CN103077042A - SD (secure digital) card capable of being subjected to hot plug at any time and embedded type method capable of automatically loading and unloading - Google Patents
SD (secure digital) card capable of being subjected to hot plug at any time and embedded type method capable of automatically loading and unloading Download PDFInfo
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- CN103077042A CN103077042A CN2012104581461A CN201210458146A CN103077042A CN 103077042 A CN103077042 A CN 103077042A CN 2012104581461 A CN2012104581461 A CN 2012104581461A CN 201210458146 A CN201210458146 A CN 201210458146A CN 103077042 A CN103077042 A CN 103077042A
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Abstract
The invention relates to an SD (secure digital) card capable of being subjected to hot plug at any time and an embedded type method capable of automatically loading and unloading. The method comprises the following steps of: (1) inserting an SD card; 2) judging whether the SD card and a card slot are shaken, if so, carrying out a handshake and loading procedure after carrying out delay buffer, and if no, directly carrying out the handshake and loading procedure; and 3) when data is loaded if handshake succeeds again, judging whether a loading process is subjected to abnormal termination or not, if so, exiting the loading, and if not, loading data on the SD card. The invention provides the SD card capable of being subjected to hot plug at any time and the embedded type method capable of automatically loading and unloading, and is characterized in that a user does not need to load or unload, and the user is permitted to insert or remove the SD card into or from the card slot at will at any time.
Description
Technical field
The present invention relates to a kind of can at any time hot-swappable SD card and the automatically embedded methods of loading and unloading.
Background technology
SD card (Secure Digital Memory Card) is widely used in the embedded device.Data on file on the card, for make things convenient for card above part generally all adopt universal document system (such as FAT12, FAT16, FAT32, NTFS, ExFAT, Ext2, Ext3, HFS, HFS+ etc.) that the data file of depositing is carried out storage management at multi-platform mutual files.
Embedded device can go out card by condition discrimination and whether insert state.The SD card inserts the parameter that need to shake hands with identification card, and according to the situation of shaking hands frequency of operation and bottom are set and obtain the information such as card dimensions capacity, file system load document system (the identification file system type, and read MBS, the information such as PBS load partition information etc.).Because reasons such as file system loading and Cache, removing card often needs to select in the embedded device unloading, so that the Cache of release and flush file system, guarantees that the complete data relevant with card writes card to card.So it also is to need to consume the regular hour that the unloading card goes to the card storage because of the Flush data.And inserted with card is because the identification card of will shaking hands, and the load document system, especially large for capacity and the many cards of file that load, and loading procedure needs the regular hour just can finish.Therefore, although removable card does not need not carry out after the shutdown, need loaded down with trivial details selection unloading card, in order to carry out the flush action of cache.
Behind the card data writing, some data is in buffer zone, and the Flush that also is not able to do in time is to card, if this moment, user's physics pulled out card, and cause data among the file system Cache can't Flush to card.
Before unloading is finished, the user generally needs to wait for, physical removal in the uninstall process (pulling out) card, data then might be lost, if the not complete Flush of some important management datas of file system then may cause file system data chaotic (such as a lot of mess code sub-folders of appearance baffled in the file or son file).
Windows XP arranges rapid moving except optimization and two kinds of settings of optimized performance to the disk of USB Mass storage.The data that rapid moving then writes card except optimization directly write card in real time without Cache, although can omit the operation that tray zone removes unloading when can remove card, the writing speed of card (performance) is decrease also.The change of card mode is arranged to interrupt, when card removes or inserts, then can produces relevant plug interrupt notification CPU, and then CPU can process by handling interrupt processing function.But the process of card mechanism inserted with card, " loose contact " appears in card and slot mechanism contact process very easily, it is first conducting in the insertion process, but along with the slip of inserting, of short duration disconnection may appear in the centre, and then being inserted at last the position has the insertion of becoming state, although namely the user is an inserted with card, but because the loose contact of insertion process possibility may produce the fluctuation effect of " inserting--removing--inserts " for hardware.And then in some situation of stroke, although begin to interrupt determining insertion, the relevant card loaded line journey of interrupt response function notice goes to attempt according to the SD card agreement identification card of shaking hands, the result is again because contact is bad to be caused low layer to be shaken hands or thought contact not when reading out data and failure, and then causes loading the card of insertion.
Summary of the invention
In order to solve the above-mentioned technical matters that exists in the background technology, the invention provides a kind of need not that user selection loads and unloading, allow the user arbitrarily at any time from draw-in groove insert or remove the SD card can at any time hot-swappable SD card and the automatically embedded methods of loading and unloading.
Technical solution of the present invention is: the invention provides a kind of can at any time hot-swappable SD card and the automatically embedded methods of loading and unloading, its special character is: described at any time hot-swappable SD card and automatically the embedded methods of loading and unloading may further comprise the steps:
1) inserts the SD card;
2) judge whether SD card and draw-in groove have shake; If then postpone to shake hands again and loading procedure after the buffering; If not, then directly shake hands and loading procedure;
3) shake hands again when successfully afterwards SD being sticked into capable data loading, judge whether loading procedure has unusual interruption; If then withdraw from loading; If not, then the data on the SD card are loaded.
Above-mentioned steps 2) be 300ms～500ms the time delay that postpones to cushion in.
Above-mentioned steps 3) specific implementation is:
3.1) data on the SD card are read or write;
3.2) judge read or ablation process in SD card state; If SD card state is without the card state, then interrupts reading or ablation process, and finish; If SD card state is that the card state is arranged, then the data on the SD card are carried out read or write operation.
Above-mentioned steps 3) also comprise afterwards:
4) carrying out data according to the different types of data on the SD card loads.
Above-mentioned steps 4) different types of data in is the different types of data when writing the SD card.
The above-mentioned data type that writes is the system data of data and the non-file system of file system integrity.
When the above-mentioned data type that writes is the data of file system integrity, to the mode of the data zero-lag of the file system integrity SD card that writes direct.
When the above-mentioned data type that writes is the system data of non-file system, adopt the mode of buffer zone that the automatically whole Flush of the system data of non-file system are write back card; It is the size of the interior data that successfully write of 200ms that described buffer zone allows the data maximum of buffering.
The specific implementation that above-mentioned employing buffer zone writes is: the buffer zone that at first system data of non-file system is write the SD card; Judge that the used time of institute's data writing is whether within the time that buffer zone allows; If then finish ablation process; If not, then the whole Flush of data that prepare to write outside the buffer zone institute permission time are write buffer zone to the data of SD card.
Advantage of the present invention is:
The invention provides a kind of can at any time hot-swappable SD card and the automatically embedded methods of loading and unloading, the method is on the embedded device with support SD card, kept high performance writing speed, can little delay 300-500ms(millisecond even guarantee to have in the insertion process in the situation of fluctuation of loose contact still) after the stable normal card that automatically loads, the test of namely doing writing speed for writeable card after successfully loading writes buffer zone and allows the size of buffer zone to keep certain efficient write performance automatically to calculate card.And entering the each 300ms(millisecond of accurately predicting behind the data writing) after the possible card that pulls out, and automatically writing the 100ms(millisecond) after with the buffer zone remaining data all Flush return card, and writing for card file system of systems data, directly without the card buffer zone, and directly write in real time card, and then avoid power-off illegally or fall card causing the confusion of card file system with unusual, and the realization permission user truly who has realized a kind of energy safety and stability carries out the hot drawing plug-in card in real time, avoid allowing and carry out action and the stand-by period such as loading and unloading on the user UI, and then realize at any time permission user physics plug SD card truly.
Description of drawings
Fig. 1 is that the present invention is at the deferring procedure synoptic diagram of judging that SD card and draw-in groove adopt when whether shake is arranged;
Fig. 2 is the process synoptic diagram that interruption of the present invention is judged;
Fig. 3 is the ablation process synoptic diagram of the data for relating to file system integrity of the present invention;
Fig. 4 is the ablation process synoptic diagram of the system data for relating to non-file system of the present invention.
Embodiment
Contact and half fluctuation that contacts because the draw-in groove physical medium exists for the plug-in card process, might have influence on shake hands identification and the loading of card, so the card that arrives for terminal monitoring inserts, do not load immediately, can after inserting, physics SD card carry out, card loads shakes hands to card after thread specially postpones about 300-500ms again and identifies, shake hands successfully after the file system of loading card.And have the user of permission to pull out at any time card in the loading procedure, when the interruption generation that has card mode to change, the system that arranges at once is without card mode (state that card is pulled out), and stops to load action (loading after avoiding removing in the card loading procedure makes mistakes).The test writing speed calculates the 200ms(millisecond after loading successfully) in can the complete data volume of Flush, write the size of buffer zone (Cache) to be set to card.
The user is (such as a certain affirmation of the complete embedded device UI of manual manipulation) (guaranteeing to preserve or the button etc. of taking pictures) after embedded device is selected to trigger the action that operates toward the card data writing, go draw-in groove to pull out card and from screen, remove hand), mobile hand go the embedded device draw-in groove extract card the centre be to have certain consuming timely, generally have the 300ms(millisecond).The mechanism that automatic card of the present invention loads and unloads, especially mention the Flush mechanism of a kind of Cache, after considering that user's embedded device has the relevant operation of storage, hand moves to the card taking of embedded device groove the consuming time of 300ms, utilizes the card that loads to test the data volume that the card writing speed that obtains calculates the complete size of data maximum that permission is preserved as buffer zone of 200ms energy Flush.In case and countless certificates write in the monitoring 100ms; then whole Flush in the whole 200ms of buffer data are returned card (guaranteeing that the whole Flush of buffered data return card); when the user removed the plug card thus, buffer data was because get back to card with the whole brushes of buffer data in the 300ms.
For the data that affect file system integrity (such as FAT Entry in the FAT file system, the data of DirectoryEntry), if for these untimely cards that is written to, then may cause file system integrity, if file system integrity is made mistakes, may affect then that subsequent file writes (even allowing catalogue mess code occur) and so that system produces unusual.So then without the buffer zone of card, directly write in real time card for system data important in the card File system (can affect the data of file system integrity), avoid abnormal power-down and cause file system data chaotic.And for the data that do not affect file system integrity, just use the buffer zone of card file system.Thus, even if abnormal power-down in the ablation process can not cause card data chaotic yet.And cut off the power supply in certain relevant file data ablation process, also just the part that writes of this writing in files is without renewal at most, but file system does not have file confusion instruments such as (can not need to use carry out the scanning reparation of file system) Scandisk.
According to above-mentioned disclosed method, can realize that embedded device is when using card, do not need the user to participate in selecting to carry out the action that loads (mount) and unloading (unmount), and the interrupt handling routine notice loading and unloading thread that can automatically change according to card mode loads automatically and unloads, what the user data that writes for card still can use file system defines certain capacity size buffer zone Cache, and then guarantees that system still possesses efficient writing speed to the write activity of card.
Inserted with card, the system in the start can identify rapidly and load automatically.In the use procedure, card is fallen in plug, can be to file confusion reigned in the card yet, and can the Self-tipping file system.
The user has the operation (UI is interactive) rear (carrying out the preservation of data such as the software module of save data) of storage action at embedded equipment, hand moves to the operation that draw-in groove reaches card and has at least 300ms(millisecond) consuming time, utilize this 300ms(millisecond) interval time the Cache of the file system of card is designed to the poorest 300ms(millisecond of automatic Flush() in Flush is complete automatically.Inserted with card is considered the fluctuation in contact when inserting draw-in groove, and be designed to certain little delay 300～500ms(millisecond) after automatically load, and then shake hands when avoiding fluctuation on the card mode to automatic loading and the interference when reading out data, and then the loading that assures success.And then realize with certain C ache function (than efficient without the system performance of Cache), but can not need the user to load and unload the selection operation that card carries out any UI, and truly allow at any time hot-swappable (physics plug) SD card, load and need the user to carry out just allowing the physics removable card after the operation on the UI and need not to carry out the card unloading.And then realized a kind of embedded system that allows at any time user's hot-swappable card on embedded device, avoided the contact shakiness of removable card to cause the failure of loading card, because card 200ms(millisecond is still arranged) buffer zone of the size of data can Flush finished, and then can keep writing efficiently speed, and because card file service system data write card in real time, even if abnormal power-down can not cause card data chaotic yet.Advance significant simplification and make things convenient for the hot-swappable use of user SD card.
Insert the processing extract for card, creates a special card file system monitoring thread A, and card plug state is set changes and be arranged to interruption.When having card to insert in real time or to remove (extracting), interrupt respective function and then card mode is informed card file system monitoring thread A, this thread is responsible for automatic loading and the unloading of relevant card.
Referring to Fig. 1, consider inserted with card, card and draw-in groove loose contact (shake) produce repeatedly plug interruption and have influence on normal loading.So specially be designed to inserted with card, thread postpones the 300--500ms(millisecond) formally begin again afterwards the loading of shaking hands.And paste the writing speed of other test card after having loaded (but as creating a written document, test according to scattered and continuous sector writing speed, calculate the 200ms(millisecond) in can successfully be written to the data volume of card, and with the 200ms(millisecond) interior the card population size that can successfully write allows the max cap. that cushions as the card file system buffer.
Carrying out the operation of card data writing on the consideration user embedded device (as takes pictures, certain application program module user clicks save data), and after the user clicked these trigger actions, hand moves to and pulls out card in the embedded device draw-in groove and have certain consuming time, general 300ms(millisecond at least), so take full advantage of this 300ms(millisecond) the card that pulls out postpone, specially be divided into the 200ms(millisecond) the buffer zone max cap., and 100ms(millisecond) the automatically whole Flush of data that automatically trigger buffer zone after write back card, and then the assurance certain writing speed of card (performance), because all 300ms(milliseconds that write) all the Flush of safe and complete write back card, so carry out extra unloading and wait from system when having avoided again the user to unload card, and on experience, have and can feel need not unloading and wait for.
The data that write for card, if relate to the data of file system integrity, this part data card (not passing through buffer zone) that writes direct then, with the important system data of guaranteeing file system write latency can not appear, and then avoid abnormal power-down, perhaps card comes off and causes the card data file system completeness error to occur (because this class mistake may cause card data chaotic, as occurring mess code file or sub-folder in certain file, or cause some file to occur cluster(bunch) overlapping etc.), treatment scheme is as shown in Figure 3.
And for the system data part of the non-file system of card, still can use in a certain size the buffer zone (this buffer zone allows the data maximum of buffering to satisfy the 200ms(millisecond) and can completely write back card.After writing card data, if the 100ms(millisecond) interior countless according to continuing to write toward card, then acquiescence is assert finishing of data writing, and the whole Flush of buffer data are returned card (be ready at any time the user and extract card), as shown in Figure 4.
So, any data that write card in the 300ms, will all write card at the latest.And special design becomes the system data of card file System Dependent, all is to write in real time, even if accident power-off falls card, also can not cause card data chaotic.
Any time is pulled out card, and interrupting arranging in the very first time system is without the card state, and hardware continues the access card and mistake occurs after avoiding pulling out card, as shown in Figure 2 flow process.
Claims (9)
- One kind can at any time hot-swappable SD card and the automatically embedded methods of loading and unloading, it is characterized in that: described at any time hot-swappable SD card and automatically the embedded methods of loading and unloading may further comprise the steps:1) inserts the SD card;2) judge whether SD card and draw-in groove have shake; If then postpone to shake hands again and loading procedure after the buffering; If not, then directly shake hands and loading procedure;3) shake hands again when successfully afterwards SD being sticked into capable data loading, judge whether loading procedure has unusual interruption; If then withdraw from loading; If not, then the data on the SD card are loaded.
- 2. according to claim 1 can at any time hot-swappable SD card and the automatically embedded methods of loading and unloading, it is characterized in that: be 300ms～500ms the time delay that postpones to cushion described step 2).
- 3. according to claim 2 can at any time hot-swappable SD card and the automatically embedded methods of loading and unloading, it is characterized in that: the specific implementation of described step 3) is:3.1) data on the SD card are read or write;3.2) judge read or ablation process in SD card state; If SD card state is without the card state, then interrupts reading or ablation process, and finish; If SD card state is that the card state is arranged, then the data on the SD card are carried out read or write operation.
- According to claim 1 and 2 or 3 described can at any time hot-swappable SD card and the automatically embedded methods of loading and unloading, it is characterized in that: also comprise after the described step 3):4) carrying out data according to the different types of data on the SD card loads.
- 5. according to claim 4 can at any time hot-swappable SD card and the automatically embedded methods of loading and unloading, it is characterized in that: the different types of data in the described step 4) is the different types of data when writing the SD card.
- 6. according to claim 5 can at any time hot-swappable SD card and the automatically embedded methods of loading and unloading, it is characterized in that: the data type of said write is the data of file system integrity and the data storage data of non-file system system data.
- 7. according to claim 6 can at any time hot-swappable SD card and the automatically embedded methods of loading and unloading, it is characterized in that: when the data type of said write is the data of file system integrity, to the mode of the data zero-lag of the file system integrity SD card that writes direct.
- 8. according to claim 6 can at any time hot-swappable SD card and the automatically embedded methods of loading and unloading, it is characterized in that: when the data type of said write is the system data of non-file system, adopt the mode of buffer zone that the automatically whole Flush of the system data of non-file system are write back card; It is the size of the interior data that successfully write of 200ms that described buffer zone allows the data maximum of buffering.
- 9. according to claim 8 can at any time hot-swappable SD card and the automatically embedded methods of loading and unloading, it is characterized in that: the specific implementation that described employing buffer zone writes is: the buffer zone that at first system data of non-file system is write the SD card; Judge that the used time of institute's data writing is whether within the time that buffer zone allows; If then finish ablation process; If not, the data that then data of preparing to write outside the buffer zone institute permission time all are written to the SD card write the card file system buffer.
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Application publication date: 20130501 |