Merge pull request #4000 from quarters78/main

Make CDC ACM state constructor `const`

embassy-usb/src/class/cdc_acm.rs

@@ -47,10 +47,10 @@ impl<'a> Default for State<'a> {
 
 impl<'a> State<'a> {
     /// Create a new `State`.
-    pub fn new() -> Self {
+    pub const fn new() -> Self {
         Self {
             control: MaybeUninit::uninit(),
-            shared: ControlShared::default(),
+            shared: ControlShared::new(),
         }
     }
 }
@@ -92,6 +92,12 @@ struct ControlShared {
 
 impl Default for ControlShared {
     fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl ControlShared {
+    const fn new() -> Self {
         ControlShared {
             dtr: AtomicBool::new(false),
             rts: AtomicBool::new(false),
@@ -105,9 +111,7 @@ impl Default for ControlShared {
             changed: AtomicBool::new(false),
         }
     }
-}
 
-impl ControlShared {
     fn changed(&self) -> impl Future<Output = ()> + '_ {
         poll_fn(|cx| {
             if self.changed.load(Ordering::Relaxed) {