CN103761197A - Method and system for storing data by using Flash and RAM (random-access memory) - Google Patents
Method and system for storing data by using Flash and RAM (random-access memory) Download PDFInfo
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- CN103761197A CN103761197A CN201410019528.3A CN201410019528A CN103761197A CN 103761197 A CN103761197 A CN 103761197A CN 201410019528 A CN201410019528 A CN 201410019528A CN 103761197 A CN103761197 A CN 103761197A
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Abstract
The invention provides a method and a system for storing data by using a Flash and a Ram (random-access memory). The method comprises the following steps of copying data to be run in the Flash into the RAM and storing the data to be run in the RAM when the system is powered on; decompressing and decrypting the data to be run in the RAM; running the decompressed and decrypted data in the RAM; encrypting and compressing the data running in the RAM to obtain encrypted and compressed data when the system is powered down; and copying the encrypted and compressed data into the Flash and storing the encrypted and compressed data in the Flash. Because a compression algorithm is performed on the data, the storage quantity of the data in the Flash is greatly increased, and the downloading speed and the uploading speed of the data are also increased. Moreover, the data only run in the RAM; and when the system is powered down, the data are stored in the FLASH, so that the erasing frequency of the FLASH is reduced, and the service life of the FLASH is prolonged.
Description
Technical field
The present invention relates to technical field of data storage, in particular a kind of date storage method that comprises Flash and RAM and system.
Background technology
PLC(Programmable Logic Controller in the market, it is programmable logic controller (PLC), it is a kind of electronic system of digital operation operation, aim in industrial environment application and the controller of design) in order to reach larger memory capacity and longer power down retention time, the large capacitance stores of general employing more multipotency extends the power down retention time, and adopting read or write speed NAND FLASH, MMC(MultiMedia Card, i.e. multimedia card faster) mass storage such as storage card reaches compared with large buffer memory.Also have part PLC to adopt RAM and battery powered mode to keep data.In the prior art, when adopting mmc card, can cause along with the aging of product draw-in groove loose contact problem, thereby affect the stability of PLC.And when adopting NAND FLASH or battery powered RAM, although PLC arithmetic speed is exceedingly fast, and capacity is large, it causes production cost high.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, the object of the present invention is to provide date storage method and the system of a kind of Flash of comprising and RAM, be intended to solve short and storage data volume of PLC power down retention time in prior art large between conflicting problem.
Technical scheme of the present invention is as follows:
A date storage method that comprises Flash and RAM, is characterized in that, described method comprises step:
A, when system powers on, by treating that service data copies in RAM and store in Flash, in RAM, again it is carried out to decompress(ion) and decryption processing, in RAM, move afterwards the data after decompress(ion) and deciphering;
B, when system starts power down, postrun data in RAM are encrypted and compress processing, encrypted and compress after data, copied in Flash and stored afterwards.
The described date storage method that comprises Flash and RAM, wherein, described steps A specifically comprises:
A1, when system powers on, by being encrypted and compressing after processing until service data in Flash, obtain treating the compressed package of service data, and copied in RAM and store;
A2, to copy in RAM, store described in to be moved through encrypting and the packet of compression carries out data decompression processing, by its decompress(ion), be decompressed data;
A3, the decompressed data in RAM is decrypted to processing, is resolved to the data that can move, the wherein said data of moving are the data that can move in RAM that the enciphered data from moving obtains after decipherment algorithm deciphering;
A4, to can service data carrying out data verification processing in RAM, when by checking, in RAM, operation is described can service data, when not by checking, do not move described can service data.
The described date storage method that comprises Flash and RAM, wherein, described step B specifically comprises:
B1, when system starts power down, the data that obtain after operation in RAM are encrypted, obtain enciphered data;
B2, the described enciphered data in RAM is compressed to processing, obtain packed data;
B3, the described packed data in RAM is copied in Flash and stored.
The described date storage method that comprises Flash and RAM is wherein, to be moved through encrypting and the packet of compression comprises user's configuration, data and program described in described steps A 1; Wherein said user is configured to user's configuration, formula and initialization setting, for various functions are set; Described data are variable, for stored program operation result; Described program is instruction machine code set.
The described date storage method that comprises Flash and RAM is wherein, to be moved through encrypting and the packet of compression adopts LZW decompression algorithm to carry out decompression processing to it described in described steps A 2.
The described date storage method that comprises Flash and RAM, wherein, the described data that obtain after operation in RAM in described step B1 comprise program operation result and user's configuration.
The described date storage method that comprises Flash and RAM, wherein, the described enciphered data in described step B2 adopts LZW compression algorithm to compress processing to it.
A data-storage system that comprises Flash and RAM, wherein, comprises power on processing module and power down process module, wherein:
The described processing module that powers on for when system powers on, by treating that service data copies in RAM and store in Flash, is carried out decompress(ion) and decryption processing to it again in RAM, moves afterwards the data after decompress(ion) and deciphering in RAM;
Described power down process module, for when system starts power down, is encrypted postrun data in RAM and compress processing, encrypted and compress after data, copied in Flash and stored afterwards.
The described data-storage system that comprises Flash and RAM, wherein, described in the processing module that powers on comprise:
Compression and copied cells, for when system powers on, by being encrypted and compressing after processing until service data in Flash, obtain treating the compressed package of service data, and copied in RAM and store;
Decompression unit, for to be moved through encrypting and the packet of compression carries out data decompression processing described in copying to that RAM stores, is decompressed data by its decompress(ion);
Decryption unit, is decrypted processing for the decompressed data to RAM, is resolved to the data that can move, and the wherein said data of moving are the data that can move in RAM that the enciphered data from moving obtains after decipherment algorithm deciphering;
Authentication unit, for to RAM can service data carry out data verification processing, when by checking, in RAM, operation is described can service data, when not by checking, do not move described can service data.
The described data-storage system that comprises Flash and RAM, wherein, described power down process module comprises:
Ciphering unit, for when system starts power down, is encrypted the data that obtain after operation in RAM, obtains enciphered data;
The second compression unit, compresses processing for the described enciphered data to RAM, obtains packed data;
The second copied cells, for copying to the described packed data of RAM in Flash and store.
A kind of date storage method that comprises Flash and RAM provided by the present invention and system, described method comprises step: when system powers on, by treating that service data copies in RAM and store in Flash, in RAM, again it is carried out to decompress(ion) and decryption processing, in RAM, move afterwards the data after decompress(ion) and deciphering; When system starts power down, postrun data in RAM are encrypted and compress processing, encrypted and compress after data, copied in Flash and stored afterwards.Due to data have been adopted to compression algorithm, data volume memory space in Flash greatly promotes, and has also improved download, the upload speed of data simultaneously.Data are only moved and only in Flash, are stored in RAM simultaneously, thereby have reduced the erasable number of times of FLASH, have extended the serviceable life of FLASH.
Accompanying drawing explanation
Fig. 1 is a kind of date storage method preferred embodiment flow chart of steps that comprises Flash and RAM provided by the invention.
Fig. 2 is the concrete steps process flow diagram for the treatment of scheme of powering in Fig. 1.
Fig. 3 is the concrete steps process flow diagram of power down process flow process in Fig. 1.
Fig. 4 is the structured flowchart of a kind of data-storage system preferred embodiment that comprises Flash and RAM provided by the invention.
Fig. 5 is the structured flowchart of processing module of powering in Fig. 4.
Fig. 6 is the structured flowchart of power down process module in Fig. 4.
Embodiment
The invention provides date storage method and the system of a kind of Flash of comprising and RAM, for making object of the present invention, technical scheme and effect clearer, clear and definite, referring to accompanying drawing, developing simultaneously, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Below in conjunction with Fig. 1, the date storage method of the Flash of comprising of the present invention and RAM is elaborated, wherein, Fig. 1 is the date storage method preferred embodiment flow chart of steps of a kind of Flash of comprising provided by the invention and RAM.
Step S101, when system powers on, by treating that service data copies in RAM and store in Flash, in RAM, again it is carried out to decompress(ion) and decryption processing, in RAM, move afterwards the data after decompress(ion) and deciphering;
Step S102, when system starts power down, postrun data in RAM are encrypted and compress processing, encrypted and compress after data, copied in Flash and stored afterwards.
In step S101, when system starts to power on, as shown in Figure 2, its step specifically comprises:
Step S201, when system powers on, by being encrypted and compressing after processing until service data in Flash, obtain treating the compressed package of service data, and copied in RAM and store;
Step S202, to copy in RAM, store described in to be moved through encrypting and the packet of compression carries out data decompression processing, by its decompress(ion), be decompressed data;
Step S203, the decompressed data in RAM is decrypted to processing, is resolved to the data that can move, the wherein said data of moving are the data that can move in RAM that the enciphered data from moving obtains after decipherment algorithm deciphering;
Step S204, to can service data carrying out data verification processing in RAM, when by checking, in RAM, operation is described can service data, when not by checking, do not move described can service data.
Further, in step S201 and step S202, data are compressed with decompression processing and adopted respectively LZW compression and decompression algorithm.
LZW compression algorithm is the common inventions of 3 people of Lempel-Ziv-Welch, is called for short the compression algorithm of LZW, can realize it with any language.LZW is the compression algorithm of GIF picture file, and the thought of zip compression is also based on LZW realization, so LZW has good compression performance to text.
Wherein, the ultimate principle of LZW compression algorithm: extract the kinds of characters in urtext file data, based on these characters, create a compile list, then with the index of the character in compile list, substitute the respective symbols in urtext file data, reduce raw data size.Its principle and palette image to realize principle similar, but compile list herein is not pre-created, but according to original file data dynamic creation, also will be from restoring original compile list coded data during decoding.The inverse process that LZW decompression algorithm process is compression algorithm.
In step S203, the decompressed data in RAM is decrypted to processing, is resolved to the data that can move, the process of resolution data is the process of data decryption.In data decryption process, comprise the following steps: the one, obtain key; The 2nd, by key, will add ciphertext and revert to expressly.Key is used during to data encryption in step S201, can be used as decruption key herein simultaneously.After data are encrypted, can improve the security of data in transmitting procedure.
In step S204 when can service data carrying out data check, the proof test value calculating by a kind of algorithm data of appointment.Data are replicated before transmission, adopt same algorithm to calculate a proof test value, if the proof test value of twice calculating is the same, illustrate that data are complete.Data are verified and can be guaranteed that data occur without Loss during being transferred to RAM process from Flash, can guarantee that data can normally operation in RAM.In step S204, adopt wherein any in the simplest verification, parity checking, CRC cyclic redundancy check (CRC) and MD5 and digital signature verification.
In step S102, when system starts power down, as shown in Figure 3, its step specifically comprises:
Step S301, when system starts power down, the data that obtain after operation in RAM are encrypted, obtain enciphered data;
Step S302, the described enciphered data in RAM is compressed to processing, obtain packed data;
Step S303, the described packed data in RAM is copied in Flash and stored.
In step S302, adopt equally LZW compression algorithm to compress processing to data, to reduce the storage occupancy of data.
When system powers on again, the spatial mappings of Flash is carried out in RAM, adopt spatial mappings method that data are mapped to RAM relaying reforwarding row again, now without the working procedure that again starts anew, obtain power-off before RAM move the data that obtained, improved operation efficiency.
Further, in described step S201 described in treat that service data comprises user's configuration, data and program; Wherein said user is configured to user's configuration, formula and initialization setting, for various functions are set; Described data are variable, for stored program operation result; Described program is instruction machine code set.The data that obtain after described decompressed data operation in described step S301 comprise program operation result and user's configuration.When system powers on, Flash in PLC moves user's configuration, data and program copy in RAM, when program runs to certain one-phase, system starts power down, now utilize capacitances to supply power can guarantee not power-off immediately of system, therefore before the complete power-off of system, program operation result and user configuration all can be compressed and transfer to Flash in preserve, with when system powers on next time, adopt spatial mappings method that program operation result and user's configuration are mapped to RAM relaying reforwarding row from Flash.Wherein, Flash powers on and only preserves various data and do not move during power down in system, and RAM returns Flash by data when a service data, power down and preserves when system powers on, thereby has reduced the erasable number of times of FLASH, has extended the serviceable life of FLASH.Due to adopted compression algorithm before data transmission, data volume memory space in Flash greatly promotes, and has also improved download, the upload speed of data simultaneously.
Based on above-described embodiment, the present invention also provides the data-storage system of a kind of Flash of comprising and RAM, as shown in Figure 4, is the structured flowchart of the data-storage system preferred embodiment that comprises Flash and RAM provided by the invention.
As shown in Figure 4, described in comprise Flash and RAM data-storage system comprise power on processing module 100 and power down process module 200, wherein:
The processing module 100 that powers on for when system powers on, by treating that service data copies in RAM and store in Flash, is carried out decompress(ion) and decryption processing to it again in RAM, moves afterwards the data after decompress(ion) and deciphering in RAM;
Power down process module 200, for when system starts power down, is encrypted postrun data in RAM and compress processing, encrypted and compress after data, copied in Flash and stored afterwards.
Embodiment further, as described in Figure 5, described in the processing module 100 that powers on comprise:
Compression and copied cells 110, for when system powers on, by treating that service data compressed package copies in RAM and store in Flash;
Embodiment further, as described in Figure 6, described power down process module 200 comprises:
The second compression unit 220, compresses processing for the described enciphered data to RAM, obtains packed data;
The second copied cells 230, for copying to the described packed data of RAM in Flash and store.
In sum, a kind of date storage method that comprises Flash and RAM provided by the present invention and system, described method comprises step: when system powers on, by treating that service data copies in RAM and store in Flash, in RAM, again it is carried out to decompress(ion) and decryption processing, in RAM, move afterwards the data after decompress(ion) and deciphering; When system starts power down, postrun data in RAM are encrypted and compress processing, encrypted and compress after data, copied in Flash and stored afterwards.Due to data have been adopted to compression algorithm, data volume memory space in Flash greatly promotes, and has also improved download, the upload speed of data simultaneously.Data are only moved and only in Flash, are stored in RAM simultaneously, thereby have reduced the erasable number of times of FLASH, have extended the serviceable life of FLASH.
Should be understood that, application of the present invention is not limited to above-mentioned giving an example, and for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (10)
1. a date storage method that comprises Flash and RAM, is characterized in that, described method comprises step:
A, when system powers on, by treating that service data copies in RAM and store in Flash, in RAM, again it is carried out to decompress(ion) and decryption processing, in RAM, move afterwards the data after decompress(ion) and deciphering;
B, when system starts power down, postrun data in RAM are encrypted and compress processing, encrypted and compress after data, copied in Flash and stored afterwards.
2. the date storage method that comprises according to claim 1 Flash and RAM, is characterized in that, described steps A specifically comprises:
A1, when system powers on, to be moved through encrypting and the packet of compression copies in RAM and stores by Flash;
A2, to copy in RAM, store described in to be moved through encrypting and the packet of compression carries out data decompression processing, by its decompress(ion), be decompressed data;
A3, the decompressed data in RAM is decrypted to processing, is resolved to the data that can move, the wherein said data of moving are the data that can move in RAM that the enciphered data from moving obtains after decipherment algorithm deciphering;
A4, to can service data carrying out data verification processing in RAM, when by checking, in RAM, operation is described can service data, when not by checking, do not move described can service data.
3. the date storage method that comprises according to claim 1 Flash and RAM, is characterized in that, described step B specifically comprises:
B1, when system starts power down, the data that obtain after operation in RAM are encrypted, obtain enciphered data;
B2, the described enciphered data in RAM is compressed to processing, obtain packed data;
B3, the described packed data in RAM is copied in Flash and stored.
4. the date storage method that comprises according to claim 2 Flash and RAM, is characterized in that, to be moved through encrypting and the packet of compression comprises user's configuration, data and program described in described steps A 1; Wherein said user is configured to user's configuration, formula and initialization setting, for various functions are set; Described data are variable, for stored program operation result; Described program is instruction machine code set.
5. the date storage method that comprises according to claim 2 Flash and RAM, is characterized in that, to be moved through encrypting and the packet of compression adopts LZW decompression algorithm to carry out decompression processing to it described in described steps A 2.
6. the date storage method that comprises according to claim 3 Flash and RAM, is characterized in that, the described data that obtain after operation in RAM in described step B1 comprise program operation result and user's configuration.
7. the date storage method that comprises according to claim 3 Flash and RAM, is characterized in that, the described enciphered data in described step B2 adopts LZW compression algorithm to compress processing to it.
8. a data-storage system that comprises Flash and RAM, is characterized in that, comprises power on processing module and power down process module, wherein:
The described processing module that powers on for when system powers on, by treating that service data copies in RAM and store in Flash, is carried out decompress(ion) and decryption processing to it again in RAM, moves afterwards the data after decompress(ion) and deciphering in RAM;
Described power down process module, for when system starts power down, is encrypted the data that obtain after operation in RAM and compress processing, encrypted and compress after data, copied in Flash and stored afterwards.
9. the data-storage system that comprises according to claim 8 Flash and RAM, is characterized in that, described in the processing module that powers on comprise:
Compression and copied cells, for when system powers on, by being encrypted and compressing after processing until service data in Flash, obtain treating the compressed package of service data, and copied in RAM and store;
Decompression unit, for to be moved through encrypting and the packet of compression carries out data decompression processing described in copying to that RAM stores, is decompressed data by its decompress(ion);
Decryption unit, is decrypted processing for the decompressed data to RAM, is resolved to the data that can move, and the wherein said data of moving are the data that can move in RAM that the enciphered data from moving obtains after decipherment algorithm deciphering;
Authentication unit, for to RAM can service data carry out data verification processing, when by checking, in RAM, operation is described can service data, when not by checking, do not move described can service data.
10. the data-storage system that comprises according to claim 8 Flash and RAM, is characterized in that, described power down process module comprises:
Ciphering unit, for when system starts power down, is encrypted the data that obtain after operation in RAM, obtains enciphered data;
The second compression unit, compresses processing for the described enciphered data to RAM, obtains packed data;
The second replication module, for copying to the described packed data of RAM in Flash and store.
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| CN110635849A (en) * | 2019-10-23 | 2019-12-31 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN111798366A (en) * | 2020-06-18 | 2020-10-20 | 福州富昌维控电子科技有限公司 | Method and terminal for accelerating PNG display speed based on small memory embedded device |
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