STM32G0 - IWDG

[pierre-yves]

205 / 5000

Hello

I want to use the IWDG component.

I activated the module with HAL_IWDG_MODULE_ENABLED and configure the clocks (LSI):

	RCC_OscInitStruct.OscillatorType 	= RCC_OSCILLATORTYPE_LSI|RCC_OSCILLATORTYPE_HSE;
	RCC_OscInitStruct.HSEState 			= RCC_HSE_ON;
	RCC_OscInitStruct.LSIState 			= RCC_LSI_ON;
	RCC_OscInitStruct.PLL.PLLState 		= RCC_PLL_ON;
	RCC_OscInitStruct.PLL.PLLSource 	= RCC_PLLSOURCE_HSE;
	RCC_OscInitStruct.PLL.PLLM 			= RCC_PLLM_DIV4;
	RCC_OscInitStruct.PLL.PLLN 			= 70;
	RCC_OscInitStruct.PLL.PLLP 			= RCC_PLLP_DIV10;
	RCC_OscInitStruct.PLL.PLLR 			= RCC_PLLR_DIV5;
	if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
	{
		Error_Handler();
	}

Here is my source code to initialize the watchdog:

IWDG_HandleTypeDef hiwdg;
 
hiwdg.Instance 			= IWDG;
hiwdg.Init.Prescaler 	= IWDG_PRESCALER_32;
hiwdg.Init.Window 		= IWDG_WINDOW;
hiwdg.Init.Reload 		= IWDG_RELOAD;
if (HAL_IWDG_Init(&hiwdg) != HAL_OK)
{
	Error_Handler();
}

with :

#define IWDG_WINDOW IWDG_WINDOW_DISABLE
#define IWDG_RELOAD 1500

When the HAL_IWDG_Init function is executed, the microcontroller arrives in HardFault_Handler

The following operation goes wrong: IWDG_ENABLE_WRITE_ACCESS (hiwdg);

Do you have any ideas ?

Thank you in advance.

[Imen.D]

Hello @pierre-yves​ ,

Which STM32CubeG0 MCU package are you using?

Please make sure to use the latest release of CubeG0 package as contains a fix in HAL_IWDG_DEFAULT_TIMEOUT define related to IWDG start-up timeout insufficiently low issue.

Imen

[pierre-yves]

Hello

To test, I modified the define:

#define HAL_IWDG_DEFAULT_TIMEOUT 2000

it is indeed the macro IWDG_ENABLE_WRITE_ACCESS (hiwdg) which generates an error (HardFault_Handler).

I also changed the values

hiwdg.Instance = IWDG;

hiwdg.Init.Prescaler = IWDG_PRESCALER_128;

hiwdg.Init.Window = IWDG_WINDOW;

hiwdg.Init.Reload = 4095;

Not easy .... any ideas? .. I block

Thnak you

[pierre-yves]

In fact it is indeed a timeout error made by the HAL_IWDG_Init function. But I don't know what to do.

I am in version 1.3.0 at the HAL software

[Imen.D]

Hi @pierre-yves​ ,

I advise you use the latest release of STM32CubeG0 MCU package (version 1.4.0) as contains a fix in IWDG driver.

Then, please keep me updated on your progress on this issue.

Imen

[pierre-yves]

Hello

Thank you for your comeback.

I updated the HAL layers to version 1.4.0.

I have the same problem.

it is this operation that goes wrong: IWDG_ENABLE_WRITE_ACCESS (hiwdg); i.e. hiwdg-> Instance-> KR = IWDG_KEY_WRITE_ACCESS_ENABLE,

Can you help me ?

[pierre-yves · Accepted solution]

Hello

I found, certainly related to updating the HAL layers and the configuration of the watchdog IWDG.

it works with:

hiwdg.Init.Prescaler = IWDG_PRESCALER_32;
hiwdg.Init.Window = IWDG_WINDOW;
hiwdg.Init.Reload = 1000;

it does not work with:

hiwdg.Init.Prescaler = IWDG_PRESCALER_4;
hiwdg.Init.Window = IWDG_WINDOW;
hiwdg.Init.Reload = 259;

For infomormation

#define IWDG_WINDOW IWDG_WINDOW_DISABLE

I wished to have a watchdog at 500ms. i

In the good configuration , it is 1s .