add more options.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@110 bbd45198-f89e-11dd-88c7-29a3b14d5316

bsp/stm3210/usart.c

@@ -1,338 +1,339 @@
-#include "usart.h"
-#include <serial.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 UART3 with DMA Tx and interrupt Rx -- DMA channel 2
- *
- * USART DMA setting on STM32
- * USART1 Tx --> DMA Channel 4
- * USART1 Rx --> DMA Channel 5
- * USART2 Tx --> DMA Channel 7
- * USART2 Rx --> DMA Channel 6
- * USART3 Tx --> DMA Channel 2
- * USART3 Rx --> DMA Channel 3
- */
-
-#ifdef RT_USING_UART1
-struct stm32_serial_int_rx uart1_int_rx;
-struct stm32_serial_device uart1 = 
-{
-	USART1,
-	&uart1_int_rx,
-	RT_NULL,
-	RT_NULL,
-	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
-};
-struct rt_device uart2_device;
-#endif
-
-#ifdef RT_USING_UART3
-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
-};
-struct rt_device uart3_device;
-#endif
-
-#define USART1_DR_Base  0x40013804
-#define USART2_DR_Base  0x40004404
-#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 RCC_APBPeriph_UART1	RCC_APB2Periph_USART1
-#define UART1_TX_DMA		DMA1_Channel4
-#define UART1_RX_DMA		DMA1_Channel5
-
-/* USART2_REMAP = 0 */
-#define UART2_GPIO_TX		GPIO_Pin_2
-#define UART2_GPIO_RX		GPIO_Pin_3
-#define UART2_GPIO			GPIOA
-#define RCC_APBPeriph_UART2	RCC_APB1Periph_USART2
-#define UART2_TX_DMA		DMA1_Channel7
-#define UART2_RX_DMA		DMA1_Channel6
-
-/* USART3_REMAP[1:0] = 00 */
-#define UART3_GPIO_RX		GPIO_Pin_11
-#define UART3_GPIO_TX		GPIO_Pin_10
-#define UART3_GPIO			GPIOB
-#define RCC_APBPeriph_UART3	RCC_APB1Periph_USART3
-#define UART3_TX_DMA		DMA1_Channel2
-#define UART3_RX_DMA		DMA1_Channel3
-
-static void RCC_Configuration(void)
-{
-	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
-
-#ifdef RT_USING_UART1
-	/* 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);
-#endif
-
-#ifdef RT_USING_UART3
-	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
-	/* Enable USART3 clock */
-	RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
-#endif
-
-#if defined (RT_USING_UART2) || defined (RT_USING_UART3)
-	/* DMA clock enable */
-	RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
-#endif
-}
-
-static void GPIO_Configuration(void)
-{
-	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);
-#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);
-#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);
-#endif
-}
-
-static void NVIC_Configuration(void)
-{
-	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);
-#endif
-
-#ifdef RT_USING_UART2
-	/* Enable the USART2 Interrupt */
-	NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
-	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_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_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);
-#endif
-}
-
-/*
- * Init all related hardware in here
- * rt_hw_serial_init() will register all supported USART device
- */
-void rt_hw_usart_init()
-{
-	USART_InitTypeDef USART_InitStructure;
-	USART_ClockInitTypeDef USART_ClockInitStructure;
-
-	RCC_Configuration();
-	
-	GPIO_Configuration();
-	
-	NVIC_Configuration();
-	
-	DMA_Configuration();
-	
-	/* 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);
-#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);
-#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);
-#endif
-}
+#include "usart.h"
+#include <serial.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 UART3 with DMA Tx and interrupt Rx -- DMA channel 2
+ *
+ * USART DMA setting on STM32
+ * USART1 Tx --> DMA Channel 4
+ * USART1 Rx --> DMA Channel 5
+ * USART2 Tx --> DMA Channel 7
+ * USART2 Rx --> DMA Channel 6
+ * USART3 Tx --> DMA Channel 2
+ * USART3 Rx --> DMA Channel 3
+ */
+
+#ifdef RT_USING_UART1
+struct stm32_serial_int_rx uart1_int_rx;
+struct stm32_serial_device uart1 =
+{
+	USART1,
+	&uart1_int_rx,
+	RT_NULL,
+	RT_NULL,
+	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
+};
+struct rt_device uart2_device;
+#endif
+
+#ifdef RT_USING_UART3
+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
+};
+struct rt_device uart3_device;
+#endif
+
+#define USART1_DR_Base  0x40013804
+#define USART2_DR_Base  0x40004404
+#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 RCC_APBPeriph_UART1	RCC_APB2Periph_USART1
+#define UART1_TX_DMA		DMA1_Channel4
+#define UART1_RX_DMA		DMA1_Channel5
+
+/* USART2_REMAP = 0 */
+#define UART2_GPIO_TX		GPIO_Pin_2
+#define UART2_GPIO_RX		GPIO_Pin_3
+#define UART2_GPIO			GPIOA
+#define RCC_APBPeriph_UART2	RCC_APB1Periph_USART2
+#define UART2_TX_DMA		DMA1_Channel7
+#define UART2_RX_DMA		DMA1_Channel6
+
+/* USART3_REMAP[1:0] = 00 */
+#define UART3_GPIO_RX		GPIO_Pin_11
+#define UART3_GPIO_TX		GPIO_Pin_10
+#define UART3_GPIO			GPIOB
+#define RCC_APBPeriph_UART3	RCC_APB1Periph_USART3
+#define UART3_TX_DMA		DMA1_Channel2
+#define UART3_RX_DMA		DMA1_Channel3
+
+static void RCC_Configuration(void)
+{
+	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
+
+#ifdef RT_USING_UART1
+	/* 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);
+#endif
+
+#ifdef RT_USING_UART3
+	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
+	/* Enable USART3 clock */
+	RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
+#endif
+
+#if defined (RT_USING_UART2) || defined (RT_USING_UART3)
+	/* DMA clock enable */
+	RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
+#endif
+}
+
+static void GPIO_Configuration(void)
+{
+	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);
+#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);
+#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);
+#endif
+}
+
+static void NVIC_Configuration(void)
+{
+	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);
+#endif
+
+#ifdef RT_USING_UART2
+	/* Enable the USART2 Interrupt */
+	NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
+	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_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_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);
+#endif
+}
+
+/*
+ * Init all related hardware in here
+ * rt_hw_serial_init() will register all supported USART device
+ */
+void rt_hw_usart_init()
+{
+	USART_InitTypeDef USART_InitStructure;
+	USART_ClockInitTypeDef USART_ClockInitStructure;
+
+	RCC_Configuration();
+
+	GPIO_Configuration();
+
+	NVIC_Configuration();
+
+	DMA_Configuration();
+
+	/* 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);
+#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);
+#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);
+#endif
+}