HardFault when i try to program in the Flash memory

[malarab]

Hello,

I need to write data in the flash memory but i always have a hard fault !

please check my code if some one can find the Issus !

(i written my own functions because i do not use hal library)

void FLASH_Write_64(uint32_t WriteAddr, uint64_t *data, uint16_t NumToWrite)

{

uint16_t write_index = 0;

//Unlock the Flash to enable the flash control register access

FLASH_IF_Unlock();

//calculate the user Flash area

uint32_t StartPage = FLASH_IF_GetPage(WriteAddr);

uint32_t EndPageAdress = WriteAddr + NumToWrite*8;

uint32_t EndPage = FLASH_IF_GetPage(EndPageAdress);

//Erase the user Flash area

FLASH_IF_Erase(StartPage, (EndPage - StartPage +1));

//Program the user Flash area word by word

while(write_index < NumToWrite)

{

FLASH_IF_Program(WriteAddr, data[write_index]);

WriteAddr += 8;

write_index++;

}

//Lock the Flash to disable the flash control register access (recommended

//to protect the FLASH memory against possible unwanted operation)

FLASH_IF_Lock();

}

void FLASH_IF_Erase(uint32_t FirstPage, uint32_t NbrOfPage)

{

uint32_t index;

//Verify that next operation can be proceed

FLASH_IF_WaitForLastOperation();

  for (index = FirstPage; index < (FirstPage + NbrOfPage); index++)

  {

   //Start erase page

   FLASH_IF_PageErase(index);

   //Wait for last operation to be completed

   FLASH_IF_WaitForLastOperation();

  }

}

static void FLASH_IF_PageErase(uint32_t Page)

{

//Proceed to erase the page

#ifdef CORE_CM0PLUS

MODIFY_REG(FLASH->C2CR, FLASH_CR_PNB, ((Page << FLASH_CR_PNB_Pos) | FLASH_CR_PER | FLASH_CR_STRT));

#else

MODIFY_REG(FLASH->CR, FLASH_CR_PNB, ((Page << FLASH_CR_PNB_Pos) | FLASH_CR_PER | FLASH_CR_STRT));

#endif

}

void FLASH_IF_Program(uint32_t Address, uint64_t Data)

{

//Verify that next operation can be proceed

FLASH_IF_WaitForLastOperation();

  //Program double-word (64-bit) at a specified address

FLASH_IF_Program_DoubleWord(Address, Data);

//Wait for last operation to be completed

FLASH_IF_WaitForLastOperation();

  //If the program operation is completed, disable the PG or FSTPG Bit

#ifdef CORE_CM0PLUS

  CLEAR_BIT(FLASH->C2CR, FLASH_CR_PG);

#else

  CLEAR_BIT(FLASH->CR, FLASH_CR_PG);

#endif

}

static void FLASH_IF_Program_DoubleWord(uint32_t Address, uint64_t Data)

{

#ifdef CORE_CM0PLUS

//Set PG bit

SET_BIT(FLASH->C2CR, FLASH_CR_PG);

#else

//Set PG bit

SET_BIT(FLASH->CR, FLASH_CR_PG);

#endif

//Program first word

*(uint32_t *)Address = (uint32_t)Data;

__ISB();

//Program second word

*(uint32_t *)(Address + 4U) = (uint32_t)(Data >> 32U);

}

[Javier1]

Are you 100% sre youre erasing correctly the Flash pages before writting in them?

This is how i do it: ( even if i use HAL, you could just ctrl+click your way into HAL and look what baremetally things is doing)

//dump a RAM buffer to flash memory (already erased)
 
   HAL_FLASH_Unlock();
 
 
         HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD((uint64_t*)rxBufferUSB64K+receivedbytesUSB/8), *(uint64_t*)(usbChunkRAMbuffer+i*8));
 
         receivedbytesUSB+=8;
 
      CLEAR_BIT (FLASH->CR, (FLASH_CR_PG));
 
      HAL_FLASH_Lock();

[Javier1 · Accepted solution]

this is how i erase 32KB of Flash pointed by rxBufferUSB64K

void cleanRxbuffer(){
	uint32_t size=32*0x800;//32x2KB pages
		//resetea memoria patterns
		for (uint32_t i = 0; i < size / 0x800; ++i) {
			HAL_FLASH_Unlock();
			FLASH_PageErase(rxBufferUSB64K + i * 0x800); //0x800==2048
			CLEAR_BIT(FLASH->CR, (FLASH_CR_PER));
			HAL_FLASH_Lock();
		}
 
}

[malarab]

It was resolving my problem 😊

In erase function, I have not clear FLASH_CR_PER

Now after clearing it, I can program the flash memory correctly

the hard fault was not generated by the writing function but by the reading function ... i have resolved it