CN106708762B - unified management system and method for serial port equipment under LINUX - Google Patents
unified management system and method for serial port equipment under LINUX Download PDFInfo
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- CN106708762B CN106708762B CN201510794209.4A CN201510794209A CN106708762B CN 106708762 B CN106708762 B CN 106708762B CN 201510794209 A CN201510794209 A CN 201510794209A CN 106708762 B CN106708762 B CN 106708762B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR 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
- G06F13/382—Information transfer, e.g. on bus using universal interface adapter
- G06F13/385—Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0042—Universal serial bus [USB]
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Abstract
the invention discloses a system and a method for unified management of serial devices under LINUX, wherein the system comprises: the serial port management system comprises a kernel space part and a user space part, wherein serial port resources are arranged on an operating system layer of the kernel space part, a serial port application is arranged on an application program layer of the user space part, a dynamic library layer is arranged between the operating system layer and the application program layer, and the dynamic library layer is arranged on the user space part and comprises a serial port management core module used for managing various serial port devices and calling corresponding serial port resources to carry out serial port communication and a registry module used for associating serial port ID numbers with serial port device nodes. The technical scheme of the invention realizes the purpose of providing a universal interface for the upper layer application, improving the efficiency of data interaction and reducing the complexity of application programming and the maintenance and management cost of the serial port service.
Description
Technical Field
The invention relates to the field of communication, in particular to a system and a method for unified management of serial devices under LINUX.
Background
linux system has more and more used in on-vehicle application, and a vehicle-mounted platform needs external a plurality of serial devices, for example taximeter, LCD screen, LED screen, printer etc. if connect the 2G module and need use pseudo-terminal, the inside data interaction of procedure also can use pseudo-terminal, if connect the 3G module and need use USB to change the serial ports, be equivalent to the vehicle-mounted platform needs to manage a plurality of physics, virtual and extension serial ports. If the management is performed respectively, no matter a receiving thread is opened up for each serial port to perform blocking receiving, or a periodic non-blocking polling operation is performed, the efficiency of data interaction is low, and the complexity of application programming is increased.
meanwhile, the physical serial port has the unique characteristic and operation mode of the physical serial port; the pseudo terminal has unique characteristics and operation modes of the pseudo terminal; the USB-to-serial port has unique characteristics and operation modes of the USB-to-serial port, although the application program layers are the same in use, the interfaces and the use methods provided by the system are different, application developers need to deeply know the use of specific interfaces of various serial ports, the development efficiency is reduced, and the development difficulty and the maintenance and management cost of serial port services are increased.
disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a system and a method for uniformly managing serial devices under LINUX, realizes the purpose of providing a universal interface for upper-layer application, and achieves the purposes of improving the efficiency of data interaction and reducing the complexity of application programming and the maintenance and management cost of serial services.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a unified management system for serial devices under LINUX comprises a kernel space part and a user space part, wherein serial resources are arranged on an operating system layer of the kernel space part, a serial application is arranged on an application program layer of the user space part, a dynamic library layer is arranged between the operating system layer and the application program layer, and the dynamic library layer is arranged on the user space part and comprises:
a serial management core module and a registry module;
the registry module receives and registers registry entries provided by the registry interface unit, and registered serial port attribute information comprises serial port ID numbers, serial port type identifiers, serial port equipment paths and receiving buffer sizes.
The serial port management core module comprises:
the application interface unit is used for providing a uniform interface for serial application;
Specifically, the unified interface includes: the device comprises an initialization interface, a serial port parameter setting interface and a serial port reading and writing interface, wherein the serial port parameter setting comprises setting of baud rate, start bit, stop bit, parity check state and the like.
The registry interface unit provides registry entries for the registry module to register so as to realize the mapping between serial port ID numbers and serial port equipment nodes;
the annular buffer area unit buffers the received serial port data and waits for a user to read the data;
a multiplexing switching management unit for providing the multiplexing switching of the serial port descriptor;
specifically, the multiplexing uses a select system function, which comprises a maximum monitoring descriptor, a read descriptor set, a write descriptor set, an error descriptor set and a timer timeout time, and the serial port device descriptor is added into the multiplexing read descriptor set when a serial port is opened for initialization;
furthermore, the multiplexing unit is designed into a thread, a select function is used in the thread to perform blocking reception on all serial port data, and when data comes in any serial port, the thread is awakened to start the reception of the serial port data.
furthermore, the read descriptor set comprises a pipeline read descriptor, the pipeline read descriptor is created and added into the read descriptor set when the system is initialized and serves as an event source for adding a subsequent serial port device descriptor, when any serial port is opened, a message of 1 byte is sent to the pipeline and serves as an event, the multiplexing transfer management unit calls to obtain the event through select, event processing is further triggered, and the newly opened serial port device descriptor is added into the read descriptor set.
specifically, the serial port resource includes: physical serial port resources, USB-to-serial port resources and pseudo terminal serial port resources.
specifically, the serial application includes: physical serial application, USB-to-serial application, and pseudo-terminal serial application.
a unified management method for serial devices under LINUX comprises the following steps:
layering a linux system, and adding a dynamic library layer in an application program layer and an operating system layer;
a serial port management core module and a registry module are arranged in the dynamic library layer;
registering serial port attribute information into a registry through a registry module, wherein the serial port attribute information comprises a serial port ID number, a serial port type identifier, a serial port equipment path and a receiving buffer area size;
The multi-path switching of the serial port descriptor is realized through a multi-path switching management unit in the serial port management core module;
The buffer of the received serial port data is realized through a ring buffer unit in the serial port management core module;
providing a uniform interface for serial application through an application interface unit in a serial management core module;
Further, the implementation of the multiplexing of the serial port descriptor by the multiplexing management unit in the serial port management core module includes:
using a select system function, wherein the function comprises a maximum monitoring descriptor, a descriptor reading set, a descriptor writing set, an error descriptor set and timer timeout time, and adding a serial port device descriptor into a multi-channel descriptor reading set when a serial port is opened for initialization;
the multiplexing unit is designed into a thread, a select function is used in the thread to block and receive all serial port data, and when any serial port has data coming in, the thread is awakened to start the receiving of the serial port data.
The method comprises the steps that a read descriptor set comprises a pipeline read descriptor, the pipeline read descriptor is created and added into the read descriptor set when a system is initialized and serves as an event source for adding a subsequent serial port device descriptor, when any serial port is opened, a message of 1 byte is sent to a pipeline and serves as an event, a multiplexing transfer management unit calls to obtain the event through select, event processing is further triggered, and the newly opened serial port device descriptor is added into the read descriptor set.
Further, providing a uniform interface for the serial application through the application interface unit in the serial management core module includes:
providing an initialization interface, a serial port parameter setting interface and a serial port read-write interface, wherein the serial port parameter setting comprises setting of baud rate, start bit, stop bit, parity check form and the like.
the technical scheme provided by the invention has the beneficial effects that: by adding a middleware layer between an operating system layer and an application program layer, using a multipath transfer function select and a user space ring buffer area and realizing the technical scheme of managing the data reception of all serial ports through a thread, the serial port ID number and the serial port device descriptor are in one-to-one correspondence, a universal interface is provided for upper-layer application, and the aims of improving the data interaction efficiency and reducing the complexity of application programming and the serial port service maintenance management cost are fulfilled.
the present invention is described in further detail with reference to the drawings and the embodiments, but the system and the method for unified management of serial devices under LINUX are not limited to the embodiments.
drawings
FIG. 1 is a schematic block diagram of an embodiment of the system of the present invention;
FIG. 2 is a flow chart of the process of the unified receiving of serial port data according to the embodiment of the method of the present invention;
fig. 3 is a flowchart of a process for uniformly sending serial data according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, the unified management system for serial devices under LINUX of the present invention includes a kernel space portion and a user space portion, a serial resource 11 is disposed in an operating system layer of the kernel space portion, a serial application 12 is disposed in an application program layer of the user space portion, a dynamic library layer is disposed between the operating system layer and the application program layer, and the dynamic library layer is disposed in the user space portion and includes a serial management core module 13 and a registry module 14;
The registry module 14 receives and registers the registry key provided by the registry interface unit 132, and the registered serial attribute information includes a serial ID number, a serial type identifier, a serial device path, and a size of a receiving buffer.
the serial management core module 13 includes:
A multiplexing management unit 130 providing multiplexing of the serial port descriptor;
the ring buffer unit 131 buffers the received serial port data and waits for a user to read the data;
the registry interface unit 132 is used for providing registry entries for registering registry modules and realizing mapping between serial port ID numbers and serial port equipment nodes;
the application interface unit 133 provides a uniform interface for serial application, including an initialization interface, a serial parameter setting interface, and a serial read-write interface;
Specifically, the multiplexing uses a select system function, which comprises a maximum monitoring descriptor, a read descriptor set, a write descriptor set, an error descriptor set and a timer timeout time, and the serial port device descriptor is added into the multiplexing read descriptor set when a serial port is opened for initialization;
furthermore, the multiplexing unit is designed into a thread, a select function is used in the thread to perform blocking reception on all serial port data, and when data comes in any serial port, the thread is awakened to start the reception of the serial port data.
Furthermore, the read descriptor set comprises a pipeline read descriptor, the pipeline read descriptor is created and added into the read descriptor set when the system is initialized and serves as an event source for adding a subsequent serial port device descriptor, when any serial port is opened, a message of 1 byte is sent to the pipeline and serves as an event, the multiplexing transfer management unit calls to obtain the event through select, event processing is further triggered, and the newly opened serial port device descriptor is added into the read descriptor set.
specifically, the serial port resource includes: physical serial port resources, USB-to-serial port resources and pseudo terminal serial port resources.
specifically, the serial application includes: physical serial application, USB-to-serial application, and pseudo-terminal serial application.
in this embodiment, the registry module collects serial port attribute information, such as serial port ID number, serial port type identifier, serial port device path, and size of receiving buffer, according to a predetermined format.
Specifically, including 4 physical serial ports, two USB commentaries on classics serial ports, two pairs of pseudo-terminals, a pseudo-terminal master equipment and a pseudo-terminal slave unit constitute a pseudo-terminal pair, and the registry module form is as shown in the table:
when the system is initialized, the parameter information is registered in a registry, and the type of the corresponding serial device, the path of the serial device and the size of a data receiving buffer zone can be known through the serial ID number.
for a physical serial port, a serial port device is directly opened and set through a device path, so that the registered path is the path of a serial port device node;
For a USB-to-serial port, a serial port ID number changes along with each plugging and unplugging, and a device node path of the USB-to-serial port needs to be acquired through a USB attribute parameter when the USB-to-serial port is opened every time, so that the registered path is a physical attribute path of the USB-to-serial port;
for the pseudo terminal main equipment, the same equipment node path is used every time the pseudo terminal main equipment is opened, so the pseudo terminal main equipment is fixed to be/dev/ptmx;
for the pseudo terminal slave device, the pseudo terminal master device corresponding to the pseudo terminal slave device is always depended on, so the serial port ID number mapped by the pseudo terminal master device corresponding to the pseudo terminal slave device is filled in the device path.
In this embodiment, unified management of different types of serial devices is realized, so that an application layer does not need to pay attention to the physical type of a serial port, and all serial devices are different from one another only by one serial ID number for the application layer.
the process of performing application interaction through the serial port ID number is as follows:
An application program requests to initialize a serial port through a serial port ID number, and a dynamic library layer searches the type of serial port equipment corresponding to the serial port ID number, the path information of the serial port equipment and the size of a receiving buffer zone in a registry according to the serial port ID number transmitted by the application program;
the dynamic library layer operates a system calling interface corresponding to the serial device according to the attribute and path information of the serial device to open the serial device, set the baud rate, set the check bit and set the size of the buffer area;
the dynamic library layer binds serial port ID numbers and descriptors for opening the serial port equipment, specifically, when the serial port equipment is opened, the open system calls descriptors for associating serial port equipment paths and the serial port equipment paths, and because the serial port ID numbers and the serial port equipment paths are associated during registration, the serial port ID numbers and the serial port equipment descriptors corresponding to the serial port ID numbers are in one-to-one correspondence;
The serial port device descriptor set is incorporated into a multi-path switching management module for unified management;
the subsequent data can be received and transmitted through the descriptor of the serial device.
the real-time serial port data receiving and processing flow of the unified management method of the serial port equipment under LINUX of the invention is shown in figure 2 and comprises the following steps:
Step 201: building a pipeline;
specifically, a dynamic library is initialized and an anonymous pipe is created when the dynamic library is started.
step 202: starting a receiving thread;
specifically, a serial port data receiving thread is created and started when the dynamic library is started.
Step 203: initializing a read descriptor set of select;
step 204: in a data receiving thread, adding a read descriptor identifier of a pipeline into a read descriptor set of select;
step 205: adding the opened serial port device descriptor into a select read descriptor set;
specifically, whether various types of serial ports which are opened exist is checked during initialization, and if the serial port device descriptor exists, the serial port device descriptor is added into a select read descriptor set.
step 206: calling select to wait for blocking without timeout;
Step 207: judging whether an event exists in the pipeline or not;
Specifically, after the select returns, a pipeline event is checked, if the pipeline has an event, it indicates that one or more serial devices are opened, and step 208 is performed; if not, go to step 209;
step 208: calling a read function to read a pipeline event;
Specifically, the open serial device descriptor needs to be added to the read descriptor set of select in real time, and the process returns to the step 203.
Step 209: polling a serial port device descriptor to check whether data exists in a serial port;
step 210: judging whether the polling of the serial port device descriptor is finished or not;
Specifically, if the detection of all serial device descriptors is completed, the step 203 is returned to; otherwise, step 211 is performed.
step 211: judging whether the serial port has data or not;
specifically, whether the serial device descriptor detected this time has data is judged, if no data exists, the step 210 is returned, and other serial device descriptors are continuously detected; if there is data, step 212 is performed.
step 212: reading serial port data and writing the data into a ring buffer area;
Specifically, after the serial port data is written into the ring buffer, the process returns to step 210.
The real-time serial port data sending and processing flow of the unified management method of the serial port equipment under LINUX of the invention is shown in figure 3 and comprises the following steps:
Step 301: requesting to send data by an application program;
Step 302: the dynamic library layer finds a serial port device descriptor corresponding to the ID number according to the transmitted serial port ID number;
step 303: and submitting the data to an operating system layer through the serial port device descriptor by using a system function write to send.
the technical scheme provided by the invention has the beneficial effects that: by adding a middleware layer between an operating system layer and an application program layer, using a multipath transfer function select and a user space ring buffer area and realizing the technical scheme of managing the data reception of all serial ports through a thread, the serial port ID number and the serial port device descriptor are in one-to-one correspondence, a universal interface is provided for upper-layer application, and the aims of improving the data interaction efficiency and reducing the complexity of application programming and the serial port service maintenance management cost are fulfilled.
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. a unified management system for serial devices under LINUX comprises a kernel space part and a user space part, wherein serial resources are arranged on an operating system layer of the kernel space part, and a serial application is arranged on an application program layer of the user space part, and is characterized in that: setting a dynamic library layer between the operating system layer and the application program layer, wherein the dynamic library layer is arranged in the user space part and comprises the following steps:
a serial management core module and a registry module;
The registry module receives and registers registry entries provided by the registry interface unit, and registered serial port attribute information comprises serial port ID numbers, serial port type identifiers, serial port equipment paths and receiving buffer areas;
The serial port management core module comprises:
the application interface unit is used for providing a uniform interface for serial application;
The registry interface unit provides registry entries for the registry module to register so as to realize the mapping between serial port ID numbers and serial port equipment nodes;
the annular buffer area unit buffers the received serial port data and waits for a user to read the data;
and the multiplexing switching management unit provides multiplexing switching of the serial port device descriptor.
2. the unified management system for serial devices under LINUX of claim 1, wherein:
The said multiplex uses the select system function, the function includes maximum monitoring descriptor, reading descriptor set, writing descriptor set, error descriptor set and timer overtime, add the serial port device descriptor into the multiplex reading descriptor set when opening the serial port and initializing;
the multi-path switching unit is designed into a thread, a select function is used in the thread to block and receive all serial port data, when any serial port has data, the thread is awakened, and the serial port data is started to be received;
The read descriptor set comprises a pipeline read descriptor, the pipeline read descriptor is created and added into the read descriptor set when a system is initialized and serves as an event source for adding a subsequent serial port device descriptor, when any serial port is opened, a message of 1 byte is sent to the pipeline and serves as an event, the multiplexing transfer management unit calls to obtain the event through select, event processing is further triggered, and the newly opened serial port device descriptor is added into the read descriptor set.
3. The system for unified management of serial devices under LINUX of claim 1, wherein said providing a unified interface for serial applications comprises: the device comprises an initialization interface, a serial port parameter setting interface and a serial port reading and writing interface.
4. the system for unified management of serial devices under LINUX of claim 1, wherein the serial resources comprise: physical serial port resources, USB-to-serial port resources and pseudo terminal serial port resources.
5. The system for unified management of serial devices under LINUX according to claim 1, wherein the serial applications comprise: physical serial application, USB-to-serial application, and pseudo-terminal serial application.
6. A unified management method for serial devices under LINUX is characterized by comprising the following steps:
Layering a linux system, and adding a dynamic library layer in an application program layer and an operating system layer;
A serial port management core module and a registry module are arranged in the dynamic library layer;
registering serial port attribute information into a registry through a registry module, wherein the serial port attribute information comprises a serial port ID number, a serial port type identifier, a serial port equipment path and a receiving buffer area size;
the multi-path switching of the serial port descriptor is realized through a multi-path switching management unit in the serial port management core module;
The buffer of the received serial port data is realized through a ring buffer unit in the serial port management core module;
providing a uniform interface for serial application through an application interface unit in a serial management core module;
And providing a registry table entry through a registry table interface unit in the serial management core module for the registry table module to register, and realizing the mapping between the serial ID number and the serial device node.
7. the method of claim 6, wherein the step of implementing the multiplexing of the serial port descriptor through the multiplexing management unit in the serial port management core module comprises:
Using a select system function, wherein the function comprises a maximum monitoring descriptor, a descriptor reading set, a descriptor writing set, an error descriptor set and timer timeout time, and adding a serial port device descriptor into a multi-channel descriptor reading set when a serial port is opened for initialization;
The multiplexing unit is designed into a thread, a select function is used in the thread to block and receive all serial port data, when any serial port has data, the thread is awakened, and the serial port data is started to be received;
the method comprises the steps that a read descriptor set comprises a pipeline read descriptor, the pipeline read descriptor is created and added into the read descriptor set when a system is initialized and serves as an event source for adding a subsequent serial port device descriptor, when any serial port is opened, a message of 1 byte is sent to a pipeline and serves as an event, a multiplexing transfer management unit calls to obtain the event through select, event processing is further triggered, and the newly opened serial port device descriptor is added into the read descriptor set.
8. the method for unified management of serial devices under LINUX of claim 6, wherein said providing a unified interface for serial applications through an application interface unit in a serial management core module comprises:
And providing an initialization interface, a serial port parameter setting interface and a serial port reading and writing interface.
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| CN107329916B (en) * | 2017-06-13 | 2019-06-04 | 北京深之度科技有限公司 | A kind of USB device control method, device and calculate equipment |
| CN108255542B (en) * | 2018-01-05 | 2021-08-10 | 北京北信源信息安全技术有限公司 | Serial port and parallel port control method and device of virtual machine |
| CN109491878A (en) * | 2018-09-26 | 2019-03-19 | 深圳市吉祥腾达科技有限公司 | A method of equipment of serial Log is acquired by USB flash disk |
| CN109783417B (en) * | 2019-01-11 | 2022-03-15 | 四川长虹电器股份有限公司 | Serial port communication device and method |
| CN110244983B (en) * | 2019-05-30 | 2022-04-12 | 百富计算机技术（深圳）有限公司 | Method for fixing serial port number, terminal equipment and storage medium |
| CN110795375A (en) * | 2019-10-31 | 2020-02-14 | 浪潮金融信息技术有限公司 | Communication method for operating serial port and HID peripheral based on linux |
| CN111371869A (en) * | 2020-02-26 | 2020-07-03 | 山西鲲博时代信息科技有限公司 | Multi-channel communication monitoring method based on intelligent multi-channel gateway |
| CN111416778B (en) * | 2020-03-16 | 2023-02-24 | 南京荣泰电气自动化有限公司 | Single serial port gateway platform for multi-device Internet of things |
| CN113347025A (en) * | 2021-05-20 | 2021-09-03 | 上海上讯信息技术股份有限公司 | Method and device for operation and maintenance serial port device |
| CN116610467B (en) * | 2023-07-21 | 2023-10-20 | 烟台东方威思顿电气有限公司 | Energy controller serial port management method |
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