From e5cda2a34f4acd9bfe2c4b6adc6c5550f40b8892 Mon Sep 17 00:00:00 2001
From: Robin Mueller <muellerr@irs.uni-stuttgart.de>
Date: Wed, 25 Feb 2026 13:25:47 +0100
Subject: [PATCH] another drain check

---
 vorago-shared-hal/src/uart/tx_async.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/vorago-shared-hal/src/uart/tx_async.rs b/vorago-shared-hal/src/uart/tx_async.rs
index 22efc2f..fb53b57 100644
--- a/vorago-shared-hal/src/uart/tx_async.rs
+++ b/vorago-shared-hal/src/uart/tx_async.rs
@@ -262,6 +262,9 @@ impl TxAsync {
     }
 
     pub async fn flush(&mut self) -> Result<(), TxOverrunError> {
+        if tx_is_drained(&self.0) {
+            return Ok(());
+        }
         let fut = TxFlushFuture::new(&mut self.0);
         fut.await
     }