CN106982199B - Manchester code communication protocol self-adaption method based on FPGA and CPLD - Google Patents
Manchester code communication protocol self-adaption method based on FPGA and CPLD Download PDFInfo
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- CN106982199B CN106982199B CN201610298665.4A CN201610298665A CN106982199B CN 106982199 B CN106982199 B CN 106982199B CN 201610298665 A CN201610298665 A CN 201610298665A CN 106982199 B CN106982199 B CN 106982199B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
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- H—ELECTRICITY
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- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
- H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
- H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
- H04L69/324—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the data link layer [OSI layer 2], e.g. HDLC
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Abstract
The invention relates to a Manchester code communication protocol self-adaption method based on FPGA and CPLD, which comprises the following steps: and presetting data receiving, decoding, encoding and transmitting modules of different Manchester code communication protocols. The self-adaptive method of the Manchester code communication protocol based on the FPGA/CPLD automatically identifies the frame format of input data, reads the data content and selects the matched frame format of output data. Different communication protocols adopted by different systems can be realized by the same FPGA/CPLD same code, and a self-adaptive data link layer protocol component with a universal interface and easily expanded functions is completed, so that the communication requirements under various industrial control system conditions can be better met.
Description
Technical Field
The invention provides a Manchester code communication protocol self-adaption method based on an FPGA and a CPLD, and belongs to the field of industrial control automation communication.
Background
Compared with binary codes, the Manchester code has the following advantages: jumping is carried out in the middle of each bit code element in the waveform, so that a receiving end can extract a clock signal conveniently; no direct current component can reduce the power consumption of the system during transmission; the Manchester code transmission mode is very suitable for fast switching of multi-path data. Manchester codes are widely used in many fields, such as telecommunications, industrial control, vehicle buses, oil exploration wells, and the like.
Chinese patent CN105187070A discloses a manchester encoded signal decoding method, which comprises: receiving a Manchester coded signal; determining a sampling period according to the theoretical head level duration of the Manchester coded signal, uniformly setting a plurality of sampling points with the same number in the front sampling period and the rear sampling period of each code element, and acquiring a high level and a low level corresponding to each sampling point; correcting the Manchester coded signal according to the number of high level sampling points in the front sampling period and the rear sampling period of the code element; the modified data signal is decoded according to the manchester encoding rules. The invention can only identify a single Manchester code communication protocol, and has no universality and compatibility in the current complex and diversified industrial control systems.
Chinese patent CN103888143A discloses a manchester code receiving circuit, which includes: an analog circuit configured to convert an analog signal received through the communication transmission path into a digital signal based on a manchester code; and a characteristic compensation unit configured to compensate at least one of a rising delay characteristic in which a rising time of the digital signal is greater than a falling time and a falling delay characteristic in which a falling time of the digital signal is greater than a rising time. The circuit of the invention comprises an analog circuit and a digital circuit, the integrity of signals is unreliable, and the circuit is complicated.
Disclosure of Invention
In order to solve the above problems, the present invention provides a manchester code communication protocol adaptive method based on FPGA and CPLD, comprising:
the method comprises the steps that data receiving, decoding, encoding and transmitting modules of different Manchester code communication protocols are preset, the receiving and decoding modules are used for receiving data from a data link layer and analyzing the data into address codes and data codes, and the encoding and transmitting modules are used for compiling the address codes and the data codes into data frames of different formats and transmitting the data frames out of the data link layer.
The data frame format identification and adaptation module extracts the address code and the data code of the current effective data frame format and transmits the address code and the data code to the application layer, and simultaneously defines the formats of the address code and the data code for the data transmitted to the data link layer by the application layer.
The self-adaptive method of the Manchester code communication protocol based on the FPGA/CPLD automatically identifies the frame format of input data, reads the data content and selects the matched frame format of output data. Different communication protocols adopted by different systems can be realized by the same FPGA/CPLD same code, and a self-adaptive data link layer protocol component with a universal interface and easily expanded functions is completed, so that the communication requirements under various industrial control system conditions can be better met.
Drawings
Fig. 1 shows a method for decoding a manchester code signal in the prior art.
FIG. 2 is a block diagram of a Manchester code communication protocol adaptation method based on FPGA/CPLD according to the present invention.
Detailed Description
The invention discloses a self-adaptive method of a Manchester code communication protocol based on an FPGA/CPLD, which comprises the following steps: the method comprises the steps that data receiving, decoding, encoding and transmitting modules of different Manchester code communication protocols are preset, the receiving and decoding modules are used for receiving data from a data link layer and analyzing the data into address codes and data codes, and the encoding and transmitting modules are used for compiling the address codes and the data codes into data frames of different formats and transmitting the data frames out of the data link layer.
A communication protocol identification and processing method which takes programmable logic devices such as FPGA, CPLD and the like as carriers and takes Manchester codes as encoding rules; the data received from the port is analyzed into an address code, a data code and a data valid bit mark through a receiving and decoding module; the data frame format identification and adaptation module transmits the data content to a corresponding register according to the data valid bit and the address code, and sends an enabling signal to the decoding and sending module; the application layer receives the data from the data frame identification and adaptation module, and allocates an address code to the data to be output and transmits the data to the coding and sending module; and finally, selecting a coding and transmitting module matched with the format of the received data frame according to the enabling bit to transmit signals.
The self-adaptive method for the Manchester code communication protocol based on the FPGA and the CPLD comprises the steps that a plurality of receiving and decoding modules are preset, all the receiving and decoding modules count the length of each frame of data, effective bit marks are output when the length of each data frame is matched with the length setting arranged in the receiving and decoding modules, each module processes a signal in a data frame format, namely the Manchester code communication protocol, the number of the receiving and decoding modules is determined according to the number of protocols which are required to be compatible, and the receiving and encoding modules output address codes, data codes and effective flag bits.
According to the self-adaptive method of the Manchester code communication protocol based on the FPGA and the CPLD, the data frame format identification and adaptation module receives output signals of all receiving and decoding modules, only one communication protocol is arranged under a pair of communication devices, only one of the corresponding receiving and decoding modules works effectively and can give a valid bit mark, the data frame format identification and adaptation module selects one receiving and decoding module to output according to the valid bit mark, the output of other receiving and decoding modules is filtered, and the application layer reads data contents from the data frame format identification and adaptation module.
The self-adaptive method of the Manchester code communication protocol based on the FPGA and the CPLD is characterized in that a plurality of coding and transmitting modules are preset corresponding to the receiving and decoding modules, each data frame format is provided with a unique receiving and decoding module and a coding and transmitting module, an application layer transmits data to be output to all the coding and transmitting modules, and only one coding and transmitting module outputs the data to be output from a transmitting port according to a transmitting enabling bit.
As shown in fig. 2, the manchester code communication protocol adaptation method based on the FPGA and the CPLD includes the following steps (taking a data frame format n as an example):
the method comprises the following steps: the port receives Manchester code communication protocol data with a frame data frame format n, all receiving and decoding modules process the frame data, but only the receiving and decoding module capable of processing the frame format n can output a valid bit mark, and the receiving and decoding module (protocol n) outputs an address code, a data code and a valid bit (n) mark;
step two:
3) the data frame format identification and adaptation module selects an address code with a valid bit (n) mark and a data code (n) to be processed and then transmits the processed data code to an application layer;
4) the data frame format identification and adaptation module outputs a sending enable bit (n);
step three: the application layer transmits the data to all the coding and sending modules; the enable bit (n) enables encoding, sending the output data of the module (protocol n) to the output port.
The self-adaptive method for the Manchester code communication protocol based on the FPGA and the CPLD supports all the Manchester code communication protocols based on the FPGA and the CPLD, and the communication protocols are different according to the different frame lengths of the Manchester code data.
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A Manchester code communication protocol self-adaption method based on FPGA and CPLD is characterized in that: presetting data receiving, decoding, encoding and transmitting modules of different Manchester code communication protocols, wherein:
the receiving and decoding module is used for receiving data from a data link layer and analyzing the data into an address code and a data code;
the coding and sending module is used for compiling the address codes and the data codes into data frames in different formats and sending the data frames out of a data link layer;
the data frame format identification and adaptation module is used for taking out an address code and a data code of a currently effective data frame format and transmitting the address code and the data code to an application layer, and simultaneously limiting the formats of the address code and the data code for data transmitted to a data link layer by the application layer;
the self-adaptive method for the Manchester code communication protocol based on the FPGA and the CPLD comprises the following steps: a communication protocol identification and processing method which takes FPGA and CPLD programmable logic devices as carriers and takes Manchester codes as encoding rules; the data received from the port is analyzed into an address code, a data code and a data valid bit mark through a receiving and decoding module; the data frame format identification and adaptation module transmits the data content to a corresponding register according to the data valid bit and the address code, and sends an enabling signal to the decoding and sending module; the application layer receives the data from the data frame identification and adaptation module, and allocates an address code to the data to be output and transmits the data to the coding and sending module; and finally, selecting a coding and transmitting module matched with the format of the received data frame according to the enabling bit to transmit signals.
2. The adaptive method for manchester code communication protocols based on the FPGA and the CPLD as claimed in claim 1, wherein a plurality of receiving and decoding modules are preset, all the receiving and decoding modules count the length of each frame of data, when the length of the data frame matches with the respective built-in length setting, a valid bit identifier is output, each receiving and decoding module processes a signal in a data frame format, i.e. a manchester code communication protocol, the number of the receiving and decoding modules is determined according to the number of protocols to be compatible, and the receiving and encoding modules output address codes, data codes and valid flag bits.
3. The manchester code communication protocol adaptation method based on FPGA and CPLD as claimed in claim 1, wherein the data frame format recognition and adaptation module receives output signals of all receiving and decoding modules, there is only one communication protocol under a pair of communication devices, only one of the corresponding receiving and decoding modules is active and can give an active bit flag, the data frame format recognition and adaptation module selects one of the receiving and decoding modules to output according to the active bit flag, and filters outputs of the other receiving and decoding modules, the application layer reads data content from the data frame format recognition and adaptation module.
4. The adaptive method for manchester code communication protocol based on FPGA and CPLD of claim 1, wherein a plurality of encoding and transmitting modules are preset corresponding to the receiving and decoding modules, each data frame format has a unique receiving and decoding module and an encoding and transmitting module, the application layer transmits data to be output to all the encoding and transmitting modules, and only one encoding and transmitting module outputs data to be transmitted from the transmitting port according to the transmitting enable bit.
5. The manchester code communication protocol adaptation method based on the FPGA and the CPLD of claim 1, comprising the steps of:
the method comprises the following steps: the port receives Manchester code communication protocol data with a frame data frame format n, all receiving and decoding modules process the frame data, but only the receiving and decoding module capable of processing the frame format n can output an effective bit mark, and the receiving and decoding module of the protocol n outputs an address code, a data code and an effective bit mark;
step two:
the data frame format identification and adaptation module selects an address code with a valid bit mark and a data code n to be processed and then transmits the processed data code n to an application layer;
the data frame format identification and adaptation module outputs a sending enable bit n;
step three: the application layer transmits the data to all the coding and sending modules; and transmitting the encoding of the enabling bit n enabling protocol n and the output data of the transmitting module to an output port.
6. The adaptive method for manchester code communication protocols based on FPGA and CPLD as claimed in claim 1, supporting all manchester code communication protocols based on FPGA and CPLD, wherein the communication protocols are different according to the frame length of manchester code data.
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| CN111934537B (en) * | 2020-08-21 | 2023-07-21 | 湖北师范大学 | Anti-interference method for driving signals of cascade converter |
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