At startup, I set the watchdog timer to 8 seconds.
IWDG->KR = IWDG_KEY_ENABLE;
IWDG->KR = IWDG_KEY_WRITE_ACCESS_ENABLE;
IWDG->PR = IWDG_PRESCALER_64; // 8 s
IWDG->KR = IWDG_KEY_WRITE_ACCESS_DISABLE;
Further, in the interrupt, when the button is pressed, I want to reconfigure for a shorter duration and reset the processor.
IWDG->KR = IWDG_KEY_WRITE_ACCESS_ENABLE;
IWDG->PR = IWDG_PRESCALER_32;
IWDG->RLR = 429;
while(IWDG->SR){};
IWDG->KR = IWDG_KEY_RELOAD;
while(true){}
Everything works, but sometimes the reset occurs not after 430 ms, but after 4 seconds. In this case, the desired values are written in the IWDG registers. The connected debugger does not affect the result, the same thing is repeated with and without the connected debugger.
