Module is split, for the primary data to be split into several frame datas, the data format of the primary data includes
Character, picture, animation and video；
Conversion module, for according to the preset data form, the frame data to be converted into display data.
8. device as claimed in claim 7, which is characterized in that the fractionation module, including：
Acquisition submodule, for obtaining the data format of the primary data；
Submodule is searched, for searching the corresponding fractionation algorithm of the data format；
Submodule is split, for according to the fractionation algorithm, splitting the primary data.
9. device as claimed in claim 6, which is characterized in that the application unit is used for：
I/O management passages are configured for the memory block, the I/O management passages are ioctl interfaces.
10. device as claimed in claim 6, which is characterized in that the display unit is used for：
According to preset time interval, refresh the liquid crystal display.
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| CN109597595B (en) * | 2018-10-29 | 2022-03-22 | 广州市中海达测绘仪器有限公司 | Control method and device of liquid crystal display screen, computer equipment and storage medium |
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| CN112433805B (en) * | 2020-12-17 | 2023-05-23 | 潍柴动力股份有限公司 | Simulation method and system of liquid crystal display screen |
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