/*********************************************************************************
*Function : uint16_t EEPROM_Init(void)
*Description : Restore the pages to a known good state in case of page's status corruption after a power loss.
*Input : none
*Output : none
*Return : none
*author : lz
*date : 2015-2-1
*Others : none
**********************************************************************************/
uint16_t EEPROM_Init(void)
{
uint16_t PageStatus0 = 6, PageStatus1 = 6;
uint16_t EepromAddressIdx = 0;
uint16_t EepromStatus = 0, ReadStatus = 0;
int16_t x = -1;
uint16_t FlashStatus;
/* Unlock the Flash Program Erase controller */
FLASH_Unlock();
/* Get Page0 status */
PageStatus0 = (*(__IO uint16_t*)PAGE0_BASE_ADDRESS);
/* Get Page1 status */
PageStatus1 = (*(__IO uint16_t*)PAGE1_BASE_ADDRESS);
/* Check for invalid header states and repair if necessary */
switch (PageStatus0)
{
case ERASED:
if (PageStatus1 == VALID_PAGE) /* Page0 erased, Page1 valid */
{
/* Erase Page0 */
FlashStatus = FLASH_ErasePage(PAGE0_BASE_ADDRESS);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else if (PageStatus1 == RECEIVE_DATA) /* Page0 erased, Page1 receive */
{
/* Erase Page0 */
FlashStatus = FLASH_ErasePage(PAGE0_BASE_ADDRESS);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Mark Page1 as valid */
FlashStatus = FLASH_ProgramHalfWord(PAGE1_BASE_ADDRESS, VALID_PAGE);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else /* First EEPROM access (Page0&1 are erased) or invalid state -> format EEPROM */
{
/* Erase both Page0 and Page1 and set Page0 as valid page */
FlashStatus = EEPROM_Format();
/* If erase/program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
break;
case RECEIVE_DATA:
if (PageStatus1 == VALID_PAGE) /* Page0 receive, Page1 valid */
{
/* Transfer data from Page1 to Page0 */
for (EepromAddressIdx = 0; EepromAddressIdx < EEPROM_SIZE; EepromAddressIdx++)
{
if (( *(__IO uint16_t*)(PAGE0_BASE_ADDRESS + 6)) == EepromAddressTab[EepromAddressIdx])
{
x = EepromAddressIdx;
}
if (EepromAddressIdx != x)
{
/* Read the last variables' updates */
ReadStatus = EEPROM_ReadVariable(EepromAddressTab[EepromAddressIdx], &EepromDataVar);
/* In case variable corresponding to the virtual address was found */
if (ReadStatus != 0x1)
{
/* Transfer the variable to the Page0 */
EepromStatus = EEPROM_VerifyPageFullWriteVariable(EepromAddressTab[EepromAddressIdx], EepromDataVar);
/* If program operation was failed, a Flash error code is returned */
if (EepromStatus != FLASH_COMPLETE)
{
return EepromStatus;
}
}
}
}
/* Mark Page0 as valid */
FlashStatus = FLASH_ProgramHalfWord(PAGE0_BASE_ADDRESS, VALID_PAGE);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Erase Page1 */
FlashStatus = FLASH_ErasePage(PAGE1_BASE_ADDRESS);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else if (PageStatus1 == ERASED) /* Page0 receive, Page1 erased */
{
/* Erase Page1 */
FlashStatus = FLASH_ErasePage(PAGE1_BASE_ADDRESS);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Mark Page0 as valid */
FlashStatus = FLASH_ProgramHalfWord(PAGE0_BASE_ADDRESS, VALID_PAGE);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else /* Invalid state -> format eeprom */
{
/* Erase both Page0 and Page1 and set Page0 as valid page */
FlashStatus = EEPROM_Format();
/* If erase/program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
break;
case VALID_PAGE:
if (PageStatus1 == VALID_PAGE) /* Invalid state -> format eeprom */
{
/* Erase both Page0 and Page1 and set Page0 as valid page */
FlashStatus = EEPROM_Format();
/* If erase/program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else if (PageStatus1 == ERASED) /* Page0 valid, Page1 erased */
{
/* Erase Page1 */
FlashStatus = FLASH_ErasePage(PAGE1_BASE_ADDRESS);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else /* Page0 valid, Page1 receive */
{
/* Transfer data from Page0 to Page1 */
for (EepromAddressIdx = 0; EepromAddressIdx < EEPROM_SIZE; EepromAddressIdx++)
{
if ((*(__IO uint16_t*)(PAGE1_BASE_ADDRESS + 6)) == EepromAddressTab[EepromAddressIdx])
{
x = EepromAddressIdx;
}
if (EepromAddressIdx != x)
{
/* Read the last variables' updates */
ReadStatus = EEPROM_ReadVariable(EepromAddressTab[EepromAddressIdx], &EepromDataVar);
/* In case variable corresponding to the virtual address was found */
if (ReadStatus != 0x1)
{
/* Transfer the variable to the Page1 */
EepromStatus = EEPROM_VerifyPageFullWriteVariable(EepromAddressTab[EepromAddressIdx], EepromDataVar);
/* If program operation was failed, a Flash error code is returned */
if (EepromStatus != FLASH_COMPLETE)
{
return EepromStatus;
}
}
}
}
/* Mark Page1 as valid */
FlashStatus = FLASH_ProgramHalfWord(PAGE1_BASE_ADDRESS, VALID_PAGE);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Erase Page0 */
FlashStatus = FLASH_ErasePage(PAGE0_BASE_ADDRESS);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
break;
default: /* Any other state -> format eeprom */
/* Erase both Page0 and Page1 and set Page0 as valid page */
FlashStatus = EEPROM_Format();
/* If erase/program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
break;
}
return FLASH_COMPLETE;
}
/**
* @brief Restore the pages to a known good state in case of page's status
* corruption after a power loss.
* @param None.
* @retval - Flash error code: on write Flash error
* - FLASH_COMPLETE: on success
*/
static uint16_t EEPROM_Init(void)
{
uint16_t PageStatus0 = 6, PageStatus1 = 6;
uint16_t virtualAddress = 0;
uint16_t EepromStatus = 0, ReadStatus = 0;
int16_t x = -1;
uint16_t FlashStatus;
uint16_t EepromDataVar = 0;
/* Calling this is here is critical on STM32F2 Devices Else Flash Operation Fails */
FLASH_ClearFlags();
/* Get Page0 status */
PageStatus0 = (*(__IO uint16_t*)PAGE0_BASE_ADDRESS);
/* Get Page1 status */
PageStatus1 = (*(__IO uint16_t*)PAGE1_BASE_ADDRESS);
/* Check for invalid header states and repair if necessary */
switch (PageStatus0)
{
case ERASED:
if (PageStatus1 == VALID_PAGE) /* Page0 erased, Page1 valid */
{
/* Normal valid state -> nothing to do */
}
else if (PageStatus1 == RECEIVE_DATA) /* Page0 erased, Page1 receive */
{
/* Erase Page0 */
FlashStatus = FLASH_EraseSector(PAGE0_ID, VOLTAGE_RANGE);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Mark Page1 as valid */
FlashStatus = FLASH_ProgramHalfWord(PAGE1_BASE_ADDRESS, VALID_PAGE);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else /* First EEPROM access (Page0&1 are erased) or invalid state -> format EEPROM */
{
/* Erase both Page0 and Page1 and set Page0 as valid page */
FlashStatus = EEPROM_Format();
/* If erase/program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
break;
case RECEIVE_DATA:
if (PageStatus1 == VALID_PAGE) /* Page0 receive, Page1 valid */
{
/* Transfer data from Page1 to Page0 */
for (virtualAddress = 0; virtualAddress < EEPROM_SIZE; virtualAddress++)
{
if (( *(__IO uint16_t*)(PAGE0_BASE_ADDRESS + 6)) == virtualAddress)
{
x = virtualAddress;
}
if (virtualAddress != x)
{
/* Read the last variables' updates */
ReadStatus = EEPROM_ReadVariable(virtualAddress, &EepromDataVar);
/* In case variable corresponding to the virtual address was found */
if (ReadStatus != 0x1)
{
/* Transfer the variable to the Page0 */
EepromStatus = EEPROM_VerifyPageFullWriteVariable(virtualAddress, EepromDataVar);
/* If program operation was failed, a Flash error code is returned */
if (EepromStatus != FLASH_COMPLETE)
{
return EepromStatus;
}
}
}
}
/* Mark Page0 as valid */
FlashStatus = FLASH_ProgramHalfWord(PAGE0_BASE_ADDRESS, VALID_PAGE);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Erase Page1 */
FlashStatus = FLASH_EraseSector(PAGE1_ID, VOLTAGE_RANGE);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else if (PageStatus1 == ERASED) /* Page0 receive, Page1 erased */
{
/* Erase Page1 */
FlashStatus = FLASH_EraseSector(PAGE1_ID, VOLTAGE_RANGE);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Mark Page0 as valid */
FlashStatus = FLASH_ProgramHalfWord(PAGE0_BASE_ADDRESS, VALID_PAGE);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else /* Invalid state -> format eeprom */
{
/* Erase both Page0 and Page1 and set Page0 as valid page */
FlashStatus = EEPROM_Format();
/* If erase/program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
break;
case VALID_PAGE:
if (PageStatus1 == VALID_PAGE) /* Harmless invalid state -> pick one page and format the other */
{
/* Erase Page0 */
FlashStatus = FLASH_EraseSector(PAGE0_ID, VOLTAGE_RANGE);
/* If erase/program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else if (PageStatus1 == ERASED) /* Page0 valid, Page1 erased */
{
/* Normal valid state -> nothing to do */
}
else /* Page0 valid, Page1 receive */
{
/* Transfer data from Page0 to Page1 */
for (virtualAddress = 0; virtualAddress < EEPROM_SIZE; virtualAddress++)
{
if ((*(__IO uint16_t*)(PAGE1_BASE_ADDRESS + 6)) == virtualAddress)
{
x = virtualAddress;
}
if (virtualAddress != x)
{
/* Read the last variables' updates */
ReadStatus = EEPROM_ReadVariable(virtualAddress, &EepromDataVar);
/* In case variable corresponding to the virtual address was found */
if (ReadStatus != 0x1)
{
/* Transfer the variable to the Page1 */
EepromStatus = EEPROM_VerifyPageFullWriteVariable(virtualAddress, EepromDataVar);
/* If program operation was failed, a Flash error code is returned */
if (EepromStatus != FLASH_COMPLETE)
{
return EepromStatus;
}
}
}
}
/* Mark Page1 as valid */
FlashStatus = FLASH_ProgramHalfWord(PAGE1_BASE_ADDRESS, VALID_PAGE);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Erase Page0 */
FlashStatus = FLASH_EraseSector(PAGE0_ID, VOLTAGE_RANGE);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
break;
default: /* Any other state -> format eeprom */
/* Erase both Page0 and Page1 and set Page0 as valid page */
FlashStatus = EEPROM_Format();
/* If erase/program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
break;
}
return FLASH_COMPLETE;
}
