STM32 independent watchdog usage experience (Cortex-M3)-EEWORLD

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The calculation formula of the watchdog feeding time (watchdog overflow time) is:

Tout=((4*2^prer)*rlr)/40

Tout is the watchdog overflow time (in ms), prer is the watchdog clock prescaler value (IWDG_PR value), ranging from 0 to 7, and rlr is the watchdog reload value (IWDG_RLR).

void IWDG_Configuration(void)

{

IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable); //Remove register protection

IWDG_SetPrescaler(IWDG_Prescaler_256); //Write the initialization division value 0~7

IWDG_SetReload(0xFFF); //0xfff*256/40k=26s

IWDG_ReloadCounter(); //Enable register protection

IWDG_Enable(); //Start watchdog

}

After initialization, the watchdog starts to count down gradually to 0000 and resets, so the watchdog must be continuously fed before resetting, that is, data must be continuously reloaded into IWDG_RLR to prevent reset.

void IWDG_Feed(void) //dog feeding function

{

IWDG->KR=0XAAAA;

}

Keywords：STM32 Reference address：STM32 independent watchdog usage experience (Cortex-M3)

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