CN107273327A - Variable bit rate serial communication method, device, communication chip, storage device and system - Google Patents
Variable bit rate serial communication method, device, communication chip, storage device and system Download PDFInfo
- Publication number
- CN107273327A CN107273327A CN201710329523.4A CN201710329523A CN107273327A CN 107273327 A CN107273327 A CN 107273327A CN 201710329523 A CN201710329523 A CN 201710329523A CN 107273327 A CN107273327 A CN 107273327A
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- communication
- serial
- line interface
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C5/00—Registering or indicating the working of vehicles
- G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
- G07C5/0841—Registering performance data
- G07C5/085—Registering performance data using electronic data carriers
- G07C5/0866—Registering performance data using electronic data carriers the electronic data carrier being a digital video recorder in combination with video camera
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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
- G06F13/4291—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus using a clocked protocol
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Multimedia (AREA)
- General Engineering & Computer Science (AREA)
- Information Transfer Systems (AREA)
- Studio Devices (AREA)
Abstract
The present invention is applied to communication technical field, there is provided a kind of variable bit rate serial communication method, device, communication chip, storage device and system, methods described is included in communication process, and according to communication bandwidth instruction is changed, control clock generator produces the reference clock frequency of serial line interface；According to the reference clock frequency, the working clock frequency of the serial line interface is produced by presetting the first transfer function；According to the work clock, the communication frequency of the serial line interface is produced by presetting the second transfer function.The present invention, by matching the USB module of main camera system and the USB module of rear camera system, the problem of solving compatibility, the frequency of USB serial communications is adjusted, data communication bandwidth is increased, improves picture quality, meanwhile, allow dual camera drive recorder scheme to obtain lower cost.
Description
Technical field
The invention belongs to communication technical field, more particularly to a kind of variable bit rate serial communication method, device, communication core
Piece, storage device and system.
Background technology
At present, general dual camera drive recorder scheme all takes main camera system and rear camera system point
Open, the view data of rear camera system is sent to by main camera system by wired mode.Have two kinds it is main forward and backward
Camera system data communication mode：One kind is CVBS coaxial telecommunications modes, and another is usb communication mode.CVBS modes have
Have compatibility it is good, to the low advantage of wire quality requirement, but scheme holistic cost is high, picture quality is poor, is extremely difficult to use
The requirement of person's picture quality.And USB modes are divided into USB1.1 and two kinds of USB2.0, USB1.1 holistic costs are low but image matter
Amount is general, and USB2.0 holistic costs are high, but picture quality is preferably, and two kinds of USB modes all have the shortcomings that compatibility is poor.
In summary, the existing serial communication system as dual camera drive recorder exists and wants to reach image matter
Amount is high, but holistic cost it is higher the problem of.
The content of the invention
The embodiments of the invention provide a kind of variable bit rate serial communication method, device, communication chip, storage device and it is
System, it is intended to solve existing serial communication system and want to reach that picture quality is high, but holistic cost it is higher the problem of.
In a first aspect, the embodiments of the invention provide a kind of variable bit rate serial communication method, methods described includes：
In communication process, according to communication bandwidth instruction is changed, control clock generator produces the reference clock frequency of serial line interface；
According to the reference clock frequency, the working clock frequency of the serial line interface is produced by presetting the first transfer function；
According to the working clock frequency, the communication frequency of the serial line interface is produced by presetting the second transfer function.
Further, the serial line interface is USB1.1.
Further, the standard traffic frequency of the serial line interface is more than or equal to 12 Mbps.
Second aspect, the embodiments of the invention provide a kind of variable bit rate serial communication apparatus, described device includes：
Reference clock generation unit, in communication process, according to communication bandwidth instruction is changed, control clock generator to produce string
The reference clock frequency of line interface；
Working clock frequency generation unit, for according to the reference clock frequency, institute to be produced by default first transfer function
State the working clock frequency of serial line interface；
Communication frequency generation unit, for according to the working clock frequency, the string to be produced by default second transfer function
The communication frequency of line interface, the serial line interface is USB1.1.
Further, the standard traffic frequency of the serial line interface is 12 Mbps.
The third aspect, the embodiments of the invention provide a kind of communication chip, the communication chip includes at least one processing
Device, memory and interface, at least a processor, memory and the interface are connected by bus；
The memory storage computer executed instructions；
The computer executed instructions of memory storage described at least one described computing device so that the communication chip is performed
Above-mentioned variable bit rate serial communication method.
Fourth aspect, it is described to refer in the instruction that the embodiments of the invention provide a kind of storage device, is stored with described device
The step of order realizes above-mentioned variable bit rate serial communication method when being executed by processor.
5th aspect, the embodiments of the invention provide a kind of serial communication system, the system includes main camera system
System, rear camera system and serial communication cable, main camera system include the first main control unit and the first camera, and described the
One main control unit includes at least one first serial line interface and the first clock generator, and rear camera system includes the second master control list
Member and second camera, second main control unit include at least one second serial line interface and second clock generator, and master takes the photograph
As head system and rear camera system are linked together by serial communication cable, it is necessary to when changing communication bandwidth, described first
Main control unit, the second main control unit each perform above-mentioned variable bit rate serial communication method simultaneously.
Further, the quantity of the rear camera system is N number of, and N is the positive integer more than or equal to 1.
The embodiment of the present invention, by matching the USB module of main camera system and the USB module of rear camera system, solution
Certainly compatible the problem of, the frequency of USB serial communications is adjusted, increase data communication bandwidth, improve picture quality, meanwhile, allow
Dual camera drive recorder scheme obtains lower cost.
Brief description of the drawings
Fig. 1 is the structured flowchart for the serial communication system that the embodiment of the present invention one is provided；
Fig. 2 is the implementation process figure for the variable bit rate serial communication method that the embodiment of the present invention two is provided；
Fig. 3 is the structured flowchart for the variable bit rate serial communication apparatus that the embodiment of the present invention three is provided；
Fig. 4 is the structured flowchart for the communication chip that the embodiment of the present invention four is provided.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The realization of the present invention is described in detail below in conjunction with specific embodiment：
Embodiment one
Fig. 1 shows the concrete structure block diagram for the serial communication system that the embodiment of the present invention one is provided, and for convenience of description, only shows
The part related to the embodiment of the present invention is gone out.In the present embodiment, the serial communication system includes：Main camera system, after
Camera system and serial communication cable.
Wherein, main camera system includes the first main control unit and the first camera, and first main control unit is included extremely
Few first USB module and the first clock generator, rear camera system include the second main control unit and second camera, institute
Stating the second main control unit includes at least one second USB module and second clock generator, main camera system and rear camera
System is linked together by USB serial communication cables.
Nominally, the first clock generator produces the reference clock frequency 12MHz of the first USB module；According to described
Reference clock frequency, the working clock frequency of the first USB module is produced by presetting the first transfer function：12MHz * 4 =
48MHz；According to the working clock frequency, the communication frequency of the first USB module is produced by presetting the second transfer function：48/4
= 12Mbps。
When needing to change communication bandwidth, first main control unit is instructed according to communication bandwidth is changed, and controls the first clock
Generator produces the reference clock frequency of the first USB module：13MHz；According to the reference clock frequency, by presetting first turn
Exchange the letters number produces the working clock frequency of the first USB module：13MHz * 4 = 52MHz；According to the working clock frequency, lead to
Cross the communication frequency that default second transfer function produces the first USB module：52/4 = 13Mbps.
Meanwhile, second main control unit is instructed according to communication bandwidth is changed, and control second clock generator produces second
The reference clock frequency of USB module：13MHz；According to the reference clock frequency, second is produced by default first transfer function
The working clock frequency of USB module：13MHz * 4 = 52MHz；According to the working clock frequency, pass through default second conversion
Function produces the communication frequency of the second USB module：52/4 = 13Mbps.
Then main camera system and rear camera system in USB serial communications cable with higher communication frequency
13Mbps, is communicated instead of standard 12Mbps communication frequency, obtains higher communication bandwidth and higher-quality picture number
According to communication.
It is preferred that, the quantity of the rear camera system is N number of, and N is the positive integer more than or equal to 1.
The present embodiment, on the basis of standard USB1.1, by the USB module and rear camera that match main camera system
The USB module of system, the problem of solving compatibility adjusts the frequency of USB serial communications, increases data communication bandwidth, improves
Picture quality, meanwhile, allow dual camera drive recorder scheme to obtain lower cost.
Embodiment two
Fig. 2 shows the implementation process for the variable bit rate serial communication method that the embodiment of the present invention two is provided, and this method implements master
Body is the first main control unit or the second main control unit, and details are as follows：
In step s 201, in communication process, according to communication bandwidth instruction is changed, control clock generator produces serial line interface
Reference clock frequency.
In step S202, according to the reference clock frequency, the serial interface is produced by default first transfer function
The working clock frequency of mouth.
In step S203, according to the work clock, the serial line interface is produced by presetting the second transfer function
Communication frequency, the serial line interface is USB1.1.
It is preferred that, the standard traffic frequency of the serial line interface is more than or equal to 12 Mbps.
The present embodiment, on the basis of standard USB1.1, by the USB module and rear camera that match main camera system
The USB module of system, the problem of solving compatibility adjusts the frequency of USB serial communications, increases data communication bandwidth, improves
Picture quality, meanwhile, allow dual camera drive recorder scheme to obtain lower cost.
Embodiment three
Fig. 3 shows the concrete structure block diagram for the variable bit rate serial communication apparatus that the embodiment of the present invention three is provided, for the ease of
Illustrate, illustrate only the part related to the embodiment of the present invention.In the present embodiment, the variable bit rate serial communication apparatus bag
Include：Reference clock generation unit 31, work clock generation unit 32 and communication frequency generation unit 33.
Wherein, reference clock generation unit 31, in communication process, according to communication bandwidth instruction is changed, controlling clock
Generator produces the reference clock frequency of serial line interface；
Work clock generation unit 32, for according to the reference clock frequency, being produced by default first transfer function described
The working clock frequency of serial line interface；
Communication frequency generation unit 33, for according to the work clock, being produced by default second transfer function described serial
The communication frequency of interface, the serial line interface is USB1.1.
It is preferred that, the standard traffic frequency of the serial line interface is more than or equal to 12 Mbps.
Variable bit rate serial communication apparatus provided in an embodiment of the present invention can be applied in foregoing corresponding method embodiment two
In, details will not be repeated here referring to the description of above-described embodiment two.
Example IV
Fig. 4 shows the concrete structure block diagram for the communication chip that the embodiment of the present invention four is provided, and for convenience of description, illustrate only
The part related to the embodiment of the present invention.In the present embodiment, the communication chip includes：At least a processor 41, memory 42
And interface 43, at least a processor 41, memory 42 and the interface 43 are connected by bus；
The memory 42 stores computer executed instructions；
At least one described processor 41 performs the computer executed instructions that the memory 42 is stored so that the speech processes
The above-mentioned variable bit rate serial communication method of chip.
The embodiment of the present invention also provides the instruction that is stored with a kind of storage device, described device, and the instruction is by processor
The step of above-mentioned variable bit rate serial communication method is realized during execution.
It is worth noting that, one of ordinary skill in the art will appreciate that：The step of realizing above method embodiment or portion
It can be completed step by step by the related hardware of programmed instruction, foregoing program can be stored in embodied on computer readable storage Jie
In matter, the program upon execution, performs the step of including above method embodiment, and foregoing storage medium includes：ROM、
RAM, magnetic disc or CD etc. are various can be with the medium of store program codes.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (10)
1. a kind of variable bit rate serial communication method, it is characterised in that methods described includes：
In communication process, according to communication bandwidth instruction is changed, control clock generator produces the reference clock frequency of serial line interface；
According to the reference clock frequency, the working clock frequency of the serial line interface is produced by presetting the first transfer function；
According to the working clock frequency, the communication frequency of the serial line interface is produced by presetting the second transfer function.
2. according to the method described in claim 1, it is characterised in that the serial line interface is USB1.1.
3. according to the method described in claim 1, it is characterised in that the standard traffic frequency of the serial line interface is more than or equal to 12
Mbps。
4. a kind of variable bit rate serial communication apparatus, it is characterised in that described device includes：
Reference clock generation unit, in communication process, according to communication bandwidth instruction is changed, control clock generator to produce string
The reference clock frequency of line interface；
Work clock generation unit, for according to the reference clock frequency, the string to be produced by default first transfer function
The working clock frequency of line interface；
Communication frequency generation unit, for according to the working clock frequency, the string to be produced by default second transfer function
The communication frequency of line interface.
5. device according to claim 1, it is characterised in that the serial line interface is USB1.1.
6. device according to claim 1, it is characterised in that the standard traffic frequency of the serial line interface is more than or equal to 12
Mbps。
7. a kind of communication chip, it is characterised in that the communication chip includes at least a processor, memory and interface, described
At least a processor, memory and interface are connected by bus；
The memory storage computer executed instructions；
The computer executed instructions of memory storage described at least one described computing device so that the communication chip is performed
Variable bit rate serial communication method described in claim any one of 1-3.
8. a kind of storage device, it is characterised in that be stored with instruction in described device, the instruction is realized when being executed by processor
The step of variable bit rate serial communication method described in claim any one of 1-3.
9. a kind of serial communication system, it is characterised in that the system includes main camera system, rear camera system and serial
The communications cable, main camera system includes the first main control unit and the first camera, and first main control unit includes at least one
Individual first serial interface module and the first clock generator, rear camera system include the second main control unit and second camera,
Second main control unit includes at least one second serial interface module and second clock generator, and main camera system is with after
Camera system is linked together by serial communication cable, it is necessary to when changing communication bandwidth, first main control unit, second
Main control unit each performs the variable bit rate serial communication method described in the claims 1-3 simultaneously.
10. system according to claim 9, it is characterised in that the quantity of the rear camera system be it is N number of, N be more than
Positive integer equal to 1.
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| CN201710329523.4A CN107273327B (en) | 2017-05-11 | 2017-05-11 | Variable-rate serial communication method, device, communication chip, storage device and system |
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| CN201710329523.4A CN107273327B (en) | 2017-05-11 | 2017-05-11 | Variable-rate serial communication method, device, communication chip, storage device and system |
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| CN107273327A true CN107273327A (en) | 2017-10-20 |
| CN107273327B CN107273327B (en) | 2021-06-01 |
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Cited By (2)
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| CN111078615A (en) * | 2019-12-23 | 2020-04-28 | 福建北峰通信科技股份有限公司 | Compatible control system and method for serial port communication |
| CN112154491A (en) * | 2018-05-29 | 2020-12-29 | 西门子交通有限责任公司 | Method of setting an imaging sensor, computer program product for setting an imaging sensor, sensor setting system and facility |
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