Impl drop for embassy-rp gpio Output

This commit implements drop for embassy-rp gpio Output which is
currently a todo.

1 files changed, 8 insertions, 1 deletions

diff --git a/embassy-rp/src/gpio.rs b/embassy-rp/src/gpio.rs
index 28dfce476..68995b78f 100644
--- a/embassy-rp/src/gpio.rs
+++ b/embassy-rp/src/gpio.rs
@@ -135,7 +135,14 @@ impl<'d, T: Pin> Output<'d, T> {
 
 impl<'d, T: Pin> Drop for Output<'d, T> {
     fn drop(&mut self) {
-        // todo
+        let val = 1 << self.pin.pin();
+        unsafe {
+            self.pin.sio_out().value_clr().write_value(val);
+            self.pin.sio_oe().value_clr().write_value(val);
+            self.pin.io().ctrl().write(|w| {
+                w.set_funcsel(pac::io::vals::Gpio0CtrlFuncsel::NULL.0);
+            });
+        };
     }
 }