An on-orbit write-in and self-inspection method based on a page mode for a spacecraft EEPROM

Abstract

The invention discloses an on-orbit write-in and self-checking method based on a page mode for a spacecraft EEPROM, and belongs to the technical field of spacecraft software safety. According to the method disclosed by the invention, the integrity and correctness of the received data to be written into the EEPROM program are checked, and the correctness of the EEPROM data after on-orbit writing ischecked, so that the data finally written into the EEPROM is completely consistent with the data expected to be written into the EEPROM; Meanwhile, the EEPROM is automatically detected periodically,correct data are written back in time in the area where single-bit errors or double-bit errors occur, the single-bit errors or double-bit errors in the EEPROM can be found out in time, and correct data stored in the SRAM temporary cache area are used for write-back correction in time.

Description

technical field [0001] The invention relates to an on-orbit writing and self-checking method based on a page mode of a spacecraft EEPROM, belonging to the technical field of spacecraft software safety. Background technique [0002] The spacecraft computer system is generally composed of CPU, program memory, memory, IO equipment, etc., among which the program memory is divided into PROM, EEPROM, FLASH and so on. Electrically Erasable Programmable Memory (EEPROM) is a widely used program storage chip. Because it can rewrite the content at any time like RAM, and can store information for a long time like other ROMs, it is widely used in spacecraft computer systems. has been more and more widely used. There are two ways of writing EEPROM: byte-by-byte and page-by-page. Among them, EEPROM is written by page with a higher write endurance. [0003] Compared with the embedded computer system on the ground, the spacecraft computer system has two different characteristics when upgra...

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Problems solved by technology

[0007] (1) The program data to be written into the EEPROM is realized by receiving and writing in batches, and the integrity and correctness of the program data to be written into the EEPROM cannot be guaranteed. Some data is lost or an error occurs during the transmission process. In the case of , writing the received program data directly to the EEPROM may cause the software to fail to start normally;

[0008] (2) During the process of writing program data to EEPROM, it may be affected by unexpected conditions such as external interruption and hardware circuit interference, which may cause some program data to fail to be written to EEPROM, and the above method does not provide detection of data writing failure. means;

[0009] (3) Affected by space single event effects, the program data stored in the spacecraft EEPROM may have single-bit or double-bit errors in orbit

In the above method, during the running of the software, no self-test operation is performed on the EEPROM. If the data in the EEPROM is overturned by a single event on the track, the software cannot find and correct the EEPROM storage area where the error occurs in time.

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