From ebdf8b6b1a04f0f211c5d3fd2c73f2d902485105 Mon Sep 17 00:00:00 2001
From: randellhodges <rhodges@taxfodder.com>
Date: Sun, 22 Dec 2019 03:08:17 -0600
Subject: [PATCH] Fix STM32 flush of TX (used by UBL) (#16197)

---
 Marlin/src/core/serial.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Marlin/src/core/serial.h b/Marlin/src/core/serial.h
index c2745e972b..bdf3ba4686 100644
--- a/Marlin/src/core/serial.h
+++ b/Marlin/src/core/serial.h
@@ -75,7 +75,7 @@ extern uint8_t marlin_debug_flags;
 #define SERIAL_PRINTF(V...)     SERIAL_OUT(printf, V)
 #define SERIAL_FLUSH()          SERIAL_OUT(flush)
 
-#ifdef __STM32F1__
+#ifdef ARDUINO_ARCH_STM32
   #define SERIAL_FLUSHTX()      SERIAL_OUT(flush)
 #elif TX_BUFFER_SIZE > 0
   #define SERIAL_FLUSHTX()      SERIAL_OUT(flushTX)
-- 
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