remove interrupt Tx and DMA Rx mode in USART.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@559 bbd45198-f89e-11dd-88c7-29a3b14d5316

bsp/stm32_radio/usart.c

+/*
+ * File      : usart.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2009, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2009-01-05     Bernard      the first version
+ * 2010-03-29     Bernard      remove interrupt Tx and DMA Rx mode
+ */
+
 #include "usart.h"
 #include <serial.h>
-
-#include "stm32f10x.h"
+#include <stm32f10x_dma.h>
 
 /*
  * Use UART1 as console output and finsh input
  * interrupt Rx and poll Tx (stream mode)
  *
- * Use UART2 with DMA Rx and poll Tx -- DMA channel 6
+ * Use UART2 with interrupt Rx and poll Tx
  * Use UART3 with DMA Tx and interrupt Rx -- DMA channel 2
  *
  * USART DMA setting on STM32
@@ -23,25 +37,20 @@
 struct stm32_serial_int_rx uart1_int_rx;
 struct stm32_serial_device uart1 =
 {
-    USART1,
-    &uart1_int_rx,
-    RT_NULL,
-    RT_NULL,
-    RT_NULL
+	USART1,
+	&uart1_int_rx,
+	RT_NULL
 };
 struct rt_device uart1_device;
 #endif
 
 #ifdef RT_USING_UART2
 struct stm32_serial_int_rx uart2_int_rx;
-struct stm32_serial_dma_rx uart2_dma_rx;
 struct stm32_serial_device uart2 =
 {
-    USART2,
-    &uart2_int_rx,
-    &uart2_dma_rx,
-    RT_NULL,
-    RT_NULL
+	USART2,
+	&uart2_int_rx,
+	RT_NULL
 };
 struct rt_device uart2_device;
 #endif
@@ -51,11 +60,9 @@ struct stm32_serial_int_rx uart3_int_rx;
 struct stm32_serial_dma_tx uart3_dma_tx;
 struct stm32_serial_device uart3 =
 {
-    USART3,
-    &uart3_int_rx,
-    RT_NULL,
-    RT_NULL,
-    &uart3_dma_tx
+	USART3,
+	&uart3_int_rx,
+	&uart3_dma_tx
 };
 struct rt_device uart3_device;
 #endif
@@ -65,13 +72,19 @@ struct rt_device uart3_device;
 #define USART3_DR_Base  0x40004804
 
 /* USART1_REMAP = 0 */
-#define UART1_GPIO_TX	GPIO_Pin_9
-#define UART1_GPIO_RX	GPIO_Pin_10
-#define UART1_GPIO		GPIOA
+#define UART1_GPIO_TX		GPIO_Pin_9
+#define UART1_GPIO_RX		GPIO_Pin_10
+#define UART1_GPIO			GPIOA
 #define RCC_APBPeriph_UART1	RCC_APB2Periph_USART1
 #define UART1_TX_DMA		DMA1_Channel4
 #define UART1_RX_DMA		DMA1_Channel5
 
+#if defined(STM32F10X_LD) || defined(STM32F10X_MD) || defined(STM32F10X_CL)
+#define UART2_GPIO_TX	    GPIO_Pin_5
+#define UART2_GPIO_RX	    GPIO_Pin_6
+#define UART2_GPIO	    	GPIOD
+#define RCC_APBPeriph_UART2	RCC_APB1Periph_USART2
+#else /* for STM32F10X_HD */
 /* USART2_REMAP = 0 */
 #define UART2_GPIO_TX		GPIO_Pin_2
 #define UART2_GPIO_RX		GPIO_Pin_3
@@ -79,6 +92,7 @@ struct rt_device uart3_device;
 #define RCC_APBPeriph_UART2	RCC_APB1Periph_USART2
 #define UART2_TX_DMA		DMA1_Channel7
 #define UART2_RX_DMA		DMA1_Channel6
+#endif
 
 /* USART3_REMAP[1:0] = 00 */
 #define UART3_GPIO_RX		GPIO_Pin_11
@@ -90,245 +104,237 @@ struct rt_device uart3_device;
 
 static void RCC_Configuration(void)
 {
-    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
+	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
 
 #ifdef RT_USING_UART1
-    /* Enable USART1 and GPIOA clocks */
-    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
+	/* Enable USART1 and GPIOA clocks */
+	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
 #endif
 
 #ifdef RT_USING_UART2
-    /* Enable GPIOD clocks */
-    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);
-    /* Enable USART2 clock */
-    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
+
+#if (defined(STM32F10X_LD) || defined(STM32F10X_MD) || defined(STM32F10X_CL))
+    /* Enable AFIO and GPIOD clock */
+    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOD, ENABLE);
+
+    /* Enable the USART2 Pins Software Remapping */
+    GPIO_PinRemapConfig(GPIO_Remap_USART2, ENABLE);
+#else
+    /* Enable AFIO and GPIOA clock */
+    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOA, ENABLE);
 #endif
 
-#ifdef RT_USING_UART3
-    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
-    /* Enable USART3 clock */
-    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
+	/* Enable USART2 clock */
+	RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
 #endif
 
-#if defined (RT_USING_UART2) || defined (RT_USING_UART3)
-    /* DMA clock enable */
-    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
+#ifdef RT_USING_UART3
+	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
+	/* Enable USART3 clock */
+	RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
+
+	/* DMA clock enable */
+	RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
 #endif
 }
 
 static void GPIO_Configuration(void)
 {
-    GPIO_InitTypeDef GPIO_InitStructure;
+	GPIO_InitTypeDef GPIO_InitStructure;
 
 #ifdef RT_USING_UART1
-    /* Configure USART1 Rx (PA.10) as input floating */
-    GPIO_InitStructure.GPIO_Pin = UART1_GPIO_RX;
-    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
-    GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
-
-    /* Configure USART1 Tx (PA.09) as alternate function push-pull */
-    GPIO_InitStructure.GPIO_Pin = UART1_GPIO_TX;
-    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
-    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
-    GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
+	/* Configure USART1 Rx (PA.10) as input floating */
+	GPIO_InitStructure.GPIO_Pin = UART1_GPIO_RX;
+	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
+	GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
+
+	/* Configure USART1 Tx (PA.09) as alternate function push-pull */
+	GPIO_InitStructure.GPIO_Pin = UART1_GPIO_TX;
+	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
+	GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
 #endif
 
 #ifdef RT_USING_UART2
-    /* Configure USART2 Rx as input floating */
-    GPIO_InitStructure.GPIO_Pin = UART2_GPIO_RX;
-    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
-    GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
-
-    /* Configure USART2 Tx as alternate function push-pull */
-    GPIO_InitStructure.GPIO_Pin = UART2_GPIO_TX;
-    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
-    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
-    GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
+	/* Configure USART2 Rx as input floating */
+	GPIO_InitStructure.GPIO_Pin = UART2_GPIO_RX;
+	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
+	GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
+
+	/* Configure USART2 Tx as alternate function push-pull */
+	GPIO_InitStructure.GPIO_Pin = UART2_GPIO_TX;
+	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
+	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+	GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
 #endif
 
 #ifdef RT_USING_UART3
-    /* Configure USART3 Rx as input floating */
-    GPIO_InitStructure.GPIO_Pin = UART3_GPIO_RX;
-    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
-    GPIO_Init(UART3_GPIO, &GPIO_InitStructure);
-
-    /* Configure USART3 Tx as alternate function push-pull */
-    GPIO_InitStructure.GPIO_Pin = UART3_GPIO_TX;
-    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
-    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
-    GPIO_Init(UART3_GPIO, &GPIO_InitStructure);
+	/* Configure USART3 Rx as input floating */
+	GPIO_InitStructure.GPIO_Pin = UART3_GPIO_RX;
+	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
+	GPIO_Init(UART3_GPIO, &GPIO_InitStructure);
+
+	/* Configure USART3 Tx as alternate function push-pull */
+	GPIO_InitStructure.GPIO_Pin = UART3_GPIO_TX;
+	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
+	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+	GPIO_Init(UART3_GPIO, &GPIO_InitStructure);
 #endif
 }
 
 static void NVIC_Configuration(void)
 {
-    NVIC_InitTypeDef NVIC_InitStructure;
+	NVIC_InitTypeDef NVIC_InitStructure;
+
+	/* Configure the NVIC Preemption Priority Bits */
+	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
 
 #ifdef RT_USING_UART1
-    /* Enable the USART1 Interrupt */
-    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
-    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
-    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
-    NVIC_Init(&NVIC_InitStructure);
+	/* Enable the USART1 Interrupt */
+	NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
+	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
+	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
+	NVIC_Init(&NVIC_InitStructure);
 #endif
 
 #ifdef RT_USING_UART2
-    /* Enable the USART2 Interrupt */
-    NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQChannel;
-    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
-    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
-    NVIC_Init(&NVIC_InitStructure);
-
-    /* Enable the DMA1 Channel6 Interrupt */
-    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel6_IRQChannel;
-    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
-    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
-    NVIC_Init(&NVIC_InitStructure);
+	/* Enable the USART2 Interrupt */
+	NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
+	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
+	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
+	NVIC_Init(&NVIC_InitStructure);
 #endif
 
 #ifdef RT_USING_UART3
-    /* Enable the USART3 Interrupt */
-    NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQChannel;
-    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
-    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
-    NVIC_Init(&NVIC_InitStructure);
-
-    /* Enable the DMA1 Channel2 Interrupt */
-    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel2_IRQChannel;
-    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
-    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
-    NVIC_Init(&NVIC_InitStructure);
+	/* Enable the USART3 Interrupt */
+	NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
+	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
+	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
+	NVIC_Init(&NVIC_InitStructure);
+
+	/* Enable the DMA1 Channel2 Interrupt */
+	NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel2_IRQn;
+	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
+	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
+	NVIC_Init(&NVIC_InitStructure);
 #endif
 }
 
 static void DMA_Configuration(void)
 {
-#if defined(RT_USING_UART2) || defined (RT_USING_UART3)
-    DMA_InitTypeDef DMA_InitStructure;
-
-    /* fill init structure */
-    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
-    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
-    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
-    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
-    DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
-    DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
-    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
-#endif
-
-#ifdef RT_USING_UART2
-    /* DMA1 Channel4 (triggered by USART2 Rx event) Config */
-    DMA_DeInit(UART2_RX_DMA);
-    DMA_InitStructure.DMA_PeripheralBaseAddr = USART2_DR_Base;
-    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
-    DMA_InitStructure.DMA_MemoryBaseAddr = (u32)0;
-    DMA_InitStructure.DMA_BufferSize = 0;
-    DMA_Init(UART2_RX_DMA, &DMA_InitStructure);
-    DMA_ITConfig(UART2_RX_DMA, DMA_IT_TC | DMA_IT_TE, ENABLE);
-    DMA_ClearFlag(DMA1_FLAG_TC4);
-#endif
-
-#ifdef RT_USING_UART3
-    /* DMA1 Channel5 (triggered by USART3 Tx event) Config */
-    DMA_DeInit(UART3_TX_DMA);
-    DMA_InitStructure.DMA_PeripheralBaseAddr = USART3_DR_Base;
-    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
-    DMA_InitStructure.DMA_MemoryBaseAddr = (u32)0;
-    DMA_InitStructure.DMA_BufferSize = 0;
-    DMA_Init(UART3_TX_DMA, &DMA_InitStructure);
-    DMA_ITConfig(UART3_TX_DMA, DMA_IT_TC | DMA_IT_TE, ENABLE);
-    DMA_ClearFlag(DMA1_FLAG_TC5);
+#if defined (RT_USING_UART3)
+	DMA_InitTypeDef DMA_InitStructure;
+
+	/* fill init structure */
+	DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
+	DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
+	DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
+	DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
+	DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
+	DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
+	DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
+
+	/* DMA1 Channel5 (triggered by USART3 Tx event) Config */
+	DMA_DeInit(UART3_TX_DMA);
+	DMA_InitStructure.DMA_PeripheralBaseAddr = USART3_DR_Base;
+	DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
+	DMA_InitStructure.DMA_MemoryBaseAddr = (u32)0;
+	DMA_InitStructure.DMA_BufferSize = 0;
+	DMA_Init(UART3_TX_DMA, &DMA_InitStructure);
+	DMA_ITConfig(UART3_TX_DMA, DMA_IT_TC | DMA_IT_TE, ENABLE);
+	DMA_ClearFlag(DMA1_FLAG_TC5);
 #endif
 }
 
 /*
  * Init all related hardware in here
- * rt_hw_usart_init() will register all supported USART device
+ * rt_hw_serial_init() will register all supported USART device
  */
 void rt_hw_usart_init()
 {
-    USART_InitTypeDef USART_InitStructure;
-    USART_ClockInitTypeDef USART_ClockInitStructure;
+	USART_InitTypeDef USART_InitStructure;
+	USART_ClockInitTypeDef USART_ClockInitStructure;
+
+	RCC_Configuration();
+
+	GPIO_Configuration();
+
+	NVIC_Configuration();
 
-    RCC_Configuration();
-    GPIO_Configuration();
-    NVIC_Configuration();
-    DMA_Configuration();
+	DMA_Configuration();
 
-    /* uart init */
+	/* uart init */
 #ifdef RT_USING_UART1
-    USART_InitStructure.USART_BaudRate = 115200;
-    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
-    USART_InitStructure.USART_StopBits = USART_StopBits_1;
-    USART_InitStructure.USART_Parity = USART_Parity_No;
-    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
-    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
-    USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
-    USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
-    USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
-    USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
-    USART_Init(USART1, &USART_InitStructure);
-    USART_ClockInit(USART1, &USART_ClockInitStructure);
-
-    /* register uart1 */
-    rt_hw_serial_register(&uart1_device, "uart1",
-                          RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
-                          &uart1);
-
-    /* enable interrupt */
-    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
+	USART_InitStructure.USART_BaudRate = 115200;
+	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
+	USART_InitStructure.USART_StopBits = USART_StopBits_1;
+	USART_InitStructure.USART_Parity = USART_Parity_No;
+	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
+	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
+	USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
+	USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
+	USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
+	USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
+	USART_Init(USART1, &USART_InitStructure);
+	USART_ClockInit(USART1, &USART_ClockInitStructure);
+
+	/* register uart1 */
+	rt_hw_serial_register(&uart1_device, "uart1",
+		RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
+		&uart1);
+
+	/* enable interrupt */
+	USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
 #endif
 
 #ifdef RT_USING_UART2
-    USART_InitStructure.USART_BaudRate = 115200;
-    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
-    USART_InitStructure.USART_StopBits = USART_StopBits_1;
-    USART_InitStructure.USART_Parity = USART_Parity_No;
-    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
-    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
-    USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
-    USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
-    USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
-    USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
-    USART_Init(USART2, &USART_InitStructure);
-    USART_ClockInit(USART2, &USART_ClockInitStructure);
-
-    uart2_dma_rx.dma_channel= UART2_RX_DMA;
-
-    /* register uart2 */
-    rt_hw_serial_register(&uart2_device, "uart2",
-                          RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_DMA_RX,
-                          &uart2);
-
-    /* Enable USART2 DMA Rx request */
-    USART_DMACmd(USART2, USART_DMAReq_Rx , ENABLE);
+	USART_InitStructure.USART_BaudRate = 115200;
+	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
+	USART_InitStructure.USART_StopBits = USART_StopBits_1;
+	USART_InitStructure.USART_Parity = USART_Parity_No;
+	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
+	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
+	USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
+	USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
+	USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
+	USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
+	USART_Init(USART2, &USART_InitStructure);
+	USART_ClockInit(USART2, &USART_ClockInitStructure);
+
+	/* register uart2 */
+	rt_hw_serial_register(&uart2_device, "uart2",
+		RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
+		&uart2);
+
+	/* Enable USART2 DMA Rx request */
+	USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
 #endif
 
 #ifdef RT_USING_UART3
-    USART_InitStructure.USART_BaudRate = 115200;
-    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
-    USART_InitStructure.USART_StopBits = USART_StopBits_1;
-    USART_InitStructure.USART_Parity = USART_Parity_No;
-    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
-    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
-    USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
-    USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
-    USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
-    USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
-    USART_Init(USART3, &USART_InitStructure);
-    USART_ClockInit(USART3, &USART_ClockInitStructure);
-
-    uart3_dma_tx.dma_channel= UART3_TX_DMA;
-
-    /* register uart3 */
-    rt_hw_serial_register(&uart3_device, "uart3",
-                          RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_DMA_TX,
-                          &uart3);
-
-    /* Enable USART3 DMA Tx request */
-    USART_DMACmd(USART3, USART_DMAReq_Tx , ENABLE);
-
-    /* enable interrupt */
-    USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
+	USART_InitStructure.USART_BaudRate = 115200;
+	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
+	USART_InitStructure.USART_StopBits = USART_StopBits_1;
+	USART_InitStructure.USART_Parity = USART_Parity_No;
+	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
+	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
+	USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
+	USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
+	USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
+	USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
+	USART_Init(USART3, &USART_InitStructure);
+	USART_ClockInit(USART3, &USART_ClockInitStructure);
+
+	uart3_dma_tx.dma_channel= UART3_TX_DMA;
+
+	/* register uart3 */
+	rt_hw_serial_register(&uart3_device, "uart3",
+		RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_DMA_TX,
+		&uart3);
+
+	/* Enable USART3 DMA Tx request */
+	USART_DMACmd(USART3, USART_DMAReq_Tx , ENABLE);
+
+	/* enable interrupt */
+	USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
 #endif
 }