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I have some difficulties to use the emulated EEPROM library from STM32 for an STM32F4 microcontroller. I nearly always get a PGPERR and PGSERR back when I try to write to the flash. PGSERR seems to be set because of wrong parallelism chosen. When I check the Register FLASH->CR->PSIZE I see sometimes a 0x0 and sometimes a 0x1 and 0x2, so I don't from where this could be changed at all and also with 0x2 it seems still to give back a PGSERR. I also tried an initialization of the register itself, but this throw me a hard fault when I call a sprintf then.

I changed also from 16kByte Pages to 128kByte pages, this does not throw a hardfault anymore when I call sprintf(), but I seems not to save any variable at all in the EEPROM.

Anyone an idea why this errors occur?

EDIT 1: When I set PSIZE to 0x2 for 128kByte pages, i get no more a PGPERR, but still a PGSERR. I used the following commads to write PSIZE:

FLASH->CR&=~((1<<FLASH_CR_PSIZE_0)|(1<<FLASH_CR_PSIZE_1));
FLASH->CR|=(1<<FLASH_CR_PSIZE_1);

What I further see is, that the FLASH->CR Register stays sometimes only at 0x0.

Datasheet: (Page 75 for memory mapping Flash) https://www.st.com/content/ccc/resource/technical/document/reference_manual/3d/6d/5a/66/b4/99/40/d4/DM00031020.pdf/files/DM00031020.pdf/jcr:content/translations/en.DM00031020.pdf

eeprom.h:

/**
  ******************************************************************************
  * @file    EEPROM/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) 2017 STMicroelectronics International N.V. 
  * All rights reserved.</center></h2>
  *
  * Redistribution and use in source and binary forms, with or without 
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  ******************************************************************************
  */ 

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

/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_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

/* Base address of the Flash sectors */
#define ADDR_FLASH_PAGE_0   ((uint32_t)0x08020000 ) /* Base @ of Page 0, 16Kbytes @sector 2*/
#define ADDR_FLASH_PAGE_1   ((uint32_t)0x08040000) /* Base @ of Page 1, 16Kbytes @sector 3*/

/* Define the size of the sectors to be used */
#define PAGE_SIZE               (uint32_t)0x20000  /* Page size = 128KByte */

/* 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)ADDR_FLASH_PAGE_0) /* EEPROM emulation start address:
                                                  from sector2 : after 32KByte of used
                                                  Flash memory */

/* Pages 0 and 1 base and end addresses */
#define PAGE0_BASE_ADDRESS    ((uint32_t)(EEPROM_START_ADDRESS + 0x0000)) //See Reference Manual for Flash Sectors
#define PAGE0_END_ADDRESS     ((uint32_t)(EEPROM_START_ADDRESS + (PAGE_SIZE - 1)))
#define PAGE0_ID               FLASH_SECTOR_5

#define PAGE1_BASE_ADDRESS    ((uint32_t)(ADDR_FLASH_PAGE_1))
#define PAGE1_END_ADDRESS     ((uint32_t)(ADDR_FLASH_PAGE_1 + (PAGE_SIZE - 1)))
#define PAGE1_ID               FLASH_SECTOR_6

/* 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)32)

/* Exported types ------------------------------------------------------------*/
/* 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****/

eeprom.c /EE_VerifyPageFullWriteVariable -> I changed everywhere in eeprom.c from TYPEPROGRAM_HALFWORD to TYPEPROGRAM_WORD

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(TYPEPROGRAM_WORD, 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(TYPEPROGRAM_WORD, 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;
}
\$\endgroup\$

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