From dfba51d3f2a4d6866f6d6de98fde9a620cda20b7 Mon Sep 17 00:00:00 2001
From: lights0123 <developer@lights0123.com>
Date: Sun, 10 Dec 2023 18:39:45 -0500
Subject: [PATCH] stm32: usart pin inversion

---
 embassy-stm32/src/usart/mod.rs | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/embassy-stm32/src/usart/mod.rs b/embassy-stm32/src/usart/mod.rs
index d5828a49..dfa1f3a6 100644
--- a/embassy-stm32/src/usart/mod.rs
+++ b/embassy-stm32/src/usart/mod.rs
@@ -132,6 +132,14 @@ pub struct Config {
     /// Set this to true to swap the RX and TX pins.
     #[cfg(any(usart_v3, usart_v4))]
     pub swap_rx_tx: bool,
+
+    /// Set this to true to invert TX pin signal values (V<sub>DD</sub> =0/mark, Gnd = 1/idle).
+    #[cfg(any(usart_v3, usart_v4))]
+    pub invert_tx: bool,
+
+    /// 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,
 }
 
 impl Default for Config {
@@ -147,6 +155,10 @@ impl Default for Config {
             assume_noise_free: false,
             #[cfg(any(usart_v3, usart_v4))]
             swap_rx_tx: false,
+            #[cfg(any(usart_v3, usart_v4))]
+            invert_tx: false,
+            #[cfg(any(usart_v3, usart_v4))]
+            invert_rx: false,
         }
     }
 }
@@ -972,7 +984,11 @@ fn configure(
         });
 
         #[cfg(any(usart_v3, usart_v4))]
-        w.set_swap(config.swap_rx_tx);
+        {
+            w.set_txinv(config.invert_tx);
+            w.set_rxinv(config.invert_rx);
+            w.set_swap(config.swap_rx_tx);
+        }
     });
 
     #[cfg(not(usart_v1))]