CN112134619A - Method for realizing single-fiber bidirectional transmission between play controller and display terminal - Google Patents
Method for realizing single-fiber bidirectional transmission between play controller and display terminal Download PDFInfo
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- CN112134619A CN112134619A CN202011008158.5A CN202011008158A CN112134619A CN 112134619 A CN112134619 A CN 112134619A CN 202011008158 A CN202011008158 A CN 202011008158A CN 112134619 A CN112134619 A CN 112134619A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
- H04L67/025—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP] for remote control or remote monitoring of applications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/20—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video object coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/44—Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/439—Processing of audio elementary streams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
Abstract
The invention provides a method for realizing single-fiber bidirectional transmission between a play controller and a display terminal.A host computer outputs parallel video data to an SDI coding chip; the upper computer generates a control command data packet according to a frame format and sends the control command data packet to the microprocessor; the microprocessor sends the verification result to the SDI coding chip after passing the verification; the encoded audio/video data is sent to an OPS audio/video converter; the OPS audio-video converter converts the SDI signal embedded with the control command into an HDMI signal and a serial port signal and sends the HDMI signal and the serial port signal to the display terminal; and the OPS audio/video converter receives the state data returned by the display terminal, generates a data packet according to a frame format, converts the data packet into an optical signal and sends the optical signal to the upper computer. Has the advantages that: the SDI single-fiber bidirectional transmission system realizes bidirectional remote transmission of high-speed video signals and low-speed serial port control signals, and simultaneously realizes the functions of audio and video signal transmission, remote control of a display terminal and state query by using one optical fiber; the method has the advantages of simple wiring, easy installation and deployment, low cost and the like.
Description
Technical Field
The invention belongs to the technical field of a ground PIS (packet input system) system of rail transit, and particularly relates to a method for realizing single-fiber bidirectional transmission between a play controller and a display terminal.
Background
The LCD player controller, which is a core device of the sub-system of the subway PIS station, has an important function of receiving gateway commands of a control center, wherein the gateway commands include the realization of the on-off of a plurality of display terminals (such as LCD displays) of a station hall and a station platform, the status query of the display terminals, and the like. The traditional display terminal control modes include the following modes: 1. the remote controller is used, and is controlled through infrared emission, so that the efficiency is extremely low due to the need of local control of equipment, and the remote controller is eliminated. 2. The power controller is expensive, can only realize the switch screen and single control function, but controls and inquires the state of the display terminal and has larger uncertainty. 3. Through the mode of external serial ports, but need increase serial servers, except original video transmission cable, increased the control cable again. The above methods cannot well realize the functions of controlling and querying the state of the display terminal.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for realizing single-fiber bidirectional transmission between a play controller and a display terminal, which can effectively solve the problems.
The technical scheme adopted by the invention is as follows:
the invention provides a method for realizing single-fiber bidirectional transmission between a play controller and a display terminal, which is applied to a single-fiber bidirectional transmission system, wherein the single-fiber bidirectional transmission system comprises an LCD play controller, a passive optical splitter, an OPS audio/video converter and the display terminal;
the LCD player controller is provided with a plurality of optical interfaces, and each optical interface is IN bidirectional connection with an input end IN interface of the passive optical splitter through a single-core bidirectional optical fiber; the passive optical splitter is provided with a plurality of output end OUT interfaces, and each output end OUT interface of the passive optical splitter is IN bidirectional connection with an input end IN interface of the OPS audio/video converter through a single-core bidirectional optical fiber; the OPS audio/video converter is provided with an OPS interface; the OPS interface comprises a power interface, an audio and video interface and a UART communication interface; the OPS interface of the OPS audio-video converter is bidirectionally connected with the OPS interface of the display terminal;
the LCD playing controller comprises an upper computer and a video output module; the video output module comprises a microprocessor, an SDI coding chip and a plurality of optical modules; the 1 st interface of the upper computer is connected with the input end of the SDI coding chip; the 2 nd interface of the upper computer is bidirectionally connected with the 1 st serial port of the microprocessor; the 2 nd serial port of the microprocessor is bidirectionally connected with one end of each optical module; the microprocessor is bidirectionally connected with the SDI coding chip;
the OPS audio/video converter comprises a photoelectric conversion module, an electro-optical conversion module, a decoding circuit, a register, an HDMI coding chip and a single chip microcomputer;
the method for realizing single-fiber bidirectional transmission between the play controller and the display terminal comprises the following steps:
step 1, an upper computer outputs parallel video data, synchronous clock signals and audio data to an SDI coding chip through a parallel data output interface;
the upper computer generates a control command data packet for the appointed display terminal according to a frame format and sends the control command data packet to a No. 1 serial port of the microprocessor; the control command data packet carries a display terminal ID of a designated display terminal;
step 2, after the 1 st serial port of the microprocessor is powered on or reset and restarted, the initialization is firstly started, and the 1 st serial port and the 2 nd serial port continuously wait for receiving data;
when a 1 st serial port receives a control command data packet from an upper computer, firstly verifying the integrity and the validity of the control command data packet, if the verification fails, discarding the control command data packet, and reentering a data receiving waiting state; if the verification is passed, the control command data packet is sent to an SDI coding chip;
step 3, the SDI coding chip codes the parallel video data, the synchronous clock signals and the audio data sent by the upper computer into SDI audio and video signals, and embeds the control command data packet sent by the microprocessor into the SDI audio and video signals to obtain coded SDI signals; then sending the data to an optical module of a corresponding link;
step 4, the optical module performs electro-optical conversion on the coded SDI signal to convert the coded SDI signal into an optical SDI signal, and then transmits the optical SDI signal to a passive optical splitter through a single-core bidirectional optical fiber;
step 5, the passive optical splitter divides the received optical SDI signal into a plurality of branches, and each branch transmits the optical SDI signal to an OPS audio-video converter connected with the other end through a single-core bidirectional optical fiber;
step 6, after receiving the optical SDI signal, the OPS audio/video converter converts the optical SDI signal into an SDI electrical signal through a photoelectric conversion module, then a decoding circuit decodes the SDI electrical signal to obtain decoded original audio/video data, wherein the original audio/video data comprises parallel video data, a synchronous clock signal and audio data, and sends the original audio/video data to an HDMI coding chip; meanwhile, the decoding circuit generates an SDI locking signal for indicating that the original audio and video data is valid; in addition, if the SDI electric signal is embedded with a control command data packet, the decoding circuit also decodes the control command data packet at the same time; then, storing the decoded control command data packet into a register;
after the single chip microcomputer of the OPS audio/video converter is powered on or reset and restarted, initializing, after the initialization is completed, continuously reading a register by the single chip microcomputer, and executing the following operations 1 and 2:
operation 1: the single chip microcomputer judges whether an SDI locking signal exists or not, and if not, the SDI locking pin value is continuously read; if the SDI locking signal exists, configuring an HDMI coding chip, coding the parallel video data, the synchronous clock signal and the audio data by the HDMI coding chip to obtain HDMI audio and video streams, and outputting the HDMI audio and video streams to a display terminal to enable the display terminal to display the HDMI audio and video streams;
operation 2: the single chip microcomputer judges whether a control command data packet is obtained after decoding, and if not, the single chip microcomputer indicates that the optical SDI signal received by the OPS audio-video converter is only parallel audio-video data needing to be displayed; if yes, the single chip microcomputer checks the control command data packet, and if the check is incorrect, the control command data packet is discarded; if the verification is correct, further judging whether the display terminal ID carried in the control command data packet is the display terminal corresponding to the OPS audio/video converter, and if not, discarding the control command data packet; if yes, judging whether the control command data packet is a test command, if yes, executing step 7; if not, executing step 8;
step 7, the singlechip sends the control command data packet to an electro-optical conversion module, converts the control command data packet into an optical SDI signal, opens an optical port of the OPS audio-video converter, and sends the optical SDI signal to a passive optical splitter through a single-core bidirectional optical fiber; then, the singlechip closes the optical port;
the passive optical splitter sends the optical SDI signal to the LCD play controller;
the LCD playing controller receives an optical SDI signal returned by the OPS audio-video converter at a set time, and the optical SDI signal represents that the physical link communication from the LCD playing controller to the OPS audio-video converter is normal; otherwise, representing the communication fault of the physical link from the LCD playing controller to the OPS audio/video converter;
step 8, the singlechip analyzes the control command data packet, obtains the display terminal ID and the control command data which need to be controlled, opens an optical port, then sends the control command data to the corresponding display terminal to further control the display terminal, and then the singlechip enters a link of waiting for receiving a response message of the display terminal; when the waiting time is up, if the singlechip does not receive the response message returned by the display terminal, the singlechip closes the optical port;
if the single chip receives a response message returned by the display terminal, executing the step 9;
step 9, the single chip microcomputer packs the response message according to a frame format, converts the response message into an optical serial port signal through an electro-optical conversion module, and then sends the optical serial port signal to a passive optical splitter through a single-core bidirectional optical fiber; then, the passive optical splitter sends the optical serial port signal to the LCD playing controller, and the function that the display terminal returns to the state of the LCD playing controller is achieved.
Preferably, in step 1, the upper computer generates a control command data packet for the designated display terminal in a frame format, where the frame structure of the control command data packet is as follows:
the frame structure of the control command data packet comprises 40 bytes in total;
the 1 st BYTE1 is a frame header, and the frame headers of all control command data packets are the same, so that if an error frame header is used, the whole control command data packet cannot be received by the OPS audio/video converter, and further, the error sending of an upper computer is prevented; the header uses 0/1 non-adjacent bytes;
BYTE2, BYTE2, is the display terminal ID: specifically, the display terminal ID is a display terminal ADDRESS, which is an ADDRESS set by a 5-bit dial switch on an OPS audio/video converter embedded in the display terminal; because the OPS audio-video converters correspond to the display terminals one by one, the address of the OPS audio-video converters uniquely identifies the corresponding display terminals;
BYTE3, BYTE3, is a retransmit flag: wherein 0x00 represents an entirely new command; 0x01 indicates that the same command is retransmitted for the 1 st time; 0x02 indicates that the same command is retransmitted a second time, and so on; if the same command needs to be retransmitted once, the retransmission mark needs to be modified, and the OPS audio/video converter can respond;
BYTE4, BYTE4, is the display terminal model; wherein, 0xF0 is used to detect whether the physical link is normally connected, that is: after the system is connected, the upper computer sends a test command to each OPS audio/video converter, the OPS audio/video converters return response data fixed by the upper computer after receiving the test command, and after the upper computer receives and verifies the response data, the upper computer obtains the conclusion that the whole signal link is normally connected and the address of the OPS audio/video converters is correctly set, so that the OPS audio/video converters and the upper computer can normally communicate;
0xA _, 0xB _, 0xC _, 0xD _, 0xE _, and so on, representing the display terminal model of a specific brand;
BYTE5, BYTE5, represents the display terminal command BYTE length: the system can be compatible with various brand display terminals, the control commands of different brand display terminals have larger difference, and even if the display terminals of the same brand are used, the byte numbers of different control commands can be different. The BYTE5 BYTE in the frame format is used to indicate the number of BYTEs commanded by the display terminal, i.e.: the device comprises a display terminal command area, an OPS audio/video converter, a display terminal command area and a display terminal control area, wherein the display terminal command area is used for transmitting the number of bytes actually occupied by the display terminal command in 33 bytes of the display terminal command area, and the bytes are used for extracting the display terminal command by the OPS audio/video converter; BYTE5 fixes bits 0x21 when BYTE4 is 0xF 0;
BYTE6, BYTE number 6, represents a reserved BYTE;
BYTEs 7-39 BYTE 7-39 represent display terminal command BYTEs: the protocol data is used for transmitting the protocol data of the display terminal, and the rest bytes of the area are filled by certain fixed bytes except the valid data;
BYTE40, BYTE number 40, represents the check BYTE: is the sum of the 1 st byte and the 39 th byte; if the checksum is not correct, the OPS audio/video converter returns an instruction command to the upper computer, and when the upper computer receives the instruction command, the upper computer obtains the conclusion that the frame data sent by the upper computer does not meet the protocol, and the frame data needs to be sent again.
Preferably, in step 2, the 1 st serial port and the 2 nd serial port of the microprocessor work in the following modes:
when a 1 st serial port receives a data packet from an upper computer, firstly judging whether the 1 st byte is a specific frame header byte or not, if not, discarding the rest data, not processing the rest data, and waiting for receiving the data again; if yes, judging whether the address byte is 0-31, if not, exceeding the address setting range, discarding the data packet, and waiting for receiving the data again; if yes, the following data packet is continuously received until 40 bytes are received, and whether the checksum is met is judged. If the checksum is met and the SDI signal is locked, writing the data packet into a register, and embedding the data packet in the register into the SDI audio/video signal by the SDI coding chip; if the data does not meet the check sum, the 1 st serial port sends check sum error indication frame data;
therefore, the microprocessor only receives a complete data packet which is sent by the upper computer and accords with the protocol standard, and executes the operation sent to the OPS audio/video converter, otherwise, only processes the parallel audio/video data signal;
and the 2 nd serial port continuously waits for receiving frame data returned by the display terminal, does not perform any processing, and sends the frame data to the upper computer for analysis through the 1 st serial port.
Preferably, in step 6, the operation 1 and the operation 2 executed by the single chip microcomputer are specifically:
after the single chip microcomputer is powered on or reset and restarted, initializing, continuously reading a register by the single chip microcomputer after the initialization is finished, judging whether an SDI signal is locked, and simultaneously checking whether a control command data packet is embedded; if the embedded control command data packet exists, judging whether the frame header and the check sum of the control command data packet are correct or not, and if not, discarding; if the BYTE is correct, judging whether the address BYTE is consistent with the address of the equipment, if not, discarding, if so, judging that the BYTE4 displays the terminal model BYTE, if 0xF0, opening an optical port, returning the received data to an upper computer through an optical fiber, and simultaneously closing the optical port; if the BYTE4 is not 0xF0, reading a display terminal command BYTE in frame data, sending the display terminal command BYTE to a corresponding display terminal through a serial port, opening an optical port, entering a link of waiting for receiving a display terminal return command, waiting for the time, if the serial port receives return data, packaging the data according to a frame format, and returning the data to an upper computer upwards through an optical fiber; and if no data is returned, closing the optical port.
The method for realizing single-fiber bidirectional transmission between the play controller and the display terminal has the following advantages that:
the SDI single-fiber bidirectional transmission system realizes bidirectional remote transmission of high-speed video signals and low-speed serial port control signals, and simultaneously realizes the functions of audio and video signal transmission, remote control of a display terminal and state query by using one optical fiber; the method has the advantages of simple wiring, easy installation and deployment, low cost and the like.
Drawings
Fig. 1 is an overall schematic diagram of a method for implementing single-fiber bidirectional transmission between a play controller and a display terminal according to the present invention;
FIG. 2 is a communication flow chart of the LCD display controller according to the present invention;
fig. 3 is a communication flow chart of the OPS audio/video converter terminal provided by the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a method for realizing single-fiber bidirectional transmission between a play controller and a display terminal, which is applied to a single-fiber bidirectional transmission system, and referring to fig. 1, the single-fiber bidirectional transmission system comprises an LCD play controller, a passive optical splitter, an OPS audio/video converter and a display terminal;
the LCD player controller is provided with a plurality of optical interfaces, and each optical interface is IN bidirectional connection with an input end IN interface of the passive optical splitter through a single-core bidirectional optical fiber; the passive optical splitter is provided with a plurality of output end OUT interfaces, and each output end OUT interface of the passive optical splitter is IN bidirectional connection with an input end IN interface of the OPS audio/video converter through a single-core bidirectional optical fiber; the OPS audio and video converter is provided with an OPS interface, wherein the OPS interface comprises a power interface, an audio and video interface and a UART communication interface; the OPS interface of the OPS audio-video converter is bidirectionally connected with the OPS interface of the display terminal;
the LCD playing controller comprises an upper computer and a video output module; the video output module comprises a microprocessor, an SDI coding chip and a plurality of optical modules; the 1 st interface of the upper computer is connected with the input end of the SDI coding chip; the 2 nd interface of the upper computer is bidirectionally connected with the 1 st serial port of the microprocessor; the 2 nd serial port of the microprocessor is bidirectionally connected with one end of each optical module; the microprocessor is bidirectionally connected with the SDI coding chip;
the OPS audio/video converter comprises a photoelectric conversion module, an electro-optical conversion module, a decoding circuit, a register, an HDMI coding chip and a single chip microcomputer;
the method for realizing single-fiber bidirectional transmission between the play controller and the display terminal comprises the following steps:
step 1, an upper computer outputs parallel video data, synchronous clock signals and audio data to an SDI coding chip through a parallel data output interface;
the upper computer generates a control command data packet for the appointed display terminal according to a frame format and sends the control command data packet to a No. 1 serial port of the microprocessor; the control command data packet carries a display terminal ID of a designated display terminal;
step 2, after the 1 st serial port of the microprocessor is powered on or reset and restarted, the initialization is firstly started, and the 1 st serial port and the 2 nd serial port continuously wait for receiving data;
when a 1 st serial port receives a control command data packet from an upper computer, firstly verifying the integrity and the validity of the control command data packet, if the verification fails, discarding the control command data packet, and reentering a data receiving waiting state; if the verification is passed, the control command data packet is sent to an SDI coding chip;
step 3, the SDI coding chip codes the parallel video data, the synchronous clock signals and the audio data sent by the upper computer into SDI audio and video signals, and embeds the control command data packet sent by the microprocessor into the SDI audio and video signals to obtain coded SDI signals; then sending the data to an optical module of a corresponding link;
step 4, the optical module performs electro-optical conversion on the coded SDI signal to convert the coded SDI signal into an optical SDI signal, and then transmits the optical SDI signal to a passive optical splitter through a single-core bidirectional optical fiber;
step 5, the passive optical splitter divides the received optical SDI signal into a plurality of branches, and each branch transmits the optical SDI signal to an OPS audio-video converter connected with the other end through a single-core bidirectional optical fiber;
step 6, after receiving the optical SDI signal, the OPS audio/video converter converts the optical SDI signal into an SDI electrical signal through a photoelectric conversion module, then a decoding circuit decodes the SDI electrical signal to obtain decoded original audio/video data, wherein the original audio/video data comprises parallel video data, a synchronous clock signal and audio data, and sends the original audio/video data to an HDMI coding chip; meanwhile, the decoding circuit generates an SDI locking signal for indicating that the original audio and video data is valid; in addition, if the SDI electric signal is embedded with a control command data packet, the decoding circuit also decodes the control command data packet at the same time; then, storing the decoded control command data packet into a register;
after the single chip microcomputer of the OPS audio/video converter is powered on or reset and restarted, initializing, continuously reading a register by the single chip microcomputer after the initialization is completed, and executing the following operations 1 and 2 in parallel:
operation 1: the single chip microcomputer judges whether an SDI locking signal exists or not, and if not, the SDI locking pin value is continuously read; if the SDI locking signal exists, configuring an HDMI coding chip, coding the parallel video data, the synchronous clock signal and the audio data by the HDMI coding chip to obtain HDMI audio and video streams, and outputting the HDMI audio and video streams to a display terminal to enable the display terminal to display the HDMI audio and video streams;
operation 2: the single chip microcomputer judges whether a control command data packet is obtained after decoding, and if not, the single chip microcomputer indicates that the optical SDI signal received by the OPS audio-video converter is only parallel audio-video data needing to be displayed; if yes, the single chip microcomputer checks the control command data packet, and if the check is incorrect, the control command data packet is discarded; if the verification is correct, further judging whether the display terminal ID carried in the control command data packet is the display terminal corresponding to the OPS audio/video converter, and if not, discarding the control command data packet; if yes, judging whether the control command data packet is a test command, if yes, executing step 7; if not, executing step 8;
step 7, the singlechip sends the control command data packet to an electro-optical conversion module, converts the control command data packet into an optical SDI signal, opens an optical port of the OPS audio-video converter, and sends the optical SDI signal to a passive optical splitter through a single-core bidirectional optical fiber; then, the singlechip closes the optical port;
the passive optical splitter sends the optical SDI signal to the LCD play controller;
the LCD playing controller receives an optical SDI signal returned by the OPS audio-video converter at a set time, and the optical SDI signal represents that the physical link communication from the LCD playing controller to the OPS audio-video converter is normal; otherwise, representing the communication fault of the physical link from the LCD playing controller to the OPS audio/video converter;
step 8, the singlechip analyzes the control command data packet, obtains the display terminal ID and the control command data which need to be controlled, opens an optical port, then sends the control command data to the corresponding display terminal to further control the display terminal, and then the singlechip enters a link of waiting for receiving a response message of the display terminal; when the waiting time is up, if the singlechip does not receive the response message returned by the display terminal, the singlechip closes the optical port;
if the single chip receives a response message returned by the display terminal, executing the step 9;
step 9, the single chip microcomputer packs the response message according to a frame format, converts the response message into an optical serial port signal through an electro-optical conversion module, and then sends the optical serial port signal to a passive optical splitter through a single-core bidirectional optical fiber; then, the passive optical splitter sends the optical serial port signal to the LCD playing controller, and the function that the display terminal returns to the state of the LCD playing controller is achieved.
One specific embodiment is described below:
1. an upper computer in the LCD playing controller sends a control command data packet to a microprocessor of the video output module, the microprocessor communicates through a serial port, the interface parameters are a baud rate of 38400bps, no check exists, the data bit is 8 bits, and the stop bit is 1 bit.
The control command data packet adopts the following specific frame structure:
the frame structure of the control command data packet comprises 40 bytes in total;
the 1 st BYTE1 is a frame header, and the frame headers of all control command data packets are the same, so that if an error frame header is used, the whole control command data packet cannot be received by the OPS audio/video converter, and further, the error sending of an upper computer is prevented; the header adopts 0/1 non-adjacent bytes, such as 0xAA, etc., which can greatly reduce the error rate in the low-speed data transmission of the optical fiber. (ii) a
BYTE2, BYTE2, is the display terminal ID: specifically, the display terminal ID is a display terminal ADDRESS, which is not an ID number set inside the display terminal in a general sense, but an ADDRESS set through a 5-bit dial switch on an OPS audio/video converter embedded in the display terminal; the display terminal does not need to be specially set. Because the OPS audio-video converters correspond to the display terminals one by one, the address of the OPS audio-video converters uniquely identifies the corresponding display terminals; in addition, 32 different addresses of 0 to 31 can be set. And the number of display terminals connected with the play controller in a subway station is generally not more than 32.
BYTE3, BYTE3, is a retransmit flag: wherein 0x00 represents an entirely new command; 0x01 indicates that the same command is retransmitted for the 1 st time; 0x02 indicates that the same command is retransmitted a second time, and so on; if the same command needs to be retransmitted once, the retransmission mark needs to be modified, and the OPS audio/video converter can respond;
BYTE4, BYTE4, is the display terminal model;
wherein, 0xF0 is used to detect whether the physical link is normally connected, that is: after the system is connected, the upper computer sends a test command to each OPS audio/video converter, the OPS audio/video converters return response data fixed by the upper computer after receiving the test command, and after the upper computer receives and verifies the response data, the upper computer obtains the conclusion that the whole signal link is normally connected and the address of the OPS audio/video converters is correctly set, so that the OPS audio/video converters and the upper computer can normally communicate;
0xA _, 0xB _, 0xC _, 0xD _, 0xE _, and so on, representing the display terminal model of a specific brand;
for example:
0xA _: wherein A represents the display of LG brand, the lower 4 bits represent the specific model of LG display, and the specific numerical value is determined by the model.
0xB _: wherein B represents the NEC brand display, the lower 4 bits represent the specific model of the NEC display, and the specific numerical value is determined by the model.
0xC _: wherein C represents the Philips brand display, the lower 4 bits represent the specific model of the Philips display, and the specific numerical value is determined by the model.
0xD _: wherein D represents the loose brand display, the lower 4 bits represent the specific model of the loose display, and the specific numerical value is determined by the model.
0xE _: wherein E represents the display of the Beijing-east brand, the lower 4 bits represent the specific model of the Beijing-east display, and the specific numerical value is determined by the model.
0x9 _: wherein 9 represents the XX brand display, the lower 4 bits represent the specific model of the XX display, and the specific numerical value is determined by the model.
(8)0x8 _: wherein 8 represents the display of the creative brand, the lower 4 bits represent the specific model of the XX display, and the specific numerical value is determined by the model.
And so on.
BYTE5, BYTE5, represents the display terminal command BYTE length: the system can be compatible with various brand display terminals, the control commands of different brand display terminals have larger difference, and even if the display terminals of the same brand are used, the byte numbers of different control commands can be different. The BYTE5 BYTE in the frame format is used to indicate the number of BYTEs commanded by the display terminal, i.e.: the device comprises a display terminal command area, an OPS audio/video converter, a display terminal command area and a display terminal control area, wherein the display terminal command area is used for transmitting the number of bytes actually occupied by the display terminal command in 33 bytes of the display terminal command area, and the bytes are used for extracting the display terminal command by the OPS audio/video converter; BYTE5 fixes bits 0x21 when BYTE4 is 0xF 0;
BYTE6, BYTE number 6, represents a reserved BYTE; which is not used for the moment, can be set to some fixed byte, such as 0x 00.
BYTEs 7-39 BYTE 7-39 represent display terminal command BYTEs: for transmitting protocol data of the display terminal, the remaining bytes except the valid data are filled with some fixed byte, such as 0x 55.
BYTE40, BYTE number 40, represents the check BYTE: is the sum of the 1 st byte and the 39 th byte; if the checksum is not correct, the OPS audio-video converter returns an instruction command of 40 same specific bytes, such as 0xF0 of 40 bytes, to the upper computer, and when the upper computer receives the instruction command, the upper computer obtains a conclusion that the frame data sent by the upper computer does not meet the protocol, and the frame data needs to be sent again.
2. The upper computer is the center of the whole system and is responsible for scheduling the communication of the whole system. The upper computer actively sends the data in the frame format, and the OPS audio/video converter does not actively send a data packet to the upper computer and only responds to an instruction sent by the upper computer.
3. The upper computer is responsible for specific analysis of the data returned by the display terminal.
4. Microprocessor communication flow
Referring to fig. 2, the 1 st serial port and the 2 nd serial port of the microprocessor operate in the following manner:
after the microprocessor is powered on or reset and restarted, initialization is firstly carried out, wherein the initialization comprises interrupt initialization, SDI coding chip GS2972 initialization, serial port initialization, optical module initialization and the like. After the initialization is completed, the No. 1 serial port and the No. 2 serial port continuously wait for receiving data. When a 1 st serial port receives a data packet from an upper computer, firstly judging whether the 1 st byte is a specific frame header byte or not, if not, discarding the rest data, not processing the rest data, and waiting for receiving the data again; if yes, judging whether the address byte is 0-31, if not, exceeding the address setting range, discarding the data packet, and waiting for receiving the data again; if yes, the following data packet is continuously received until 40 bytes are received, and whether the checksum is met is judged. If the checksum is met and the SDI signal is locked, writing the data packet into a register, and embedding the data packet in the register into the SDI audio/video signal by the SDI coding chip; if the data does not meet the check sum, the 1 st serial port sends check sum error indication frame data;
therefore, the microprocessor only receives a complete data packet which is sent by the upper computer and accords with the protocol standard, and executes the operation sent to the OPS audio/video converter, otherwise, only processes the parallel audio/video data signal;
and the 2 nd serial port continuously waits for receiving frame data returned by the display terminal, does not perform any processing, and sends the frame data to the upper computer for analysis through the 1 st serial port.
Communication process of OPS audio/video converter
Referring to fig. 3, the operations 1 and 2 executed by the single chip microcomputer are specifically:
after the single chip microcomputer is powered on or reset and restarted, initialization is firstly carried out, wherein the initialization comprises interrupt initialization, SDI coding chip GS2971 initialization, serial port initialization, optical module initialization and the like. After initialization is completed, the single chip microcomputer continuously reads the register, judges whether the SDI signal is locked or not, and simultaneously checks whether a control command data packet is embedded or not; if the embedded control command data packet exists, judging whether the frame header and the check sum of the control command data packet are correct or not, and if not, discarding; if the BYTE is correct, judging whether the address BYTE is consistent with the address of the equipment, if not, discarding, if so, judging that the BYTE4 displays the terminal model BYTE, if 0xF0, opening an optical port, returning the received data to an upper computer through an optical fiber, and simultaneously closing the optical port; if the BYTE4 is not 0xF0, reading a display terminal command BYTE in frame data, sending the display terminal command BYTE to a corresponding display terminal through a serial port, opening an optical port, entering a link of waiting for receiving a display terminal return command, waiting for the time, if the serial port receives return data, packaging the data according to a frame format, and returning the data to an upper computer upwards through an optical fiber; and if no data is returned, closing the optical port.
In the invention, because 2 groups of one-to-eight passive optical splitters exist, when all OPS audio and video converters return information to the upper computer, channels of the passive optical splitters need to be multiplexed in a time-sharing mode, in order to prevent mutual interference of the transmitting power of optical modules on each terminal, when the OPS audio and video converters do not receive a command transmitted to the address, optical ports of the OPS audio and video converters are kept in a closed state, and the OPS audio and video converters can be opened when data are required to be transmitted to the upper computer.
Therefore, according to the method for realizing single-fiber bidirectional transmission between the play controller and the display terminal, the whole link is based on an optical SDI signal, a single-fiber bidirectional optical fiber is used as a transmission medium, the video play controller transmits audio and video signals in a high-speed optical SDI format and state control and query commands downwards at 1550nm wavelength, the audio and video signals and the state control and query commands are expanded into multiple paths through a passive optical splitter and are respectively sent to all OPS audio and video converters (embedded into the display terminal), the OPS audio and video converters analyze and convert the optical SDI format audio and video signals and the state control query commands into TMDS streams and serial port signals, and the TMDS streams and the serial port signals are sent to the display terminal through an OPS interface to finish.
And after receiving the control inquiry command, the display terminal executes corresponding action and simultaneously feeds back the confirmation signal and the state signal upwards. And after receiving the data sent by the display terminal, the OPS audio/video converter packages the data according to a communication protocol frame format and sends a low-speed optical serial port signal upwards at a wavelength of 1330 nm. The display controller can drive a plurality of display terminals, needs to be subjected to passive light splitting, and adopts time-sharing to receive serial port light signals in order to avoid mutual interference when receiving the serial port signals, and the optical port of the OPS audio/video converter can only be opened when sending data.
The method for realizing single-fiber bidirectional transmission between the play controller and the display terminal has the following advantages that:
1) the SDI single-fiber bidirectional transmission system realizes bidirectional remote transmission of high-speed video signals and low-speed serial port control signals, and simultaneously realizes the functions of audio and video signal transmission, remote control of a display terminal and state query by using one optical fiber; the method has the advantages of simple wiring, easy installation and deployment, low cost and the like.
2) The video transmission system has the advantages that the equipment structure of the video transmission system is simplified, the high integration of remote display and remote control is realized, the power consumption is reduced, the difficulty and the cost of system installation and maintenance are reduced, and the system stability and the operation efficiency are improved;
3) the method can realize the control and state query of a plurality of display terminals, is compatible with a plurality of display terminals, can realize all instructions opened by the display terminals, and has simple and reliable algorithm.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements should also be considered within the scope of the present invention.
Claims (4)
1. A method for realizing single-fiber bidirectional transmission between a play controller and a display terminal is characterized in that the method is applied to a single-fiber bidirectional transmission system, and the single-fiber bidirectional transmission system comprises an LCD play controller, a passive optical splitter, an OPS audio/video converter and the display terminal;
the LCD player controller is provided with a plurality of optical interfaces, and each optical interface is IN bidirectional connection with an input end IN interface of the passive optical splitter through a single-core bidirectional optical fiber; the passive optical splitter is provided with a plurality of output end OUT interfaces, and each output end OUT interface of the passive optical splitter is IN bidirectional connection with an input end IN interface of the OPS audio/video converter through a single-core bidirectional optical fiber; the OPS audio/video converter is provided with an OPS interface; the OPS interface comprises a power interface, an audio and video interface and a UART communication interface; the OPS interface of the OPS audio-video converter is bidirectionally connected with the OPS interface of the display terminal;
the LCD playing controller comprises an upper computer and a video output module; the video output module comprises a microprocessor, an SDI coding chip and a plurality of optical modules; the 1 st interface of the upper computer is connected with the input end of the SDI coding chip; the 2 nd interface of the upper computer is bidirectionally connected with the 1 st serial port of the microprocessor; the 2 nd serial port of the microprocessor is bidirectionally connected with one end of each optical module; the microprocessor is bidirectionally connected with the SDI coding chip;
the OPS audio/video converter comprises a photoelectric conversion module, an electro-optical conversion module, a decoding circuit, a register, an HDMI coding chip and a single chip microcomputer;
the method for realizing single-fiber bidirectional transmission between the play controller and the display terminal comprises the following steps:
step 1, an upper computer outputs parallel video data, synchronous clock signals and audio data to an SDI coding chip through a parallel data output interface;
the upper computer generates a control command data packet for the appointed display terminal according to a frame format and sends the control command data packet to a No. 1 serial port of the microprocessor; the control command data packet carries a display terminal ID of a designated display terminal;
step 2, after the 1 st serial port of the microprocessor is powered on or reset and restarted, the initialization is firstly started, and the 1 st serial port and the 2 nd serial port continuously wait for receiving data;
when a 1 st serial port receives a control command data packet from an upper computer, firstly verifying the integrity and the validity of the control command data packet, if the verification fails, discarding the control command data packet, and reentering a data receiving waiting state; if the verification is passed, the control command data packet is sent to an SDI coding chip;
step 3, the SDI coding chip codes the parallel video data, the synchronous clock signals and the audio data sent by the upper computer into SDI audio and video signals, and embeds the control command data packet sent by the microprocessor into the SDI audio and video signals to obtain coded SDI signals; then sending the data to an optical module of a corresponding link;
step 4, the optical module performs electro-optical conversion on the coded SDI signal to convert the coded SDI signal into an optical SDI signal, and then transmits the optical SDI signal to a passive optical splitter through a single-core bidirectional optical fiber;
step 5, the passive optical splitter divides the received optical SDI signal into a plurality of branches, and each branch transmits the optical SDI signal to an OPS audio-video converter connected with the other end through a single-core bidirectional optical fiber;
step 6, after receiving the optical SDI signal, the OPS audio/video converter converts the optical SDI signal into an SDI electrical signal through a photoelectric conversion module, then a decoding circuit decodes the SDI electrical signal to obtain decoded original audio/video data, wherein the original audio/video data comprises parallel video data, a synchronous clock signal and audio data, and sends the original audio/video data to an HDMI coding chip; meanwhile, the decoding circuit generates an SDI locking signal for indicating that the original audio and video data is valid; in addition, if the SDI electric signal is embedded with a control command data packet, the decoding circuit also decodes the control command data packet at the same time; then, storing the decoded control command data packet into a register;
after the single chip microcomputer of the OPS audio/video converter is powered on or reset and restarted, initializing, after the initialization is completed, continuously reading a register by the single chip microcomputer, and executing the following operations 1 and 2:
operation 1: the single chip microcomputer judges whether an SDI locking signal exists or not, and if not, the SDI locking pin value is continuously read; if the SDI locking signal exists, configuring an HDMI coding chip, coding the parallel video data, the synchronous clock signal and the audio data by the HDMI coding chip to obtain HDMI audio and video streams, and outputting the HDMI audio and video streams to a display terminal to enable the display terminal to display the HDMI audio and video streams;
operation 2: the single chip microcomputer judges whether a control command data packet is obtained after decoding, and if not, the single chip microcomputer indicates that the optical SDI signal received by the OPS audio-video converter is only parallel audio-video data needing to be displayed; if yes, the single chip microcomputer checks the control command data packet, and if the check is incorrect, the control command data packet is discarded; if the verification is correct, further judging whether the display terminal ID carried in the control command data packet is the display terminal corresponding to the OPS audio/video converter, and if not, discarding the control command data packet; if yes, judging whether the control command data packet is a test command, if yes, executing step 7; if not, executing step 8;
step 7, the singlechip sends the control command data packet to an electro-optical conversion module, converts the control command data packet into an optical SDI signal, opens an optical port of the OPS audio-video converter, and sends the optical SDI signal to a passive optical splitter through a single-core bidirectional optical fiber; then, the singlechip closes the optical port;
the passive optical splitter sends the optical SDI signal to the LCD play controller;
the LCD playing controller receives an optical SDI signal returned by the OPS audio-video converter at a set time, and the optical SDI signal represents that the physical link communication from the LCD playing controller to the OPS audio-video converter is normal; otherwise, representing the communication fault of the physical link from the LCD playing controller to the OPS audio/video converter;
step 8, the singlechip analyzes the control command data packet, obtains the display terminal ID and the control command data which need to be controlled, opens an optical port, then sends the control command data to the corresponding display terminal to further control the display terminal, and then the singlechip enters a link of waiting for receiving a response message of the display terminal; when the waiting time is up, if the singlechip does not receive the response message returned by the display terminal, the singlechip closes the optical port;
if the single chip receives a response message returned by the display terminal, executing the step 9;
step 9, the single chip microcomputer packs the response message according to a frame format, converts the response message into an optical serial port signal through an electro-optical conversion module, and then sends the optical serial port signal to a passive optical splitter through a single-core bidirectional optical fiber; then, the passive optical splitter sends the optical serial port signal to the LCD playing controller, and the function that the display terminal returns to the state of the LCD playing controller is achieved.
2. The method as claimed in claim 1, wherein in step 1, the upper computer generates a control command packet for the specified display terminal according to a frame format, and the frame structure of the control command packet is as follows:
the frame structure of the control command data packet comprises 40 bytes in total;
the 1 st BYTE1 is a frame header, and the frame headers of all control command data packets are the same, so that if an error frame header is used, the whole control command data packet cannot be received by the OPS audio/video converter, and further, the error sending of an upper computer is prevented; the header uses 0/1 non-adjacent bytes;
BYTE2, BYTE2, is the display terminal ID: specifically, the display terminal ID is a display terminal ADDRESS, which is an ADDRESS set by a 5-bit dial switch on an OPS audio/video converter embedded in the display terminal; because the OPS audio-video converters correspond to the display terminals one by one, the address of the OPS audio-video converters uniquely identifies the corresponding display terminals;
BYTE3, BYTE3, is a retransmit flag: wherein 0x00 represents an entirely new command; 0x01 indicates that the same command is retransmitted for the 1 st time; 0x02 indicates that the same command is retransmitted a second time, and so on; if the same command needs to be retransmitted once, the retransmission mark needs to be modified, and the OPS audio/video converter can respond;
BYTE4, BYTE4, is the display terminal model; wherein, 0xF0 is used to detect whether the physical link is normally connected, that is: after the system is connected, the upper computer sends a test command to each OPS audio/video converter, the OPS audio/video converters return response data fixed by the upper computer after receiving the test command, and after the upper computer receives and verifies the response data, the upper computer obtains the conclusion that the whole signal link is normally connected and the address of the OPS audio/video converters is correctly set, so that the OPS audio/video converters and the upper computer can normally communicate;
0xA _, 0xB _, 0xC _, 0xD _, 0xE _, and so on, representing the display terminal model of a specific brand;
BYTE5, BYTE5, represents the display terminal command BYTE length: the system can be compatible with various brand display terminals, the control commands of different brand display terminals have larger difference, and even if the display terminals of the same brand are used, the byte numbers of different control commands can be different. The BYTE5 BYTE in the frame format is used to indicate the number of BYTEs commanded by the display terminal, i.e.: the device comprises a display terminal command area, an OPS audio/video converter, a display terminal command area and a display terminal control area, wherein the display terminal command area is used for transmitting the number of bytes actually occupied by the display terminal command in 33 bytes of the display terminal command area, and the bytes are used for extracting the display terminal command by the OPS audio/video converter; BYTE5 fixes bits 0x21 when BYTE4 is 0xF 0;
BYTE6, BYTE number 6, represents a reserved BYTE;
BYTEs 7-39 BYTE 7-39 represent display terminal command BYTEs: the protocol data is used for transmitting the protocol data of the display terminal, and the rest bytes of the area are filled by certain fixed bytes except the valid data;
BYTE40, BYTE number 40, represents the check BYTE: is the sum of the 1 st byte and the 39 th byte; if the checksum is not correct, the OPS audio/video converter returns an instruction command to the upper computer, and when the upper computer receives the instruction command, the upper computer obtains the conclusion that the frame data sent by the upper computer does not meet the protocol, and the frame data needs to be sent again.
3. The method for realizing the single-fiber bidirectional transmission between the play controller and the display terminal as claimed in claim 2, wherein in the step 2, the 1 st serial port and the 2 nd serial port of the microprocessor work in the following way:
when a 1 st serial port receives a data packet from an upper computer, firstly judging whether the 1 st byte is a specific frame header byte or not, if not, discarding the rest data, not processing the rest data, and waiting for receiving the data again; if yes, judging whether the address byte is 0-31, if not, exceeding the address setting range, discarding the data packet, and waiting for receiving the data again; if yes, the following data packet is continuously received until 40 bytes are received, and whether the checksum is met is judged. If the checksum is met and the SDI signal is locked, writing the data packet into a register, and embedding the data packet in the register into the SDI audio/video signal by the SDI coding chip; if the data does not meet the check sum, the 1 st serial port sends check sum error indication frame data;
therefore, the microprocessor only receives a complete data packet which is sent by the upper computer and accords with the protocol standard, and executes the operation sent to the OPS audio/video converter, otherwise, only processes the parallel audio/video data signal;
and the 2 nd serial port continuously waits for receiving frame data returned by the display terminal, does not perform any processing, and sends the frame data to the upper computer for analysis through the 1 st serial port.
4. The method according to claim 2, wherein in step 6, the operation 1 and the operation 2 executed by the single chip are specifically:
after the single chip microcomputer is powered on or reset and restarted, initializing, continuously reading a register by the single chip microcomputer after the initialization is finished, judging whether an SDI signal is locked, and simultaneously checking whether a control command data packet is embedded; if the embedded control command data packet exists, judging whether the frame header and the check sum of the control command data packet are correct or not, and if not, discarding; if the BYTE is correct, judging whether the address BYTE is consistent with the address of the equipment, if not, discarding, if so, judging that the BYTE4 displays the terminal model BYTE, if 0xF0, opening an optical port, returning the received data to an upper computer through an optical fiber, and simultaneously closing the optical port; if the BYTE4 is not 0xF0, reading a display terminal command BYTE in frame data, sending the display terminal command BYTE to a corresponding display terminal through a serial port, opening an optical port, entering a link of waiting for receiving a display terminal return command, waiting for the time, if the serial port receives return data, packaging the data according to a frame format, and returning the data to an upper computer upwards through an optical fiber; and if no data is returned, closing the optical port.
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