CN108614789B - Communication system and method of serial port bus with handshake mechanism - Google Patents
Communication system and method of serial port bus with handshake mechanism Download PDFInfo
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- CN108614789B CN108614789B CN201810304727.7A CN201810304727A CN108614789B CN 108614789 B CN108614789 B CN 108614789B CN 201810304727 A CN201810304727 A CN 201810304727A CN 108614789 B CN108614789 B CN 108614789B
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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
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
- G06F13/4286—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus using a handshaking protocol, e.g. RS232C link
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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
Abstract
The invention discloses a serial port bus communication method with a handshake mechanism, which comprises the following steps: firstly, the master device is connected with all the slave devices through data receiving and transmitting lines respectively, and each slave device is connected with other slave devices through handshake signal lines; secondly, the master device directly sends instruction data with address codes to the slave device through a data receiving and sending line; and thirdly, the slave device monitors the handshake signals on the handshake signal line and sends data to the master device through the data transceiving line according to the handshake signals. The invention overcomes the defect that the number of the serial ports of the master device is limited, the serial ports of the master device can be connected with the serial ports of a plurality of slave devices, and the slave devices are connected through handshake signal lines, thereby realizing one-to-many and many-to-one ordered communication between the master device and the plurality of slave devices. The data uploading congestion and even errors caused by directly connecting a plurality of slave devices in series on the communication line of the master device in the traditional mode are avoided, and the data transmission efficiency of the system is improved.
Description
Technical Field
The invention relates to the technical field of industrial automation control, in particular to a communication method of an industrial control system comprising a master device and a plurality of slave devices.
Background
The high speed real time network communication protocol is a bus technology with proprietary property rights of the panasonic company. A high-speed implementation network communication protocol based on 100Mbps adopts a ring topology structure, each node including an upper main control device and a plurality of slave devices connected with the main control device is provided with an outlet (Tx) and an inlet (Rx), namely a data output port and a data input port, a data output serial port between the main device and the plurality of slave devices is connected through a Tx line, and a data input serial port between the main device and the plurality of slave devices is connected through an Rx line. The high-speed real-time network communication protocol realizes the high-precision real-time performance of servo control and has the advantages of high performance, low cost, high reliability and easy realization.
In the prior art, a serial port of a device cannot be used as a bus, and only one-to-one transmission can be performed between two devices. However, the number of serial ports of the master device is limited, and in some applications, such as the robot industry, the master device needs to connect a plurality of slave devices through serial ports, so that a plurality of slave devices have to be connected in series in a serial port channel, and the serial port channel is connected to the master device as a serial port bus application. However, cascading multiple slaves on a communication line can cause congestion and even errors in the uploaded data, and can potentially cause the entire system to crash.
Accordingly, the prior art is deficient and needs improvement.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a serial port bus communication method with a handshake mechanism.
The technical scheme of the invention is as follows: a serial port bus communication method with a handshake mechanism comprises the following steps:
s1: the master equipment is connected with all the slave equipment through data receiving and transmitting lines respectively, and each slave equipment is connected with other slave equipment through a handshake signal line;
s2: the master equipment directly sends instruction data with address codes to the slave equipment through a data receiving and sending line;
s3: the slave device monitors a handshake signal on a handshake signal line and sends data to the master device through a data transceiving line according to the handshake signal;
further, the process of the master device sending the instruction to the target slave device in step S2 includes the following steps:
s201: the master device sends data containing address codes and instructions of target slave devices to all connected slave devices;
s202: the slave equipment receives data which is sent by the master equipment and contains a target slave equipment address code and an instruction, analyzes the address code from the data and checks the address code with the self address code;
s203: the slave device whose own address code is consistent with the address code of the target slave device executes the instruction in the data, and the slave devices whose other address codes are not consistent do not execute the instruction in the data.
Further, the process of the slave device sending data to the master device in step S3 includes the following steps:
s301: each slave device monitors a handshake signal on a handshake signal line;
s302: when a slave device monitors that no handshake signal exists on a handshake signal line, the slave device firstly sends a handshake signal to the handshake signal line, and then sends data to the master device through a data transceiver, and after the data is sent, the slave device clears the handshake signal on the handshake signal line;
s303: when other slave devices monitor that there is a handshake signal on the handshake signal line, the slave device does not send data to the master device, and queues up and monitors the handshake signal on the handshake signal line until it monitors that there is no handshake signal on the handshake signal line, and the slave device sends data to the master device through step S302.
Further, the master device randomly generates an address code of a slave device connected with the master device through a master control chip; the slave device analyzes the address code from the data which is sent by the master device and contains the address code and the instruction of the target slave device through the singlechip, and checks the address code with the address code of the slave device.
Furthermore, the master device is connected with the slave device through a serial communication protocol, wherein the serial communication protocol is RS-232, RS-422, RS-485 or TTLUA RT.
Further, the data transceiving line connection between the serial ports of the master device and the slave device comprises a Tx line and an Rx line.
Further, handshake signal lines are connected between the slave devices through GPIO ports.
Furthermore, the slave device sends a handshake signal by sending a high-level signal to the handshake signal line, and after the slave device sends data to the master device through the signal transceiving line, the handshake signal is eliminated by sending a low-level signal to the handshake signal line.
By adopting the scheme, the serial port of the master device can be connected with the serial ports of the plurality of slave devices, and the slave devices are connected through the handshaking signal lines, so that one-to-many and many-to-one ordered communication between the master device and the plurality of slave devices is realized. The data uploading congestion and even errors caused by directly connecting a plurality of slave devices in series on the communication line of the master device in the traditional mode are avoided, and the data transmission efficiency of the system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of the system architecture of the invention;
FIG. 2 is a schematic diagram of a process for a master device to send data to a slave device;
fig. 3 is a schematic flow chart of data transmission from the slave device to the master device.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
Referring to fig. 1 to 3, the present invention provides a serial bus communication method with a handshake mechanism, for implementing efficient and convenient communication between a master device and a plurality of slave devices, the method includes the following steps:
s1: the master equipment is connected with all the slave equipment through data receiving and transmitting lines respectively, and each slave equipment is connected with other slave equipment through a handshake signal line;
s2: the master equipment directly sends instruction data with address codes to the slave equipment through a data receiving and sending line;
s3: the slave device monitors a handshake signal on a handshake signal line and sends data to the master device through a data transceiving line according to the handshake signal;
the process of sending the instruction from the master device to the target slave device in step S2 includes the following steps:
s201: the master device sends data containing address codes and instructions of target slave devices to all connected slave devices;
s202: the slave equipment receives data which is sent by the master equipment and contains a target slave equipment address code and an instruction, analyzes the address code from the data and checks the address code with the self address code;
s203: the slave device whose own address code is consistent with the address code of the target slave device executes the instruction in the data, and the slave devices whose other address codes are not consistent do not execute the instruction in the data.
The master device may generate an address code of the slave device in a plurality of ways, and as an embodiment, the master device randomly generates an address code of the slave device connected to the master device through the master control chip; the slave equipment also analyzes the address code from the data which is sent by the master equipment and contains the address code and the instruction of the target slave equipment through the singlechip, and checks the address code with the address code of the slave equipment. In this embodiment, the main control chip in the master device adopts a model of fully intelligent a64, and the single chip microcomputer in the slave device adopts a model of STM32F030C8T 6.
The master device and the slave device are connected through a serial communication protocol, the serial communication protocol can be RS-232, RS-422, RS-485 or TTLUA RT and the like, and a TTLUA RT communication serial port is adopted in the embodiment. The data receiving and transmitting line connection between the serial ports of the master device and the slave device comprises a Tx line and an Rx line, wherein the Tx line is a data transmitting line, and the Rx line is a signal receiving line.
The process of the slave device transmitting data to the master device in step S3 includes the steps of:
s301: each slave device monitors a handshake signal on a handshake signal line;
s302: when a slave device monitors that no handshake signal exists on a handshake signal line, the slave device firstly sends a handshake signal to the handshake signal line, and then sends data to the master device through a data transceiver, and after the data is sent, the slave device clears the handshake signal on the handshake signal line;
s303: when other slave devices monitor that there is a handshake signal on the handshake signal line, the slave device does not send data to the master device, and queues up and monitors the handshake signal on the handshake signal line until it monitors that there is no handshake signal on the handshake signal line, and the slave device sends data to the master device through step S302.
In this embodiment, the slave device sends the handshake signal by sending a high-level signal to the handshake signal line, and after the slave device sends data to the master device by the signal transceiver line, the handshake signal is eliminated by sending a low-level signal to the handshake signal line. Specifically, handshake signal lines are connected between the slave devices through GPIO ports, and the GPIO ports are respectively connected with a single chip microcomputer of the slave devices.
When a slave device needs to send data to the master device, the single chip microcomputer of the slave device monitors a level signal on a handshake signal line connected with the GPIO port. When the slave device listens that the level signal on the handshake signal line is high level, that is, the handshake signal is on the handshake signal line, the slave device does not send data to the master device. The slave device queues up for the level on the handshake signal line to transition to a low level, i.e. the handshake signal on the handshake signal line disappears.
When the slave device monitors that the level signal on the handshake signal line is low level, namely no handshake signal exists on the handshake signal line, the slave device firstly sends a handshake signal to the handshake signal line, and the slave device singlechip sends high level to the handshake signal line through the GPIO port; and secondly, the slave device sends data to the master device through the data transceiver line, and after the data is sent, the single chip microcomputer of the slave device sends low level to the handshake signal line through the GPIO port, so that the handshake signal on the handshake signal line is eliminated, and the signal transmission of the slave device is completed. And if the other slave equipment needs to send data to the master equipment, the other slave equipment sends the data to the master equipment according to the priority of the preemption speed after the handshake signals on the handshake signal lines are eliminated. Similarly, the slave device may send the handshake signals in a manner of sending a low level to the handshake signal lines, and may eliminate the handshake signals in a manner of sending a high level to the handshake signal lines.
The invention overcomes the defect that the number of the serial ports of the master device is limited, the serial ports of the master device can be connected with the serial ports of a plurality of slave devices, and the slave devices are connected through handshake signal lines, thereby realizing one-to-many and many-to-one ordered communication between the master device and the plurality of slave devices. The data uploading congestion and even errors caused by directly connecting a plurality of slave devices in series on the communication line of the master device in the traditional mode are avoided, and the data transmission efficiency of the system is improved.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A serial port bus communication method with a handshake mechanism is characterized by comprising the following steps:
sl: the master equipment is connected with all the slave equipment through data receiving and transmitting lines respectively, and each slave equipment is connected with other slave equipment through a handshake signal line;
s2: the master equipment directly sends instruction data with address codes to the slave equipment through a data receiving and sending line;
s3: the slave device monitors a handshake signal on a handshake signal line and sends data to the master device through a data transceiving line according to the handshake signal;
in step S3, the process of sending data from the slave device to the master device includes the following steps:
s301: each slave device monitors a handshake signal on a handshake signal line;
s302: when a slave device monitors that no handshake signal exists on a handshake signal line, the slave device firstly sends a handshake signal to the handshake signal line, and then sends data to the master device through a data transceiver, and after the data is sent, the slave device clears the handshake signal on the handshake signal line;
s303: when other slave devices monitor that there is a handshake signal on the handshake signal line, the slave device does not send data to the master device, and queues up and monitors the handshake signal on the handshake signal line until it monitors that there is no handshake signal on the handshake signal line, and the slave device sends data to the master device through step S302.
2. The serial bus communication method with handshake mechanism according to claim 1, wherein the process of the master device sending the command to the target slave device in step S2 includes the following steps:
s201: the master device sends data containing address codes and instructions of target slave devices to all connected slave devices;
s202: the slave equipment receives data which is sent by the master equipment and contains a target slave equipment address code and an instruction, analyzes the address code from the data and checks the address code with the self address code;
s203: the slave device whose own address code is consistent with the address code of the target slave device executes the instruction in the data, and the slave devices whose other address codes are not consistent do not execute the instruction in the data.
3. The serial port bus communication method with the handshake mechanism according to claim 2, wherein the master device randomly generates an address code of a slave device connected with the master device through a master control chip; the slave device analyzes the address code from the data which is sent by the master device and contains the address code and the instruction of the target slave device through the singlechip, and checks the address code with the address code of the slave device.
4. The serial bus communication method with the handshake mechanism according to claim 1, wherein the master device and the slave device are connected through a serial communication protocol, and the serial communication protocol is RS-232, RS-422, RS-485, or TTLUA RT.
5. The serial bus communication method with handshake mechanism as claimed in claim 4, wherein the data transceiving line connection between the serial ports of the master device and the slave device includes Tx line and Rx line.
6. The serial bus communication method with the handshake mechanism according to claim 1, wherein handshake signal lines are connected between the slave devices through GPIO ports.
7. The serial bus communication method with handshake mechanism according to claim 1, wherein the slave device sends the handshake signals by sending high-level signals to the handshake signal lines, and after the slave device sends data to the master device through the signal transceiver lines, the handshake signals are eliminated by sending low-level signals to the handshake signal lines.
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| CN109616156B (en) * | 2018-12-03 | 2021-07-06 | 郑州云海信息技术有限公司 | Gene sequencing data storage method and device |
| CN110209617A (en) * | 2019-05-10 | 2019-09-06 | 中国电力科学研究院有限公司 | A kind of UART serial ports Transistor-Transistor Logic level communicates two-way physics monitoring system and method |
| CN112134771B (en) * | 2019-06-25 | 2022-03-29 | 青岛海尔电冰箱有限公司 | Half-duplex communication method for refrigerator and refrigerator |
| CN113127394A (en) * | 2021-03-19 | 2021-07-16 | 深圳震有科技股份有限公司 | Data time-sharing sending method, system and storage medium |
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| CN1622069A (en) * | 2004-12-31 | 2005-06-01 | 北京中星微电子有限公司 | Apparatus for realizing access of driven devices on a unified bus by a plurality of active devices |
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