A kind of embedded flash data storage method and system

Abstract

The present invention provides an embedded FLASH data storage method and system. The embedded FLASH data storage method includes an index area and a data area, wherein, the index area adopts a fixed length for storage and management from front to back, and the data area Store and manage with variable length from back to front, until the index area and the data area conflict, then realize recovery and arrangement through FLASH erasing; the index area is used to store the record index, and the data area is used to store FLASH data. The present invention adopts a storage method extending from both ends to the middle, which can maximize the use of FLASH space and reduce the number of erasures as much as possible; change the operation of modifying records into new records, avoid block erasure actions, and greatly speed up configuration The modification time reduces the probability of failure; through the recording method of sequential growth, hardware fatigue and FLASH damage caused by repeated erasing and writing at a single point are avoided, and the stability is high.

Description

technical field [0001] The invention relates to a data storage method, in particular to an embedded FLASH data storage method, and to an embedded FLASH data storage system adopting the embedded FLASH data storage method. Background technique [0002] At present, the storage hardware of embedded storage devices is basically FLASH, and the FAT file system inherited from the PC is basically used in the storage structure, and the FAT file system is not suitable for FLASH. The main reasons are as follows: First, the structure of FAT is relatively Fixed, the location of the directory table and files is relatively fixed. When the configuration file changes repeatedly, the area where the configuration file is located will be repeatedly erased, but the total number of erases of FLASH is limited, some even only a thousand times, which is prone to damage block, resulting in damage to the FLASH hardware; second, FAT stores the configuration in a file structure, modifying a single config...

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Problems solved by technology

[0002] At present, the storage hardware of embedded storage devices is basically FLASH, and the FAT file system inherited from the PC is basically used in the storage structure, and the FAT file system is not suitable for FLASH. The main reasons are as follows: First, the structure of FAT is relatively Fixed, the location of the directory table and files is relatively fixed. When the configuration file changes repeatedly, the area where the configuration file is located will be repeatedly erased, but the total number of erases of FLASH is limited, some even only a thousand times, which is prone to damage block, resulting in damage to the FLASH hardware; second, FAT stores the configuration in a file structure, modifying a single configuration must modify the entire file, and FLASH is limited by the hardware principle, it is easy for each storage unit to change from 1 to 0, and from 0 to 1 Difficult, each modification operation of the FAT file system needs to erase the block where the entire file is located, the affected area is large, and the erasing time is long, and if the power supply is unstable during the erasing process, the entire block of data will be lost. Third, FAT is mainly for large-capacity storage, and the smallest data unit is a cluster. On an embedded small-capacity memory with only a few Mbytes, it is easy to cause space waste and low interest rate efficiency

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