Enum FeedbackRefresh

#[repr(u8)]
pub enum FeedbackRefresh {
    Period2Frames = 1,
    Period4Frames = 2,
    Period8Frames = 3,
    Period16Frames = 4,
    Period32Frames = 5,
    Period64Frames = 6,
    Period128Frames = 7,
    Period256Frames = 8,
    Period512Frames = 9,
}

Feedback period adjustment bRefresh [UAC 3.7.2.2]

From the specification: “A new Ff value is available every 2^(10 – P) frames with P ranging from 1 to 9. The bRefresh field of the synch standard endpoint descriptor is used to report the exponent (10-P) to the Host.”

This means:

• 512 ms (2^9 frames) to 2 ms (2^1 frames) for USB full-speed
• 64 ms (2^9 microframes) to 0.25 ms (2^1 microframes) for USB high-speed

Variants

Period2Frames = 1

Period4Frames = 2

Period8Frames = 3

Period16Frames = 4

Period32Frames = 5

Period64Frames = 6

Period128Frames = 7

Period256Frames = 8

Period512Frames = 9

Implementations

impl FeedbackRefresh

pub const fn frame_count(&self) -> usize

Gets the number of frames, after which a new feedback frame is returned.

Trait Implementations

impl Clone for FeedbackRefresh

fn clone(&self) -> FeedbackRefresh

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for FeedbackRefresh