WWDG_IRQHandler Doesn't Seem To Be Reached

[vindicator]

I started learning about it while playing with WWDG_Example from STM32446E_EVAL.

I can enable WWDG and tie it to my EXTI button on my Discovery board.

The board will reset when the button is pressed and __HAL_RCC_GET_FLAG(RCC_FLAG_WWDGRST) == RESET.

What I have NOT been able to do is preempt the reset even though I also set WwdgHandle.Init.EWIMode = WWDG_EWI_ENABLE;

I added

void WWDG_IRQHandler(void)

{

HAL_WWDG_IRQHandler(&WwdgHandle);

}

to my stm32f4xx_it.c file and set breaks at various locations, but the handler never seems to be reached, but rather it goes straight to Reset_Handler:

I'm using the HAL in v1.24.

[Jack Peacock_2]

If the WWDG counter is already below the reset threshold when enabled you won't get the early warning interrupt. Make sure the count is above 0x40 before enabling WWDG.

Jack Peacock

[vindicator]

I've been thinking about what you said and it's not registering for me...

When the MCU is started, the HAL is initialized, then the SystemClock is configured.

THEN I initialize the WDG.

If I set WwdgHandle.Init.Counter = 127; which is above 64, that should be fine. ("This parameter must be a number between Min_Data = 0x40 and Max_Data = 0x7F ").

If It was BEYOND either range, assert_param(IS_WWDG_COUNTER(hwwdg->Init.Counter)); would throw I would think.

Even if it didn't throw and was beyond that range, I'd think the MCU would reset immediately. In other words, I never get a chance to blink any LED or press the EXTI0 button.

Am I wrong in my thinking?

Let's assume you are correct in your assumption and that I didn't set my counter in the range, where could I get the downcount value from the WWDG in progress?

EDIT0:

Ugh, I didn't hit "reply" to Jack Peacock_2.

But I figured out the cause, which appears to be the HAL never enables the WDG_IRQn.

I find it odd that void BSP_PB_Init makes a call to HAL_NVIC_EnableIRQ, but HAL_WWDG_Init does not. Bug?

[vindicator]

Now I'm stuck at if (__HAL_WWDG_GET_IT_SOURCE(hwwdg, WWDG_IT_EWI) != RESET) called from

void WWDG_IRQHandler(void)
{
  // HAL_WWDG_Refresh(&WwdgHandle);
  __HAL_RCC_CLEAR_RESET_FLAGS();
  __HAL_RCC_WWDG_CLK_DISABLE();
  // __HAL_DBGMCU_FREEZE_WWDG();
  HAL_WWDG_IRQHandler(&WwdgHandle);
}

You can see I'm trying a bunch of things to get the WDG to stop while I'm stepping through, but the stack keeps looping through:

HAL_WWDG_IRQHandler(WWDG_HandleTypeDef * hwwdg) STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_wwdg.c:356) //__HAL_WWDG_GET_IT_SOURCE where I'm stuck and it never progresses down to HAL_WWDG_EarlyWakeupCallback.
<signal handler called> (Unknown Source:0) //don't know
HAL_GetTick() STM32F4xx_HAL_Driver/Src/stm32f4xx_hal.c:325) //from the next main.c loop cycle
<function called from gdb> (Unknown Source:0) //don't know
HAL_Delay(uint32_t Delay) STM32F4xx_HAL_Driver/Src/stm32f4xx_hal.c:390) //that call from my EXTI callback method.
HAL_GPIO_EXTI_IRQHandler(uint16_t GPIO_Pin) STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_gpio.c:500 //called my HAL_GPIO_EXTI_Callback where I call HAL_Delay to trip the WDG.
<signal handler called> (Unknown Source:0) //don't know
HAL_GetTick() STM32F4xx_HAL_Driver/Src/stm32f4xx_hal.c:325 //called from the main loop for that time range.
main() main.c:102 //the while loop where HAL_WWDG_Refresh gets called when in the time range.