Watchdog in mdot/xdot

[Sergio Valiente]

Hello,
Is there a internal watchdog in mdot/xdot? How is it programmed?
thanks

[Leon Lindenfelser]

Hi Sergio,

There is a watchdog available in the mdot and xdot. The mdot uses an STM32F411RE processor and the xdot uses an STM32L151CC processor. We do not enable the watchdog.

Kind regards,
Leon

[Sergio Valiente]

OK,thanks

[Sean Godinez]

Helpful links:

Watchdog Example:
https://github.com/fboris/STM32Cube_FW_F4/blob/master/Projects/STM324xG_EVAL/Examples/IWDG/IWDG_Example/Src/main.c

STM32F411xC/E Reference Manual:
https://www.st.com/resource/en/reference_manual/dm00119316.pdf

[Mark Ruys]

For the xDot:

IWDG_HandleTypeDef hiwdg;

...

    // Enable watchdog. Clock is 37 KHz, reload is 0xfff, prescaler 256, so we need to
    // reset the watchdog within 0xfff / 37k * 256 seconds = 28 seconds.
    hiwdg.Instance = IWDG;
    hiwdg.Init.Prescaler = IWDG_PRESCALER_256;
    hiwdg.Init.Reload = 0xfff;
    if ( HAL_IWDG_Init(&hiwdg) != HAL_OK ) {
        // Error
    }

Call HAL_IWDG_Refresh(&hiwdg) to reset the watchdog.

Note that this watchdog can’t be disabled and will keep running in sleep mode (stop, not sure about standby).

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