CN108062281B - Method for solving disconnection of data copying between mass storage device and PC terminal - Google Patents
Method for solving disconnection of data copying between mass storage device and PC terminal Download PDFInfo
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- CN108062281B CN108062281B CN201711083137.8A CN201711083137A CN108062281B CN 108062281 B CN108062281 B CN 108062281B CN 201711083137 A CN201711083137 A CN 201711083137A CN 108062281 B CN108062281 B CN 108062281B
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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
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/20—Handling requests for interconnection or transfer for access to input/output bus
- G06F13/22—Handling requests for interconnection or transfer for access to input/output bus using successive scanning, e.g. polling
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Abstract
The technical scheme of the invention comprises a method for solving the problem of disconnection of data copying between a mass storage device and a PC terminal, which comprises the following steps: when the mass storage device and the PC terminal copy data, a timer is established in the storage device; when the time for processing the PC end command by the equipment end does not exceed the disconnection threshold value of the PC end, directly sending the CSW, and if the time exceeds the disconnection threshold value, replying the CSW by using a timer; and resetting the timer after the completion of the reply, and receiving the subsequent operation instruction of the PC terminal. The invention has the beneficial effects that: under the condition of not modifying the existing data writing mechanism of the equipment end, the disconnection caused by data writing can be effectively avoided, and the integrity of data can be ensured.
Description
Technical Field
The invention relates to a method for solving the problem of broken lines in data copying between a mass storage device and a PC (personal computer), belonging to the field of computer data interaction processing.
Background
Many mobile devices, especially some multimedia playing devices, need to be connected to a PC for data transmission, which is a common function, after the devices are connected to the PC through a USB cable, a mobile disk is popped up from the PC, and after the disk is opened, files on the PC can be copied to the device side for use.
The prior art scheme is as follows: in the prior art, data reading and writing are generally completed according to a Bulk-Only protocol, in this way, all commands are encapsulated in a CBW for transmission, a device end receives the CBW and then resolves the commands, and then executes corresponding commands, for example, if a command of write operation is received, data is written into a designated storage, and after the command is executed, the CSW is returned, and after receiving the CSW, the PC continues to send the CBW to execute the next command. After sending the CBW, the PC waits for the return of the CSW, and after a certain time, the PC considers that the communication is abnormal, and resets the device. That is, the processing time of the device is required, and many mass storage devices are disconnected when being connected to a PC for data copying, which results in data writing failure and the connection must be reestablished.
The prior art has the defects that CSW is returned to a PC after the write operation is finished, the write time of each stroke is different, a plurality of current mobile operating systems have read-write data cache, data are written into the cache firstly and then written back to equipment for storage, the write operation return time is relatively fast, but when the number of dirty pages of the system reaches a certain threshold value, the write-back storage operation is triggered, and the time required by the write operation is relatively long under the condition. For the PC, if the time waiting for CSW is long, about 9 seconds, the PC does not receive CSW yet, and sends a reset signal to the device. At this time, the situation that copying is not completed normally and the PC end prompts failure of disk writing is easy to occur.
Bulk-Only: USB organizations have developed a block storage class protocol for mass storage devices.
Command Block Wrapper (CBW): a data packet containing command blocks and associated information.
Command Status Wrapper (CSW): a data packet containing the status of the execution of the command block.
Disclosure of Invention
Aiming at the defects in the prior art, the technical scheme of the invention provides a method for solving the problem of disconnection in data copying between a mass storage device and a PC (personal computer) terminal, which is used for solving the defects in the prior art.
The technical scheme of the invention comprises a method for solving the problem of disconnection of data copying between a mass storage device and a PC terminal, and is characterized in that the method comprises the following steps: s1, when the mass storage device and the PC terminal copy data, a timer is established in the storage device; s2, when the time of the PC end command processing by the equipment end does not exceed the disconnection threshold value of the PC end, directly sending the CSW, and if the time exceeds the disconnection threshold value, replying the CSW by using a timer; and S3, clearing the timer after the completion of the reply, and receiving the subsequent operation instruction of the PC terminal.
According to the method for solving the problem of disconnection in data copying between the mass storage device and the PC, step S1 further includes: the data copying sizes of the equipment end and the PC end are detected, if the data to be copied exceed a specified threshold value, a corresponding timer is established for the equipment end, the timing time is set, and the timer needs to be initialized when a command is received.
According to the method for solving the problem that the data copying between the mass storage device and the PC terminal is broken, the device terminal initializes the timer after receiving the CBW sent by the PC terminal.
According to the method for solving the problem that the data copying between the mass storage device and the PC terminal is broken, the timing time does not exceed the broken line threshold value of the PC terminal.
According to the method for solving the problem that the data copying between the mass storage device and the PC end is broken, the broken line threshold value of the PC end is set to be 8-10 s, 8s is compatibility setting, and 9-10 s is general setting.
According to the method for solving the problem of disconnection in data copying between the mass storage device and the PC, step S2 further includes: and the equipment side analyzes the command in the CBW and further executes the corresponding command, if the time of the executed command does not exceed the disconnection threshold value of the PC side, the CSW is replied, and if the time of the executed command exceeds the disconnection threshold value of the PC side, the action of replying the CSW is executed by using a callback function in a timer.
According to the method for solving the problem of disconnection in data copying between the mass storage device and the PC, step S3 further includes: and after the CSW is replied, clearing the timer and continuously receiving the next command of the PC side processed by the CBW.
The method for solving the problem of disconnection of the data copy between the mass storage device and the PC terminal is characterized by further comprising the following steps: the data copying between the mass storage device and the PC terminal refers to transmitting the storage data of the mass storage device to the PC terminal through a data connection line, and may also refer to storing the data suitable for the mass storage device to store in the PC terminal to the mass storage device through the data connection line.
The invention has the beneficial effects that: under the condition of not modifying the existing data writing mechanism of the equipment end, the disconnection caused by data writing can be effectively avoided, and the integrity of data can be ensured.
Drawings
FIG. 1 shows a general flow diagram according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. The method for solving the problem of disconnection of the data copying between the mass storage device and the PC terminal is suitable for the data copying between the mass storage device and the PC terminal.
Fig. 1 is a general structural view illustrating an embodiment according to the present invention.
(1) When the device enters a mass storage mode, a timer is newly established.
(2) And when the equipment end receives the CBW, initializing the timer, and setting the timing time of the timer at 8 seconds.
(3) The device terminal parses the command, and then executes the corresponding command, for example, the write data calls a write file interface of the system, and then waits for the return.
(4) After the device executes the command, the CSW is replied, and the timer is cleared.
(5) If the timing of 8 seconds is up during the execution of the command, indicating that the CSW can not return in time, the device executes the action of replying to the CSW in the callback function of the timer.
(6) And resetting the timer after the CSW is recovered.
(7) The next command for CBW to process the PC continues to be received.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and the present invention shall fall within the protection scope of the present invention as long as the technical effects of the present invention are achieved by the same means. The invention is capable of other modifications and variations in its technical solution and/or its implementation, within the scope of protection of the invention.
Claims (8)
1. A method for solving the problem of disconnection of data copying between a mass storage device and a PC (personal computer) terminal is characterized by comprising the following steps:
s1, when the mass storage device and the PC terminal copy data, a timer is established in the storage device;
s2, when the time of the PC end command processing by the equipment end does not exceed the disconnection threshold value of the PC end, directly sending the CSW, and if the time exceeds the disconnection threshold value, replying the CSW by using a timer;
and S3, clearing the timer after the completion of the reply, and receiving the subsequent operation instruction of the PC terminal.
2. The method according to claim 1, wherein the step S1 further includes:
the data copying sizes of the equipment end and the PC end are detected, if the data to be copied exceed a specified threshold value, a corresponding timer is established for the equipment end, the timing time is set, and the timer needs to be initialized when a command is received.
3. The method as claimed in claim 2, wherein the timer is initialized when the device receives the CBW from the PC.
4. The method as claimed in claim 2, wherein the timing time does not exceed the disconnection threshold of the PC.
5. The method for solving the problem of disconnection of data copy between mass storage device and PC according to claim 4, wherein the disconnection threshold of PC is set to 8-10 s, where 8s is compatibility setting and 9-10 s is general setting.
6. The method according to claim 1, wherein the step S2 further includes:
and the equipment side analyzes the command in the CBW and further executes the corresponding command, if the time of the executed command does not exceed the disconnection threshold value of the PC side, the CSW is replied, and if the time of the executed command exceeds the disconnection threshold value of the PC side, the action of replying the CSW is executed by using a callback function in a timer.
7. The method according to claim 1, wherein the step S3 further includes:
and after the CSW is replied, clearing the timer and continuously receiving the next command of the PC side processed by the CBW.
8. The method for solving the problem of disconnection of the data copy between the mass storage device and the PC side according to any one of claims 1 to 7, wherein the method further comprises:
the data copying between the mass storage device and the PC terminal refers to transmitting the storage data of the mass storage device to the PC terminal through a data connection line, and may also refer to storing the data suitable for the mass storage device to store in the PC terminal to the mass storage device through the data connection line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711083137.8A CN108062281B (en) | 2017-11-07 | 2017-11-07 | Method for solving disconnection of data copying between mass storage device and PC terminal |
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| CN201711083137.8A CN108062281B (en) | 2017-11-07 | 2017-11-07 | Method for solving disconnection of data copying between mass storage device and PC terminal |
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| CN108062281A CN108062281A (en) | 2018-05-22 |
| CN108062281B true CN108062281B (en) | 2020-06-30 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1385794A (en) * | 2001-05-14 | 2002-12-18 | 精工爱普生株式会社 | Data transmission controller, electronic device and data transmission method |
| CN1564001A (en) * | 2004-04-09 | 2005-01-12 | 清华大学 | Portable signal generating method and system based on USB mobile memory tech |
| CN1776588A (en) * | 2004-11-16 | 2006-05-24 | 富士通株式会社 | Information processing system, storage unit,and computer-readable recording medium |
| CN101303685A (en) * | 2007-05-09 | 2008-11-12 | 瑞昱半导体股份有限公司 | Method for improving read-write data speed of all-purpose sequence bus storage equipment |
| US9760730B2 (en) * | 2015-08-28 | 2017-09-12 | Dell Products L.P. | System and method to redirect and unlock software secure disk devices in a high latency environment |
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- 2017-11-07 CN CN201711083137.8A patent/CN108062281B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1385794A (en) * | 2001-05-14 | 2002-12-18 | 精工爱普生株式会社 | Data transmission controller, electronic device and data transmission method |
| CN1564001A (en) * | 2004-04-09 | 2005-01-12 | 清华大学 | Portable signal generating method and system based on USB mobile memory tech |
| CN1776588A (en) * | 2004-11-16 | 2006-05-24 | 富士通株式会社 | Information processing system, storage unit,and computer-readable recording medium |
| CN101303685A (en) * | 2007-05-09 | 2008-11-12 | 瑞昱半导体股份有限公司 | Method for improving read-write data speed of all-purpose sequence bus storage equipment |
| US9760730B2 (en) * | 2015-08-28 | 2017-09-12 | Dell Products L.P. | System and method to redirect and unlock software secure disk devices in a high latency environment |
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