/** * @brief Verify if active page is full and Writes variable in EEPROM. * @param EepromAddress: 16 bit virtual address of the variable * @param EepromData: 16 bit data to be written as variable value * @retval Success or error status: * - FLASH_COMPLETE: on success * - PAGE_FULL: if valid page is full * - NO_VALID_PAGE: if no valid page was found * - Flash error code: on write Flash error */ static uint16_t EEPROM_VerifyPageFullWriteVariable(uint16_t EepromAddress, uint16_t EepromData) { FLASH_Status FlashStatus = FLASH_COMPLETE; uint16_t ValidPage = PAGE0; uint32_t Address = PAGE0_BASE_ADDRESS, PageEndAddress = PAGE1_END_ADDRESS; /* Get valid Page for write operation */ ValidPage = EEPROM_FindValidPage(WRITE_IN_VALID_PAGE); /* Check if there is no valid page */ if (ValidPage == NO_VALID_PAGE) { return NO_VALID_PAGE; } /* Get the valid Page start Address */ Address = (uint32_t)(EEPROM_START_ADDRESS + (uint32_t)(ValidPage * PAGE_SIZE)); /* Get the valid Page end Address */ PageEndAddress = (uint32_t)((EEPROM_START_ADDRESS - 2) + (uint32_t)((1 + ValidPage) * PAGE_SIZE)); /* Check each active page address starting from begining */ while (Address < PageEndAddress) { /* Verify if Address and Address+2 contents are 0xFFFFFFFF */ if ((*(__IO uint32_t*)Address) == 0xFFFFFFFF) { /* Set variable data */ FlashStatus = FLASH_ProgramHalfWord(Address, EepromData); /* If program operation was failed, a Flash error code is returned */ if (FlashStatus != FLASH_COMPLETE) { return FlashStatus; } /* Set variable virtual address */ FlashStatus = FLASH_ProgramHalfWord(Address + 2, EepromAddress); /* Return program operation status */ return FlashStatus; } else { /* Next address location */ Address = Address + 4; } } /* Return PAGE_FULL in case the valid page is full */ return PAGE_FULL; }
/** * @brief Returns the last stored variable data, if found, which correspond to * the passed virtual address * @param EepromAddress: Variable virtual address * @param EepromData: Global variable contains the read variable value * @retval Success or error status: * - 0: if variable was found * - 1: if the variable was not found * - NO_VALID_PAGE: if no valid page was found. */ static uint16_t EEPROM_ReadVariable(uint16_t EepromAddress, uint16_t *EepromData) { uint16_t ValidPage = PAGE0; uint16_t AddressValue = 0, ReadStatus = 1; uint32_t Address = PAGE0_BASE_ADDRESS, PageStartAddress = PAGE0_BASE_ADDRESS; /* Get active Page for read operation */ ValidPage = EEPROM_FindValidPage(READ_FROM_VALID_PAGE); /* Check if there is no valid page */ if (ValidPage == NO_VALID_PAGE) { return NO_VALID_PAGE; } /* Get the valid Page start Address */ PageStartAddress = (uint32_t)(EEPROM_START_ADDRESS + (uint32_t)(ValidPage * PAGE_SIZE)); /* Get the valid Page end Address */ Address = (uint32_t)((EEPROM_START_ADDRESS - 2) + (uint32_t)((1 + ValidPage) * PAGE_SIZE)); /* Check each active page address starting from end */ while (Address > (PageStartAddress + 2)) { /* Get the current location content to be compared with virtual address */ AddressValue = (*(__IO uint16_t*)Address); /* Compare the read address with the virtual address */ if (AddressValue == EepromAddress) { /* Get content of Address-2 which is variable value */ *EepromData = (*(__IO uint16_t*)(Address - 2)); /* In case variable value is read, reset ReadStatus flag */ ReadStatus = 0; break; } else { /* Next address location */ Address = Address - 4; } } /* Return ReadStatus value: (0: variable exist, 1: variable doesn't exist) */ return ReadStatus; }
/********************************************************************************* *Function : static uint16_t EEPROM_PageTransfer(uint16_t EepromAddress, uint16_t EepromData) *Description : Transfers last updated variables data from the full Page to an empty one. *Input : EepromAddress: 16 bit virtual address of the variable EepromData: 16 bit data to be written as variable value *Output : none *Return : Success or error status: * - FLASH_COMPLETE: on success * - PAGE_FULL: if valid page is full * - NO_VALID_PAGE: if no valid page was found * - Flash error code: on write Flash error *author : lz *date : 2015-2-1 *Others : none **********************************************************************************/ static uint16_t EEPROM_PageTransfer(uint16_t EepromAddress, uint16_t EepromData) { FLASH_Status FlashStatus = FLASH_COMPLETE; uint32_t OldPageAddress = PAGE0_BASE_ADDRESS, NewPageAddress = PAGE1_BASE_ADDRESS; uint16_t ValidPage = PAGE0, EepromAddressIdx = 0; uint16_t EepromStatus = 0, ReadStatus = 0; /* Get active Page for read operation */ ValidPage = EEPROM_FindValidPage(READ_FROM_VALID_PAGE); if (ValidPage == PAGE1) /* Page1 valid */ { /* New page address where variable will be moved to */ NewPageAddress = PAGE0_BASE_ADDRESS; /* Old page address where variable will be taken from */ OldPageAddress = PAGE1_BASE_ADDRESS; } else if (ValidPage == PAGE0) /* Page0 valid */ { /* New page address where variable will be moved to */ NewPageAddress = PAGE1_BASE_ADDRESS; /* Old page address where variable will be taken from */ OldPageAddress = PAGE0_BASE_ADDRESS; } else { return NO_VALID_PAGE; /* No valid Page */ } /* Set the new Page status to RECEIVE_DATA status */ FlashStatus = FLASH_ProgramHalfWord(NewPageAddress, RECEIVE_DATA); /* If program operation was failed, a Flash error code is returned */ if (FlashStatus != FLASH_COMPLETE) { return FlashStatus; } /* Write the variable passed as parameter in the new active page */ EepromStatus = EEPROM_VerifyPageFullWriteVariable(EepromAddress, EepromData); /* If program operation was failed, a Flash error code is returned */ if (EepromStatus != FLASH_COMPLETE) { return EepromStatus; } /* Transfer process: transfer variables from old to the new active page */ for (EepromAddressIdx = 0; EepromAddressIdx < EEPROM_SIZE; EepromAddressIdx++) { if (EepromAddressTab[EepromAddressIdx] != EepromAddress) /* Check each variable except the one passed as parameter */ { /* Read the other last variable 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 new active page */ EepromStatus = EEPROM_VerifyPageFullWriteVariable(EepromAddressTab[EepromAddressIdx], EepromDataVar); /* If program operation was failed, a Flash error code is returned */ if (EepromStatus != FLASH_COMPLETE) { return EepromStatus; } } } } /* Erase the old Page: Set old Page status to ERASED status */ FlashStatus = FLASH_ErasePage(OldPageAddress); /* If erase operation was failed, a Flash error code is returned */ if (FlashStatus != FLASH_COMPLETE) { return FlashStatus; } /* Set new Page status to VALID_PAGE status */ FlashStatus = FLASH_ProgramHalfWord(NewPageAddress, VALID_PAGE); /* If program operation was failed, a Flash error code is returned */ if (FlashStatus != FLASH_COMPLETE) { return FlashStatus; } /* Return last operation flash status */ return FlashStatus; }