From c6513f93fe8198cfcb49adc9d8b61e27090578fc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gabriel=20G=C3=B3rski?= <gabriel.gorski@mobilaris.se>
Date: Wed, 4 Oct 2023 18:20:25 +0200
Subject: [PATCH] stm32/gpio: Implement `eh1::digital::InputPin` for
 `OutputOpenDrain`

Pins in open-drain mode are outputs and inputs simultaneously.
---
 embassy-stm32/src/gpio.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/embassy-stm32/src/gpio.rs b/embassy-stm32/src/gpio.rs
index c709d46da..58d17f12e 100644
--- a/embassy-stm32/src/gpio.rs
+++ b/embassy-stm32/src/gpio.rs
@@ -974,6 +974,18 @@ mod eh1 {
         type Error = Infallible;
     }
 
+    impl<'d, T: Pin> InputPin for OutputOpenDrain<'d, T> {
+        #[inline]
+        fn is_high(&self) -> Result<bool, Self::Error> {
+            Ok(self.is_high())
+        }
+
+        #[inline]
+        fn is_low(&self) -> Result<bool, Self::Error> {
+            Ok(self.is_low())
+        }
+    }
+
     impl<'d, T: Pin> OutputPin for OutputOpenDrain<'d, T> {
         #[inline]
         fn set_high(&mut self) -> Result<(), Self::Error> {