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usb: builtin handling of interface alternate settings

Browse Source 
The stack reads its own descriptors to figure out which endpoints
are used in which alt settings, and enables/disables them as needed.

The ControlHandler has a callback so it can get notified of alternate
setting changes, which is purely informative (it doesn't have to do anything).
This commit is contained in:
Dario Nieuwenhuis 2022-04-16 04:47:27 +02:00
parent ea0a701ebd
commit 092c2b7dfe
9 changed files with 357 additions and 146 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

110
embassy-nrf/src/usb.rs
View File

@ -194,16 +194,12 @@ impl<'d, T: Instance> driver::Driver<'d> for Driver<'d, T> {
fn into_bus(self) -> Self::Bus {
Bus {
phantom: PhantomData,
alloc_in: self.alloc_in,
alloc_out: self.alloc_out,
}
}
}
pub struct Bus<'d, T: Instance> {
phantom: PhantomData<&'d mut T>,
alloc_in: Allocator,
alloc_out: Allocator,
}
impl<'d, T: Instance> driver::Bus for Bus<'d, T> {
@ -264,7 +260,16 @@ impl<'d, T: Instance> driver::Bus for Bus<'d, T> {
if regs.events_usbreset.read().bits() != 0 {
regs.events_usbreset.reset();
regs.intenset.write(|w| w.usbreset().set());
self.set_configured(false);
// Disable all endpoints except EP0
regs.epinen.write(|w| unsafe { w.bits(0x01) });
regs.epouten.write(|w| unsafe { w.bits(0x01) });
READY_ENDPOINTS.store(In::mask(0), Ordering::Release);
for i in 1..=7 {
In::waker(i).wake();
Out::waker(i).wake();
}
return Poll::Ready(Event::Reset);
}
@ -297,57 +302,76 @@ impl<'d, T: Instance> driver::Bus for Bus<'d, T> {
}
#[inline]
fn set_configured(&mut self, configured: bool) {
fn set_address(&mut self, _addr: u8) {
// Nothing to do, the peripheral handles this.
}
fn endpoint_set_stalled(&mut self, ep_addr: EndpointAddress, stalled: bool) {
Driver::<T>::set_stalled(ep_addr, stalled)
}
fn endpoint_is_stalled(&mut self, ep_addr: EndpointAddress) -> bool {
Driver::<T>::is_stalled(ep_addr)
}
fn endpoint_set_enabled(&mut self, ep_addr: EndpointAddress, enabled: bool) {
let regs = T::regs();
unsafe {
if configured {
// TODO: Initialize ISO buffers
let i = ep_addr.index();
let mask = 1 << i;
regs.epinen.write(|w| w.bits(self.alloc_in.used.into()));
regs.epouten.write(|w| w.bits(self.alloc_out.used.into()));
debug!("endpoint_set_enabled {:?} {}", ep_addr, enabled);
for i in 1..8 {
let out_enabled = self.alloc_out.used & (1 << i) != 0;
match ep_addr.direction() {
UsbDirection::In => {
let mut was_enabled = false;
regs.epinen.modify(|r, w| {
let mut bits = r.bits();
was_enabled = (bits & mask) != 0;
if enabled {
bits |= mask
} else {
bits &= !mask
}
unsafe { w.bits(bits) }
});
let ready_mask = In::mask(i);
if enabled {
if !was_enabled {
READY_ENDPOINTS.fetch_or(ready_mask, Ordering::AcqRel);
}
} else {
READY_ENDPOINTS.fetch_and(!ready_mask, Ordering::AcqRel);
}
In::waker(i).wake();
}
UsbDirection::Out => {
regs.epouten.modify(|r, w| {
let mut bits = r.bits();
if enabled {
bits |= mask
} else {
bits &= !mask
}
unsafe { w.bits(bits) }
});
let ready_mask = Out::mask(i);
if enabled {
// when first enabled, bulk/interrupt OUT endpoints will *not* receive data (the
// peripheral will NAK all incoming packets) until we write a zero to the SIZE
// register (see figure 203 of the 52840 manual). To avoid that we write a 0 to the
// SIZE register
if out_enabled {
regs.size.epout[i].reset();
}
regs.size.epout[i].reset();
} else {
READY_ENDPOINTS.fetch_and(!ready_mask, Ordering::AcqRel);
}
// IN endpoints (low bits) default to ready.
// OUT endpoints (high bits) default to NOT ready, they become ready when data comes in.
READY_ENDPOINTS.store(0x0000FFFF, Ordering::Release);
} else {
// Disable all endpoints except EP0
regs.epinen.write(|w| w.bits(0x01));
regs.epouten.write(|w| w.bits(0x01));
READY_ENDPOINTS.store(In::mask(0), Ordering::Release);
Out::waker(i).wake();
}
}
for i in 1..=7 {
In::waker(i).wake();
Out::waker(i).wake();
}
}
#[inline]
fn set_device_address(&mut self, _addr: u8) {
// Nothing to do, the peripheral handles this.
}
fn set_stalled(&mut self, ep_addr: EndpointAddress, stalled: bool) {
Driver::<T>::set_stalled(ep_addr, stalled)
}
fn is_stalled(&mut self, ep_addr: EndpointAddress) -> bool {
Driver::<T>::is_stalled(ep_addr)
}
#[inline]

21
embassy-usb-hid/src/lib.rs
View File

@ -438,6 +438,14 @@ impl<'d> ControlHandler for Control<'d> {
self.out_report_offset.store(0, Ordering::Release);
}
fn get_descriptor<'a>(&'a mut self, req: Request, buf: &'a mut [u8]) -> InResponse<'a> {
match (req.value >> 8) as u8 {
HID_DESC_DESCTYPE_HID_REPORT => InResponse::Accepted(self.report_descriptor),
HID_DESC_DESCTYPE_HID => InResponse::Accepted(&self.hid_descriptor),
_ => InResponse::Rejected,
}
}
fn control_out(&mut self, req: embassy_usb::control::Request, data: &[u8]) -> OutResponse {
trace!("HID control_out {:?} {=[u8]:x}", req, data);
if let RequestType::Class = req.request_type {
@ -477,13 +485,8 @@ impl<'d> ControlHandler for Control<'d> {
fn control_in<'a>(&'a mut self, req: Request, buf: &'a mut [u8]) -> InResponse<'a> {
trace!("HID control_in {:?}", req);
match (req.request_type, req.request) {
(RequestType::Standard, Request::GET_DESCRIPTOR) => match (req.value >> 8) as u8 {
HID_DESC_DESCTYPE_HID_REPORT => InResponse::Accepted(self.report_descriptor),
HID_DESC_DESCTYPE_HID => InResponse::Accepted(&self.hid_descriptor),
_ => InResponse::Rejected,
},
(RequestType::Class, HID_REQ_GET_REPORT) => {
match req.request {
HID_REQ_GET_REPORT => {
let size = match ReportId::try_from(req.value) {
Ok(id) => self.request_handler.and_then(|x| x.get_report(id, buf)),
Err(_) => None,
@ -495,7 +498,7 @@ impl<'d> ControlHandler for Control<'d> {
InResponse::Rejected
}
}
(RequestType::Class, HID_REQ_GET_IDLE) => {
HID_REQ_GET_IDLE => {
if let Some(handler) = self.request_handler {
let id = req.value as u8;
let id = (id != 0).then(|| ReportId::In(id));
@ -510,7 +513,7 @@ impl<'d> ControlHandler for Control<'d> {
InResponse::Rejected
}
}
(RequestType::Class, HID_REQ_GET_PROTOCOL) => {
HID_REQ_GET_PROTOCOL => {
// UNSUPPORTED: Boot Protocol
buf[0] = 1;
InResponse::Accepted(&buf[0..1])

23
embassy-usb/src/builder.rs
View File

@ -1,5 +1,7 @@
use heapless::Vec;
use crate::Interface;
use super::control::ControlHandler;
use super::descriptor::{BosWriter, DescriptorWriter};
use super::driver::{Driver, Endpoint};
@ -121,11 +123,10 @@ impl<'a> Config<'a> {
pub struct Builder<'d, D: Driver<'d>> {
config: Config<'d>,
handler: Option<&'d dyn DeviceStateHandler>,
interfaces: Vec<(u8, &'d mut dyn ControlHandler), MAX_INTERFACE_COUNT>,
interfaces: Vec<Interface<'d>, MAX_INTERFACE_COUNT>,
control_buf: &'d mut [u8],
driver: D,
next_interface_number: u8,
next_string_index: u8,
device_descriptor: DescriptorWriter<'d>,
@ -180,7 +181,6 @@ impl<'d, D: Driver<'d>> Builder<'d, D> {
config,
interfaces: Vec::new(),
control_buf,
next_interface_number: 0,
next_string_index: 4,
device_descriptor,
@ -234,7 +234,7 @@ impl<'d, D: Driver<'d>> Builder<'d, D> {
) -> FunctionBuilder<'_, 'd, D> {
let iface_count_index = if self.config.composite_with_iads {
self.config_descriptor.iad(
InterfaceNumber::new(self.next_interface_number),
InterfaceNumber::new(self.interfaces.len() as _),
0,
class,
subclass,
@ -275,13 +275,15 @@ impl<'a, 'd, D: Driver<'d>> FunctionBuilder<'a, 'd, D> {
self.builder.config_descriptor.buf[i] += 1;
}
let number = self.builder.next_interface_number;
self.builder.next_interface_number += 1;
let number = self.builder.interfaces.len() as _;
let iface = Interface {
handler,
current_alt_setting: 0,
num_alt_settings: 0,
};
if let Some(handler) = handler {
if self.builder.interfaces.push((number, handler)).is_err() {
panic!("max interface count reached")
}
if self.builder.interfaces.push(iface).is_err() {
panic!("max interface count reached")
}
InterfaceBuilder {
@ -318,6 +320,7 @@ impl<'a, 'd, D: Driver<'d>> InterfaceBuilder<'a, 'd, D> {
) -> InterfaceAltBuilder<'_, 'd, D> {
let number = self.next_alt_setting_number;
self.next_alt_setting_number += 1;
self.builder.interfaces[self.interface_number.0 as usize].num_alt_settings += 1;
self.builder.config_descriptor.interface_alt(
self.interface_number,

37
embassy-usb/src/control.rs
View File

@ -2,7 +2,6 @@ use core::mem;
use crate::descriptor::DescriptorWriter;
use crate::driver::{self, EndpointError};
use crate::DEFAULT_ALTERNATE_SETTING;
use super::types::*;
@ -150,6 +149,10 @@ pub trait ControlHandler {
/// Called after a USB reset after the bus reset sequence is complete.
fn reset(&mut self) {}
fn set_alternate_setting(&mut self, alternate_setting: u8) {
let _ = alternate_setting;
}
/// Called when a control request is received with direction HostToDevice.
///
/// # Arguments
@ -163,8 +166,8 @@ pub trait ControlHandler {
/// Called when a control request is received with direction DeviceToHost.
///
/// You should write the response to `resp`, then return `InResponse::Accepted(len)`
/// with the length of the response.
/// You should write the response somewhere (usually to `buf`, but you may use another buffer
/// owned by yourself, or a static buffer), then return `InResponse::Accepted(data)`.
///
/// # Arguments
///
@ -174,23 +177,17 @@ pub trait ControlHandler {
InResponse::Rejected
}
fn set_interface(&mut self, alternate_setting: u16) -> OutResponse {
if alternate_setting == u16::from(DEFAULT_ALTERNATE_SETTING) {
OutResponse::Accepted
} else {
OutResponse::Rejected
}
}
fn get_interface<'a>(&'a mut self, buf: &'a mut [u8]) -> InResponse<'a> {
buf[0] = DEFAULT_ALTERNATE_SETTING;
InResponse::Accepted(&buf[0..1])
}
fn get_status<'a>(&'a mut self, buf: &'a mut [u8]) -> InResponse {
let status: u16 = 0;
buf[0..2].copy_from_slice(&status.to_le_bytes());
InResponse::Accepted(&buf[0..2])
/// Called when a GET DESCRIPTOR control request is received on the interface.
///
/// You should write the response somewhere (usually to `buf`, but you may use another buffer
/// owned by yourself, or a static buffer), then return `InResponse::Accepted(data)`.
///
/// # Arguments
///
/// * `req` - The request from the SETUP packet.
fn get_descriptor<'a>(&'a mut self, req: Request, buf: &'a mut [u8]) -> InResponse<'a> {
let _ = (req, buf);
InResponse::Rejected
}
}

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

@ -1,5 +1,5 @@
use super::builder::Config;
use super::{types::*, CONFIGURATION_VALUE, DEFAULT_ALTERNATE_SETTING};
use super::{types::*, CONFIGURATION_VALUE};
/// Standard descriptor types
#[allow(missing_docs)]
@ -192,7 +192,7 @@ impl<'a> DescriptorWriter<'a> {
interface_protocol: u8,
interface_string: Option<StringIndex>,
) {
if alternate_setting == DEFAULT_ALTERNATE_SETTING {
if alternate_setting == 0 {
match self.num_interfaces_mark {
Some(mark) => self.buf[mark] += 1,
None => {

110
embassy-usb/src/descriptor_reader.rs Normal file
View File

@ -0,0 +1,110 @@
use crate::descriptor::descriptor_type;
use crate::types::EndpointAddress;
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub struct ReadError;
pub struct Reader<'a> {
data: &'a [u8],
}
impl<'a> Reader<'a> {
pub fn new(data: &'a [u8]) -> Self {
Self { data }
}
pub fn eof(&self) -> bool {
self.data.is_empty()
}
pub fn read<const N: usize>(&mut self) -> Result<[u8; N], ReadError> {
let n = self.data.get(0..N).ok_or(ReadError)?;
self.data = &self.data[N..];
Ok(n.try_into().unwrap())
}
pub fn read_u8(&mut self) -> Result<u8, ReadError> {
Ok(u8::from_le_bytes(self.read()?))
}
pub fn read_u16(&mut self) -> Result<u16, ReadError> {
Ok(u16::from_le_bytes(self.read()?))
}
pub fn read_slice(&mut self, len: usize) -> Result<&'a [u8], ReadError> {
let res = self.data.get(0..len).ok_or(ReadError)?;
self.data = &self.data[len..];
Ok(res)
}
pub fn read_descriptors(&mut self) -> DescriptorIter<'_, 'a> {
DescriptorIter { r: self }
}
}
pub struct DescriptorIter<'a, 'b> {
r: &'a mut Reader<'b>,
}
impl<'a, 'b> Iterator for DescriptorIter<'a, 'b> {
type Item = Result<(u8, Reader<'a>), ReadError>;
fn next(&mut self) -> Option<Self::Item> {
if self.r.eof() {
return None;
}
let len = match self.r.read_u8() {
Ok(x) => x,
Err(e) => return Some(Err(e)),
};
let type_ = match self.r.read_u8() {
Ok(x) => x,
Err(e) => return Some(Err(e)),
};
let data = match self.r.read_slice(len as usize - 2) {
Ok(x) => x,
Err(e) => return Some(Err(e)),
};
Some(Ok((type_, Reader::new(data))))
}
}
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub struct EndpointInfo {
pub configuration: u8,
pub interface: u8,
pub interface_alt: u8,
pub ep_address: EndpointAddress,
}
pub fn foreach_endpoint(data: &[u8], mut f: impl FnMut(EndpointInfo)) -> Result<(), ReadError> {
let mut ep = EndpointInfo {
configuration: 0,
interface: 0,
interface_alt: 0,
ep_address: EndpointAddress::from(0),
};
for res in Reader::new(data).read_descriptors() {
let (kind, mut r) = res?;
match kind {
descriptor_type::CONFIGURATION => {
let _total_length = r.read_u16()?;
let _total_length = r.read_u8()?;
ep.configuration = r.read_u8()?;
}
descriptor_type::INTERFACE => {
ep.interface = r.read_u8()?;
ep.interface_alt = r.read_u8()?;
}
descriptor_type::ENDPOINT => {
ep.ep_address = EndpointAddress::from(r.read_u8()?);
f(ep)
}
_ => {}
}
}
Ok(())
}

10
embassy-usb/src/driver.rs
View File

@ -79,17 +79,17 @@ pub trait Bus {
fn poll<'a>(&'a mut self) -> Self::PollFuture<'a>;
/// Sets the device USB address to `addr`.
fn set_device_address(&mut self, addr: u8);
fn set_address(&mut self, addr: u8);
/// Sets the device configured state.
fn set_configured(&mut self, configured: bool);
/// Enables or disables an endpoint.
fn endpoint_set_enabled(&mut self, ep_addr: EndpointAddress, enabled: bool);
/// Sets or clears the STALL condition for an endpoint. If the endpoint is an OUT endpoint, it
/// should be prepared to receive data again. Only used during control transfers.
fn set_stalled(&mut self, ep_addr: EndpointAddress, stalled: bool);
fn endpoint_set_stalled(&mut self, ep_addr: EndpointAddress, stalled: bool);
/// Gets whether the STALL condition is set for an endpoint. Only used during control transfers.
fn is_stalled(&mut self, ep_addr: EndpointAddress) -> bool;
fn endpoint_is_stalled(&mut self, ep_addr: EndpointAddress) -> bool;
/// Simulates a disconnect from the USB bus, causing the host to reset and re-enumerate the
/// device.

186
embassy-usb/src/lib.rs
View File

@ -8,12 +8,15 @@ pub(crate) mod fmt;
mod builder;
pub mod control;
pub mod descriptor;
mod descriptor_reader;
pub mod driver;
pub mod types;
use embassy::util::{select, Either};
use heapless::Vec;
use crate::descriptor_reader::foreach_endpoint;
use self::control::*;
use self::descriptor::*;
use self::driver::{Bus, Driver, Event};
@ -61,9 +64,6 @@ pub const CONFIGURATION_NONE: u8 = 0;
/// The bConfiguration value for the single configuration supported by this device.
pub const CONFIGURATION_VALUE: u8 = 1;
/// The default value for bAlternateSetting for all interfaces.
pub const DEFAULT_ALTERNATE_SETTING: u8 = 0;
pub const MAX_INTERFACE_COUNT: usize = 4;
/// A handler trait for changes in the device state of the [UsbDevice].
@ -87,6 +87,12 @@ pub trait DeviceStateHandler {
fn remote_wakeup_enabled(&self, _enabled: bool) {}
}
struct Interface<'d> {
handler: Option<&'d mut dyn ControlHandler>,
current_alt_setting: u8,
num_alt_settings: u8,
}
pub struct UsbDevice<'d, D: Driver<'d>> {
bus: D::Bus,
handler: Option<&'d dyn DeviceStateHandler>,
@ -104,7 +110,7 @@ pub struct UsbDevice<'d, D: Driver<'d>> {
self_powered: bool,
pending_address: u8,
interfaces: Vec<(u8, &'d mut dyn ControlHandler), MAX_INTERFACE_COUNT>,
interfaces: Vec<Interface<'d>, MAX_INTERFACE_COUNT>,
}
impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
@ -115,7 +121,7 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
device_descriptor: &'d [u8],
config_descriptor: &'d [u8],
bos_descriptor: &'d [u8],
interfaces: Vec<(u8, &'d mut dyn ControlHandler), MAX_INTERFACE_COUNT>,
interfaces: Vec<Interface<'d>, MAX_INTERFACE_COUNT>,
control_buf: &'d mut [u8],
) -> UsbDevice<'d, D> {
let control = driver
@ -247,8 +253,12 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
self.remote_wakeup_enabled = false;
self.pending_address = 0;
for (_, h) in self.interfaces.iter_mut() {
h.reset();
for iface in self.interfaces.iter_mut() {
iface.current_alt_setting = 0;
if let Some(h) = &mut iface.handler {
h.reset();
h.set_alternate_setting(0);
}
}
if let Some(h) = &self.handler {
@ -302,7 +312,7 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
}
(Request::SET_ADDRESS, addr @ 1..=127) => {
self.pending_address = addr as u8;
self.bus.set_device_address(self.pending_address);
self.bus.set_address(self.pending_address);
self.device_state = UsbDeviceState::Addressed;
if let Some(h) = &self.handler {
h.addressed(self.pending_address);
@ -310,59 +320,110 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
self.control.accept(stage)
}
(Request::SET_CONFIGURATION, CONFIGURATION_VALUE_U16) => {
debug!("SET_CONFIGURATION: configured");
self.device_state = UsbDeviceState::Configured;
self.bus.set_configured(true);
// Enable all endpoints of selected alt settings.
foreach_endpoint(self.config_descriptor, |ep| {
let iface = &self.interfaces[ep.interface as usize];
self.bus.endpoint_set_enabled(
ep.ep_address,
iface.current_alt_setting == ep.interface_alt,
);
})
.unwrap();
// Notify handler.
if let Some(h) = &self.handler {
h.configured(true);
}
self.control.accept(stage)
}
(Request::SET_CONFIGURATION, CONFIGURATION_NONE_U16) => match self.device_state {
UsbDeviceState::Default => self.control.accept(stage),
_ => {
debug!("SET_CONFIGURATION: unconfigured");
self.device_state = UsbDeviceState::Addressed;
self.bus.set_configured(false);
// Disable all endpoints.
foreach_endpoint(self.config_descriptor, |ep| {
self.bus.endpoint_set_enabled(ep.ep_address, false);
})
.unwrap();
// Notify handler.
if let Some(h) = &self.handler {
h.configured(false);
}
self.control.accept(stage)
}
},
_ => self.control.reject(),
},
(RequestType::Standard, Recipient::Interface) => {
let iface = match self.interfaces.get_mut(req.index as usize) {
Some(iface) => iface,
None => return self.control.reject(),
};
match req.request {
Request::SET_INTERFACE => {
let new_altsetting = req.value as u8;
if new_altsetting >= iface.num_alt_settings {
warn!("SET_INTERFACE: trying to select alt setting out of range.");
return self.control.reject();
}
iface.current_alt_setting = new_altsetting;
// Enable/disable EPs of this interface as needed.
foreach_endpoint(self.config_descriptor, |ep| {
if ep.interface == req.index as u8 {
self.bus.endpoint_set_enabled(
ep.ep_address,
iface.current_alt_setting == ep.interface_alt,
);
}
})
.unwrap();
// TODO check it is valid (not out of range)
// TODO actually enable/disable endpoints.
if let Some(handler) = &mut iface.handler {
handler.set_alternate_setting(new_altsetting);
}
self.control.accept(stage)
}
_ => self.control.reject(),
}
}
(RequestType::Standard, Recipient::Endpoint) => match (req.request, req.value) {
(Request::SET_FEATURE, Request::FEATURE_ENDPOINT_HALT) => {
let ep_addr = ((req.index as u8) & 0x8f).into();
self.bus.set_stalled(ep_addr, true);
self.bus.endpoint_set_stalled(ep_addr, true);
self.control.accept(stage)
}
(Request::CLEAR_FEATURE, Request::FEATURE_ENDPOINT_HALT) => {
let ep_addr = ((req.index as u8) & 0x8f).into();
self.bus.set_stalled(ep_addr, false);
self.bus.endpoint_set_stalled(ep_addr, false);
self.control.accept(stage)
}
_ => self.control.reject(),
},
(_, Recipient::Interface) => {
let handler = self
.interfaces
.iter_mut()
.find(|(i, _)| req.index == *i as _)
.map(|(_, h)| h);
match handler {
Some(handler) => {
let response = match (req.request_type, req.request) {
(RequestType::Standard, Request::SET_INTERFACE) => {
handler.set_interface(req.value)
}
_ => handler.control_out(req, data),
};
match response {
OutResponse::Accepted => self.control.accept(stage),
OutResponse::Rejected => self.control.reject(),
}
}
(RequestType::Class, Recipient::Interface) => {
let iface = match self.interfaces.get_mut(req.index as usize) {
Some(iface) => iface,
None => return self.control.reject(),
};
match &mut iface.handler {
Some(handler) => match handler.control_out(req, data) {
OutResponse::Accepted => self.control.accept(stage),
OutResponse::Rejected => self.control.reject(),
},
None => self.control.reject(),
}
}
@ -406,41 +467,54 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
}
_ => self.control.reject(),
},
(RequestType::Standard, Recipient::Interface) => {
let iface = match self.interfaces.get_mut(req.index as usize) {
Some(iface) => iface,
None => return self.control.reject(),
};
match req.request {
Request::GET_STATUS => {
let status: u16 = 0;
self.control.accept_in(&status.to_le_bytes(), stage).await
}
Request::GET_INTERFACE => {
self.control
.accept_in(&[iface.current_alt_setting], stage)
.await;
}
Request::GET_DESCRIPTOR => match &mut iface.handler {
Some(handler) => match handler.get_descriptor(req, self.control_buf) {
InResponse::Accepted(data) => self.control.accept_in(data, stage).await,
InResponse::Rejected => self.control.reject(),
},
None => self.control.reject(),
},
_ => self.control.reject(),
}
}
(RequestType::Standard, Recipient::Endpoint) => match req.request {
Request::GET_STATUS => {
let ep_addr: EndpointAddress = ((req.index as u8) & 0x8f).into();
let mut status: u16 = 0x0000;
if self.bus.is_stalled(ep_addr) {
if self.bus.endpoint_is_stalled(ep_addr) {
status |= 0x0001;
}
self.control.accept_in(&status.to_le_bytes(), stage).await
}
_ => self.control.reject(),
},
(_, Recipient::Interface) => {
let handler = self
.interfaces
.iter_mut()
.find(|(i, _)| req.index == *i as _)
.map(|(_, h)| h);
(RequestType::Class, Recipient::Interface) => {
let iface = match self.interfaces.get_mut(req.index as usize) {
Some(iface) => iface,
None => return self.control.reject(),
};
match handler {
Some(handler) => {
let response = match (req.request_type, req.request) {
(RequestType::Standard, Request::GET_STATUS) => {
handler.get_status(self.control_buf)
}
(RequestType::Standard, Request::GET_INTERFACE) => {
handler.get_interface(self.control_buf)
}
_ => handler.control_in(req, self.control_buf),
};
match response {
InResponse::Accepted(data) => self.control.accept_in(data, stage).await,
InResponse::Rejected => self.control.reject(),
}
}
match &mut iface.handler {
Some(handler) => match handler.control_in(req, self.control_buf) {
InResponse::Accepted(data) => self.control.accept_in(data, stage).await,
InResponse::Rejected => self.control.reject(),
},
None => self.control.reject(),
}
}

2
embassy-usb/src/types.rs
View File

@ -106,7 +106,7 @@ pub struct EndpointInfo {
/// A handle for a USB interface that contains its number.
#[derive(Copy, Clone, Eq, PartialEq)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub struct InterfaceNumber(u8);
pub struct InterfaceNumber(pub(crate) u8);
impl InterfaceNumber {
pub(crate) fn new(index: u8) -> InterfaceNumber {