using flash memory

Question

Hi everyone ! I am working at a project. I dont't know which mcu was used this project but it was written for pca10040 and used s132. Many values are write to flash memory at the project. In some places it was deleted as a flash page. for example: sd_flash_page_erase(0x66) or sd_flash_page_erase(0x67) etc.. And I also want to write to flash memory more value but I don't know that which flash address are usable. 
 How much flash memory can I use to store my information? 
 Which address ranges can I use? 
 Also what does a flash page mean? 
 How many addresses are on a page? 
 Which document should I follow?

tesc · Accepted Answer

Hi, 
 Erasing can only be done by using the erase functionality, and it erases one full flash page at the time. 
 Writing can be done four bytes at a time, but what happens then is that only the 0 bits are written. When a bit has been written to 0, it cannot be written back to 1 again. In order to get it back to 1, the only way is to do a flash page erase. 
 Regards, Terje

awneil · Answer

cemalb note that these are general characteristics of all flash - not something specific or special to Nordic or nRF52. 
 The key difference between "Flash" used for program storage, and "EEPROM" designed for non-volatile data storage is this. 
 Also beware that erasing Flash causes "wear" - so you want to avoid it as much as possible. 
 tesc has already mentioned the : Flash Data Storage (FDS) module in the SDK - which takes care of all these details (and more) for you.

awneil · Answer

PCA10040 is the nRF52832 Dev Kit 
 cemalb said: How much flash memory can I use to store my information? 
 Which address ranges can I use? 
 
 Whatever's left after the flash space used by your application & the SoftDevice 
 cemalb said: Also what does a flash page mean? 
 How many addresses are on a page? 
 Which document should I follow? 
 See the Product Specification

using flash memory

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