Backup and query method of FLASH-based small data

Abstract

The invention relates to a backup and query method of FLASH-based small data. The method aims at the small data with fixed string length and backup cycle, time and date of backup data and a mapping relation of the storage area position of a FLASH chip are established, multiple circulation is not needed to use for searching the storage position and a query point in the whole chip range, and a time label is only needed to write in when each data storage page starts to write. A sector is used as an operating unit during the data storage, and the sequence is identified through a sector number and the time label of a page. When a sector is filled with data, the earliest used sector is searched, cleaned up and used as a current working sector, so that even abrasion can be achieved. According to the method, data storage and query are simple and fast, and the defects of limited resources and low processing speed of a single chip microcomputer are effectively overcome.

Description

technical field [0001] The invention belongs to the technical field of data storage, and in particular relates to a FLASH-based small data backup and query method. Background technique [0002] Data backup is of great significance under the single-chip microcomputer system, and there are many ways of data backup, such as SD card storage, EEROM storage, and FLASH storage. FLASH is widely used in data backup by single-chip microcomputer systems because of its flexible and rich functions and convenient use. The Flash memory chip is connected to the microcontroller through the SPI bus. The specific connection is as follows: figure 1 As shown, the single-chip microcomputer puts the latest data collected in the designated cache according to the format and order specified by the algorithm. The new data overwrites the data of the previous cycle, and according to the timing signal, the data in the cache is written into the flash through the SPI bus. Generally, FLASH ROM is compose...

AI Technical Summary

Problems solved by technology

For management equipment, the processor needs to handle other tasks, such as data collection and processing. Therefore, the writing of data backup should be simple, and the search should be convenient. In small data backup applications, it is also required that the code space is small and the CPU is occupied. Resources are relatively small, and the existing small-scale data backup method based on FLASH needs to use multiple loops to search for storage locations and query points within the entire chip range, making data storage and query not simple and fast enough, and unable to overcome the limitations of limited MCU resources and slow processing speed. bottleneck

Images