Add internal_pull_down() method

For symmetry with internal_pull_up().
stm32-rs · Dec 9, 2021 · 510d135 · 510d135
1 parent d1123d8
commit 510d135
Showing 1 changed file with 26 additions and 0 deletions.
diff --git a/src/gpio.rs b/src/gpio.rs
@@ -309,6 +309,19 @@ impl<const P: char, const N: u8> Pin<Output<OpenDrain>, P, N> {
                 .modify(|r, w| w.bits((r.bits() & !(0b11 << offset)) | (value << offset)))
         };
     }
+
+    /// Enables / disables the internal pull down
+    pub fn internal_pull_down(self, on: bool) -> Self {
+        let offset = 2 * { N };
+        let value = if on { 0b10 } else { 0b00 };
+        unsafe {
+            (*Gpio::<P>::ptr())
+                .pupdr
+                .modify(|r, w| w.bits((r.bits() & !(0b11 << offset)) | (value << offset)))
+        };
+
+        self
+    }
 }
 
 impl<const P: char, const N: u8, const A: u8> Pin<Alternate<PushPull, A>, P, N> {
@@ -337,6 +350,19 @@ impl<const P: char, const N: u8, const A: u8> Pin<Alternate<PushPull, A>, P, N>
 
         self
     }
+
+    /// Enables / disables the internal pull down
+    pub fn internal_pull_down(self, on: bool) -> Self {
+        let offset = 2 * { N };
+        let value = if on { 0b10 } else { 0b00 };
+        unsafe {
+            (*Gpio::<P>::ptr())
+                .pupdr
+                .modify(|r, w| w.bits((r.bits() & !(0b11 << offset)) | (value << offset)))
+        };
+
+        self
+    }
 }
 
 impl<const P: char, const N: u8, const A: u8> Pin<Alternate<PushPull, A>, P, N> {