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Write in Flash problem error

Posted on June 13, 2011 at 15:25

  I'm trying to write a half word in the flash memory. Every time the system starts my code  write a half word in flash, but it works

only the first time. In the others times the data is not store(PGERR error), and still the first data recorded until I re-program the chip.

I'm using stm32f103C4, 16K flash.

My code to write in flash:

 &sharpdefine FLASH_PAGE_SIZE    ((uint16_t)0x400)

&sharpdefine BANK1_WRITE_START_ADDR  ((uint32_t)0x08003C00)

&sharpdefine BANK1_WRITE_END_ADDR    ((uint32_t)0x08003FFF)

typedef enum {FAILED = 0, PASSED = !FAILED} TestStatus;

uint32_t EraseCounter, Address;

__IO uint8_t NbrOfPage;

volatile FLASH_Status FLASHStatus;

volatile TestStatus MemoryProgramStatus;

void Grava_data(unsigned int Data){

  FLASHStatus = FLASH_COMPLETE;

  MemoryProgramStatus = PASSED;

  FLASH_UnlockBank1();

  /* Define the number of page to be erased */

  NbrOfPage = (BANK1_WRITE_END_ADDR - BANK1_WRITE_START_ADDR) / FLASH_PAGE_SIZE;

  /* Clear All pending flags */

  FLASH_ClearFlag(FLASH_FLAG_BSY | FLASH_FLAG_EOP|FLASH_FLAG_PGERR |FLASH_FLAG_WRPRTERR);   

  FLASHStatus = FLASH_EraseOptionBytes();

  /* Erase the FLASH pages */

  for(EraseCounter = 0; (EraseCounter < NbrOfPage) && (FLASHStatus == FLASH_COMPLETE); EraseCounter++)

  {

    FLASHStatus = FLASH_ErasePage(BANK1_WRITE_START_ADDR + (FLASH_PAGE_SIZE * EraseCounter));

  }

 

  /* Program Flash Bank1 */

  Address = BANK1_WRITE_START_ADDR;

 

    /* Clear All pending flags */

  FLASH_ClearFlag(FLASH_FLAG_BSY | FLASH_FLAG_EOP|FLASH_FLAG_PGERR |FLASH_FLAG_WRPRTERR);   

  FLASHStatus = FLASH_ProgramHalfWord(Address, Data);

 

}

To read the data from flash:

unsigned int Le_data(void){

  Address = BANK1_WRITE_START_ADDR;

  return (*(__IO uint16_t*) Address);

}

#basic-math-error #write-flash-memory-pgerr-error
2 REPLIES 2
Posted on June 13, 2011 at 15:55

  /* Define the number of page to be erased */

 

  NbrOfPage = (BANK1_WRITE_END_ADDR - BANK1_WRITE_START_ADDR) / FLASH_PAGE_SIZE;

The way you've coded your addresses, NbrOfPage = ZERO, nothing is erased.

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Posted on June 13, 2011 at 16:24

Thanks,

   You Solve the problem, now it's working.

:)