CN106469543B - A kind of locomotive vehicle-mounted display control unit, system and method - Google Patents
A kind of locomotive vehicle-mounted display control unit, system and method Download PDFInfo
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- CN106469543B CN106469543B CN201510510085.2A CN201510510085A CN106469543B CN 106469543 B CN106469543 B CN 106469543B CN 201510510085 A CN201510510085 A CN 201510510085A CN 106469543 B CN106469543 B CN 106469543B
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Abstract
The invention discloses a kind of locomotive vehicle-mounted display control unit, system and method, device is based on programmable logic device, and includes: LCD control module, is written and read control to the data of processor module output, and the data are exported to LCD display module；Low-temperature heating control module drives external heating module to generate heat and heats to LCD display module when locomotive vehicle-mounted display control program temperature is lower than heating limit value；Overtemperature alarm control module drives external overtemperature alarm drive module to carry out overtemperature alarm when locomotive vehicle-mounted display control program temperature is higher than high temperature limit value；LED backlight control module generates pwm signal according to the variation of ambient brightness, and the pwm signal is exported to LCD display module and carries out brightness regulation.Apparatus of the present invention, system and method overcome the prior art and need a large amount of occupancy processor resources, versatility and not very practical, technological deficiency of the Primary Component in the presence of buying and halt production risk.
Description
Technical field
The present invention relates to a kind of locomotive vehicle-mounted electrical equipments, are applied to locomotive, motor-car, height more particularly, to one kind
Vehicular display control device, system and method for the rail traffic vehicles such as iron, urban rail, subway based on programmable logic device.
Background technique
The field of track traffic such as locomotive, motor-car, high-speed rail, urban rail, subway belong to the industry of a high safety type requirement, and
The running environment of vehicle and its severe, such as: operating temperature span is big, humidity is high, vibration is strong.Locomotive vehicle-mounted display control program
The man-machine interface important as rail traffic vehicles, some important informations being mainly responsible in display rolling stock operational process,
Such as: the speed of service, monitored picture, warning message.Therefore, the normal work of display control program is that vehicle safety operation can not
Or scarce a part.
It is needed for safety and application, locomotive vehicle-mounted display control program is required to automatic with LCD backlight at present
It adjusts, system overheat is alarmed and the basic functions such as LCD low-temperature heat function.Currently, common locomotive vehicle-mounted display control program
There are mainly two types of:
The first scheme are as follows: the microprocessor arrangement with LCD controller is used, such as: Intel processor PXA255, by micro-
Processor is controlled.The program no longer needs additionally to build LCD control circuit since microprocessor carries LCD controller,
But still need to build other function block circuits, and a large amount of GPIO resources of microprocessor can be occupied.Its disadvantage mainly has:
(1) since LCD display control belongs to high-speed data processing, the partial data for occupying microprocessor is handled into energy
Power also brings certain power consumption to microprocessor, brings certain risk for the normal operation of microprocessor；
(2) since microprocessor carries the limitation of LCD function, when LCD type number changes (such as resolution ratio increase),
The program will be unable to meet new application demand；
(3) functions such as low-temperature heat are required to microprocessor and are controlled, and need to occupy microprocessor a large amount of
GPIO resource, or will lead to the resource of microprocessor and be unable to satisfy application demand；
(4) since the processor upgrade replacement is relatively fast, core devices face the risk of halt production at any time.
Second scheme are as follows: use MCU+ASIC control program.The LCD control function of the program is realized by ASIC, other
Functional block need to build external circuit, and be controlled by MCU.Its major defect has:
(1) ASIC type selecting is difficult, is difficult to find a kind of chip of entirely appropriate locomotive vehicle-mounted display control program, most of
In the case of, ASIC is unable to satisfy the functions such as low-temperature heat, temperature alarm；
(2) general ASIC is to meet the needs of market is general, and LCD control function compatibility is relatively high, is such as had a variety of
Distinct interface, a variety of image procossing modes etc., many functions are in idle state in specific application, inevitably result in money
The waste in source；
(3) asic chip will face the non-controllable risks factors such as buying difficulty or halt production.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of locomotive vehicle-mounted display control unit, system and method, it can
Overcome needs of the existing technology are a large amount of to occupy processor resources, versatility and not very practical, Primary Component has buying
With the technological deficiency of halt production risk.
In order to achieve the above-mentioned object of the invention, the present invention specifically provides a kind of technology reality of locomotive vehicle-mounted display control unit
Existing scheme, locomotive vehicle-mounted display control unit, the locomotive vehicle-mounted display control unit are based on programmable logic device, and device connects
It connects between processor module and LCD display module, and includes:
LCD control module is written and read control to the data of processor module output, and the data is exported to institute
LCD display module is stated, the LCD control module is also connected with the external memory module for reading and writing data；
Low-temperature heating control module, when including the locomotive vehicle-mounted display control unit, processor module, LCD display mould
When locomotive vehicle-mounted display control program temperature including block and memory module is lower than heating limit value, external heated mould is driven
Block generates heat and heats to the LCD display module；
Overtemperature alarm control module, when including the locomotive vehicle-mounted display control unit, processor module, LCD display mould
When locomotive vehicle-mounted display control program temperature including block and memory module is higher than high temperature limit value, external overtemperature report is driven
Alert drive module carries out overtemperature alarm；
LED backlight control module generates pwm signal according to the variation of ambient brightness, and the pwm signal is exported to described
LCD display module carries out brightness regulation.
Preferably, the locomotive vehicle-mounted display control unit further includes the register mould being connected with the processor module
Block, the register module further comprise LCD display register, and the processor module is into the LCD display register
The configuration parameter including LCD type, resolution ratio, color depth is written.
Preferably, the register module further includes LED backlight register, and the processor module is according to ambient brightness
Change to the LED backlight register and occurrence is written, the LED backlight control module generates pwm signal according to the occurrence.
Preferably, the locomotive vehicle-mounted display control unit further includes data input buffer module and data output caching mould
Block, the processor module control mould with the LCD control module, low-temperature heat respectively by the data input buffer module
Block, overtemperature alarm control module, register module are connected.The LCD control module, low-temperature heating control module, overtemperature alarm
Control module, LED backlight control module pass through the data output buffer module output data.
Preferably, when the LCD control module includes frame data control module, arbitration modules, storage control module, LCD
Sequence control module and FIFO, the storage control module are connected with memory module.The frame data control module will be from
The 16bit data of the data input buffer module match forming 32bit image data with 32bit bus, and wait institute
State the administrative power that arbitration modules distribute the memory module.If the arbitration modules divide the administrative power of the memory module
Frame data control module described in dispensing, then the frame data control module is by the storage control module by 32bit picture number
According in the write-in memory module.Otherwise, the LCD time-sequence control module generates the address for reading the memory module, and
Corresponding data in the memory module are read by the storage control module, then will by the LCD time-sequence control module
32bit image data is written into the FIFO, and the LCD time-sequence control module is wanted according to the timing of the LCD display module
It asks and the data in the FIFO is successively sent to the data output buffer module, exported by the data output buffer module
16bit image data.
Preferably, the locomotive vehicle-mounted display control unit further includes reseting module and DCM module, when the locomotive vehicle-mounted
After display control unit powers on, external reset circuit triggers the reseting module, to the locomotive vehicle-mounted display control unit
Internal all registers are resetted, and are then generated the locomotive vehicle-mounted display control unit by the DCM module and are run institute
The clock needed.
Preferably, the programmable logic device uses Xilinx XC3S400 type FPGA.
Preferably, when including the locomotive vehicle-mounted display control unit, processor module, LCD display module and memory
When locomotive vehicle-mounted display control program temperature including module is higher than high temperature limit value, the overtemperature alarm control module driving is outer
The overtemperature alarm drive module in portion carries out overtemperature alarm, while the processor module drives the LED backlight control module drop
The brightness value of the low LCD display module.
In addition the present invention also specifically provides a kind of technic relization scheme of locomotive vehicle-mounted display control program, locomotive vehicle-mounted
Display control program, comprising: processor module, LCD display module, memory module, and locomotive vehicle-mounted as described above are aobvious
Show control device.
Preferably, the processor module uses parallel port mode as the host computer of the locomotive vehicle-mounted display control program
Be connected with the locomotive vehicle-mounted display control unit, wherein the locomotive vehicle-mounted display control unit and the processor module it
Between use 16bit data/address bus.
Preferably, the system also includes heating module, overtemperature alarm drive module and signal conversion module, the heating
Module is connected by the data output buffer module with the low-temperature heating control module, and the overtemperature alarm drive module is logical
The data output buffer module is crossed to be connected with the overtemperature alarm control module.The signal conversion module passes through the data
Output buffer module is connected with the FIFO, the TTL electricity that the signal conversion module exports the data output buffer module
Head up display registration evidence is converted to LVDS level and shows data and export to the LCD display module.
Preferably, the system also includes crystal oscillator, reset circuit and power management module, the crystal oscillator and the locomotive
The DCM module for carrying display control unit is connected, the reseting module of the reset circuit and the locomotive vehicle-mounted display control unit
It is connected, the power management module provides power supply for the locomotive vehicle-mounted display control program.
Preferably, the programmable logic device uses FPGA, and the memory module is shown as the locomotive vehicle-mounted
The video memory of control device is connected using two panels SRAM, makes the number of the locomotive vehicle-mounted display control unit and the memory module
Reach 32bit according to highway width.
A kind of in addition technology that the present invention also specifically provides locomotive vehicle-mounted display control method based on above system is real
Existing scheme, locomotive vehicle-mounted display control method, comprising the following steps:
The data that S100:LCD control module exports the processor module are written and read control, and the data are exported
To LCD display module；
S101: when the temperature of the locomotive vehicle-mounted display control program is lower than heating limit value, low-temperature heat controls mould
It is that the LCD display module is heated that block driving heating module, which generates heat,；
S102: when the temperature of the locomotive vehicle-mounted display control program is higher than high temperature limit value, overtemperature alarm controls mould
Block drives overtemperature alarm drive module to carry out overtemperature alarm；
S103:LED backlight control module according to the variation of ambient brightness generate pwm signal, and by the pwm signal export to
The LCD display module carries out brightness regulation；
Step S100~step the S103 is executed parallel.
Preferably, the step S102 further comprises following procedure:
When the temperature of the locomotive vehicle-mounted display control program is higher than high temperature limit value, the overtemperature alarm control module
Overtemperature alarm drive module outside driving carries out overtemperature alarm, while the processor module drives the LED backlight control
Module reduces the brightness value of the LCD display module.
Preferably, the step S100 further comprises following procedure:
S1001: the locomotive vehicle-mounted display control unit powers on, and reset circuit triggers reseting module, to the locomotive
Register all inside display control unit is carried to be resetted；
S1002:DCM module generates clock required for the locomotive vehicle-mounted display control unit is run, and to it is different when
Phase relation between clock is managed；
S1003: it includes LCD type, resolution ratio, color depth that the processor module is written into LCD display register
Configuration parameter inside；
S1004: frame data control module by from the 16bit data of data input buffer module and 32bit bus into
Row matching forms 32bit image data；
S1005: the administrative power of arbitration modules distribution memory module is waited；
S1006: if the administrative power of the memory module is distributed to the frame data control module by the arbitration modules,
Then 32bit image data is written in the memory module by storage control module for the frame data control module；
S1007: if the administrative power of memory module is not distributed to the frame data control module by the arbitration modules,
LCD time-sequence control module generates the address for reading the memory module, and reads the storage by the storage control module
Corresponding data in device module；
S1008: 32bit image data is written into FIFO the LCD time-sequence control module；
S1009: the LCD time-sequence control module will be in the FIFO according to the timing requirements of the LCD display module
Data are successively sent to data output buffer module；
S1010: the data output buffer module exports 16bit image data；
S1011: the Transistor-Transistor Logic level that the data output buffer module exports is shown that data are converted to by signal conversion module
LVDS level shows data and exports to the LCD display module；
S1012: the LCD display module performs image display.
By implementing locomotive vehicle-mounted display control unit, the system and method that aforementioned present invention provides, have following beneficial
Effect:
(1) locomotive vehicle-mounted display control unit of the present invention is based on programmable logic device, can according to need programming and realizes
LCD control, low-temperature heat, backlight automatic adjustment and overtemperature alarm control etc. multiple functions, it is no longer necessary to using microprocessor into
Row control, alleviates the load of microprocessor；
(2) locomotive vehicle-mounted display control unit of the present invention is based on programmable logic device, compared to other chips, may be programmed
Logical device has unrivaled advantage in the processing of high-speed data, and circuit structure letter can be designed according to application requirement
Single, easily scalable LCD controller, to improve the availability and reliability of display control program；
(3) locomotive vehicle-mounted display control unit of the present invention uses programmable logic device, in particular by XILINX company
XC3S400 type fpga chip, the market of programmable logic device (the especially Xilinx XC3S400 type FPGA) chip is protected
The amount of having is big, the source of goods is stable, delivery cycle is longer, avoids the risk that chip stops production and buying is difficult.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described.It should be evident that the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other embodiments are obtained according to these attached drawings.
Fig. 1 is a kind of system structure diagram of specific embodiment of locomotive vehicle-mounted display control program of the present invention；
Fig. 2 is a kind of control flow schematic diagram of specific embodiment of locomotive vehicle-mounted display control method of the present invention；
In figure: 1- locomotive vehicle-mounted display control unit, 2- processor module, 3-LCD display module, 4- memory module.
Specific embodiment
For the sake of quoting and understanding, will hereafter used in technical term, write a Chinese character in simplified form or abridge and be described below:
FPGA:Field-Programmable Gate Array, the abbreviation of field programmable gate array；
CPLD:Complex Programmable Logic Device, the abbreviation of Complex Programmable Logic Devices；
ASIC:Application Specific Integrated Circuit, the abbreviation of specific integrated circuit；
GPIO:General Purpose Input Output, universal input/output interface abbreviation；
MCU:Microcontroller Unit, the abbreviation of micro-control unit；
LCD:Liquid Crystal Display, the abbreviation of liquid crystal display；
LED:Light Emitting Diode, the abbreviation of light emitting diode；
PWM:Pulse-Width Modulation, the abbreviation of pulse width modulation；
SRAM Static Random Access Memory, the abbreviation of static random access memory；
TFT-LCD:Thin Film Transistor-LCD, the abbreviation of thin film transistor liquid crystal display；
TTL:Transistor Transistor Logic, the abbreviation of transistor-transistor logic, Transistor-Transistor Logic level signal by
TTL device generates；
LVDS:Low-Voltage Differential Signaling, the abbreviation of low-voltage differential signal；
DCM:Digital Clock Manager, the abbreviation of digital dock management；
FIFO:First Input First Output, the abbreviation of push-up storage；
A kind of Bit: bit data type.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical scheme in the embodiment of the invention is clearly and completely described.Obviously, described embodiment is only
It is only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
Art personnel every other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
As shown in Figure 1 and Figure 2, give locomotive vehicle-mounted display control unit of the present invention, system and method it is specific
Embodiment, the present invention will be further explained below with reference to the attached drawings and specific examples.
As shown in Fig. 1, a kind of specific embodiment of locomotive vehicle-mounted display control unit, locomotive vehicle-mounted display control unit
1 based on the programmable logic device including FPGA or CPLD etc., and device is connected to processor module 2 and LCD display module 3
Between, and include:
LCD control module, the data exported to processor module 2 are written and read control, and the data are exported to LCD and are shown
Show that module 3, LCD control module are also connected with the external memory module 4 for reading and writing data；
Low-temperature heating control module, when including locomotive vehicle-mounted display control unit 1, processor module 2, LCD display module 3
When with the locomotive vehicle-mounted display control program temperature including memory module 4 lower than heating limit value, external heated mould is driven
Block generates heat and heats to LCD display module 3；
Overtemperature alarm control module, when including locomotive vehicle-mounted display control unit 1, processor module 2, LCD display module 3
When being higher than high temperature limit value with the locomotive vehicle-mounted display control program temperature including memory module 4, external overtemperature report is driven
Alert drive module carries out overtemperature alarm；
LED backlight control module generates pwm signal according to the variation of ambient brightness, and the pwm signal is exported to LCD
Display module 3 carries out brightness regulation.
Locomotive vehicle-mounted display control unit 1 still further comprises the register module being connected with processor module 2, register
Module further comprises LCD display register, and processor module 2 is written including LCD type into LCD display register, differentiates
Configuration parameter including rate, color depth.Register module further includes LED backlight register, and processor module 2 is bright according to environment
Occurrence is written to LED backlight register in the variation of degree, and LED backlight control module generates pwm signal according to the occurrence.
Locomotive vehicle-mounted display control unit 1 still further comprises data input buffer module and data output buffer module,
Processor module 2 by data input buffer module respectively with LCD control module, low-temperature heating control module, overtemperature alarm control
Molding block, register module are connected.LCD control module, low-temperature heating control module, overtemperature alarm control module, LED backlight control
Molding block passes through data output buffer module output data.
As a kind of typical specific embodiment of the present invention, LCD control module further comprises frame data control module, secondary
Module, storage control module, LCD time-sequence control module and FIFO, storage control module is cut out to be connected with memory module 4.Frame number
To match to form 32bit image with 32bit bus from the 16bit data of data input buffer module according to control module
Data, and wait the administrative power of arbitration modules distribution memory module 4.If arbitration modules divide the administrative power of memory module 4
Dispensing frame data control module, then by storage control module memory is written in 32bit image data by frame data control module
In module 4.Otherwise, LCD time-sequence control module generates the address for reading memory module 4, and is deposited by storage control module reading
Corresponding data in memory modules 4, then 32bit image data is written into FIFO by LCD time-sequence control module, LCD timing
Data in FIFO are successively sent to data output buffer module according to the timing requirements of LCD display module 3 by control module, by
Data output buffer module exports 16bit image data.
Locomotive vehicle-mounted display control unit 1 further includes reseting module and DCM module, when locomotive vehicle-mounted display control unit 1
After powering on, external reset circuit triggers reseting module, and the register all to 1 inside of locomotive vehicle-mounted display control unit carries out
It resets, locomotive vehicle-mounted display control unit 1 is then generated by DCM module and runs required clock.
When including locomotive vehicle-mounted display control unit 1, processor module 2, LCD display module 3 and memory module 4
Locomotive vehicle-mounted display control program temperature be higher than high temperature limit value when, overtemperature alarm control module driving outside overtemperature alarm
Drive module carries out overtemperature alarm, and simultaneous processor module 2 drives the brightness of LED backlight control module reduction LCD display module 3
Value.
The locomotive vehicle-mounted display control unit of aforementioned present invention specific embodiment description, comprising: LCD control module 1, low temperature
Four heating control module, LED backlight control module and overtemperature alarm control module parts, circuit structure is simple and reliable, upgrading
It is all very convenient with safeguarding.Meanwhile the locomotive vehicle-mounted display control unit of specific embodiment of the invention description makes full use of and can compile
Journey logical device, the especially advantage of FPGA parallel data processing speed, by the data bandwidth of locomotive vehicle-mounted display control unit
It is double, can single treatment 32bit data, not only reduce the working frequency of FPGA in this way, and also reduce to video memory read and write
The high dependency of speed.
A kind of specific embodiment of locomotive vehicle-mounted display control program, comprising: processor module 2, is deposited at LCD display module 3
Memory modules 4, and locomotive vehicle-mounted display control unit 1 as described above.Processor module 2 is used as locomotive vehicle-mounted display control
The host computer of system is connected using parallel port mode with locomotive vehicle-mounted display control unit 1, wherein locomotive vehicle-mounted display control unit 1
16bit data/address bus is used between processor module 2.As a kind of typical specific embodiment of the present invention, programmable logic
Device further uses Xilinx XC3S400 type fpga chip.
System further includes heating module, overtemperature alarm drive module and signal conversion module, and heating module is defeated by data
Cache module is connected with low-temperature heating control module out, and overtemperature alarm drive module passes through data output buffer module and overtemperature report
Alert control module is connected.Signal conversion module is connected by data output buffer module with FIFO, and signal conversion module is by data
The Transistor-Transistor Logic level of output buffer module output shows that data are converted to LVDS level and show data and export to LCD display module 3.
System further includes crystal oscillator, reset circuit and power management module, and crystal oscillator is controlled as clock source and locomotive vehicle-mounted display
The DCM module of device 1 processed is connected.Reset circuit is connected with the reseting module of locomotive vehicle-mounted display control unit 1, is locomotive vehicle-mounted
Display control program provides reset function.Power management module provides power supply for locomotive vehicle-mounted display control program.It is programmable to patrol
It collects device and uses FPGA, memory module 4 is connected using two panels SRAM as the video memory of locomotive vehicle-mounted display control unit 1, made
Locomotive vehicle-mounted display control unit 1 and the data-bus width of memory module 4 reach 32bit.As a kind of typical case of the present invention
Specific embodiment, the hardware circuit of the locomotive vehicle-mounted display control program based on FPGA specifically includes: a piece of FPGA is as system
System main control chip, the XC3S400-FT256 of model Xilinx company.Video memory of the two panels SRAM as LCD control module 1, and
Using the concatenated mode of two panels SRAM, data-bus width is made to reach 32bit(1 piece 16bit).LCD display module 3 is as aobvious
The controlled device for showing control system, using the TFT-LCD of Mitsubishi model AA121XN01, the TFT-LCD of the model is differentiated
Rate is 1024x768, has LVDS interface, and be integrated with LED backlight drive module.Signal conversion module is as TFT-LCD liquid
Signal conversion circuit between crystalline substance screen and FPGA, is converted to LVDS level for the Transistor-Transistor Logic level that data output buffer module exports.It is low
Warm heating control module is heated when system temperature is lower than limiting temperature for liquid crystal display.Overtemperature alarm drive module drives bee
The device that rings carries out overtemperature alarm, and in system overheat, driving buzzer is alarmed.
As shown in Fig. 2, a kind of specific embodiment of the locomotive vehicle-mounted display control method based on above system, including with
Lower step:
The data that S100:LCD control module exports processor module 2 are written and read control, and by the data export to
LCD display module 3；
S101: when the temperature of locomotive vehicle-mounted display control program is lower than heating limit value, low-temperature heating control module is driven
It is that LCD display module 3 is heated that dynamic heating module, which generates heat,；
S102: when the temperature of locomotive vehicle-mounted display control program is higher than high temperature limit value, overtemperature alarm control module is driven
Dynamic overtemperature alarm drive module carries out overtemperature alarm；
Low-temperature heating control module function when the temperature of display control program is lower than heating temperature limit value, inside FPGA
It can be opened, FPGA will drive heating module at this time, generate heat as TFT-LCD heating；When temperature is limited higher than heating temperature
When value, the low-temperature heating control module function inside FPGA is closed, and TFT-LCD is heated in stopping；
S103:LED backlight control module according to the variation of ambient brightness generate pwm signal, and by the pwm signal export to
LCD display module 3 carries out brightness regulation；
Above-mentioned steps S100~step S103 is executed parallel.
Step S102 further comprises following procedure:
When the temperature of locomotive vehicle-mounted display control program is higher than high temperature limit value, overtemperature alarm control module function is beaten
It opens, the overtemperature alarm drive module (i.e. buzzer drive module) outside the driving of overtemperature alarm control module carries out overtemperature alarm,
Make buzzer call, carries out system overheat alarm.Meanwhile cooling processing is carried out to display control program, as processor module 2 drives
Dynamic LED backlight control module reduces the brightness value of LCD display module 3.When the temperature of display control program is lower than high temperature limit value
When, buzzer will be closed.
Step S100 further comprises following procedure:
S1001: locomotive vehicle-mounted display control unit 1 powers on, and reset circuit triggers reseting module, shows and controls to locomotive vehicle-mounted
All registers in 1 inside of device processed are resetted；
S1002:DCM module generates locomotive vehicle-mounted display control unit 1 and runs required clock, and to different clocks it
Between phase relation be managed；
S1003: processor module 2 is written including LCD type, resolution ratio, color depth into LCD display register
Configuration parameter；
S1004: frame data control module by from the 16bit data of data input buffer module and 32bit bus into
Row matching forms 32bit image data；
S1005: the administrative power of arbitration modules distribution memory module 4 is waited；
S1006: if the administrative power of memory module 4 is distributed to frame data control module, frame data control by arbitration modules
32bit image data is written in memory module 4 by storage control module for molding block；
S1007: if the administrative power of memory module 4 is not distributed to frame data control module, LCD timing control by arbitration modules
Molding block generates the address for reading memory module 4, and reads corresponding data in memory module 4 by storage control module；
32bit image data is written into FIFO S1008:LCD time-sequence control module；
S1009:LCD time-sequence control module successively sends the data in FIFO according to the timing requirements of LCD display module 3
To data output buffer module；
S1010: data output buffer module exports 16bit image data；
S1011: the Transistor-Transistor Logic level that data output buffer module exports is shown that data are converted to LVDS electricity by signal conversion module
Head up display registration evidence is simultaneously exported to LCD display module 3；
S1012:LCD display module 3 performs image display.
By implementing locomotive vehicle-mounted display control unit, the system and method for specific embodiment of the invention description, Neng Gouda
To following technical effect:
(1) the locomotive vehicle-mounted display control unit, system and method for specific embodiment of the invention description are based on programmable patrol
Device is collected, programming is can according to need and realizes that LCD control, low-temperature heat, backlight automatic adjustment and overtemperature alarm control etc. are a variety of
Function, it is no longer necessary to be controlled using microprocessor, alleviate the load of microprocessor；
(2) the locomotive vehicle-mounted display control unit, system and method for specific embodiment of the invention description are based on programmable patrol
Volume device, compared to other chips, programmable logic device has unrivaled advantage in the processing of high-speed data, can be with
The LCD controller that circuit structure is simple, easily scalable is designed according to application requirement, to improve the available of display control program
Property and reliability；
(3) programmable logic of the locomotive vehicle-mounted display control unit, system and method for specific embodiment of the invention description
Device uses the XC3S400 type fpga chip of XILINX company, and the fpga chip market maintenance is big, the source of goods is stable, the supply of material is all
Phase is longer, avoids the risk that chip stops production and buying is difficult.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention is disclosed as above with preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, in the case where not departing from Spirit Essence of the invention and technical solution, all using in the methods and techniques of the disclosure above
Appearance makes many possible changes and modifications or equivalent example modified to equivalent change to technical solution of the present invention.Therefore,
Anything that does not depart from the technical scheme of the invention are made to the above embodiment any simple according to the technical essence of the invention
Modification, equivalent replacement, equivalence changes and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (13)
1. a kind of locomotive vehicle-mounted display control unit, which is characterized in that the locomotive vehicle-mounted display control unit (1) is based on to compile
Journey logical device, described device is connected between processor module (2) and LCD display module (3), and includes:
LCD control module is written and read control to the data of the processor module (2) output, and the data is exported to institute
It states LCD display module (3), the LCD control module is also connected with the memory module (4) for reading and writing data；
Low-temperature heating control module is shown when including the locomotive vehicle-mounted display control unit (1), processor module (2), LCD
When locomotive vehicle-mounted display control program temperature including module (3) and memory module (4) is lower than heating limit value, driving is external
Heating module generate heat the LCD display module (3) is heated；
Overtemperature alarm control module is shown when including the locomotive vehicle-mounted display control unit (1), processor module (2), LCD
When locomotive vehicle-mounted display control program temperature including module (3) and memory module (4) is higher than high temperature limit value, driving is external
Overtemperature alarm drive module carry out overtemperature alarm；
LED backlight control module generates pwm signal according to the variation of ambient brightness, and the pwm signal is exported to the LCD
Display module (3) carries out brightness regulation；
The locomotive vehicle-mounted display control unit (1) further includes the register module being connected with the processor module (2), described
Register module includes LED backlight register, and the processor module (2) is according to the variation of ambient brightness to the LED backlight
Occurrence is written in register, and the LED backlight control module generates pwm signal according to the occurrence；
The locomotive vehicle-mounted display control unit (1) further includes data input buffer module and data output buffer module, described
Processor module (2) by the data input buffer module respectively with the LCD control module, low-temperature heating control module,
Overtemperature alarm control module, register module are connected；The LCD control module, low-temperature heating control module, overtemperature alarm control
Module, LED backlight control module pass through the data output buffer module output data；
The LCD control module include frame data control module, arbitration modules, storage control module, LCD time-sequence control module and
FIFO, the storage control module are connected with memory module (4)；The frame data control module will be defeated from the data
Enter the 16bit data of cache module and 32bit bus match forming 32bit image data, and waits the arbitration modules
Distribute the administrative power of the memory module (4)；If the arbitration modules distribute to the administrative power of the memory module (4)
The frame data control module, then the frame data control module is write 32bit image data by the storage control module
Enter in the memory module (4)；Otherwise, the LCD time-sequence control module generates the address for reading the memory module (4),
And corresponding data in the memory module (4) are read by the storage control module, then by the LCD timing control mould
32bit image data is written into the FIFO block, and the LCD time-sequence control module is according to the LCD display module (3)
Data in the FIFO are successively sent to the data output buffer module by timing requirements, export caching mould by the data
Block exports 16bit image data.
2. locomotive vehicle-mounted display control unit according to claim 1, it is characterised in that: the register module is further
Including LCD display register, write-in includes LCD type, differentiates in processor module (2) the Xiang Suoshu LCD display register
Configuration parameter including rate, color depth.
3. locomotive vehicle-mounted display control unit according to claim 2, it is characterised in that: the locomotive vehicle-mounted display control
Device (1) further includes reseting module and DCM module, after the locomotive vehicle-mounted display control unit (1) powers on, external reset
Circuit triggers the reseting module, resets to the internal all registers of the locomotive vehicle-mounted display control unit (1), with
Clock required for the locomotive vehicle-mounted display control unit (1) runs is generated by the DCM module afterwards.
4. according to claim 1,2 or 3 described in any item locomotive vehicle-mounted display control units, it is characterised in that: described to compile
Journey logical device uses Xilinx XC3S400 type FPGA.
5. locomotive vehicle-mounted display control unit according to claim 4, it is characterised in that: when aobvious including the locomotive vehicle-mounted
Show the locomotive vehicle-mounted display control including control device (1), processor module (2), LCD display module (3) and memory module (4)
When system temperature processed is higher than high temperature limit value, the overtemperature alarm drive module outside the overtemperature alarm control module driving is carried out
Overtemperature alarm, while the processor module (2) drives the LED backlight control module to reduce the LCD display module (3)
Brightness value.
6. a kind of locomotive vehicle-mounted display control program characterized by comprising processor module (2), LCD display module (3),
Memory module (4), and such as locomotive vehicle-mounted display control unit (1) described in any one of claim 1 to 5.
7. locomotive vehicle-mounted display control program according to claim 6, it is characterised in that: the processor module (2) is made
Parallel port mode and locomotive vehicle-mounted display control unit (1) phase are used for the host computer of the locomotive vehicle-mounted display control program
Even, wherein using 16bit data/address bus between the locomotive vehicle-mounted display control unit (1) and the processor module (2).
8. locomotive vehicle-mounted display control program according to claim 6, it is characterised in that: the system also includes heated moulds
Block, overtemperature alarm drive module and signal conversion module, the heating module by the data output buffer module with it is described
Low-temperature heating control module is connected, and the overtemperature alarm drive module passes through the data output buffer module and the overtemperature report
Alert control module is connected；The signal conversion module is connected by the data output buffer module with the FIFO, the letter
The Transistor-Transistor Logic level that the data output buffer module exports is shown that data are converted to LVDS level and show data simultaneously by number conversion module
It exports to the LCD display module (3).
9. locomotive vehicle-mounted display control program according to claim 7 or 8, it is characterised in that: the system also includes crystalline substances
Vibration, reset circuit and power management module, the crystal oscillator are connected with the DCM module of the locomotive vehicle-mounted display control unit (1),
The reset circuit is connected with the reseting module of the locomotive vehicle-mounted display control unit (1), and the power management module is institute
It states locomotive vehicle-mounted display control program and power supply is provided.
10. locomotive vehicle-mounted display control program according to claim 9, it is characterised in that: the programmable logic device
Using FPGA, the memory module (4) is gone here and there as the video memory of the locomotive vehicle-mounted display control unit (1) using two panels SRAM
Connection, makes the locomotive vehicle-mounted display control unit (1) and the data-bus width of the memory module (4) reach 32bit.
11. a kind of locomotive vehicle-mounted display control method based on any one of claim 6 to 10 system, which is characterized in that
The following steps are included:
The data that S100:LCD control module exports the processor module (2) are written and read control, and the data are exported
To LCD display module (3)；
S101: when the temperature of the locomotive vehicle-mounted display control program is lower than heating limit value, low-temperature heating control module is driven
It is that the LCD display module (3) are heated that dynamic heating module, which generates heat,；
S102: when the temperature of the locomotive vehicle-mounted display control program is higher than high temperature limit value, overtemperature alarm control module is driven
Dynamic overtemperature alarm drive module carries out overtemperature alarm；
S103:LED backlight control module generates pwm signal according to the variation of ambient brightness, and the pwm signal is exported to described
LCD display module (3) carries out brightness regulation；
Step S100~step the S103 is executed parallel.
12. locomotive vehicle-mounted display control method according to claim 11, which is characterized in that the step S102 is further
Including following procedure:
When the temperature of the locomotive vehicle-mounted display control program is higher than high temperature limit value, the overtemperature alarm control module driving
External overtemperature alarm drive module carries out overtemperature alarm, while the processor module (2) drives the LED backlight to control mould
Block reduces the brightness value of the LCD display module (3).
13. locomotive vehicle-mounted display control method according to claim 11 or 12, which is characterized in that the step S100 into
One step includes following procedure:
S1001: the locomotive vehicle-mounted display control unit (1) powers on, and reset circuit triggers reseting module, to the locomotive vehicle-mounted
The internal all registers of display control unit (1) are resetted；
S1002:DCM module generates clock required for the locomotive vehicle-mounted display control unit (1) runs, and to different clocks
Between phase relation be managed；
S1003: the processor module (2) is written into LCD display register to be existed including LCD type, resolution ratio, color depth
Interior configuration parameter；
S1004: frame data control module will be from the 16bit data of data input buffer module and the progress of 32bit bus
With forming 32bit image data；
S1005: the administrative power of arbitration modules distribution memory module (4) is waited；
S1006: if the administrative power of the memory module (4) is distributed to the frame data control module by the arbitration modules,
Then 32bit image data is written in the memory module (4) by storage control module for the frame data control module；
S1007: if the administrative power of memory module (4) is not distributed to the frame data control module, LCD by the arbitration modules
Time-sequence control module generates the address for reading the memory module (4), and reads the storage by the storage control module
Corresponding data in device module (4)；
S1008: 32bit image data is written into FIFO the LCD time-sequence control module；
S1009: the LCD time-sequence control module is according to the timing requirements of the LCD display module (3) by the number in the FIFO
According to being successively sent to data output buffer module；
S1010: the data output buffer module exports 16bit image data；
S1011: the Transistor-Transistor Logic level that the data output buffer module exports is shown that data are converted to LVDS electricity by signal conversion module
Head up display registration evidence is simultaneously exported to the LCD display module (3)；
S1012: the LCD display module (3) performs image display.
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| CN108128313B (en) * | 2017-11-29 | 2019-11-22 | 中车青岛四方机车车辆股份有限公司 | Train anti-freeze control method, device, storage medium and processor |
| CN108776644B (en) * | 2018-05-04 | 2022-09-27 | 中国电子科技集团公司第三十六研究所 | Data cache system and method and electronic equipment for spaceflight |
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| CN201522841U (en) * | 2009-11-19 | 2010-07-07 | 航天信息股份有限公司 | Lcd controller |
| CN103019270B (en) * | 2012-09-29 | 2015-09-30 | 中国北车集团大连机车研究所有限公司 | There is the engine driver display unit that low temperature preheats function |
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