Posted on May 15, 2017 at 12:47Hi,
I am having a problem writing to flash with the IWDG enabled, presumably I am missing something.
I have cut my project down to a minimum that reproduces the problem.
The program initialises the HAL and system clocks and then erases a flash sector (FLASH_SECTOR_2), the compiler is told not to use sector 2 & 3 so I can store parameters in them.
This gives me a successful return value and all is well.
However if I enable IWDG (HAL_IWDG_Start()), then HAL_FLASHEx_Erase() fails with HAL_FLASH_GetError() = 6.
I've changed the watchdog to a long period to make sure its not interrupting the erase.
Have I skipped over some detail? I had assumed that the watchdog being independent all I needed to do was ensure the watch period was long enough not to interrupt the flash writing.
void MX_IWDG_Init(void)
{
hiwdg.Instance = IWDG;
hiwdg.Init.Prescaler = IWDG_PRESCALER_256;
hiwdg.Init.Reload = 4095;
HAL_IWDG_Init(&hiwdg);
}
HAL_Init();
SystemClock_Config();
HAL_IWDG_Start(&hiwdg); /* Start Watchdog */
HAL_FLASH_Unlock(); /* makes no difference */
uint32_t error_sector_num = 0;
FLASH_EraseInitTypeDef EraseInitStruct;
EraseInitStruct.TypeErase = FLASH_TYPEERASE_SECTORS;
EraseInitStruct.VoltageRange = FLASH_VOLTAGE_RANGE_3;
EraseInitStruct.Sector = FLASH_SECTOR_2;
EraseInitStruct.NbSectors = 1u;
/* erase flash */
if(HAL_FLASHEx_Erase(&EraseInitStruct, &error_sector_num) != HAL_OK)
{
/* Error while erasing sectors */
uint32_t error_code = HAL_FLASH_GetError();
__ASM volatile('BKPT #01');
}
else
{
__ASM volatile('BKPT #01');
}
Thanks in advance,
