From 76885ca908319d2f6b587ccd363bffa4f038cbfc Mon Sep 17 00:00:00 2001
From: Meco Man <920369182@qq.com>
Date: Thu, 4 Aug 2022 19:08:28 -0400
Subject: [PATCH] =?UTF-8?q?[stm32][drv=5Fserial]=20=E4=BF=AE=E5=A4=8Drecv?=
 =?UTF-8?q?=5Flen=E6=84=8F=E5=A4=96=E4=B8=BA=E8=B4=9F=EF=BC=88=E5=8D=B3?=
 =?UTF-8?q?=E5=BE=88=E5=A4=A7=E6=AD=A3=E6=95=B0=EF=BC=89=E7=9A=84=E9=97=AE?=
 =?UTF-8?q?=E9=A2=98?=
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https://github.com/RT-Thread/rt-thread/issues/6106
https://github.com/RT-Thread/rt-thread/issues/4467#issuecomment-850814143
---
 bsp/stm32/libraries/HAL_Drivers/drv_usart.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bsp/stm32/libraries/HAL_Drivers/drv_usart.c b/bsp/stm32/libraries/HAL_Drivers/drv_usart.c
index 63644bc719..97de96b22d 100644
--- a/bsp/stm32/libraries/HAL_Drivers/drv_usart.c
+++ b/bsp/stm32/libraries/HAL_Drivers/drv_usart.c
@@ -489,7 +489,7 @@ static void dma_isr(struct rt_serial_device *serial)
         }
         else
         {
-            recv_len = recv_total_index - uart->dma_rx.last_index;
+            recv_len = serial->config.bufsz - uart->dma_rx.last_index + recv_total_index;
         }
         uart->dma_rx.last_index = recv_total_index;
         rt_hw_interrupt_enable(level);