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WO2018165900A1 - Procede de commande de communication et appareil de commande - Google Patents

Procede de commande de communication et appareil de commande Download PDF

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Publication number
WO2018165900A1
WO2018165900A1 PCT/CN2017/076760 CN2017076760W WO2018165900A1 WO 2018165900 A1 WO2018165900 A1 WO 2018165900A1 CN 2017076760 W CN2017076760 W CN 2017076760W WO 2018165900 A1 WO2018165900 A1 WO 2018165900A1
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WO
WIPO (PCT)
Prior art keywords
serial port
data
slave
virtual
node
Prior art date
Application number
PCT/CN2017/076760
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English (en)
Chinese (zh)
Inventor
黄健
景强
汪德暖
Original Assignee
深圳中兴力维技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳中兴力维技术有限公司 filed Critical 深圳中兴力维技术有限公司
Priority to PCT/CN2017/076760 priority Critical patent/WO2018165900A1/fr
Priority to CN201780002445.5A priority patent/CN108235802A/zh
Publication of WO2018165900A1 publication Critical patent/WO2018165900A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
    • G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a communication control method and a control device.
  • a host that manages data is connected to several slaves via RS485.
  • Each slave has several serial ports to connect with the front-end collection terminal to realize communication between the host and the front-end collection terminal.
  • an object of the present invention is to provide a communication control method and control apparatus, which are intended to effectively improve communication efficiency between a host and a slave serial port.
  • the present invention provides a communication control method for implementing communication between a host and each serial port of each slave.
  • the communication control method includes the following steps:
  • the creating a virtual serial port node corresponding to each of the serial ports of each of the slaves includes:
  • the step of performing addressing mapping on the virtual serial port node and the corresponding serial port includes: [0014] encoding a handle of the virtual serial port node and a corresponding address of the slave port And corresponding address encoding of the serial port, and mapping of the virtual serial port node.
  • the host after receiving the data write request to the virtual serial port node, the host obtains an address code of the serial port from the virtual serial port node, and according to the address
  • the step of encoding the data into the corresponding serial port includes:
  • the data write request after receiving the data write request sent by the host to the virtual serial port node, determining the type of the data write request; the data write request includes a serial port parameter setting request and a serial port data write request ;
  • the data write request is a serial port data write request
  • obtaining an address code of the corresponding serial port from the virtual serial port node and writing the serial port data into a corresponding one according to the address code.
  • the serial port
  • the step of sequentially reading data of each of the serial ports of each of the slaves, and storing the obtained data in a buffer of the corresponding virtual serial port node includes:
  • the present invention further provides a communication control apparatus, configured to implement communication between a host and each serial port of each slave, and the communication control apparatus includes a creation module, a data writing module, and data. Reading module
  • the creating module is configured to create a virtual serial port node corresponding to each of the serial ports of each of the slaves
  • the data writing module is configured to: after receiving a data write request sent by the host to the virtual serial port node, obtain an address code of the serial port from the virtual serial port node, and Writing the data to the corresponding serial port according to the address encoding;
  • the data reading module is configured to sequentially read data of each serial port of each of the slaves, and store the acquired data in a buffer of a corresponding virtual serial port node, The host can read the data of the corresponding serial port from the buffer of each virtual serial port node.
  • the creating module includes an acquiring unit, a creating unit, and a mapping unit.
  • the obtaining unit is configured to acquire an address code of the slave and an address code of each serial port of the slave;
  • the creating unit is configured to create a virtual serial port node corresponding to each of the serial ports
  • mapping unit is configured to perform addressing mapping on the virtual serial port node and the corresponding serial port.
  • the mapping unit is specifically configured to: code a handle of the virtual serial port node, address code of the corresponding slave device, address code of the corresponding serial port, and the virtual serial port node The code is mapped.
  • the data writing module includes a determining unit, a serial port parameter setting unit, and a serial port data writing unit;
  • the determining unit is configured to: after receiving the data write request sent by the host to the virtual serial port node, determine a type of the data write request; the data write request includes a serial port parameter setting Request and serial data write request;
  • the serial port parameter setting unit is configured to: after the data write request is a serial port parameter setting request, obtain an address code of the corresponding serial port from the virtual serial port node, and according to the address code Writing, by the serial port setting parameter, the corresponding serial port;
  • the serial port data writing unit is configured to: after the data writing request is a serial port data writing request, obtain an address code of the serial port from the virtual serial port node, and according to the address The encoding writes the serial port data to the corresponding serial port.
  • the data reading module includes a sending unit and a control unit;
  • the sending unit is configured to send a serial port data read request to the slave device
  • control unit is configured to: when the slave responds to the serial port data read request in a preset response time, store data of each serial port of the slave in a corresponding Virtual serial port node buffer
  • control unit is further configured to: when the slave does not respond to the serial port data read request in a preset response time, control the sending unit to send serial port data to the slave device Read the request.
  • the address serial code of the corresponding serial port can be obtained through the virtual serial port node, so as to implement data writing to the serial port.
  • the data of the corresponding serial port can be directly obtained by obtaining the data of the corresponding serial port from the buffer area of the virtual serial port node; the technical solution of the invention improves the communication mechanism between the serial port of the host and the slave, and effectively improves The communication efficiency and accuracy of the serial port between the host and the slave.
  • FIG. 1 is a flowchart of an embodiment of a communication control method according to the present invention.
  • FIG. 2 is a flow chart showing a first embodiment of creating a virtual serial port node corresponding to each of the serial ports of each of the slaves in FIG. 1;
  • FIG. 3 is a diagram showing the address code of the serial port obtained from the virtual serial port node after receiving the data write request sent by the host to the virtual serial port node in FIG.
  • Address code is a flowchart of an embodiment of the step of writing the data into the corresponding serial port;
  • FIG. 5 is a schematic block diagram of an embodiment of a communication control apparatus according to the present invention.
  • FIG. 6 is a schematic block diagram of an embodiment of creating a module in FIG. 5;
  • FIG. 7 is a block diagram of an embodiment of the data writing module of FIG. 5;
  • FIG. 8 is a block diagram of an embodiment of the data reading module of FIG. 5.
  • a communication control method includes the following steps: [0052] Step S100: creating a one-to-one correspondence with each of the serial ports of each of the slaves a virtual serial port node; [0053] step S200, after receiving a data write request sent by the host to the virtual serial port node, obtaining a corresponding address code of the serial port from the virtual serial port node, and according to The address encoding writes the data to the corresponding serial port;
  • step S300 sequentially reading data of each serial port of each of the slaves, and storing the obtained data in a buffer of the corresponding virtual serial port node, so that the host can The buffer of each virtual serial port node reads the data of the corresponding serial port.
  • Steps S200 and S300 are in no particular order and can be interchanged.
  • the host sequentially sends a serial port information scanning request to each slave. Then, according to the serial port information returned by the slave, a corresponding virtual serial port node is established in the communication control device (the virtual terminal clone device used in the present invention is /dev/ptmx), and the file directory and name of the virtual serial port node can be specified (for example, , /dev/vtseriall) , and number the virtual serial port nodes, and the actual slave serial port is bound with the struct structure to achieve one-to-one mapping.
  • the communication control device the virtual terminal clone device used in the present invention is /dev/ptmx
  • the file directory and name of the virtual serial port node can be specified (for example, , /dev/vtseriall)
  • number the virtual serial port nodes and the actual slave serial port is bound with the struct structure to achieve one-to-one mapping.
  • the handle of each created virtual serial port node is added to the read/write listening queue, and the event is triggered to trigger the reading and writing of the virtual serial port node.
  • the host and the slave are connected by RS485 communication; the slave and the front-end data collection terminal collect the unit.
  • the communication control device disposed on the host side sequentially sends a scan request to all connected slaves according to the address code of the slave.
  • the slave device responds to the communication control device with each serial port information of the slave.
  • the communication control device locally creates a virtual serial port section corresponding to each of the serial ports according to each serial port information. Point, and perform addressing mapping processing on the virtual serial port node and the corresponding serial port.
  • the host needs to write data to the serial port, the host sends a data write request.
  • the communication control device searches for the address code of the corresponding serial port in the mapping relationship between the corresponding virtual serial port node and the serial port according to the data write request.
  • the write data included in the data write request is then written to the serial port via RS485.
  • the communication control device reads the data of the serial port from the serial port and stores the read data to a corresponding virtual serial port node. In the buffer, the host can directly read the data of the corresponding serial port from the buffer of the virtual serial port.
  • the address serial code of the corresponding serial port can be obtained through the virtual serial port node, so as to implement data to the serial port.
  • the data can be read from the serial port of the virtual serial port to obtain the data of the serial port.
  • the step of creating a virtual serial port node corresponding to each of the serial ports of each of the slaves includes:
  • Step S110 Acquire an address code of the slave and an address code of each serial port of the slave.
  • Step S120 Create a virtual serial port node corresponding to each of the serial ports.
  • Step S130 performing addressing mapping on the virtual serial port node and the corresponding serial port; specifically, the handle of the virtual serial port node, the address of the corresponding slave device, and the corresponding serial port.
  • the address code, and the code of the virtual serial port node are mapped.
  • the address of each slave device needs to be encoded in sequence; and the address of each serial port of each of the slave devices is encoded. For example, if there are N slaves, each slave has M serial ports, then the address codes of the slaves are sequentially set to 0, 1, 2, ..., N; the address is encoded as 0. The address encoding of the serial port of the slave is set to 1, 2, 3, ..., M; the address code is
  • the address of the slave serial port of 1 is M+l, M+2, M+3, ..., M+M; the address of the serial port of the slave with address code 2 is 2M+1. 2M+2, 2M+3, 2M+M; ; The address code of the serial port whose address code is N slave is N*M+1, N*M+2, N*M+3, N*M+M . Then, corresponding to N*M+M serial ports, N*M+M virtual serial port nodes are created.
  • the virtual serial port node After addressing the corresponding serial port, the name of the virtual serial port node (named vt Se rial+ code, such as vtseriall), the file descriptor generated by the virtual serial port node, corresponding file identifier
  • the address encoding of the slave, and the encoding of the serial port corresponding to the slave are bound together using a C language struct structure to form an internal mapping of virtual serial node information, and then, the structure of all serial ports
  • the body information is stored in a list of linked lists.
  • the communication control device can find the virtual device from the list list according to the file descriptor of the virtual serial port node.
  • the structure information of the serial port node parses out the address code of the slave corresponding to the virtual serial port node and the address code of the serial port of the corresponding slave device, and makes correct serial port addressing, thereby effectively improving communication efficiency.
  • the slave when the scan of the slave does not respond within a certain time, the slave is added to the scan failure queue, and the slave follows the preset in the subsequent scan failure queue. Inter-turn interval training scan. After the mapping relationship is established, the handle is added to the select I/O listening list, and the virtual serial port node is read and written.
  • Step S210 Receive a data write request sent by the host to the virtual serial port node.
  • Step S220 Determine whether the data write request is a serial port parameter setting request; if yes, execute step 230; if no, execute step S240.
  • Step 230 Obtain an address code of the corresponding serial port from the virtual serial port node, and write the serial port setting parameter to the corresponding serial port according to the address code.
  • Step 240 Obtain an address code of the corresponding serial port from the virtual serial port node, and write the serial port data to the corresponding serial port according to the address code.
  • the application of the host accesses the virtual serial port node (for example, open (vtseriall, 0_RDWR)) through the open function of the system standard I/O, and accesses the virtual serial port node through the standard write function of the Linux system.
  • the data write request is sent to the communication control device through the virtual drive layer, and the communication control device parses the type of the data write request according to the data frame format defined in Table 1 below and Table 2 below.
  • the virtual serial port node When the data write request is a serial port parameter setting request, the virtual serial port node is queried from the virtual serial port node list table of the virtual serial port node. Point the corresponding slave serial port, and send the parsed serial communication parameters to the corresponding slave according to the internally defined master-slave communication protocol, so that the slave can set the corresponding serial port.
  • the data write request is a serial port data write request
  • the virtual serial port node list is addressed to the slave serial port corresponding to the virtual serial port node, and the parsed serial port data is sent according to the internally defined master-slave communication protocol. Go to the corresponding serial port on the slave to write data to the serial port.
  • the data of each serial port of each of the slaves is sequentially read, and the obtained data is stored in a buffer of a corresponding virtual serial port node.
  • the steps include:
  • step S310 sending a serial port data read request to a slave device
  • Step S320 determining whether the slave responds to the read request within a preset response time; if yes, executing step S330, and if no, executing step S340.
  • Step S330 storing data of each serial port of the slave device in a buffer area of the corresponding virtual serial port node
  • Step S340 Send a serial port data read request to the next slave.
  • the optimization principle of the training interval is: after sending a request to the slave to read all the serial port data on the slave, if the slave responds to the request within the preset response time, The data of each of the serial ports of the slave is stored in a buffer of the corresponding virtual serial port node; if the slave does not respond to the request within a preset response time, directly to the slave Send a serial data read request.
  • the integrity of the obtained serial port data can also be verified. After the integrity verification is passed, the data of each of the serial ports of the slave is stored in a buffer of the corresponding virtual serial port node. After the integrity verification fails, the obtained serial port data is discarded, and then the serial port data read request is sent to the slave.
  • a communication control apparatus configured to implement communication between a host and each serial port of each slave.
  • the communication control apparatus The creating module 410 is configured to create a virtual serial port node corresponding to each of the serial ports of each of the slaves; the data a writing module 420, configured to: after receiving a data write request sent by the host to the virtual serial port node, obtain an address code of the serial port from the virtual serial port node, and encode according to the address Write the data to the corresponding serial port; the data reading module 430 is configured to sequentially read data of each serial port of each of the slaves, and store the acquired data in the data. Corresponding buffers of the virtual serial port nodes, so that the host can read data of the corresponding serial port from the buffer of each virtual serial port node.
  • the host sequentially sends a serial port information scanning request to each slave. Then, according to the serial port information returned by the slave, a corresponding virtual serial port node is established in the communication control device (the virtual terminal clone device used in the present invention is /dev/ptmx), and the file directory and name of the virtual serial port node can be specified (for example, , /dev/vtseriall) , and number the virtual serial port nodes, and the actual slave serial port is bound with the struct structure to achieve one-to-one mapping.
  • the communication control device the virtual terminal clone device used in the present invention is /dev/ptmx
  • the file directory and name of the virtual serial port node can be specified (for example, , /dev/vtseriall)
  • number the virtual serial port nodes and the actual slave serial port is bound with the struct structure to achieve one-to-one mapping.
  • the handle of each created virtual serial port node is added to the read/write listening queue, and the event is triggered to trigger the reading and writing of the virtual serial port node.
  • the host and the slave are connected by RS485 communication.
  • the communication control device on the host side sequentially transmits a scan request to all connected slaves in accordance with the address code of the slave.
  • the slave device responds to the communication control device with each serial port information of the slave.
  • the communication control device locally creates a virtual serial port node corresponding to each of the serial ports in a local manner according to each of the serial port information, and performs address mapping processing on the virtual serial port node and the corresponding serial port.
  • the host needs to write data to the serial port, the host sends a data write request.
  • the communication control device searches for the address code of the corresponding serial port in the mapping relationship between the corresponding virtual serial port node and the serial port according to the data write request.
  • the write data contained in the data write request is then written to the serial port via R S485.
  • the communication control device reads the data of the serial port from the serial port and stores the read data to a corresponding virtual serial port node. In the buffer, the host can directly read the data of the corresponding serial port from the buffer of the virtual serial port.
  • the address serial code of the corresponding serial port can be obtained through the virtual serial port node, so as to implement data to the serial port.
  • the data can be read from the serial port of the virtual serial port to obtain the data of the serial port.
  • the creating module 410 includes an obtaining unit 412, a creating unit 414, and a mapping unit 416.
  • the obtaining unit 412 is configured to acquire an address code of the slave and the slave. The address of each of the serial ports of the machine is encoded; the creating unit 414 is configured to create a virtual serial port node corresponding to each of the serial ports; the mapping unit 416 is configured to the virtual serial port node and the corresponding The serial port does the addressing mapping.
  • the mapping unit 416 is specifically configured to map the handle of the virtual serial port node, the address encoding of the corresponding slave, the address encoding of the corresponding serial port, and the encoding of the virtual serial port node.
  • the address of each slave device needs to be encoded in sequence; and the address of each serial port of each of the slave devices is encoded. For example, if there are N slaves, each slave has M serial ports, then the address codes of the slaves are sequentially set to 0, 1, 2, ..., N; the address is encoded as 0. The address encoding of the serial port of the slave is set to 1, 2, 3, ..., M; the address code is
  • the address of the serial port of the slave is 1 M+l, M+2, M+3, ..., M+M; the address code is 2
  • the address code of the serial port of the slave is 2M+1, 2M+2, 2M+3, 2M+M;
  • the address code of the serial port whose address code is N slave is N*M+1, N*M+2 N*M+3, , N*M+M.
  • N*M+M virtual serial port nodes are created. After the virtual serial port node is mapped to the corresponding serial port, the name of the virtual serial port node (named vt Se rial+ code, such as vtseriall), and the virtual serial port node are generated.
  • a file descriptor, a corresponding address encoding of the slave, and an encoding of the serial port corresponding to the slave are bound together in a form of a C language struct structure to form an internal mapping of virtual serial port node information, and then , store all serial port structure information in a list linked list.
  • the communication control device can find the virtual device from the list list according to the file descriptor of the virtual serial port node.
  • the structure information of the serial port node parses out the address code of the slave corresponding to the virtual serial port node and the address code of the serial port of the corresponding slave device, and makes correct serial port addressing, thereby effectively improving communication efficiency.
  • the slave when the scan of the slave does not respond within a certain time, the slave is added to the scan failure queue, and the slave follows the preset in the subsequent scan failure queue. Inter-turn interval training scan. After the mapping relationship is established, the handle is added to the select I/O listening list, and the virtual serial port node is read and written.
  • the data writing module 420 includes a determining unit 422, a serial port parameter setting unit 424, and a serial port data writing unit 426.
  • the determining unit 422 is configured to receive the Determining, by the host, a data write request to the virtual serial port node, determining a type of the data write request; the data write request includes a serial port parameter setting request and a serial port data write request; and the serial port parameter setting unit 424 And configured to: after the data write request is a serial port parameter setting request, obtain an address code of the serial port from the virtual serial port node, and write the serial port setting parameter into a corresponding one according to the address code.
  • the serial port data writing unit 426 is configured to: after the data write request is a serial port data write request, obtain the address code of the serial port from the virtual serial port node, and according to the The address code writes the serial port data to the corresponding serial port.
  • the application of the host accesses the virtual serial port node (for example: open (vtseriall, 0_RDWR)) through the open function of the system standard I/O, and accesses the virtual function through the standard write function of the Linux system.
  • Serial port node and send data write request to communication control device through virtual drive layer
  • the communication control device parses out the type of the data write request according to the data frame format defined in Table 1 below and Table 2 below.
  • the virtual serial port node list table of the virtual serial port node is queried to the slave serial port corresponding to the virtual serial port node, and the parsed serial port communication parameter is determined according to the internally defined master-slave The communication protocol is sent to the corresponding slave, so that the slave can set the corresponding serial port.
  • the data write request is a serial port data write request
  • the virtual serial port node list is addressed to the slave serial port corresponding to the virtual serial port node, and the parsed serial port data is sent according to the internally defined master-slave communication protocol. Go to the corresponding serial port on the slave to write data to the serial port.
  • the data reading module 430 includes a sending unit 432 and a control unit 434.
  • the sending unit 432 is configured to send a serial port data read request to the slave.
  • the control unit 43 4 is configured to: when the slave responds to the serial port data read request in a preset response time, store data of each serial port of the slave in a corresponding virtual serial port node
  • the control unit 434 is further configured to: when the slave does not respond to the serial port data read request in a preset response time, control the sending unit 432 to the next slave Send a serial data read request.
  • the host and each slave communicate with each other through RS485, due to the electrical characteristics of the RS 485, the communication is prevented from conflicting, and the slaves cannot actively report the information to the host.
  • the application can only wait for the host to read.
  • the host sends a request to read the serial port data to all the slaves in turn by means of rotation training.
  • the optimization principle of the training interval is: after sending a request to the slave to read all the serial port data on the slave, if the slave responds to the request within the preset response time, The data of each of the serial ports of the slave is stored in a buffer of the corresponding virtual serial port node; if the slave does not respond to the request within a preset response time, directly to the slave Send a serial data read request.
  • the integrity of the obtained serial port data can also be verified. After the integrity verification is passed, the data of each of the serial ports of the slave is stored in a buffer of the corresponding virtual serial port node. After the integrity verification fails, the obtained serial port data is discarded, and then the serial port data read request is sent to the slave.
  • the foregoing method can be implemented by means of software plus a necessary general hardware platform, and can also be implemented by hardware, but in many cases.
  • the former is a better implementation.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk,
  • the optical disc includes a number of instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the methods described in various embodiments of the present invention.
  • the address serial code of the corresponding serial port can be obtained through the virtual serial port node, so as to implement data writing to the serial port;
  • the data of the corresponding serial port can be directly obtained by obtaining the data of the corresponding serial port from the buffer area of the virtual serial port node; the technical solution of the invention improves the communication mechanism between the serial port of the host and the slave machine, and effectively improves the host and the The communication efficiency and accuracy of the serial port of the slave.

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Abstract

L'invention concerne un procédé de commande de communication et un appareil de commande, appartenant au domaine technique des communications. Le procédé consiste à : créer un noeud en port série virtuel correspondant à chaque port en série de chaque esclave sur une base biunivoque; lorsqu'une demande d'écriture de données envoyée par un hôte au noeud de port série virtuel est reçue, acquérir, à partir du noeud de port série virtuel, un code d'adresse d'un port série correspondant, et écrire, en fonction du code d'adresse, des données dans le port série correspondant; et lire des données de chaque port série de chaque esclave en séquence, et stocker les données acquises dans une région tampon d'un noeud de port série virtuel correspondant, de sorte que l'hôte puisse lire, à partir de la région tampon de chaque noeud de port série virtuel, les données du port série correspondant. La solution technique de la présente invention améliore un mécanisme de communication entre un hôte et un port en série asservi, améliorant ainsi efficacement l'efficacité et la précision de communication entre l'hôte et le port série asservi.
PCT/CN2017/076760 2017-03-15 2017-03-15 Procede de commande de communication et appareil de commande WO2018165900A1 (fr)

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