mirror of
https://github.com/G2-Games/cross-usb.git
synced 2025-04-19 13:22:53 -05:00
68 lines
2.8 KiB
Markdown
68 lines
2.8 KiB
Markdown
# Cross USB
|
|
[](https://lib.rs/crates/cross_usb)
|
|
[](https://docs.rs/cross_usb/)
|
|
|
|
A USB library which works seamlessly across most native and WASM targets.
|
|
|
|
------------------
|
|
|
|
> [!NOTE]
|
|
> Web USB only works in Chromium based browsers for now.
|
|
|
|
> [!NOTE]
|
|
> Web USB has certain interation requirements in browsers, along with requiring
|
|
> a **Secure context**. Please read more about this on the
|
|
> [mdn web docs](https://developer.mozilla.org/en-US/docs/Web/API/WebUSB_API)
|
|
|
|
> [!IMPORTANT]
|
|
> When compiling this crate on a WASM target, you must use either the rustflags
|
|
> `RUSTFLAGS=--cfg=web_sys_unstable_apis` or by passing the argument in a
|
|
> `.cargo/config.toml` file. Read more here: https://rustwasm.github.io/wasm-bindgen/web-sys/unstable-apis.html
|
|
|
|
## Dependencies
|
|
|
|
For native USB, the crate utilizies [nusb](https://github.com/kevinmehall/nusb), a pure rust library similar to the very popular libusb.
|
|
|
|
For WASM, this crate utilizes [web-sys](https://crates.io/crates/web-sys) which gives access to browser API calls, and in this case is used to interact with [WebUSB](https://developer.mozilla.org/en-US/docs/Web/API/WebUSB_API)
|
|
|
|
## Example
|
|
To learn about how USB communciations work, check out [USB in a NutShell](https://www.beyondlogic.org/usbnutshell/usb1.shtml).
|
|
|
|
```rust
|
|
use cross_usb::prelude::*;
|
|
use cross_usb::usb::{Recipient, ControlType, ControlIn};
|
|
use cross_usb::device_filter;
|
|
|
|
// Obtain a device descriptor using a DeviceFilter,
|
|
// in this case with its VendorID and ProductID
|
|
let filters = vec![
|
|
device_filter!{vendor_id: 0x054c, product_id: 0x00c9}
|
|
];
|
|
let dev_descriptor = cross_usb::get_device(filters).await.expect("Failed to find device");
|
|
|
|
// Open the device that the descriptor is describing
|
|
let dev = dev_descriptor.open().await.expect("Failed to open device");
|
|
|
|
// Obtain an interface of the device
|
|
let interface = dev.open_interface(0).await.expect("Failed to open interface");
|
|
|
|
// Send a Control transfer to the device, obtaining
|
|
// the result and storing it in `result`
|
|
let result = interface.control_in(ControlIn {
|
|
control_type: ControlType::Vendor,
|
|
recipient: Recipient::Interface,
|
|
request: 0x01,
|
|
value: 0,
|
|
index: 0,
|
|
length: 4,
|
|
})
|
|
.await
|
|
.expect("Sending control transfer failed");
|
|
```
|
|
Check out the [documentation](https://docs.rs/cross_usb/latest/) as well!
|
|
|
|
## TODO
|
|
|
|
- [ ] Add choice for native backend between `libusb` wrapper and pure rust `nusb`
|
|
- [ ] Allow platform-specific operations if the user requires them
|
|
- [ ] Hot plug support... requires either using `libusb` as an optional backend or for [`nusb` to implement it](https://github.com/kevinmehall/nusb/issues/5)
|