本帖最后由 tyw 于 2022-2-21 12:13 编辑
FLASH模拟EEPROM的方法
https://blog.csdn.net/Terrys0518/article/details/105397253
工业中经常使用EEPROM（电可擦除可编程存储器）来存储更新数据，为降低成本，可以使用FLASH代替。
EEPROM 仿真可以通过多种方式实现，但要注意 Flash 限制和产品要求。下面详述的方法要求为非易失性数据分配至少两个相同大小的 Flash 扇区：一个在开始时擦除，支持逐字编程；另一个在需要对前一扇区执行垃圾回收时接管工作。占用每扇区前半个字（16 位）的头字段指示扇区的状态。在本文档的其余部分，将每一个扇区视为一页，这些页分别称为Page0 和 Page1。
| 0x08000001(0xFFFF|0xFFFF) | | 虚拟地址1 | 1 | | 虚拟地址2 | 2 | | 虚拟地址3 | 3 | | 虚拟地址4 | 4 |
写入数据 | 0x00 | 0x04 | 0x08 | 0x0C | ········ | 0x3FF0 | 0x3FF4 | 0x3FF8 | 0x3FFC | | 16位地址 | 16位数据 | 16位地址 | 16位数据 | 16位地址 | 16位数据 | | | | | | | | | | | 16位地址 | 16位数据 |
flash默认擦除状态，0xFFFF，从头向后检查，检查到数据地址位0xFFFF，即填入地址并写入数据。 写满后，将该Page的有效数据，都刷新到新的Page,并写入该新的数据。 读数据 从后向前对比，当查询地址与flash中地址一致，取出该值，跳出循环。 /** ****************************************************************************** * @file EEPROM/EEPROM_Emulation/inc/eeprom.h * @author MCD Application Team * @version V1.3.2 * @date 13-November-2015 * @brief This file contains all the functions prototypes for the EEPROM * emulation firmware library. ****************************************************************************** * @Attention * * <h2><center>© COPYRIGHT(c) 2015 STMicroelectronics</center></h2> * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * 1. Redistributions 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 its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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. * ****************************************************************************** *////*********************************************************************************** * Copyright (C),2008-2020,Terry Tech.Co.,Ltd * File name: feeprom.h * Author: Terry Version: 1.0 * Description: stm32F103 一页1K， 待存储的数据 < 256 个 uint6_t 个数据， * 不增大Page的情况下（2 page情况下），参数数量原则越少越好 * 建议参数20个以内，这样使用寿命约为 10 X 10000 即10万次 * Others: * Function List: * *//* Define to prevent recursive inclusion -------------------------------------*/#ifndef __EEPROM_H#define __EEPROM_H/* Includes ------------------------------------------------------------------*/#include "stm32f1xx_hal.h"/* Exported constants --------------------------------------------------------*//* EEPROM emulation firmware error codes */#define EE_OK (uint32_t)HAL_OK#define EE_ERROR (uint32_t)HAL_ERROR#define EE_BUSY (uint32_t)HAL_BUSY#define EE_TIMEOUT (uint32_t)HAL_TIMEOUT/* Define the size of the sectors to be used */#define PAGE_SIZE (uint32_t)0x400 /* Page size = 1KByte *//* Device voltage range supposed to be [2.7V to 3.6V], the operation will be done by word *///#define VOLTAGE_RANGE (uint8_t)VOLTAGE_RANGE_3/* EEPROM start address in Flash */#define EEPROM_START_ADDRESS ((uint32_t)0x08018000) /* EEPROM emulation start address: from sector2 : after 1KByte of used Flash memory *//* 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 PAGE0_ID FLASH_SECTOR_2#define PAGE1_BASE_ADDRESS ((uint32_t)(EEPROM_START_ADDRESS + PAGE_SIZE))#define PAGE1_END_ADDRESS ((uint32_t)(EEPROM_START_ADDRESS + (2 * PAGE_SIZE - 1)))//#define PAGE1_ID FLASH_SECTOR_3// 更多页的负载均衡使用方法，此处略过 Terry 2020.03.01/////* Used Flash pages for EEPROM emulation */#define PAGE0 ((uint16_t)0x0000)#define PAGE1 ((uint16_t)0x0001) /* Page nb between PAGE0_BASE_ADDRESS & PAGE1_BASE_ADDRESS*//* 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)/* Variables' number */#define NB_OF_VAR ((uint8_t)0x03)/* Exported types ------------------------------------------------------------*/#define EE_UNLOCK() HAL_FLASH_Unlock()#define EE_LOCK() HAL_FLASH_Lock()/* Exported macro ------------------------------------------------------------*//* Exported functions ------------------------------------------------------- */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);#endif /* __EEPROM_H *//************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
/* * feeprom.c * * Created on: Mar 1, 2020 * Author: lenovo *//** ****************************************************************************** * @file EEPROM/EEPROM_Emulation/src/eeprom.c * @author MCD Application Team * @version V1.3.2 * @date 13-November-2015 * @brief This file provides all the EEPROM emulation firmware functions. ****************************************************************************** * @Attention * * <h2><center>© COPYRIGHT(c) 2015 STMicroelectronics</center></h2> * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * 1. Redistributions 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 its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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 * @{ *//* Includes ------------------------------------------------------------------*/#include "feeprom.h"#include "u_log.h"/* Private typedef -----------------------------------------------------------*//* Private define ------------------------------------------------------------*//* Private macro -------------------------------------------------------------*//* 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 */extern uint16_t VirtAddVarTab[NB_OF_VAR]; /*虚拟地址表，不允许取值0xFFFF*//* Private function prototypes -----------------------------------------------*//* Private functions ---------------------------------------------------------*/static HAL_StatusTypeDef EE_Format(void);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);/*擦除页或者扇区 硬件接口函数*/static HAL_StatusTypeDef EE_Erase_Page(uint32_t addr){ FLASH_EraseInitTypeDef pEraseInit; HAL_StatusTypeDef FlashStatus; uint32_t SectorError = 0; pEraseInit.TypeErase = FLASH_TYPEERASE_PAGES; pEraseInit.PageAddress = addr; pEraseInit.NbPages = 1; EE_UNLOCK(); FlashStatus = HAL_FLASHEx_Erase(&pEraseInit, &SectorError); EE_LOCK(); return FlashStatus;}/*向Flash 写一个半字 硬件接口函数*/static HAL_StatusTypeDef EE_WriteHFWORD(uint32_t addr,uint16_t data){ HAL_StatusTypeDef FlashStatus; EE_UNLOCK(); FlashStatus = HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD, addr, data); EE_LOCK(); return FlashStatus;}/** * @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_Init(void){ uint16_t PageStatus0 = 6, PageStatus1 = 6; uint16_t VarIdx = 0; uint16_t EepromStatus = 0, ReadStatus = 0; int16_t x = -1; HAL_StatusTypeDef FlashStatus; /* 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 */ if(!EE_VerifyPageFullyErased(PAGE0_BASE_ADDRESS)) { FlashStatus = EE_Erase_Page(PAGE0_BASE_ADDRESS); /* If erase operation was failed, a Flash error code is returned */ if (FlashStatus != HAL_OK) { return FlashStatus; } } } else if (PageStatus1 == RECEIVE_DATA) /* Page0 erased, Page1 receive */ { /* Erase Page0 */ if(!EE_VerifyPageFullyErased(PAGE0_BASE_ADDRESS)) { FlashStatus = EE_Erase_Page(PAGE0_BASE_ADDRESS); /* If erase operation was failed, a Flash error code is returned */ if (FlashStatus != HAL_OK) { return FlashStatus; } } /* Mark Page1 as valid */ FlashStatus = EE_WriteHFWORD(PAGE1_BASE_ADDRESS, VALID_PAGE); /* If program operation was failed, a Flash error code is returned */ if (FlashStatus != HAL_OK) { 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 = EE_Format(); /* If erase/program operation was failed, a Flash error code is returned */ if (FlashStatus != HAL_OK) { return FlashStatus; } } break; case RECEIVE_DATA: if (PageStatus1 == VALID_PAGE) /* Page0 receive, Page1 valid */ { /* Transfer data from Page1 to Page0 */ for (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 */ 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 */ 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 = EE_WriteHFWORD(PAGE0_BASE_ADDRESS, VALID_PAGE); /* If program operation was failed, a Flash error code is returned */ if (FlashStatus != HAL_OK) { return FlashStatus; } /* Erase Page1 */ if(!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS)) { FlashStatus = EE_Erase_Page(PAGE1_BASE_ADDRESS); /* If erase operation was failed, a Flash error code is returned */ if (FlashStatus != HAL_OK) { return FlashStatus; } } } else if (PageStatus1 == ERASED) /* Page0 receive, Page1 erased */ { /* Erase Page1 */ if(!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS)) { FlashStatus = EE_Erase_Page(PAGE1_BASE_ADDRESS); /* If erase operation was failed, a Flash error code is returned */ if (FlashStatus != HAL_OK) { return FlashStatus; } } /* Mark Page0 as valid */ FlashStatus = EE_WriteHFWORD(PAGE0_BASE_ADDRESS, VALID_PAGE); /* If program operation was failed, a Flash error code is returned */ if (FlashStatus != HAL_OK) { return FlashStatus; } } else /* 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; } } 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 */ { /* Erase Page1 */ if(!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS)) { FlashStatus = EE_Erase_Page(PAGE1_BASE_ADDRESS); /* 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 */ for (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 */ 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 */ 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 = EE_WriteHFWORD(PAGE1_BASE_ADDRESS, VALID_PAGE); /* If program operation was failed, a Flash error code is returned */ if (FlashStatus != HAL_OK) { return FlashStatus; } /* Erase Page0 */ if(!EE_VerifyPageFullyErased(PAGE0_BASE_ADDRESS)) { FlashStatus = EE_Erase_Page(PAGE0_BASE_ADDRESS); /* If erase operation was failed, a Flash error code is returned */ if (FlashStatus != HAL_OK) { return FlashStatus; } } } break; default: /* Any other 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; } break; } 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; uint16_t AddressValue = 0x5555; uint32_t EndPageAddr = Address + PAGE_SIZE - 1 ; /* Check each active page address starting from end */ while (Address <= EndPageAddr) { /* 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 != ERASED) { /* In case variable value is read, reset ReadStatus flag */ ReadStatus = 0; break; } /* Next address location */ Address = 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 ValidPage = PAGE0; uint16_t AddressValue = 0x5555, ReadStatus = 1; uint32_t Address = EEPROM_START_ADDRESS, PageStartAddress = EEPROM_START_ADDRESS; /* Get active Page for read operation */ 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 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 == 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 = 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){ uint16_t Status = 0; /* Write the variable virtual address and value in the EEPROM */ 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); Log_e("%d",Status); } /* 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(void){ HAL_StatusTypeDef FlashStatus = HAL_OK; /* Erase Page0 */ if(!EE_VerifyPageFullyErased(PAGE0_BASE_ADDRESS)) { FlashStatus = EE_Erase_Page(PAGE0_BASE_ADDRESS); /* 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 = EE_WriteHFWORD(PAGE0_BASE_ADDRESS, VALID_PAGE); /* If program operation was failed, a Flash error code is returned */ if (FlashStatus != HAL_OK) { return FlashStatus; } /* Erase Page1 */ if(!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS)) { FlashStatus = EE_Erase_Page(PAGE1_BASE_ADDRESS); /* If erase operation was failed, a Flash error code is returned */ if (FlashStatus != HAL_OK) { return FlashStatus; } } 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){ uint16_t PageStatus0 = 6, PageStatus1 = 6; /* Get Page0 actual status */ PageStatus0 = (*(__IO uint16_t*)PAGE0_BASE_ADDRESS); /* Get Page1 actual status */ 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 */ if (PageStatus0 == RECEIVE_DATA) { return PAGE0; /* Page0 valid */ } else { return PAGE1; /* Page1 valid */ } } else if (PageStatus0 == VALID_PAGE) { /* Page1 receiving data */ if (PageStatus1 == RECEIVE_DATA) { return PAGE1; /* Page1 valid */ } else { return PAGE0; /* Page0 valid */ } } 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){ HAL_StatusTypeDef FlashStatus = HAL_OK; uint16_t ValidPage = PAGE0; uint32_t Address = EEPROM_START_ADDRESS, PageEndAddress = EEPROM_START_ADDRESS+PAGE_SIZE; /* Get valid Page for write operation */ ValidPage = EE_FindValidPage(WRITE_IN_VALID_PAGE); /* Check if there is no valid page */ if (ValidPage == NO_VALID_PAGE) { Log_e("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 - 1) + (uint32_t)((ValidPage + 1) * 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 = EE_WriteHFWORD(Address, Data); /* If program operation was failed, a Flash error code is returned */ if (FlashStatus != HAL_OK) { Log_e("HAL_FLASH_Program err"); return FlashStatus; } /* Set variable virtual address */ FlashStatus = EE_WriteHFWORD(Address + 2, VirtAddress);// Log_e("E %x",Address); /* 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 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){ HAL_StatusTypeDef FlashStatus = HAL_OK; uint32_t NewPageAddress = EEPROM_START_ADDRESS; uint32_t OldPageId=0; uint16_t ValidPage = PAGE0, VarIdx = 0; uint16_t EepromStatus = 0, ReadStatus = 0; /* Get active Page for read operation */ ValidPage = EE_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 ID where variable will be taken from */ OldPageId = PAGE1_BASE_ADDRESS; } 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_BASE_ADDRESS; } else { return NO_VALID_PAGE; /* No valid Page */ } /* Set the new Page status to RECEIVE_DATA status */ FlashStatus = EE_WriteHFWORD(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 */ 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 (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 */ 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; } } } } /* Erase the old Page: Set old Page status to ERASED status */ FlashStatus = EE_Erase_Page(OldPageId); /* 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 */ FlashStatus = EE_WriteHFWORD(NewPageAddress, VALID_PAGE); /* If program operation was failed, a Flash error code is returned */ if (FlashStatus != HAL_OK) { return FlashStatus; } /* Return last operation flash status */ return FlashStatus;}/** * @} *//******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/ stm32 flash 每个扇区的读写次数大约1万次，当存储数据较多时，可以增加每组Flash 页的数量，实现损耗均衡，增加Flash可擦写次数。
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