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more work on descriptor building, almost there

Browse Source 
also added the very early beginnings of an example to document how to
get speed
This commit is contained in:
Keenan Tims
2026-04-21 00:45:03 -07:00
parent c27db15fe9
commit ac6618a162
6 changed files with 855 additions and 131 deletions
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examples/lpc55s28/.gitignore
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examples/lpc55s28/Cargo.toml
+9
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@@ -0,0 +1,9 @@
[package]
name = "usbd_uac2_demo"
version = "0.1.0"
edition = "2024"
[dependencies]
lpc55-hal = "0.5.0"
lpc55-pac = "0.5.0"
usbd-uac2 = { version = "0.1.0", path = "../.." }
examples/lpc55s28/src/main.rs
+20
View File
@@ -0,0 +1,20 @@
use lpc55_pac as pac;
use usbd_uac2::{self, UsbSpeed, UsbSpeedProvider};
struct Lpc55UsbSpeedProvider {}
impl UsbSpeedProvider for Lpc55UsbSpeedProvider {
fn speed(&self) -> usbd_uac2::UsbSpeed {
let regs = unsafe { &*pac::USB1::ptr() };
match regs.devcmdstat.read().speed().bits() {
1 => UsbSpeed::Full,
2 => UsbSpeed::High,
3 => UsbSpeed::Super,
_ => panic!("Unknown USB speed"),
}
}
}
fn main() {
println!("Hello, world!");
}
src/descriptors.rs
+112 -9
View File
@@ -975,15 +975,15 @@ pub enum Type1FormatBitmap {
}
pub struct AudioStreamingInterface {
terminal_id: u8,
active_alt_setting: AccessControl,
valid_alt_settings: AccessControl,
pub terminal_id: u8,
pub active_alt_setting: AccessControl,
pub valid_alt_settings: AccessControl,
/// Only type 1 format is supported
format_type: FormatType,
format_bitmap: Type1FormatBitmap,
num_channels: u8,
channel_config: ChannelConfig,
string: Option<StringIndex>,
pub format_type: FormatType,
pub format_bitmap: Type1FormatBitmap,
pub num_channels: u8,
pub channel_config: ChannelConfig,
pub string: Option<StringIndex>,
}
impl AudioStreamingInterface {
@@ -1023,6 +1023,77 @@ impl Descriptor for AudioStreamingInterface {
}
}
#[repr(u8)]
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum LockDelay {
Undefined(u16),
Milliseconds(u16),
DecodedSamples(u16),
}
impl LockDelay {
pub fn units(&self) -> u8 {
match self {
LockDelay::Undefined(_) => 0,
LockDelay::Milliseconds(_) => 1,
LockDelay::DecodedSamples(_) => 2,
}
}
pub fn value(&self) -> u16 {
match self {
LockDelay::Undefined(v) => *v,
LockDelay::Milliseconds(v) => *v,
LockDelay::DecodedSamples(v) => *v,
}
}
}
pub struct AudioStreamingEndpoint {
pub max_packets_only: bool,
pub pitch_control: AccessControl,
pub overrun_control: AccessControl,
pub underrun_control: AccessControl,
pub lock_delay: LockDelay,
}
impl AudioStreamingEndpoint {
fn bm_controls(&self) -> u8 {
(self.pitch_control as u8)
| (self.overrun_control as u8) << 2
| (self.underrun_control as u8) << 4
}
fn write_payload<T: embedded_io::Write>(
&self,
writer: &mut T,
) -> core::result::Result<(), T::Error> {
writer.write_u8(ClassSpecificEndpointDescriptorSubtype::General as u8)?; // bDescriptorSubtype
writer.write_u8((self.max_packets_only as u8) << 7)?; // bmAttributes
writer.write_u8(self.bm_controls())?; // bmControls
writer.write_u8(self.lock_delay.units())?; // bLockDelayUnits
writer.write_u16::<LittleEndian>(self.lock_delay.value())?; // wLockDelay
Ok(())
}
}
impl Descriptor for AudioStreamingEndpoint {
const MAX_SIZE: usize = 8;
fn size(&self) -> u8 {
Self::MAX_SIZE as u8
}
fn write<T: embedded_io::Write>(&self, writer: &mut T) -> Result<(), T::Error> {
writer.write_u8(self.size())?;
writer.write_u8(ClassSpecificDescriptorType::Endpoint as u8)?;
self.write_payload(writer)
}
fn write_descriptor<'w, 'd>(
&self,
writer: &'w mut DescriptorWriter<'d>,
) -> Result<(), DescriptorWriterError> {
let mut writer =
DescriptorWriterAdapter::new(writer, ClassSpecificDescriptorType::Endpoint);
self.write_payload(&mut writer)
}
}
#[cfg(test)]
extern crate std;
#[cfg(test)]
@@ -1539,7 +1610,7 @@ mod tests {
print!("{:02x} ", b);
}
println!();
write_usb_descriptor_pcap("./uac2.pcap", 0x02, 0, bytes);
write_usb_descriptor_pcap("./uac2.pcap", 0x02, 0, bytes).unwrap();
}
#[test]
@@ -1607,4 +1678,36 @@ mod tests {
]
);
}
#[test]
fn test_as_endpoint_desc() {
let ep = AudioStreamingEndpoint {
max_packets_only: true,
pitch_control: AccessControl::NotPresent,
overrun_control: AccessControl::ReadOnly,
underrun_control: AccessControl::Programmable,
lock_delay: LockDelay::DecodedSamples(1024),
};
let mut buf = [0u8; AudioStreamingEndpoint::MAX_SIZE];
let len = {
let mut cur = Cursor::new(&mut buf[..]);
ep.write(&mut cur).unwrap();
cur.position()
};
let descriptor = &buf[..len];
assert_eq!(
descriptor,
&[
8,
0x25, // CS_ENDPOINT
0x01, // EP_GENERAL
0x80, // bmAttributes
0 | (1 << 2) | (3 << 4), // bmControls
2, // bLockDelayUnits
(1024u16 & 0xff) as u8, // bLockDelay[0]
(1024u16 >> 8) as u8, // bLockDelay[1]
]
);
}
}
src/lib.rs
+242 -122
View File
@@ -10,10 +10,8 @@ use core::marker::PhantomData;
use constants::*;
use descriptors::*;
use usb_device::control::{Recipient, Request, RequestType};
use usb_device::device::DEFAULT_ALTERNATE_SETTING;
use usb_device::class_prelude::*;
use usb_device::endpoint::{self, Endpoint, EndpointDirection, In, Out};
use usb_device::{UsbDirection, class_prelude::*};
mod sealed {
pub trait Sealed {}
@@ -165,42 +163,58 @@ pub trait UsbAudioClockSource {
}
}
// This trait is needed since we specialize on D
trait TerminalConfigurationDescriptors {
fn get_configuration_descriptors(&self) -> (InputTerminal, OutputTerminal);
}
pub struct TerminalConfig<D: EndpointDirection> {
/// USB terminal in the D direction will have this id, audio terminal will have this id + 1
base_id: u8,
clock_source_id: u8,
num_channels: u8,
format: FormatType1,
terminal_type: TerminalType,
channel_config: ChannelConfig,
sync_type: IsochronousSynchronizationType,
lock_delay: LockDelay,
string: Option<StringIndex>,
_direction: PhantomData<D>,
}
impl<'a, D: EndpointDirection> TerminalConfig<D> {
// TODO: builder pattern
impl<D: EndpointDirection> TerminalConfig<D> {
pub fn new(
base_id: u8,
clock_source_id: u8,
num_channels: u8,
format: FormatType1,
terminal_type: TerminalType,
channel_config: ChannelConfig,
sync_type: IsochronousSynchronizationType,
lock_delay: LockDelay,
string: Option<StringIndex>,
) -> Self {
TerminalConfig {
base_id,
clock_source_id,
num_channels,
format,
terminal_type,
channel_config,
sync_type,
lock_delay,
string,
_direction: PhantomData,
}
}
}
impl<'a> TerminalConfig<In> {
fn get_configuration_descriptors(&self, start_id: u8) -> (InputTerminal, OutputTerminal) {
impl<'a> TerminalConfigurationDescriptors for TerminalConfig<In> {
fn get_configuration_descriptors(&self) -> (InputTerminal, OutputTerminal) {
let input_terminal = InputTerminal {
id: start_id,
id: self.base_id,
terminal_type: TerminalType::UsbStreaming,
assoc_terminal: start_id + 1,
assoc_terminal: self.base_id + 1,
clock_source: self.clock_source_id,
num_channels: self.num_channels,
channel_config: self.channel_config,
@@ -215,10 +229,10 @@ impl<'a> TerminalConfig<In> {
string: None,
};
let output_terminal = OutputTerminal {
id: start_id + 1,
id: self.base_id + 1,
terminal_type: self.terminal_type,
assoc_terminal: start_id,
source_id: start_id,
assoc_terminal: self.base_id,
source_id: self.base_id,
clock_source: self.clock_source_id,
copy_protect_control: AccessControl::NotPresent,
connector_control: AccessControl::NotPresent,
@@ -232,13 +246,13 @@ impl<'a> TerminalConfig<In> {
// fn get_interface_descriptor(&self, id: InterfaceIndex) )
}
impl<'a> TerminalConfig<Out> {
fn get_configuration_descriptors(&self, start_id: u8) -> (OutputTerminal, InputTerminal) {
impl<'a> TerminalConfigurationDescriptors for TerminalConfig<Out> {
fn get_configuration_descriptors(&self) -> (InputTerminal, OutputTerminal) {
let output_terminal = OutputTerminal {
id: start_id,
id: self.base_id,
terminal_type: TerminalType::UsbStreaming,
assoc_terminal: start_id + 1,
source_id: start_id + 1,
assoc_terminal: self.base_id + 1,
source_id: self.base_id + 1,
clock_source: self.clock_source_id,
copy_protect_control: AccessControl::NotPresent,
connector_control: AccessControl::NotPresent,
@@ -248,9 +262,9 @@ impl<'a> TerminalConfig<Out> {
string: self.string,
};
let input_terminal = InputTerminal {
id: start_id + 1,
id: self.base_id + 1,
terminal_type: self.terminal_type,
assoc_terminal: start_id,
assoc_terminal: self.base_id,
clock_source: self.clock_source_id,
num_channels: self.num_channels,
channel_config: self.channel_config,
@@ -264,34 +278,42 @@ impl<'a> TerminalConfig<Out> {
phantom_power_control: AccessControl::NotPresent,
string: self.string,
};
(output_terminal, input_terminal)
(input_terminal, output_terminal)
}
fn write_interface_descriptors(
&self,
writer: &mut DescriptorWriter,
if_id: InterfaceNumber,
) -> usb_device::Result<()> {
writer.interface(
if_id,
AUDIO,
InterfaceSubclass::AudioStreaming as u8,
InterfaceProtocol::Version2 as u8,
)?;
writer.interface_alt(
if_id,
1,
AUDIO,
InterfaceSubclass::AudioStreaming as u8,
InterfaceProtocol::Version2 as u8,
None,
)?;
}
impl<D: EndpointDirection> TerminalConfig<D> {}
// TODO:
// 1. Interface specific AS_GENERAL descriptor (4.9.2)
// 2. Format Type I descriptor
// 3. Endpoint descriptor
#[derive(Copy, Clone, Debug)]
pub enum UsbSpeed {
Low, // Not supported for audio
Full,
High,
Super, // Not supported by crate
}
Ok(())
/// Since usb-device doesn't expose the underlying speed of the bus, the user needs to provide an implementation.
///
///
///
/// This will be called whenever descriptors are sent to the host..
pub trait UsbSpeedProvider {
fn speed(&self) -> UsbSpeed;
}
/// Convenience implementation of UsbSpeedProvider for devices which only support one speed.
pub struct ConstSpeedProvider {
speed: UsbSpeed,
}
impl ConstSpeedProvider {
pub const fn new(speed: UsbSpeed) -> Self {
ConstSpeedProvider { speed }
}
}
impl UsbSpeedProvider for ConstSpeedProvider {
fn speed(&self) -> UsbSpeed {
self.speed
}
}
@@ -313,7 +335,8 @@ impl<'a> TerminalConfig<Out> {
/// A single Clock Source is always required, but a fully custom descriptor set can be built by only providing
/// the Clock Source and additional descriptors, if the Terminal descriptors are inappropriate.
///
pub struct AudioClassConfig<'a, CS: UsbAudioClockSource> {
pub struct AudioClassConfig<'a, CS: UsbAudioClockSource, SP: UsbSpeedProvider> {
pub speed_provider: SP,
pub device_category: FunctionCode,
pub clock: CS,
pub input_config: Option<TerminalConfig<Out>>,
@@ -321,9 +344,10 @@ pub struct AudioClassConfig<'a, CS: UsbAudioClockSource> {
pub additional_descriptors: Option<&'a [AudioClassDescriptor]>,
}
impl<'a, CS: UsbAudioClockSource> AudioClassConfig<'a, CS> {
pub fn new(device_category: FunctionCode, clock: CS) -> Self {
impl<'a, SP: UsbSpeedProvider, CS: UsbAudioClockSource> AudioClassConfig<'a, CS, SP> {
pub fn new(speed_provider: SP, device_category: FunctionCode, clock: CS) -> Self {
Self {
speed_provider,
device_category,
clock,
input_config: None,
@@ -346,67 +370,10 @@ impl<'a, CS: UsbAudioClockSource> AudioClassConfig<'a, CS> {
self.additional_descriptors = Some(additional_descriptors);
self
}
/// Writes the class-specific configuration descriptor set (after bDescriptortype INTERFACE)
fn get_configuration_descriptors(
&self,
writer: &mut DescriptorWriter<'_>,
) -> usb_device::Result<()> {
// CONFIGURATION DESCRIPTORS //
let mut total_length: u16 = 9; // HEADER
let clock_desc = self.clock.get_configuration_descriptor(1, None)?;
total_length += clock_desc.size() as u16;
let output_descs = match &self.output_config {
Some(config) => {
let descs = config.get_configuration_descriptors(2);
total_length += descs.0.size() as u16 + descs.1.size() as u16;
Some(descs)
}
None => None,
};
let input_descs = match &self.input_config {
Some(config) => {
let descs = config.get_configuration_descriptors(4);
total_length += descs.0.size() as u16 + descs.1.size() as u16;
Some(descs)
}
None => None,
};
let additional_descs = match &self.additional_descriptors {
Some(descs) => {
total_length += descs.iter().map(|desc| desc.size() as u16).sum::<u16>();
Some(descs)
}
None => None,
};
let ac_header: [u8; 7] = [
ClassSpecificACInterfaceDescriptorSubtype::Header as u8,
0, // bcdADC[0]
2, // bcdADC[1]
self.device_category as u8, // bCategory
(total_length & 0xff) as u8, // wTotalLength LSB
((total_length >> 8) & 0xff) as u8, // wTotalLength MSB
0, // bmControls
];
writer.write(ClassSpecificDescriptorType::Interface as u8, &ac_header)?;
clock_desc.write_descriptor(writer)?;
if let Some((a, b)) = output_descs {
a.write_descriptor(writer)?;
b.write_descriptor(writer)?;
}
if let Some((a, b)) = input_descs {
a.write_descriptor(writer)?;
b.write_descriptor(writer)?;
}
if let Some(descs) = additional_descs {
for desc in descs.into_iter() {
desc.write_descriptor(writer)?;
}
}
// INTERFACE DESCRIPTORS //
Ok(())
}
// pub fn build<'a, B: UsbBus>(self, alloc: &'a UsbBusAllocator) -> Result<AudioClass<'a, B>> {
// Err(Error::InvalidValue)
// }
}
/// USB audio errors, including possible USB Stack errors
@@ -426,44 +393,197 @@ impl From<UsbError> for Error {
type Result<T> = core::result::Result<T, Error>;
struct AudioStream<'a, B: UsbBus, D: EndpointDirection> {
// UsbStreaming terminal ID
config: TerminalConfig<D>,
interface: InterfaceNumber,
endpoint: Endpoint<'a, B, D>,
alt_setting: u8,
}
pub struct AudioClass<'a, CS: UsbAudioClockSource> {
control_iface: InterfaceNumber,
config: AudioClassConfig<'a, CS>,
impl<'a, B: UsbBus, D: EndpointDirection> AudioStream<'a, B, D> {
fn write_interface_descriptors(&self, writer: &mut DescriptorWriter) -> usb_device::Result<()> {
// UAC2 4.9.1 Standard AS Interface Descriptor
// zero bandwidth configuration per 3.16.2
//
// Whenever an AudioStreaming interface requires an isochronous data
// endpoint, it must at least provide the default Alternate Setting
// (Alternate Setting 0) with zero bandwidth requirements (no
// isochronous data endpoint defined) and an additional Alternate
// Setting that contains the actual isochronous data endpoint.
writer.interface(
self.interface,
AUDIO,
InterfaceSubclass::AudioStreaming as u8,
InterfaceProtocol::Version2 as u8,
)?;
// UAC2 4.9.1 Standard AS Interface Descriptor
// live data configuration
writer.interface_alt(
self.interface,
1,
AUDIO,
InterfaceSubclass::AudioStreaming as u8,
InterfaceProtocol::Version2 as u8,
None,
)?;
// UAC2 4.9.2 Class-Specific AS Interface Descriptor
let as_general = AudioStreamingInterface {
terminal_id: self.config.base_id, // Always the USB streaming terminal id
active_alt_setting: AccessControl::NotPresent,
valid_alt_settings: AccessControl::NotPresent,
format_type: FormatType::Type1,
format_bitmap: Type1FormatBitmap::Pcm, // only PCM is supported
num_channels: self.config.num_channels,
channel_config: self.config.channel_config,
string: self.config.string,
};
as_general.write_descriptor(writer)?;
// UAC2 4.9.3 Class-Specific AS Format Type Descriptor
self.config.format.write_descriptor(writer)?;
Ok(())
}
fn write_endpoint_descriptors(&self, writer: &mut DescriptorWriter) -> usb_device::Result<()> {
// UAC2 4.10.1.1 Standard AS Isochronous Audio Data Endpoint Descriptor
writer.endpoint(&self.endpoint)?;
// UAC2 4.10.1.2 Class-Specific AS Isochronous Audio Data Endpoint Descriptor
let cs_ep = AudioStreamingEndpoint {
max_packets_only: false,
pitch_control: AccessControl::NotPresent,
overrun_control: AccessControl::NotPresent,
underrun_control: AccessControl::NotPresent,
lock_delay: self.config.lock_delay,
};
cs_ep.write_descriptor(writer)?;
Ok(())
}
}
impl<CS: UsbAudioClockSource> AudioClass<'_, CS> {}
pub struct AudioClass<'a, B: UsbBus, CS: UsbAudioClockSource, SP: UsbSpeedProvider> {
config: AudioClassConfig<'a, CS, SP>,
control_iface: InterfaceNumber,
output: Option<AudioStream<'a, B, Out>>,
input: Option<AudioStream<'a, B, In>>,
feedback: Option<Endpoint<'a, B, In>>,
}
impl<B: UsbBus, CS: UsbAudioClockSource> UsbClass<B> for AudioClass<'_, CS> {
fn get_configuration_descriptors(
&self,
writer: &mut DescriptorWriter,
) -> usb_device::Result<()> {
// IN, OUT, CONTROL
let n_interfaces = self.config.input_config.is_some() as u8
+ self.config.output_config.is_some() as u8
+ 1;
impl<'a, B: UsbBus, CS: UsbAudioClockSource, SP: UsbSpeedProvider> AudioClass<'a, B, CS, SP> {
fn get_interface_descriptors(&self, writer: &mut DescriptorWriter) -> usb_device::Result<()> {
// Control + 1 or 2 streaming
let n_interfaces = 1
+ (self.config.input_config.is_some() as u8)
+ (self.config.output_config.is_some() as u8);
// UAC2 4.6 Interface Association Descriptor
writer.iad(
self.control_iface,
n_interfaces,
AUDIO,
FunctionSubclass::Undefined as u8,
InterfaceSubclass::AudioControl as u8,
FunctionProtocol::Version2 as u8,
None,
)?;
// UAC2 4.7 Standard AC Interface Descriptor
writer.interface(
self.control_iface,
0,
AUDIO,
InterfaceSubclass::AudioControl as u8,
InterfaceProtocol::Version2 as u8,
)?;
self.config.get_configuration_descriptors(writer)?;
// BUILD CONFIGURATION DESCRIPTORS //
let mut total_length: u16 = 9; // HEADER
let clock_desc = self.config.clock.get_configuration_descriptor(1, None)?;
total_length += clock_desc.size() as u16;
let output_descs = match &self.config.output_config {
Some(config) => {
let descs = config.get_configuration_descriptors();
total_length += descs.0.size() as u16 + descs.1.size() as u16;
Some(descs)
}
None => None,
};
let input_descs = match &self.config.input_config {
Some(config) => {
let descs = config.get_configuration_descriptors();
total_length += descs.0.size() as u16 + descs.1.size() as u16;
Some(descs)
}
None => None,
};
let additional_descs = match &self.config.additional_descriptors {
Some(descs) => {
total_length += descs.iter().map(|desc| desc.size() as u16).sum::<u16>();
Some(descs)
}
None => None,
};
// UAC2 4.7.2 Class-specific AC Interface Descriptor
let ac_header: [u8; 7] = [
ClassSpecificACInterfaceDescriptorSubtype::Header as u8,
0, // bcdADC[0]
2, // bcdADC[1]
self.config.device_category as u8, // bCategory
(total_length & 0xff) as u8, // wTotalLength LSB
((total_length >> 8) & 0xff) as u8, // wTotalLength MSB
0, // bmControls
];
writer.write(ClassSpecificDescriptorType::Interface as u8, &ac_header)?;
// UAC2 4.7.2.1 Clock Source Descriptor
clock_desc.write_descriptor(writer)?;
// UAC2 4.7.2.4 & 4.7.2.5 Input & Output Terminal Descriptors
if let Some((a, b)) = output_descs {
a.write_descriptor(writer)?;
b.write_descriptor(writer)?;
}
if let Some((a, b)) = input_descs {
a.write_descriptor(writer)?;
b.write_descriptor(writer)?;
}
// UAC2 4.7
if let Some(descs) = additional_descs {
for desc in descs.into_iter() {
desc.write_descriptor(writer)?;
}
}
// UAC2 4.9 & 2.4.10
if let Some(stream) = &self.output {
stream.write_interface_descriptors(writer)?;
stream.write_endpoint_descriptors(writer)?;
}
// UAC2 4.9.2.1 Feedback Endpoint Descriptor
// Should always be present if an OUT endpoint is present
if let Some(feedback) = &self.feedback {
writer.endpoint(feedback)?;
}
if let Some(stream) = &self.input {
stream.write_interface_descriptors(writer)?;
stream.write_endpoint_descriptors(writer)?;
}
Ok(())
}
}
impl<B: UsbBus, CS: UsbAudioClockSource, SP: UsbSpeedProvider> UsbClass<B>
for AudioClass<'_, B, CS, SP>
{
/// Writes the class-specific configuration descriptor set (after bDescriptortype INTERFACE)
fn get_configuration_descriptors(
&self,
writer: &mut DescriptorWriter<'_>,
) -> usb_device::Result<()> {
self.get_interface_descriptors(writer)?;
Ok(())
}