Merge pull request #272 from wzyy2/master

[bsp/stm32f40x] code style change

4 files changed, 481 insertions, 481 deletions

diff --git a/bsp/stm32f40x/applications/startup.c b/bsp/stm32f40x/applications/startup.c
index 991908cac4..d5d31fa5e1 100644
--- a/bsp/stm32f40x/applications/startup.c
+++ b/bsp/stm32f40x/applications/startup.c
@@ -53,11 +53,11 @@ extern int __bss_end;
 *******************************************************************************/
 void assert_failed(u8* file, u32 line)
 {
-	rt_kprintf("\n\r Wrong parameter value detected on\r\n");
-	rt_kprintf("       file  %s\r\n", file);
-	rt_kprintf("       line  %d\r\n", line);
+    rt_kprintf("\n\r Wrong parameter value detected on\r\n");
+    rt_kprintf("       file  %s\r\n", file);
+    rt_kprintf("       line  %d\r\n", line);
 
-	while (1) ;
+    while (1) ;
 }
 
 /**
@@ -65,60 +65,60 @@ void assert_failed(u8* file, u32 line)
  */
 void rtthread_startup(void)
 {
-	/* init board */
-	rt_hw_board_init();
+    /* init board */
+    rt_hw_board_init();
 
-	/* show version */
-	rt_show_version();
+    /* show version */
+    rt_show_version();
 
-	/* init tick */
-	rt_system_tick_init();
+    /* init tick */
+    rt_system_tick_init();
 
-	/* init kernel object */
-	rt_system_object_init();
+    /* init kernel object */
+    rt_system_object_init();
 
-	/* init timer system */
-	rt_system_timer_init();
+    /* init timer system */
+    rt_system_timer_init();
 
     rt_system_heap_init((void*)STM32_SRAM_BEGIN, (void*)STM32_SRAM_END);
 
-	/* init scheduler system */
-	rt_system_scheduler_init();
+    /* init scheduler system */
+    rt_system_scheduler_init();
 
-	/* init all device */
-	rt_device_init_all();
+    /* init all device */
+    rt_device_init_all();
 
-	/* init application */
-	rt_application_init();
+    /* init application */
+    rt_application_init();
 
 #ifdef RT_USING_FINSH
-	/* init finsh */
-	finsh_system_init();
-	finsh_set_device( FINSH_DEVICE_NAME );
+    /* init finsh */
+    finsh_system_init();
+    finsh_set_device( FINSH_DEVICE_NAME );
 #endif
 
     /* init timer thread */
     rt_system_timer_thread_init();
 
-	/* init idle thread */
-	rt_thread_idle_init();
+    /* init idle thread */
+    rt_thread_idle_init();
 
-	/* start scheduler */
-	rt_system_scheduler_start();
+    /* start scheduler */
+    rt_system_scheduler_start();
 
-	/* never reach here */
-	return ;
+    /* never reach here */
+    return ;
 }
 
 int main(void)
 {
-	/* disable interrupt first */
-	rt_hw_interrupt_disable();
+    /* disable interrupt first */
+    rt_hw_interrupt_disable();
 
-	/* startup RT-Thread RTOS */
-	rtthread_startup();
+    /* startup RT-Thread RTOS */
+    rtthread_startup();
 
-	return 0;
+    return 0;
 }
 
 /*@}*/
diff --git a/bsp/stm32f40x/drivers/board.c b/bsp/stm32f40x/drivers/board.c
index a0fa9312e7..0414916a5a 100644
--- a/bsp/stm32f40x/drivers/board.c
+++ b/bsp/stm32f40x/drivers/board.c
@@ -34,11 +34,11 @@
 void NVIC_Configuration(void)
 {
 #ifdef  VECT_TAB_RAM
-	/* Set the Vector Table base location at 0x20000000 */
-	NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
+    /* Set the Vector Table base location at 0x20000000 */
+    NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
 #else  /* VECT_TAB_FLASH  */
-	/* Set the Vector Table base location at 0x08000000 */
-	NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
+    /* Set the Vector Table base location at 0x08000000 */
+    NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
 #endif
 
     NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
@@ -53,16 +53,16 @@ void NVIC_Configuration(void)
  *******************************************************************************/
 void  SysTick_Configuration(void)
 {
-	RCC_ClocksTypeDef  rcc_clocks;
-	rt_uint32_t         cnts;
+    RCC_ClocksTypeDef  rcc_clocks;
+    rt_uint32_t         cnts;
 
-	RCC_GetClocksFreq(&rcc_clocks);
+    RCC_GetClocksFreq(&rcc_clocks);
 
-	cnts = (rt_uint32_t)rcc_clocks.HCLK_Frequency / RT_TICK_PER_SECOND;
-	cnts = cnts / 8;
+    cnts = (rt_uint32_t)rcc_clocks.HCLK_Frequency / RT_TICK_PER_SECOND;
+    cnts = cnts / 8;
 
-	SysTick_Config(cnts);
-	SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);
+    SysTick_Config(cnts);
+    SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);
 }
 
 /**
@@ -71,13 +71,13 @@ void  SysTick_Configuration(void)
  */
 void SysTick_Handler(void)
 {
-	/* enter interrupt */
-	rt_interrupt_enter();
+    /* enter interrupt */
+    rt_interrupt_enter();
 
-	rt_tick_increase();
+    rt_tick_increase();
 
-	/* leave interrupt */
-	rt_interrupt_leave();
+    /* leave interrupt */
+    rt_interrupt_leave();
 }
 
 /**
@@ -85,15 +85,15 @@ void SysTick_Handler(void)
  */
 void rt_hw_board_init()
 {
-	/* NVIC Configuration */
-	NVIC_Configuration();
+    /* NVIC Configuration */
+    NVIC_Configuration();
 
-	/* Configure the SysTick */
-	SysTick_Configuration();
+    /* Configure the SysTick */
+    SysTick_Configuration();
 
-	rt_hw_usart_init();
+    rt_hw_usart_init();
 #ifdef RT_USING_CONSOLE
-	rt_console_set_device(CONSOLE_DEVICE);
+    rt_console_set_device(CONSOLE_DEVICE);
 #endif
 }
 
diff --git a/bsp/stm32f40x/drivers/serial.c b/bsp/stm32f40x/drivers/serial.c
index 041439bdab..2ec3f8ec2d 100644
--- a/bsp/stm32f40x/drivers/serial.c
+++ b/bsp/stm32f40x/drivers/serial.c
@@ -20,7 +20,7 @@
 #include <stm32f4xx_usart.h>
 
 static void rt_serial_enable_dma(DMA_Stream_TypeDef* dma_channel,
-	rt_uint32_t address, rt_uint32_t size);
+    rt_uint32_t address, rt_uint32_t size);
 
 /**
  * @addtogroup STM32
@@ -30,252 +30,252 @@ static void rt_serial_enable_dma(DMA_Stream_TypeDef* dma_channel,
 /* RT-Thread Device Interface */
 static rt_err_t rt_serial_init (rt_device_t dev)
 {
-	struct stm32_serial_device* uart = (struct stm32_serial_device*) dev->user_data;
+    struct stm32_serial_device* uart = (struct stm32_serial_device*) dev->user_data;
 
-	if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))
-	{
-		if (dev->flag & RT_DEVICE_FLAG_INT_RX)
-		{
-			rt_memset(uart->int_rx->rx_buffer, 0,
-				sizeof(uart->int_rx->rx_buffer));
-			uart->int_rx->read_index = 0;
-			uart->int_rx->save_index = 0;
-		}
+    if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))
+    {
+        if (dev->flag & RT_DEVICE_FLAG_INT_RX)
+        {
+            rt_memset(uart->int_rx->rx_buffer, 0,
+                sizeof(uart->int_rx->rx_buffer));
+            uart->int_rx->read_index = 0;
+            uart->int_rx->save_index = 0;
+        }
 
-		if (dev->flag & RT_DEVICE_FLAG_DMA_TX)
-		{
-			RT_ASSERT(uart->dma_tx->dma_channel != RT_NULL);
-			uart->dma_tx->list_head = uart->dma_tx->list_tail = RT_NULL;
+        if (dev->flag & RT_DEVICE_FLAG_DMA_TX)
+        {
+            RT_ASSERT(uart->dma_tx->dma_channel != RT_NULL);
+            uart->dma_tx->list_head = uart->dma_tx->list_tail = RT_NULL;
 
-			/* init data node memory pool */
-			rt_mp_init(&(uart->dma_tx->data_node_mp), "dn",
-				uart->dma_tx->data_node_mem_pool,
-				sizeof(uart->dma_tx->data_node_mem_pool),
-				sizeof(struct stm32_serial_data_node));
-		}
+            /* init data node memory pool */
+            rt_mp_init(&(uart->dma_tx->data_node_mp), "dn",
+                uart->dma_tx->data_node_mem_pool,
+                sizeof(uart->dma_tx->data_node_mem_pool),
+                sizeof(struct stm32_serial_data_node));
+        }
 
-		/* Enable USART */
-		USART_Cmd(uart->uart_device, ENABLE);
+        /* Enable USART */
+        USART_Cmd(uart->uart_device, ENABLE);
 
-		dev->flag |= RT_DEVICE_FLAG_ACTIVATED;
-	}
+        dev->flag |= RT_DEVICE_FLAG_ACTIVATED;
+    }
 
-	return RT_EOK;
+    return RT_EOK;
 }
 
 static rt_err_t rt_serial_open(rt_device_t dev, rt_uint16_t oflag)
 {
-	return RT_EOK;
+    return RT_EOK;
 }
 
 static rt_err_t rt_serial_close(rt_device_t dev)
 {
-	return RT_EOK;
+    return RT_EOK;
 }
 
 static rt_size_t rt_serial_read (rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
 {
-	rt_uint8_t* ptr;
-	rt_err_t err_code;
-	struct stm32_serial_device* uart;
+    rt_uint8_t* ptr;
+    rt_err_t err_code;
+    struct stm32_serial_device* uart;
 
-	ptr = buffer;
-	err_code = RT_EOK;
-	uart = (struct stm32_serial_device*)dev->user_data;
+    ptr = buffer;
+    err_code = RT_EOK;
+    uart = (struct stm32_serial_device*)dev->user_data;
 
-	if (dev->flag & RT_DEVICE_FLAG_INT_RX)
-	{
-		/* interrupt mode Rx */
-		while (size)
-		{
-			rt_base_t level;
+    if (dev->flag & RT_DEVICE_FLAG_INT_RX)
+    {
+        /* interrupt mode Rx */
+        while (size)
+        {
+            rt_base_t level;
 
-			/* disable interrupt */
-			level = rt_hw_interrupt_disable();
+            /* disable interrupt */
+            level = rt_hw_interrupt_disable();
 
-			if (uart->int_rx->read_index != uart->int_rx->save_index)
-			{
-				/* read a character */
-				*ptr++ = uart->int_rx->rx_buffer[uart->int_rx->read_index];
-				size--;
+            if (uart->int_rx->read_index != uart->int_rx->save_index)
+            {
+                /* read a character */
+                *ptr++ = uart->int_rx->rx_buffer[uart->int_rx->read_index];
+                size--;
 
-				/* move to next position */
-				uart->int_rx->read_index ++;
-				if (uart->int_rx->read_index >= UART_RX_BUFFER_SIZE)
-					uart->int_rx->read_index = 0;
-			}
-			else
-			{
-				/* set error code */
-				err_code = -RT_EEMPTY;
+                /* move to next position */
+                uart->int_rx->read_index ++;
+                if (uart->int_rx->read_index >= UART_RX_BUFFER_SIZE)
+                    uart->int_rx->read_index = 0;
+            }
+            else
+            {
+                /* set error code */
+                err_code = -RT_EEMPTY;
 
-				/* enable interrupt */
-				rt_hw_interrupt_enable(level);
-				break;
-			}
+                /* enable interrupt */
+                rt_hw_interrupt_enable(level);
+                break;
+            }
 
-			/* enable interrupt */
-			rt_hw_interrupt_enable(level);
-		}
-	}
-	else
-	{
-		/* polling mode */
-		while ((rt_uint32_t)ptr - (rt_uint32_t)buffer < size)
-		{
-			while (uart->uart_device->SR & USART_FLAG_RXNE)
-			{
-				*ptr = uart->uart_device->DR & 0xff;
-				ptr ++;
-			}
-		}
-	}
+            /* enable interrupt */
+            rt_hw_interrupt_enable(level);
+        }
+    }
+    else
+    {
+        /* polling mode */
+        while ((rt_uint32_t)ptr - (rt_uint32_t)buffer < size)
+        {
+            while (uart->uart_device->SR & USART_FLAG_RXNE)
+            {
+                *ptr = uart->uart_device->DR & 0xff;
+                ptr ++;
+            }
+        }
+    }
 
-	/* set error code */
-	rt_set_errno(err_code);
-	return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
+    /* set error code */
+    rt_set_errno(err_code);
+    return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
 }
 
 static void rt_serial_enable_dma(DMA_Stream_TypeDef* dma_channel,
-	rt_uint32_t address, rt_uint32_t size)
+    rt_uint32_t address, rt_uint32_t size)
 {
-	RT_ASSERT(dma_channel != RT_NULL);
+    RT_ASSERT(dma_channel != RT_NULL);
 
-	/* disable DMA */
-	DMA_Cmd(dma_channel, DISABLE);
+    /* disable DMA */
+    DMA_Cmd(dma_channel, DISABLE);
 
-	/* set buffer address */
-	dma_channel->M0AR = address;
-	/* set size */
-	dma_channel->NDTR = size;
+    /* set buffer address */
+    dma_channel->M0AR = address;
+    /* set size */
+    dma_channel->NDTR = size;
 
-	/* enable DMA */
-	DMA_Cmd(dma_channel, ENABLE);
+    /* enable DMA */
+    DMA_Cmd(dma_channel, ENABLE);
 }
 
 static rt_size_t rt_serial_write (rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
 {
-	rt_uint8_t* ptr;
-	rt_err_t err_code;
-	struct stm32_serial_device* uart;
+    rt_uint8_t* ptr;
+    rt_err_t err_code;
+    struct stm32_serial_device* uart;
 
-	err_code = RT_EOK;
-	ptr = (rt_uint8_t*)buffer;
-	uart = (struct stm32_serial_device*)dev->user_data;
+    err_code = RT_EOK;
+    ptr = (rt_uint8_t*)buffer;
+    uart = (struct stm32_serial_device*)dev->user_data;
 
-	if (dev->flag & RT_DEVICE_FLAG_INT_TX)
-	{
-		/* interrupt mode Tx, does not support */
-		RT_ASSERT(0);
-	}
-	else if (dev->flag & RT_DEVICE_FLAG_DMA_TX)
-	{
-		/* DMA mode Tx */
+    if (dev->flag & RT_DEVICE_FLAG_INT_TX)
+    {
+        /* interrupt mode Tx, does not support */
+        RT_ASSERT(0);
+    }
+    else if (dev->flag & RT_DEVICE_FLAG_DMA_TX)
+    {
+        /* DMA mode Tx */
 
-		/* allocate a data node */
-		struct stm32_serial_data_node* data_node = (struct stm32_serial_data_node*)
-			rt_mp_alloc (&(uart->dma_tx->data_node_mp), RT_WAITING_FOREVER);
-		if (data_node == RT_NULL)
-		{
-			/* set error code */
-			err_code = -RT_ENOMEM;
-		}
-		else
-		{
-			rt_uint32_t level;
+        /* allocate a data node */
+        struct stm32_serial_data_node* data_node = (struct stm32_serial_data_node*)
+            rt_mp_alloc (&(uart->dma_tx->data_node_mp), RT_WAITING_FOREVER);
+        if (data_node == RT_NULL)
+        {
+            /* set error code */
+            err_code = -RT_ENOMEM;
+        }
+        else
+        {
+            rt_uint32_t level;
 
-			/* fill data node */
-			data_node->data_ptr 	= ptr;
-			data_node->data_size 	= size;
+            /* fill data node */
+            data_node->data_ptr     = ptr;
+            data_node->data_size    = size;
 
-			/* insert to data link */
-			data_node->next = RT_NULL;
+            /* insert to data link */
+            data_node->next = RT_NULL;
 
-			/* disable interrupt */
-			level = rt_hw_interrupt_disable();
+            /* disable interrupt */
+            level = rt_hw_interrupt_disable();
 
-			data_node->prev = uart->dma_tx->list_tail;
-			if (uart->dma_tx->list_tail != RT_NULL)
-				uart->dma_tx->list_tail->next = data_node;
-			uart->dma_tx->list_tail = data_node;
+            data_node->prev = uart->dma_tx->list_tail;
+            if (uart->dma_tx->list_tail != RT_NULL)
+                uart->dma_tx->list_tail->next = data_node;
+            uart->dma_tx->list_tail = data_node;
 
-			if (uart->dma_tx->list_head == RT_NULL)
-			{
-				/* start DMA to transmit data */
-				uart->dma_tx->list_head = data_node;
+            if (uart->dma_tx->list_head == RT_NULL)
+            {
+                /* start DMA to transmit data */
+                uart->dma_tx->list_head = data_node;
 
-				/* Enable DMA Channel */
-				rt_serial_enable_dma(uart->dma_tx->dma_channel,
-					(rt_uint32_t)uart->dma_tx->list_head->data_ptr,
-					uart->dma_tx->list_head->data_size);
-			}
+                /* Enable DMA Channel */
+                rt_serial_enable_dma(uart->dma_tx->dma_channel,
+                    (rt_uint32_t)uart->dma_tx->list_head->data_ptr,
+                    uart->dma_tx->list_head->data_size);
+            }
 
-			/* enable interrupt */
-			rt_hw_interrupt_enable(level);
-		}
-	}
-	else
-	{
-		/* polling mode */
-		if (dev->flag & RT_DEVICE_FLAG_STREAM)
-		{
-			/* stream mode */
-			while (size)
-			{
-				if (*ptr == '\n')
-				{
-					while (!(uart->uart_device->SR & USART_FLAG_TXE));
-					uart->uart_device->DR = '\r';
-				}
+            /* enable interrupt */
+            rt_hw_interrupt_enable(level);
+        }
+    }
+    else
+    {
+        /* polling mode */
+        if (dev->flag & RT_DEVICE_FLAG_STREAM)
+        {
+            /* stream mode */
+            while (size)
+            {
+                if (*ptr == '\n')
+                {
+                    while (!(uart->uart_device->SR & USART_FLAG_TXE));
+                    uart->uart_device->DR = '\r';
+                }
 
-				while (!(uart->uart_device->SR & USART_FLAG_TXE));
-				uart->uart_device->DR = (*ptr & 0x1FF);
+                while (!(uart->uart_device->SR & USART_FLAG_TXE));
+                uart->uart_device->DR = (*ptr & 0x1FF);
 
-				++ptr; --size;
-			}
-		}
-		else
-		{
-			/* write data directly */
-			while (size)
-			{
-				while (!(uart->uart_device->SR & USART_FLAG_TXE));
-				uart->uart_device->DR = (*ptr & 0x1FF);
+                ++ptr; --size;
+            }
+        }
+        else
+        {
+            /* write data directly */
+            while (size)
+            {
+                while (!(uart->uart_device->SR & USART_FLAG_TXE));
+                uart->uart_device->DR = (*ptr & 0x1FF);
 
-				++ptr; --size;
-			}
-		}
-	}
+                ++ptr; --size;
+            }
+        }
+    }
 
-	/* set error code */
-	rt_set_errno(err_code);
+    /* set error code */
+    rt_set_errno(err_code);
 
-	return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
+    return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
 }
 
 static rt_err_t rt_serial_control (rt_device_t dev, rt_uint8_t cmd, void *args)
 {
-	struct stm32_serial_device* uart;
+    struct stm32_serial_device* uart;
 
-	RT_ASSERT(dev != RT_NULL);
+    RT_ASSERT(dev != RT_NULL);
 
-	uart = (struct stm32_serial_device*)dev->user_data;
-	switch (cmd)
-	{
-	case RT_DEVICE_CTRL_SUSPEND:
-		/* suspend device */
-		dev->flag |= RT_DEVICE_FLAG_SUSPENDED;
-		USART_Cmd(uart->uart_device, DISABLE);
-		break;
+    uart = (struct stm32_serial_device*)dev->user_data;
+    switch (cmd)
+    {
+    case RT_DEVICE_CTRL_SUSPEND:
+        /* suspend device */
+        dev->flag |= RT_DEVICE_FLAG_SUSPENDED;
+        USART_Cmd(uart->uart_device, DISABLE);
+        break;
 
-	case RT_DEVICE_CTRL_RESUME:
-		/* resume device */
-		dev->flag &= ~RT_DEVICE_FLAG_SUSPENDED;
-		USART_Cmd(uart->uart_device, ENABLE);
-		break;
-	}
+    case RT_DEVICE_CTRL_RESUME:
+        /* resume device */
+        dev->flag &= ~RT_DEVICE_FLAG_SUSPENDED;
+        USART_Cmd(uart->uart_device, ENABLE);
+        break;
+    }
 
-	return RT_EOK;
+    return RT_EOK;
 }
 
 /*
@@ -284,87 +284,87 @@ static rt_err_t rt_serial_control (rt_device_t dev, rt_uint8_t cmd, void *args)
  */
 rt_err_t rt_hw_serial_register(rt_device_t device, const char* name, rt_uint32_t flag, struct stm32_serial_device *serial)
 {
-	RT_ASSERT(device != RT_NULL);
+    RT_ASSERT(device != RT_NULL);
 
-	if ((flag & RT_DEVICE_FLAG_DMA_RX) ||
-		(flag & RT_DEVICE_FLAG_INT_TX))
-	{
-		RT_ASSERT(0);
-	}
+    if ((flag & RT_DEVICE_FLAG_DMA_RX) ||
+        (flag & RT_DEVICE_FLAG_INT_TX))
+    {
+        RT_ASSERT(0);
+    }
 
-	device->type 		= RT_Device_Class_Char;
-	device->rx_indicate = RT_NULL;
-	device->tx_complete = RT_NULL;
-	device->init 		= rt_serial_init;
-	device->open		= rt_serial_open;
-	device->close		= rt_serial_close;
-	device->read 		= rt_serial_read;
-	device->write 		= rt_serial_write;
-	device->control 	= rt_serial_control;
-	device->user_data	= serial;
+    device->type        = RT_Device_Class_Char;
+    device->rx_indicate = RT_NULL;
+    device->tx_complete = RT_NULL;
+    device->init        = rt_serial_init;
+    device->open        = rt_serial_open;
+    device->close       = rt_serial_close;
+    device->read        = rt_serial_read;
+    device->write       = rt_serial_write;
+    device->control     = rt_serial_control;
+    device->user_data   = serial;
 
-	/* register a character device */
-	return rt_device_register(device, name, RT_DEVICE_FLAG_RDWR | flag);
+    /* register a character device */
+    return rt_device_register(device, name, RT_DEVICE_FLAG_RDWR | flag);
 }
 
 /* ISR for serial interrupt */
 void rt_hw_serial_isr(rt_device_t device)
 {
-	struct stm32_serial_device* uart = (struct stm32_serial_device*) device->user_data;
+    struct stm32_serial_device* uart = (struct stm32_serial_device*) device->user_data;
 
-	if(USART_GetITStatus(uart->uart_device, USART_IT_RXNE) != RESET)
-	{
-		/* interrupt mode receive */
-		RT_ASSERT(device->flag & RT_DEVICE_FLAG_INT_RX);
+    if(USART_GetITStatus(uart->uart_device, USART_IT_RXNE) != RESET)
+    {
+        /* interrupt mode receive */
+        RT_ASSERT(device->flag & RT_DEVICE_FLAG_INT_RX);
 
-		/* save on rx buffer */
-		while (uart->uart_device->SR & USART_FLAG_RXNE)
-		{
-			rt_base_t level;
+        /* save on rx buffer */
+        while (uart->uart_device->SR & USART_FLAG_RXNE)
+        {
+            rt_base_t level;
 
-			/* disable interrupt */
-			level = rt_hw_interrupt_disable();
+            /* disable interrupt */
+            level = rt_hw_interrupt_disable();
 
-			/* save character */
-			uart->int_rx->rx_buffer[uart->int_rx->save_index] = uart->uart_device->DR & 0xff;
-			uart->int_rx->save_index ++;
-			if (uart->int_rx->save_index >= UART_RX_BUFFER_SIZE)
-				uart->int_rx->save_index = 0;
+            /* save character */
+            uart->int_rx->rx_buffer[uart->int_rx->save_index] = uart->uart_device->DR & 0xff;
+            uart->int_rx->save_index ++;
+            if (uart->int_rx->save_index >= UART_RX_BUFFER_SIZE)
+                uart->int_rx->save_index = 0;
 
-			/* if the next position is read index, discard this 'read char' */
-			if (uart->int_rx->save_index == uart->int_rx->read_index)
-			{
-				uart->int_rx->read_index ++;
-				if (uart->int_rx->read_index >= UART_RX_BUFFER_SIZE)
-					uart->int_rx->read_index = 0;
-			}
+            /* if the next position is read index, discard this 'read char' */
+            if (uart->int_rx->save_index == uart->int_rx->read_index)
+            {
+                uart->int_rx->read_index ++;
+                if (uart->int_rx->read_index >= UART_RX_BUFFER_SIZE)
+                    uart->int_rx->read_index = 0;
+            }
 
-			/* enable interrupt */
-			rt_hw_interrupt_enable(level);
-		}
+            /* enable interrupt */
+            rt_hw_interrupt_enable(level);
+        }
 
-		/* clear interrupt */
-		USART_ClearITPendingBit(uart->uart_device, USART_IT_RXNE);
+        /* clear interrupt */
+        USART_ClearITPendingBit(uart->uart_device, USART_IT_RXNE);
 
-		/* invoke callback */
-		if (device->rx_indicate != RT_NULL)
-		{
-			rt_size_t rx_length;
+        /* invoke callback */
+        if (device->rx_indicate != RT_NULL)
+        {
+            rt_size_t rx_length;
 
-			/* get rx length */
-			rx_length = uart->int_rx->read_index > uart->int_rx->save_index ?
-				UART_RX_BUFFER_SIZE - uart->int_rx->read_index + uart->int_rx->save_index :
-				uart->int_rx->save_index - uart->int_rx->read_index;
+            /* get rx length */
+            rx_length = uart->int_rx->read_index > uart->int_rx->save_index ?
+                UART_RX_BUFFER_SIZE - uart->int_rx->read_index + uart->int_rx->save_index :
+                uart->int_rx->save_index - uart->int_rx->read_index;
 
-			device->rx_indicate(device, rx_length);
-		}
-	}
+            device->rx_indicate(device, rx_length);
+        }
+    }
 
-	if (USART_GetITStatus(uart->uart_device, USART_IT_TC) != RESET)
-	{
-		/* clear interrupt */
-		USART_ClearITPendingBit(uart->uart_device, USART_IT_TC);
-	}
+    if (USART_GetITStatus(uart->uart_device, USART_IT_TC) != RESET)
+    {
+        /* clear interrupt */
+        USART_ClearITPendingBit(uart->uart_device, USART_IT_TC);
+    }
 }
 
 /*
@@ -372,47 +372,47 @@ void rt_hw_serial_isr(rt_device_t device)
  */
 void rt_hw_serial_dma_tx_isr(rt_device_t device)
 {
-	rt_uint32_t level;
-	struct stm32_serial_data_node* data_node;
-	struct stm32_serial_device* uart = (struct stm32_serial_device*) device->user_data;
+    rt_uint32_t level;
+    struct stm32_serial_data_node* data_node;
+    struct stm32_serial_device* uart = (struct stm32_serial_device*) device->user_data;
 
-	/* DMA mode receive */
-	RT_ASSERT(device->flag & RT_DEVICE_FLAG_DMA_TX);
+    /* DMA mode receive */
+    RT_ASSERT(device->flag & RT_DEVICE_FLAG_DMA_TX);
 
-	/* get the first data node */
-	data_node = uart->dma_tx->list_head;
-	RT_ASSERT(data_node != RT_NULL);
+    /* get the first data node */
+    data_node = uart->dma_tx->list_head;
+    RT_ASSERT(data_node != RT_NULL);
 
-	/* invoke call to notify tx complete */
-	if (device->tx_complete != RT_NULL)
-		device->tx_complete(device, data_node->data_ptr);
+    /* invoke call to notify tx complete */
+    if (device->tx_complete != RT_NULL)
+        device->tx_complete(device, data_node->data_ptr);
 
-	/* disable interrupt */
-	level = rt_hw_interrupt_disable();
+    /* disable interrupt */
+    level = rt_hw_interrupt_disable();
 
-	/* remove list head */
-	uart->dma_tx->list_head = data_node->next;
-	if (uart->dma_tx->list_head == RT_NULL) /* data link empty */
-		uart->dma_tx->list_tail = RT_NULL;
+    /* remove list head */
+    uart->dma_tx->list_head = data_node->next;
+    if (uart->dma_tx->list_head == RT_NULL) /* data link empty */
+        uart->dma_tx->list_tail = RT_NULL;
 
-	/* enable interrupt */
-	rt_hw_interrupt_enable(level);
+    /* enable interrupt */
+    rt_hw_interrupt_enable(level);
 
-	/* release data node memory */
-	rt_mp_free(data_node);
+    /* release data node memory */
+    rt_mp_free(data_node);
 
-	if (uart->dma_tx->list_head != RT_NULL)
-	{
-		/* transmit next data node */
-		rt_serial_enable_dma(uart->dma_tx->dma_channel,
-			(rt_uint32_t)uart->dma_tx->list_head->data_ptr,
-			uart->dma_tx->list_head->data_size);
-	}
-	else
-	{
-		/* no data to be transmitted, disable DMA */
-		DMA_Cmd(uart->dma_tx->dma_channel, DISABLE);
-	}
+    if (uart->dma_tx->list_head != RT_NULL)
+    {
+        /* transmit next data node */
+        rt_serial_enable_dma(uart->dma_tx->dma_channel,
+            (rt_uint32_t)uart->dma_tx->list_head->data_ptr,
+            uart->dma_tx->list_head->data_size);
+    }
+    else
+    {
+        /* no data to be transmitted, disable DMA */
+        DMA_Cmd(uart->dma_tx->dma_channel, DISABLE);
+    }
 }
 
 /*@}*/
diff --git a/bsp/stm32f40x/drivers/usart.c b/bsp/stm32f40x/drivers/usart.c
index cd221ab0a2..6864a3fc92 100644
--- a/bsp/stm32f40x/drivers/usart.c
+++ b/bsp/stm32f40x/drivers/usart.c
@@ -39,9 +39,9 @@
 struct stm32_serial_int_rx uart1_int_rx;
 struct stm32_serial_device uart1 =
 {
-	USART1,
-	&uart1_int_rx,
-	RT_NULL
+    USART1,
+    &uart1_int_rx,
+    RT_NULL
 };
 struct rt_device uart1_device;
 #endif
@@ -50,9 +50,9 @@ struct rt_device uart1_device;
 struct stm32_serial_int_rx uart2_int_rx;
 struct stm32_serial_device uart2 =
 {
-	USART2,
-	&uart2_int_rx,
-	RT_NULL
+    USART2,
+    &uart2_int_rx,
+    RT_NULL
 };
 struct rt_device uart2_device;
 #endif
@@ -62,9 +62,9 @@ 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,
-	&uart3_dma_tx
+    USART3,
+    &uart3_int_rx,
+    &uart3_dma_tx
 };
 struct rt_device uart3_device;
 #endif
@@ -74,75 +74,75 @@ struct rt_device uart3_device;
 //#define USART3_DR_Base  0x40004804
 
 /* USART1_REMAP = 0 */
-#define UART1_GPIO_TX		GPIO_Pin_9
+#define UART1_GPIO_TX       GPIO_Pin_9
 #define UART1_TX_PIN_SOURCE GPIO_PinSource9
-#define UART1_GPIO_RX		GPIO_Pin_10
+#define UART1_GPIO_RX       GPIO_Pin_10
 #define UART1_RX_PIN_SOURCE GPIO_PinSource10
-#define UART1_GPIO			GPIOA
+#define UART1_GPIO          GPIOA
 #define UART1_GPIO_RCC      RCC_AHB1Periph_GPIOA
-#define RCC_APBPeriph_UART1	RCC_APB2Periph_USART1
-#define UART1_TX_DMA		DMA1_Channel4
-#define UART1_RX_DMA		DMA1_Channel5
+#define RCC_APBPeriph_UART1 RCC_APB2Periph_USART1
+#define UART1_TX_DMA        DMA1_Channel4
+#define UART1_RX_DMA        DMA1_Channel5
 
-#define UART2_GPIO_TX	    GPIO_Pin_2
+#define UART2_GPIO_TX       GPIO_Pin_2
 #define UART2_TX_PIN_SOURCE GPIO_PinSource2
-#define UART2_GPIO_RX	    GPIO_Pin_3
+#define UART2_GPIO_RX       GPIO_Pin_3
 #define UART2_RX_PIN_SOURCE GPIO_PinSource3
-#define UART2_GPIO	    	GPIOA
-#define UART2_GPIO_RCC   	RCC_AHB1Periph_GPIOA
-#define RCC_APBPeriph_UART2	RCC_APB1Periph_USART2
+#define UART2_GPIO          GPIOA
+#define UART2_GPIO_RCC      RCC_AHB1Periph_GPIOA
+#define RCC_APBPeriph_UART2 RCC_APB1Periph_USART2
 
 /* USART3_REMAP[1:0] = 00 */
-#define UART3_GPIO_TX		GPIO_Pin_10
+#define UART3_GPIO_TX       GPIO_Pin_10
 #define UART3_TX_PIN_SOURCE GPIO_PinSource10
-#define UART3_GPIO_RX		GPIO_Pin_11
+#define UART3_GPIO_RX       GPIO_Pin_11
 #define UART3_RX_PIN_SOURCE GPIO_PinSource11
-#define UART3_GPIO			GPIOB
-#define UART3_GPIO_RCC   	RCC_AHB1Periph_GPIOB
-#define RCC_APBPeriph_UART3	RCC_APB1Periph_USART3
-#define UART3_TX_DMA		DMA1_Stream1
-#define UART3_RX_DMA		DMA1_Stream3
+#define UART3_GPIO          GPIOB
+#define UART3_GPIO_RCC      RCC_AHB1Periph_GPIOB
+#define RCC_APBPeriph_UART3 RCC_APB1Periph_USART3
+#define UART3_TX_DMA        DMA1_Stream1
+#define UART3_RX_DMA        DMA1_Stream3
 
 static void RCC_Configuration(void)
 {
 #ifdef RT_USING_UART1
-	/* Enable USART2 GPIO clocks */
-	RCC_AHB1PeriphClockCmd(UART1_GPIO_RCC, ENABLE);
-	/* Enable USART2 clock */
-	RCC_APB2PeriphClockCmd(RCC_APBPeriph_UART1, ENABLE);
+    /* Enable USART2 GPIO clocks */
+    RCC_AHB1PeriphClockCmd(UART1_GPIO_RCC, ENABLE);
+    /* Enable USART2 clock */
+    RCC_APB2PeriphClockCmd(RCC_APBPeriph_UART1, ENABLE);
 #endif
 
 #ifdef RT_USING_UART2
-	/* Enable USART2 GPIO clocks */
-	RCC_AHB1PeriphClockCmd(UART2_GPIO_RCC, ENABLE);
-	/* Enable USART2 clock */
-	RCC_APB1PeriphClockCmd(RCC_APBPeriph_UART2, ENABLE);
+    /* Enable USART2 GPIO clocks */
+    RCC_AHB1PeriphClockCmd(UART2_GPIO_RCC, ENABLE);
+    /* Enable USART2 clock */
+    RCC_APB1PeriphClockCmd(RCC_APBPeriph_UART2, ENABLE);
 #endif
 
 #ifdef RT_USING_UART3
-	/* Enable USART3 GPIO clocks */
-	RCC_AHB1PeriphClockCmd(UART3_GPIO_RCC, ENABLE);
-	/* Enable USART3 clock */
-	RCC_APB1PeriphClockCmd(RCC_APBPeriph_UART3, ENABLE);
+    /* Enable USART3 GPIO clocks */
+    RCC_AHB1PeriphClockCmd(UART3_GPIO_RCC, ENABLE);
+    /* Enable USART3 clock */
+    RCC_APB1PeriphClockCmd(RCC_APBPeriph_UART3, ENABLE);
 
-	/* DMA clock enable */
-	RCC_APB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
+    /* DMA clock enable */
+    RCC_APB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
 #endif
 }
 
 static void GPIO_Configuration(void)
 {
-	GPIO_InitTypeDef GPIO_InitStructure;
+    GPIO_InitTypeDef GPIO_InitStructure;
 
-	GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF;
-	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
-	GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
-	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
+    GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF;
+    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
+    GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
+    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
 
 #ifdef RT_USING_UART1
-	/* Configure USART1 Rx/tx PIN */
-	GPIO_InitStructure.GPIO_Pin = UART1_GPIO_RX | UART1_GPIO_TX;
-	GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
+    /* Configure USART1 Rx/tx PIN */
+    GPIO_InitStructure.GPIO_Pin = UART1_GPIO_RX | UART1_GPIO_TX;
+    GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
 
     /* Connect alternate function */
     GPIO_PinAFConfig(UART1_GPIO, UART1_TX_PIN_SOURCE, GPIO_AF_USART1);
@@ -150,9 +150,9 @@ static void GPIO_Configuration(void)
 #endif
 
 #ifdef RT_USING_UART2
-	/* Configure USART2 Rx/tx PIN */
-	GPIO_InitStructure.GPIO_Pin = UART2_GPIO_TX | UART2_GPIO_RX;
-	GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
+    /* Configure USART2 Rx/tx PIN */
+    GPIO_InitStructure.GPIO_Pin = UART2_GPIO_TX | UART2_GPIO_RX;
+    GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
 
     /* Connect alternate function */
     GPIO_PinAFConfig(UART2_GPIO, UART2_TX_PIN_SOURCE, GPIO_AF_USART2);
@@ -160,9 +160,9 @@ static void GPIO_Configuration(void)
 #endif
 
 #ifdef RT_USING_UART3
-	/* Configure USART3 Rx/tx PIN */
-	GPIO_InitStructure.GPIO_Pin = UART3_GPIO_RX | UART3_GPIO_RX;
-	GPIO_Init(UART3_GPIO, &GPIO_InitStructure);
+    /* Configure USART3 Rx/tx PIN */
+    GPIO_InitStructure.GPIO_Pin = UART3_GPIO_RX | UART3_GPIO_RX;
+    GPIO_Init(UART3_GPIO, &GPIO_InitStructure);
 
     /* Connect alternate function */
     GPIO_PinAFConfig(UART3_GPIO, UART3_TX_PIN_SOURCE, GPIO_AF_USART3);
@@ -172,44 +172,44 @@ static void GPIO_Configuration(void)
 
 static void NVIC_Configuration(void)
 {
-	NVIC_InitTypeDef NVIC_InitStructure;
+    NVIC_InitTypeDef NVIC_InitStructure;
 
 #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_IRQn;
-	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
-	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_IRQChannelPreemptionPriority = 1;
+    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 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_Stream1_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_Stream1_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_UART3)
-	DMA_InitTypeDef DMA_InitStructure;
+    DMA_InitTypeDef DMA_InitStructure;
 
 //  /* Configure DMA Stream */
 //  DMA_InitStructure.DMA_Channel = DMA_CHANNEL;
@@ -249,24 +249,24 @@ static void DMA_Configuration(void)
   DMA_DeInit(UART3_TX_DMA);
   DMA_Init(UART3_TX_DMA, &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;
+//    /* 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);
+//    /* 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
 }
 
@@ -277,73 +277,73 @@ volatile USART_TypeDef * uart2_debug = USART2;
  */
 void rt_hw_usart_init()
 {
-	USART_InitTypeDef USART_InitStructure;
+    USART_InitTypeDef USART_InitStructure;
 
-	RCC_Configuration();
+    RCC_Configuration();
 
-	GPIO_Configuration();
+    GPIO_Configuration();
 
-	NVIC_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_Init(USART1, &USART_InitStructure);
+    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_Init(USART1, &USART_InitStructure);
 
-	/* register uart1 */
-	rt_hw_serial_register(&uart1_device, "uart1",
-		RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
-		&uart1);
+    /* 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);
+    /* 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_Init(USART2, &USART_InitStructure);
+    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_Init(USART2, &USART_InitStructure);
 
-	/* register uart2 */
-	rt_hw_serial_register(&uart2_device, "uart2",
-		RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
-		&uart2);
+    /* 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);
+    /* 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_Init(USART3, &USART_InitStructure);
+    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_Init(USART3, &USART_InitStructure);
 
-//	uart3_dma_tx.dma_channel= UART3_TX_DMA;
+//    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);
+    /* 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 USART3 DMA Tx request */
+    USART_DMACmd(USART3, USART_DMAReq_Tx , ENABLE);
 
-	/* enable interrupt */
-	USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
+    /* enable interrupt */
+    USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
 #endif
 }