From 9c6d8d96ce57ea1387a621e7245ad0a99be7c5ed Mon Sep 17 00:00:00 2001
From: ItsGettingWorse <66210756+ItsGettingWorse@users.noreply.github.com>
Date: Fri, 21 Oct 2022 13:07:40 +0800
Subject: [PATCH] Update drv_usart.c
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修复RX DMA 第一包收不到的bug
---
 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 d3f7561d32..6ca3cf43db 100644
--- a/bsp/stm32/libraries/HAL_Drivers/drv_usart.c
+++ b/bsp/stm32/libraries/HAL_Drivers/drv_usart.c
@@ -170,7 +170,7 @@ static rt_err_t stm32_configure(struct rt_serial_device *serial, struct serial_c
 
 #ifdef RT_SERIAL_USING_DMA
     if (!(serial->parent.open_flag & RT_DEVICE_OFLAG_OPEN)) {
-        uart->dma_rx.remaining_cnt = 0;
+        uart->dma_rx.remaining_cnt = cfg->bufsz;
     }
 #endif