From e8b03043a51b8a8c19be54dba8ce4081213c5034 Mon Sep 17 00:00:00 2001
From: ryancw <1831931681@qq.com>
Date: Fri, 7 Nov 2025 17:57:56 +0800
Subject: [PATCH] =?UTF-8?q?[=E4=BF=AE=E6=94=B9]=20=E4=B8=BAserial=5Fv2?=
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MIME-Version: 1.0
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---
 .../device/uart/uart_v2/figures/mcfg_dma.jpg  | Bin 15246 -> 0 bytes
 .../device/uart/uart_v2/figures/mcfg_int.jpg  | Bin 14767 -> 0 bytes
 .../uart/uart_v2/figures/mcfg_txdma_intrx.jpg | Bin 14885 -> 0 bytes
 .../uart_v2/figures/mcfg_txpoll_rxint.jpg     | Bin 14433 -> 0 bytes
 .../device/uart/uart_v2/uart.md               | 209 ++++++++++++------
 5 files changed, 140 insertions(+), 69 deletions(-)
 delete mode 100644 rt-thread-version/rt-thread-standard/programming-manual/device/uart/uart_v2/figures/mcfg_dma.jpg
 delete mode 100644 rt-thread-version/rt-thread-standard/programming-manual/device/uart/uart_v2/figures/mcfg_int.jpg
 delete mode 100644 rt-thread-version/rt-thread-standard/programming-manual/device/uart/uart_v2/figures/mcfg_txdma_intrx.jpg
 delete mode 100644 rt-thread-version/rt-thread-standard/programming-manual/device/uart/uart_v2/figures/mcfg_txpoll_rxint.jpg

diff --git a/rt-thread-version/rt-thread-standard/programming-manual/device/uart/uart_v2/figures/mcfg_dma.jpg b/rt-thread-version/rt-thread-standard/programming-manual/device/uart/uart_v2/figures/mcfg_dma.jpg
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diff --git a/rt-thread-version/rt-thread-standard/programming-manual/device/uart/uart_v2/uart.md b/rt-thread-version/rt-thread-standard/programming-manual/device/uart/uart_v2/uart.md
index 418fa79..2e8f2f8 100644
--- a/rt-thread-version/rt-thread-standard/programming-manual/device/uart/uart_v2/uart.md
+++ b/rt-thread-version/rt-thread-standard/programming-manual/device/uart/uart_v2/uart.md
@@ -57,7 +57,7 @@ rt_device_t rt_device_find(const char* name);
 一般情况下，注册到系统的串口设备名称为 uart0，uart1 等，使用示例如下所示：
 
 ```c
-#define SAMPLE_UART_NAME       "uart2"    /* 串口设备名称 */
+#define SAMPLE_UART_NAME       "uart1"    /* 串口设备名称 */
 static rt_device_t serial;                /* 串口设备句柄 */
 /* 查找串口设备 */
 serial = rt_device_find(SAMPLE_UART_NAME);
@@ -105,12 +105,8 @@ rt_device_open(dev, RT_DEVICE_FLAG_RX_NON_BLOCKING | RT_DEVICE_FLAG_TX_BLOCKING)
 > [!NOTE]
 > 注：为了避免 阻塞 / 非阻塞模式  和 轮询 / 中断 / DMA 模式 在文中描述上可能存在的误解，故本文以 应用层操作模式 指代 阻塞 / 非阻塞模式，以 硬件工作模式 指代 轮询 / 中断 / DMA 模式。
 
-而对于流模式 `RT_DEVICE_FLAG_STREAM`，主要是当串口外设作为控制台时才会使用，该模式用来解决用户回车换行的问题，在正常的串口外设通信场景中，该模式一般不会使用。
-
 > [!NOTE]
-> 注：`RT_DEVICE_FLAG_STREAM` 流模式用于向串口终端输出字符串：当输出的字符是 `"\n"` （对应 16 进制值为 0x0A）时，自动在前面输出一个 `"\r"`（对应 16 进制值为 0x0D） 做分行。
-
-流模式 RT_DEVICE_FLAG_STREAM 可以和接收发送模式参数使用或 “|” 运算符一起使用。
+> 注：`RT_DEVICE_FLAG_STREAM` 流模式用于向串口终端输出字符串：当输出的字符是 `"\n"` （对应 16 进制值为 0x0A）时，自动在前面输出一个 `"\r"`（对应 16 进制值为 0x0D） 做分行。在正常的串口外设通信场景中，该模式一般不会使用。
 
 #### 硬件工作模式选择
 
@@ -129,71 +125,94 @@ rt_device_open(dev, RT_DEVICE_FLAG_RX_NON_BLOCKING | RT_DEVICE_FLAG_TX_BLOCKING)
 
 **发送端的模式对应关系如下表所示：**
 
-| 编号 | 配置发送缓冲区（有 / 无）说明                 | 硬件工作模式（TX） | 应用层操作模式（TX） |
+| **硬件工作模式（TX)** | **应用层操作模式（TX）** | 配置发送缓冲区                                | 是否生效 |
 | ---- | --------------------------------------- | ------------------ | -------------------- |
-| (1) | **不使用缓存区，且设置缓存区长度为0**   | 轮询               | 阻塞                 |
-| (2) | 不支持该模式                            | 轮询               | 非阻塞               |
-| (3) | 使用缓存区                              | 中断               | 阻塞                 |
-| (4) | 使用缓存区                              | 中断               | 非阻塞               |
-| (5) | **不使用缓存区，但需要设置缓冲区长度大于0** | DMA                | 阻塞                 |
-| (6) | 使用缓存区                              | DMA                | 非阻塞               |
+| 轮询                  | 阻塞                     | 不使用缓存区，但需要设置**设置缓存区长度为0** | ✔        |
+| 轮询                  | 非阻塞                   | ❌不支持该模式                                 | ❌        |
+| 中断                  | 阻塞                     | 使用缓存区                                    | ✔        |
+| 中断                  | 非阻塞                   | 使用缓存区                                    | ✔        |
+| DMA                   | 阻塞                     | 不使用缓存区，但需要设置**缓冲区长度大于0**   | ✔        |
+| DMA                   | 非阻塞                   | 使用缓存区                                    | ✔        |
 
-对于编号 (1) 模式，如果必须使用轮询模式时，一定要将缓冲区大小配置为 0，因为如果缓冲区大小不为 0，在应用层使用发送阻塞模式时，将会使用中断模式（如果开 DMA，则使用 DMA 模式）。
+当使用 **轮询 阻塞模式发送**时，一定要将**缓冲区大小配置为 0**，因为如果缓冲区大小不为 0，在应用层使用发送阻塞模式时，将会使用中断模式（如果开 DMA，则使用 DMA 模式）。
 
-对于编号 (5) 模式，当用户设置为 DMA 阻塞模式时，虽然设置了缓冲区不为 0，但是该缓冲区并不会进行初始化，而是直接进行 DMA 数据搬运。从而省去了内存搬运造成的性能下降的问题。需要注意的是，当使用 DMA 阻塞模式时，虽然不用缓冲区，但是也要将缓冲区长度设置为大于 0 的值，因为当缓冲区长度为 0 时，将会错误地使用轮询模式。
+当使用 **DMA 阻塞模式发送**时，虽然不用缓冲区，但是也要将**缓冲区长度设置为大于 0** 的值，因为当缓冲区长度为 0 时，将会错误地使用轮询模式。虽然设置了缓冲区不为 0，但是该缓冲区并不会进行初始化占用空间，而是直接进行 DMA 数据搬运。
 
 **接收端的模式对应关系如下表所示：**
 
-| 编号 | 配置接收缓冲区（有 / 无）说明           | 硬件工作模式（RX） | 应用层操作模式（RX） |
+| **硬件工作模式（RX)** | **应用层操作模式（RX）** | 配置发送缓冲区                                | 是否生效 |
 | ---- | ------------------------------------- | ------------------ | -------------------- |
-| (1)  | **不使用缓存区，且设置缓存区长度为0** | 轮询               | 阻塞                 |
-| (2)  | 不支持该模式                          | 轮询               | 非阻塞               |
-| (3)  | 使用缓存区                            | 中断               | 阻塞                 |
-| (4)  | 使用缓存区                            | 中断               | 非阻塞               |
-| (5)  | 使用缓存区                            | DMA                | 阻塞                 |
-| (6)  | 使用缓存区                            | DMA                | 非阻塞               |
+| 轮询                  | 阻塞                     | 不使用缓存区，但需要设置**设置缓存区长度为0** | ✔        |
+| 轮询                  | 非阻塞                   | ❌不支持该模式                                 | ❌        |
+| 中断                  | 阻塞                     | 使用缓存区                                    | ✔        |
+| 中断                  | 非阻塞                   | 使用缓存区                                    | ✔        |
+| DMA                   | 阻塞                     | 不使用缓存区，但需要设置**缓冲区长度大于0**   | ✔        |
+| DMA                   | 非阻塞                   | 使用缓存区                                    | ✔        |
 
-对于编号 (1) 模式，如果必须使用轮询模式时，一定要将缓冲区大小配置为 0，因为如果缓冲区大小不为 0，在应用层使用接收阻塞模式时，将会使用中断模式（如果开 DMA，则使用 DMA 模式）。
+当使用 **轮询 阻塞模式接收**时，一定要将**缓冲区大小配置为 0**，因为如果缓冲区大小不为 0，在应用层使用接收阻塞模式时，将会使用中断模式（如果开 DMA，则使用 DMA 模式）。
 
 下面举例说明如何配置硬件工作模式：
 
-##### 配置发送接收为 DMA 模式
-
 在 menuconfig 中配置效果如下：
 
-![menuconfig](figures/mcfg_dma.jpg)
+##### 配置发送接收为 DMA 模式
 
-上图所示，对于 UART1 的配置为开启 DMA RX 和 DMA TX，且发送和接收缓存区大小设置为 1024 字节。
+```shell
+Enable UART1 --->
+     [*] Enable UART1 RX DMA	(是否使能 RX DMA)
+     [*] Enable UART1 TX DMA	(是否使能 TX DMA)
+     (64)Set UART1 RX DMA ping-pong buffer size	(RX DMA 的乒乓缓冲区)
+     (128)Set UART1 RX buffer size	(rx 缓冲区大小)
+     (128)Set UART1 TX buffer size	(tx 缓冲区大小。TX DMA下无效但必须大于0，请参考上面介绍)
+```
 
+如上所示，对于 UART1 的配置为开启 DMA RX 和 DMA TX，且发送和接收缓存区大小设置为 128 字节
 由此用户在应用层对串口的接收和发送的操作模式进行配置时，无论配置阻塞或者非阻塞，均使用的是 DMA 模式。
 
-##### 配置发送接收为中断模式
 
-在 menuconfig 中配置效果如下：
 
-![menuconfig](figures/mcfg_int.jpg)
+##### 配置发送接收为中断模式
 
-上图所示，对于 UART1 的配置为关闭 DMA RX 和 DMA TX，且发送和接收缓存区大小设置为 1024 字节。
+```shell
+Enable UART1 --->
+     [ ] Enable UART1 RX DMA	(是否使能 RX DMA)
+     [ ] Enable UART1 TX DMA	(是否使能 TX DMA)
+     (128)Set UART1 RX buffer size	(rx 缓冲区大小)
+     (128)Set UART1 TX buffer size	(tx 缓冲区大小。TX DMA下无效但必须大于0，请参考上面介绍)
+```
 
+如上所示，对于 UART1 的配置为开启 INT RX 和 INT TX，且发送和接收缓存区大小设置为 128 字节。
 由此用户在应用层对串口的接收和发送的操作模式进行配置时，无论配置阻塞或者非阻塞，均使用的是中断模式。
 
-##### 配置发送 DMA 模式、接收中断模式
 
-在 menuconfig 中配置效果如下：
 
-![menuconfig](figures/mcfg_txdma_intrx.jpg)
+##### 配置发送 DMA 模式、接收中断模式
+
+```shell
+Enable UART1 --->
+     [ ] Enable UART1 RX DMA	(是否使能 RX DMA)
+     [*] Enable UART1 TX DMA	(是否使能 TX DMA)
+     (128)Set UART1 RX buffer size	(rx 缓冲区大小)
+     (128)Set UART1 TX buffer size	(tx 缓冲区大小。TX DMA下无效但必须大于0，请参考上面介绍)
+```
 
-上图所示，对于 UART1 的配置为关闭 DMA RX 和开启 DMA TX，且发送和接收缓存区大小设置为 1024 字节。
+如上所示，对于 UART1 的配置为开启 INT RX ，开启 DMA TX，且发送和接收缓存区大小设置为 128 字节。
 
 由此用户在应用层对串口的接收和发送的操作模式进行配置时，无论配置阻塞或者非阻塞，均使用的是 DMA 发送模式和中断接收模式。
 
-##### 配置发送轮询模式、接收中断模式（串口控制台默认模式）
 
-在 menuconfig 中配置效果如下：
 
-![menuconfig](figures/mcfg_txpoll_rxint.jpg)
+##### 配置发送轮询模式、接收中断模式（串口控制台默认模式）
 
-上图所示，对于 UART1 的配置为关闭 DMA RX 和 DMA TX，接收缓存区大小设置为 1024 字节，但设置 `UART1 TX buffer size` 为 0。
+```shell
+Enable UART1 --->
+     [ ] Enable UART1 RX DMA	(是否使能 RX DMA)
+     [ ] Enable UART1 TX DMA	(是否使能 TX DMA)
+     (128)Set UART1 RX buffer size	(rx 缓冲区大小)
+     ( 0 )Set UART1 TX buffer size	(tx 缓冲区大小。TX DMA下无效但必须大于0，请参考上面介绍)
+```
+
+如上所示，对于 UART1 的配置为关闭 DMA RX 和 DMA TX，接收缓存区大小设置为 1024 字节，但设置 `UART1 TX buffer size` 为 0。
 
 由此用户在应用层对串口的接收和发送的操作模式进行配置时，发送只能使用阻塞模式，接收可以使用阻塞和非阻塞模式。串口控制台默认使用这样的配置模式，且操作模式为阻塞发送和非阻塞接收。
 
@@ -217,20 +236,55 @@ rt_err_t rt_device_control(rt_device_t dev, rt_uint8_t cmd, void* arg);
 | -RT_ENOSYS | 执行失败，dev 为空                             |
 | 其他错误码 | 执行失败                                       |
 
+指示控制命令 cmd 当前支持的命令包括：
+
+```c
+/* 更新串口配置 */
+#define RT_DEVICE_CTRL_CONFIG /* arg类型: (struct serial_configure *) */
+
+/* 设置接收超时时间。在调用 rt_device_read 之前设置。在轮询模式下不支持 */
+#define RT_SERIAL_CTRL_SET_RX_TIMEOUT /* arg类型: (rt_int32_t *) */
+
+/* 设置发送超时时间。在调用 rt_device_write 之前设置。在轮询模式下不支持 */
+#define RT_SERIAL_CTRL_SET_TX_TIMEOUT /* arg类型: (rt_int32_t *) */
+
+/* 获取接收超时时间。在轮询模式下不支持 */
+#define RT_SERIAL_CTRL_GET_RX_TIMEOUT /* arg类型: (rt_int32_t *) */
+
+/* 获取发送超时时间。在轮询模式下不支持 */
+#define RT_SERIAL_CTRL_GET_TX_TIMEOUT /* arg类型: (rt_int32_t *) */
+
+/* 清空接收缓冲区，丢弃所有数据 */
+#define RT_SERIAL_CTRL_RX_FLUSH /* arg类型: (RT_NULL) */
+
+/* 清空发送缓冲区，阻塞并等待缓冲区数据全部发送完成。在轮询模式下不支持 */
+#define RT_SERIAL_CTRL_TX_FLUSH /* arg类型: (RT_NULL) */
+
+/* 获取未读字节数。在轮询模式下不支持 */
+#define RT_SERIAL_CTRL_GET_UNREAD_BYTES_COUNT /* arg类型: (rt_ssize_t *) */
+
+/* 获取串口配置 */
+#define RT_SERIAL_CTRL_GET_CONFIG /* arg类型: (struct serial_configure *) */
+```
+
 控制参数结构体 struct serial_configure 原型如下：
 
 ```c
 struct serial_configure
 {
-    rt_uint32_t baud_rate;            /* 波特率 */
-    rt_uint32_t data_bits    :4;      /* 数据位 */
-    rt_uint32_t stop_bits    :2;      /* 停止位 */
-    rt_uint32_t parity       :2;      /* 奇偶校验位 */
-    rt_uint32_t bit_order    :1;      /* 高位在前或者低位在前 */
-    rt_uint32_t invert       :1;      /* 模式 */
-    rt_uint32_t rx_bufsz     :16;     /* 接收数据缓冲区大小 */
-    rt_uint32_t tx_bufsz     :16;     /* 发送数据缓冲区大小 */
-    rt_uint32_t reserved     :4;      /* 保留位 */
+    rt_uint32_t baud_rate;            			 /* 波特率 */
+    rt_uint32_t data_bits    			:4;      /* 数据位 */
+    rt_uint32_t stop_bits    			:2;      /* 停止位 */
+    rt_uint32_t parity       			:2;      /* 奇偶校验位 */
+    rt_uint32_t bit_order    			:1;      /* 高位在前或者低位在前 */
+    rt_uint32_t invert       			:1;      /* 模式 */
+    rt_uint32_t rx_bufsz     			:16;     /* 接收数据缓冲区大小 */
+    rt_uint32_t tx_bufsz     			:16;     /* 发送数据缓冲区大小 */
+    rt_uint32_t flowcontrol             :1;		 /* 流控模式 */
+    rt_uint32_t reserved     			:5;      /* 保留位 */
+#ifdef RT_SERIAL_USING_DMA
+    rt_uint32_t dma_ping_bufsz          :16;	 /* rx dma的乒乓缓冲区 */
+#endif
 };
 ```
 
@@ -271,6 +325,9 @@ RT-Thread 提供的配置参数可取值为如下宏定义：
 /* 模式可取值 */
 #define NRZ_NORMAL                      0     /* normal mode */
 #define NRZ_INVERTED                    1     /* inverted mode */
+/* 流控模式 */
+#define RT_SERIAL_FLOWCONTROL_CTSRTS    1	  /* 硬件流控：使用 RTS/CTS 引脚 */
+#define RT_SERIAL_FLOWCONTROL_NONE      0	  /* 无流控 */
 
 #define RT_SERIAL_RX_MINBUFSZ 64        /* 限制接收缓冲区最小长度 */
 #define RT_SERIAL_TX_MINBUFSZ 64        /* 限制发送缓冲区最小长度 */
@@ -280,22 +337,23 @@ RT-Thread 提供的默认串口配置如下，即 RT-Thread 系统中默认每
 
 ```c
 /* Default config for serial_configure structure */
-#define RT_SERIAL_CONFIG_DEFAULT                    \
-{                                                   \
-    BAUD_RATE_115200,       /* 115200 bits/s */     \
-    DATA_BITS_8,            /* 8 databits */        \
-    STOP_BITS_1,            /* 1 stopbit */         \
-    PARITY_NONE,            /* No parity  */        \
-    BIT_ORDER_LSB,          /* LSB first sent */    \
-    NRZ_NORMAL,             /* Normal mode */       \
-    RT_SERIAL_RX_MINBUFSZ,  /* rxBuf size */        \
-    RT_SERIAL_TX_MINBUFSZ,  /* txBuf size */        \
-    0                                               \
+#define RT_SERIAL_CONFIG_DEFAULT                      \
+{                                                     \
+    BAUD_RATE_115200,           /* 115200 bits/s */   \
+    DATA_BITS_8,                /* 8 databits */      \
+    STOP_BITS_1,                /* 1 stopbit */       \
+    PARITY_NONE,                /* No parity  */      \
+    BIT_ORDER_LSB,              /* LSB first sent */  \
+    NRZ_NORMAL,                 /* Normal mode */     \
+    RT_SERIAL_RX_MINBUFSZ,      /* rxBuf size */      \
+    RT_SERIAL_TX_MINBUFSZ,      /* txBuf size */      \
+    RT_SERIAL_FLOWCONTROL_NONE, /* Off flowcontrol */ \
+    0,                          /* reserved */        \
 }
 ```
 
 > [!NOTE]
-> 注：虽然默认串口配置设置了 rx_bufsz 和 tx_bufsz 的大小，但是其缓冲区具体长度会在底层驱动初始化时再次配置，这里无需关心其值。
+> 注：虽然默认串口配置设置了 rx_bufsz 和 tx_bufsz 的大小，但是其缓冲区具体长度会在底层驱动初始化时根据Kconfig再次配置，这里无需关心其值。
 
 若实际使用串口的配置参数与默认配置参数不符，则用户可以通过应用代码进行修改。修改串口配置参数，如波特率、数据位、校验位、缓冲区接收 buffsize、停止位等的示例程序如下：
 
@@ -347,19 +405,20 @@ rt_size_t rt_device_write(rt_device_t dev, rt_off_t pos, const void* buffer, rt_
 #define SAMPLE_UART_NAME       "uart2"    /* 串口设备名称 */
 static rt_device_t serial;                /* 串口设备句柄 */
 char str[] = "hello RT-Thread!\r\n";
-struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT; /* 配置参数 */
+
 /* 查找串口设备 */
 serial = rt_device_find(SAMPLE_UART_NAME);
 
 /* 以非阻塞接收和阻塞发送模式打开串口设备 */
 rt_device_open(serial, RT_DEVICE_FLAG_RX_NON_BLOCKING | RT_DEVICE_FLAG_TX_BLOCKING);
+
 /* 发送字符串 */
 rt_device_write(serial, 0, str, (sizeof(str) - 1));
 ```
 
 ### 设置发送完成回调函数
 
-在应用程序调用 `rt_device_write()` 写入数据时，如果底层硬件能够支持自动发送，那么上层应用可以设置一个回调函数。这个回调函数会在底层硬件数据发送完成后 (例如 DMA 传送完成或 FIFO 已经写入完毕产生完成中断时) 调用。可以通过如下函数设置设备发送完成指示 ：
+在应用程序调用 `rt_device_write()` 写入数据时，如果底层硬件能够支持自动发送，那么上层应用可以设置一个回调函数。这个回调函数会在底层硬件数据发送完成后 (例如 DMA 传送完成或 FIFO 已经写入完毕产生完成中断时) 调用。仅推荐非阻塞模式下使用，可以通过如下函数设置设备发送完成指示 ：
 
 ```c
 rt_err_t rt_device_set_tx_complete(rt_device_t dev, rt_err_t (*tx_done)(rt_device_t dev,void *buffer));
@@ -372,7 +431,7 @@ rt_err_t rt_device_set_tx_complete(rt_device_t dev, rt_err_t (*tx_done)(rt_devic
 | **返回** | ——           |
 | RT_EOK   | 设置成功     |
 
-调用这个函数时，回调函数由调用者提供，当硬件设备发送完数据时，由设备驱动程序回调这个函数并把发送完成的数据块地址 buffer 作为参数传递给上层应用。上层应用（线程）在收到指示时会根据发送 buffer 的情况，释放 buffer 内存块或将其作为下一个写数据的缓存。
+调用这个函数时，回调函数由调用者提供，当硬件设备发送完数据时，由设备驱动程序回调这个函数并把发送完成的数据块地址 buffer (如果存在的话)作为参数传递给上层应用。
 
 ### 设置接收回调函数
 
@@ -501,7 +560,7 @@ rt_err_t rt_device_close(rt_device_t dev);
   RT_DEVICE_FLAG_INT_TX
   RT_DEVICE_FLAG_DMA_RX
   RT_DEVICE_FLAG_DMA_TX
-
+  
   // 新版本 oflags 的参数取值
   RT_DEVICE_FLAG_RX_NON_BLOCKING
   RT_DEVICE_FLAG_RX_BLOCKING
@@ -509,8 +568,13 @@ rt_err_t rt_device_close(rt_device_t dev);
   RT_DEVICE_FLAG_TX_BLOCKING
   ```
 
-  **为了兼容旧版本的框架，使用新版本串口框架时旧版本的应用代码可直接使用，只需注意一点，旧版本的 oflags 参数不再起作用，默认使用新版本的操作模式： 接收非阻塞发送阻塞模式。**
+* V2版本默认 `rt_device_read` 为阻塞读取，如果为了兼容V1框架的应用代码可通过下面方式进行修改。
 
+  ```c
+  rt_int32_t rx_timeout = RT_WAITING_NO;
+  rt_device_control(client->device, RT_SERIAL_CTRL_SET_RX_TIMEOUT, (void *)&rx_timeout);
+  ```
+  
 * 缓冲区宏定义区别
 
   旧版本接收缓冲区统一为 `RT_SERIAL_RB_BUFSZ` ，旧版本没有发送缓冲区的设置。
@@ -534,7 +598,7 @@ rt_err_t rt_device_close(rt_device_t dev);
   struct serial_configure
   {
       rt_uint32_t baud_rate;
-
+  
       rt_uint32_t data_bits               :4;
       rt_uint32_t stop_bits               :2;
       rt_uint32_t parity                  :2;
@@ -543,12 +607,12 @@ rt_err_t rt_device_close(rt_device_t dev);
       rt_uint32_t bufsz                   :16;
       rt_uint32_t reserved                :6;
   };
-
+  
   // 新版本
   struct serial_configure
   {
       rt_uint32_t baud_rate;
-
+  
       rt_uint32_t data_bits               :4;
       rt_uint32_t stop_bits               :2;
       rt_uint32_t parity                  :2;
@@ -556,7 +620,12 @@ rt_err_t rt_device_close(rt_device_t dev);
       rt_uint32_t invert                  :1;
       rt_uint32_t rx_bufsz                :16;
       rt_uint32_t tx_bufsz                :16;
-      rt_uint32_t reserved                :6;
+      rt_uint32_t flowcontrol             :1;
+      rt_uint32_t reserved                :5;
+  
+  #ifdef RT_SERIAL_USING_DMA
+      rt_uint32_t dma_ping_bufsz          :16;
+  #endif
   };
   ```
 
@@ -696,3 +765,5 @@ static int uart_dma_sample(int argc, char *argv[])
 /* 导出到 msh 命令列表中 */
 MSH_CMD_EXPORT(uart_dma_sample, uart device dma sample);
 ```
+
+更多用法可参考 https://github.com/RT-Thread/rt-thread/tree/master/components/drivers/serial/utest/v2 
-- 
Gitee