CN107911372B - Method and device for realizing access of serial device to Ethernet based on logic device - Google Patents
Method and device for realizing access of serial device to Ethernet based on logic device Download PDFInfo
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- CN107911372B CN107911372B CN201711188951.6A CN201711188951A CN107911372B CN 107911372 B CN107911372 B CN 107911372B CN 201711188951 A CN201711188951 A CN 201711188951A CN 107911372 B CN107911372 B CN 107911372B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/08—Protocols for interworking; Protocol conversion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/18—Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
Abstract
The application provides a method and a device for realizing access of serial port equipment to an Ethernet based on a logic device, which are applied to network equipment, wherein the logic device generates a simulated serial port through a simulated serial port communication protocol and is connected between the serial port equipment and the network equipment, and the method comprises the following steps: when detecting that the serial port equipment is accessed to any simulated serial port, judging the equipment type of the serial port equipment; determining an implementation mode for performing read-write operation on the analog serial port; wherein the implementation corresponds to the device type; reading serial port data from an analog serial port accessed by the serial port equipment based on the implementation mode; and converting the serial port data into Ethernet data. By adopting the technical scheme provided by the application, the flexibility of the serial port equipment when the serial port equipment is accessed into the Ethernet can be improved.
Description
Technical Field
The present application relates to the field of network technologies, and in particular, to a method and an apparatus for implementing access of a serial device to an ethernet network based on a logic device.
Background
The serial device is a device which adopts a serial port as a transmission interface, generates serial data based on a serial protocol and transmits the serial data through the serial port. The serial port protocols adopted by different types of serial port equipment are different.
When the serial port device is accessed to the Ethernet to transmit the serial port data to the Ethernet, because the serial port data adopts a serial port protocol, the Ethernet data adopts an Ethernet protocol, and the devices for transmitting the data with different protocols cannot be connected, if the serial port device needs to be successfully accessed to the Ethernet, a data conversion module needs to be added between the serial port device and the Ethernet device, and the data conversion module is used for converting the serial port data into the Ethernet data.
In the prior art, the data conversion module generally adopts a serial port conversion chip, a serial port expansion chip, a serial port server chip, and the like. Referring to fig. 1, fig. 1 is a diagram illustrating a network architecture for implementing access of a serial device to an ethernet based on a serial conversion chip in the prior art.
Because the data conversion modules such as the serial port conversion chip and the like cannot be compatible with the serial port devices with various different serial port protocols, when the data conversion module is selected, the serial port protocol adopted by the serial port device needs to be known first, and then the data conversion module matched with the serial port device needs to be selected, so that the flexibility of the data conversion modules such as the serial port conversion chip and the like is poor.
Disclosure of Invention
In view of this, the present application provides a method and an apparatus for implementing access of a serial device to an ethernet based on a logic device, which are applied to a network device and used for improving access flexibility when the serial device is accessed to the ethernet.
Specifically, the method is realized through the following technical scheme:
a method for realizing access of serial port equipment to Ethernet based on logic device is applied to network equipment, the logic device generates simulated serial port through simulated serial port communication protocol, and connects between the serial port equipment and the network equipment, the method includes:
when detecting that the serial port equipment is accessed to any simulated serial port, judging the equipment type of the serial port equipment;
determining an implementation mode for performing read-write operation on the analog serial port; wherein the implementation corresponds to the device type;
reading serial port data from an analog serial port accessed by the serial port equipment based on the implementation mode;
and converting the serial port data into Ethernet data.
A device for realizing access of serial port equipment to Ethernet based on logic device is applied to network equipment, the logic device generates a simulation serial port through a simulation serial port communication protocol and is connected between the serial port equipment and the network equipment, the device comprises:
the judging unit is used for judging the equipment type of the serial equipment when detecting that the serial equipment is accessed to any simulated serial port;
the determining unit is used for determining an implementation mode of performing read-write operation on the analog serial port; wherein the implementation corresponds to the device type;
the reading unit is used for reading serial port data from the analog serial port accessed by the serial port equipment based on the implementation mode;
and the conversion unit is used for converting the serial port data into Ethernet data.
The technical scheme provided by the application brings beneficial effects;
in the application, the logic device is used as a hardware connecting device when the serial port equipment is connected to the Ethernet, wherein the logic device generates a simulated serial port through a simulated serial port communication protocol and is connected between the serial port equipment and the network equipment. When the serial device is accessed to any analog serial port generated by the logic device, the network device can judge the device type of the serial device, determine the implementation mode corresponding to the device type for performing read-write operation on the analog serial port, read data from the analog serial port based on the implementation mode, convert the read data into Ethernet data and forward the Ethernet data. The network equipment can automatically identify the equipment type of the serial equipment accessed to the logic device and then configure the relevant operation corresponding to the equipment type, so that the flexibility of the serial equipment when being accessed to the Ethernet can be improved.
Drawings
Fig. 1 is a network architecture diagram for implementing access of a serial device to an ethernet based on a serial conversion chip in the prior art;
fig. 2 is a network architecture diagram for implementing access of a serial device to an ethernet based on a logic device according to an embodiment of the present application;
fig. 3 is a flowchart of a method for implementing access of a serial device to an ethernet based on a logic device according to an embodiment of the present application;
fig. 4 is a structural diagram of a simulated serial port generated based on a logic device according to an embodiment of the present application;
fig. 5 is a hardware structure diagram of a network device where a device for implementing access of a serial device to an ethernet based on a logic device according to the present application is located;
fig. 6 is a device for implementing access of a serial device to an ethernet based on a logic device according to the second embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
In the prior art, the connection relationship among the serial device, the serial conversion chip and the network device is shown in fig. 1, and the serial conversion chip is connected between the serial device and the network device. After the serial port device generates serial port data and sends the serial port data to the serial port conversion chip, the serial port conversion chip needs to convert the serial port data into ethernet data, and then the ethernet data is uploaded to the network device, and the network device forwards the ethernet data.
Because the serial port conversion chip cannot be compatible with the serial port devices of different device types, and the serial port protocols adopted by the serial port devices of different device types are different, the serial port protocol adopted by the serial port device needs to be known before the serial port conversion chip of a specific model is selected, and then the serial port conversion chip matched with the serial port device is selected, so that the serial port conversion chip is poor in flexibility
In addition, the serial port conversion chip does not have a serial port driver, and in order to enable the serial port conversion chip to successfully establish communication with the serial port device and process serial port data, the serial port conversion chip must be configured with the serial port driver.
However, when the serial port conversion chip uses a serial port controller to call a serial port driver registration mechanism given in a system configured by a network device, after the serial port conversion chip converts serial port data into ethernet data and uploads the ethernet data to the network device, a processor of the network device performs some operations on the ethernet data at an application layer, and then forwards the ethernet data.
For the ethernet data to be forwarded, some operations performed on the ethernet data by the processor of the network device at the application layer are redundant, which not only prolongs the software processing delay of data communication, but also increases the processing load of the network device to a certain extent.
Example one
In order to solve the problem of poor flexibility of a serial port conversion chip in the prior art and the disadvantage caused by a serial port driver registration mechanism given in a system in which the serial port conversion chip uses a serial port controller to call network device configuration, an embodiment of the present application shows a method for implementing access of a serial port device to an ethernet network based on a logic device, please refer to fig. 2, and fig. 2 is a network architecture diagram for implementing access of a serial port device to an ethernet network based on a logic device in an embodiment of the present application.
As shown in fig. 2, in terms of hardware structure, compared with the prior art, the logic device in this embodiment replaces the original serial port conversion chip, and the connection mode between the logic device and the serial port device and the network device is not changed. The Logic Device may be a CPLD (Complex Programmable Logic Device), an FPGA (Field Programmable Gate Array), or the like.
Referring to fig. 3, fig. 3 is a flowchart of a method for implementing access of a serial device to an ethernet based on a logic device according to an embodiment of the present application. The following steps are specifically executed:
step 301: when detecting that the serial port equipment is accessed to any simulated serial port, judging the equipment type of the serial port equipment;
step 302: determining an implementation mode for performing read-write operation on the analog serial port; wherein the implementation corresponds to the device type;
step 303: reading serial port data from an analog serial port accessed by the serial port equipment based on the implementation mode;
step 304: and converting the serial port data into Ethernet data.
The logic device generates a simulated serial port according to an RS standard simulated serial port communication protocol, wherein the simulated serial port comprises a serial port data sending module, a serial port data receiving module, a baud rate generating module, a serial port data sending queue buffer area, a serial port data receiving queue buffer area, a sending register and a receiving register. As shown in fig. 4, fig. 4 is a structural diagram of an analog serial port generated based on a logic device according to an embodiment of the present application.
However, the analog serial port generated by the analog logic device only provides a channel for establishing connection with the serial device, and if the logic device is to realize successful communication with the serial device, the logic device needs to adopt a corresponding serial driver as a serial driver registration mechanism given in a system in which a serial conversion chip is configured by a network device in the prior art is required to realize successful communication with the serial device.
In order to achieve the purpose that a logic device can be compatible with serial devices of various different device types and improve the operability of a serial port, the embodiment of the application provides a new serial port driver. The serial port driver is loaded in the network equipment and has the functions of detecting the type of the serial port equipment, configuring relevant parameters of the analog serial port, controlling data transmission between the analog serial port and the serial port equipment and the like.
In this embodiment, when the network device detects that the serial device is accessed to the logic device, the network device may configure related parameters (baud rate, data bit, stop bit, parity bit, and the like of the serial port) for serial initialization for the analog serial port accessed to the serial device through the loaded serial driver, and register read-write operation for the analog serial port, so that the analog serial port has a read-write function.
After the network device completes the configuration of the serial port initialization parameters for the simulated serial port, the type of the serial port device accessed to the simulated serial port can be judged. The serial devices in the current market can be mainly divided into two serial devices, namely byte stream type devices (such as terminal display devices) and asynchronous byte control type devices (such as keyboards). The characteristic of serial port data sent by the byte stream type equipment is different from the characteristic of serial port data sent by the asynchronous byte control type equipment.
In order to reasonably allocate resources, the network device usually selects a corresponding mode to implement read-write operation on the serial port according to the characteristic that serial port devices of different device types send serial port data. For a byte throttling type device, a network device usually adopts a polling mode to realize read-write operation on a serial port, and for an asynchronous byte control type device, the network device usually adopts an interruption mode to realize read-write operation on the serial port.
Therefore, when the network device determines the device type of the serial device accessing the logic device, the network device may search for the implementation mode of performing read-write operation on the analog serial port corresponding to the device type, and then register the implementation mode of the serial read-write operation corresponding to the analog serial port accessed by the serial device, that is, call the program corresponding to the implementation mode and the program of performing read-write operation on the analog serial port accessed by the serial device, so that the network device can perform read-write operation on the serial port through the mode.
In the prior art, a protocol processing operation for converting serial data into ethernet data is executed by a serial conversion chip, and the serial conversion chip, as an executor, can only perform corresponding operations according to a pre-loaded program, but cannot change the loaded program. Therefore, the serial port conversion chip has poor flexibility.
In order to meet the requirement of accessing serial devices adopting different serial protocols, an executor executing an operation of converting serial data into ethernet data needs to have a function of changing or switching a program to be operated. In the present embodiment, the operation of converting serial data into ethernet data is performed by the network device.
In order to implement the function of converting serial data into ethernet data, in this embodiment, the network device also registers a related operation of a protocol process on the serial device, so that the network device can implement the function of converting serial data into ethernet data. After the network equipment reads the serial port data from the serial port, the conversion operation is carried out on the serial port data through the registered related operation for the protocol processing of the serial port equipment.
In addition, some network devices have certain requirements for the manner of converting serial data into ethernet data, or some network devices generally configure some corresponding special protocols in order to meet the conversion requirements of some serial data with characteristics.
In this embodiment, after the network device registers the operation of the protocol processing on the serial device for the analog serial port, it is usually determined whether a special protocol for converting serial data into ethernet data exists in the protocol configured at the home terminal, and if so, the special protocol is initialized.
The following describes an exemplary process of converting serial data into ethernet data in conjunction with the serial port structure shown in fig. 4.
For example, when the serial device 1 is connected to the analog serial port 1 of the logic device, the network device configures the parameters related to the initialization serial port for the analog serial port 1, and registers the read-write operation. Then, the network device may detect the type of the serial device 1, register a corresponding serial read/write operation mode, such as an interrupt mode, according to the detection result, and register a related operation of a serial device protocol process.
When the serial device 1 and the analog serial port 1 successfully achieve communication, a sending module in the analog serial port 1 may receive serial data sent by the serial device 1, and then the sending module may transmit the received serial data to a sending queue buffer. If the serial port data does not exist in the sending register or the storage threshold value is not reached, the sending queue buffer area can transmit the serial port data to the sending register.
The network device can read the serial port data from the sending register in a registered serial port read-write operation mode, then converts the serial port data into Ethernet data according to the registered related operation of the protocol processing of the serial port device, and forwards the Ethernet data.
Similarly, when the network device receives the ethernet data sent to the serial device 1, the network device converts the ethernet data into serial data and writes the serial data into a receiving register simulating the serial device 1 according to the registered related operations of the serial device protocol processing, the receiving register can transmit the serial data to a receiving queue buffer, and the receiving module reads the serial data in the receiving queue buffer and sends the serial data to the serial device 1.
In this embodiment, in order to avoid a packet loss phenomenon and the like caused by the exhaustion of storage resources of the analog serial port of the logic device, the network device may coordinate the rate difference by monitoring the state of the buffer area, controlling the rate of reading the serial port data from the sending register and the rate of sending the serial port data to the receiving register.
In summary, the logic device is used as a hardware connection device when the serial device is connected to the ethernet, wherein the logic device generates an analog serial port through an analog serial port communication protocol, and is connected between the serial device and the network device. When the serial device is accessed to any analog serial port generated by the logic device, the network device can judge the device type of the serial device, determine the implementation mode corresponding to the device type for performing read-write operation on the analog serial port, read data from the analog serial port based on the implementation mode, convert the read data into Ethernet data and forward the Ethernet data. The network equipment can automatically identify the equipment type of the serial equipment accessed to the logic device and then configure the relevant operation corresponding to the equipment type, so that the flexibility of the serial equipment when being accessed to the Ethernet can be improved.
Example two
Corresponding to the first embodiment of the method for realizing the access of the serial device to the ethernet based on the logic device, the application also provides a second embodiment of the device for realizing the access of the serial device to the ethernet based on the logic device.
The second embodiment of the device for realizing the access of the serial device to the ethernet based on the logic device can be applied to network devices. The device embodiments may be implemented by software, or by hardware, or by a combination of hardware and software. The software implementation is taken as an example, and is formed by reading corresponding computer program instructions in the nonvolatile memory into the memory for operation through the processor of the network device where the software implementation is located as a logical means. In terms of hardware, as shown in fig. 5, a hardware structure diagram of a network device where a device for implementing access of a serial device to an ethernet based on a logic device according to the present application is located is shown, except for the processor, the memory, the network interface, and the nonvolatile memory shown in fig. 5, the network device where the device in the second embodiment is located may also include other hardware according to an actual function of implementing access of the serial device to the ethernet based on the logic device, which is not described again.
Referring to fig. 6, fig. 6 is a diagram illustrating an apparatus for implementing access of a serial device to an ethernet based on a logic device according to a second embodiment of the present application, where the logic device generates an analog serial port through an analog serial port communication protocol, and is connected between the serial device and a network device, and the apparatus includes: a judging unit 610, a determining unit 620, a reading unit 630 and a converting unit 640.
The determining unit 610 is configured to determine a device type of a serial device when it is detected that the serial device accesses any analog serial port;
the determining unit 620 is configured to determine an implementation manner of performing read-write operation on the analog serial port; wherein the implementation corresponds to the device type;
the reading unit 630 is configured to read serial port data from an analog serial port accessed by the serial port device based on the implementation manner;
the converting unit 640 is configured to convert the serial port data into ethernet data.
Wherein, the determining unit 620 specifically includes:
the searching subunit is used for searching the implementation mode of performing read-write operation on the analog serial port corresponding to the equipment type;
and the calling subunit is used for calling a program corresponding to the implementation mode and a program for performing read-write operation on the simulated serial port accessed by the serial port equipment.
In this embodiment, the apparatus further includes:
the initialization unit is used for initializing the simulation serial port accessed by the serial device based on an initialization program when the fact that the serial device is accessed to the simulation serial port is detected.
In addition, the analog serial port generated by the logic device through the analog serial port communication protocol includes a buffer module of serial port data and a register, and in this embodiment, the apparatus further includes:
the monitoring unit is used for monitoring the state of the serial port data buffering module and the state of the register;
the adjusting unit is used for adjusting the working state of the analog serial port through a preset adjusting mechanism; wherein the adjustment mechanism is related to the state of the serial port data buffer module and the state of the register.
The implementation process of the functions and actions of each unit in the above device is specifically described in the implementation process of the corresponding step in the above method, and is not described herein again.
For the device embodiments, since they substantially correspond to the method embodiments, reference may be made to the partial description of the method embodiments for relevant points. The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of the application. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (6)
1. A method for realizing access of serial port equipment to Ethernet based on logic device is applied to network equipment, and is characterized in that the logic device generates a simulated serial port through a simulated serial port communication protocol and is connected between the serial port equipment and the network equipment, the method comprises the following steps:
when detecting that the serial port equipment is accessed to any simulated serial port, judging the equipment type of the serial port equipment;
searching an implementation mode for performing read-write operation on the analog serial port corresponding to the equipment type; calling a program corresponding to the implementation mode and a program for performing read-write operation on a simulated serial port accessed by the serial port equipment;
reading serial port data from an analog serial port accessed by the serial port equipment based on the implementation mode;
and converting the serial port data into Ethernet data.
2. The method of claim 1, further comprising:
when detecting that the serial device is accessed to the analog serial port, initializing the analog serial port accessed to the serial device based on an initialization program.
3. The method of claim 1, wherein the analog serial port comprises a serial data buffer module and a register, and the method further comprises:
monitoring the state of the serial port data buffer module and the state of a register;
adjusting the working state of the simulated serial port through a preset adjusting mechanism; wherein the adjustment mechanism is related to the state of the serial port data buffer module and the state of the register.
4. The utility model provides a device for realizing serial devices inserts ethernet based on logic device, is applied to network equipment, and its characterized in that, logic device passes through simulation serial ports communication protocol and generates simulation serial ports, connects between serial devices and network equipment, the device includes:
the judging unit is used for judging the equipment type of the serial equipment when detecting that the serial equipment is accessed to any simulated serial port;
the determining unit is used for searching an implementation mode corresponding to the equipment type for performing read-write operation on the analog serial port, calling a program corresponding to the implementation mode and performing read-write operation on the analog serial port accessed by the serial port equipment;
the reading unit is used for reading serial port data from the analog serial port accessed by the serial port equipment based on the implementation mode;
and the conversion unit is used for converting the serial port data into Ethernet data.
5. The apparatus of claim 4, further comprising:
the initialization unit is used for initializing the simulation serial port accessed by the serial device based on an initialization program when the fact that the serial device is accessed to the simulation serial port is detected.
6. The apparatus of claim 4, wherein the analog serial port comprises a serial data buffer module and a register, the apparatus further comprising:
the monitoring unit is used for monitoring the state of the serial port data buffering module and the state of the register;
the adjusting unit is used for adjusting the working state of the analog serial port through a preset adjusting mechanism; wherein the adjustment mechanism is related to the state of the serial port data buffer module and the state of the register.
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| CN109474798A (en) * | 2018-12-28 | 2019-03-15 | 安徽三人信息科技有限公司 | A kind of serial ports conversion HDMI display device |
| CN113360443B (en) * | 2021-05-31 | 2022-07-08 | 浪潮电子信息产业股份有限公司 | Serial port card communication realization method, device, equipment and readable storage medium |
| CN113489639B (en) * | 2021-06-16 | 2022-12-02 | 杭州深渡科技有限公司 | Gateway multi-interface data communication method and system |
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