CN110718188A - FPGA-based display screen control card output signal conversion method and device - Google Patents
FPGA-based display screen control card output signal conversion method and device Download PDFInfo
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- CN110718188A CN110718188A CN201911143219.6A CN201911143219A CN110718188A CN 110718188 A CN110718188 A CN 110718188A CN 201911143219 A CN201911143219 A CN 201911143219A CN 110718188 A CN110718188 A CN 110718188A
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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]
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Abstract
The invention belongs to the field of LED display screen control, and particularly relates to a method and a device for converting output signals of a control card of a display screen based on an FPGA (field programmable gate array), which are characterized by comprising the following steps of: obtaining a HUB code value of the LED display screen module; acquiring a display screen control card output signal; step three, operating a logic gate switch conversion program; and outputting signals meeting the requirements of the LED display screen module in the step three. The method uses a software form to realize the transfer of the output signal of the display screen control card to the LED display screen module, and has good compatibility. The invention can save the manufacture of various HUB plates and has considerable economic benefit; simple structure, easy preparation and good technical effect.
Description
Technical Field
The invention belongs to the field of LED display screen control, and particularly relates to a method and a device for converting output signals of a display screen control card based on an FPGA.
Background
The content that LED display screen shows comes from the display screen control card to its signal of input, and the output interface type of display screen control card is relatively fixed, but LED display screen module has multiple type interface, leads to need to set up the keysets between control card and the different LED display screen modules and just can accomplish the connection, and the keysets is the HUB board promptly, and each kind of LED display screen module corresponds a HUB code. Present LED display screen HUB board is equipped with buffer chip circuit, realize display screen control card output signal's conversion through pure hardware mode, that is to say each kind of display screen module need use a buffer chip circuit just can accomplish this HUB board and just export, LED display screen module has the interface of one hundred multiple standards, prior art corresponds just needs one hundred multiple HUB boards, LED display screen production test and debugging all need the suitable LED display screen HUB board of adaptation at every turn, inconvenience has been brought for maintaining.
Disclosure of Invention
The invention aims to provide a conversion method of an output signal of a display screen control card based on an FPGA (field programmable gate array), and provides an LED display screen HUB board based on the FPGA on the basis of the conversion method, so that the LED display screen HUB board is compatible with a plurality of types of LED display screen modules.
The technical scheme of the invention is as follows,
a conversion method of output signals of a display screen control card based on an FPGA comprises the following steps: acquiring a HUB code value of an LED display screen module; step two, obtaining a display screen control card output signal; step three, operating a logic gate switch conversion program corresponding to the HUB code value in the step one, and converting a display screen control card output signal into a signal required by the LED display screen module in the step one; and step four, outputting the signals required by the LED display screen module in the step three.
FPGA realizes the conversion of internal logic gate through software code, convert display screen control card output signal into the signal that accords with LED display screen module needs according to the HUB code value of input, each HUB code value corresponds the procedure of an internal logic gate conversion, FPGA prestores the internal logic gate conversion procedure that all HUB code values correspond, just can realize converting display screen control card output signal into the required signal of LED display screen module of any kind of interface type at a LED display screen HUB board. The method realizes the switching of the output signal of the display screen control card to the LED display screen module by using a software mode, and has the advantages of simple method and good compatibility effect.
The invention provides an LED display screen HUB board based on FPGA, which comprises a HUB interface unit connected with an LED display screen module, a display screen control card interface unit connected with a display screen control card, a HUB code setting unit, an FPGA control unit and a power supply unit,
the HUB code setting unit and the display screen control card interface unit are respectively connected with an input port of the FPGA control unit, the HUB interface unit is connected with an output port of the FPGA control unit, the HUB interface unit is a double-row needle base with the length of not less than 20P,
when the LED display screen control device works, the FPGA control unit carries out corresponding logic gate switching conversion on signals input by the display screen control card interface unit according to the HUB code value of the LED display screen module input by the HUB code setting unit, outputs the signals to the HUB interface unit,
the power supply unit provides required electric energy for the FPGA control unit.
Further, the HUB interface unit is a 40P double-row needle seat.
Furthermore, the FPGA control unit comprises an FPGA chip and a program downloading circuit connected with the FPGA chip.
Further, the HUB code setting unit is a dial switch.
Further, the dial switch is an 8-bit dial switch.
Furthermore, the display screen control card interface unit is a 50P double-row needle base.
Referring to fig. 4, according to the standard HUB interface definition of LED display screen in the art, although there are more than 100 standard HUB interfaces currently, the pin arrangement of the HUB port is only two rows and one row, the pin number of the HUB port has 10 bits, 14 bits, 16 bits, 20 bits, 26 bits, 30 bits, 32 bits, 34 bits, 40 bits, and the pin number is up to 40 bits. If the LED display screen HUB board HUB interface unit uses a 20P double-row needle base physical structure, the LED display screen standard HUB interface with the number of pins being 20 or below can be compatible (obviously, if the 40P double-row needle base physical structure is adopted, all the existing display screen standard HUB interfaces can be compatible), one end of the 20P double-row needle base is set as a reference on hardware, any LED display screen module is inserted in an aligned mode, a corresponding HUB code is input into the FPGA control unit, after the FPGA control unit receives a display screen control card signal, the FPGA control unit operates a corresponding logic door switch conversion program according to the HUB code, and the signal is output to the corresponding pin, so that the LED display screen module obtains a signal conforming to the definition of the LED display screen standard HUB interface.
The LED display screen HUB board greatly facilitates the production test and debugging maintenance of the LED display screen; various HUB plates can be saved, and the economic benefit is considerable; this LED display screen HUB simple structure, easy preparation, technological effect is good.
Drawings
FIG. 1 is a block diagram of a HUB board structure of an LED display screen based on FPGA according to an embodiment of the present invention;
FIG. 2 is a flow chart of the operation of the program built in the FPGA control unit according to the embodiment of the present invention;
fig. 3 is a schematic diagram of a hardware connection application structure of an LED display screen HUB board based on an FPGA according to an embodiment of the present invention;
fig. 4 is a schematic diagram comparing the standard HUB interface of the LED display screen with the HUB interface unit according to the embodiment of the present invention.
In the figure, 101, HUB interface unit, 102, HUB code setting unit, 103, FPGA control unit, 104, display screen control card interface unit, 105, power supply unit.
Detailed Description
The present invention will be described in detail with reference to the following examples, which are provided for illustration only and are not intended to limit the scope of the present invention.
Referring to fig. 1 to 4, an LED display screen HUB board based on FPGA comprises a HUB interface unit 101 connected with an LED display screen module, a display screen control card interface unit 104 connected with a display screen control card, a HUB code setting unit 102, an FPGA control unit 103 and a power supply unit 105,
the HUB code setting unit 102 and the display screen control card interface unit 104 are respectively connected with an input port of the FPGA control unit 103, the HUB interface unit 101 is connected with an output port of the FPGA control unit 103, the HUB interface unit 101 is a 40P double-row needle base, the 40P double-row needle base can be compatible with all the existing HUB interface standards of the LED display screen,
the power supply unit 105 supplies the FPGA control unit with the required power,
the FPGA control unit 103 of the embodiment uses an EP4CE10F17C8N chip of Cyclone IV E series of ALTERA company, the chip is packaged by FBGA-256, the number of logic Units (Units) is 10320, the maximum IO port number is 179, and the memory RAM bit number is 423936; because the number of IO ports of the chip is large, one chip can be connected with 3 40P double-row needle bases to serve as output signals of 3 HUB interface units 101, namely an LED display screen HUB board using the chip can be simultaneously connected with three LED display screen modules with the same interface, the working efficiency is high, the FPGA control unit 103 is also provided with a JTAG downloading circuit connected with the EP4CE10F17C8N chip to serve as a program downloading circuit, a logic gate switch conversion subprogram and other program codes corresponding to each HUB code are compiled in an upper computer such as a personal computer according to the standard HUB interface definition of the LED display screen, and the codes are downloaded to the EP4CE10F17C8N chip through the JTAG circuit, and the reference is shown in FIG. 3;
the HUB code setting unit 102 of this embodiment uses an 8-bit dial switch, the 8-bit dial switch is directly connected to the input port of the EP4CE10F17C8N chip, and the EP4CE10F17C8N chip directly obtains the HUB code through binary input, and the input mode has a simple structure, high efficiency and low cost, and certainly can also adopt other visual human-computer interaction modules for input;
the display screen control card interface unit 104 of this embodiment is a 50P double-row pin seat, the 50P double-row pin seat is a compatible interface commonly used by display screen control cards in the field, and certainly, other interfaces adapted to the display screen control card can be adopted according to actual needs;
during operation, this embodiment uses the MRV320 control card of Norwalk science and technology to be connected with the double needle file electricity of 50P, LED display screen module input interface is connected with the double needle file electricity of 40P, use the HUB code of 8 bit dial switch input LED display screen modules to EP4CE10F17C8N chip, EP4CE10F17C8N chip is according to the HUB code, call corresponding logic door switch conversion subprogram, carry out input/output to the signal of display screen control card input and switch on, with the corresponding row needle mouth of the double needle file of 40P of signal output, LED display screen module obtains the signal.
Referring to fig. 2, the program executed by the EP4CE10F17C8N chip in the present embodiment at least includes the following steps: firstly, judge the HUB code value of input, whether 8-bit dial switch input value belongs to the HUB code value in the LED display screen standard HUB interface definition table, secondly, according to HUB code operation corresponding logic gate switch conversion subprogram, this subprogram includes the base pin definition that corresponds with the HUB code and FPGA internal logic gate definition input output switches on 2 parts, for example when the LED display screen interface is 4 for the HUB code, then the HUB4 logic gate switch conversion subprogram that corresponds includes that accords with 20 base pin definitions that HUB4 standard corresponds and FPGA internal logic gate definition input output switch on 2 parts, for the sake of clarity, below provide part program source code and supply reference.
Using the state values of the 8-way dial switch as output conditions, the designated HUB conversion subroutine is executed
module select (sw,led);
input [7:0] sw// switch input signal, using 3 of the switches as inputs to a 3-8 decoder
ioutput [40:0] LED _ in = { A, B, C, D, L, S, O, E, R1, G1, U1, R2, G2, U2, R3, G3, U3, R4, G4, U4}, and/LED screen input signal definition, wherein 4 groups of RGB numbers exist in a single port of all HUB boards at most
The sw in brackets is a sensitive variable, when the sw changes, all statements in always are executed once, and otherwise, the statements are kept unchanged
always @ (sw)
begin
case (sw)// case statement, must be followed by default statement
3' b0000_ 0100:// conditional jump, binary 00000100 as decimal number 4, representing HUB4
Output [19:0] led _ out _ HUB4= { S, N1, L, N2, R, N3, G, N4, O, N5, A, N6, B, N7, C, N8, D, N9, N10, N11}, and/or 20 pin definitions input when HUB4 is set
// below is the HUB4 conversion subroutine
led_out_hub4.A=led_in.A;
led_out_hub4.B=led_in.B;
led_out_hub4.C=led_in.C;
led_out_hub4.D=led_in.D;
led_out_hub4.R=led_in.R1;
led_out_hub4.G=led_in.G1;
led_out_hub4.S=led_in.S;
led_out_hub4.L=led_in.L;
led_out_hub4.O=led_in.O;
led_out_hub4.N1 = led_out_hub4.N2 = led_out_hub4.N3 = led_out_hub4.N4 =led_out_hub4.N5 = led_out_hub4.N6 = led_out_hub4.N7 = led_out_hub4.N8 = led_out_hub4.N9 = led_out_hub4.N10 =led_out_hub4.N11 = 0;
3' b0000_ 0101:// conditional jump, binary 00000101 decimal number 5 representing HUB5
Output [15:0] led _ out _ HUB5= { N1, G, N2, R, O, B, N3, C, N4, D, N5, A, N6, L, N7, S }, and/or 16 pin definitions input when HUB5 is set
//……
The HUB plate conversion subroutine for more than 100 points in the HUB4 conversion process is omitted
//……
3' b0111_ 1111:// conditional jump, binary 01111101 decimal 127, representing HUB127
Output [19:0] led _ out _ HUB127= { R1, R2, R3, R4, G1, G2, G3, G4, U1, U2, U3, U4, A, B, S, N1, L, N2, O, N3 }, and/or 20 pin definitions input when HUB127 is set
//……
The conversion process is the same as HUB4
//……
default: ;
endcase
end
endmodule。
Claims (7)
1. A conversion method of display screen control card output signals based on FPGA is characterized by comprising the following steps: acquiring a HUB code value of an LED display screen module; step two, obtaining a display screen control card output signal; step three, operating a logic gate switch conversion program corresponding to the HUB code value in the step one, and converting a display screen control card output signal into a signal meeting the requirements of the LED display screen module in the step one; and step four, outputting signals meeting the requirements of the LED display screen module in the step three.
2. An LED display screen HUB board based on FPGA comprises a HUB interface unit (101) connected with an LED display screen module, a display screen control card interface unit (104) connected with a display screen control card, and is characterized by also comprising a HUB code setting unit (102), an FPGA control unit (103) and a power supply unit (105),
the HUB code setting unit (102) and the display screen control card interface unit (104) are respectively connected with an input port of the FPGA control unit (103), the HUB interface unit (101) is connected with an output port of the FPGA control unit (103),
the HUB interface unit (101) is a double-row needle base with the length of not less than 20P,
when the LED display screen control system works, the FPGA control unit (103) performs corresponding logic gate switching on a signal input by the display screen control card interface unit (104) according to the HUB code value of the LED display screen module input by the HUB code setting unit (102), outputs the signal to the HUB interface unit (101),
the power supply unit (105) provides required electric energy for the FPGA control unit.
3. The LED display HUB board according to claim 2, wherein the HUB interface unit (101) is a 40P double row HUB.
4. The LED display HUB board according to claim 2, characterized in that the FPGA control unit (103) comprises an FPGA chip and a program download circuit connected thereto.
5. The LED display screen HUB board according to claim 2, characterized in that the HUB code setting unit (102) is a dial switch.
6. The LED display HUB board of claim 5, wherein the dip switch is an 8-bit dip switch.
7. The LED display HUB board of claim 2, wherein the display control card interface unit (104) is a 50P double row pin header.
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Cited By (1)
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| CN111767177A (en) * | 2020-05-15 | 2020-10-13 | 广州视源电子科技股份有限公司 | Test method, test device, test equipment and storage medium for LED display screen control card |
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