Data processing method and device for SPI-Flash-based (Serial Peripheral Interface-Flash-based) file system

Abstract

The invention discloses a data processing method for an SPI-Flash-based (Serial Peripheral Interface-Flash-based) file system and a data processing device for the SPI-Flash-based file system. The data processing method is characterized in that a virtual address mapping list is added between an FatFs unit and an SPI-Flash unit, and a virtual address mapping list unit is used for balancing erasing and writing and protecting the file system from sudden power failure; the SPI-Flash unit is physically divided into three partitions of a physical storage partition, an address mapping partition and an idle reserving partition; the physical storage partition is used for corresponding to an actual physical memory of the file system; the address mapping partition is matched with the virtual address mapping list, and is used for realizing multistage power failure protection; the idle reserving partition is used for executing power failure protection and balancing erasing and writing when the file system is full. The data processing method and the data processing device disclosed by the invention have the advantage that practical and reliable power failure protection can be provided.

Description

technical field [0001] The invention relates to a data processing method and device of a Flash file system, in particular to a data processing method and device of a SPI-Flash-based file system. Background technique [0002] Chinese patent CN101526927B discloses a data processing method of a Flash file system, the Flash file system includes an address mapping block, and the address mapping block records the mapping relationship between all logical blocks and physical blocks in the Flash file, and the method includes: According to the update request of Flash file, search first free block in the physical block of Flash file system, write the Flash file that updates in described first free block; Continue to search second in the physical block of described Flash file system A free physical block, and a new address mapping block is written in the second free block. Among them, in an example of an address mapping block with a size of 512B, the byte sequence-content relationship ...

AI Technical Summary

Problems solved by technology

For existing data processing methods of this kind, see figure 1 , the FatFs unit 1 in the file system directly operates on the Flash unit 2. When the mapping relationship between the logical block and the physical block corresponding to the file changes, a new address mapping table needs to be generated to record the updated mapping relationship. Additional system overhead will be generated; in addition, the existing data processing method is aimed at smaller Flash blocks, such as: 512 bytes, for power-down protection, and cannot be well applied to flash memory with a minimum block size of 4096 bytes. SPI-Flash

Images