CN104901877A - Multi-interface self-adaptive wireless heterogeneous network protocol conversion method and communication device - Google Patents

Abstract

A multi-interface adaptive wireless heterogeneous network protocol conversion method and communication device, the device consists of a processor and an SPI communication module, an RS485/RS232 serial communication module, a CAN communication module, an Ethernet interface communication module, an SDRAM memory unit, a Nand Flash memory, WIFI wireless radio frequency transceiver module, and ZigBee wireless radio frequency transceiver module are connected through the bus; the processor program uses the state control word to store and represent the conversion mapping relationship between interfaces, and independently completes the analysis and scheduling of corresponding resources. The protocol conversion program realizes protocol conversion between multiple protocols and protocols based on IEEE802.11 and 802.15.4 standards, and wired/wireless data analysis and forwarding. The invention can realize the data forwarding function between different wired interfaces and wireless interfaces, thereby realizing the advantages of multi-protocol and multi-interface communication intercommunication characteristics and the like.

Description

Multi-interface adaptive wireless heterogeneous network protocol conversion method and communication device

technical field

The invention relates to the field of embedded heterogeneous network communication, in particular to an adaptive conversion wireless heterogeneous network communication method and device with multiple interfaces.

Background technique

In the industrial site, the wired communication method needs to preset the engineering wiring pipeline, the construction cost is high, and it is greatly affected by the geographical environment, which is not conducive to maintenance and secondary upgrades. Simple, convenient maintenance, good adaptability and other advantages. In addition, the bus interfaces used in the industrial field bus are different, so a heterogeneous network communication device integrating multiple protocol interfaces is required.

Among existing communication technologies, wired and wireless network interworking technologies are very common. For example: Chinese patent application number is: 201120572125.3, the patent named "serial port wireless communication device", this device realizes the mutual conversion between serial port data and wireless network data based on IEEE802.11 standard, and communicates with IEEE802.11-based The standard wireless network performs data communication with the user's serial device through the serial port, thereby realizing the wireless communication between the user's serial device and the wireless network device based on the IEEE802.11 standard through the serial port. However, the device has a single use condition and does not consider the communication problem between different bus interfaces. Another example, the Chinese patent application number is: 201110423393.3, the patent titled "a multi-protocol multi-interface wireless sensor network gateway", the device solves the problem of wireless/wired data fusion in the existing wireless sensor network by designing a protocol conversion program , but the device cannot meet the requirements of intelligent wired/wireless data communication between RS485/RS232 bus, CAN bus, SPI bus equipment and wireless gateways in industrial sites.

It can be seen from the above that the existing electronic communication devices are too simple in equipment and principle, and cannot intelligently select the interface mode to communicate with other different interface devices, so it is difficult to adapt to the current requirements of the electronic communication industry or industrial sites, so a new one is urgently needed An electronic communication device to solve the above problems.

Contents of the invention

The purpose of the present invention is to provide a multi-interface self-adaptive wireless heterogeneous network protocol conversion method and a communication device that can intelligently select the interface mode and independently complete the conversion of different protocols.

In order to achieve the above purpose, the following technical solutions are adopted:

The multi-interface adaptive wireless heterogeneous network of the present invention includes a wired network and a wireless network, and the wired network is composed of an SPI communication module, an RS485/RS232 serial communication module, a CAN communication module, an Ethernet interface communication module and an embedded processor through the bus The wireless network is composed of WIFI wireless radio frequency transceiver module and ZigBee wireless radio frequency transceiver module connected with the embedded processor through the bus, and the embedded processor is also connected with SDRAM memory unit and Nand Flash memory;

The network protocol conversion method of the present invention is as follows:

Each frame of data of each interface must contain a state control word, where the first data byte of a valid data frame is a state control word, and the embedded processor stores the conversion mapping relationship between each interface through the state control word. Complete the analysis and scheduling of corresponding resources, and use the corresponding protocol conversion program to realize the protocol conversion between various protocols and protocols based on IEEE802.11 and 802.15.4 standards, as well as wired/wireless data analysis and forwarding; the protocol conversion program adopts multiplexing It exists as an upper-level application program of the embedded processor. After the system starts, it monitors all interfaces in the network, reads and identifies user demand instructions by monitoring the status control word, and first detects the status control of the received data packets. Word value and select the matching communication method to realize the virtual communication logic pipeline, automatically process and complete the reconstruction and analysis of protocol data between wired interfaces, as well as SPI protocol and standard wireless network protocol, Ethernet protocol and standard wireless network protocol , CAN protocol and standard wireless communication protocol, RS485/RS232 protocol and standard wireless communication protocol conversion, so as to realize the connection between equipment with SPI bus interface, Ethernet port interface, CAN interface or RS485/RS232 bus interface and remote terminal Seamless data communication between.

Wherein, the state control word occupies a memory space of one byte, wherein the lower 5 bits are effective domains, which respectively represent RS485/RS232 interface enablement, CAN interface enablement, SPI interface enablement, and Ethernet interface enablement from low to high. Enable, wireless enable, the corresponding binary representation is 00011111, in which 1 represents a valid bit, 0 represents an invalid bit, in which 1 represents the corresponding interface is enabled, and 0 represents the corresponding interface is disabled; the state control word is used to store the conversion between the interfaces Mapping relations.

In the process of data interaction of different protocols, the memory mapping method is used to share the same pre-allocated linear address range between the interfaces communicating with each other, so as to meet different user needs and realize wired/wireless data communication between different protocols .

The logical pipeline refers to the real-time dynamic analysis and reconstruction of data between different interfaces through the processor, so as to realize a seamless communication mode independent of specific physical interfaces.

Communication device of the present invention is made up of embedded processor external module; Described external module comprises SPI communication module, RS485/RS232 serial port communication module, CAN communication module, Ethernet interface communication module, SDRAM memory unit, Nand Flash memory, WIFI Wireless radio frequency transceiver module and ZigBee wireless radio frequency transceiver module; external module and embedded processor are connected by bus connection, built-in protocol conversion program, SPI communication module, RS485/RS232 serial communication module, CAN communication module, Ethernet interface communication module respectively Connect with their respective interface devices, and complete the wireless communication functions between different interface devices and remote host computers and the data format conversion between different interfaces through the WIFI wireless radio frequency transceiver module and ZigBee wireless radio frequency transceiver module.

Compared with prior art, the present invention has following advantage:

1. The network protocol conversion method can use the protocol conversion program to realize the exchange of various interface data such as RS485/RS232, CAN, SPI, TCP/IP, and wireless network data based on IEEE802.11 and 802.15.4 standards. At the same time, it can also realize Data format conversion between multiple bus interfaces, so as to achieve the purpose of wireless communication between user equipment with RS485/RS232 interface, CAN interface, Ethernet interface or SPI interface and remote terminal as well as mutual communication with different interfaces to reduce costs .

2. The communication device has the advantages of small size, easy to use, and strong expansion ability, and provides a convenient and fast communication method for different wired devices and remote terminals.

Description of drawings

Fig. 1 is a schematic diagram of the network of the device of the present invention.

Fig. 2 is a hardware connection block diagram of the device of the present invention.

Fig. 3 is a control state word address mapping chart of the method of the present invention.

Fig. 4 is a program flow chart of the method of the present invention.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing:

Communication device of the present invention is made up of embedded processor external module; Described external module comprises SPI communication module, RS485/RS232 serial port communication module, CAN communication module, Ethernet interface communication module, SDRAM memory unit, Nand Flash memory, WIFI Wireless radio frequency transceiver module and ZigBee wireless radio frequency transceiver module; external module and embedded processor are connected by bus connection, built-in protocol conversion program, SPI communication module, RS485/RS232 serial communication module, CAN communication module, Ethernet interface communication module respectively Connect with their respective interface devices, and complete the wireless communication functions between different interface devices and remote host computers and the data format conversion between different interfaces through the WIFI wireless radio frequency transceiver module and ZigBee wireless radio frequency transceiver module.

FIG. 1 is a schematic diagram of a network where the device of the present invention is applied. The applied wireless heterogeneous network includes wired devices and wireless devices. Wired devices support RS485/RS232, CAN, SPI, TCP/IP and other interfaces; wireless devices support devices based on IEEE802.11 and 802.15.4 standards. The above-mentioned wired and wireless devices are connected to the communication device of the present invention to realize data communication between the wired device and the wireless device and between interfaces.

Fig. 2 is the hardware connection block diagram of device of the present invention, and described communication device is made up of embedded processor external module; External module comprises SPI communication module, RS485/RS232 serial port communication module, CAN communication module, Ethernet interface communication module, SDRAM memory unit, Nand Flash memory, WIFI wireless radio frequency transceiver module and ZigBee wireless radio frequency transceiver module; the external module and the embedded processor are connected by bus connection, built-in protocol conversion program, SPI communication module, RS485/RS232 serial communication module, CAN communication module The Ethernet interface communication modules are connected to their respective interface devices, and the wireless communication functions between different interface devices and remote host computers and the data format conversion between different interfaces are completed through the WIFI wireless radio frequency transceiver module and the ZigBee wireless radio frequency transceiver module. The embedded processor runs the embedded Linux operating system, uniformly reads and writes and controls chip selection of each control module, analyzes and distributes the interface data, and uses the protocol conversion program to realize multiple protocols and standards based on IEEE802.11 and 802.15.4 Protocol conversion between protocols and wired/wireless data analysis and forwarding, to complete the effective transmission of data on the address bus and data bus. The embedded processor automatically selects the frequency band with less wireless noise to work according to the surrounding radio frequency environment information. At the same time, the WIFI network and the ZigBee network are separated as far as possible when selecting the working frequency band to ensure that there will be no communication interference between devices.

The embedded processor is the core part of the entire heterogeneous network communication device, and its main function is to control the external modules to work together according to the needs, so as to realize the collection and processing of data. The embedded processor of the present invention adopts AT91SAM9G25 chip based on ARM926EJ-S kernel of ATMEL company, and the integrated hardware function peripherals include: 1 ITU-RBT, 1 high-speed CAN host computer and CAN host computer full-speed dedicated on-chip transceiver, 1 10 /100Mbps Ethernet MAC controller, two high-speed memory card hosts, two master/slave serial peripheral interfaces, two three-channel 32-bit timers/counters, one 4-channel 16-bit PWM controller, four USARTs, 2 UARTs, 1 12-channel 10-bit analog-to-digital converter, 1 soft modem, 1 three-wire interface, etc. To sum up, the performance and rich external interfaces of the AT91SAM9G25 embedded processor can meet the requirements of heterogeneous network communication devices.

The RS485/RS232 serial communication module is divided into serial port 1 and serial port 2, of which serial port 1 is connected with peripheral RS232 devices through the MAX3232 chip to realize data exchange between peripheral devices with RS232 interface and heterogeneous network communication devices, and this serial port can also realize The function of the communication interface selection configuration. In the present invention, the serial port 2 is connected to the peripheral equipment through the isolation 485 chip, and the isolation 485 chip is selected ADM2483. This chip is an enhanced RS485 transceiver with isolation released by ADI, which is applicable to the two-way data communication of the multipoint bus transmission line, and realizes Data exchange between peripheral equipment with RS485 interface and heterogeneous network communication devices.

This design sets the fixed parameters of the device by configuring the serial port, such as the Ethernet IP address of the device, WIFI network access operation, 802.15.4 network operation, wireless radio frequency communication frequency band selection, bus interface communication rate, master-slave mode, etc. information.

The CAN communication module realizes the data exchange between the peripheral equipment with the CAN communication interface and the heterogeneous network communication device using CAN, and supports the master-slave mode.

The SPI communication module implements data exchange between peripheral equipment with an SPI communication interface and heterogeneous network communication devices using SPI, and supports master-slave mode. The input signal line of the SPI communication module in the present invention selects SPI0_MISO, the output signal line selects SPI0_MOSI, the clock control line selects SPI0_SPCK, and the chip select signal line selects SPI0_NPCS0. The control command of the user terminal can be received by using the protocol conversion program, and the heterogeneous network communication device can be configured as the SPI master mode or the SPI slave mode.

The Ethernet interface chip in the Ethernet port communication module adopts DM9161AEP, which provides a data rate of 10/100Mb/s, and realizes data exchange between devices with Ethernet interfaces and multi-protocol, multi-interface heterogeneous network communication devices.

The WIFI wireless radio frequency transceiver module adopts the rt3070 chip of MediaTek Company, supports IEEE802.11g/b/n standard communication protocol, the working frequency is 2.4-2.4835GHz, and the transmission rate can reach up to 150M. The WIFI wireless radio frequency transceiver module is connected to the ARM central processor through the USB interface, and the heterogeneous network communication device is connected to the WIFI network through the WIFI wireless radio frequency transceiver module, so as to realize the connection between the device with the WIFI protocol and the multi-protocol multi-interface heterogeneous network communication device data exchange.

The ZigBee wireless radio frequency transceiver module adopts the RF231 chip of ATMEL Company, supports the standard 802.15.4 protocol and the expanded ZigBee protocol, the ZigBee wireless radio frequency transceiver module is connected with the ARM central processor through SPI, and the heterogeneous network communication device is connected through the ZigBee wireless radio frequency transceiver module To the ZigBee network, realize data exchange between equipment with standard 802.15.4 protocol and ZigBee protocol and multi-protocol, multi-interface heterogeneous network communication devices, and support master station and slave station settings.

The heterogeneous network of the present invention comprises wired network and wireless network, and wired network is made up of SPI communication module, RS485/RS232 serial port communication module, CAN communication module, Ethernet interface communication module and embedded processor through bus connection, and wireless network consists of WIFI wireless radio frequency transceiver module and ZigBee wireless radio frequency transceiver module and embedded processor are formed by bus connection, and embedded processor is connected with SDRAM memory unit, Nand Flash memory in addition; Described network protocol conversion method is as follows:

Each frame of data of each interface must contain a state control word, where the first data byte of a valid data frame is a state control word, and the embedded processor stores the conversion mapping relationship between each interface through the state control word. Complete the analysis and scheduling of corresponding resources, and use the corresponding protocol conversion program to realize the protocol conversion between various protocols and protocols based on IEEE802.11 and 802.15.4 standards, as well as wired/wireless data analysis and forwarding; the protocol conversion program adopts multiplexing It exists as an upper-level application program of the embedded processor. After the system starts, it monitors all interfaces in the network, reads and identifies user demand instructions by monitoring the status control word, and first detects the status control of the received data packets. Word value and select the matching communication method to realize the virtual communication logic pipeline, automatically process and complete the reconstruction and analysis of protocol data between wired interfaces, as well as SPI protocol and standard wireless network protocol, Ethernet protocol and standard wireless network protocol , CAN protocol and standard wireless communication protocol, RS485/RS232 protocol and standard wireless communication protocol conversion, so as to realize the connection between equipment with SPI bus interface, Ethernet port interface, CAN interface or RS485/RS232 bus interface and remote terminal Seamless data communication between.

The state control word occupies a memory space of one byte, wherein the lower 5 bits are effective domains, which respectively represent RS485/RS232 interface enablement, CAN interface enablement, SPI interface enablement, Ethernet interface enablement, Wireless enable, the corresponding binary representation is 00011111, where 1 represents a valid bit and 0 represents an invalid bit. The specific corresponding relationship is shown in Figure 3, where 1 represents the corresponding interface is enabled, and 0 represents the corresponding interface that is disabled; through the status control word to It stores the conversion mapping relationship between interfaces.

In the process of data interaction of different protocols, the memory mapping method is used to share the same pre-allocated linear address range between the interfaces communicating with each other, so as to meet different user needs and realize wired/wireless data communication between different protocols .

The logical pipeline refers to the real-time dynamic analysis and reconstruction of data between different interfaces through the processor, so as to realize a seamless communication mode independent of specific physical interfaces. For example: the external device is connected to the device through the RS485 interface, and the binary representation of the status control word of the data packet is 00010001b after analysis, which means that the data of this packet needs to be forwarded by the wireless interface, and the system starts to execute the RS485 to wireless program, and so on for the rest.

The specific implementation is as follows. When a certain wired interface needs to forward data to multiple terminal devices, the communication program in the present invention allocates corresponding threads to different connections, and realizes respective virtual communication logic channels in different threads. For example, the remote device connects to this device through the Ethernet interface, and its IP addresses are IP1:192.168.1.2 and IP2:192.168.1.3 respectively. Among them, IP1 is from Ethernet interface to RS485 interface, and IP2 is from Ethernet interface to CAN interface. If the thread assigned to IP1 by the communication program is 1, and the thread assigned to IP2 is 2, then in thread 1, judge whether the state control word of the frame is 00010001b, and in thread 2, judge whether the state control word of the frame is 00010010b, thereby Determine the Ethernet to RS485 of IP1 and the Ethernet to CAN program of IP2 and execute them respectively.

Fig. 4 is a program flow chart of the method of the present invention. The device of the invention adopts an embedded Linux operating system, and has the advantages of multiple hardware platform support, excellent performance, good network support, and the like. The management of hardware resources and software resources, as well as the scheduling of multiple tasks can be well realized through the Linux operating system. The protocol conversion program exists as an upper-layer application program of a heterogeneous network communication device. It adopts a multiplexing method, reads and recognizes user demand instructions by monitoring the status control word, and executes the corresponding serial port to wireless, SPI to wireless, CAN to CAN Wireless, Ethernet port to wireless communication and wired interface communication conversion program. In the process of data interaction of different protocols, the memory mapping method is adopted, and the interfaces that communicate with each other share the same allocated linear address range, so as to meet different user needs and realize wired/wireless data communication between different protocols . The program flow is as follows:

(1) System initialization, configure network, serial port, SPI, CAN and other communication interface parameters;

(2) Establish a server, monitor the interface connection request, and establish a virtual connection with the corresponding remote device;

(3) Create a thread for each connection request and allocate a memory mapping area;

(4) monitor the interface data frame state control word, and read the client user instruction information;

(5) Judging the command communication mode and executing the corresponding communication program;

(6) judge whether there is termination communication program instruction, if not, then return to step (4), if have, then release occupied memory, close current connection, end current thread;

(7) Judging whether there is a program end instruction, if not, then return to step (3), if there is, then close all connections, and the program ends.

The communication device of the present invention uses a corresponding interface to perform data interaction with an external device, and sends the data to the embedded processor through the corresponding bus, and uses the protocol conversion program to convert the processed data to the embedded processor through the Linux operating system. The data is parsed into the data format of the corresponding interface through the application scenario:

(1) If it is a conversion between wired interfaces, the program will analyze and reconstruct the obtained data and forward it to the corresponding wired interface.

(2) If it is a wired-to-wireless application, the wireless radio frequency transceiver module encapsulates the data into a corresponding standard protocol format and sends it to the remote terminal according to the enable bit of the status control word.

(3) Conversely, the remote terminal can also send the control or configuration data to the corresponding device in the opposite direction.

The protocol conversion program exists as an upper-layer application program of the operating system, and is combined with the hardware of the heterogeneous network communication device. After the protocol conversion program obtains the data information of the remote terminal, it judges the destination of the data message, performs correct analysis, processing and forwarding, and realizes the communication between the remote terminal and different interface devices.

The above-mentioned embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the scope of the present invention. All such modifications and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (6)

1. the adaptive Wireless Heterogeneous Networks communicator of multiplex roles, is characterized in that: described communicator is made up of flush bonding processor external connection module; Described external connection module comprises SPI communication module, RS485/RS232 serial communication modular, CAN, Ethernet interface communication module, sdram memory unit, Nand flash storage, WIFI radio frequency transceiving module and ZigBee radio frequency transceiving module; External connection module and flush bonding processor adopt bus connecting mode to be connected, built-in protocol convertor, SPI communication module, RS485/RS232 serial communication modular, CAN, Ethernet interface communication module are connected with respective interface equipment respectively, complete the Data Format Transform between the radio communication function of different interface devices and long-range host computer and distinct interface by WIFI radio frequency transceiving module and ZigBee radio frequency transceiving module.

2. the adaptive Wireless Heterogeneous Networks communicator of multiplex roles according to claim 1, is characterized in that: described flush bonding processor runs built-in Linux operating system.

3. the adaptive Wireless Heterogeneous Networks method for converting protocol of multiplex roles, it is characterized in that, described network comprises cable network and wireless network, cable network is connected to form by bus by SPI communication module, RS485/RS232 serial communication modular, CAN, Ethernet interface communication module and flush bonding processor, wireless network is connected to form by bus by WIFI radio frequency transceiving module and ZigBee radio frequency transceiving module and flush bonding processor, and flush bonding processor is separately connected with sdram memory unit, Nand flash storage; Described procotol conversion method is as follows:

Mode control word must be comprised in every frame data of each interface, wherein first data byte of valid data frame is mode control word, flush bonding processor deposits the conversion map relation represented between each interface by mode control word, independently complete the analysis to respective resources and scheduling, utilize corresponding protocol convertor to realize various protocols and based on the protocol conversion between IEEE802.11 and 802.15.4 standard agreement and wire/wireless Data Analysis and forwarding, protocol convertor adopts multiplex mode, as flush bonding processor upper level applications and exist, after system starts, total interface in network is monitored, by listening state control word, read and identify user's request instruction, the value of the packet received first detected state control word also selects the communication mode matched, realize virtual communication logic pipeline, the protocol data reconstruct that automatic process completes between wireline interface is resolved, and SPI protocol and standard wireless network agreement, Ethernet protocol and standard wireless network agreement, CAN protocol and standard wireless communication agreement, conversion between RS485/RS232 protocols and standards wireless communication protocol, thus realize with spi bus interface, Ethernet interface interface, seamless data communication between the equipment of CAN interface or RS485/RS232 bus interface and remote terminal.

4. a kind of method according to claim 3, it is characterized in that: described mode control word takies the memory headroom of a byte, wherein low 5 is active domain, represent RS485/RS232 interface enable from low to high respectively, CAN interface enable, SPI interface enable, Ethernet interface are enable, wireless enabled, corresponding binary representation is 00011111, and wherein 1 represent significance bit, 0 represents invalid bit, wherein 1 represent enable the corresponding interface, 0 represents anergy the corresponding interface; The conversion map relation represented between each interface is deposited by mode control word.

5. a kind of method according to claim 3, it is characterized in that: carry out in mutual process in different agreement data, adopt memory-mapped mode, same section of pre-assigned linear address is shared interval between the interface intercomed mutually, thus reach for different user's requests, realize the wire/wireless data communication between different agreement.

6. a kind of method according to claim 3, is characterized in that: described logical pipe refers to that the data between distinct interface carry out real-time dynamic analysis reconstruct by processor, thus realizes the seamless communication mode not relying on concrete physical interface.