CN108228095A - A kind of method that real time information record is carried out based on Flash - Google Patents
A kind of method that real time information record is carried out based on Flash Download PDFInfo
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- CN108228095A CN108228095A CN201711360567.XA CN201711360567A CN108228095A CN 108228095 A CN108228095 A CN 108228095A CN 201711360567 A CN201711360567 A CN 201711360567A CN 108228095 A CN108228095 A CN 108228095A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0604—Improving or facilitating administration, e.g. storage management
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0608—Saving storage space on storage systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0638—Organizing or formatting or addressing of data
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0638—Organizing or formatting or addressing of data
- G06F3/0644—Management of space entities, e.g. partitions, extents, pools
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0673—Single storage device
- G06F3/0679—Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
- Techniques For Improving Reliability Of Storages (AREA)
Abstract
The invention belongs to embedded computer application technologies, and in particular to a kind of real time information recording method based on Flash.Information is recorded as unit of data item, and data item is divided into null record item, starts four type of item of information, real time information item and void item.The adjacent sector composition interblock in two addresses is chosen in FLASH spaces, using the recording mode of two sector switchs, it is ensured that newest record information is always preserved in interblock without being completely erased.Buffering area is set at the end of each sector, cooperation initialization searching algorithm had both avoided progress erasing operation in the process of running and interference program performs, and also ensured that once upper electricity operation there are enough spatial registration real time information.The invention is real-time, and versatility is good, can save the cost for purchasing external EEPROM, has certain positive effect to the miniaturization of embedded system.The method is applied in certain automatically controlled excavator, loader control unit, and stable and reliable operation achieves good effect.
Description
Technical field
The invention belongs to embedded computer application technologies, and in particular to a kind of real time information record side based on Flash
Method.
Background technology
In navigation, fly in the operational process of the embedded systems such as control, servo, generally require in nonvolatile storage in real time
Some information are recorded, such as start information, parameter and fault message.Electrically erasable programmable read-only memory (EEPROM) is because of it
The flexibility used causes it to be very suitable for preserving above- mentioned information, is widely used in all kinds of embedded systems.
Due to unprecedented efficiently integrated performance, system on chip (System On a Chip) has become current microelectronics core
The inexorable trend of piece development, is more and more applied in the embedded systems such as automotive electronics, SERVO CONTROL.Many systems on chip
There is no EEPROM in integration slice, but be integrated with Flash in piece and be used for storing non-volatile program and data.It realizes based in piece
Flash storage carries out real time information record, can save the cost for purchasing external EEPROM, and to the small-sized of embedded system
Positive effect is played in change.
Since Flash is different from the hardware realization mechanism of EEPROM, mode of operation is also different.EEPROM can be using position as list
Position programming, does not need to erasing operation.The position of FLASH can only become 0 from 1, it is impossible to which covering programming must be wiped first before programming
It removes, and can only be by sector erasing.Frequently erasing can shorten the service life of Flash, increase the time of data write-in.Due to
The difference of these modes of operation realizes that real time information record is needed using different methods in Flash.
Invention content
The purpose of the present invention is：The embedded system of FLASH is integrated with for not integrated EEPROM, one kind is provided and is based on
The method that Flash carries out real time information record.
The technical solution that the present invention takes：
A kind of method that real time information record is carried out based on Flash, is included the following steps：
A kind of 1. method that real time information record is carried out based on Flash, which is characterized in that include the following steps：
Step 1：The data structure and type of data item are defined, data item is by data item mark, data item content, data item
Three parts composition is verified, data item is divided by four types according to data item mark：Null record item starts item of information, is real-time
Item of information and void item, the data items length of four type are identical；
Step 2：The selection of FLASH sectors and space divide, and the adjacent set of sectors in two addresses is chosen in FLASH spaces
Into data recorded area, the fixed length space of each sector end is set as buffering area；
Step 3：The initialization retrieval of data recorded area, system electrification retrieves entire data recorded area when initializing, to obtain
Taking currently can write address and newest startup item of information address；
Step 4：Start the write-in of item of information, after data recorded area initialization retrieval, carry out one-shot item of information
Write operation；
Step 5：The write-in of real time information item carries out the write operation of real time information item in system operation；
Step 6：The reading of data item, any time upon power-up of the system read data item at specified address.
2. a kind of method that real time information record is carried out based on Flash according to claim 1, which is characterized in that
The step 3 specifically includes following steps：
Step 3.1 is by currently can write address and the newest starting point for starting item of information address and being initialized as first sector
Current search terms address initialization is first sector-start-address by location；
Step 3.2 inquires the data item mark of current search terms, judges whether current search terms are null record item, if
It is to perform step 3.3, if not, performing 3.4；
Whether in the buffer step 3.3 judges current search terms, if so, another sector is wiped, by this sector
Remaining space be written void item, by the first address of another sector be set to currently can write address, if not, perform step 3.5；
Step 3.4 judges whether currentitem is to start item of information, believes if so, current search address is set to newest start
Item address is ceased, updates current search address for next data items addresses, returns to the execution of step 3.2 place, if not, update is current
Search address is next data items addresses, returns to the execution of step 3.2 place；
Step 3.5 judges whether the next item down of current search terms is null record item, if so, current search terms address is put
For currently can write address, if not, putting recording areas Reflector, wipe this sector, this sector-start-address be set to and currently may be used
Write address；
If step 3.6 does not retrieve null record item in entire recording areas, recording areas Reflector, erasing first are put
A sector, first sector-start-address is set to currently can write address.
3. a kind of method that real time information record is carried out based on Flash according to claim 1, which is characterized in that
The step 4 specifically includes following steps：
The startup information that step 4.1 records when obtaining the initialization of last time system electrification at newest startup item of information address
；
The startup item of information recorded during step 4.2 processing last time system electrification initialization, it is initial to generate this system electrification
The startup item of information of change, and be written into currently can at write address, update currently can write address be next data items addresses.
4. a kind of method that real time information record is carried out based on Flash according to claim 1, which is characterized in that
The step 5 specifically includes following steps：
Judge currently can write address whether be this sector the last one data items addresses, if so, no longer write-in is real-time
Item of information directly returns；If it is not, then to can currently be written real time information item at write address, update currently can be under write address be
One data items addresses.
5. a kind of method that real time information record is carried out based on Flash according to claim 1, which is characterized in that
The step 6 specifically includes following steps：
Step 6.1 judges whether this data item is null record item or invalid information item according to data item mark, if so, returning
Make the return trip empty item or void item mark, if not, performing step 6.2；
Step 6.2 verifies data item, and current data item content is returned when verifying successfully and reads Success Flag, school
Back-checking failure flags when testing unsuccessfully.
The present invention has the advantage that and advantageous effect：
Using the recording mode of two sector switchs, ensure to preserve in interblock under normal circumstances newest
Information is recorded without being completely erased；The length of buffering area represents each recordable maximum data item number of system operation,
The setting collocation recording areas initialization search method of buffering area, both can will likely erasing operation when being advanced to power-up initializing
It carries out, avoids carrying out erasing operation in the process of running and interference program normally performs, and can be ensured that primary system operation has
Enough spatial registration real time information.
The invention is real-time, and versatility is good, the cost for purchasing external EEPROM can be saved, to the small of embedded system
Type has certain positive effect.The method is applied in certain automatically controlled excavator, loader control unit, it is stable can
It leans on, achieves good effect.
Description of the drawings
Fig. 1 is that the real time information recording method based on FLASH records space schematic diagram；
Fig. 2 initializes retrieval flow figure for data recorded area；
Flow chart is written for real time information item in Fig. 3；
Fig. 4 reads flow chart for data item.
Specific embodiment
With reference to shown in attached drawing 1,2,3,4, the development board based on MPC5644 processors is chosen as embodiment, in MPC5644 pieces
The Flash of 2M Bytes is integrated with, the sector that two of which address is adjacent, is of convenient length is chosen and carries out real time information record.This
The specific implementation step of invention is as follows：
Step 1)：Define the data structure and type of data item.Data item is by data item mark (first byte), data item
Hold, data item verification (trail byte) three parts composition.Data item is divided by four types according to data item mark：Null record item
(0xFF), start item of information (0x55), real time information item (0xAA) and void item (0x00).The data item of four type
Length is identical, and is 4 integral multiple.
Step 2)：The selection of FLASH sectors and space divide.Two adjacent fans of middle selection in FLASH spaces
Area --- sector L8, sector L9 composition datas recording areas.Each sector-size is 64K Bytes, by the last of each sector
8K Bytes are set as buffering area, and the space schematic diagram in FLASH is as shown in Figure 1.
Step 3)：The initialization retrieval of data recorded area.System electrification retrieves entire data recorded area when initializing, to obtain
Taking currently can write address CUR_ADDR and newest startup item of information address ST_INFO_ADDR.Retrieval flow is as shown in Fig. 2, be divided into
6 steps below.
CUR_ADDR and ST_INFO_ADDR is initialized as the initial address of first sector by step 3.1), will be current
Search terms address initialization is first sector-start-address.
Step 3.2) inquires the data item mark of current search terms, judges whether current search terms are null record item.If
It is to perform step 3.3).If not, it performs 3.4).
Whether in the buffer step 3.3) judges current search terms, if so, another sector is wiped, by this sector
Void item is written in remaining space, and the first address of another sector is set to CUR_ADDR.If not, perform step 3.5.
Step 3.4) judges whether currentitem is to start item of information, if so, current search address is set to ST_INFO_
ADDR updates current search address for next data items addresses, returns to the execution of step 3.2 place.If not, the current retrieval of update
Address is next data items addresses, returns to the execution of step 3.2 place.
Step 3.5) judges whether the next item down of current search terms is null record item.If so, by current search terms address
It is set to CUR_ADDR.If not, putting recording areas Reflector, this sector is wiped, this sector-start-address is set to CUR_ADDR.
If not retrieving null record item in the entire recording areas of step 3.6), recording areas Reflector is put, erasing the
First sector-start-address is set to CUR_ADDR by one sector.
Step 4)：Start the write-in of item of information.After data recorded area initialization retrieval, one-shot item of information is carried out
Write operation.The startup item of information recorded during the initialization of last time system electrification is obtained at ST_INFO_ADDR, is generated after processing
The startup item of information of this system electrification initialization, and be written at CUR_ADDR addresses, update CUR_ADDR is next
A data items addresses.
Step 5)：The write-in of real time information item.Carry out the write-in of real time information item as needed in system operation
Operation.Real time information item write operation flow as shown in figure 3, write-in before first judge CUR_ADDR whether be this sector last
A data items addresses if so, real time information item is no longer written, directly return.It is if it is not, then real-time to write-in at CUR_ADDR
Item of information, update CUR_ADDR are next data items addresses.
Step 6)：The reading of data item.Any time upon power-up of the system, as needed from particular address READ_
At ADDR read data item, data item read flow as shown in figure 4, first according to data item mark judge this data item whether be
Null record item or invalid information item, if so, returning to null term or void item mark.If not, being verified to data item, verify
Returned data item content and reading Success Flag, back-checking failure flags when verification fails during success.
Claims (5)
- A kind of 1. method that real time information record is carried out based on Flash, which is characterized in that include the following steps：Step 1：The data structure and type of data item are defined, data item is verified by data item mark, data item content, data item Three parts form, and data item is divided into four types according to data item mark：Null record item starts item of information, real time information Item and void item, the data items length of four type are identical；Step 2：The selection of FLASH sectors and space divide, and the adjacent sector composition number in two addresses is chosen in FLASH spaces According to recording areas, the fixed length space of each sector end is set as buffering area；Step 3：The initialization retrieval of data recorded area, system electrification are retrieved entire data recorded area when initializing, are worked as to obtain Before can write address and newest startup item of information address；Step 4：Start the write-in of item of information, after data recorded area initialization retrieval, carry out the write-in of one-shot item of information Operation；Step 5：The write-in of real time information item carries out the write operation of real time information item in system operation；Step 6：The reading of data item, any time upon power-up of the system read data item at specified address.
- 2. a kind of method that real time information record is carried out based on Flash according to claim 1, which is characterized in that described Step 3 specifically includes following steps：Step 3.1 by currently can write address and the newest initial address for starting item of information address and being initialized as first sector, It is first sector-start-address by current search terms address initialization；Step 3.2 inquires the data item mark of current search terms, judges whether current search terms are null record item, if so, holding Row step 3.3, if not, performing 3.4；Whether in the buffer step 3.3 judges current search terms, if so, another sector is wiped, by this sector residue Space be written void item, by the first address of another sector be set to currently can write address, if not, perform step 3.5；Step 3.4 judges whether currentitem is to start item of information, if so, current search address is set to newest startup item of information Address updates current search address for next data items addresses, returns to the execution of step 3.2 place, if not, the current retrieval of update Address is next data items addresses, returns to the execution of step 3.2 place；Step 3.5 judges whether the next item down of current search terms is null record item, works as if so, current search terms address is set to Before can write address, if not, putting recording areas Reflector, wipe this sector, this sector-start-address be set to current writeable Location；If step 3.6 does not retrieve null record item in entire recording areas, recording areas Reflector is put, wipes first fan Area, first sector-start-address is set to currently can write address.
- 3. a kind of method that real time information record is carried out based on Flash according to claim 1, which is characterized in that describedStep 4 specifically includes following steps：The startup item of information that step 4.1 records when obtaining the initialization of last time system electrification at newest startup item of information address；The startup item of information recorded during step 4.2 processing last time system electrification initialization, generates the initialization of this system electrification Start item of information, and be written into currently can at write address, update currently can write address be next data items addresses.
- 4. a kind of method that real time information record is carried out based on Flash according to claim 1, which is characterized in that describedStep 5 specifically includes following steps：Judge currently can write address whether be this sector the last one data items addresses, if so, real time information is no longer written , directly return；If it is not, then to can currently be written real time information item at write address, update currently can write address be next Data items addresses.
- 5. a kind of method that real time information record is carried out based on Flash according to claim 1, which is characterized in that describedStep 6 specifically includes following steps：Step 6.1 judges whether this data item is null record item or invalid information item according to data item mark, if so, returning empty Item or void item mark, if not, performing step 6.2；Step 6.2 verifies data item, and current data item content is returned when verifying successfully and reads Success Flag, verification is lost Back-checking failure flags when losing.
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Cited By (2)
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| CN114356792A (en) * | 2021-11-18 | 2022-04-15 | 国电南瑞三能电力仪表(南京)有限公司 | Electric energy meter frozen data storage method based on FLASH pre-erasing technology and electric energy meter |
| CN114489478A (en) * | 2021-12-20 | 2022-05-13 | 山西转型综改示范区华纳方盛科技有限公司 | Data storage method of data recorder, data storage module and data recorder |
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| CN114489478A (en) * | 2021-12-20 | 2022-05-13 | 山西转型综改示范区华纳方盛科技有限公司 | Data storage method of data recorder, data storage module and data recorder |
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| CN108228095B (en) | 2021-02-09 |
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