Enum Speed 

#[repr(u8)]
pub enum Speed {
    Low = 0,
    Full = 1,
    High = 2,
    Wireless = 3,
    SuperSpeed = 4,
    SuperSpeedPlus = 5,
}

USB 设备速度

Variants

Low = 0

Full = 1

High = 2

Wireless = 3

SuperSpeed = 4

SuperSpeedPlus = 5

Implementations

impl Speed

pub fn from_usb2_hub_status(raw: u16) -> Self

从 USB 2.0 Hub wPortStatus 解析速度

根据 USB 2.0 规范（第 11.24.2.7 节）：

• Bit 9 (0x0200): Low Speed
• Bit 10 (0x0400): High Speed
• Bit 11 (0x0800): SuperSpeed (USB 3.0)
• 默认: Full Speed

pub fn from_xhci_portsc(speed_value: u8) -> Self

从 xHCI PORTSC PortSpeed 字段解析速度

根据 xHCI 规范（第 4.19.2 节）：

• 1 = Full Speed
• 2 = Low Speed
• 3 = High Speed
• 4 = SuperSpeed
• 5 = SuperSpeedPlus

pub fn to_xhci_slot_value(&self) -> u8

转换为 xHCI Slot Context 速度值

根据 xHCI 规范（第 6.2.2 节）Slot Context Speed 字段：

• 1 = Full Speed
• 2 = Low Speed
• 3 = High Speed
• 4 = Super Speed

pub fn to_xhci_portsc_value(&self) -> u8

Convert to the raw PORTSC.PortSpeed encoding used by xHCI registers.

Values follow xHCI 4.19.2: 1=FS, 2=LS, 3=HS, 4=SS, 5=SS+.

pub fn requires_tt(&self, hub_speed: Self) -> bool

判断是否需要 Transaction Translator

根据 xHCI 规范：

• LS/FS 设备连接在 HS Hub 上需要 TT

pub fn is_low_or_full_speed(&self) -> bool

判断设备是否为 Low Speed 或 Full Speed

Trait Implementations

impl Clone for Speed

fn clone(&self) -> Speed

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Speed

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

Formats the value using the given formatter.

impl Default for Speed

fn default() -> Speed

Returns the “default value” for a type.

impl From<u8> for Speed

fn from(value: u8) -> Self

Converts to this type from the input type.

impl Hash for Speed

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Speed

fn eq(&self, other: &Speed) -> 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 Speed

impl Eq for Speed

impl StructuralPartialEq for Speed