Struct WindowWatchdog 

pub struct WindowWatchdog<'d, T: WwdgInstance> { /* private fields */ }

Window watchdog (WWDG) driver.

Once activated via WindowWatchdog::new, the WWDG cannot be stopped without a system reset.

The counter counts from T down to 0x3F (63), triggering a reset when it reaches 0x3F. Petting the watchdog while the counter is still above the window register W (the closed window) also causes an immediate reset.

T_initial ──count down──▶ W ──count down──▶ 0x40 ──▶ 0x3F (RESET)
|◄──── closed window ────►|◄──── open window ────►|

Implementations

impl<'d, T: WwdgInstance> WindowWatchdog<'d, T>

pub fn new(_instance: Peri<'d, T>, timeout_us: u32, window_us: u32) -> Self

Creates and immediately starts the window watchdog.

• timeout_us: total watchdog period in microseconds (counter-to-reset time).
• window_us: closed-window duration in microseconds. During this initial portion of the period, petting the watchdog causes a reset. Pass 0 to disable the window restriction (allow petting at any time within the period). Must be strictly less than timeout_us.

pub fn pet(&mut self)

Pet (reload) the watchdog.

Must be called while the counter has fallen into the open window (counter ≤ W). Calling too early (counter > W) causes an immediate reset.