CN112699076A - Serial communication method, device and system - Google Patents
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Abstract
The application discloses a serial communication method, a serial communication device and a serial communication system. Wherein, carry on the data synchronization line, data sending line and data receiving line among the apparatus that the serial communication carries on, the serial communication method includes: determining a communication state according to the level state of the data synchronization line; under the condition that the communication state is a data transmission state, sending a first number of jumping edges through a data sending line so that opposite terminal equipment translates the received number of jumping edges into data expected to be sent by the equipment; and/or receiving a second number of hopping edges through a data receiving line, and translating the received hopping edge number into data expected to be sent by the opposite terminal equipment. The technical scheme has the advantages that the control of the communication state is realized by using the data synchronization line, and the baud rate of a communication clock or the time interval of data acquisition is not required to be limited; a data transmission mode with the number of jumping edges is utilized to replace a level transmission mode in the prior art, interference resistance is easy to achieve, and data transmission is stable.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a serial communication method, apparatus, and system.
Background
The serial communication technology is a communication method in which both communication parties perform bit-by-bit and follow a time sequence. In serial communication, data are transmitted in order according to bits, each bit of data occupies a fixed time length, information exchange among systems can be completed by using a few communication lines, and the method is particularly suitable for remote communication between computers and peripheral equipment.
The serial communication is classified into synchronous serial communication and asynchronous serial communication. The synchronous communication is a communication mode for continuously and serially transmitting data, and has the disadvantages that a sending clock and a receiving clock are required to be strictly synchronous, once transmission is started, the baud rate of a clock line cannot be changed, and communication cannot be suspended.
In asynchronous communication, a sending end and a receiving end can control sending and receiving of data through respective clocks, the two clock sources are independent and not synchronous, but both communication parties need to solidify a same baud rate, data are acquired through a fixed time interval, and errors can occur in data transmission if the time interval is missed.
Disclosure of Invention
The embodiment of the application provides a serial communication method, a serial communication device and a serial communication system, the baud rate of a clock does not need to be solidified, the anti-interference performance is stronger, and the data transmission is more stable.
The embodiment of the application adopts the following technical scheme:
in a first aspect, an embodiment of the present application provides a serial communication method, where a data synchronization line, a data transmission line, and a data reception line are connected between devices performing serial communication, the method including: determining a communication state according to the level state of the data synchronization line; under the condition that the communication state is a data transmission state, sending a first number of jumping edges through a data sending line so that opposite terminal equipment translates the received number of jumping edges into data expected to be sent by the equipment; and/or receiving a second number of hopping edges through a data receiving line, and translating the received hopping edge number into data expected to be sent by the opposite terminal equipment.
In some embodiments, translating comprises: converting the number of the received jump edges into a numerical value of a preset system; or, performing preset linear operation and/or nonlinear operation on the received number of the jumping edges, and converting the operation result into a numerical value of a preset system.
In some embodiments, the data amount of data expected to be transmitted is 4 bits.
In some embodiments, the number of transition edges is counted as follows: if the communication state is changed from the idle state to the data transmission state, counting the number of jumping edges; and if the communication state is changed from the data transmission state to the idle state, stopping counting the number of the jumping edges and obtaining a counting result of the number of the jumping edges.
In some embodiments, the device performing serial communication is divided into a master device and a slave device by role, the method is performed by the master device, and the method further comprises: determining a starting time point of communication according to data expected to be sent by the equipment; at the start time point, the level state of the data synchronization line is changed so that the communication state is changed to the data transmission state.
In some embodiments, the serial communication method further comprises: and after the first number of jumping edges are sent, changing the level state of the data synchronization line so as to change the communication state into an idle state.
In some embodiments, the serial communication method further comprises: and merging the data obtained by the translation for a plurality of times according to a predefined data format.
In some embodiments, merging the data resulting from the several translations includes: the data translated first is used as low-order data, and the data translated later is used as high-order data.
In a second aspect, an embodiment of the present application further provides a serial communication apparatus, which is used for implementing the serial communication method as described in any one of the above.
In a third aspect, an embodiment of the present application further provides a serial communication system, including a host device and a slave device, where a data synchronization line, a data transmission line, and a data reception line are connected between the host device and the slave device; the master device is used for controlling the level state of the data synchronization line so as to control the communication state between the master device and the slave device; the host equipment is used for sending a first number of jumping edges through a data sending line under the condition that the communication state is a data transmission state; and/or receiving a second number of hopping edges through a data receiving line, and translating the received number of hopping edges into data expected to be sent by the slave equipment; the slave equipment is used for sending a second number of jumping edges through the data receiving line under the condition that the communication state is the data transmission state; and/or receiving a first number of transition edges through the data receiving line, and translating the received number of transition edges into data expected to be transmitted by the host device.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects: the serial communication is realized based on the data synchronization line, the data sending line and the data receiving line, the control of the communication state is realized by using the data synchronization line, and the baud rate of a communication clock or the time interval of data acquisition is not required to be limited; a data transmission mode with the number of jumping edges is utilized to replace a level transmission mode in the prior art, interference resistance is easy to achieve, and data transmission is stable.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 illustrates a flow diagram of a method of serial communication according to one embodiment of the present application;
FIG. 2 illustrates a timing diagram of level states for serial communication between a master device and a slave device according to one embodiment of the present application;
FIG. 3 illustrates a schematic diagram of a serial communication device according to an embodiment of the present application;
fig. 4 shows a schematic diagram of a serial communication system according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a flow chart illustrating a serial communication method according to an embodiment of the present application, in which a data synchronization line, a data transmission line, and a data reception line are connected between devices performing serial communication.
As shown in fig. 1, the method includes:
in step S110, a communication state is determined according to the level state of the data synchronization line.
In the embodiment of the present application, a clock line used in the prior art is replaced with a data synchronization line (SYNC), so that the baud rate of a communication clock or the time interval of data acquisition does not need to be limited.
The level state of the Data synchronization line may correspond to a communication state, for example, if the Data synchronization line is In a high level state, the communication state is an idle state, and Data transmission is not performed through the Data transmission line (Data Out) and the Data reception line (Data In); when the data synchronization line is in a low level state, the communication state is a data transmission state, and data transmission can be performed through the data transmission line and the data reception line.
Step S120, under the condition that the communication state is the data transmission state, a first number of jumping edges are sent through a data sending line, so that the opposite terminal equipment translates the received number of jumping edges into data expected to be sent by the equipment; and/or receiving a second number of hopping edges through a data receiving line, and translating the received hopping edge number into data expected to be sent by the opposite terminal equipment.
In the embodiment of the application, data transmission in one direction is carried out through the data sending line and the data receiving line respectively, and a level transmission mode in the prior art is replaced by a data transmission mode of counting the number of jumping edges, so that the interference resistance is easier, and the data transmission is more stable.
It can be seen that, in the method shown in fig. 1, serial communication is implemented based on the data synchronization line, the data transmission line and the data reception line, and the control of the communication state is implemented by using the data synchronization line without limiting the baud rate of the communication clock or the time interval of data acquisition; a data transmission mode with the number of jumping edges is utilized to replace a level transmission mode in the prior art, interference resistance is easy to achieve, and data transmission is stable.
In some embodiments, in the above method, the translating comprises: converting the number of the received jump edges into a numerical value of a preset system; or, performing preset linear operation and/or nonlinear operation on the received number of the jumping edges, and converting the operation result into a numerical value of a preset system.
For example, the data expected to be transmitted is binary 00001111 (or hexadecimal 0F), with a corresponding decimal value of 15. The host may send 15 transition edges to the data transmit line when the data sync line is low. Or, the host sends N jumping edges to the data sending line, and calculates to obtain 15 by using linear operation (such as adding or subtracting a constant) between N and 15, nonlinear operation (calculating multiple, exponential or square number) or a combination of them, or even setting a complex function, thereby satisfying data transmission under various scenes.
In some embodiments, the data amount of the data expected to be transmitted is 4 bits. That is, the amount of data transmitted in each transmission process is 4 bits, and data received multiple times can be actually fused, for example, data of one byte (8 bits) is split into two times to be transmitted, so that efficiency and stability are both considered.
In some embodiments, in the above method, the number of transition edges is counted as follows: if the communication state is changed from the idle state to the data transmission state, counting the number of jumping edges; and if the communication state is changed from the data transmission state to the idle state, stopping counting the number of the jumping edges and obtaining a counting result of the number of the jumping edges.
The method for reading the number of the edges of the skip is not limited in the present application, and for example, an interrupt counting method may be adopted, and the number may also be counted by an independent peripheral module.
In some embodiments, in the above method, the device performing serial communication is divided into a master device and a slave device by role, and the serial communication method is performed by the master device, and the serial communication method further includes: determining a starting time point of communication according to data expected to be sent by the equipment; at the start time point, the level state of the data synchronization line is changed so that the communication state is changed to the data transmission state.
That is, the data synchronization line may be controlled only by the host device, thereby realizing control of the communication state. The master device can know the time point of the level needing to be pulled up according to the data to be transmitted, and the slave device only needs to start or stop the jump edge counting correspondingly according to the level state of the data synchronization line and transmit the data through the data receiving line.
In some embodiments, the serial communication method further comprises: and after the first number of jumping edges are sent, changing the level state of the data synchronization line so as to change the communication state into an idle state.
For example, when the data synchronization line is pulled to a high level, the corresponding communication state is an idle state, the host device pulls the data transmission line to a high level, and stops reading the number of the jumping edges on the data reception line; the slave device pulls the data transmit line high as well, while the slave device stops reading the transition edge data on the data transmit line.
In some embodiments, the serial communication method further comprises: and merging the data obtained by the translation for a plurality of times according to a predefined data format. For example, for 8-bit hexadecimal data, two transmissions may be made. In some embodiments, merging the data resulting from the several translations includes: the data translated first is used as low-order data, and the data translated later is used as high-order data.
Referring now to an embodiment, a timing diagram can be seen with reference to fig. 2.
Initially, the communication state is initially an IDLE state (IDLE), and the Data synchronization line SYNC, the Data transmission line Data Out, and the Data reception line Data In line are all at a high level. The master device transmits data 0x65(Tx 0x65) to the slave device, and executes the following steps 1 to 12:
step 1, the host equipment controls the SYNC line to be pulled down.
And 2, only 4-bit data can be sent during the low level period of the SYNC line each time, and the low 4-bit (LSB 4-bit) of the byte is sent first.
Step 3, the low 4bit of 0x65 is 0x5, and the host device sends 5 transition edges (3 falling edges, 2 rising edges) to the Data out line.
And 4, after the slave equipment detects that the SYNC line is pulled low, counting the number of jumping edges on the Data Out line.
And step 5, after the host equipment sends the low 4-bit Data, pulling up the SYNC line, and then pulling up the Data Out line.
And 6, stopping the detection of the jumping edge after the slave equipment detects that the SYNC line is pulled high, and storing the Data 0x5 corresponding to the counted number of the jumping edges of the Data Out line of 5.
And 7, the host equipment pulls down the SYNC line and starts to transmit data with 4bit high (MSB 4 bit).
Step 8, the host device sends 6 jumping edges (3 falling edges, 3 rising edges) to the Data Out line.
And 9, after the slave device detects that the SYNC line is pulled low, counting the number of jumping edges on the Data Out line.
And step 10, after the host equipment sends the high 4-bit Data, pulling up the SYNC line, and then pulling up the Data Out line.
And step 11, after detecting that the SYNC line is pulled high, the slave equipment stops the detection of the jumping edge and stores the Data 0x6 corresponding to the counted number 6 of the jumping edges of the Data Out line.
In step 12, the slave device performs an operation on the data 0x5 saved in step 6 and the data 0x6 obtained in step 11 (0x6< <4|0x5) to obtain a byte 0x 65.
To this end, the master device sends byte 0x65 to the slave device process ends.
During this time, the slave device may also send data 0x46(Rx 0x46) to the master device, and perform the following steps 13 to 20:
and step 13, after detecting that the SYNC line is pulled down, the slave equipment sends 6 jumping edges (3 falling edges and 3 rising edges) to the Data In line.
And step 14, after pulling down the SYNC line, the host equipment starts to count the jumping edge on the Data In line.
And step 15, the host device raises the SYNC line and stores the Data 0x6 corresponding to the jump edge number 6 read on the Data In line.
And step 16, the slave device detects that the SYNC line is pulled high, pulls the Data In line high, and enters an idle state.
And step 17, after detecting that the SYNC line is pulled low, the slave device sends 4 jumping edges (2 falling edges and 2 rising edges) to the Data In line.
And step 18, after pulling down the SYNC line, the host equipment starts to count the jumping edge on the Data In line.
In step 19, the host device raises the SYNC line and stores the Data 0x4 corresponding to the jump edge number 4 read on the Data In line.
In step 20, the host device performs an operation on the data 0x6 saved in step 4 and the data 0x4 obtained in step 8 (0x4< <4|0x6) to obtain a byte 0x 46.
To this end, the slave device sends byte 0x46 to the master device process ends.
An embodiment of the present application further provides a serial communication apparatus, where a data synchronization line, a data transmission line, and a data reception line are connected between devices performing serial communication, and the serial communication apparatus is configured to implement the serial communication method as described above.
Specifically, fig. 3 shows a schematic structural diagram of a serial communication apparatus according to an embodiment of the present application. As shown in fig. 3, the serial communication apparatus 300 includes:
a communication status unit 310 for determining a communication status according to a level status of the data synchronization line.
The data interaction unit 320 is configured to send a first number of hopping edges through a data sending line when the communication state is a data transmission state, so that the peer device translates the number of received hopping edges into data that the peer device expects to send; and/or receiving a second number of hopping edges through a data receiving line, and translating the received hopping edge number into data expected to be sent by the opposite terminal equipment.
In some embodiments, in the above apparatus, the data interaction unit 320 is configured to convert the received number of transition edges into a preset binary value; or, performing preset linear operation and/or nonlinear operation on the received number of the jumping edges, and converting the operation result into a numerical value of a preset system.
In some embodiments, the data amount of the data expected to be transmitted is 4 bits in the above apparatus.
In some embodiments, in the above apparatus, the data interaction unit 320 is configured to count the number of transition edges by: if the communication state is changed from the idle state to the data transmission state, counting the number of jumping edges; and if the communication state is changed from the data transmission state to the idle state, stopping counting the number of the jumping edges and obtaining a counting result of the number of the jumping edges.
In some embodiments, the device performing serial communication is divided into a master device and a slave device according to roles, and if the apparatus is deployed in the master device, the communication state unit 310 is further configured to determine a start time point of communication according to data expected to be sent by the device; at the start time point, the level state of the data synchronization line is changed so that the communication state is changed to the data transmission state.
In some embodiments, if the apparatus is deployed in a host device, the communication status unit 310 is further configured to change the level status of the data synchronization line after the first number of transition edges are transmitted, so that the communication status is changed to an idle status.
In some embodiments, in the above apparatus, the data interaction unit 320 is further configured to combine the data obtained by the plurality of translations according to a predefined data format.
In some embodiments, in the above apparatus, the data exchange unit 320 is further configured to use the data obtained by first translating as low-order data and the data obtained by second translating as high-order data.
It can be understood that the serial communication device can implement the steps of the serial communication method provided in the foregoing embodiments, and the explanations regarding the serial communication method are applicable to the serial communication device, and are not repeated herein.
Fig. 4 is a schematic structural diagram of a serial communication system according to an embodiment of the present application, and as shown In fig. 4, a serial communication system 400 includes a master device 410 and a slave device 420, and a Data synchronization line SYNC, a Data transmission line Data Out, and a Data reception line Data In are connected between the master device and the slave device; a master device 410 for controlling a level state of the data sync line to control a communication state between the master device 410 and the slave device 420; the host device 410 is used for sending a first number of jumping edges through a data sending line under the condition that the communication state is a data transmission state; and/or receiving a second number of transition edges over a data receive line, translating the received number of transition edges into data expected to be transmitted by slave device 420; the slave device 420 is configured to send a second number of transition edges through the data receiving line if the communication status is the data transmission status; and/or receive a first number of transition edges over the data receive line, translate the number of transition edges received into data that the host device 410 expects to transmit.
In some embodiments, in the above system, the master device 410 and/or the slave device 420 are configured to convert the received number of transition edges into a preset binary value; or, performing preset linear operation and/or nonlinear operation on the received number of the jumping edges, and converting the operation result into a numerical value of a preset system.
In some embodiments, the data volume of the data expected to be transmitted is 4 bits in the above system.
In some embodiments, in the above system, the master device 410 and/or the slave device 420 are configured to count the number of transition edges by: if the communication state is changed from the idle state to the data transmission state, counting the number of jumping edges; and if the communication state is changed from the data transmission state to the idle state, stopping counting the number of the jumping edges and obtaining a counting result of the number of the jumping edges.
In some embodiments, in the above system, the host device 410 is further configured to determine a starting time point of communication according to data expected to be transmitted by the device; at the start time point, the level state of the data synchronization line is changed so that the communication state is changed to the data transmission state.
In some embodiments, in the above system, the host device 410 is further configured to change the level state of the data synchronization line after the first number of transition edges have been transmitted, so as to change the communication state to the idle state.
In some embodiments, in the above system, the master device 410 and/or the slave device 420 are configured to merge data obtained by the translation for several times according to a predefined data format.
In some embodiments, in the above system, the master device 410 and/or the slave device 420 are configured to use the data translated first as low-order data and the data translated later as high-order data.
In summary, in the technical scheme of the present application, serial communication is implemented based on the data synchronization line, the data transmission line and the data reception line, and the control of the communication state is implemented by using the data synchronization line without limiting the baud rate of the communication clock or the time interval of data acquisition; a data transmission mode with the number of jumping edges is utilized to replace a level transmission mode in the prior art, interference resistance is easy to achieve, and data transmission is stable.
While the foregoing is directed to embodiments of the present application, other modifications and variations of the present application may be devised by those skilled in the art in light of the above teachings. It should be understood by those skilled in the art that the foregoing detailed description is for the purpose of better explaining the present application, and the scope of protection of the present application shall be subject to the scope of protection of the claims.
Claims (10)
1. A serial communication method in which a data synchronization line, a data transmission line, and a data reception line are connected between devices that perform serial communication, the method comprising:
determining a communication state according to the level state of the data synchronization line;
in the case where the communication state is the data transmission state,
sending a first number of hopping edges through the data sending line, so that the opposite terminal equipment translates the received number of hopping edges into data expected to be sent by the equipment; and/or receiving a second number of hopping edges through the data receiving line, and translating the received hopping edge number into data expected to be sent by the opposite terminal equipment.
2. The method of claim 1, wherein said translating comprises:
converting the number of the received jump edges into a numerical value of a preset system;
alternatively, the first and second electrodes may be,
and carrying out preset linear operation and/or nonlinear operation on the received jump edge number, and converting the operation result into a numerical value of a preset system.
3. The method of claim 1, wherein the data amount of the data expected to be transmitted is 4 bits.
4. The method of claim 1, wherein the number of hop edges is counted by:
if the communication state is changed from the idle state to the data transmission state, counting the number of jumping edges;
and if the communication state is changed from the data transmission state to the idle state, stopping counting the number of the jumping edges and obtaining a counting result of the number of the jumping edges.
5. The method of claim 1, wherein the devices performing serial communication are divided into master devices and slave devices by role, the method being performed by the master device, the method further comprising:
determining a starting time point of communication according to data expected to be sent by the equipment;
and at the starting time point, changing the level state of the data synchronization line so as to change the communication state into a data transmission state.
6. The method of claim 5, wherein the method further comprises:
and after the first number of jumping edges are sent, changing the level state of the data synchronization line so as to change the communication state into an idle state.
7. The method of any one of claims 1 to 6, further comprising: and merging the data obtained by the translation for a plurality of times according to a predefined data format.
8. The method of claim 7, wherein merging the data from the plurality of translations comprises:
the data translated first is used as low-order data, and the data translated later is used as high-order data.
9. A serial communication device, characterized in that the device is used for realizing the serial communication method according to any one of claims 1-8.
10. A serial communication system comprises a host device and a slave device, wherein a data synchronization line, a data transmission line and a data receiving line are connected between the host device and the slave device;
the host device is used for controlling the level state of the data synchronization line so as to control the communication state between the host device and the slave device;
the host device is used for sending a first number of jumping edges through the data sending line under the condition that the communication state is a data transmission state; and/or receiving a second number of hopping edges through the data receiving line, and translating the received number of hopping edges into data expected to be sent by the slave equipment;
the slave device is used for sending a second number of jumping edges through the data receiving line under the condition that the communication state is a data transmission state; and/or receiving a first number of transition edges through the data receiving line, and translating the received number of transition edges into data expected to be sent by the host device.
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