diff --git a/embassy-rp/src/gpio.rs b/embassy-rp/src/gpio.rs
index d18fb909..a3d330cd 100644
--- a/embassy-rp/src/gpio.rs
+++ b/embassy-rp/src/gpio.rs
@@ -566,13 +566,13 @@ impl<'d, T: Pin> Flex<'d, T> {
     /// Is the output level high?
     #[inline]
     pub fn is_set_high(&self) -> bool {
-        (self.pin.sio_out().value().read() & self.bit()) == 0
+        !self.is_set_low()
     }
 
     /// Is the output level low?
     #[inline]
     pub fn is_set_low(&self) -> bool {
-        !self.is_set_high()
+        (self.pin.sio_out().value().read() & self.bit()) == 0
     }
 
     /// What level output is set to
diff --git a/tests/rp/src/bin/gpio.rs b/tests/rp/src/bin/gpio.rs
index 51112d31..946b7dc8 100644
--- a/tests/rp/src/bin/gpio.rs
+++ b/tests/rp/src/bin/gpio.rs
@@ -21,14 +21,46 @@ async fn main(_spawner: Spawner) {
         let b = Input::new(&mut b, Pull::None);
 
         {
-            let _a = Output::new(&mut a, Level::Low);
+            let a = Output::new(&mut a, Level::Low);
             delay();
             assert!(b.is_low());
+            assert!(!b.is_high());
+            assert!(a.is_set_low());
+            assert!(!a.is_set_high());
         }
         {
-            let _a = Output::new(&mut a, Level::High);
+            let mut a = Output::new(&mut a, Level::High);
+            delay();
+            assert!(!b.is_low());
+            assert!(b.is_high());
+            assert!(!a.is_set_low());
+            assert!(a.is_set_high());
+
+            // Test is_set_low / is_set_high
+            a.set_low();
+            delay();
+            assert!(b.is_low());
+            assert!(a.is_set_low());
+            assert!(!a.is_set_high());
+
+            a.set_high();
             delay();
             assert!(b.is_high());
+            assert!(!a.is_set_low());
+            assert!(a.is_set_high());
+
+            // Test toggle
+            a.toggle();
+            delay();
+            assert!(b.is_low());
+            assert!(a.is_set_low());
+            assert!(!a.is_set_high());
+
+            a.toggle();
+            delay();
+            assert!(b.is_high());
+            assert!(!a.is_set_low());
+            assert!(a.is_set_high());
         }
     }
 
diff --git a/tests/stm32/src/bin/gpio.rs b/tests/stm32/src/bin/gpio.rs
index 67f44317..aad17443 100644
--- a/tests/stm32/src/bin/gpio.rs
+++ b/tests/stm32/src/bin/gpio.rs
@@ -40,14 +40,46 @@ async fn main(_spawner: Spawner) {
         let b = Input::new(&mut b, Pull::None);
 
         {
-            let _a = Output::new(&mut a, Level::Low, Speed::Low);
+            let a = Output::new(&mut a, Level::Low, Speed::Low);
             delay();
             assert!(b.is_low());
+            assert!(!b.is_high());
+            assert!(a.is_set_low());
+            assert!(!a.is_set_high());
         }
         {
-            let _a = Output::new(&mut a, Level::High, Speed::Low);
+            let mut a = Output::new(&mut a, Level::High, Speed::Low);
+            delay();
+            assert!(!b.is_low());
+            assert!(b.is_high());
+            assert!(!a.is_set_low());
+            assert!(a.is_set_high());
+
+            // Test is_set_low / is_set_high
+            a.set_low();
+            delay();
+            assert!(b.is_low());
+            assert!(a.is_set_low());
+            assert!(!a.is_set_high());
+
+            a.set_high();
             delay();
             assert!(b.is_high());
+            assert!(!a.is_set_low());
+            assert!(a.is_set_high());
+
+            // Test toggle
+            a.toggle();
+            delay();
+            assert!(b.is_low());
+            assert!(a.is_set_low());
+            assert!(!a.is_set_high());
+
+            a.toggle();
+            delay();
+            assert!(b.is_high());
+            assert!(!a.is_set_low());
+            assert!(a.is_set_high());
         }
     }