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Author Topic: STM32F030 EEPROM Emulation  (Read 675 times)
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Cynetron
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« on: April 15, 2020, 05:30:55 17:30 »

Tested example of EEPROM Emulation on STM32F0 series

MAIN
Code:
#include "eeprom.h"
enum eeprom_num {
TON = 0x0000,
TOFF = 0x0001,
HOLD = 0x0002
};
uint16_t VirtAddVarTab[NB_OF_VAR] = {TON , TOFF, HOLD};

void main(void){
    /* EEPROM Init */
    HAL_FLASH_Unlock();
    EE_Init();

    /* Read from EEPROM */
    EE_ReadVariable(VirtAddVarTab[TON], &Settings.ton);
    EE_ReadVariable(VirtAddVarTab[TOFF], &Settings.toff);
    EE_ReadVariable(VirtAddVarTab[HOLD], &Settings.hold);
    /* Write to EEPROM */
    EE_WriteVariable(VirtAddVarTab[TON], Settings.ton);
    EE_WriteVariable(VirtAddVarTab[TOFF], Settings.toff);
    EE_WriteVariable(VirtAddVarTab[HOLD], Settings.hold);
}

eeprom.h
Code:
/**
  ******************************************************************************
  * @file    EEPROM_Emulation/inc/eeprom.h
  * @author  MCD Application Team
  * @brief   This file contains all the functions prototypes for the EEPROM
  *          emulation firmware library.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2016 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.
  *
  ******************************************************************************
  */

/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __EEPROM_H
#define __EEPROM_H

/* Includes ------------------------------------------------------------------*/
#include "stm32f0xx_hal.h"

/* Exported constants --------------------------------------------------------*/

/* Base address of the Flash sectors */
#define ADDR_FLASH_PAGE_0     ((uint32_t)0x08000000) /* Base @ of Page 0, 1 Kbytes */
#define ADDR_FLASH_PAGE_1     ((uint32_t)0x08000400) /* Base @ of Page 1, 1 Kbytes */
#define ADDR_FLASH_PAGE_2     ((uint32_t)0x08000800) /* Base @ of Page 2, 1 Kbytes */
#define ADDR_FLASH_PAGE_3     ((uint32_t)0x08000C00) /* Base @ of Page 3, 1 Kbytes */
#define ADDR_FLASH_PAGE_4     ((uint32_t)0x08001000) /* Base @ of Page 4, 1 Kbytes */
#define ADDR_FLASH_PAGE_5     ((uint32_t)0x08001400) /* Base @ of Page 5, 1 Kbytes */
#define ADDR_FLASH_PAGE_6     ((uint32_t)0x08001800) /* Base @ of Page 6, 1 Kbytes */
#define ADDR_FLASH_PAGE_7     ((uint32_t)0x08001C00) /* Base @ of Page 7, 1 Kbytes */
#define ADDR_FLASH_PAGE_8     ((uint32_t)0x08002000) /* Base @ of Page 8, 1 Kbytes */
#define ADDR_FLASH_PAGE_9     ((uint32_t)0x08002400) /* Base @ of Page 9, 1 Kbytes */
#define ADDR_FLASH_PAGE_10    ((uint32_t)0x08002800) /* Base @ of Page 10, 1 Kbytes */
#define ADDR_FLASH_PAGE_11    ((uint32_t)0x08002C00) /* Base @ of Page 11, 1 Kbytes */
#define ADDR_FLASH_PAGE_12    ((uint32_t)0x08003000) /* Base @ of Page 12, 1 Kbytes */
#define ADDR_FLASH_PAGE_13    ((uint32_t)0x08003400) /* Base @ of Page 13, 1 Kbytes */
#define ADDR_FLASH_PAGE_14    ((uint32_t)0x08003800) /* Base @ of Page 14, 1 Kbytes */
#define ADDR_FLASH_PAGE_15    ((uint32_t)0x08003C00) /* Base @ of Page 15, 1 Kbytes */
#define ADDR_FLASH_PAGE_16    ((uint32_t)0x08004000) /* Base @ of Page 16, 1 Kbytes */
#define ADDR_FLASH_PAGE_17    ((uint32_t)0x08004400) /* Base @ of Page 17, 1 Kbytes */
#define ADDR_FLASH_PAGE_18    ((uint32_t)0x08004800) /* Base @ of Page 18, 1 Kbytes */
#define ADDR_FLASH_PAGE_19    ((uint32_t)0x08004C00) /* Base @ of Page 19, 1 Kbytes */
#define ADDR_FLASH_PAGE_20    ((uint32_t)0x08005000) /* Base @ of Page 20, 1 Kbytes */
#define ADDR_FLASH_PAGE_21    ((uint32_t)0x08005400) /* Base @ of Page 21, 1 Kbytes */
#define ADDR_FLASH_PAGE_22    ((uint32_t)0x08005800) /* Base @ of Page 22, 1 Kbytes */
#define ADDR_FLASH_PAGE_23    ((uint32_t)0x08005C00) /* Base @ of Page 23, 1 Kbytes */
#define ADDR_FLASH_PAGE_24    ((uint32_t)0x08006000) /* Base @ of Page 24, 1 Kbytes */
#define ADDR_FLASH_PAGE_25    ((uint32_t)0x08006400) /* Base @ of Page 25, 1 Kbytes */
#define ADDR_FLASH_PAGE_26    ((uint32_t)0x08006800) /* Base @ of Page 26, 1 Kbytes */
#define ADDR_FLASH_PAGE_27    ((uint32_t)0x08006C00) /* Base @ of Page 27, 1 Kbytes */
#define ADDR_FLASH_PAGE_28    ((uint32_t)0x08007000) /* Base @ of Page 28, 1 Kbytes */
#define ADDR_FLASH_PAGE_29    ((uint32_t)0x08007400) /* Base @ of Page 29, 1 Kbytes */
#define ADDR_FLASH_PAGE_30    ((uint32_t)0x08007800) /* Base @ of Page 30, 1 Kbytes */
#define ADDR_FLASH_PAGE_31    ((uint32_t)0x08007C00) /* Base @ of Page 31, 1 Kbytes */
#define ADDR_FLASH_PAGE_32    ((uint32_t)0x08008000) /* Base @ of Page 32, 1 Kbytes */
#define ADDR_FLASH_PAGE_33    ((uint32_t)0x08008400) /* Base @ of Page 33, 1 Kbytes */
#define ADDR_FLASH_PAGE_34    ((uint32_t)0x08008800) /* Base @ of Page 34, 1 Kbytes */
#define ADDR_FLASH_PAGE_35    ((uint32_t)0x08008C00) /* Base @ of Page 35, 1 Kbytes */
#define ADDR_FLASH_PAGE_36    ((uint32_t)0x08009000) /* Base @ of Page 36, 1 Kbytes */
#define ADDR_FLASH_PAGE_37    ((uint32_t)0x08009400) /* Base @ of Page 37, 1 Kbytes */
#define ADDR_FLASH_PAGE_38    ((uint32_t)0x08009800) /* Base @ of Page 38, 1 Kbytes */
#define ADDR_FLASH_PAGE_39    ((uint32_t)0x08009C00) /* Base @ of Page 39, 1 Kbytes */
#define ADDR_FLASH_PAGE_40    ((uint32_t)0x0800A000) /* Base @ of Page 40, 1 Kbytes */
#define ADDR_FLASH_PAGE_41    ((uint32_t)0x0800A400) /* Base @ of Page 41, 1 Kbytes */
#define ADDR_FLASH_PAGE_42    ((uint32_t)0x0800A800) /* Base @ of Page 42, 1 Kbytes */
#define ADDR_FLASH_PAGE_43    ((uint32_t)0x0800AC00) /* Base @ of Page 43, 1 Kbytes */
#define ADDR_FLASH_PAGE_44    ((uint32_t)0x0800B000) /* Base @ of Page 44, 1 Kbytes */
#define ADDR_FLASH_PAGE_45    ((uint32_t)0x0800B400) /* Base @ of Page 45, 1 Kbytes */
#define ADDR_FLASH_PAGE_46    ((uint32_t)0x0800B800) /* Base @ of Page 46, 1 Kbytes */
#define ADDR_FLASH_PAGE_47    ((uint32_t)0x0800BC00) /* Base @ of Page 47, 1 Kbytes */
#define ADDR_FLASH_PAGE_48    ((uint32_t)0x0800C000) /* Base @ of Page 48, 1 Kbytes */
#define ADDR_FLASH_PAGE_49    ((uint32_t)0x0800C400) /* Base @ of Page 49, 1 Kbytes */
#define ADDR_FLASH_PAGE_50    ((uint32_t)0x0800C800) /* Base @ of Page 50, 1 Kbytes */
#define ADDR_FLASH_PAGE_51    ((uint32_t)0x0800CC00) /* Base @ of Page 51, 1 Kbytes */
#define ADDR_FLASH_PAGE_52    ((uint32_t)0x0800D000) /* Base @ of Page 52, 1 Kbytes */
#define ADDR_FLASH_PAGE_53    ((uint32_t)0x0800D400) /* Base @ of Page 53, 1 Kbytes */
#define ADDR_FLASH_PAGE_54    ((uint32_t)0x0800D800) /* Base @ of Page 54, 1 Kbytes */
#define ADDR_FLASH_PAGE_55    ((uint32_t)0x0800DC00) /* Base @ of Page 55, 1 Kbytes */
#define ADDR_FLASH_PAGE_56    ((uint32_t)0x0800E000) /* Base @ of Page 56, 1 Kbytes */
#define ADDR_FLASH_PAGE_57    ((uint32_t)0x0800E400) /* Base @ of Page 57, 1 Kbytes */
#define ADDR_FLASH_PAGE_58    ((uint32_t)0x0800E800) /* Base @ of Page 58, 1 Kbytes */
#define ADDR_FLASH_PAGE_59    ((uint32_t)0x0800EC00) /* Base @ of Page 59, 1 Kbytes */
#define ADDR_FLASH_PAGE_60    ((uint32_t)0x0800F000) /* Base @ of Page 60, 1 Kbytes */
#define ADDR_FLASH_PAGE_61    ((uint32_t)0x0800F400) /* Base @ of Page 61, 1 Kbytes */
#define ADDR_FLASH_PAGE_62    ((uint32_t)0x0800F800) /* Base @ of Page 62, 1 Kbytes */
#define ADDR_FLASH_PAGE_63    ((uint32_t)0x0800FC00) /* Base @ of Page 63, 1 Kbytes */


/* Define the size of the sectors to be used */
#define PAGE_SIZE               (uint32_t)FLASH_PAGE_SIZE  /* Page size */

/* EEPROM start address in Flash */
#define EEPROM_START_ADDRESS  ((uint32_t)ADDR_FLASH_PAGE_60) /* EEPROM emulation start address */

/* Pages 0 and 1 base and end addresses */
#define PAGE0_BASE_ADDRESS    ((uint32_t)(EEPROM_START_ADDRESS + 0x0000))
#define PAGE0_END_ADDRESS     ((uint32_t)(EEPROM_START_ADDRESS + (PAGE_SIZE - 1)))

#define PAGE1_BASE_ADDRESS    ((uint32_t)(EEPROM_START_ADDRESS + PAGE_SIZE))
#define PAGE1_END_ADDRESS     ((uint32_t)(EEPROM_START_ADDRESS + (2 * PAGE_SIZE - 1)))

/* 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)0x0f)

/* Exported types ------------------------------------------------------------*/
/* Exported macro ------------------------------------------------------------*/
/* Exported functions ------------------------------------------------------- */
uint16_t EE_Init(void);
uint16_t EE_ReadVariable(uint16_t VirtAddress, volatile uint16_t* Data);
uint16_t EE_WriteVariable(uint16_t VirtAddress, volatile uint16_t Data);

#endif /* __EEPROM_H */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

eeprom.c
Code:
/**
  ******************************************************************************
  * @file    EEPROM_Emulation/src/eeprom.c
  * @author  MCD Application Team
  * @brief   This file provides all the EEPROM emulation firmware functions.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2016 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 "eeprom.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];

/* 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);

/**
  * @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;
  uint32_t page_error = 0;
  FLASH_EraseInitTypeDef s_eraseinit;


  /* Get Page0 status */
  pagestatus0 = (*(__IO uint16_t*)PAGE0_BASE_ADDRESS);
  /* Get Page1 status */
  pagestatus1 = (*(__IO uint16_t*)PAGE1_BASE_ADDRESS);

  /* Fill EraseInit structure*/
  s_eraseinit.TypeErase   = FLASH_TYPEERASE_PAGES;
  s_eraseinit.PageAddress = PAGE0_BASE_ADDRESS;
  s_eraseinit.NbPages     = 1;
 
  /* 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 = HAL_FLASHEx_Erase(&s_eraseinit, &page_error);
          /* 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 = HAL_FLASHEx_Erase(&s_eraseinit, &page_error);
          /* If erase operation was failed, a Flash error code is returned */
          if (flashstatus != HAL_OK)
          {
            return flashstatus;
          }
        }
        /* Mark Page1 as valid */
        flashstatus = HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD, 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 = HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD, PAGE0_BASE_ADDRESS, VALID_PAGE);
        /* If program operation was failed, a Flash error code is returned */
        if (flashstatus != HAL_OK)
        {
          return flashstatus;
        }
        s_eraseinit.TypeErase   = FLASH_TYPEERASE_PAGES;
        s_eraseinit.PageAddress = PAGE1_BASE_ADDRESS;
        s_eraseinit.NbPages     = 1;
        /* Erase Page1 */
        if(!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS))
        {
          flashstatus = HAL_FLASHEx_Erase(&s_eraseinit, &page_error);
          /* 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 */
      {
        s_eraseinit.TypeErase   = FLASH_TYPEERASE_PAGES;
        s_eraseinit.PageAddress = PAGE1_BASE_ADDRESS;
        s_eraseinit.NbPages     = 1;
        /* Erase Page1 */
        if(!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS))
        {
          flashstatus = HAL_FLASHEx_Erase(&s_eraseinit, &page_error);
          /* If erase operation was failed, a Flash error code is returned */
          if (flashstatus != HAL_OK)
          {
            return flashstatus;
          }
        }
        /* Mark Page0 as valid */
        flashstatus = HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD, 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 */
      {
        s_eraseinit.TypeErase   = FLASH_TYPEERASE_PAGES;
        s_eraseinit.PageAddress = PAGE1_BASE_ADDRESS;
        s_eraseinit.NbPages     = 1;
        /* Erase Page1 */
        if(!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS))
        {
          flashstatus = HAL_FLASHEx_Erase(&s_eraseinit, &page_error);
          /* 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 = HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD, PAGE1_BASE_ADDRESS, VALID_PAGE);       
        /* If program operation was failed, a Flash error code is returned */
        if (flashstatus != HAL_OK)
        {
          return flashstatus;
        }
        s_eraseinit.TypeErase   = FLASH_TYPEERASE_PAGES;
        s_eraseinit.PageAddress = PAGE0_BASE_ADDRESS;
        s_eraseinit.NbPages     = 1;
        /* Erase Page0 */
        if(!EE_VerifyPageFullyErased(PAGE0_BASE_ADDRESS))
        {
          flashstatus = HAL_FLASHEx_Erase(&s_eraseinit, &page_error);
          /* 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;
   
  /* Check each active page address starting from end */
  while (Address <= PAGE0_END_ADDRESS)
  {
    /* 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: Page 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, volatile 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, volatile 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);
  }

  /* 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;
  uint32_t page_error = 0;
  FLASH_EraseInitTypeDef s_eraseinit;

  s_eraseinit.TypeErase   = FLASH_TYPEERASE_PAGES;
  s_eraseinit.PageAddress = PAGE0_BASE_ADDRESS;
  s_eraseinit.NbPages     = 1;
  /* Erase Page0 */
  if(!EE_VerifyPageFullyErased(PAGE0_BASE_ADDRESS))
  {
    flashstatus = HAL_FLASHEx_Erase(&s_eraseinit, &page_error);
    /* If erase operation was failed, a Flash error code is returned */
    if (flashstatus != HAL_OK)
    {
      return flashstatus;
    }
  }
  /* Set Page0 as valid page: Write VALID_PAGE at Page0 base address */
  flashstatus = HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD, PAGE0_BASE_ADDRESS, VALID_PAGE);
  /* If program operation was failed, a Flash error code is returned */
  if (flashstatus != HAL_OK)
  {
    return flashstatus;
  }

  s_eraseinit.PageAddress = PAGE1_BASE_ADDRESS;
  /* Erase Page1 */
  if(!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS))
  { 
    flashstatus = HAL_FLASHEx_Erase(&s_eraseinit, &page_error);
    /* 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)
  {
    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 = HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD, address, Data);       
      /* If program operation was failed, a Flash error code is returned */
      if (flashstatus != HAL_OK)
      {
        return flashstatus;
      }
      /* Set variable virtual address */
      flashstatus = HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD, address + 2, VirtAddress);       
      /* 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;
  uint32_t page_error = 0;
  FLASH_EraseInitTypeDef s_eraseinit;

  /* 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 = HAL_FLASH_Program(FLASH_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 */
  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;
        }
      }
    }
  }

  s_eraseinit.TypeErase   = FLASH_TYPEERASE_PAGES;
  s_eraseinit.PageAddress = oldpageid;
  s_eraseinit.NbPages     = 1;
 
  /* Erase the old Page: Set old Page status to ERASED status */
  flashstatus = HAL_FLASHEx_Erase(&s_eraseinit, &page_error); 
  /* 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 = HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD, 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 STMicroelectronics *****END OF FILE****/
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millegps
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« Reply #1 on: May 07, 2020, 06:08:09 18:08 »

Is it AN4061 from ST or something similar with improvements?

Did you test also flash endurance?

ST declares around 10k reliable program/erase cycles per page. I tested 4-5 MCU and flash failed after 50-60k cycles, so I think 10k is conservative.
At the end I didn't test also AN4061 (10k cycles is ok and safe for my application), but you can get a big improvement!
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