Writing same variable for 16K times using FDS

Question

Hello, 
 
 I have a uint16_t variable. It can increment till 16K. After every increment I want to store into Flash, so that even if there is a reset, I can restore the value. 
 1) With Flash Data Storage (FDS) whether can I achieve this. 
 2) Since Flash endurance cycle is 10K even FDS will helps. 
 3) My application will store 100k of other data into Internal flash. So will I come to know which pages are allocated as part of FDS so that it will not overlap with other data. 
 
 Thanks & Regards 
 Vishnu Beema

Einar Thorsrud · Accepted Answer

Hi, 
 beemavishnu said: 
 For better understanding, if I want to use FDS as is, then to write same variable of 4-byte size 16k (16000) times, whether do I need to change FDS_VIRTUAL_PAGES macro from 3 to 63 pages. 
 
 4 (data) + 12 (fds header) * 16000 (n. of records) = 256,000 bytes = (256,000 / 4096) = 62.5 pages. 
 
 Yes, that is correct. 
 beemavishnu said: To my understanding, even though FDS_VIRTUAL_PAGES is 3, only 2 pages are used for FDS data operations. Once all 2 pages are full, I assumed, they will be erased and start writing with latest data. But I am not seeing any page erase happening. 
 There will not be an automatic page erase. But when there is no more space left and you attempt to writ to FDS, you will get an error (FDS_ERR_NO_SPACE_IN_FLASH). Then you have to delete some records and perform garbage collection in order to free the flash space. 
 beemavishnu said: If 63 pages are to be allocated then better to go with my algorithm. No meaning in allocating 63 pages. 
 I agree that there is no meaning in this. FDS is simply not a good alternative in this case.

Writing same variable for 16K times using FDS

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