CN108366129B - USB data transmission method, device and USB are from device adapter - Google Patents
USB data transmission method, device and USB are from device adapter Download PDFInfo
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- CN108366129B CN108366129B CN201810191669.1A CN201810191669A CN108366129B CN 108366129 B CN108366129 B CN 108366129B CN 201810191669 A CN201810191669 A CN 201810191669A CN 108366129 B CN108366129 B CN 108366129B
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- transactions requests
- device adapter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
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- Computer Networks & Wireless Communication (AREA)
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- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
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Abstract
The present invention provides the working method of USB adapter and USB adapters, are related to USB technical field.USB data transmission method provided by the invention, from device adapter after receiving the processing transactions requests that upstream end is issued, while will handle transactions requests to USB from equipment transmission, transactions requests will be also handled to be stored in the region reserved in downstream, in turn, after receiving USB NAK response receipt generated from equipment from device adapter, initiation that can be spontaneous is retransmitted, it no longer needs to initiate to retransmit by upstream end, workflow is simplified, the expense for carrying out data transmission between upstream end and downstream is controlled.
Description
Technical field
The present invention relates to USB technical fields, in particular to the working method and USB adapter of USB adapter.
Background technique
With the progress of electronic technology, USB data transmission technology is more mature.Execute the both ends of USB data transmission technology
It is upstream end and downstream respectively, specifically, upstream end is divided into USB main equipment (USB-Host, such as PC machine) and main equipment is suitable
Orchestration (USB Device Adaptor)；Downstream is divided into USB from equipment (USB-Device, such as USB storage device) He Congshe
Standby adapter (USB Host Adaptor).
When carrying out USB data transmission, in general, be to initiate to operate by upstream end first, by the control of USB main equipment,
Main equipment adapter first can send transactions requests to from device adapter, then, can turn the transactions requests from device adapter
USB is issued from equipment, so that USB is handled from equipment for the transactions requests.
But in fact, USB from equipment when receiving the transactions requests, benefit may be not yet ready for manage the affairs asking
It asks.
Summary of the invention
The purpose of the present invention is to provide the working method of USB adapter and USB adapters.
In a first aspect, the embodiment of the invention provides USB data transmission methods, comprising:
The processing transactions requests that upstream end is issued are received from device adapter；Handling transactions requests includes IN transactions requests
Or OUT transaction request；
Transactions requests will be handled from device adapter to send to USB from equipment；
It is stored in corresponding target storage from device adapter by transactions requests are handled, under the target storage is located at
It swims in end equipment；
If receiving USB from equipment NAK response receipt generated from device adapter, from device adapter from target
Processing transactions requests are transferred in memory block, and the processing transactions requests being deployed into are sent to USB from equipment.
With reference to first aspect, the embodiment of the invention provides the first possible embodiments of first aspect, wherein step
If receiving USB from equipment NAK response receipt generated from device adapter suddenly, from device adapter from target storage
Processing transactions requests are transferred, and sends the processing transactions requests being deployed into from equipment to USB and includes:
USB is being received after equipment NAK response receipt generated from device adapter, starts to carry out the first timing,
And when the first timing reaches preset first threshold, processing transactions requests are transferred from device adapter from target storage, and
The processing transactions requests being deployed into are sent to USB from equipment；The time span of first timing with receive about processing affairs ask
The being positively correlated property of number for the NAK response receipt asked.
With reference to first aspect, the embodiment of the invention provides second of possible embodiments of first aspect, wherein step
If receiving USB from equipment NAK response receipt generated from device adapter suddenly, from device adapter from target storage
Processing transactions requests are transferred, and sends the processing transactions requests being deployed into from equipment to USB and includes:
When the second timing reaches preset second threshold, and USB has been received from device adapter and is generated from equipment
NAK response receipt when, then transfer processing transactions requests from device adapter from target storage, and send to USB from equipment
The processing transactions requests being deployed into；Second timing is when that will handle transactions requests to USB from equipment transmission from device adapter
Start progress；The time span of second timing with receive the number about the NAK response receipt of processing transactions requests in just
Correlation.
With reference to first aspect, the embodiment of the invention provides the third possible embodiments of first aspect, wherein step
If receiving USB from equipment NAK response receipt generated from device adapter suddenly, from device adapter from target storage
Processing transactions requests are transferred, and sends the processing transactions requests being deployed into from equipment to USB and includes:
When receiving USB NAK response receipt generated from equipment from device adapter, then at once from device adapter
Processing transactions requests are transferred from target storage, and send the processing transactions requests being deployed into USB from equipment.
With reference to first aspect, the embodiment of the invention provides the 4th kind of possible embodiments of first aspect, wherein step
If receiving USB from equipment NAK response receipt generated from device adapter suddenly, from device adapter from target storage
Processing transactions requests are transferred, and sends the processing transactions requests being deployed into from equipment to USB and includes:
When third timing reaches preset third threshold value, and it is generated just from equipment not receive from device adapter USB
When really replying message, then processing transactions requests are transferred from device adapter from target storage, and transfer to USB from equipment transmission
The processing transactions requests arrived；Third timing be from device adapter will handle transactions requests to USB since equipment send when
It carries out；The time span of third timing is positively correlated with receiving about the number of NAK response receipt of processing transactions requests
Property.
With reference to first aspect, the embodiment of the invention provides the 5th kind of possible embodiments of first aspect, wherein step
If receiving USB from equipment NAK response receipt generated from device adapter suddenly, from device adapter from target storage
Processing transactions requests are transferred, and sends the processing transactions requests being deployed into from equipment to USB and includes:
When the 4th timing reaches preset 4th threshold value, and it is generated just from equipment not receive from device adapter USB
When really replying message, then PING instruction is sent from device adapter to USB from equipment；If receive USB from equipment return about
The reply of PING instruction then transfers processing transactions requests from device adapter from target storage, and sends and adjust to USB from equipment
The processing transactions requests got；4th timing is opened when that will handle transactions requests to USB from equipment transmission from device adapter
What the beginning carried out；The time span of 4th timing with receive the number about the NAK response receipt of processing transactions requests in positive
Guan Xing.
With reference to first aspect, the embodiment of the invention provides the 6th kind of possible embodiments of first aspect, wherein step
If receiving USB from equipment NAK response receipt generated from device adapter suddenly, from device adapter from target storage
Processing transactions requests are transferred, and sends the processing transactions requests being deployed into from equipment to USB and includes:
When receiving USB NAK response receipt generated from equipment from device adapter, then from device adapter to
USB sends PING instruction from equipment；If receiving USB returns to the reply instructed about PING from equipment, from device adapter
Processing transactions requests are transferred from target storage, and send the processing transactions requests being deployed into USB from equipment.
Second aspect, the embodiment of the invention also provides USB adapters, comprising:
Receiving module, the processing transactions requests issued for receiving upstream end；Handling transactions requests includes that IN affairs are asked
It asks or OUT transaction is requested；
Sending module is sent for that will handle transactions requests to USB from equipment；
Preserving module is stored in corresponding target storage for that will handle transactions requests, and the target storage is located at
In downstream-end device；
Retransmit module, for when receiving USB NAK response receipt generated from equipment from device adapter, then from
Processing transactions requests are transferred in target storage, and the processing transactions requests being deployed into are sent to USB from equipment.
In conjunction with second aspect, the embodiment of the invention provides the first possible embodiments of second aspect, wherein weight
Module is sent out, is further used for receiving USB after equipment NAK response receipt generated, starts to carry out the first timing, and work as
When first timing reaches preset first threshold, processing transactions requests are transferred from device adapter from target storage, and to USB
The processing transactions requests being deployed into are sent from equipment；The time span of first timing with receive about processing transactions requests
The being positively correlated property of number of NAK response receipt.
In conjunction with second aspect, the embodiment of the invention provides second of possible embodiments of second aspect, wherein weight
Module is sent out, is further used for reaching preset second threshold when the second timing, and USB has been received from setting from device adapter
When standby NAK response receipt generated, then transfer processing transactions requests from device adapter from target storage, and to USB from
Equipment sends the processing transactions requests being deployed into；Second timing is will to handle transactions requests to USB from setting from device adapter
Start progress when preparation is sent；The time span of second timing with receive the NAK response receipt about processing transactions requests
Being positively correlated property of number.
USB data transmission method provided in an embodiment of the present invention is receiving what upstream end was issued from device adapter
After handling transactions requests, while will handle transactions requests to USB from equipment transmission, also processing transactions requests are stored in
In the region reserved in downstream, in turn, returned when receiving USB from device adapter from equipment NAK response generated
After holding, initiation that can be spontaneous is retransmitted, it is no longer necessary to be initiated to retransmit by upstream end, be simplified workflow, control upstream end
The expense of data transmission is carried out between downstream.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is shown in the related technology, handles the basic timing map flow chart of IN type transaction；
Fig. 2 shows the basic flow charts of the working method of USB adapter provided by the embodiment of the present invention；
Fig. 3 shows the timing flow chart of the first workflow of USB adapter provided by the embodiment of the present invention；
Fig. 4 shows the timing flow chart of second of workflow of USB adapter provided by the embodiment of the present invention；
Fig. 5 shows the timing flow chart institute of second of workflow of USB adapter provided by the embodiment of the present invention
Corresponding system architecture diagram；
Fig. 6 shows USB data transmission schematic device provided by the embodiment of the present invention.
Specific embodiment
Below in conjunction with attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Usually exist
The component of the embodiment of the present invention described and illustrated in attached drawing can be arranged and be designed with a variety of different configurations herein.Cause
This, is not intended to limit claimed invention to the detailed description of the embodiment of the present invention provided in the accompanying drawings below
Range, but it is merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
In the related technology, USB data transmission has been had already appeared, USB data transmission has been carried out according to USB data transmission type
If classification, two classes can be divided into, be IN type transaction and OUT type transaction respectively.
The flow direction that IN type transaction is primarily referred to as data packet (DATA) current transmission is by USB-Device (USB from equipment)
It is directed toward the data transmission procedure of USB-Host (USB main equipment), is equivalent to and initiates to request by USB-Host, and clear usb data
Transmission direction be by USB from equipment to USB main equipment.
The flow direction that OUT type transaction is primarily referred to as data packet (DATA) current transmission is to be directed toward USB- by USB-Host
The data exchange process of Device is equivalent to and initiates to request by USB-Host, and the transmission direction of clear usb data is by USB
Main equipment is to USB from equipment.
IN/OUT affairs are only used for the flow direction of notification data transmission, in practical implementation, the content of specific data transmission
It is determined by upper-layer protocol.
As shown in Figure 1, showing in the related technology, the basic timing map flow chart of IN type transaction is handled, is specifically included
Following steps:
Step 1, USB main equipment (USB Host) is by the IN transactions requests of generation to main equipment adapter (USB Host
Adaptor it) sends；
Step 2, the IN transactions requests that USB main equipment is issued are transmitted to from device adapter (USB by main equipment adapter
Device Adaptor)；
Step 3, USB is transmitted to from equipment from device adapter by the IN transactions requests that main equipment adapter is issued；
Step 4, USB sends feedback data to from device adapter from equipment (USB Device) according to IN transactions requests
It wraps (DATA)；From device adapter after receiving feedback data packet, parallel execution of steps 5 and step 6；
Step 5, from device adapter to USB from equipment feeding back ACK response receipt, to inform to USB from equipment from equipment
Adapter is successfully received feedback data packet；
Step 6, feedback data packet is sent from device adapter to main equipment adapter；Main equipment adapter is receiving instead
Parallel execution of steps 7 and 8 after feedback data packet；
Step 7, main equipment adapter is to from device adapter feeding back ACK response receipt, to inform to from device adapter
Main equipment adapter is successfully received feedback data packet；
Step 8, main equipment adapter sends feedback data packet to USB main equipment.
IN type transaction is completed by above-mentioned 8 steps, wherein step 5 and 6 is to execute parallel, and step 7 and 8 is simultaneously
Row executes.
The above process has reacted ideally, the treatment process of IN type transaction, but in fact, USB is connecing from equipment
When receiving IN transactions requests, benefit may be not yet ready for and manage the transactions requests, at this point, step 4 can then be changed to USB from equipment
NAK response receipt is fed back to from device adapter, to indicate that USB is not yet ready for quite from equipment into feedback data packet.At this point, phase
Current process (no longer execution step 5 and subsequent step) will be terminated from device adapter in the technology of pass.In order to improve this place
Reason mode would generally establish the retransmission mechanism at main equipment end in the related technology, it is, if USB main equipment is having issued IN
If being not received by feedback data packet in a period of time of (step 1) after transactions requests, then it can re-initiate an affairs and ask
It asks and (re-execute the steps 1) and carry out error correction, to complete IN type transaction according to the above process.Either exist from device adapter
After receiving the NAK response receipt that USB is fed back from equipment, also NAK can be sent to USB main equipment by main equipment adapter and answered
Receipt is answered, so that USB main equipment re-initiates a transactions requests (re-executeing the steps 1), to complete according to the above process
IN type transaction.
But present inventor has found that this processing mode is simultaneously unreasonable, if mainly re-executeing the steps 1, then can
Increase main equipment adapter and (is embodied in step 2), this leads to main equipment adapter from the interaction between device adapter
And more occupied from the bandwidth resources between device adapter, moreover, in some cases, upstream end or downstream would generally
Usb data is carried out with multiple opposite ends (other downstreams or other upstream ends) simultaneously to interact, and is re-initiated in this way by USB main equipment
Transactions requests then can be bigger occupy the bandwidth resources of upstream end or downstream, and then further tie down upstream end or downstream
Performance.
For this kind of situation, this application provides a kind of USB data transmission method of improvement, the transmission method, this method
The slave device adapter in downstream-end device is acted on, downstream-end device includes from device adapter and USB from equipment, from equipment
Adapter and USB are electrically connected from equipment, as shown in Fig. 2, this method comprises the following steps:
S101 receives the processing transactions requests that upstream end is issued from device adapter；Handling transactions requests includes IN thing
Business request or OUT transaction request；
S102 will handle transactions requests from device adapter and send to USB from equipment；
S103 is stored in corresponding target storage, the target storage from device adapter by transactions requests are handled
In downstream-end device；
S104, if receiving USB from equipment NAK response receipt generated, from device adapter from device adapter
Processing transactions requests are transferred from target storage, and send the processing transactions requests being deployed into USB from equipment.
In step S101, issue processing transactions requests is usually the main equipment adapter in upstream end, under the conditions of certain,
Issue the other unit of processing transactions requests being also possible in upstream end.Generate processing transactions requests is usually in upstream end
USB main equipment, under the conditions of certain, under the conditions of certain, generate processing transactions requests other lists being also possible in upstream end
Position.
Issue the unit (such as main equipment adapter) of processing transactions requests, can using wired or wireless way with from equipment
Adapter is attached, and wired finger is in such a way that the transmission cables such as optical fiber, twisted pair are attached.
In step S102 and S103, parallel execution two movements are needed from device adapter, are that will handle affairs respectively
It requests (the processing transactions requests that upstream end is issued) to send to USB from equipment, and processing transactions requests is stored in correspondence
Target storage.The context of this step S102 and S103 are not limited in scheme provided herein, the two are dynamic
Work can execute (any of the two movements can first carry out, and be also possible to two movements and be performed simultaneously) parallel.Or
The condition that person says that triggering S102 and S103 is executed all is that step S101 is finished.
Specifically, being that IN transactions requests (IN Transaction) and OUT transaction are asked respectively there are two types of processing transactions requests
Ask (OUT Transaction).
Under normal circumstances, target storage is preparatory to distribute from device adapter, and then destination adapter is connecing
It receives after handling transactions requests, so that it may be done directly preservation and act.Target storage is located in downstream-end device, refers to
It is the movement that storage can be done directly from device adapter, transactions requests will be handled by, which not needing, is stored in external memory
(for example do not need transactions requests will be handled from device adapter be sent to third party's storage equipment by wireless network), in this way can be with
It improves efficiency to a certain extent.
As explanation hereinbefore is sent to from device adapter after receiving processing transactions requests to USB from equipment
Handle transactions requests, and USB from equipment then due to the limitation of its own situation, may generate at least two it is different as a result,
It is to generate correctly to reply message (such as DATA data packet or ACK response receipt) and NAK response receipt respectively.Wherein, work as processing
When transactions requests are IN transactions requests, DATA data packet, which is USB, responds IN transactions requests from equipment, using from specified memory block
What the data being deployed into were formed, NAK response receipt can be USB and cannot respond to IN transactions requests from equipment, generate DATA number
Receipt is informed according to (when USB handles the processing transactions requests from Not ready), one of generation is interim when packet.
When handling transactions requests is OUT transaction request, ACK response receipt is that USB is able to respond OUT transaction from equipment and asks
It asks, i.e., DATA data packet corresponding to OUT transaction request (the DATA data packet can carry in OUT transaction request) carries out
Generated when processing (for example storing the data in DATA data packet), corresponding, NAK response receipt can also be
USB cannot respond to OUT transaction request, i.e. when USB can not be handled DATA data packet from equipment, the one of feedback from equipment
A interim informing receipt.
No matter which kind of state USB is in from equipment, corresponding response receipt can be all fed back to from device adapter.If from
Device adapter receives the NAK response receipt (the response receipt about processing transactions requests) that USB is fed back from equipment, then walks
In rapid S104, processing transactions requests are transferred from device adapter from target storage, it is, in step S104, it is suitable from equipment
Orchestration is that the processing transactions requests that will be saved in step S103 take out.After being deployed into processing transactions requests, from equipment
Adapter just sends the processing transactions requests to USB from equipment again, so that USB responds the processing affairs being deployed into from equipment
Request.
Method provided herein not for another example in traditional scheme, is started by upstream end and retransmits operation, but by downstream
In the starting of slave device adapter retransmit operation, in this way, just alleviate the data interaction frequency between upstream end and downstream, save
About bandwidth between the two.
In fact, the content of processing transactions requests sent in step S102 and step S104 is all identical.Step
After S104 is finished, it is also possible that the NAK response receipt that USB is issued from equipment is received, at this point, should hold again
Row step S104.It is, step can be triggered every time if USB returns to always NAK response receipt from equipment
S104。
As the embodiment of optimization, the weight that processing transactions requests are carried out by the way of controlling recurrence frequency can be
Hair, so that using corresponding processing strategie in different situations.The mode of six kinds of repeating transmission is provided below:
The first, step S104 is executed as follows:
USB is being received after equipment NAK response receipt generated from device adapter, starts to carry out the first timing,
And when the first timing reaches preset first threshold, processing transactions requests are transferred from device adapter from target storage, and
The processing transactions requests being deployed into are sent to USB from equipment.
Preferably, the time span of the first timing and the number for receiving the NAK response receipt about processing transactions requests
Being positively correlated property.The number for namely receiving NAK response receipt is more, and the time span of the first timing is longer.
Second, alternatively scheme can also be optimized, for example, step S104 is held as follows
Row:
When the second timing reaches preset second threshold, and USB has been received from device adapter and is generated from equipment
NAK response receipt when, then transfer processing transactions requests from device adapter from target storage, and send to USB from equipment
The processing transactions requests being deployed into；Second timing is when that will handle transactions requests to USB from equipment transmission from device adapter
Start progress.
Preferably, the time span of the second timing and the number for receiving the NAK response receipt about processing transactions requests
Being positively correlated property.The number for namely receiving NAK response receipt is read, and the time span of the second timing is longer.
The third, can also alternatively optimize scheme, for example, step S104 is held as follows
Row:
When receiving USB NAK response receipt generated from equipment from device adapter, then at once from device adapter
Processing transactions requests are transferred from target storage, and send the processing transactions requests being deployed into USB from equipment.
4th kind, alternatively scheme can also be optimized, for example, step S104 is held as follows
Row:
When third timing reaches preset third threshold value, and it is generated just from equipment not receive from device adapter USB
When really replying message, then processing transactions requests are transferred from device adapter from target storage, and transfer to USB from equipment transmission
The processing transactions requests arrived；Third timing be from device adapter will handle transactions requests to USB since equipment send when
It carries out.
Preferably, the time span of third timing and the number for receiving the NAK response receipt about processing transactions requests
Being positively correlated property.The number for namely receiving NAK response receipt is read, and the time span of third timing is longer.
5th kind, alternatively scheme can also be optimized, for example, step S104 is held as follows
Row:
When the 4th timing reaches preset 4th threshold value, and it is generated just from equipment not receive from device adapter USB
When really replying message, then PING instruction is sent from device adapter to USB from equipment；If receive USB from equipment return about
The reply of PING instruction then transfers processing transactions requests from device adapter from target storage, and sends and adjust to USB from equipment
The processing transactions requests got；4th timing is opened when that will handle transactions requests to USB from equipment transmission from device adapter
What the beginning carried out.If not receiving USB returns to the reply instructed about PING from equipment, current process is terminated.
Preferably, the time span of the 4th timing and the number for receiving the NAK response receipt about processing transactions requests
Being positively correlated property.The number for namely receiving NAK response receipt is read, and the time span of the 4th timing is longer.
6th kind, alternatively scheme can also be optimized, for example, step S104 is held as follows
Row:
When receiving USB NAK response receipt generated from equipment from device adapter, then from device adapter to
USB sends PING instruction from equipment；If receiving USB returns to the reply instructed about PING from equipment, from device adapter
Processing transactions requests are transferred from target storage, and send the processing transactions requests being deployed into USB from equipment.
Above-mentioned six kinds of implementations can be configured according to the difference of particular condition in use.Wherein, first threshold, second
The size relation of threshold value and third threshold value does not need to limit, as preferred implementation, first threshold, second threshold,
The numerical value of three threshold values and the 4th threshold value, which is both preferably, is greater than 1 millisecond, and the numerical value less than 20 milliseconds.
PING instruction be for verifying the USB instruction whether online from equipment, if USB is online from equipment,
Then USB can receive PING instruction from equipment and reply message backward from device adapter, to illustrate USB from equipment
It is online.
Under certain implementation, method provided herein can also disclosed in above-mentioned steps S101-S103 scheme
On the basis of, still use traditional retransmission mechanism, i.e., after receiving the processing transactions requests that upstream end newly issues according to
The mode of S101-S104 executes step S101-S103 using the processing transactions requests newly issued.
On the basis of above-mentioned six kinds of modes, following steps can also be increased in step S104:
If receiving USB after equipment NAK response receipt generated from device adapter, judgement receives NAK response
Whether the number of receipt is more than predetermined threshold, if not, according to the corresponding behaviour of execution any in above-mentioned the first-the six kind
Make.
Such as explanation hereinbefore, USB, then due to the limitation of its own situation, may generate at least two differences from equipment
As a result, in addition to generate correctly reply message with NAK response receipt other than, it is also possible to STALL data packet can be generated, to indicate USB
Suspended state is in from equipment or does not support the request, then should upstream hold the corresponding nothing of feedback from device adapter at this time
The message of method processing.That is, method provided herein further include:
If receive that USB issued from equipment from device adapter does not support data packet, upstream end feedback USB from
Equipment does not support the message handled.
In the following, illustrating the working method of USB adapter provided herein with 2 specific examples.
Example 1, as shown in figure 3, show send IN transactions requests when detailed process, the process act on upstream end and
Usb data interactive system composed by downstream, upstream end include USB main equipment and main equipment adapter, and downstream includes USB
From equipment and from device adapter, which includes the following steps:
Step 1, USB main equipment sends the IN transactions requests of generation to main equipment adapter；It is carried in IN transactions requests
There is IN Token (IN token)；
Step 2, the IN transactions requests that USB main equipment is issued are transmitted to from device adapter by main equipment adapter, with
Make to receive IN transactions requests from device adapter；
Step 3, it is sent from device adapter by IN transactions requests to USB from equipment；
Step 4, corresponding target storage, the target storage position are stored in from device adapter by IN transactions requests
In downstream-end device；
Step 5, after USB receives IN transactions requests from equipment, judgement can not currently handle the IN transactions requests, at this time
USB generates NAK response receipt from equipment；
Step 6, USB sends NAK response receipt to from device adapter from equipment；
Step 7, IN thing is transferred from target storage after receiving the NAK response receipt in step 6 from device adapter
Business request；
Step 8, it is sent from device adapter by the IN transactions requests being deployed into step 7 to USB from equipment；
Step 9, after USB receives the IN transactions requests in step 8 from equipment, judgement, which currently can handle the IN affairs, is asked
It asks, and returns to DATA data packet；
Step 10, USB sends the DATA data packet in step 9 to from device adapter from equipment, so that suitable from equipment
Orchestration receives DATA data packet；
Step 11, from device adapter to USB from equipment feeding back ACK response receipt, to inform to USB from equipment from equipment
DATA data packet has been received in adapter；
Step 12, it is sent from device adapter by DATA data packet to main equipment adapter, so that main equipment adapter connects
Receive DATA data packet；
Step 13, main equipment adapter is to from device adapter feeding back ACK response receipt, to inform to from device adapter
DATA data packet has been received in main equipment adapter；
Step 14, main equipment adapter sends DATA data packet to USB main equipment；Step 15, USB main equipment receives
To main equipment adapter feeding back ACK response receipt after DATA data packet, to complete whole processes.
Wherein, step 3 and step 4 are triggered by step 2, and there is no absolute successive between step 3 and step 4
Sequentially.Similar, step 11 and step 12 are triggered by step 10, and there is no absolute between step 11 and step 12
Sequencing.Similar, step 13 and step 14 are triggered by step 12, and there is no absolutely between step 13 and step 14
Pair sequencing.
Specifically, IN transactions requests, which can be request, carries out long-range transparent transmission video, audio or other any user's needs
Data request.
Example 2, as shown in figure 4, showing detailed process when sending OUT transaction request, which is acted on such as Fig. 5 institute
The system architecture shown, the system architecture include: upstream end, middle control end (being equivalent to downstream) and connector.Upstream end includes PC
(each PC is equivalent to USB main equipment), KVM signal sending end (being equivalent to main equipment adapter) are held, connector is KVM signal
Switching matrix (be equivalent to establish signal mapping channel between KVM signal sending end and KVM signal receiving end signal switching set
It is standby), downstream include KVM signal receiving end (being equivalent to from device adapter), USB storage device (being equivalent to USB from equipment),
Display array and HID human-computer interaction device (such as keyboard, mouse) process include the following steps:
Step 1, the OUT transaction of generation is requested to send to main equipment adapter by USB main equipment；It is taken in OUT transaction request
With OUT Token (OUT token) and DATA data packet；
Step 2, the request of OUT transaction that USB main equipment is issued is transmitted to from device adapter by main equipment adapter, with
Make to receive OUT transaction request from device adapter；
Step 3, it requests to send to USB from equipment from device adapter by OUT transaction；
Step 4, corresponding target storage, the target storage are stored in from device adapter by OUT transaction request
In downstream-end device；
Step 5, USB from equipment receive OUT transaction request after, judgement can not currently handle the OUT transaction request, at this time
USB generates NAK response receipt from equipment；
Step 6, USB sends NAK response receipt to from device adapter from equipment；
Step 7, OUT is transferred from target storage after receiving the NAK response receipt in step 6 from device adapter
Transactions requests；
Step 8, it requests to send to USB from equipment from device adapter by the OUT transaction being deployed into step 7；
Step 9, USB from equipment receive the OUT transaction in step 8 request after, judgement currently can handle the OUT transaction
Request, and the DATA data packet in OUT transaction request is stored in the memory block of downstream-end device, and feeding back ACK response
Receipt；
Step 10, USB sends the ACK response receipt in step 9 to from device adapter from equipment, so that suitable from equipment
Orchestration receives ACK response receipt；
Step 11, it from device adapter after receiving the ACK response receipt in step 10, is fed back to main equipment adapter
ACK response receipt；
Step 12, main equipment adapter is after receiving the ACK response receipt issued from device adapter, to USB master
Equipment feeding back ACK response receipt.
Wherein, step 3 and step 4 are triggered by step 2, and there is no absolute successive between step 3 and step 4
Sequentially.
Usual PC be after receiving mouse control command (key mouse control command can be the content that selection needs to transmit),
Above-mentioned OUT transaction process is executed again.Applied to above system, user can be by operating HID device, the specified PC hair of Xiang Yuancheng
It makes a gift to someone machine interactive instruction, PC responds the request of human-computer interaction order, executes corresponding OUT transaction, Lai Shixian PC and USB storage is set
Usb data orientation transparent transmission (i.e. PC sends usb data to USB storage device) between standby.
Based on the above method, present invention also provides USB adapters, comprising:
Receiving module, the processing transactions requests issued for receiving upstream end；Handling transactions requests includes that IN affairs are asked
It asks or OUT transaction is requested；
Sending module is sent for that will handle transactions requests to USB from equipment；
Preserving module is stored in corresponding target storage for that will handle transactions requests, and the target storage is located at
In downstream-end device；
Retransmit module, for when receiving USB NAK response receipt generated from equipment from device adapter, then from
Processing transactions requests are transferred in target storage, and the processing transactions requests being deployed into are sent to USB from equipment.
Preferably, module is retransmitted, is further used for receiving USB after equipment NAK response receipt generated, is started
Carry out the first timing, and when the first timing reaches preset first threshold, transferred from device adapter from target storage from
Transactions requests are managed, and send the processing transactions requests being deployed into USB from equipment；The time span of first timing and receive pass
In the being positively correlated property of number of the NAK response receipt of processing transactions requests.
Preferably, module is retransmitted, is further used for reaching preset second threshold when the second timing, and from device adapter
When USB NAK response receipt generated from equipment has been received, then processing thing is transferred from device adapter from target storage
Business request, and the processing transactions requests being deployed into are sent to USB from equipment；Second timing is will to handle thing from device adapter
Business request is carried out since when equipment is sent to USB；The time span of second timing and receive about processing transactions requests
NAK response receipt being positively correlated property of number.
Preferably, module is retransmitted, USB ought be received from device adapter by being further used for answers from equipment NAK generated
When answering receipt, then processing transactions requests are transferred from device adapter from target storage at once, and transfer to USB from equipment transmission
The processing transactions requests arrived.
Preferably, module is retransmitted, is further used for reaching preset third threshold value when third timing, and from device adapter
Do not receive USB from equipment it is generated correctly reply message when, then transfer processing affairs from device adapter from target storage
Request, and the processing transactions requests being deployed into are sent to USB from equipment；Third timing is will to handle affairs from device adapter
Request the progress since when equipment is sent to USB；The time span of third timing with receive about processing transactions requests
The being positively correlated property of number of NAK response receipt.
Preferably, module is retransmitted, is further used for reaching preset 4th threshold value when the 4th timing, and from device adapter
Do not receive USB from equipment it is generated correctly reply message when, then from device adapter to USB from equipment send PING instruction；
If receiving USB returns to the reply instructed about PING from equipment, processing thing is transferred from device adapter from target storage
Business request, and the processing transactions requests being deployed into are sent to USB from equipment；4th timing is will to handle thing from device adapter
Business request is carried out since when equipment is sent to USB；The time span of 4th timing and receive about processing transactions requests
NAK response receipt being positively correlated property of number.
Preferably, module is retransmitted, USB ought be received from device adapter by being further used for answers from equipment NAK generated
When answering receipt, then PING instruction is sent from device adapter to USB from equipment；If receiving USB to return from equipment about PING
The reply of instruction is then transferred processing transactions requests from device adapter from target storage, and is deployed into USB from equipment transmission
Processing transactions requests.
It corresponds to the above method, present invention also provides a kind of non-volatile program generations that can be performed with processor
The computer-readable medium of code, said program code make the processor execute any of the above-described a USB data transmission method.
It corresponds to the above method, as shown in fig. 6, for the dress of USB data transmission provided by another embodiment of the application
Schematic diagram is set, which includes: processor 61, memory 62 and bus 63, and memory 62 is stored with execution
Instruction is communicated between processor 61 and memory 62 by bus 63 when the device is running, and processor 61 executes in memory 62
Storage executes instruction as follows:
The processing transactions requests that upstream end is issued are received from device adapter；Handling transactions requests includes IN transactions requests
Or OUT transaction request；
Transactions requests will be handled from device adapter to send to USB from equipment；
It is stored in corresponding target storage from device adapter by transactions requests are handled, under the target storage is located at
It swims in end equipment；
If receiving USB from equipment NAK response receipt generated from device adapter, from device adapter from target
Processing transactions requests are transferred in memory block, and the processing transactions requests being deployed into are sent to USB from equipment.
Processor 61 is specifically used for:
If step receives USB from equipment NAK response receipt generated from device adapter, from device adapter from
Processing transactions requests are transferred in target storage, and send the processing transactions requests being deployed into from equipment to USB and include:
USB is being received after equipment NAK response receipt generated from device adapter, starts to carry out the first timing,
And when the first timing reaches preset first threshold, processing transactions requests are transferred from device adapter from target storage, and
The processing transactions requests being deployed into are sent to USB from equipment；The time span of first timing with receive about processing affairs ask
The being positively correlated property of number for the NAK response receipt asked.
If being adapted to or, step receives USB from equipment NAK response receipt generated from device adapter from equipment
Device transfers processing transactions requests from target storage, and sends the processing transactions requests being deployed into from equipment to USB and include:
When the second timing reaches preset second threshold, and USB has been received from device adapter and is generated from equipment
NAK response receipt when, then transfer processing transactions requests from device adapter from target storage, and send to USB from equipment
The processing transactions requests being deployed into；Second timing is when that will handle transactions requests to USB from equipment transmission from device adapter
Start progress；The time span of second timing with receive the number about the NAK response receipt of processing transactions requests in just
Correlation.
If being adapted to or, step receives USB from equipment NAK response receipt generated from device adapter from equipment
Device transfers processing transactions requests from target storage, and sends the processing transactions requests being deployed into from equipment to USB and include:
When receiving USB NAK response receipt generated from equipment from device adapter, then at once from device adapter
Processing transactions requests are transferred from target storage, and send the processing transactions requests being deployed into USB from equipment.
If being adapted to or, step receives USB from equipment NAK response receipt generated from device adapter from equipment
Device transfers processing transactions requests from target storage, and sends the processing transactions requests being deployed into from equipment to USB and include:
When third timing reaches preset third threshold value, and it is generated just from equipment not receive from device adapter USB
When really replying message, then processing transactions requests are transferred from device adapter from target storage, and transfer to USB from equipment transmission
The processing transactions requests arrived；Third timing be from device adapter will handle transactions requests to USB since equipment send when
It carries out；The time span of third timing is positively correlated with receiving about the number of NAK response receipt of processing transactions requests
Property.
If being adapted to or, step receives USB from equipment NAK response receipt generated from device adapter from equipment
Device transfers processing transactions requests from target storage, and sends the processing transactions requests being deployed into from equipment to USB and include:
When the 4th timing reaches preset 4th threshold value, and it is generated just from equipment not receive from device adapter USB
When really replying message, then PING instruction is sent from device adapter to USB from equipment；If receive USB from equipment return about
The reply of PING instruction then transfers processing transactions requests from device adapter from target storage, and sends and adjust to USB from equipment
The processing transactions requests got；4th timing is opened when that will handle transactions requests to USB from equipment transmission from device adapter
What the beginning carried out；The time span of 4th timing with receive the number about the NAK response receipt of processing transactions requests in positive
Guan Xing.
If being adapted to or, step receives USB from equipment NAK response receipt generated from device adapter from equipment
Device transfers processing transactions requests from target storage, and sends the processing transactions requests being deployed into from equipment to USB and include:
When receiving USB NAK response receipt generated from equipment from device adapter, then from device adapter to
USB sends PING instruction from equipment；If receiving USB returns to the reply instructed about PING from equipment, from device adapter
Processing transactions requests are transferred from target storage, and send the processing transactions requests being deployed into USB from equipment.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention.
And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1.USB data transmission method characterized by comprising
The processing transactions requests that upstream end is issued are received from device adapter；Processing transactions requests include IN transactions requests or
OUT transaction request；
Transactions requests will be handled from device adapter to send to USB from equipment；
It is stored in corresponding target storage from device adapter by transactions requests are handled, the target storage is located at downstream
In equipment；
If receiving USB from equipment NAK response receipt generated from device adapter, stored from device adapter from target
Area transfers processing transactions requests, and the processing transactions requests being deployed into are sent to USB from equipment.
2. the method according to claim 1, wherein if step receives USB from equipment institute from device adapter
The NAK response receipt of generation is then transferred processing transactions requests from device adapter from target storage, and is sent out to USB from equipment
The processing transactions requests being deployed into are sent to include:
USB is being received after equipment NAK response receipt generated from device adapter, starts to carry out the first timing, and work as
When first timing reaches preset first threshold, processing transactions requests are transferred from device adapter from target storage, and to USB
The processing transactions requests being deployed into are sent from equipment；The time span of first timing with receive about processing transactions requests
The being positively correlated property of number of NAK response receipt.
3. the method according to claim 1, wherein if step receives USB from equipment institute from device adapter
The NAK response receipt of generation is then transferred processing transactions requests from device adapter from target storage, and is sent out to USB from equipment
The processing transactions requests being deployed into are sent to include:
When the second timing reaches preset second threshold, and USB has been received from equipment NAK generated from device adapter
When response receipt, then processing transactions requests are transferred from device adapter from target storage, and be deployed into USB from equipment transmission
Processing transactions requests；Second timing be from device adapter will handle transactions requests to USB since equipment send when into
Capable；The time span of second timing and the being positively correlated property of number for receiving the NAK response receipt about processing transactions requests.
4. the method according to claim 1, wherein if step receives USB from equipment institute from device adapter
The NAK response receipt of generation is then transferred processing transactions requests from device adapter from target storage, and is sent out to USB from equipment
The processing transactions requests being deployed into are sent to include:
When receiving USB NAK response receipt generated from equipment from device adapter, then at once from device adapter from mesh
Processing transactions requests are transferred in mark memory block, and the processing transactions requests being deployed into are sent to USB from equipment.
5. the method according to claim 1, wherein if step receives USB from equipment institute from device adapter
The NAK response receipt of generation is then transferred processing transactions requests from device adapter from target storage, and is sent out to USB from equipment
The processing transactions requests being deployed into are sent to include:
When third timing reaches preset third threshold value, and USB is not received from device adapter and correct is returned from equipment is generated
When multiple message, then processing transactions requests are transferred from device adapter from target storage, and be deployed into USB from equipment transmission
Handle transactions requests；Third timing be from device adapter will handle transactions requests to USB since equipment send when carry out
's；The time span of third timing and the being positively correlated property of number for receiving the NAK response receipt about processing transactions requests.
6. the method according to claim 1, wherein if step receives USB from equipment institute from device adapter
The NAK response receipt of generation is then transferred processing transactions requests from device adapter from target storage, and is sent out to USB from equipment
The processing transactions requests being deployed into are sent to include:
When the 4th timing reaches preset 4th threshold value, and USB is not received from device adapter and correct is returned from equipment is generated
When multiple message, then PING instruction is sent from device adapter to USB from equipment；If receiving USB to return from equipment about PING
The reply of instruction is then transferred processing transactions requests from device adapter from target storage, and is deployed into USB from equipment transmission
Processing transactions requests；4th timing be from device adapter will handle transactions requests to USB since equipment send when into
Capable；The time span of 4th timing and the being positively correlated property of number for receiving the NAK response receipt about processing transactions requests.
7. the method according to claim 1, wherein if step receives USB from equipment institute from device adapter
The NAK response receipt of generation is then transferred processing transactions requests from device adapter from target storage, and is sent out to USB from equipment
The processing transactions requests being deployed into are sent to include:
When receiving USB NAK response receipt generated from equipment from device adapter, then from device adapter to USB from
Equipment sends PING instruction；The reply that instructs about PING is returned to from equipment if receiving USB, from device adapter from target
Processing transactions requests are transferred in memory block, and the processing transactions requests being deployed into are sent to USB from equipment.
8.USB is from device adapter characterized by comprising
Receiving module, the processing transactions requests issued for receiving upstream end；Processing transactions requests include IN transactions requests or
OUT transaction request；
Sending module is sent for that will handle transactions requests to USB from equipment；
Preserving module is stored in corresponding target storage for that will handle transactions requests, and the target storage is located at downstream
In end equipment；
Module is retransmitted, for when receiving USB NAK response receipt generated from equipment from device adapter, then from target
Processing transactions requests are transferred in memory block, and the processing transactions requests being deployed into are sent to USB from equipment.
9. a kind of computer-readable medium for the non-volatile program code that can be performed with processor, which is characterized in that described
Program code makes the processor execute described any the method for claim 1-7.
10.USB data transmission device, which is characterized in that the USB data transmission device includes: processor, memory and bus,
Memory, which is stored with, to be executed instruction, and when the apparatus is operative, by bus communication between processor and memory, processor is executed
The instruction as corresponding to any one of claim 1-7 method stored in memory.
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| CN201810191669.1A CN108366129B (en) | 2018-03-08 | 2018-03-08 | USB data transmission method, device and USB are from device adapter |
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| CN112533083B (en) * | 2020-12-01 | 2021-08-06 | 威创集团股份有限公司 | USB optical fiber exchange box and system |
| CN114244485B (en) * | 2021-12-03 | 2023-06-09 | 威创集团股份有限公司 | Data management method for USB signal long-distance transmission |
| CN114338707B (en) * | 2021-12-03 | 2023-03-24 | 威创集团股份有限公司 | Data management method and related device for USB signal transparent transmission multiple devices |
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