STM32H743 IWDG Standby
Hi,
I have been banging my head for a while now and decided to reach out for help. I am trying to get the IWDG to freeze during Standby. Based off the reference manual I have toggled the IWDG_FZ_SDBY bit to 0. In STM32CubeProgrammer it is set to 0 so theoretically it should Stop the IWDG while in Standby. But the board keeps resetting, I decided to test this out on the NUCLEO-H743ZI2, same thing is happening and the code is extremely simple.
HAL_Init();
SystemClock_Config();
FLASH_OBProgramInitTypeDef OBInit;
HAL_FLASHEx_OBGetConfig(&OBInit);
if(OBInit.USERConfig & OB_IWDG_STDBY_ACTIVE)
{
// Unlock flash option bytes
HAL_FLASH_Unlock();
HAL_FLASH_OB_Unlock();
OBInit.OptionType = OPTIONBYTE_USER;
OBInit.USERConfig = OB_IWDG_STDBY_FREEZE;
OBInit.USERType = OB_USER_IWDG_STDBY;
HAL_FLASHEx_OBProgram(&OBInit);
HAL_FLASH_OB_Launch();
}
MX_GPIO_Init();
MX_ETH_Init();
MX_USART3_UART_Init();
MX_USB_OTG_FS_PCD_Init();
MX_IWDG1_Init();
HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, SET);
int i =0;
while (1)
{
HAL_Delay(300);
HAL_GPIO_TogglePin(LD3_GPIO_Port, LD3_Pin);
i++;
if(i>=10)
HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, RESET);
if(i>=30)
{
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
HAL_PWR_EnterSTANDBYMode();
}
HAL_IWDG_Refresh(&hiwdg1);
}I also tried the same thing on the NUCLEO-L432KC and this time it is working. I have looked online to see if people had a similar problem and cannot seem to find anything about this.
Anyone can help?
I will be implementing a quick solution in the meanwhile that includes writing to the flash before going in Standby and reading that flash at boot. I would prefer not use this in the final product though.
Thanks