Parameter management method and system based on embedded type equipment flash memory

Abstract

The invention discloses a parameter management method based on an embedded type equipment flash memory. The method comprises the following steps: according to a fixed format, parameters are encapsulated to obtain parameter data blocks; the parameter data blocks are sequentially stored in a parameter storage region; according to a parameter ID of a new parameter which is prepared to read, whether a parameter containing the same parameter ID exists in the parameter storage region is retrieved; if existing, the current parameter is marked as trash data; whether the residual space in the parameter storage region can contain the new parameter is judged; if not existing, whether the residual space in the parameter storage region can contain the new parameter is directly judged; and when the residual space in the parameter storage region can contain the new parameter, the new parameter is read in the finishing position of the last parameter in the parameter storage region. The invention also discloses a parameter management system based on the embedded type equipment flash memory; and the method and the system can improve the utilization rate of the space of the flash memory, prolong the service life of the flash memory and improve the safety in reading or modifying the parameters.

Description

technical field [0001] The invention relates to a parameter recording technology of an embedded device, in particular to a parameter management method and system based on a flash memory of an embedded device. Background technique [0002] Embedded electronic devices generally do not have storage devices such as hard disks, but use storage devices specially designed for embedded systems such as Flash flash memory chips and compact flash memory cards. Flash memory is the mainstream memory widely used in embedded systems at present. Its main features are erasing as a whole or block unit and programming by byte. It has the advantages of low power consumption, high density, and small size. [0003] At present, Flash memory is divided into two types: NOR (NOR) and NAND. NOR-type Flash flash memory can directly read the data stored in the flash memory chip, so it runs faster; the address line and data line of the NOR-type Flash flash memory chip are separated, so it can be used as...

AI Technical Summary

Problems solved by technology

A common Flash file system such as jffs2 requires a Flash partition to contain at least five Flash blocks to ensure the normal operation of the flash memory. The Flash partition has such a large space to store parameters, so, for low-cost embedded electronic devices, it is not conducive to controlling the price of the product

[0005]Another compromise is: instead of using the common Flash file system management parameters, all parameters in the Flash memory will be backed up every time the parameters are changed to the RAM, then erase the corresponding Flash block, and finally write the updated parameters and unchanged parameters in the RAM into the Flash block, but the problem with this approach is that even if only one parameter is changed, it must be Erase the entire Flash block area and then rewrite it. If the device is powered off during the erasing or writing process, the parameters will be lost because there is no data protection function of the general Flash file system; The lifetime of a Flash block is about 100,000 erases and writes, so this method will shorten the service life of the product

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