Enum CardPresence 

#[non_exhaustive]
pub enum CardPresence {
    Detect,
    ForceAbsent,
}

Whether the SD slot should behave as populated or be forced to degrade.

ForceAbsent is a general force-degrade capability, not a HIL word: it makes the card device behave as an empty slot (chip-select never asserts), so the app’s real SdSpi::init() runs and fails authentically — reaching the same graceful-degrade path as a physically empty slot, with a card inserted. Any HIL arming (an RTC one-shot, a :nosd verb) stays consumer-side; nothing HIL leaks into this surface.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Detect

Drive the chip-select normally: a real card initialises; an empty slot degrades on its own.

ForceAbsent

Freeze the chip-select deasserted so the card is never selected — SdSpi::init() then fails exactly like an empty slot.

Trait Implementations

impl Clone for CardPresence

fn clone(&self) -> CardPresence

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CardPresence

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

Formats the value using the given formatter.

impl PartialEq for CardPresence

fn eq(&self, other: &CardPresence) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for CardPresence

impl Eq for CardPresence

impl StructuralPartialEq for CardPresence