CN109147655A - A kind of LED display control system based on ARM - Google Patents
A kind of LED display control system based on ARM Download PDFInfo
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- CN109147655A CN109147655A CN201811336407.6A CN201811336407A CN109147655A CN 109147655 A CN109147655 A CN 109147655A CN 201811336407 A CN201811336407 A CN 201811336407A CN 109147655 A CN109147655 A CN 109147655A
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- module
- led display
- display control
- system based
- memory module
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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
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
Abstract
A kind of LED display control system based on ARM is disclosed in the present invention, including communication module, control module, SRAM memory module, serial Flash memory module and LED large screen, the communication module is separately connected host computer and control module, the control module connection SRAM memory module and serial Flash memory module, the SRAM memory module are connected to LED large screen.The present invention carries out calculation process with microcontroller, meanwhile, control signal and data, processing and modification to content to be shown are received using host computer.The high speed and refresh rate of data processing, refresh rate inadequate disadvantage when overcoming conventional one-piece machine to large screen processing.The mapping relations between data and storage address are realized, program volume is facilitated.
Description
Technical field
The present invention relates to advertisement design manufacturing field, in particular to a kind of LED display control system based on ARM.
Background technique
LED is one kind of semiconductor diode, electric energy can be converted to luminous energy.Light emitting diode and general-purpose diode one
Sample is made of a PN junction, it may have unilateral conduction.After adding forward voltage to light emitting diode, N is injected into from the area P
The hole in area and the electronics that the area P is injected by the area N, it is multiple with the hole in the electronics in the area N and the area P respectively in a few micrometers near the PN junction
It closes, generates the fluorescence of spontaneous radiation.Energy state locating for electrons and holes is different in different semiconductor materials.When electronics and
The amount released when hole-recombination is different, and the energy released is more, then the wavelength of the light issued is shorter.The most commonly used is
It glows, the diode of green light or yellow light.The breakdown reverse voltage of light emitting diode is greater than 5 volts.Its positive C-V characteristic is bent
Line is very steep, when use must series limiting resistor to control the electric current by diode.LED display is passed as generation information
Media vehicles are broadcast, it is primarily due to and has several advantages that long service life, power consumption are lower, brightness is relatively high, angle of visibility
Degree is big, visual range is remote etc..Nowadays LED display is using very extensive, for example, securities trading, finance, station, stadiums,
The various public places such as road traffic, air station flight, Dispatch and Command Center, market, advertising media, postal service, performance, exhibition.
Compared with nowadays LCD, LED display has low cost, high brightness and the LED that scene needs can be spliced into standard block plate
Screen size.With the development of science and technology, LED material technology and process means are also stepping up, rely on its advantage outstanding,
LED display becomes one of the main product that information is shown.Demand of the China to LED display is all constantly increasing every year.
According to industry statistic, China East China is the most area of full-color LED display screen manufacturer, accounting 34.5%, China of China
Southern area is taken second place, accounting 28.7%, and other places are all some little companies, and the capability of independent innovation is weaker.The country is in this row
Industry it is relatively good have Shenzhen Ai Bisen, Huizhou desai, moral glory electricity etc..Meanwhile by the collaboration of industry, TCL, Konka, Skyworth,
The major power plant such as Hisense, Changhong comes into LED display industry and illuminating industry, LED backlight industry, makes following industry
Integration and competition situation are fiercer.Major part LED display screen system is still based on 8/16 single-chip microcontroller conduct of high-performance at present
Microprocessor, dominant frequency are restricted, and also limit the steady of the visible area of scanning speed and LED display to a certain extent
It is qualitative.LED display is inflexible to the processing aspect of ASCII character and Chinese character, first each character or Chinese character array representation
Out, then the array is embedded into inside program, in this way when needing to show a large amount of Chinese characters or character, what is just shown is suitable
Trouble.Traditional LED display screen is all based on 8/16 single-chip microcontroller of high-performance, and using 8051 kernels, system dominant frequency is lower, right
Data storage and processing are to be not suitable for the design of large screen by extending external flash；Using ARM/FPGA as microprocessor
When, although the shortcomings that overcoming single-chip microcontroller, cost is also to significantly improve.A kind of LED based on ARM is developed hereby to show
Shield control system.
Summary of the invention
It is an object of the invention to solve the problem in above-mentioned technology, a kind of LED display control based on ARM is provided
System processed, control module of the system based on ARM carry out calculation process with microcontroller, meanwhile, it is received and is controlled using host computer
Signal processed and data, processing and modification to content to be shown.The high speed and refresh rate of data processing, overcomes biography
Refresh rate inadequate disadvantage when uniting single-chip microcontroller to large screen processing.The mapping realized between data and storage address is closed
System facilitates programming, while to get ready below to LED display display effect algorithm.Host computer can also be passed through
The algorithm that software realization Hanzi font library and ASCII character disposably export facilitates and modifies some Chinese character or ASCII, to program band
Convenience is carried out.
In order to solve the above technical problems, The technical solution adopted by the invention is as follows:
A kind of LED display control system based on ARM, including communication module, control module, SRAM memory module, string
Row Flash memory module and LED large screen, the communication module are separately connected host computer and control module, the control
Module connection SRAM memory module and serial Flash memory module, the SRAM memory module are connected to LED large screen.
Further, as preferably technical solution is obtained, the control module includes microprocessor, the micro process
Device includes 32 risc processor chips.
Further, as preferably technical solution is obtained, the risc processor chip includes UART serial ports and JTAG
Interface.
Further, as preferably technical solution is obtained, pass through RS232/485 between the communication module and host computer
Conversion module connection.
Further, as technical solution is preferably obtained, the control module is additionally provided with LED display control card mold
Block.
Further, as preferably technical solution is obtained, the control module is also connected with pulse signal circuit, described
Pulse signal circuit link control module in respectively control signal generating circuit, the pulse signal circuit is connected to address change
Change circuit, the address change circuit two and SRAM memory module.
Further, as preferably technical solution is obtained, pass through drive between the SRAM memory module and LED large screen
Dynamic circuit connection.
Further, as preferably technical solution is obtained, scan protection is additionally provided between driving circuit and control module
Module.
Possessed by of the invention the utility model has the advantages that
The present invention carries out calculation process with microcontroller, meanwhile, control signal and data are received using host computer, to wanting
The processing and modification of the content of display.The high speed and refresh rate of data processing, overcomes conventional one-piece machine to large screen
Refresh rate inadequate disadvantage when processing.The mapping relations between data and storage address are realized, programming is facilitated,
It is simultaneously to get ready below to LED display display effect algorithm.Hanzi font library can also be realized by upper computer software
The algorithm disposably exported with ASCII character facilitates and modifies some Chinese character or ASCII, brings conveniently for programming.
Detailed description of the invention
Fig. 1 is structure of the invention block diagram.
Specific embodiment
The present invention is further illustrated in the following with reference to the drawings and specific embodiments.
Embodiment 1
A kind of LED display control system based on ARM as shown in Figure 1, including communication module, control module, SRAM
Memory module, serial Flash memory module and LED large screen, the communication module are separately connected host computer and control module,
The control module connection SRAM memory module and serial Flash memory module, the SRAM memory module are connected to LED
Large screen, the control module include microprocessor, and the microprocessor includes 32 risc processor chips, described
Risc processor chip include UART serial ports and jtag interface, pass through RS232/ between the communication module and host computer
The connection of 485 conversion modules, the control module are additionally provided with LED display control card module, and the control module also connects
It is connected to pulse signal circuit, signal generating circuit, the arteries and veins are respectively controlled in the pulse signal circuit link control module
It rushes signal circuit and is connected to address change circuit, the address change circuit two and SRAM memory module.The SRAM
It is connected between memory module and LED large screen by driving circuit.Scanning is additionally provided between driving circuit and control module to protect
Protect module.
At work, driving circuit is mainly that the LED lamp tube driving of display screen provides constant-current source；SRAM stores up module
It stores LED and shows information；Control module mainly completes data processing；Communication module realizes the communication of host computer, receives upper
The control signal and data of machine；Host computer user's operation control platform part, realizes the processing and modification of content to be shown.Control
Molding block is the core of whole system, and the operation of the controller and processing capacity are directly determined by ARM performance.For convenience of display,
Data are stored with two memories respectively, show that the information of dot matrix and some necessary parameters are stored in FLASH memory
In, prevent power down from losing, the lattice information exported immediately is stored in SRAM memory, and access speed is fast；It is another electric equipped with driving
Road drives the lattice information of output, too long to prevent stop signal transmission range, decaying is excessive and cause LED display can not
It works normally；Output information is monitored using scan protection module, prevents LED unit plate line driving chip fixed for a long time
Certain a line is scanned, finally burns line driving chip since driving current is excessive.
Preferably, control module uses jtag interface, and jtag interface is a kind of international standard test protocol, and chip interior is fixed
One TAP of justice, by dedicated jtag test tool tests inter-chip traces.JTAG defines progress boundary and sweeps
Required hardware and software is retouched, the boundary scan testing of circuit is mainly used in and row emulation, debugging are hung to system.It is many high
Grade chip all supports JTAG to assist, can be with trace routine by JTAG debugging tool, while staring at AG and supporting two kinds of moulds of JTAG and SWD
Formula, and STM32 also supports both modes, brings conveniently to debugging.Preferably, scan protection module includes that a scanning is protected
Protection circuit, which is mainly that prevention unit chip on board is burnt, because working as what LED display scanned certain a line in fixation
When, this line electric current will be made excessive, so that chip will be burnt out.Based on this, one is devised when circuit design
A protection circuit module is lighted when detecting that certain row is fixed, then turns off driver, to reach protective effect.Protection electricity
Using PICl2C508A single-chip microcontroller in road, 8 pins of the chip, the area of chip is also smaller, uses and also compares
It is convenient.It protects circuit mainly to detect energy signal E, detects when detecting output abnormality, after certain time-delay and still normally pass through
GP5 sets the OE# of 74HC245 as height, turns off the output of screen.
Preferably, microprocessor is the core of entire LED display screen system, and microprocessor program mainly realizes two big function
Energy: first is that updating LED display shows content, FLASH memory module is managed: second is that realizing host computer and bottom
Communication.According to the needs that system designs, microprocessor program is divided into four independent modules: serial communication modular, display
The processing module of module, FLASH management module and ASCII character and Hanzi font library.Serial communication modular: the basic training of serial ports is realized
Can, receive host computer data；Display module: tissue and processing to needing content to be shown to carry out data: FLASH manages mould
Block: the functions such as the main erasing for realizing external FLASH, data write-in；The processing module of Hanzi font library and ASCII character: according to aobvious
The content shown is shown or is modified to Chinese character and ASCII character, it can be achieved that disposable all displays, facilitate modification and programming.?
It before program operation, first has to initialize some functions, function major function is the clock for initializing STM32, wherein wrapping
It includes the reset for carrying out configuration and some relevant peripheral hardwares to vector table to configure, system clock is reachable after configuring by these
To 72MHz；Its is secondary to initialize some peripheral hardwares, such as serial ports, I/O mouthful are initialized；In order to be selected
Different modes carrys out selection mode using key, can select clock module, temperature model or picture and text mode by key
Deng；Finally by be exactly display is called to modules function, so that it may realize different display patterns.
The description and the appended drawings of the invention be considered as it is illustrative and not restrictive, on the basis of the present invention, ability
According to disclosed technology contents, some of technical characteristics can be made field technique personnel by not needing creative labor
Some replacements and deformation, are within the scope of the invention.
Claims (8)
1. a kind of LED display control system based on ARM, including it is communication module, control module, SRAM memory module, serial
Flash memory module and LED large screen, which is characterized in that the communication module is separately connected host computer and control module, institute
The control module connection SRAM memory module and serial Flash memory module stated, it is big that the SRAM memory module is connected to LED
Screen.
2. a kind of LED display control system based on ARM according to claim 1, which is characterized in that the control
Module includes microprocessor, and the microprocessor includes 32 risc processor chips.
3. a kind of LED display control system based on ARM according to claim 2, which is characterized in that the RISC
Processor chips include UART serial ports and jtag interface.
4. a kind of LED display control system based on ARM according to claim 1, which is characterized in that the communication
It is connected between module and host computer by RS232/485 conversion module.
5. a kind of LED display control system based on ARM according to claim 1, which is characterized in that the control
Module is additionally provided with LED display control card module.
6. a kind of LED display control system based on ARM according to claim 1, which is characterized in that the control
Module is also connected with pulse signal circuit, respectively controls signal generating circuit in the pulse signal circuit link control module,
The pulse signal circuit is connected to address change circuit, the address change circuit two and SRAM memory module.
7. a kind of LED display control system based on ARM according to claim 1, which is characterized in that the SRAM
It is connected between memory module and LED large screen by driving circuit.
8. a kind of LED display control system based on ARM according to claim 7, which is characterized in that driving circuit and
Scan protection module is additionally provided between control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811336407.6A CN109147655A (en) | 2018-11-12 | 2018-11-12 | A kind of LED display control system based on ARM |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811336407.6A CN109147655A (en) | 2018-11-12 | 2018-11-12 | A kind of LED display control system based on ARM |
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| Publication Number | Publication Date |
|---|---|
| CN109147655A true CN109147655A (en) | 2019-01-04 |
Family
ID=64808139
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811336407.6A Withdrawn CN109147655A (en) | 2018-11-12 | 2018-11-12 | A kind of LED display control system based on ARM |
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| CN (1) | CN109147655A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110554847A (en) * | 2019-08-29 | 2019-12-10 | 东莞锐视光电科技有限公司 | System, method and application for generating color stripe light by LCD display screen |
-
2018
- 2018-11-12 CN CN201811336407.6A patent/CN109147655A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110554847A (en) * | 2019-08-29 | 2019-12-10 | 东莞锐视光电科技有限公司 | System, method and application for generating color stripe light by LCD display screen |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190104 |