Struct PanicSlot 

pub struct PanicSlot<'a> { /* private fields */ }

Framing wrapper around a borrowed RAM region.

One instance is constructed at boot from the BSP-provided &'static mut [u8]. Pass the same region (the literal same RAM, not a fresh copy) every reset so the previous boot’s panic can be recovered.

Implementations

impl<'a> PanicSlot<'a>

pub fn new(region: &'a mut [u8]) -> PanicSlot<'a>

Wrap a RAM region. Region must be at least [HEADER_LEN] + 1 byte; smaller regions panic in debug and silently truncate writes to zero payload bytes in release.

pub fn payload_capacity(&self) -> usize

Capacity available for payload bytes.

pub fn capture(&mut self, msg: &[u8]) -> usize

Write a panic message. Truncates if msg is larger than the payload capacity. Returns the number of payload bytes actually stored. Designed to be callable from a panic handler, so it allocates nothing and uses only direct slice writes.

pub fn read(&self) -> Option<&[u8]>

Borrow the previously-captured payload, if a valid record is present. Returns None for an uninitialized region, a stale / foreign record (wrong magic), a corrupt record (bad checksum), or an out-of-bounds length.

pub fn clear(&mut self)

Invalidate the record. Subsequent read calls return None until another capture writes a new one. Cheap: zeroes only the 4-byte magic.

Trait Implementations

impl<'a> Debug for PanicSlot<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.