Function IOUSBGetEndpointIntervalEncodedMicroframes 

pub unsafe extern "C-unwind" fn IOUSBGetEndpointIntervalEncodedMicroframes(
    usb_device_speed: u32,
    descriptor: *const IOUSBEndpointDescriptor,
) -> u32

Available on crate features AppleUSBDescriptorParsing and objc2-io-kit only.

Extract the interval of an endpoint descriptor

This method parses an endpoint descriptor and returns the service interval as n in (2^(n-1)) microframes

Parameter usbDeviceSpeed: The operational speed of the device

Parameter descriptor: The EndpointDescriptor to parse

Returns: uint32_t Encoded endpoint interval

Safety

descriptor must be a valid pointer.