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- /**
- ******************************************************************************
- * @file EEPROM/EEPROM_Emulation/src/eeprom.c
- * @author MCD Application Team
- * @version V1.2.6
- * @date 04-November-2016
- * @brief This file provides all the EEPROM emulation firmware functions.
- ******************************************************************************
- * @attention
- *
- * Copyright © 2016 STMicroelectronics International N.V.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted, provided that the following conditions are met:
- *
- * 1. Redistribution of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. Neither the name of STMicroelectronics nor the names of other
- * contributors to this software may be used to endorse or promote products
- * derived from this software without specific written permission.
- * 4. This software, including modifications and/or derivative works of this
- * software, must execute solely and exclusively on microcontroller or
- * microprocessor devices manufactured by or for STMicroelectronics.
- * 5. Redistribution and use of this software other than as permitted under
- * this license is void and will automatically terminate your rights under
- * this license.
- *
- * THIS SOFTWARE IS PROVIDED BY STMICROELECTRONICS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS, IMPLIED OR STATUTORY WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
- * PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY
- * RIGHTS ARE DISCLAIMED TO THE FULLEST EXTENT PERMITTED BY LAW. IN NO EVENT
- * SHALL STMICROELECTRONICS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
- * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
- * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- ******************************************************************************
- */
- /** @addtogroup EEPROM_Emulation
- * @{
- */
- #if defined(STM32GENERIC) && (defined(STM32F4) || defined(STM32F7))
-
- /* Includes ------------------------------------------------------------------*/
- #include "eeprom_emul.h"
-
- /* Private variables ---------------------------------------------------------*/
-
- /* Global variable used to store variable value in read sequence */
- uint16_t DataVar = 0;
-
- /* Virtual address defined by the user: 0xFFFF value is prohibited */
- uint16_t VirtAddVarTab[NB_OF_VAR];
-
- /* Private function prototypes -----------------------------------------------*/
- /* Private functions ---------------------------------------------------------*/
- static HAL_StatusTypeDef EE_Format();
- static uint16_t EE_FindValidPage(uint8_t Operation);
- static uint16_t EE_VerifyPageFullWriteVariable(uint16_t VirtAddress, uint16_t Data);
- static uint16_t EE_PageTransfer(uint16_t VirtAddress, uint16_t Data);
- static uint16_t EE_VerifyPageFullyErased(uint32_t Address);
-
- /**
- * @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
- */
- uint16_t EE_Initialize() {
- /* Get Page0 and Page1 status */
- uint16_t PageStatus0 = (*(__IO uint16_t*)PAGE0_BASE_ADDRESS),
- PageStatus1 = (*(__IO uint16_t*)PAGE1_BASE_ADDRESS);
-
- FLASH_EraseInitTypeDef pEraseInit;
- pEraseInit.TypeErase = TYPEERASE_SECTORS;
- pEraseInit.Sector = PAGE0_ID;
- pEraseInit.NbSectors = 1;
- pEraseInit.VoltageRange = VOLTAGE_RANGE;
-
- HAL_StatusTypeDef FlashStatus; // = HAL_OK
-
- /* Check for invalid header states and repair if necessary */
- uint32_t SectorError;
- switch (PageStatus0) {
- case ERASED:
- if (PageStatus1 == VALID_PAGE) { /* Page0 erased, Page1 valid */
- /* Erase Page0 */
- if (!EE_VerifyPageFullyErased(PAGE0_BASE_ADDRESS)) {
- /* As the last operation, simply return the result */
- return HAL_FLASHEx_Erase(&pEraseInit, &SectorError);
- }
- }
- else if (PageStatus1 == RECEIVE_DATA) { /* Page0 erased, Page1 receive */
- /* Erase Page0 */
- if (!EE_VerifyPageFullyErased(PAGE0_BASE_ADDRESS)) {
- HAL_StatusTypeDef fStat = HAL_FLASHEx_Erase(&pEraseInit, &SectorError);
- /* If erase operation was failed, a Flash error code is returned */
- if (fStat != HAL_OK) return fStat;
- }
- /* Mark Page1 as valid */
- /* As the last operation, simply return the result */
- return HAL_FLASH_Program(TYPEPROGRAM_HALFWORD, PAGE1_BASE_ADDRESS, VALID_PAGE);
- }
- else { /* First EEPROM access (Page0&1 are erased) or invalid state -> format EEPROM */
- /* Erase both Page0 and Page1 and set Page0 as valid page */
- /* As the last operation, simply return the result */
- return EE_Format();
- }
- break;
-
- case RECEIVE_DATA:
- if (PageStatus1 == VALID_PAGE) { /* Page0 receive, Page1 valid */
- /* Transfer data from Page1 to Page0 */
- int16_t x = -1;
- for (uint16_t VarIdx = 0; VarIdx < NB_OF_VAR; VarIdx++) {
- if (( *(__IO uint16_t*)(PAGE0_BASE_ADDRESS + 6)) == VirtAddVarTab[VarIdx])
- x = VarIdx;
- if (VarIdx != x) {
- /* Read the last variables' updates */
- uint16_t ReadStatus = EE_ReadVariable(VirtAddVarTab[VarIdx], &DataVar);
- /* In case variable corresponding to the virtual address was found */
- if (ReadStatus != 0x1) {
- /* Transfer the variable to the Page0 */
- uint16_t EepromStatus = EE_VerifyPageFullWriteVariable(VirtAddVarTab[VarIdx], DataVar);
- /* If program operation was failed, a Flash error code is returned */
- if (EepromStatus != HAL_OK) return EepromStatus;
- }
- }
- }
- /* Mark Page0 as valid */
- FlashStatus = HAL_FLASH_Program(TYPEPROGRAM_HALFWORD, PAGE0_BASE_ADDRESS, VALID_PAGE);
- /* If program operation was failed, a Flash error code is returned */
- if (FlashStatus != HAL_OK) return FlashStatus;
- pEraseInit.Sector = PAGE1_ID;
- pEraseInit.NbSectors = 1;
- pEraseInit.VoltageRange = VOLTAGE_RANGE;
- /* Erase Page1 */
- if (!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS)) {
- /* As the last operation, simply return the result */
- return HAL_FLASHEx_Erase(&pEraseInit, &SectorError);
- }
- }
- else if (PageStatus1 == ERASED) { /* Page0 receive, Page1 erased */
- pEraseInit.Sector = PAGE1_ID;
- pEraseInit.NbSectors = 1;
- pEraseInit.VoltageRange = VOLTAGE_RANGE;
- /* Erase Page1 */
- if (!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS)) {
- HAL_StatusTypeDef fStat = HAL_FLASHEx_Erase(&pEraseInit, &SectorError);
- /* If erase operation was failed, a Flash error code is returned */
- if (fStat != HAL_OK) return fStat;
- }
- /* Mark Page0 as valid */
- /* As the last operation, simply return the result */
- return HAL_FLASH_Program(TYPEPROGRAM_HALFWORD, PAGE0_BASE_ADDRESS, VALID_PAGE);
- }
- else { /* Invalid state -> format eeprom */
- /* Erase both Page0 and Page1 and set Page0 as valid page */
- /* As the last operation, simply return the result */
- return EE_Format();
- }
- break;
-
- case VALID_PAGE:
- if (PageStatus1 == VALID_PAGE) { /* Invalid state -> format eeprom */
- /* Erase both Page0 and Page1 and set Page0 as valid page */
- FlashStatus = EE_Format();
- /* If erase/program operation was failed, a Flash error code is returned */
- if (FlashStatus != HAL_OK) return FlashStatus;
- }
- else if (PageStatus1 == ERASED) { /* Page0 valid, Page1 erased */
- pEraseInit.Sector = PAGE1_ID;
- pEraseInit.NbSectors = 1;
- pEraseInit.VoltageRange = VOLTAGE_RANGE;
- /* Erase Page1 */
- if (!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS)) {
- FlashStatus = HAL_FLASHEx_Erase(&pEraseInit, &SectorError);
- /* If erase operation was failed, a Flash error code is returned */
- if (FlashStatus != HAL_OK) return FlashStatus;
- }
- }
- else { /* Page0 valid, Page1 receive */
- /* Transfer data from Page0 to Page1 */
- int16_t x = -1;
- for (uint16_t VarIdx = 0; VarIdx < NB_OF_VAR; VarIdx++) {
- if ((*(__IO uint16_t*)(PAGE1_BASE_ADDRESS + 6)) == VirtAddVarTab[VarIdx])
- x = VarIdx;
-
- if (VarIdx != x) {
- /* Read the last variables' updates */
- uint16_t ReadStatus = EE_ReadVariable(VirtAddVarTab[VarIdx], &DataVar);
- /* In case variable corresponding to the virtual address was found */
- if (ReadStatus != 0x1) {
- /* Transfer the variable to the Page1 */
- uint16_t EepromStatus = EE_VerifyPageFullWriteVariable(VirtAddVarTab[VarIdx], DataVar);
- /* If program operation was failed, a Flash error code is returned */
- if (EepromStatus != HAL_OK) return EepromStatus;
- }
- }
- }
- /* Mark Page1 as valid */
- FlashStatus = HAL_FLASH_Program(TYPEPROGRAM_HALFWORD, PAGE1_BASE_ADDRESS, VALID_PAGE);
- /* If program operation was failed, a Flash error code is returned */
- if (FlashStatus != HAL_OK) return FlashStatus;
- pEraseInit.Sector = PAGE0_ID;
- pEraseInit.NbSectors = 1;
- pEraseInit.VoltageRange = VOLTAGE_RANGE;
- /* Erase Page0 */
- if (!EE_VerifyPageFullyErased(PAGE0_BASE_ADDRESS)) {
- /* As the last operation, simply return the result */
- return HAL_FLASHEx_Erase(&pEraseInit, &SectorError);
- }
- }
- break;
-
- default: /* Any other state -> format eeprom */
- /* Erase both Page0 and Page1 and set Page0 as valid page */
- /* As the last operation, simply return the result */
- return EE_Format();
- }
-
- return HAL_OK;
- }
-
- /**
- * @brief Verify if specified page is fully erased.
- * @param Address: page address
- * This parameter can be one of the following values:
- * @arg PAGE0_BASE_ADDRESS: Page0 base address
- * @arg PAGE1_BASE_ADDRESS: Page1 base address
- * @retval page fully erased status:
- * - 0: if Page not erased
- * - 1: if Page erased
- */
- uint16_t EE_VerifyPageFullyErased(uint32_t Address) {
- uint32_t ReadStatus = 1;
- /* Check each active page address starting from end */
- while (Address <= PAGE0_END_ADDRESS) {
- /* Get the current location content to be compared with virtual address */
- uint16_t AddressValue = (*(__IO uint16_t*)Address);
- /* Compare the read address with the virtual address */
- if (AddressValue != ERASED) {
- /* In case variable value is read, reset ReadStatus flag */
- ReadStatus = 0;
- break;
- }
- /* Next address location */
- Address += 4;
- }
- /* Return ReadStatus value: (0: Page not erased, 1: Sector erased) */
- return ReadStatus;
- }
-
- /**
- * @brief Returns the last stored variable data, if found, which correspond to
- * the passed virtual address
- * @param VirtAddress: Variable virtual address
- * @param Data: 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.
- */
- uint16_t EE_ReadVariable(uint16_t VirtAddress, uint16_t* Data) {
- uint16_t ReadStatus = 1;
-
- /* Get active Page for read operation */
- uint16_t ValidPage = EE_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 and end Addresses */
- uint32_t PageStartAddress = uint32_t(EEPROM_START_ADDRESS) + uint32_t(ValidPage * (PAGE_SIZE)),
- Address = PageStartAddress + PAGE_SIZE - 2;
-
- /* Check each active page address starting from end */
- while (Address > PageStartAddress + 2) {
- /* Get the current location content to be compared with virtual address */
- uint16_t AddressValue = (*(__IO uint16_t*)Address);
-
- /* Compare the read address with the virtual address */
- if (AddressValue == VirtAddress) {
- /* Get content of Address-2 which is variable value */
- *Data = (*(__IO uint16_t*)(Address - 2));
- /* In case variable value is read, reset ReadStatus flag */
- ReadStatus = 0;
- break;
- }
- else /* Next address location */
- Address -= 4;
- }
- /* Return ReadStatus value: (0: variable exist, 1: variable doesn't exist) */
- return ReadStatus;
- }
-
- /**
- * @brief Writes/upadtes variable data in EEPROM.
- * @param VirtAddress: Variable virtual address
- * @param Data: 16 bit data to be written
- * @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
- */
- uint16_t EE_WriteVariable(uint16_t VirtAddress, uint16_t Data) {
- /* Write the variable virtual address and value in the EEPROM */
- uint16_t Status = EE_VerifyPageFullWriteVariable(VirtAddress, Data);
-
- /* In case the EEPROM active page is full */
- if (Status == PAGE_FULL) /* Perform Page transfer */
- Status = EE_PageTransfer(VirtAddress, Data);
-
- /* Return last operation status */
- return Status;
- }
-
- /**
- * @brief Erases PAGE and PAGE1 and writes VALID_PAGE header to PAGE
- * @param None
- * @retval Status of the last operation (Flash write or erase) done during
- * EEPROM formating
- */
- static HAL_StatusTypeDef EE_Format() {
- FLASH_EraseInitTypeDef pEraseInit;
- pEraseInit.TypeErase = FLASH_TYPEERASE_SECTORS;
- pEraseInit.Sector = PAGE0_ID;
- pEraseInit.NbSectors = 1;
- pEraseInit.VoltageRange = VOLTAGE_RANGE;
-
- HAL_StatusTypeDef FlashStatus; // = HAL_OK
-
- /* Erase Page0 */
- if (!EE_VerifyPageFullyErased(PAGE0_BASE_ADDRESS)) {
- uint32_t SectorError;
- FlashStatus = HAL_FLASHEx_Erase(&pEraseInit, &SectorError);
- /* If erase operation was failed, a Flash error code is returned */
- if (FlashStatus != HAL_OK) return FlashStatus;
- }
- /* Set Page0 as valid page: Write VALID_PAGE at Page0 base address */
- FlashStatus = HAL_FLASH_Program(TYPEPROGRAM_HALFWORD, PAGE0_BASE_ADDRESS, VALID_PAGE);
- /* If program operation was failed, a Flash error code is returned */
- if (FlashStatus != HAL_OK) return FlashStatus;
-
- pEraseInit.Sector = PAGE1_ID;
- /* Erase Page1 */
- if (!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS)) {
- /* As the last operation, just return the result code */
- uint32_t SectorError;
- return HAL_FLASHEx_Erase(&pEraseInit, &SectorError);
- }
-
- return HAL_OK;
- }
-
- /**
- * @brief Find valid Page for write or read operation
- * @param Operation: operation to achieve on the valid page.
- * This parameter can be one of the following values:
- * @arg READ_FROM_VALID_PAGE: read operation from valid page
- * @arg WRITE_IN_VALID_PAGE: write operation from valid page
- * @retval Valid page number (PAGE or PAGE1) or NO_VALID_PAGE in case
- * of no valid page was found
- */
- static uint16_t EE_FindValidPage(uint8_t Operation) {
- /* Get Page0 and Page1 actual status */
- uint16_t PageStatus0 = (*(__IO uint16_t*)PAGE0_BASE_ADDRESS),
- PageStatus1 = (*(__IO uint16_t*)PAGE1_BASE_ADDRESS);
-
- /* Write or read operation */
- switch (Operation) {
- case WRITE_IN_VALID_PAGE: /* ---- Write operation ---- */
- if (PageStatus1 == VALID_PAGE) {
- /* Page0 receiving data */
- return (PageStatus0 == RECEIVE_DATA) ? PAGE0 : PAGE1;
- }
- else if (PageStatus0 == VALID_PAGE) {
- /* Page1 receiving data */
- return (PageStatus1 == RECEIVE_DATA) ? PAGE1 : PAGE0;
- }
- else
- return NO_VALID_PAGE; /* No valid Page */
-
- case READ_FROM_VALID_PAGE: /* ---- Read operation ---- */
- if (PageStatus0 == VALID_PAGE)
- return PAGE0; /* Page0 valid */
- else if (PageStatus1 == VALID_PAGE)
- return PAGE1; /* Page1 valid */
- else
- return NO_VALID_PAGE; /* No valid Page */
-
- default:
- return PAGE0; /* Page0 valid */
- }
- }
-
- /**
- * @brief Verify if active page is full and Writes variable in EEPROM.
- * @param VirtAddress: 16 bit virtual address of the variable
- * @param Data: 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 EE_VerifyPageFullWriteVariable(uint16_t VirtAddress, uint16_t Data) {
- /* Get valid Page for write operation */
- uint16_t ValidPage = EE_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 and end Addresses */
- uint32_t Address = uint32_t(EEPROM_START_ADDRESS) + uint32_t(ValidPage * (PAGE_SIZE)),
- PageEndAddress = Address + PAGE_SIZE - 1;
-
- /* 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 */
- HAL_StatusTypeDef FlashStatus = HAL_FLASH_Program(TYPEPROGRAM_HALFWORD, Address, Data);
- /* If program operation was failed, a Flash error code is returned */
- if (FlashStatus != HAL_OK) return FlashStatus;
- /* Set variable virtual address, return status */
- return HAL_FLASH_Program(TYPEPROGRAM_HALFWORD, Address + 2, VirtAddress);
- }
- else /* Next address location */
- Address += 4;
- }
-
- /* Return PAGE_FULL in case the valid page is full */
- return PAGE_FULL;
- }
-
- /**
- * @brief Transfers last updated variables data from the full Page to
- * an empty one.
- * @param VirtAddress: 16 bit virtual address of the variable
- * @param Data: 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 EE_PageTransfer(uint16_t VirtAddress, uint16_t Data) {
- /* Get active Page for read operation */
- uint16_t ValidPage = EE_FindValidPage(READ_FROM_VALID_PAGE);
- uint32_t NewPageAddress = EEPROM_START_ADDRESS;
- uint16_t OldPageId = 0;
-
- if (ValidPage == PAGE1) { /* Page1 valid */
- /* New page address where variable will be moved to */
- NewPageAddress = PAGE0_BASE_ADDRESS;
- /* Old page ID where variable will be taken from */
- OldPageId = PAGE1_ID;
- }
- else if (ValidPage == PAGE0) { /* Page0 valid */
- /* New page address where variable will be moved to */
- NewPageAddress = PAGE1_BASE_ADDRESS;
- /* Old page ID where variable will be taken from */
- OldPageId = PAGE0_ID;
- }
- else
- return NO_VALID_PAGE; /* No valid Page */
-
- /* Set the new Page status to RECEIVE_DATA status */
- HAL_StatusTypeDef FlashStatus = HAL_FLASH_Program(TYPEPROGRAM_HALFWORD, NewPageAddress, RECEIVE_DATA);
- /* If program operation was failed, a Flash error code is returned */
- if (FlashStatus != HAL_OK) return FlashStatus;
-
- /* Write the variable passed as parameter in the new active page */
- uint16_t EepromStatus = EE_VerifyPageFullWriteVariable(VirtAddress, Data);
- /* If program operation was failed, a Flash error code is returned */
- if (EepromStatus != HAL_OK) return EepromStatus;
-
- /* Transfer process: transfer variables from old to the new active page */
- for (uint16_t VarIdx = 0; VarIdx < NB_OF_VAR; VarIdx++) {
- if (VirtAddVarTab[VarIdx] != VirtAddress) { /* Check each variable except the one passed as parameter */
- /* Read the other last variable updates */
- uint16_t ReadStatus = EE_ReadVariable(VirtAddVarTab[VarIdx], &DataVar);
- /* In case variable corresponding to the virtual address was found */
- if (ReadStatus != 0x1) {
- /* Transfer the variable to the new active page */
- EepromStatus = EE_VerifyPageFullWriteVariable(VirtAddVarTab[VarIdx], DataVar);
- /* If program operation was failed, a Flash error code is returned */
- if (EepromStatus != HAL_OK) return EepromStatus;
- }
- }
- }
-
- FLASH_EraseInitTypeDef pEraseInit;
- pEraseInit.TypeErase = TYPEERASE_SECTORS;
- pEraseInit.Sector = OldPageId;
- pEraseInit.NbSectors = 1;
- pEraseInit.VoltageRange = VOLTAGE_RANGE;
-
- /* Erase the old Page: Set old Page status to ERASED status */
- uint32_t SectorError;
- FlashStatus = HAL_FLASHEx_Erase(&pEraseInit, &SectorError);
- /* If erase operation was failed, a Flash error code is returned */
- if (FlashStatus != HAL_OK) return FlashStatus;
-
- /* Set new Page status to VALID_PAGE status */
- /* As the last operation, just return the result code */
- return HAL_FLASH_Program(TYPEPROGRAM_HALFWORD, NewPageAddress, VALID_PAGE);
- }
-
- #endif // STM32GENERIC && (STM32F4 || STM32F7)
-
- /**
- * @}
- */
-
- /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/
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