Struct embassy_stm32::usb::Config

#[non_exhaustive]
pub struct Config {
    pub vbus_detection: bool,
    pub xcvrdly: bool,
}

USB driver config.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

vbus_detection: bool

Enable VBUS detection.

The USB spec requires USB devices monitor for USB cable plug/unplug and react accordingly. This is done by checking whether there is 5V on the VBUS pin or not.

If your device is bus-powered (powers itself from the USB host via VBUS), then this is optional. (If there’s no power in VBUS your device would be off anyway, so it’s fine to always assume there’s power in VBUS, i.e. the USB cable is always plugged in.)

If your device is self-powered (i.e. it gets power from a source other than the USB cable, and therefore can stay powered through USB cable plug/unplug) then you MUST set this to true.

If you set this to true, you must connect VBUS to PA9 for FS, PB13 for HS, possibly with a voltage divider. See ST application note AN4879 and the reference manual for more details.

xcvrdly: bool

Enable transceiver delay.

Some ULPI PHYs like the Microchip USB334x series require a delay between the ULPI register write that initiates the HS Chirp and the subsequent transmit command, otherwise the HS Chirp does not get executed and the deivce enumerates in FS mode. Some USB Link IP like those in the STM32H7 series support adding this delay to work with the affected PHYs.

Trait Implementations

impl Clone for Config

fn clone(&self) -> Config

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Config

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

Formats the value using the given formatter.

impl Default for Config

fn default() -> Config

Returns the “default value” for a type.

impl PartialEq for Config

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

impl Eq for Config

impl StructuralPartialEq for Config