Struct WwdgtRunning 

pub struct WwdgtRunning { /* private fields */ }

The watchdog once it is counting down.

No way out: WDGTEN ignores a written zero and only a hardware reset clears it, so neither the peripheral nor the period comes back.

Implementations

impl WwdgtRunning

pub fn feed(&mut self)

Reloads the counter, which must happen inside the window: too early resets the chip exactly as too late does.

pub fn set_period(&mut self, cnt: u8, win: u8)

Changes the period and the window, taking effect at the next feed.

The new window applies at once, so the next feed is already judged by it.

Panics

On the same three conditions as Wwdgt::start.

pub fn listen(&mut self)

Lets the counter reaching 0x40 raise an interrupt — one tick before the reset, the last moment anything can still run.

Irreversible, like the watchdog itself: EWIE ignores a written zero, so there is no unlisten. Unmasking the line in the NVIC is the caller’s.

pub fn is_listening(&self) -> bool

Whether the early wakeup interrupt is enabled.

pub fn is_pending(&self) -> bool

Whether the counter has reached 0x40.

Hardware sets the flag whether or not listen was called, so this doubles as a plain poll for “one tick left”.

pub fn clear_interrupt(&mut self)

Clears the flag, which a handler must do before returning — the flag is the request, and hardware never drops it.

The flag rises again for as long as the counter sits at 0x40, so a handler that only clears it is entered over and over until the reset. For exactly one entry, mask the line in the NVIC inside the handler.