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