Merge pull request #15 from akiles/gpio-wait

RFC: GPIO WaitForFoo traits

embassy/src/gpio.rs

@@ -0,0 +1,48 @@
+use core::future::Future;
+use core::pin::Pin;
+
+/// Wait for a pin to become high.
+pub trait WaitForHigh {
+    type Future<'a>: Future<Output = ()> + 'a;
+
+    /// Wait for a pin to become high.
+    ///
+    /// If the pin is already high, the future completes immediately.
+    /// Otherwise, it completes when it becomes high.
+    fn wait_for_high<'a>(self: Pin<&'a mut Self>) -> Self::Future<'a>;
+}
+
+/// Wait for a pin to become low.
+pub trait WaitForLow {
+    type Future<'a>: Future<Output = ()> + 'a;
+
+    /// Wait for a pin to become low.
+    ///
+    /// If the pin is already low, the future completes immediately.
+    /// Otherwise, it completes when it becomes low.
+    fn wait_for_low<'a>(self: Pin<&'a mut Self>) -> Self::Future<'a>;
+}
+
+/// Wait for a rising edge (transition from low to high)
+pub trait WaitForRisingEdge {
+    type Future<'a>: Future<Output = ()> + 'a;
+
+    /// Wait for a rising edge (transition from low to high)
+    fn wait_for_rising_edge<'a>(self: Pin<&'a mut Self>) -> Self::Future<'a>;
+}
+
+/// Wait for a falling edge (transition from high to low)
+pub trait WaitForFallingEdge {
+    type Future<'a>: Future<Output = ()> + 'a;
+
+    /// Wait for a falling edge (transition from high to low)
+    fn wait_for_falling_edge<'a>(self: Pin<&'a mut Self>) -> Self::Future<'a>;
+}
+
+/// Wait for any edge (any transition, high to low or low to high)
+pub trait WaitForAnyEdge {
+    type Future<'a>: Future<Output = ()> + 'a;
+
+    /// Wait for any edge (any transition, high to low or low to high)
+    fn wait_for_any_edge<'a>(self: Pin<&'a mut Self>) -> Self::Future<'a>;
+}

embassy/src/lib.rs

@@ -8,6 +8,7 @@ pub(crate) mod fmt;
 
 pub mod executor;
 pub mod flash;
+pub mod gpio;
 pub mod interrupt;
 pub mod io;
 pub mod rand;