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Expose watchdog reset reason #939

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Expose watchdog reset reason #939

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20 changes: 20 additions & 0 deletions rp235x-hal/src/watchdog.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,14 @@ pub struct Watchdog {
load_value: u32, // decremented by 2 per tick (µs)
}

/// Watchdog reset reason
pub enum ResetReason {
/// A manual watchdog trigger caused the reset.
Force,
/// A watchdog timeout caused the reset.
Timeout,
}

#[derive(Debug)]
#[allow(missing_docs)]
/// Scratch registers of the watchdog peripheral
Expand Down Expand Up @@ -114,6 +122,18 @@ impl Watchdog {
self.watchdog.ctrl().write(|w| w.enable().bit(bit))
}

/// Get the watchdog reset reason.
pub fn reason(&self) -> Option<ResetReason> {
let bits = self.watchdog.reason().read().bits();
if bits & 0b10 != 0 {
Some(ResetReason::Force)
} else if bits & 0b01 != 0 {
Some(ResetReason::Timeout)
} else {
None
}
}

/// Read a scratch register
pub fn read_scratch(&self, reg: ScratchRegister) -> u32 {
match reg {
Expand Down