pwm: enable pull-down resistors for pins in Drop implementation

Author: 1-rafael-1

embassy-rp/src/pwm.rs

@@ -464,6 +464,10 @@ impl<'d> Drop for Pwm<'d> {
         pac::PWM.ch(self.slice).csr().write_clear(|w| w.set_en(false));
         if let Some(pin) = &self.pin_a {
             pin.gpio().ctrl().write(|w| w.set_funcsel(31));
+            // Enable pin PULL-DOWN
+            pin.pad_ctrl().modify(|w| {
+                w.set_pde(true);
+            });
         }
         if let Some(pin) = &self.pin_b {
             pin.gpio().ctrl().write(|w| w.set_funcsel(31));
@@ -472,6 +476,10 @@ impl<'d> Drop for Pwm<'d> {
             pin.pad_ctrl().modify(|w| {
                 w.set_ie(false);
             });
+            // Enable pin PULL-DOWN
+            pin.pad_ctrl().modify(|w| {
+                w.set_pde(true);
+            });
         }
     }
 }