CN114116566B - Serial port expansion system based on multipath packet scheduling algorithm - Google Patents
Serial port expansion system based on multipath packet scheduling algorithm Download PDFInfo
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- CN114116566B CN114116566B CN202111430153.6A CN202111430153A CN114116566B CN 114116566 B CN114116566 B CN 114116566B CN 202111430153 A CN202111430153 A CN 202111430153A CN 114116566 B CN114116566 B CN 114116566B
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- 230000003139 buffering effect Effects 0.000 claims description 2
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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
- G06F2213/0002—Serial port, e.g. RS232C
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Abstract
The invention provides a serial port expansion system based on a multipath packet scheduling algorithm, wherein an MCU unit is connected with a PC end through a USB-to-serial port interface and performs data transmission; the multi-serial port of the MCU unit is connected with the serial ports of the plurality of terminal devices, the corresponding serial ports of the terminal devices are selected through the multiplexing selector unit, and packet data transmission is carried out on the serial ports of the plurality of terminal devices through a packet scheduling algorithm; the MCU is also externally connected with the SRAM unit, and the cache technology is adopted to ensure that the error rate in communication can be reduced even when a large amount of data are interacted, the data cannot be lost, the abnormal breakdown of the system cannot be caused, and the reliability of the system is improved; the packet scheduling algorithm is used, so that excessive bandwidth occupation is effectively avoided, system fairness is guaranteed, and meanwhile, the maximum network throughput is obtained as much as possible, and the communication rate of the equipment can be further improved; the method has the advantages of expanding the number of serial ports, reducing communication interference, saving cost and the like, and is wide in application range.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a serial port expansion system based on a multipath packet scheduling algorithm.
Background
With the rapid development of internet technology and internet of things, market demands of devices with a sufficient number of serial ports are gradually increased, for example, downloading devices from a production end needs to support multi-serial port channel downloading and testing, and devices at an application end also need to have multi-serial port channels for data acquisition.
The existing serial port expansion method generally uses software to simulate serial ports or adopts a special serial port expansion chip to expand serial ports (including parallel port to serial port), but the schemes have the problems of high cost, low speed and high error rate, and meanwhile, the problem that a plurality of peripheral circuits/peripheral devices are in communication with a main control chip through the serial ports to cause data loss and communication errors cannot be avoided.
Therefore, a serial port expansion system based on a multi-path packet scheduling algorithm is needed, which can solve the problems of limited serial port number and difficult expansion of the existing serial port equipment.
Disclosure of Invention
The invention aims to provide a serial port expansion system based on a multipath packet scheduling algorithm, which solves the problems of limited serial port number and difficult expansion of the existing serial port equipment.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a serial port expansion system based on a multipath packet scheduling algorithm, which comprises a PC end and terminal equipment, wherein the PC end and the terminal equipment are connected through an MCU expansion device;
the MCU expansion device comprises an MCU unit, wherein the MCU unit is respectively connected with the PC end and the terminal equipment, the MCU unit is also connected with a multiplexing selector unit, an SRAM unit and a FLASH unit, and the multiplexing selector unit is connected with the terminal equipment.
Preferably, the terminal device is a WiFi module, a WiFi chip or an application terminal WiFi data collector.
Preferably, the MCU unit adopts a CC2538 series singlechip.
Preferably, the multiplexer selector unit adopts TMUX1209 series multiplexer selector.
Preferably, the packet scheduling method of the multiplexing selector unit includes the steps of:
(1) Each 4 terminal devices are organized into a serial port of a group of butt joint MCU units;
(2) The MCU unit is used for controlling the multiplexing selector unit to select a first terminal device in a group of terminal devices to start data interaction;
(3) The MCU unit accumulates the time counter of the MCU unit, when the time counter is overtime, the MCU unit starts to perform data interaction by controlling the multiplexing selector unit to select the next terminal equipment in a group of terminal equipment;
(4) And when the data transmission of each section is finished, the counter of the terminal equipment is accumulated, and when the counter of the terminal equipment is accumulated to 4, the counter of the terminal equipment is set to 1 and the time counter of the MCU unit is set to 0.
Compared with the prior art, the invention has the following beneficial technical effects:
The invention provides a serial port expansion system based on a multi-path packet scheduling algorithm, wherein a PC end and terminal equipment are connected through an MCU expansion device, and the system is combined with the multi-path serial port MCU through expansion, multiplexing selection, data caching and packet scheduling algorithm. The MCU is connected with the PC end through a USB-to-serial interface and performs data transmission; the multi-serial port of the MCU unit is connected with the serial ports of the plurality of terminal devices, the corresponding serial ports of the terminal devices are selected through the multiplexing selector unit, and packet data transmission is carried out on the serial ports of the plurality of terminal devices through a packet scheduling algorithm; the MCU is also externally connected with the SRAM unit to buffer the uplink data and the downlink data and process and transmit the data successively according to the priority of the data, and a buffer technology is adopted to ensure that the error rate in communication can be reduced even when a large amount of data are interacted, the data cannot be lost, the abnormal breakdown of the system cannot be caused, and the reliability of the system is improved; the packet scheduling algorithm is used, so that excessive bandwidth occupation is effectively avoided, system fairness is guaranteed, and meanwhile, the maximum network throughput is obtained as much as possible, and the communication rate of the equipment can be further improved; the method has the advantages of expanding the number of serial ports, reducing communication interference, saving cost and the like, and is wide in application range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a connection relationship of a serial port expansion system based on a multi-path packet scheduling algorithm;
In the figure: 1: PC side, 2: terminal equipment, 3: MCU expanding device, 31: MCU unit, 32: multiplexing selector unit, 33: SRAM cell, 34: and a FLASH unit.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a serial port expansion system based on a multipath packet scheduling algorithm, which aims to solve the problems of limited serial port number and difficult expansion of the existing serial port equipment.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1:
The embodiment provides a serial port expansion system based on a multipath packet scheduling algorithm, which comprises a PC end 1 and a terminal device 2, wherein the PC end 1 and the terminal device 2 are connected through an MCU expansion device 3 as shown in figure 1; the MCU expansion device 3 comprises an MCU unit 31, the MCU unit 31 is respectively connected with the PC terminal 1 and the terminal equipment 2, the MCU unit 31 is also connected with a multiplexing selector unit 32, an SRAM unit 33 and a FLASH unit 34, and the multiplexing selector unit 32 is connected with the terminal equipment 2.
Specifically, the terminal device 2 may be a WiFi module, a WiFi chip, or an application terminal WiFi data collector.
Further, the MCU unit 31 adopts a micro CC2538 series single chip microcomputer with rich interfaces, which can be connected with various external devices and control them, and is connected with a PC end through a USB to serial interface and performs data transmission, the CC2538 series single chip microcomputer is further externally connected with an SRAM unit, and data is stored in real time on the SRAM unit, so as to play a role in buffering uplink and downlink data, and perform sequential data processing and transmission according to the priority of the data.
Further, the multiplexer selector 32 unit employs a TMUX1209 series multiplexer selector. Because the CC2538 series single-chip microcomputer only has 4 UART/USART communication serial ports, and terminal equipment with 16 serial port channels is required to be expanded outside, communication cannot be carried out in a serial port 1-to-1 mode, hardware multiplexing is required to be carried out on the serial ports of the CC2538 series single-chip microcomputer, serial port switching and mode selection are carried out by introducing a TMUX1209 series multiplexing selector and executing a packet scheduling algorithm, and the problem of insufficient serial ports of equipment is solved.
Further, the packet scheduling method of the multiplexer unit 32 includes the steps of:
(1) Each 4 terminal devices are organized into a serial port of a group of butt joint MCU units;
(2) The MCU unit is used for controlling the multiplexing selector unit to select a first terminal device in a group of terminal devices to start data interaction;
(3) The MCU unit accumulates the time counter of the MCU unit, when the time counter is overtime, the MCU unit starts to perform data interaction by controlling the multiplexing selector unit to select the next terminal equipment in a group of terminal equipment;
(4) And when the data transmission of each section is finished, the counter of the terminal equipment is accumulated, and when the counter of the terminal equipment is accumulated to 4, the counter of the terminal equipment is set to 1 and the time counter of the MCU unit is set to 0.
The invention provides a serial port expansion system based on a multipath packet scheduling algorithm, wherein an MCU unit is connected with a PC end through a USB serial port interface and performs data transmission; the multi-serial port of the MCU unit is connected with the serial ports of the plurality of terminal devices, the corresponding serial ports of the terminal devices are selected through the multiplexing selector unit, and packet data transmission is carried out on the serial ports of the plurality of terminal devices through a packet scheduling algorithm; the MCU is also externally connected with the SRAM unit to buffer the uplink data and the downlink data and process and transmit the data successively according to the priority of the data, and a buffer technology is adopted to ensure that the error rate in communication can be reduced even when a large amount of data are interacted, the data cannot be lost, the abnormal breakdown of the system cannot be caused, and the reliability of the system is improved; the packet scheduling algorithm is used, so that excessive bandwidth occupation is effectively avoided, system fairness is guaranteed, and meanwhile, the maximum network throughput is obtained as much as possible, and the communication rate of the equipment can be further improved; the method has the advantages of expanding the number of serial ports, reducing communication interference, saving cost and the like, and is wide in application range.
The principles and embodiments of the present invention have been described with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In summary, the present description should not be construed as limiting the invention.
Claims (2)
1. A serial port expansion system based on a multipath packet scheduling algorithm comprises a PC end and terminal equipment, and is characterized in that: the PC end is connected with the terminal equipment through an MCU expansion device;
the MCU expansion device comprises an MCU unit which is respectively connected with the PC end and the terminal equipment, and is also connected with a multiplexing selector unit, an SRAM unit and a FLASH unit, wherein the multiplexing selector unit is connected with the terminal equipment;
The MCU unit adopts a CC2538 series singlechip; the CC2538 serial single chip microcomputer is also externally connected with an SRAM unit, the data is stored on the SRAM unit in real time, the function of buffering uplink and downlink data is achieved, and the data can be processed and transmitted successively according to the priority of the data;
The multiplexing selector unit adopts TMUX1209 series multiplexing selector;
the packet scheduling method of the multiplexing selector unit includes the steps of:
(1) Each 4 terminal devices are organized into a serial port of a group of butt joint MCU units;
(2) The MCU unit is used for controlling the multiplexing selector unit to select a first terminal device in a group of terminal devices to start data interaction;
(3) The time counter of the MCU unit is accumulated, and when the time counter is overtime, the MCU unit starts data interaction by controlling the multiplexing selector unit to select the next terminal device in a group of terminal devices:
(4) And when the data transmission of each section is finished, the counter of the terminal equipment is accumulated, and when the counter of the terminal equipment is accumulated to 4, the counter of the terminal equipment is set to 1 and the time counter of the MCU unit is set to 0.
2. The serial port expansion system based on the multi-path packet scheduling algorithm according to claim 1, wherein: the terminal equipment is a WiFi module, a WiFi chip or an application terminal WiFi data collector.
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