docs and changelog

rtic-sync/CHANGELOG.md

@@ -7,6 +7,10 @@ For each category, _Added_, _Changed_, _Fixed_ add new entries at the top!
 
 ## [Unreleased]
 
+### Fixed
+
+- Const check for `channel::Channel` size smaller than 256 is now properly evaluated.
+
 ### Changed
 
 - Un-hide lifetimes of output type in `Signal::split` to resolve a new warning.

rtic-sync/src/channel.rs

@@ -27,6 +27,8 @@ type WaitQueue = DoublyLinkedList<WaitQueueData>;
 ///
 /// This channel uses critical sections, however there are extremely small and all `memcpy`
 /// operations of `T` are done without critical sections.
+///
+/// Right now, the size of the queue `N` is limited to 255 elements.
 pub struct Channel<T, const N: usize> {
     // Here are all indexes that are not used in `slots` and ready to be allocated.
     freeq: UnsafeCell<Deque<u8, N>>,