Merge pull request #129 from rust-embedded-community/rs/issue-128/usb-control-transfers

Fixing an issue with windows device enumeration

Author: ryan-summers

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Fixed
+* Fixed a defect where enumeration may fail due to timing-related issues ([#128](https://github.com/rust-embedded-community/usb-device/issues/128))
+
 ### Added
 * New enums and allocators for Isochronous endpoints ([#60](https://github.com/rust-embedded-community/usb-device/pull/60)).
 * Ability to select USB revision ([#116](https://github.com/rust-embedded-community/usb-device/pull/116)).

src/control_pipe.rs

@@ -191,6 +191,11 @@ impl<B: UsbBus> ControlPipe<'_, B> {
                 self.state = ControlState::Idle;
                 return true;
             }
+            ControlState::Idle => {
+                // If we received a message on EP0 while sending the last portion of an IN
+                // transfer, we may have already transitioned to IDLE without getting the last
+                // IN-complete status. Just ignore this indication.
+            }
             _ => {
                 // Unexpected IN packet
                 self.set_error();