These worked for me:

ee.c
`
#define PAGE 0
#define SECTOR 1
#define PAGE_NUM 31

#if defined(STM32F302x8)
#define _EE_SIZE 2048
#define _EE_PAGE_OR_SECTOR PAGE
#define _EE_ADDR_INUSE
(((uint32_t)0x08000000) | (_EE_SIZE * _EE_USE_FLASH_PAGE_OR_SECTOR))
#if (_EE_USE_FLASH_PAGE_OR_SECTOR > 31)
#error "Please Enter correct address, maximum is (31)"
#endif
#endif
`

eeConfig.h
#define _EE_USE_FLASH_PAGE_OR_SECTOR (31) #define _EE_USE_RAM_BYTE (1024) #define _EE_VOLTAGE FLASH_VOLTAGE_RANGE_3 // use in some devices

Ciao