diff --git a/embassy-stm32/src/usart/mod.rs b/embassy-stm32/src/usart/mod.rs
index 8a0c85d2..9e1128e3 100644
--- a/embassy-stm32/src/usart/mod.rs
+++ b/embassy-stm32/src/usart/mod.rs
@@ -161,6 +161,10 @@ pub struct Config {
     /// Set this to true to invert RX pin signal values (V<sub>DD</sub> =0/mark, Gnd = 1/idle).
     #[cfg(any(usart_v3, usart_v4))]
     pub invert_rx: bool,
+
+    /// enable single wire half duplex communication. Only the tx pin is used. Needs an external
+    /// pull up
+    pub half_duplex: bool,
 }
 
 impl Default for Config {
@@ -180,6 +184,7 @@ impl Default for Config {
             invert_tx: false,
             #[cfg(any(usart_v3, usart_v4))]
             invert_rx: false,
+            half_duplex: false,
         }
     }
 }
@@ -811,19 +816,27 @@ impl<'d, T: BasicInstance, TxDma, RxDma> Uart<'d, T, TxDma, RxDma> {
         let r = T::regs();
 
         // Some chips do not have swap_rx_tx bit
-        cfg_if::cfg_if! {
-            if #[cfg(any(usart_v3, usart_v4))] {
-                if config.swap_rx_tx {
-                    let (rx, tx) = (tx, rx);
-                    rx.set_as_af(rx.af_num(), AFType::Input);
-                    tx.set_as_af(tx.af_num(), AFType::OutputPushPull);
+        if config.half_duplex {
+            if config.swap_rx_tx {
+                rx.set_as_af(rx.af_num(), AFType::OutputOpenDrain);
+            } else {
+                tx.set_as_af(tx.af_num(), AFType::OutputOpenDrain);
+            }
+        } else {
+            cfg_if::cfg_if! {
+                if #[cfg(any(usart_v3, usart_v4))] {
+                    if config.swap_rx_tx {
+                        let (rx, tx) = (tx, rx);
+                        rx.set_as_af(rx.af_num(), AFType::Input);
+                        tx.set_as_af(tx.af_num(), AFType::OutputPushPull);
+                    } else {
+                        rx.set_as_af(rx.af_num(), AFType::Input);
+                        tx.set_as_af(tx.af_num(), AFType::OutputPushPull);
+                    }
                 } else {
                     rx.set_as_af(rx.af_num(), AFType::Input);
                     tx.set_as_af(tx.af_num(), AFType::OutputPushPull);
                 }
-            } else {
-                rx.set_as_af(rx.af_num(), AFType::Input);
-                tx.set_as_af(tx.af_num(), AFType::OutputPushPull);
             }
         }
 
@@ -1039,6 +1052,7 @@ fn configure(
     #[cfg(not(usart_v1))]
     r.cr3().modify(|w| {
         w.set_onebit(config.assume_noise_free);
+        w.set_hdsel(config.half_duplex);
     });
 
     r.cr1().write(|w| {