Provide v2_compat for ToggleableOutputPin

fixes #137

Author: little-arhat

src/digital/v2_compat.rs

@@ -39,6 +39,9 @@ where
      }
 }
 
+#[cfg(feature = "unproven")]
+#[allow(deprecated)]
+impl<T> v2::toggleable::Default for T where T: v1::toggleable::Default {}
 
 /// Implementation of fallible `v2::InputPin` for `v1::InputPin` digital traits
 #[cfg(feature = "unproven")]
@@ -81,6 +84,20 @@ mod tests {
         }
     }
 
+    #[allow(deprecated)]
+    impl v1::StatefulOutputPin for OldOutputPinImpl {
+        fn is_set_low(&self) -> bool {
+            self.state == false
+        }
+
+        fn is_set_high(&self) -> bool {
+            self.state == true
+        }
+    }
+
+    #[allow(deprecated)]
+    impl v1::toggleable::Default for OldOutputPinImpl {}
+
     struct NewOutputPinConsumer<T: v2::OutputPin> {
         _pin: T,
     }
@@ -92,6 +109,25 @@ mod tests {
         }
     }
 
+    struct NewToggleablePinConsumer<T: v2::ToggleableOutputPin> {
+        _pin: T,
+    }
+
+    impl<T> NewToggleablePinConsumer<T>
+    where
+        T: v2::ToggleableOutputPin,
+    {
+        pub fn new(pin: T) -> NewToggleablePinConsumer<T> {
+            NewToggleablePinConsumer { _pin: pin }
+        }
+    }
+
+    #[test]
+    fn v2_v1_toggleable_implicit() {
+        let i = OldOutputPinImpl { state: false };
+        let _c = NewToggleablePinConsumer::new(i);
+    }
+
     #[test]
     fn v2_v1_output_implicit() {
         let i = OldOutputPinImpl{state: false};