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usb: builtin handling of interface alternate settings

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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
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23
embassy-usb/src/builder.rs
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@ -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,