FLASH storage file management method

Abstract

The FLASH memory is divided into the file data storage area and the file index area. The file data storage area composed of the 'block' of FLASH memory is utilized to store the content of the file. The file index area is utilized to record the file directories and the allocation information of 'block' of FLASH memory. Based on the said partition, the operations of writing file, reading file and erasing file are carried out, making the FLASH space be allocated based on the dynamic quantity and the length of the file utilized. Thus, it is not needed to modify the code or upgrade the software when the quantity of the file is adjusted or the length of the file is changed. The invention uses the resources reasonably and saves the storage space.

Description

technical field [0001] The invention relates to a memory management method, in particular to a FLASH (flash electrically erasable programmable read-only memory) storage file management method. Background technique [0002] The storage capacity of a FLASH chip is fixed. In order to store different data files, the existing technology generally adopts the following management method. First, the FLASH is fixedly divided into several storage areas according to the FLASH capacity, the number of files and the size. For example, to store For five files of different sizes, first divide the FLASH into five areas of different sizes, and then record the corresponding starting address of each file. The data such as the size of each area above and the starting address are written in the program code in the form of constants. When it is necessary to perform operations such as reading, writing, and erasing on a file, first find out its corresponding starting address and area size. Then go ...

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Problems solved by technology

[0003] And this method has following deficiencies: (1) the programmer must know the number of files to be stored in advance before writing the FLASH management software code, to decide to divide the FLASH into several areas, which is not conducive to the indefinite number of files stored in the application of the product. If the number of files to be stored is more than the number of partitions, the code must be re-modified and the software upgraded

(2) Programmers must estimate the size of each file to be stored before writing the FLASH management software code to determine how much FLASH area to allocate for the file. If the size of the file to be stored is larger than the reserved area, the Files will not be stored correctly and also interfere with file storage in adjacent areas

(3) Because the pre-estimated file size is inaccurate, or when the file is modified, it is very likely to allocate a larger storage area to an originally small file, resulting in a waste of storage space

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