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Need Guidance on EEPROM Implementation in STM32L4R5ZI-P Microcontroller

yashaswini
Associate II

Hello STMicroelectronics community,

I am currently working on a project that involves using EEPROM memory with an STM32 microcontroller, specifically [STM32L4R5ZI-P]. microcontroller that does not have internal EEPROM, so I need to use the Flash memory for EEPROM emulation. I've installed the xCube EEPROM package, which provides driver layers and specifies the memory address to use.

However, I'm currently facing an issue with not able write or read from Address[0x080FF000U] , while working with flash that is returning with an error = 160, i will be sharing the snippet for your reference.

with an error valuewith an error valueScreenshot (8).pngScreenshot (6).pngIntializationIntialization

HAL_StatusTypeDef HAL_FLASH_Program(uint32_t TypeProgram, uint32_t Address, uint64_t Data)
{
HAL_StatusTypeDef status;
uint32_t prog_bit = 0;

/* Process Locked */
__HAL_LOCK(&pFlash);

/* Check the parameters */
assert_param(IS_FLASH_TYPEPROGRAM(TypeProgram));

/* Wait for last operation to be completed */
status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);

if(status == HAL_OK)
{
pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;

/* Deactivate the data cache if they are activated to avoid data misbehavior */
if(READ_BIT(FLASH->ACR, FLASH_ACR_DCEN) != 0U)
{
/* Disable data cache */
__HAL_FLASH_DATA_CACHE_DISABLE();
pFlash.CacheToReactivate = FLASH_CACHE_DCACHE_ENABLED;
}
else
{
pFlash.CacheToReactivate = FLASH_CACHE_DISABLED;
}

if(TypeProgram == FLASH_TYPEPROGRAM_DOUBLEWORD)
{
/* Program double-word (64-bit) at a specified address */
FLASH_Program_DoubleWord(Address, Data);
prog_bit = FLASH_CR_PG;
}
else if((TypeProgram == FLASH_TYPEPROGRAM_FAST) || (TypeProgram == FLASH_TYPEPROGRAM_FAST_AND_LAST))
{
/* Fast program a 32 row double-word (64-bit) at a specified address */
FLASH_Program_Fast(Address, (uint32_t)Data);

/* If it is the last row, the bit will be cleared at the end of the operation */
if(TypeProgram == FLASH_TYPEPROGRAM_FAST_AND_LAST)
{
prog_bit = FLASH_CR_FSTPG;
}
}
else
{
/* Nothing to do */
}

/* Wait for last operation to be completed */
status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);

/* If the program operation is completed, disable the PG or FSTPG Bit */
if (prog_bit != 0U)
{
CLEAR_BIT(FLASH->CR, prog_bit);
}

/* Flush the caches to be sure of the data consistency */
FLASH_FlushCaches();
}

/* Process Unlocked */
__HAL_UNLOCK(&pFlash);

return status;
}

 

 


HAL_StatusTypeDef FLASH_WaitForLastOperation(uint32_t Timeout)
{
/* Wait for the FLASH operation to complete by polling on BUSY flag to be reset.
Even if the FLASH operation fails, the BUSY flag will be reset and an error
flag will be set */

uint32_t tickstart = HAL_GetTick();
uint32_t error;

while(__HAL_FLASH_GET_FLAG(FLASH_FLAG_BSY))
{
if(Timeout != HAL_MAX_DELAY)
{
if((HAL_GetTick() - tickstart) >= Timeout)
{
return HAL_TIMEOUT;
}
}
}

error = (FLASH->SR & FLASH_FLAG_SR_ERRORS);

if(error != 0u)
{
/*Save the error code*/
pFlash.ErrorCode |= error;

/* Clear error programming flags */
__HAL_FLASH_CLEAR_FLAG(error);

return HAL_ERROR;
}

/* Check FLASH End of Operation flag */
if (__HAL_FLASH_GET_FLAG(FLASH_FLAG_EOP))
{
/* Clear FLASH End of Operation pending bit */
__HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP);
}

/* If there is an error flag set */
return HAL_OK;
}

here i have provided the function also, where i am facing an error.

could please help me to resolve this issue.

can you please provide any reference to work with microcontroller which we are working.

Thank you.

 

29 REPLIES 29
Issamos
Lead II

Hello @yashaswini 

You can find some help taking a look to this post .

Best regards

II

 

TDK
Guru

You must write 64 bits at a time at addresses that are 64-bit aligned.

TDK_0-1693659653888.png

 

If you feel a post has answered your question, please click "Accept as Solution".

Hello,@lssamos

Thank you for your respose and information that you have provided.

hello ,

while try to write at that time ,i am facing that error.The code which i mentioned in my post has HAL_FLASH_Program[ Program double word or fast program of a row at a specified address]. in that facing an issue,

 /* Wait for last operation to be completed */
status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);

Thank you.

hello, as i mentioned to above scenario, i have made some changes in .ld file , could you please check this Screenshot (10).png

Shrink the FLASH section (LENGTH= 0xFF000), the EEPROM_EMU is in the middle of it currently

Tips, buy me a coffee, or three.. PayPal Venmo Up vote any posts that you find helpful, it shows what's working..

hello,

I have tried this shrink the FLASH but still facing same issue.

Thank you

hello,

could please any reference work with EEPROM emulation on my controller.

Thank you

yashaswini
Associate II

Hello STMicroelectronics community,

Can i get another reference check with this, EEPROM emulation on STM32L4R5ZI-P.

Could you please provide guidance or assistance in resolving this issue?