CN105573918A - Light-weight flash memory system and method - Google Patents
Light-weight flash memory system and method Download PDFInfo
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- CN105573918A CN105573918A CN201510955156.XA CN201510955156A CN105573918A CN 105573918 A CN105573918 A CN 105573918A CN 201510955156 A CN201510955156 A CN 201510955156A CN 105573918 A CN105573918 A CN 105573918A
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- G06F12/02—Addressing or allocation; Relocation
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- G06F12/023—Free address space management
- G06F12/0238—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory
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Abstract
The invention provides a light-weight flash memory system. The system comprises an initialization module for initializing the flash memory system, a reading module for accessing system parameter blocks of the flash memory system to acquire data, a write-in module used for accessing the system parameter blocks of the flash memory system to write in data and perform corresponding updating and an erasure module for performing linear access and erasure on data blocks through balanced erasure. The invention further provides a light-weight flash memory method. The light-weight flash memory method comprises steps as follows: initialization of the flash memory system as well as reading, writing-in and erasure of file data. The light-weight flash memory system and method have the benefits as follows: quick light weight is realized due to the embedment characteristic, the system and the method can be used for an embedded system with a few resources due to little memory consumption, and due to the quick read-write operation characteristic, the system and the method are suitable for situations with high requirements for embedment instantaneity.
Description
Technical field
The present invention relates to a kind of lightweight flash memory system and method, belong to computer data and store.
Background technology
RAM is called as random access memory, and it can be read and write at any time, and speed is very fast, usually used as operating system or other are just at the ephemeral data storage medium of active program.
FLASH is the one of storage chip, can be revised the data of the inside by specific program.FLASH often represents the meaning of FlashMemory in electronics and semiconductor applications, namely at ordinary times said " flash memory ".
In some embedded systems, file is needed to be stored in read-write capability.The embedded file system of current existence, such as FATFS, YAFFS.General from PC(WIN or LINUX) amendment optimization.This kind of file system general utility functions are comprehensive, but because not being special is micro embedded design, therefore generally there is operating speed slow, the defects such as resource consumption is many.Therefore resource is difficult to few, the embedded system that requirement of real-time is high.
Summary of the invention
For prior art in micro embedded system, use universal document system to have shortcoming: efficiency is low, operating speed is slow, and system consumption is large.Technical method of the present invention discloses a kind of lightweight flash memory system and method, be applied to the flash memory file system of million ranks, designed and developed quick light weight file system, file system can be used on the micro embedded equipment of scarcity of resources, and efficiency is high, operation is fast.
A kind of lightweight flash memory system of technical scheme of the present invention, it is characterized in that, this system comprises: initialization module, initialization is carried out to flash memory system, flash memory system is divided into main system parameter block, backup parameter block, data block, the block divided is continuous print block, and sets up a memory ram for storing main system parameter block; Read module, according to filename, carries out poll to the main system parameter under memory ram, obtains corresponding fileinfo, and reads according to fileinfo; Writing module, according to filename, carries out poll to the main system parameter under memory ram, obtains corresponding fileinfo, and writes according to fileinfo, and carries out correspondence amendment to the main system parameter under memory ram; Continuous blocks, based on the continuous blocks that flash memory system divides, are saved to block management space, carry out linear increment operation, and carry out real-time query free block under memory ram, and realize the erasing to free block to the continuous blocks of flash memory system by erasing module.
According to described lightweight flash memory system, described initialization module comprises: block divides module, flash memory system is divided into main system parameter block, backup parameter block, data block, wherein data block is made up of multiple sub-block, the block of described division is continuous print, also for main system parameter block is divided into file management region, block management area, last time erasable block number, wherein file management region comprises filename, blocks of files index, file size, and block management area comprises block identification and block check; Memory ram administration module, a memory ram space is created when flash memory system initialization, for main system parameter is read memory ram space, also for setting up the index of fileinfo and block message, and described read module, writing module, erasing module is carrying out the inquiry of fileinfo to all needing to access memory ram space when file access and/or amendment; Backup module, for when the main system parameter block in described memory ram space changes, automatically the parameter of renewal part is updated in backup parameter block, deletes corresponding old parameter simultaneously, consistent with backup parameter block for the main system parameter of preserving memory ram space.
According to described lightweight flash memory system, described read module comprises: contrast module, to the file management parameter under the memory ram administration module of described initialization module, compares to filename, if match file, and backspace file information; Enquiry module, the described fileinfo returned is resolved, obtain document number, file header and file size is obtained from described file management region according to acquisition document number, wherein file header comprises data block number, data block number comprises fileinfo index, obtains respective file data and arrange according to fileinfo index; Read module, after arranging described enquiry module file data, file reading data offset, the block number of calculation document data, reads corresponding blocks file corresponding data.
According to described lightweight flash memory system, described writing module comprises: contrast module, to the file management parameter under the memory ram administration module of described initialization module, compares to filename, if match file, and backspace file information; Enquiry module, resolves the described fileinfo returned, and obtains document number, and obtain file header and file size according to acquisition document number from described file management region, wherein file header comprises data block number, and data block number comprises fileinfo index,
Obtain respective file data according to fileinfo index and arrange; Writing module, after arranging described enquiry module file data, file reading data offset, the block number of calculation document data, writes corresponding blocks number by file data, if the block space of store file data is not enough, then applies for new block.Update module, for said write module to file data modify cause backup parameter block parameter and memory ram space under main system parameter block inconsistent time, file management block under main system parameter block is upgraded, and then is updated to consistent with main system parameter block to parameter under described backup parameter block.
According to described lightweight flash memory system, described erasing module also comprises: by the reading to erasable block number described last time, obtain the block number of write last time, and then inquire about the next block of this block number, if this block is busy piece, continue next inquiry, until inquire free block, and perform erasing to free block, then perform the Data Update performed by update module under said write module, and the renewal rewards theory to erasable block number last time.
Technical scheme of the present invention also comprises a kind of lightweight flash memory method, the method comprises: carry out initialization to flash memory system, flash memory system is divided into main system parameter block, backup parameter block, data block, the block divided is continuous print block, and sets up a memory ram for storing main system parameter block; According to filename, poll is carried out to the main system parameter under memory ram, obtain corresponding fileinfo, and read according to fileinfo; According to filename, poll is carried out to the main system parameter under memory ram, obtain corresponding fileinfo, and write according to fileinfo, and correspondence amendment is carried out to the main system parameter under memory ram; Based on the continuous blocks that flash memory system divides, continuous blocks are saved to block management space, linear increment operation are carried out to the continuous blocks of flash memory system, and carry out real-time query free block under memory ram, and realize the erasing to free block.
Further, the method also comprises: flash memory system is divided into main system parameter block, backup parameter block, data block, wherein data block is made up of multiple sub-block, the block of described division is continuous print, also for main system parameter block is divided into file management region, block management area, last time erasable block number, wherein file management region comprises filename, blocks of files index, file size, and block management area comprises block identification and block check; A memory ram space is created when flash memory system initialization, for main system parameter is read memory ram space, also for setting up the index of fileinfo and block message, and described read module, writing module, erasing module is carrying out the inquiry of fileinfo to all needing to access memory ram space when file access and/or amendment; When the main system parameter block in described memory ram space changes, automatically the parameter of renewal part is updated in backup parameter block, deletes corresponding old parameter simultaneously, consistent with backup parameter block for the main system parameter of preserving memory ram space.
Further, the method also comprises: to the file management parameter under the memory ram administration module of described initialization module, compare to filename, if match file, and backspace file information; Resolve the described fileinfo returned, obtain document number, obtain file header and file size according to acquisition document number from described file management region, wherein file header comprises data block number, and data block number comprises fileinfo index,
Obtain respective file data according to fileinfo index and arrange; After arranging described enquiry module file data, file reading data offset, the block number of calculation document data, reads corresponding blocks file corresponding data.
Further, the method also comprises: to the file management parameter under the memory ram administration module of described initialization module, compare to filename, if match file, and backspace file information; The described fileinfo returned is resolved, obtain document number, file header and file size is obtained from described file management region according to acquisition document number, wherein file header comprises data block number, data block number comprises fileinfo index, obtains respective file data and arrange according to fileinfo index; After arranging described enquiry module file data, file reading data offset, the block number of calculation document data, writes corresponding blocks number by file data, if the block space of store file data is not enough, then applies for new block.For said write module to file data modify cause backup parameter block parameter and memory ram space under main system parameter block inconsistent time, file management block under main system parameter block is upgraded, and then is updated to consistent with main system parameter block to parameter under described backup parameter block.
Further, the method also comprises: by the reading to erasable block number described last time, obtain the block number of write last time, and then inquire about the next block of this block number, if this block is busy piece, continue next inquiry, until inquire free block, and perform erasing to free block, then perform the Data Update performed by update module under said write module, and the renewal rewards theory to erasable block number last time.
Beneficial effect of the present invention is: embedded characteristic, achieves quick lightweight, because memory consumption is little, can be used for the embedded system that resource is few, its fast reading and writing operating characteristic, can meet embedded requirement of real-time high field and close.
Accompanying drawing explanation
Figure 1 shows that the overview flow chart according to embodiment of the present invention;
Figure 2 shows that the flash memory system overall construction drawing of embodiment of the present invention;
Fig. 3 a is depicted as the detailed system composition diagram according to embodiment of the present invention;
Fig. 3 b is depicted as the detailed system parameter block figure according to embodiment of the present invention;
According to the detail file control chart of embodiment of the present invention shown in Fig. 3 c;
Fig. 3 d is depicted as the detailed block control chart according to embodiment of the present invention.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, describe the present invention below in conjunction with the drawings and specific embodiments.A kind of lightweight flash memory system of the present invention and method are applied to and store in file, do not need the global function that similar PC is the same.Therefore, technical method of the present invention can design according to embedded requirement.PC is used to the memory device of hard disk, embedded system uses FLASH, and therefore file system can carry out particular design according to the singularity of FLASH.
Figure 1 shows that the overview flow chart according to embodiment of the present invention, comprise flash memory system initialization, file reads and write, and file data erasing.Concrete enforcement is as shown in S101 ~ S104:
Wherein S101 specifically comprises,
(1) when file system initialization, need to set up file system on FLASH continuous blocks.Choose wherein two pieces as systematic parameter block, all the other blocks are data block.Two block system parameter blocks one piece as main system parameter block, other one piece as standby system parameter block, after main system parameter block is made mistakes, use standby system parameter block to recover main system parameter block;
(2) when system initialization, the RAM in one piece of 4K space is opened up in programming system inside, main system parameter block on FLASH is read in RAM, after this All Files Dynamic System needs acquisition filesystem information to go not obtain from RAM, as everyone knows, RAM operating speed is greatly faster than FLASH operating speed;
(3) when main system parameter block in RAM has renewal, RAM file system correlation parameter backups on FLASH by file system, and deletes original system parameter block, can ensure that the upper systematic parameter of RAM and FLASH is synchronous.
S102 specifically comprises,
(1) according to filename, systematic parameter block file management area in wheel inquiry RAM, comparison document name, if any matching files, then backspace file number;
(2) according to document number, file first blocks of data block in file management region number and file size is obtained;
(3) according to the block number got, extract all data block number of presents from block management area, arrange by document order;
(4) according to reading of content skew, calculate and read block number, from file corresponding blocks, read data.
S103 specifically comprises,
(1) according to filename, systematic parameter block file management area in wheel inquiry RAM, comparison document name, if any matching files, then backspace file number.
(2) according to document number, file first blocks of data block in file management region number and file size is obtained.
(3) according to the block number got, extract all data block number of presents from block management area, arrange by document order.
(4) according to writing offset address, calculating block number, file is write corresponding blocks number, as needed new block, then applying for new block.
(5) the systematic parameter block block directorial area in RAM is upgraded.
(6) the block system parameter block file management area in RAM is upgraded.
(7) the block system parameter block in RAM is synchronized on FLASH.
S104 specifically comprises,
All block messages are kept at a continuous print block management space, be linear increment operation, and inquire about in RAM in real time when inquiring about free block.Relative to other at every turn from for corresponding FLASH block reading state, speed is quite fast.
Figure 2 shows that the flash memory system overall construction drawing of embodiment of the present invention.Comprising systematic parameter block, standby system parameter block, data block, concrete systematic parameter block comprises last erasable block number, file management and block management, block management comprises block identification and exclusive or check, and file management comprises filename, file identification and file size
Fig. 3 a is depicted as the detailed system composition diagram according to embodiment of the present invention.Comprise file management parameter and block management parameters, last time erasable block number.
Fig. 3 b is depicted as the detailed system parameter block figure according to embodiment of the present invention; According to embedded system, the systematic parameter (similar hard disk index area) of presents system is kept on the FLASH block of one piece of 4K size, namely say systematic parameter block before, it comprises key content has: file management parameter and block management parameters, last time erasable block number.Preserve a block system parameter block in RAM, file system operation speed can be accelerated.Operation file uses RAM intrinsic parameter, instead of the parameter on hard disk.During close file operation, RAM parameter is updated to hard disk.When powering on, parameter on hard disk is read in RAM parameter block.
According to the detail file control chart of embodiment of the present invention shown in Fig. 3 c.File management region comprises key parameter to be had: filename, file identification, file size.
Fig. 3 d is depicted as the detailed block control chart according to embodiment of the present invention.Based on Fig. 3 c, block management area comprises the parameter of all pieces of whole file system, has a block mark to each block, block check and.Block mark has two to do use, and 1 is for showing this bulk state, and 2 is belong to file data blocks when this block, and is in when using and write full, for connecting next blocks of files.Last erasable block number in block management area and systematic parameter block completes all pieces of management functions of file system jointly.As 1) ~ 2) shown in:
1) block of presents system is continuous print, when the new block of needs one preserves data, according to last erasable block N, forward mobile enquiry free block, carries out corresponding operating, and upgrade block mark after inquiring free block.
2) used block to adhere to different file separately, unified file uses block mark to form an individual event chained list.
The advantage following 1 of mode of the present invention) ~ 4) shown in:
1) dapper file system parameter block.File system parameter block is designed to this programme marrow, according to embedded demand, All Files system and block is managed and deposits in the FLASH block of a 4K, support other exquisite designs of presents system.
2) the inter-sync systematic parameter block of RAM.Get parms and to obtain from RAM, relative to each for the file that FLASH obtains fileinfo, speed is quite quick.A reading and writing of files operation can reach FLASH read or write speed substantially.
3) systemic circulation erasure balance design fast.FLASH has erasable number of times to limit, and equilibrium is erased to file system and must considers a problem, and because presents system is based upon on continuous FLASH block, the systemic circulation of this programme therefore can be utilized to inquire about free block and realize balanced erasing.All block messages are kept at a continuous print block management space, be linear increment operation, and inquire about in RAM in real time when inquiring about free block.Relative to other at every turn from for corresponding FLASH block reading state, speed is quite fast.
4) very little memory consumption.Presents system only needs to consume 4K global variable.
The above, just preferred embodiment of the present invention, the present invention is not limited to above-mentioned embodiment, as long as it reaches technique effect of the present invention with identical means, all should belong to protection scope of the present invention.In protection scope of the present invention, its technical scheme and/or embodiment can have various different modifications and variations.
Claims (10)
1. a lightweight flash memory system, is characterized in that, this system comprises:
Initialization module, carries out initialization to flash memory system, and flash memory system is divided into main system parameter block, backup parameter block, data block, the block divided is continuous print block, and sets up a memory ram for storing main system parameter block;
Read module, according to filename, carries out poll to the main system parameter under memory ram, obtains corresponding fileinfo, and reads according to fileinfo;
Writing module, according to filename, carries out poll to the main system parameter under memory ram, obtains corresponding fileinfo, and writes according to fileinfo, and carries out correspondence amendment to the main system parameter under memory ram;
Continuous blocks, based on the continuous blocks that flash memory system divides, are saved to block management space, carry out linear increment operation, and carry out real-time query free block under memory ram, and realize the erasing to free block to the continuous blocks of flash memory system by erasing module.
2. lightweight flash memory system according to claim 1, is characterized in that, described initialization module comprises:
Block divides module, flash memory system is divided into main system parameter block, backup parameter block, data block, wherein data block is made up of multiple sub-block, the block of described division is continuous print, also for main system parameter block is divided into file management region, block management area, last time erasable block number, wherein file management region comprises filename, blocks of files index, file size, and block management area comprises block identification and block check;
Memory ram administration module, a memory ram space is created when flash memory system initialization, for main system parameter is read memory ram space, also for setting up the index of fileinfo and block message, and described read module, writing module, erasing module is carrying out the inquiry of fileinfo to all needing to access memory ram space when file access and/or amendment;
Backup module, for when the main system parameter block in described memory ram space changes, automatically the parameter of renewal part is updated in backup parameter block, deletes corresponding old parameter simultaneously, consistent with backup parameter block for the main system parameter of preserving memory ram space.
3. lightweight flash memory system according to claim 1, is characterized in that, described read module comprises:
Contrast module, to the file management parameter under the memory ram administration module of described initialization module, compares to filename, if match file, and backspace file information;
Enquiry module, resolves the described fileinfo returned, and obtains document number, and obtain file header and file size according to acquisition document number from described file management region, wherein file header comprises data block number, and data block number comprises fileinfo index,
Obtain respective file data according to fileinfo index and arrange;
Read module, after arranging described enquiry module file data, file reading data offset, the block number of calculation document data, reads corresponding blocks file corresponding data.
4. lightweight flash memory system according to claim 1, is characterized in that, described writing module comprises:
Contrast module, to the file management parameter under the memory ram administration module of described initialization module, compares to filename, if match file, and backspace file information;
Enquiry module, resolves the described fileinfo returned, and obtains document number, and obtain file header and file size according to acquisition document number from described file management region, wherein file header comprises data block number, and data block number comprises fileinfo index,
Obtain respective file data according to fileinfo index and arrange;
Writing module, after described enquiry module file data is arranged, file reading data offset, the block number of calculation document data, writes corresponding blocks number by file data, if the block space of store file data is not enough, then applies for new block;
Update module, for said write module to file data modify cause backup parameter block parameter and memory ram space under main system parameter block inconsistent time, file management block under main system parameter block is upgraded, and then is updated to consistent with main system parameter block to parameter under described backup parameter block.
5. lightweight flash memory system according to claim 1, is characterized in that, described erasing module also comprises:
By the reading to erasable block number described last time, obtain the block number of write last time, and then inquire about the next block of this block number, if this block is busy piece, continue next inquiry, until inquire free block, and perform the erasing to free block, then the Data Update performed by update module under said write module is performed, and the renewal rewards theory to erasable block number last time.
6. a lightweight flash memory method, is characterized in that, the method comprises:
Carry out initialization to flash memory system, flash memory system is divided into main system parameter block, backup parameter block, data block, the block divided is continuous print block, and sets up a memory ram for storing main system parameter block;
According to filename, poll is carried out to the main system parameter under memory ram, obtain corresponding fileinfo, and read according to fileinfo;
According to filename, poll is carried out to the main system parameter under memory ram, obtain corresponding fileinfo, and write according to fileinfo, and correspondence amendment is carried out to the main system parameter under memory ram;
Based on the continuous blocks that flash memory system divides, continuous blocks are saved to block management space, linear increment operation are carried out to the continuous blocks of flash memory system, and carry out real-time query free block under memory ram, and realize the erasing to free block.
7. lightweight flash memory method according to claim 6, it is characterized in that, the method also comprises:
Flash memory system is divided into main system parameter block, backup parameter block, data block, wherein data block is made up of multiple sub-block, the block of described division is continuous print, also for main system parameter block is divided into file management region, block management area, last time erasable block number, wherein file management region comprises filename, blocks of files index, file size, and block management area comprises block identification and block check;
A memory ram space is created when flash memory system initialization, for main system parameter is read memory ram space, also for setting up the index of fileinfo and block message, and described read module, writing module, erasing module is carrying out the inquiry of fileinfo to all needing to access memory ram space when file access and/or amendment;
When the main system parameter block in described memory ram space changes, automatically the parameter of renewal part is updated in backup parameter block, deletes corresponding old parameter simultaneously, consistent with backup parameter block for the main system parameter of preserving memory ram space.
8. lightweight flash memory method according to claim 6, it is characterized in that, the method also comprises:
To the file management parameter under the memory ram administration module of described initialization module, filename is compared, if match file, backspace file information;
Resolve the described fileinfo returned, obtain document number, obtain file header and file size according to acquisition document number from described file management region, wherein file header comprises data block number, and data block number comprises fileinfo index,
Obtain respective file data according to fileinfo index and arrange;
After arranging described enquiry module file data, file reading data offset, the block number of calculation document data, reads corresponding blocks file corresponding data.
9. lightweight flash memory method according to claim 6, it is characterized in that, the method also comprises:
To the file management parameter under the memory ram administration module of described initialization module, filename is compared, if match file, backspace file information;
Resolve the described fileinfo returned, obtain document number, obtain file header and file size according to acquisition document number from described file management region, wherein file header comprises data block number, and data block number comprises fileinfo index,
Obtain respective file data according to fileinfo index and arrange;
After described enquiry module file data is arranged, file reading data offset, the block number of calculation document data, writes corresponding blocks number by file data, if the block space of store file data is not enough, then applies for new block;
For said write module to file data modify cause backup parameter block parameter and memory ram space under main system parameter block inconsistent time, file management block under main system parameter block is upgraded, and then is updated to consistent with main system parameter block to parameter under described backup parameter block.
10. lightweight flash memory method according to claim 6, it is characterized in that, the method also comprises:
By the reading to erasable block number described last time, obtain the block number of erasing last time, and then inquire about the next block of this block number, if this block is busy piece, continue next inquiry, until inquire free block, and perform the erasing to free block, then the Data Update performed by update module under said write module is performed, and the renewal rewards theory to erasable block number last time.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108255740A (en) * | 2017-12-07 | 2018-07-06 | 深圳市中易通安全芯科技有限公司 | A kind of FLASH equilibriums erasing-writing method and system |
| CN108399047A (en) * | 2017-02-06 | 2018-08-14 | 中兴通讯股份有限公司 | A kind of flash memory file system and its data managing method |
| CN108932107A (en) * | 2017-05-29 | 2018-12-04 | 爱思开海力士有限公司 | Data storage device and its operating method |
| CN109656881A (en) * | 2018-12-26 | 2019-04-19 | 山东华辰泰尔信息科技股份有限公司 | A kind of method and system for realizing file dynamic management based on FAT16 technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108399047A (en) * | 2017-02-06 | 2018-08-14 | 中兴通讯股份有限公司 | A kind of flash memory file system and its data managing method |
| CN108399047B (en) * | 2017-02-06 | 2022-11-29 | 中兴通讯股份有限公司 | Flash memory file system and data management method thereof |
| CN108932107A (en) * | 2017-05-29 | 2018-12-04 | 爱思开海力士有限公司 | Data storage device and its operating method |
| CN108932107B (en) * | 2017-05-29 | 2021-06-25 | 爱思开海力士有限公司 | Data storage device and operation method thereof |
| CN108255740A (en) * | 2017-12-07 | 2018-07-06 | 深圳市中易通安全芯科技有限公司 | A kind of FLASH equilibriums erasing-writing method and system |
| CN109656881A (en) * | 2018-12-26 | 2019-04-19 | 山东华辰泰尔信息科技股份有限公司 | A kind of method and system for realizing file dynamic management based on FAT16 technology |
| CN109656881B (en) * | 2018-12-26 | 2023-06-20 | 山东华辰泰尔信息科技股份有限公司 | Method and system for realizing dynamic file management based on FAT16 technology |
| CN111258922A (en) * | 2020-01-14 | 2020-06-09 | 深圳天邦达科技有限公司 | Reading method and device of threshold parameter |
| CN111258922B (en) * | 2020-01-14 | 2023-10-27 | 深圳天邦达科技有限公司 | Method and device for reading threshold parameters |
| CN113282521A (en) * | 2021-05-19 | 2021-08-20 | 武汉天喻信息产业股份有限公司 | Method and device for prolonging service life of smart card |
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Application publication date: 20160511 |