Posted on February 02, 2014 at 18:20 I have read the ST Flash programming manual and looked at the ST examples. I am using STM32F103VC.
I wrote some code to initialize and write/read from flash memory. This is just a test, but I end up in the hard fault handler so I must be accessing an invalid memory location or something.
When debugging I can see that the flash is written in memory. So I think it might be the read function causing this?
flash.c: #define FLASH_PAGE_SIZE ((uint16_t) 0x800)
#define BANK1_WRITE_START_ADDR ((uint32_t) 0x08008000)
#define PAGES_TO_ERASE 2
static FLASH_Status flashStatus;
static uint32_t currentAddress = BANK1_WRITE_START_ADDR + 4;
bool_t Flash_Initialize(void)
{
uint8_t i;
//Unlock flash bank 1.
FLASH_UnlockBank1();
//Clear pending flags.
FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_PGERR | FLASH_FLAG_WRPRTERR);
for(i = 0; i < PAGES_TO_ERASE; i++)
{
flashStatus = FLASH_ErasePage(BANK1_WRITE_START_ADDR + (FLASH_PAGE_SIZE * i));
if(flashStatus != FLASH_COMPLETE)
{
// FLASH_LockBank1();
return FALSE;
}
}
// FLASH_LockBank1();
return TRUE;
}
bool_t Flash_Write(uint32_t data)
{
// FLASH_UnlockBank1();
flashStatus = FLASH_ProgramWord(currentAddress, data);
// FLASH_LockBank1();
currentAddress += 4;
if(flashStatus != FLASH_COMPLETE) return FALSE;
if(Flash_Read( (currentAddress - 4) ) != data) return FALSE;
return TRUE;
}
uint32_t Flash_Read(uint32_t address)
{
return (*(volatile uint32_t*) address);
}
main.c: status = Flash_Initialize();
if(status)
{
DEBUG(''Flash initialize OK'');
}
else
{
DEBUG(''Flash initialize FAILED'');
}
status = Flash_Write(0xAAAAAAAA);
if(status)
{
data = Flash_Read(0x08008000);
DEBUG(''Flash write and read back OK: %u\n'', data);
}
else
{
data = Flash_Read(0x08008000);
DEBUG(''Flash write and read back FAILED: %u\n'', data);
}
