From 8f0cef3a87efa3306fc24dcc0758cbf555a60acb Mon Sep 17 00:00:00 2001
From: wdfk-prog <1425075683@qq.com>
Date: Thu, 5 Jan 2023 14:25:16 +0800
Subject: [PATCH] =?UTF-8?q?[drivers][serial=5Fv2]=E4=BF=AE=E5=A4=8DDMA+TX?=
 =?UTF-8?q?=E9=98=BB=E5=A1=9E=E6=A8=A1=E5=BC=8F=E5=BC=82=E5=B8=B8=20(#6781?=
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* [drivers][serial_v2]修复DMA+TX阻塞模式异常
---
 components/drivers/serial/serial_v2.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/components/drivers/serial/serial_v2.c b/components/drivers/serial/serial_v2.c
index fc03605c1d..5784f1fee7 100644
--- a/components/drivers/serial/serial_v2.c
+++ b/components/drivers/serial/serial_v2.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2021, RT-Thread Development Team
+ * Copyright (c) 2006-2022, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -694,6 +694,7 @@ static rt_err_t rt_serial_tx_enable(struct rt_device        *dev,
 
         tx_fifo->activated = RT_FALSE;
         tx_fifo->put_size = 0;
+        rt_memset(&tx_fifo->rb, RT_NULL, sizeof(tx_fifo->rb));
         rt_completion_init(&(tx_fifo->tx_cpt));
         dev->open_flag |= RT_SERIAL_TX_BLOCKING;