extras: add impl_unborrow macro

embassy-extras/src/macros.rs

@@ -84,3 +84,24 @@ macro_rules! unborrow {
         )*
     }
 }
+
+#[macro_export]
+macro_rules! impl_unborrow {
+    ($type:ident) => {
+        impl PeripheralBorrow for $type {
+            type Target = $type;
+            #[inline]
+            unsafe fn unborrow(self) -> Self::Target {
+                self
+            }
+        }
+
+        impl<'a> PeripheralBorrow for &'a mut $type {
+            type Target = $type;
+            #[inline]
+            unsafe fn unborrow(self) -> Self::Target {
+                unsafe { ::core::ptr::read(self) }
+            }
+        }
+    };
+}

embassy-nrf/src/gpio.rs

@@ -3,7 +3,7 @@ use core::hint::unreachable_unchecked;
 use core::marker::PhantomData;
 
 use embassy::util::PeripheralBorrow;
-use embassy_extras::unborrow;
+use embassy_extras::{impl_unborrow, unborrow};
 use embedded_hal::digital::v2::{InputPin, OutputPin, StatefulOutputPin};
 use gpio::pin_cnf::DRIVE_A;
 
@@ -305,6 +305,7 @@ impl AnyPin {
     }
 }
 
+impl_unborrow!(AnyPin);
 impl Pin for AnyPin {}
 impl sealed::Pin for AnyPin {
     #[inline]
@@ -313,24 +314,6 @@ impl sealed::Pin for AnyPin {
     }
 }
 
-impl PeripheralBorrow for AnyPin {
-    type Target = AnyPin;
-    #[inline]
-    unsafe fn unborrow(self) -> Self::Target {
-        self
-    }
-}
-
-impl<'a> PeripheralBorrow for &'a mut AnyPin {
-    type Target = AnyPin;
-    #[inline]
-    unsafe fn unborrow(self) -> Self::Target {
-        AnyPin {
-            pin_port: self.pin_port,
-        }
-    }
-}
-
 // ====================
 
 pub trait OptionalPin: sealed::OptionalPin + Sized {
@@ -379,6 +362,7 @@ impl sealed::Pin for DummyPin {
 
 #[derive(Clone, Copy, Debug)]
 pub struct NoPin;
+impl_unborrow!(NoPin);
 impl sealed::OptionalPin for NoPin {}
 impl OptionalPin for NoPin {
     type Pin = DummyPin;
@@ -394,14 +378,6 @@ impl OptionalPin for NoPin {
     }
 }
 
-impl PeripheralBorrow for NoPin {
-    type Target = NoPin;
-    #[inline]
-    unsafe fn unborrow(self) -> Self::Target {
-        self
-    }
-}
-
 // ====================
 
 macro_rules! make_impl {