Added arch specific mutex implementation

3 files changed, 27 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 5137dce..b1c6114 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,6 +18,7 @@ links = "cortex-m"  # prevent multiple versions of this crate to be linked toget
 [dependencies]
 bare-metal = { version = "0.2.0", features = ["const-fn"] }
 volatile-register = "0.2.0"
+mutex-trait = "0.2.0"
 
 [features]
 cm7-r0p1 = []
diff --git a/src/lib.rs b/src/lib.rs
index f8b5606..5287041 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -62,5 +62,6 @@ pub mod interrupt;
 pub mod itm;
 pub mod peripheral;
 pub mod register;
+pub mod mutex;
 
 pub use crate::peripheral::Peripherals;
diff --git a/src/mutex.rs b/src/mutex.rs
new file mode 100644
index 0000000..7346e35
--- /dev/null
+++ b/src/mutex.rs
@@ -0,0 +1,25 @@
+//! Implementation of a critical section based mutex that also implements the `mutex-trait`.
+
+use core::cell::RefCell;
+
+/// A critical section based mutex
+pub struct CriticalSectionMutex<T> {
+    data: RefCell<T>,
+}
+
+impl<T> CriticalSectionMutex<T> {
+    /// Create a new mutex
+    pub const fn new(data: T) -> Self {
+        CriticalSectionMutex {
+            data: RefCell::new(data),
+        }
+    }
+}
+
+impl<T> mutex_trait::Mutex for &'_ CriticalSectionMutex<T> {
+    type Data = T;
+
+    fn lock<R>(&mut self, f: impl FnOnce(&mut Self::Data) -> R) -> R {
+        crate::interrupt::free(|_| f(&mut *self.data.borrow_mut()))
+    }
+}