webusb 0.5.0

WebUSB API implementation in Rust
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69

use webusb::Context;
use webusb::Direction;
use webusb::Result;
use webusb::UsbControlTransferParameters;
use webusb::UsbRecipient;
use webusb::UsbRequestType;

use std::io::Read;
use std::io::Write;

const ARDUINO_CONTROL_INIT: UsbControlTransferParameters =
  UsbControlTransferParameters {
    request_type: UsbRequestType::Class,
    recipient: UsbRecipient::Interface,
    request: 0x22,
    value: 0x01,
    index: 2,
  };

const ARDUINO_CONTROL_BYE: UsbControlTransferParameters =
  UsbControlTransferParameters {
    request_type: UsbRequestType::Class,
    recipient: UsbRecipient::Interface,
    request: 0x22,
    value: 0x00,
    index: 2,
  };

fn main() -> Result<()> {
  let context = Context::init()?;
  let devices = context.devices()?;

  let mut device = devices
    .into_iter()
    .find(|d| d.vendor_id == 0x2341 && d.product_id == 0x8036)
    .expect("Device not found.");
  device.open()?;

  device.claim_interface(2)?;
  device.select_alternate_interface(2, 0)?;

  device
    .control_transfer_out(ARDUINO_CONTROL_INIT, &[])?;

  loop {
    let input: Option<u8> = std::io::stdin()
      .bytes()
      .next()
      .and_then(|result| result.ok());

    match input {
      Some(b'H') => {
        device.transfer_out(4, b"H")?;
        device.clear_halt(Direction::Out, 4)?;
      }
      Some(b'L') => {
        device.transfer_out(4, b"L")?;
        device.clear_halt(Direction::Out, 4)?;
      }
      Some(b'Q') => break,
      _ => {}
    }
  }

  device
    .control_transfer_out(ARDUINO_CONTROL_BYE, &[])?;
  device.close()?;
  Ok(())
}