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feat(usb): add device qualifier descriptor

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Signed-off-by: Haobo Gu <haobogu@outlook.com>
This commit is contained in:
Haobo Gu 2024-08-15 10:58:10 +08:00
parent 7a26e117cc
commit a63d46507d
2 changed files with 25 additions and 0 deletions
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21
embassy-usb/src/descriptor.rs
View File

@ -13,6 +13,8 @@ pub mod descriptor_type {
pub const STRING: u8 = 3;
pub const INTERFACE: u8 = 4;
pub const ENDPOINT: u8 = 5;
pub const DEVICE_QUALIFIER: u8 = 6;
pub const OTHER_SPEED_CONFIGURATION: u8 = 7;
pub const IAD: u8 = 11;
pub const BOS: u8 = 15;
pub const CAPABILITY: u8 = 16;
@ -272,6 +274,25 @@ pub(crate) fn device_descriptor(config: &Config) -> [u8; 18] {
]
}
/// Create a new Device Qualifier Descriptor array.
///
/// All device qualifier descriptors are always 10 bytes, so there's no need for
/// a variable-length buffer or DescriptorWriter.
pub(crate) fn device_qualifier_descriptor(config: &Config) -> [u8; 10] {
[
10, // bLength
0x06, // bDescriptorType
0x10,
0x02, // bcdUSB 2.1
config.device_class, // bDeviceClass
config.device_sub_class, // bDeviceSubClass
config.device_protocol, // bDeviceProtocol
config.max_packet_size_0, // bMaxPacketSize0
1, // bNumConfigurations
0, // Reserved
]
}
/// A writer for Binary Object Store descriptor.
pub struct BosWriter<'a> {
pub(crate) writer: DescriptorWriter<'a>,

4
embassy-usb/src/lib.rs
View File

@ -190,6 +190,7 @@ struct Inner<'d, D: Driver<'d>> {
config: Config<'d>,
device_descriptor: [u8; 18],
device_qualifier_descriptor: [u8; 10],
config_descriptor: &'d [u8],
bos_descriptor: &'d [u8],
msos_descriptor: crate::msos::MsOsDescriptorSet<'d>,
@ -225,6 +226,7 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
// This prevent further allocation by consuming the driver.
let (bus, control) = driver.start(config.max_packet_size_0 as u16);
let device_descriptor = descriptor::device_descriptor(&config);
let device_qualifier_descriptor = descriptor::device_qualifier_descriptor(&config);
Self {
control_buf,
@ -233,6 +235,7 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
bus,
config,
device_descriptor,
device_qualifier_descriptor,
config_descriptor,
bos_descriptor,
msos_descriptor,
@ -764,6 +767,7 @@ impl<'d, D: Driver<'d>> Inner<'d, D> {
}
}
}
descriptor_type::DEVICE_QUALIFIER => InResponse::Accepted(&self.device_qualifier_descriptor),
_ => InResponse::Rejected,
}
}