WWDG

[lucas23]

Posted on July 17, 2015 at 16:18

Hi,

I am having problems to run the WWDG in a STM32F405.I am using the HAL Drivers from Cube MX.The process is the following:{__HAL_RCC_WWDG_CLK_ENABLE();MX_WWDG_Init();HAL_WWDG_Start(&hwwdg);HAL_WWDG_Refresh(&hwwdg,127);}Where:void MX_WWDG_Init(void){  hwwdg.Instance = WWDG;  hwwdg.Init.Prescaler = WWDG_PRESCALER_1;  hwwdg.Init.Window = 80;  hwwdg.Init.Counter = 127;  HAL_WWDG_Init(&hwwdg);}The problem is that the program never reaches the refresh function. It resets the micro in the line showed below:HAL_StatusTypeDef HAL_WWDG_Start(WWDG_HandleTypeDef *hwwdg){  /* Process Locked */  __HAL_LOCK(hwwdg);     /* Change WWDG peripheral state */    hwwdg->State = HAL_WWDG_STATE_BUSY;  /* Enable the peripheral */  __HAL_WWDG_ENABLE(hwwdg);  // THE MICRO RESETS AFTER CALLING THAT FUNCTION!    /* Change WWDG peripheral state */      hwwdg->State = HAL_WWDG_STATE_READY;     /* Process Unlocked */  __HAL_UNLOCK(hwwdg);    /* Return function status */  return HAL_OK;}Any clues? #stm32f1-wwdg-iwdg

[nesrine]

Posted on July 17, 2015 at 18:46

Hi,

I suggest you to start from one example of WWDG from the STM32cubeF4 package-Syrine-

[jpeacock]

Posted on July 17, 2015 at 19:19

Before you enable the WWDG you have to make sure the timer is inside the window.  Enabling WWDG if the counter is outside the window forces a reset.

I poll WWDG->CR register until it is well above the min threshold, about half way in the window, before turning it on.  I don't use the HAL so no idea if there's any support for making sure the WWDG is in a good place before enabling.   Jack Peacock

[lucas23]

Posted on July 20, 2015 at 21:14

The Cube example is presented below. The code is basicly the same as mine. Still not working!

/*##-2- Configure the WWDG peripheral ######################################*/  /* WWDG clock counter = (PCLK1 (42MHz)/4096)/8) = 1281 Hz (~780 us)      WWDG Window value = 80 means that the WWDG counter should be refreshed only      when the counter is below 80 (and greater than 64) otherwise a reset will      be generated.      WWDG Counter value = 127, WWDG timeout = ~780 us * 64 = 49.9 ms */  WwdgHandle.Instance = WWDG;  WwdgHandle.Init.Prescaler = WWDG_PRESCALER_8;  WwdgHandle.Init.Window    = 80;  WwdgHandle.Init.Counter   = 127;  if(HAL_WWDG_Init(&WwdgHandle) != HAL_OK)  {    /* Initialization Error */    Error_Handler();  }    /*##-5- Start the WWDG #####################################################*/   if(HAL_WWDG_Start(&WwdgHandle) != HAL_OK)  {    Error_Handler();  }    /* Infinite loop */   while (1)  {    /* Toggle LED2 */    BSP_LED_Toggle(LED2);        /* Insert 40 ms delay */    HAL_Delay(40);        /* Refresh WWDG: update counter value to 127, the refresh window is:     ~780 * (127-80) = 36.6ms < refresh window < ~780 * 64 = 49.9ms */          if(HAL_WWDG_Refresh(&WwdgHandle, 127) != HAL_OK)    {      Error_Handler();    }  }

[Vprabhu]

Posted on November 20, 2015 at 11:08Hi All,Here is my code for WWDG in STM32F429void BSP::WATCHDOG_Intialization (void) { HAL_WWDG_DeInit(&Watchdog); __WWDG_CLK_ENABLE();             //Enable WAtch dog timer clock   __HAL_FREEZE_WWDG_DBGMCU();    //Stop WWDG during Debugging  Watchdog.Instance=WWDG;     //WWDG clock counter = (PCLK1 (42MHz)/4096)/8) = 1281 Hz (~780 us) PCLK1 = AHB clock/4=168Mhz/4=42MHz  Watchdog.Init.Counter = 127;  Watchdog.Init.Prescaler = WWDG_PRESCALER_8;  Watchdog.Init.Window = 80; HAL_WWDG_Init(&Watchdog);                 //Intialize the Watchdog with configuration } void BSP::WATCHDOG_start(void)                //Starts the Watchdog timer with initial counter value to downcount {  HAL_WWDG_Start(&Watchdog); } void BSP::WATCHDOG_Refresh(void)               //Refreshes the Watchdog timer counter for every to prevent the counter being underflowing {   HAL_GPIO_TogglePin(LED1_PORT, LED1_PIN);  //Just for the purpose of knowing it does refreshment   HAL_WWDG_Refresh(&Watchdog, 127);         //reload the watchdog timer with initial count value }The  BSP::WATCHDOG_Refresh( ) ; function is called in 40 msec loop in some other file.but my problem here is the MCU gets reset even after i do counter refresh in 40 msec loop .the windows threshold is 36.6 msec to 49.9 msec where as i do refresh in 40 msec.but still the problem persists...Could any one help me in this soon?

[baycan]

Posted on August 31, 2016 at 16:26

Hi,

Did you find any solution about this issue with using HAL libs ? Best Regards