embassy-usb: fix building with optional log feature

1 files changed, 6 insertions, 0 deletions

diff --git a/embassy-usb/src/types.rs b/embassy-usb/src/types.rs
index cb9fe2576..ea6347c7d 100644
--- a/embassy-usb/src/types.rs
+++ b/embassy-usb/src/types.rs
@@ -18,6 +18,12 @@ impl From<InterfaceNumber> for u8 {
     }
 }
 
+impl core::fmt::Display for InterfaceNumber {
+    fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
 /// A handle for a USB string descriptor that contains its index.
 #[derive(Copy, Clone, Eq, PartialEq)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]