add qei trait and implementation

2 files changed, 15 insertions, 0 deletions

diff --git a/embassy-traits/src/lib.rs b/embassy-traits/src/lib.rs
index 10d44d9de..d8b06a091 100644
--- a/embassy-traits/src/lib.rs
+++ b/embassy-traits/src/lib.rs
@@ -9,5 +9,6 @@
 pub mod delay;
 pub mod flash;
 pub mod gpio;
+pub mod qei;
 pub mod i2c;
 pub mod uart;
diff --git a/embassy-traits/src/qei.rs b/embassy-traits/src/qei.rs
new file mode 100644
index 000000000..7e0a8961f
--- /dev/null
+++ b/embassy-traits/src/qei.rs
@@ -0,0 +1,14 @@
+use core::future::Future;
+use core::pin::Pin;
+use embedded_hal::Direction;
+
+// Wait for a specified number of rotations either up or down
+pub trait WaitForRotate {
+    type RotateFuture<'a>: Future<Output = Direction> + 'a;
+
+    fn wait_for_rotate<'a>(
+        self: Pin<&'a mut Self>,
+        count_down: u16,
+        count_up: u16,
+    ) -> Self::RotateFuture<'a>;
+}