CN101989459A

CN101989459A - Method for improving service life of electrically erasable programmable read-only memory (EEPROM) by data buffering

Info

Publication number: CN101989459A
Application number: CN2010105214009A
Authority: CN
Inventors: 郭鑫俊
Original assignee: Fujian Newland Communication Science Technology Co Ltd
Current assignee: Fujian Newland Communication Science Technology Co Ltd
Priority date: 2010-10-27
Filing date: 2010-10-27
Publication date: 2011-03-23
Anticipated expiration: 2030-10-27
Also published as: CN101989459B

Abstract

The invention provides a method for improving the service life of EEEPROM by data buffering. In the method, a means of buffering data in an annular buffering area is adopted for enabling all units of the EEPROM to be used uniformly and establishing a breakpoint resetting mechanism to ensure the normal operation of the method. The method enables each unit of the EEPROM to allow for 100,000 times of erasing and writing. In addition, when the system is in a resetting environment and a power supply fails, the system can correctly find the position of the annular buffering area again, so that parameters can be stored in the EEPROM permanently and the data storage is safe and efficient.

Description

Improve the EEPROM method in serviceable life by data buffering

[technical field]

The present invention relates to a kind of field of embedded technology, during particularly at storage data on eeprom memory, owing to be subjected to the restriction of device self character, what the problem that this unit can lose efficacy after a certain unit storage data are reached certain number of times proposed is a kind of by the data buffering raising EEPROM method in serviceable life.

[background technology]

Prior art behind the initialization external memory devices, is confirmed the first address and the storage size of reference-to storage, required corresponding reference address when obtaining program work in embedded system each module of configuration-system during in initialization.EEPROM (Electrically Erasable Programmable Read Only Memo) EEPROM (ElectricallyErasable Programmable Read-Only Memory) is the read-only storage chip that data are not lost after a kind of power down.It is as one of memory device of system, and general operation is directly carried out addressing with master chip to the eeprom memory inner space.And in the supplemental characteristic that embedded software system need be preserved, it is variable often having only some data block, and other data then are changes relatively seldom; These variable data parameters generally show as some variable that defines on the software; Data structure is fixed, and under the situation of not using any software engineering, the address that writes is also fixed, and this just causes the wiping/writing repeatedly of certain fixing unit among the EEPROM easily.Each unit of EEPROM generally can only guarantee to bear 100,000 times wiping/writing, and reaches the erasable number of times limit as certain unit, and can't carry out just meaning that finish the serviceable life of this EEPROM when erasable to this unit.So data need be considered EEPROM to the embedded system of EEPROM life-span is preserved in a timing.

[summary of the invention]

In view of the deficiency of above-mentioned technology, the purpose of this invention is to provide a kind of by the data buffering raising EEPROM method in serviceable life.

For realizing above-mentioned purpose, the present invention adopts following scheme to realize: a kind of by the data buffering raising EEPROM method in serviceable life, it is characterized in that: use buffer circle to preserve data, described buffer circle comprises the annularity buffer zone that a plurality of annular data buffers and same pointers identical with the corresponding one by one size in each annular data buffer and that have are operated; Specifically realize according to the following steps:

Step 10, this buffer circle of initialization;

Step 20, the data that will preserve write annular data buffer in order, and each storage unit of described annular data buffer is all evenly recycled;

Step 30, provide a pointed to write the position of the storage unit of data at last respectively in described a plurality of annular data buffers, and store a numerical value at described state buffer, the address value that this numerical value equals the corresponding last writing position in annular data buffer adds 1;

Step 40, after system reset, the numerical value of system's reading state buffer zone, and the data that will preserve write the position of the data buffer of this numerical value correspondence of pointed.

The present invention has following advantage: can make each unit of EEPROM all afford 100,000 times and wipe/write, work as system in addition in a reset environment, situation as power-fail, system can correctly find the position of buffer circle once more, has realized guaranteeing the safe and efficient of data storage in the preservation parameter lasting in EEPROM.

[description of drawings]

Fig. 1 is the structural drawing of the buffer circle of the embodiment of the invention.

Fig. 2 is a program flow diagram of finding out the current location of data buffer after the embodiment of the invention resets.

Fig. 3 is the program flow diagram that EEPROM of the present invention reads buffer circle.

Fig. 4 is the program flow diagram that EEPROM of the present invention writes buffer circle.

[embodiment]

The present invention will be further described below in conjunction with drawings and Examples.

The invention provides a kind of by the data buffering raising EEPROM method in serviceable life, it is characterized in that: use buffer circle to preserve data, as shown in Figure 1, it is the structural representation of the buffer circle of embodiment, as known in the figure, described buffer circle comprises the annularity buffer zone that a plurality of annular data buffers and same pointers identical with the corresponding one by one size in each annular data buffer and that have are operated; Specifically realize according to the following steps:

Step 10, this buffer circle of initialization;

Step 20, the data that need are preserved write annular data buffer in order, and each storage unit of described annular data buffer is all evenly recycled;

Step 30, provide a pointed to write the position of the storage unit of data at last respectively in described a plurality of annular data buffers, and store a numerical value at described state buffer, the address value that this numerical value equals the last writing position in annular data buffer of correspondence added for 1 (the FA final address value that this numeric representation record data buffer zone can be used adds 1 and just need write the position of calculating vacant data space on the basis of data in logic);

Step 40, after system reset, the numerical value of system's reading state buffer zone, and the data that will need to preserve write the position of the data buffer of this numerical value correspondence of pointed.

The present invention can increase the number of times that data are preserved using buffer circle to preserve data in EEPROM in EEPROM.If buffer zone has two-stage, the number of times that can preserve of data is exactly the twice of single EEPROM unit so.The size of using this method to increase buffer circle just can increase the number of times that data are preserved.In other words, data are disperseed to store into the number of times that a plurality of EEPROM position can increase data storage.When using buffer circle, the buffer circle quantity that the number of times that data are preserved equals to use multiply by the number of times of single EEPROM unit.

Here being noted that to the invention provides state buffer, is the position for recovery pointer behind power supply power-fail, and this annularity buffer zone is not to be used to preserve special address, just the preservation location status of " mark " video data buffer zone.Therefore, described annular data buffer has identical size and identical pointer operation with the annularity buffer zone, find out after concrete the resetting the data buffer current location program circuit as shown in Figure 2, search the EEPROM location address at first earlier, its address addr=state buffer start address, do you and judge that the state buffer current address equals the value of state buffer next address+1? be, the unit n+1 of EEPROM location address addr=buffer zone then, and return and continue to judge, otherwise EEPROM location address addr=EEPROM current location address addr deducts the sizes values of buffer zone subtracts 1 again, returns again.

Please refer to Fig. 3 and Fig. 4, Fig. 3, Fig. 4 are the program flow diagrams of present embodiment EEPROM read/write buffer circle, when writing annular data buffer, the annularity buffer zone also will upgrade simultaneously: the same position of described pointed data buffer and state buffer, the address value that the numerical value of state buffer equals the last writing position in data buffer adds 1, when buffer zone also is like this from unrolling at last when initial.After the system reset, just can from the annularity buffer zone, search for, if the difference of the content of adjacent two unit greater than 1, just can be found out last position of revising.

Here being noted that before using for the first time needs initialization annularity buffer zone EEPROM, and therefore, above-mentioned step 10 is very important.Otherwise possibly can't correctly find the position of buffer zone final updating.This problem only can betide before buffer circle is finished the whole buffer zone of roaming and be reset.Best solution is to guarantee that buffer zone is initialised, erasing-programming together when the Flash erasing-programming.

What deserves to be mentioned is, method of the present invention can be passed through ST Embedded Toolset R2.1.2 development environment coding code, can in order to Sti5105 be the digital TV set-top box of master chip as target device, include the annularity buffer zone of a plurality of annular data buffers and and the same pointers operation that have identical among the EEPROM of the present invention with the corresponding one by one size in each annular data buffer.

The above only is the present invention's preferred embodiment, and all equalizations of being done according to the present patent application claim change and modify, and all should belong to the present invention's covering scope.

Claims

1. one kind is improved the EEPROM method in serviceable life by data buffering, it is characterized in that: use buffer circle to preserve data, described buffer circle comprises the annularity buffer zone that a plurality of annular data buffers and same pointers identical with the corresponding one by one size in each annular data buffer and that have are operated; Specifically realize according to the following steps:

Step 10, this buffer circle of initialization;

2. according to claim 1ly improve the EEPROM method in serviceable life by data buffering, it is characterized in that: this method is that the digital TV set-top box of master chip is as target device in order to Sti5105.