EUsb

The eusb crate provides easy way to communicate usb, with async fn.

example

Test with device hackrf one.

```rust use rusb::prelude::*;

[tokio::main]

async fn main(){ let manager = UsbManager::new().unwrap(); let mut device = manager.opendevicewithvidpid(0x1d50, 0x6089).unwrap(); println!("sn: {}", device.serialnumber()); let devicedescriptor = device.descriptor(); println!("{:?}", devicedescriptor); let configs = device.configlist().unwrap(); for config in configs { println!("{}", config); } let mut request = ControlTransferRequest::default(); request.recipient = UsbControlRecipient::Device; request.transfer_type = UsbControlTransferType::Vendor; request.request = 15;

let start = Instant::now();

let data = device.control_transfer_in(
    request,
    30,
).await.unwrap();
let duration = start.elapsed();

let version = String::from_utf8(data).unwrap();

println!("version: {} cost: {:?}", version, duration);

let interface = device.get_interface(0).unwrap();

let mut all = 0usize;
let start = Instant::now();
for _ in 0..1000 {
    let data = interface.bulk_transfer_in(BulkTransferRequest{
        endpoint: 1,
        package_len: 262144,
        timeout: Default::default(),
    }).await.unwrap();
    all += data.len();
}
let duration = Instant::now().duration_since(start);
let bits = (all) as f64;
let seconds = duration.as_secs_f64();
let mb = (bits / seconds) / 1_000_000.0;

println!("speed：{} MB/s", mb);

}

```