Enum EnumerationError 

pub enum EnumerationError {
    NotConnected,
    PortNotEnabled,
    MalformedDescriptor,
    OutOfChannels,
    OutOfAddresses,
    TooManyHubs,
    Transfer(TransferError),
}

Available on non-crate feature bcm2712 only.

What went wrong bringing up the bus or the root hub in enumerate. Failures enumerating an individual downstream port are not reported this way — enumerate skips a port that misbehaves and carries on — so this only covers the shared bring-up every device depends on.

Variants

NotConnected

No device is connected on the root port (nothing to enumerate).

PortNotEnabled

The root port didn’t enable after a reset — the root device never came up.

MalformedDescriptor

A descriptor (the root hub’s configuration or class descriptor) was too short to parse.

OutOfChannels

Every host channel was already handed out, so enumeration couldn’t get one to run its control transfers on — see Dwc2Host::alloc_channel.

OutOfAddresses

All 127 USB device addresses are in use, so the device just reset cannot be given one. The devices already found are still reported; the walk stops at the one that didn’t fit.

TooManyHubs

More hubs are on the bus than a Bus can track (see MAX_HUBS). Reported rather than passed over, because the topology a Bus keeps is what every device’s split target is derived from: an untracked hub means devices below it would be addressed through the wrong transaction translator, which is a worse answer than stopping.

Transfer(TransferError)

An underlying control transfer failed.

Trait Implementations

impl Clone for EnumerationError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for EnumerationError

impl Debug for EnumerationError

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

Formats the value using the given formatter.

impl Eq for EnumerationError

impl From<TransferError> for EnumerationError

fn from(error: TransferError) -> Self

Converts to this type from the input type.

impl PartialEq for EnumerationError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for EnumerationError