FLASH模拟EEPROM的方法_eeprom有page0吗

作者：小小林熬夜学编程 | 2024-06-05 11:22:52

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eeprom有page0吗

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>&copy; 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>&copy; 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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