diff --git a/Cargo.toml b/Cargo.toml
index 8645f17..4274e6b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,7 +11,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.3.6"
+version = "0.3.7"
 edition = "2021"
 repository = "https://git.bfpower.io/BFPOWER/physical"
 readme = "README.md"
diff --git a/node/src/stm32/usb.rs b/node/src/stm32/usb.rs
index d2f767f..aab470a 100644
--- a/node/src/stm32/usb.rs
+++ b/node/src/stm32/usb.rs
@@ -11,6 +11,13 @@ pub type TypedUSB = UsbDevice<'static, Driver<'static, USB_OTG_FS>>;
 pub type TypedInterIn = Endpoint<'static, USB_OTG_FS, In>;
 pub type TypedInterOut = Endpoint<'static, USB_OTG_FS, Out>;
 
+pub struct UsbIO {
+    /// Send to master
+    interrupt_in: TypedInterIn,
+    /// Recieve from master
+    interrupt_out: TypedInterOut,
+}
+
 impl comms::Sender for TypedInterIn {
     async fn send(&mut self, msg: &[u8]) -> Result<(), comms::Reset> {
         self.write(msg).await.map_err(|_| comms::Reset)
@@ -26,9 +33,9 @@ impl comms::Receiver for TypedInterOut {
             .map(|_| ())
             .map_err(|_| comms::Reset)
     }
-    
+
     #[cfg(not(feature = "single-packet-msgs"))]
-    async fn receive(&mut self, buffer: &mut [u8]) -> Result<(), comms::Reset> { 
+    async fn receive(&mut self, buffer: &mut [u8]) -> Result<(), comms::Reset> {
         todo!("Decide if we want a general purpose multi-packet message receive")
     }
 }