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
