CN113127394A - Data time-sharing sending method, system and storage medium - Google Patents
Data time-sharing sending method, system and storage medium Download PDFInfo
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- CN113127394A CN113127394A CN202110294248.3A CN202110294248A CN113127394A CN 113127394 A CN113127394 A CN 113127394A CN 202110294248 A CN202110294248 A CN 202110294248A CN 113127394 A CN113127394 A CN 113127394A
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- 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
- G06F13/387—Information transfer, e.g. on bus using universal interface adapter for adaptation of different data processing systems to different peripheral devices, e.g. protocol converters for incompatible systems, open system
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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
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract
The invention discloses a data time-sharing sending method, a system and a storage medium, wherein the method comprises the following steps: the Tx line of the master device sends a ready signal to all the slave devices at intervals of a preset period; each slave device starts timing when receiving a ready signal sent by the master device from a corresponding Rx line, after a preset time, a Tx line of a first slave device sends data to the master device, 2 × after the preset time, a Tx line of a second slave device sends data to the master device, and 3 × after the preset time, a Tx line of a third slave device sends data to the master device. The invention reasonably distributes the time for sending the data from the slave equipment, so that the slave equipment staggers the time points for sending the data, and avoids sending the data to the master equipment at the same time, thereby ensuring that all the slave equipment can correctly send the data to the master equipment.
Description
Technical Field
The invention relates to the technical field of serial port communication, in particular to a data time-sharing sending method, a data time-sharing sending system and a storage medium.
Background
The serial port is a data input/output interface equipped for the embedded device (hereinafter referred to as device), and has the advantages of simple design, low cost and stable work. The serial communication line is very simple, and only one pair of transmission lines can realize bidirectional communication (for example, telephone lines can be directly used as the transmission lines), so that the cost is greatly reduced.
The pair of transmission lines includes an Rx line (Receive) for receiving data and a Tx line (Transport) for transmitting data; the serial port is suitable for a point-to-point communication mode, wherein the connection mode is that an Rx line at a point A is connected with a Tx line at a point B, and the Tx line at the point A is connected with an Rx line at the point B. Serial ports are not suitable for multicast scenarios (multicast: there are three or more endpoints participating in communication), because multicast means that at least two or more Tx lines are connected in parallel, and these multiple Tx lines connected in parallel interfere with each other and collide with each other if they transmit data at the same time.
For example, in a master-slave communication system, there are a plurality of slave devices and a master device, and the slave devices and the master device communicate with each other and the slave devices do not communicate with each other. The Rx lines of the master device are connected to the Tx lines of all the slave devices (the Tx lines of the slave devices are connected in parallel), and the Tx lines of the master device are connected to the Rx lines of all the slave devices (the Rx lines of the slave devices are connected in parallel).
If the Tx lines of multiple slaves transmit data to the master at the same time, the data will interfere with each other and collide with each other, and the master cannot read correct data from the Rx line of the master, for example, the Tx1 line and the Tx2 line of two slaves, Tx1 transmits signal 0 and Tx2 transmits signal 1, and from the Rx line of the receiving end (i.e., the master), it is impossible to distinguish whether Tx1 transmits signal 0 or signal 1, and it is impossible to distinguish whether Tx2 transmits signal 0 or signal 1.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The invention mainly aims to provide a data time-sharing sending method, a data time-sharing sending system and a storage medium, and aims to solve the problem that in the prior art, when a plurality of slave devices send data to a master device at the same time, interference conflict occurs, and therefore the master device cannot read correct data.
In order to achieve the above object, the present invention provides a data time-sharing transmission method, which is applied to a data time-sharing transmission system, wherein the data time-sharing transmission system comprises: a master device, a plurality of slave devices connected to the master device; the Rx lines of the master device are connected with the Tx lines of all the slave devices, and the Tx lines of all the slave devices are connected in parallel; the Tx line of the master device is connected with the Rx lines of all the slave devices, and the Rx lines of all the slave devices are connected in parallel; the data time-sharing sending method comprises the following steps:
the Tx line of the master device sends a ready signal to all the slave devices at intervals of a preset period;
each slave device starts timing when receiving a ready signal sent by the master device from a corresponding Rx line, after a preset time, a Tx line of a first slave device sends data to the master device, 2 × after the preset time, a Tx line of a second slave device sends data to the master device, and 3 × after the preset time, a Tx line of a third slave device sends data to the master device.
Optionally, the data time-sharing transmission method, wherein the Tx line of the master device sends a ready signal to all the slave devices every preset period, and before the sending, the method further includes:
numbering a plurality of slave devices in sequence in advance, wherein the slave devices are named as a first slave device, a second slave device, and an nth slave device respectively; wherein n is a positive integer.
Optionally, the data time-sharing transmission method includes that the ready signal is used to notify all slave devices to prepare to transmit data to the master device, and all slave devices enter a preparation state of preparing to transmit data to the master device after receiving the ready signal at the same time.
Optionally, the data time-sharing transmission method is that the preset time is set according to the size of data sent by the slave device each time, and the preset time is used to ensure that the data sent by the slave device each time is sent within the preset time.
Optionally, the data time-sharing transmission method is that a duration of each slave device transmitting data each time is less than the preset time.
Optionally, the data time-sharing transmission method may allow at most a preset period/preset time of the slave devices to transmit data to the master device.
Optionally, the data time-sharing transmission method is implemented, where the preset period is 10 seconds.
Optionally, the data time-sharing transmission method is that the preset time is 0.5 second.
In addition, to achieve the above object, the present invention further provides a data time-sharing transmission system, wherein the data time-sharing transmission system includes:
a master device, a plurality of slave devices connected to the master device;
the Rx lines of the master device are connected with the Tx lines of all the slave devices, and the Tx lines of all the slave devices are connected in parallel;
the Tx line of the master device is connected with the Rx lines of all the slave devices, and the Rx lines of all the slave devices are connected in parallel;
the Tx line of the master device sends a ready signal to all slave devices every other preset period;
each slave device starts timing when receiving a ready signal sent by the master device from a corresponding Rx line, after a preset time, a Tx line of a first slave device sends data to the master device, 2 × after the preset time, a Tx line of a second slave device sends data to the master device, 3 × after the preset time, a Tx line of a third slave device sends data to the master device, and.
In order to achieve the above object, the present invention further provides a storage medium, wherein the storage medium stores a data time-sharing transmission program, and the data time-sharing transmission program implements the steps of the data time-sharing transmission method when executed by a processor.
The method comprises the steps that a ready signal is sent to all slave devices every other preset period through a Tx line of a master device; each slave device starts timing when receiving a ready signal sent by the master device from a corresponding Rx line, after a preset time, a Tx line of a first slave device sends data to the master device, 2 × after the preset time, a Tx line of a second slave device sends data to the master device, and 3 × after the preset time, a Tx line of a third slave device sends data to the master device. The invention reasonably distributes the time for sending the data from the slave equipment, so that the slave equipment staggers the time points for sending the data, and avoids sending the data to the master equipment at the same time, thereby ensuring that all the slave equipment can correctly send the data to the master equipment.
Drawings
FIG. 1 is a flow chart of a preferred embodiment of a method for time-sharing transmission of data according to the present invention;
fig. 2 is a schematic diagram of a data time-sharing transmission system according to a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the data time-sharing transmission method according to the preferred embodiment of the present invention is applied to a data time-sharing transmission system, and as shown in fig. 2, the data time-sharing transmission system includes: a master device, a plurality of slave devices connected to the master device; the Rx lines of the master device are connected with the Tx lines of all the slave devices, and the Tx lines of all the slave devices are connected in parallel; the Tx line of the master device is connected with the Rx lines of all the slave devices, and the Rx lines of all the slave devices are connected in parallel; the data time-sharing sending method comprises the following steps:
step S10, the Tx line of the master device sends a ready signal to all the slave devices every preset period;
step S20, each slave device starts timing when receiving a ready signal sent by the master device from its corresponding Rx line, after a preset time, the Tx line of the first slave device sends data to the master device, 2 × the Tx line of the second slave device sends data to the master device after the preset time, 3 × the Tx line of the third slave device sends data to the master device, and n × the Tx line of the nth slave device sends data to the master device after the preset time.
Specifically, the method further includes, before the step S10: numbering a plurality of slave devices in sequence in advance, wherein the slave devices are named as a first slave device, a second slave device, and an nth slave device respectively; wherein n is a positive integer. For example, if there are 20 slave devices, then 20 of the slave devices are numbered sequentially, named first slave device (or slave device 1), second slave device (or slave device 2),.., twentieth slave device (or slave device 20), respectively.
The ready signal is used for informing all slave devices to send data to the master device, and all slave devices enter a ready state of sending data to the master device after receiving the ready signal simultaneously. That is, the master device informs all slave devices that data can be ready to be sent to the master device through the ready signal, but instead of controlling multiple slave devices to send data to the master device at the same time, each slave device waits for different (the waiting time interval may be the same) times to send data again, so that interference collision caused by sending data at the same time is avoided.
The preset period (T) is set according to how often the slave device sends data to the master device, for example, if the slave device is a temperature sensor and sends a temperature value to the master device every 10 seconds, the preset period (T) is equal to 10 seconds.
The preset time (S) is set according to the size of the data sent by the slave equipment each time, and the preset time is used for ensuring that the data sent by the slave equipment each time is sent within the preset time. That is, it is necessary to ensure that each transmission data can be transmitted in S seconds, for example, S takes 0.5 second, depending on the size of the data volume transmitted by the slave device each time.
Wherein the time length of each slave device for transmitting data each time is less than the preset time (S); in addition, in the invention, the slave devices with the preset period/preset time (namely T/S) are allowed to send data to the master device at most, because the ready signal is sent once every T seconds, after all the slave devices receive the ready signal, the slave devices 1 and 2 sequentially send data every S seconds, and only the T/S slave devices are allowed to send data within the T seconds, even if more than T/S slave devices exist, the slave devices with the numbers exceeding the T/S do not have the opportunity of sending data. For example, when T is 10 seconds and S is 0.5 seconds, the preset period/preset time (T/S) is 10/0.5 is 20, that is, in the present invention, a maximum of 20 slave devices are allowed to transmit data to the master device; in addition, the values of T and S can be adjusted according to the number of slave devices.
For example, when T is 10 seconds and S is 0.5 seconds, the master Tx line sends a ready signal to the slaves every period T (10 seconds), and all slaves can correctly receive the ready signal. Each slave device starts timing after receiving a ready signal sent by the master device from an Rx line, Tx of the slave device 1 sends data to the master device after S seconds (0.5 seconds), Tx of the slave device 2 sends data to the master device after 2S seconds (1 second), Tx of the slave device 3 sends data to the master device after 3S seconds (1.5 seconds), and Tx of the slave device n sends data to the master device after n S seconds, wherein the time length of each slave device sending data is less than S seconds.
The master device waits and receives data sent by one slave device, and if the time length from the last sending of the ready signal does not exceed T seconds, the master device continues to wait and receive data sent by the next slave device; if the time length from the last sending of the ready signal is equal to or exceeds T seconds, the master Tx line immediately resends the ready signal to the slave.
The invention provides a method for reasonably distributing the time for sending data by slave equipment, which leads the slave equipment to stagger the time points for sending data and avoids sending data to the master equipment at the same time, thereby leading all the slave equipment to be capable of correctly sending data to the master equipment.
Further, as shown in fig. 2, the data time-sharing transmission system includes:
a master device, a plurality of slave devices (e.g., slave device 1, slave device 2, slave device 3) connected to the master device; the Rx lines of the master device are connected with the Tx lines of all the slave devices, and the Tx lines of all the slave devices are connected in parallel; the Tx lines of the master device are connected to the Rx lines of all the slave devices, and the Rx lines of all the slave devices are connected in parallel.
The Tx line of the master device sends a ready signal to all slave devices every other preset period; each slave device starts timing when receiving a ready signal sent by the master device from a corresponding Rx line, after a preset time, a Tx line of a first slave device sends data to the master device, 2 × after the preset time, a Tx line of a second slave device sends data to the master device, 3 × after the preset time, a Tx line of a third slave device sends data to the master device, and.
The slave devices are numbered in sequence in advance and named as a first slave device, a second slave device, and an nth slave device; wherein n is a positive integer.
The ready signal is used for informing all slave devices to send data to the master device, and all slave devices enter a ready state of sending data to the master device after receiving the ready signal simultaneously.
The preset time is set according to the size of the data sent by the slave device each time, and the preset time is used for ensuring that the data sent by the slave device each time is sent within the preset time.
And each slave device sends data each time, wherein the duration of each slave device sending data is less than the preset time.
And transmitting data to the master device by the slave devices at most in preset period/preset time.
Wherein the preset period is 10 seconds.
Wherein the preset time is 0.5 second.
Further, the present invention also provides a storage medium, wherein the storage medium stores a data time-sharing transmission program, and the data time-sharing transmission program implements the steps of the data time-sharing transmission method when executed by a processor.
In summary, the present invention provides a data time-sharing transmission method, system and storage medium, where the method includes: the Tx line of the master device sends a ready signal to all the slave devices at intervals of a preset period; each slave device starts timing when receiving a ready signal sent by the master device from a corresponding Rx line, after a preset time, a Tx line of a first slave device sends data to the master device, 2 × after the preset time, a Tx line of a second slave device sends data to the master device, and 3 × after the preset time, a Tx line of a third slave device sends data to the master device. The invention reasonably distributes the time for sending the data from the slave equipment, so that the slave equipment staggers the time points for sending the data, and avoids sending the data to the master equipment at the same time, thereby ensuring that all the slave equipment can correctly send the data to the master equipment.
Of course, it will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by a computer program instructing relevant hardware (such as a processor, a controller, etc.), and the program may be stored in a computer readable storage medium, and when executed, the program may include the processes of the above method embodiments. The storage medium may be a memory, a magnetic disk, an optical disk, etc.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. A data time-sharing sending method is applied to a data time-sharing sending system, and the data time-sharing sending system comprises: a master device, a plurality of slave devices connected to the master device; the Rx lines of the master device are connected with the Tx lines of all the slave devices, and the Tx lines of all the slave devices are connected in parallel; the Tx line of the master device is connected with the Rx lines of all the slave devices, and the Rx lines of all the slave devices are connected in parallel; the data time-sharing sending method is characterized by comprising the following steps:
the Tx line of the master device sends a ready signal to all the slave devices at intervals of a preset period;
each slave device starts timing when receiving a ready signal sent by the master device from a corresponding Rx line, after a preset time, a Tx line of a first slave device sends data to the master device, 2 × after the preset time, a Tx line of a second slave device sends data to the master device, and 3 × after the preset time, a Tx line of a third slave device sends data to the master device.
2. The data time-sharing transmission method according to claim 1, wherein the Tx line of the master device transmits a ready signal to all the slave devices every preset period, and before further comprising:
numbering a plurality of slave devices in sequence in advance, wherein the slave devices are named as a first slave device, a second slave device, and an nth slave device respectively; wherein n is a positive integer.
3. The data time-sharing transmission method according to claim 1, wherein the ready signal is used to notify all slave devices that data is ready to be transmitted to the master device, and all slave devices enter a ready state ready to transmit data to the master device after receiving the ready signal at the same time.
4. The data time-sharing transmission method according to claim 1, wherein the preset time is set according to a size of data sent by the slave device each time, and the preset time is used to ensure that the data sent by the slave device each time is sent within the preset time.
5. The data time-sharing transmission method according to claim 4, wherein a time duration of each time when each slave device transmits data is less than the preset time.
6. The data time-sharing transmission method according to claim 1, wherein a preset period/preset time is allowed at most for a plurality of slave devices to transmit data to the master device.
7. The data time-sharing transmission method according to claim 1, wherein the preset period is 10 seconds.
8. The data time-sharing transmission method according to claim 1, wherein the preset time is 0.5 seconds.
9. A data time-sharing transmission system, characterized in that the data time-sharing transmission system comprises:
a master device, a plurality of slave devices connected to the master device;
the Rx lines of the master device are connected with the Tx lines of all the slave devices, and the Tx lines of all the slave devices are connected in parallel;
the Tx line of the master device is connected with the Rx lines of all the slave devices, and the Rx lines of all the slave devices are connected in parallel;
the Tx line of the master device sends a ready signal to all slave devices every other preset period;
each slave device starts timing when receiving a ready signal sent by the master device from a corresponding Rx line, after a preset time, a Tx line of a first slave device sends data to the master device, 2 × after the preset time, a Tx line of a second slave device sends data to the master device, 3 × after the preset time, a Tx line of a third slave device sends data to the master device, and.
10. A storage medium storing a data time-sharing transmission program that realizes the steps of the data time-sharing transmission method according to any one of claims 1 to 8 when executed by a processor.
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