diff --git a/src/gpio.rs b/src/gpio.rs
index 9268c3dc2..003a1b016 100644
--- a/src/gpio.rs
+++ b/src/gpio.rs
@@ -205,6 +205,32 @@ macro_rules! gpio {
             }
         }
 
+
+        #[cfg(feature = "unproven")]
+        impl<MODE> InputPin for PXx<Output<MODE>> {
+            type Error = Infallible;
+
+            fn is_high(&self) -> Result<bool, Self::Error> {
+                Ok(!self.is_low()?)
+            }
+
+             fn is_low(&self) -> Result<bool, Self::Error> {
+                // NOTE(unsafe) atomic read with no side effects
+                Ok(unsafe {
+                    match &self.gpio {
+                        $(
+                            #[cfg(all(any(
+                                $(feature = $device,)+
+                            ), not(any(
+                                $(feature = $device_except,)*
+                            ))))]
+                            Gpio::$GPIOX => (*$GPIOX::ptr()).idr.read().bits() & (1 << self.i) == 0,
+                        )+
+                    }
+                })
+            }
+        }
+
         #[cfg(feature = "unproven")]
         impl <MODE> StatefulOutputPin for PXx<Output<MODE>> {
             fn is_set_high(&self) -> Result<bool, Self::Error> {
@@ -397,6 +423,20 @@ macro_rules! gpio {
                     }
                 }
 
+                #[cfg(feature = "unproven")]
+                impl<MODE> InputPin for $PXx<Output<MODE>> {
+                    type Error = Infallible;
+
+                    fn is_high(&self) -> Result<bool, Self::Error> {
+                        Ok(!self.is_low()?)
+                    }
+
+                     fn is_low(&self) -> Result<bool, Self::Error> {
+                        // NOTE(unsafe) atomic read with no side effects
+                        Ok(unsafe { (*$GPIOX::ptr()).idr.read().bits() & (1 << self.i) == 0 })
+                    }
+                }
+
                 #[cfg(feature = "unproven")]
                 impl<MODE> InputPin for $PXx<Input<MODE>> {
                     type Error = Infallible;
@@ -673,6 +713,20 @@ macro_rules! gpio {
                         }
                     }
 
+                    #[cfg(feature = "unproven")]
+                    impl<MODE> InputPin for $PXi<Output<MODE>> {
+                        type Error = Infallible;
+
+                        fn is_high(&self) -> Result<bool, Self::Error> {
+                            Ok(!self.is_low()?)
+                        }
+
+                         fn is_low(&self) -> Result<bool, Self::Error> {
+                            // NOTE(unsafe) atomic read with no side effects
+                            Ok(unsafe { (*$GPIOX::ptr()).idr.read().bits() & (1 << $i) == 0 })
+                        }
+                    }
+
                     #[cfg(feature = "unproven")]
                     impl<MODE> InputPin for $PXi<Input<MODE>> {
                         type Error = Infallible;