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Description in AN4061 from STM.
Changed (compared with the original code AN4061):
- possibility of a larger size of emulated EEPROM (using multiple Flash pages)
- dummy variables prevent overwrite code in Flash by algorithm of EEPROM emulation
Macro PAGE_NB_PVP (in eeprom.h) defines the size of the virtual page.
Eg. For F030 where Flash page are 1kB value 4 gives 4kB.
Size 4kB virtual page gives you the ability to use max. approx. 1k of 16-bit variables.