eeprom_stm32.h

#ifndef eeprom_stm32_h
#define eeprom_stm32_h

#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

#if defined(SERIES_STM32F37x)
  #define PAGE_SIZE  (uint16_t)0x800 // 2K
  #define EEPROM_START_ADDRESS    ((uint32_t)0x08010000) // total = 256K, eeprom after 64K
#elif defined(SERIES_STM32F30x)
  #define PAGE_SIZE  (uint16_t)0x800 // 2K
  #define EEPROM_START_ADDRESS    ((uint32_t)(0x08000000 + MAX_PROGRAM_SIZE)) // specified in boards.txt (end of flash - 2*page size)
#elif defined(STM32F40_41xxx) || defined(STM32F411xE)

  // EEPROM moved to first two 128k sectors (slowest place for it)
  // #define PAGE_SIZE (uint32_t) 0x20000 // 128K
  // #define EEPROM_START_ADDRESS ((uint32_t)0x08020000)
  // #define PAGE0_ID  FLASH_Sector_5
  // #define PAGE1_ID  FLASH_Sector_6

  // Original EEPROM location (good sectors, but can interfere if program is big)
  // #define PAGE_SIZE  (uint16_t)0x4000 // 16K
  // #define EEPROM_START_ADDRESS    ((uint32_t)0x08008000) // total = 1M, eeprom after 16K
  // #define PAGE0_ID               FLASH_Sector_2
  // #define PAGE1_ID               FLASH_Sector_3

  // EEPROM in 'flash hole' that the linker skips, best solution
  #define PAGE_SIZE  (uint16_t)0x4000 // 16K
  #define EEPROM_START_ADDRESS    ((uint32_t)0x08004000) // total = 1M, eeprom after 16K
  #define PAGE0_ID               FLASH_Sector_1
  #define PAGE1_ID               FLASH_Sector_2
  // Device voltage range supposed to be [2.7V to 3.6V], the operation will be done by word
  #define VOLTAGE_RANGE           (uint8_t)VoltageRange_3
#endif


// From ST =======================================================================

/* Pages 0 and 1 base and end addresses */
#define PAGE0_BASE_ADDRESS      ((uint32_t)(EEPROM_START_ADDRESS + 0x000))
#define PAGE0_END_ADDRESS       ((uint32_t)(EEPROM_START_ADDRESS + (PAGE_SIZE - 1)))

#define PAGE1_BASE_ADDRESS      ((uint32_t)(EEPROM_START_ADDRESS + PAGE_SIZE))
#define PAGE1_END_ADDRESS       ((uint32_t)(EEPROM_START_ADDRESS + (2 * PAGE_SIZE - 1)))

/* Used Flash pages for EEPROM emulation */
#define PAGE0                   ((uint16_t)0x0000)
#define PAGE1                   ((uint16_t)0x0001)

/* No valid page define */
#define NO_VALID_PAGE           ((uint16_t)0x00AB)

/* Page status definitions */
#define ERASED                  ((uint16_t)0xFFFF)     /* PAGE is empty */
#define RECEIVE_DATA            ((uint16_t)0xEEEE)     /* PAGE is marked to receive data */
#define VALID_PAGE              ((uint16_t)0x0000)     /* PAGE containing valid data */

/* Valid pages in read and write defines */
#define READ_FROM_VALID_PAGE    ((uint8_t)0x00)
#define WRITE_IN_VALID_PAGE     ((uint8_t)0x01)

/* Page full define */
#define PAGE_FULL               ((uint8_t)0x80)

uint16_t EE_Init(void);
uint16_t EE_ReadVariable(uint16_t VirtAddress, uint16_t* Data);
uint16_t EE_WriteVariable(uint16_t VirtAddress, uint16_t Data);

#ifdef __cplusplus
}
#endif

#endif