FLASH data reading/writing method and system

Abstract

The invention discloses a FLASH data reading / writing method and system. The method comprises a step of distributing N pages as data storage areas in a FLASH, wherein the data storage areas are used for storing data records, one page is taken as an index area and the other N-1 areas are taken as record areas. The method furthermore comprises the following steps of: S101, judging whether a target page Nm is fully written or not, if the judging result is negative, executing the step S103, and otherwise, turning to the steps S1a to S1c; S102, writing to-be-written data into the target pages Nm of the record areas in sequence; S1a, erasing information of pages Nm+2 of the record areas, namely, setting all the contents of the pages as identification information of 0xff; S1b, writing page numbers of the pages Nm+1 of the to-be-written data in the data record areas into the index area in sequence; and S1c, writing the to-be-written data into the pages Nm+1 of the record areas in sequence, wherein the pages N-1 of the record areas form a storage area of a round-robin queue. According to the method and system disclosed by the invention, the erasing frequency of the FLASH is reduced, the service life is prolonged, and the position of the final storage record during the last power down can be rapidly searched after power up.

Description

technical field [0001] The invention relates to the field of data storage, in particular to a method and system for reading and writing FLASH data. Background technique [0002] For related equipment in the field of embedded systems, users require real-time storage of equipment operation data, continuous recording time of not less than 5 minutes, data per minute of not less than 60 records, and sufficient storage space, data will not be lost when power off, memory The service life is not less than 20 years. The length of each record is 20bytes (8bit / byte). The first 14bytes store the status and various information of the device, and the last 6bytes store the real-time year, month, day, hour, minute, and second. [0003] At present, the methods for saving data include: hard disk, electronic disk, RAM plus battery, FLASH flash memory, etc. Among them, hard disks and electronic disks are high in cost and large in size; the method of adding batteries to RAM uses batteries, and...

AI Technical Summary

Problems solved by technology

Due to the limited number of erasing and writing of FLASH, frequent erasing and writing of FLASH memory will affect its service life. If no special treatment is taken, the life cannot meet the requirements

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