Skip to main content
S
snehakarthik
Associate
September 30, 2024
Question

STM8L052R8 Watchdog Timer Issue

  • September 30, 2024
  • 1 reply
  • 910 views

I have configured the watchdog for the maximum duration possible, i.e, 1.7 sec. 

void watchdog_init(void)
{
CLK_ICKCR |= CLK_ICKR_LSION;
IWDG_KR = 0x55; 
IWDG_PR = 6; 
IWDG_RLR = 0xFF;
IWDG_KR = 0xCC; 
}

But it seems to be resetting in around 26 - 28 ms. I have also checked this timing with an oscilloscope by toggling a led. 

watchdog_init();
do {
LED5_TOGGLE();
printf("Test!\n");
delay(516);
} while(1);
  
What do you think is the cause for this issue? How is it possible to fix this? 

    1 reply

    AA1
    AA1
    Senior III
    September 30, 2024

    As explained in RM, the first step must be enable the watchdog. As is, the watchdog is using the reset values.

    Use this code:

    void watchdog_init(void)
{
CLK_ICKCR |= CLK_ICKR_LSION;
IWDG_KR = 0xCC; // enable
IWDG_KR = 0x55; // write access
IWDG_PR = 6;
IWDG_RLR = 0xFF;
IWDG_KR = 0xAA; // refresh
}

    ,

    Terms & ConditionsAccessibility statement