multi-language STRING Desc support

CHANGELOG.md

@@ -12,12 +12,16 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 * Ability to select USB revision ([#116](https://github.com/rust-embedded-community/usb-device/pull/116)).
 * Added support for alternate settings on interfaces ([#114](https://github.com/rust-embedded-community/usb-device/pull/114)).
 * Added support for architectures without atomics ([#115](https://github.com/rust-embedded-community/usb-device/pull/115)).
+* Added support for multi-language STRING desc ([#122](https://github.com/rust-embedded-community/usb-device/pull/122)).
+  * `UsbDeviceBuilder` has a public `.extra_lang_ids()` method to specify LANGIDs besides ENGLISH_US(0x0409)
 
 ### Breaking
 * `DescriptorWriter::iad()` now requires a `Option<StringIndex>` to optionally specify a string for describing the function ([#121](https://github.com/rust-embedded-community/usb-device/pull/121))
+* `.manufacturer()`, `.product()` and `.serial_number()` of `UsbDeviceBuilder` now require `&[&str]` to specify strings match with each LANGIDs supported by device. ([#122](https://github.com/rust-embedded-community/usb-device/pull/122))
 
 ### Changed
 * `EndpointType` enum now has fields for isochronous synchronization and usage ([#60](https://github.com/rust-embedded-community/usb-device/pull/60)).
+* `descriptor_type::STRING` of `fn get_descriptor()` will send the LANGIDs supported by device, and respond STRING Request with specified LANGID. ([#122](https://github.com/rust-embedded-community/usb-device/pull/122))
 
 ## [0.2.9] - 2022-08-02
 

src/class.rs

@@ -1,6 +1,7 @@
 use crate::bus::{InterfaceNumber, StringIndex, UsbBus};
 use crate::control;
 use crate::control_pipe::ControlPipe;
+use crate::descriptor::lang_id::LangID;
 use crate::descriptor::{BosWriter, DescriptorWriter};
 use crate::endpoint::EndpointAddress;
 use crate::{Result, UsbError};
@@ -43,7 +44,7 @@ pub trait UsbClass<B: UsbBus> {
     /// * `index` - A string index allocated earlier with
     ///   [`UsbAllocator`](crate::bus::UsbBusAllocator).
     /// * `lang_id` - The language ID for the string to retrieve.
-    fn get_string(&self, index: StringIndex, lang_id: u16) -> Option<&str> {
+    fn get_string(&self, index: StringIndex, lang_id: LangID) -> Option<&str> {
         let _ = (index, lang_id);
         None
     }

src/descriptor.rs

@@ -19,12 +19,7 @@ pub mod descriptor_type {
 }
 
 /// String descriptor language IDs.
-pub mod lang_id {
-    /// English (US)
-    ///
-    /// Recommended for use as the first language ID for compatibility.
-    pub const ENGLISH_US: u16 = 0x0409;
-}
+pub mod lang_id;
 
 /// Standard capability descriptor types
 #[allow(missing_docs)]