diff --git a/bsp/stm32f10x/drivers/usart.c b/bsp/stm32f10x/drivers/usart.c
index b3960d749ace1bfc08b7a310ba8a38bc5fd56915..1c61b184a6549e117a8a3d40013bf83ede5e5a73 100644
--- a/bsp/stm32f10x/drivers/usart.c
+++ b/bsp/stm32f10x/drivers/usart.c
@@ -45,6 +45,7 @@ struct stm32_uart
 {
     USART_TypeDef *uart_device;
     IRQn_Type irq;
+#ifdef RT_SERIAL_USING_DMA    
     struct stm32_uart_dma
     {
         /* dma channel */
@@ -58,9 +59,12 @@ struct stm32_uart
         /* last receive index */
         rt_size_t last_recv_index;
     } dma;
+#endif /* RT_SERIAL_USING_DMA */    
 };
 
+#ifdef RT_SERIAL_USING_DMA
 static void DMA_Configuration(struct rt_serial_device *serial);
+#endif /* RT_SERIAL_USING_DMA */ 
 
 static rt_err_t stm32_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
 {
@@ -107,7 +111,6 @@ static rt_err_t stm32_configure(struct rt_serial_device *serial, struct serial_c
 static rt_err_t stm32_control(struct rt_serial_device *serial, int cmd, void *arg)
 {
     struct stm32_uart* uart;
-    rt_uint32_t ctrl_arg = (rt_uint32_t)(arg);
 
     RT_ASSERT(serial != RT_NULL);
     uart = (struct stm32_uart *)serial->parent.user_data;
@@ -128,12 +131,14 @@ static rt_err_t stm32_control(struct rt_serial_device *serial, int cmd, void *ar
         /* enable interrupt */
         USART_ITConfig(uart->uart_device, USART_IT_RXNE, ENABLE);
         break;
+#ifdef RT_SERIAL_USING_DMA
         /* USART config */
     case RT_DEVICE_CTRL_CONFIG :
-        if (ctrl_arg == RT_DEVICE_FLAG_DMA_RX) {
+        if ((rt_uint32_t)(arg) == RT_DEVICE_FLAG_DMA_RX) {
             DMA_Configuration(serial);
         }
         break;
+#endif /* RT_SERIAL_USING_DMA */    
     }
     return RT_EOK;
 }
@@ -182,6 +187,7 @@ static int stm32_getc(struct rt_serial_device *serial)
     return ch;
 }
 
+#ifdef RT_SERIAL_USING_DMA
 /**
  * Serial port receive idle process. This need add to uart idle ISR.
  *
@@ -231,6 +237,7 @@ static void dma_rx_done_isr(struct rt_serial_device *serial) {
 
     DMA_ClearFlag(uart->dma.rx_gl_flag);
 }
+#endif /* RT_SERIAL_USING_DMA */ 
 
 /**
  * Uart common interrupt process. This need add to uart ISR.
@@ -251,10 +258,12 @@ static void uart_isr(struct rt_serial_device *serial) {
         /* clear interrupt */
         USART_ClearITPendingBit(uart->uart_device, USART_IT_RXNE);
     }
+#ifdef RT_SERIAL_USING_DMA    
     if(USART_GetITStatus(uart->uart_device, USART_IT_IDLE) != RESET)
     {
         dma_uart_rx_idle_isr(serial);
     }
+#endif /* RT_SERIAL_USING_DMA */     
     if (USART_GetITStatus(uart->uart_device, USART_IT_TC) != RESET)
     {
         /* clear interrupt */
@@ -284,6 +293,7 @@ static const struct rt_uart_ops stm32_uart_ops =
 struct stm32_uart uart1 =
 {
     USART1,
+#ifdef RT_SERIAL_USING_DMA
     USART1_IRQn,
     {
         DMA1_Channel5,
@@ -291,6 +301,7 @@ struct stm32_uart uart1 =
         DMA1_Channel5_IRQn,
         0,
     },
+#endif /* RT_SERIAL_USING_DMA */       
 };
 struct rt_serial_device serial1;
 
@@ -305,6 +316,7 @@ void USART1_IRQHandler(void)
     rt_interrupt_leave();
 }
 
+#ifdef RT_SERIAL_USING_DMA
 void DMA1_Channel5_IRQHandler(void) {
     /* enter interrupt */
     rt_interrupt_enter();
@@ -314,6 +326,8 @@ void DMA1_Channel5_IRQHandler(void) {
     /* leave interrupt */
     rt_interrupt_leave();
 }
+#endif /* RT_SERIAL_USING_DMA */   
+
 #endif /* RT_USING_UART1 */
 
 #if defined(RT_USING_UART2)
@@ -321,6 +335,7 @@ void DMA1_Channel5_IRQHandler(void) {
 struct stm32_uart uart2 =
 {
     USART2,
+#ifdef RT_SERIAL_USING_DMA    
     USART2_IRQn,
     {
         DMA1_Channel6,
@@ -328,6 +343,7 @@ struct stm32_uart uart2 =
         DMA1_Channel6_IRQn,
         0,
     },
+#endif /* RT_SERIAL_USING_DMA */       
 };
 struct rt_serial_device serial2;
 
@@ -342,6 +358,7 @@ void USART2_IRQHandler(void)
     rt_interrupt_leave();
 }
 
+#ifdef RT_SERIAL_USING_DMA    
 void DMA1_Channel6_IRQHandler(void) {
     /* enter interrupt */
     rt_interrupt_enter();
@@ -351,6 +368,8 @@ void DMA1_Channel6_IRQHandler(void) {
     /* leave interrupt */
     rt_interrupt_leave();
 }
+#endif /* RT_SERIAL_USING_DMA */  
+
 #endif /* RT_USING_UART2 */
 
 #if defined(RT_USING_UART3)
@@ -358,6 +377,7 @@ void DMA1_Channel6_IRQHandler(void) {
 struct stm32_uart uart3 =
 {
     USART3,
+#ifdef RT_SERIAL_USING_DMA     
     USART3_IRQn,
     {
         DMA1_Channel3,
@@ -365,6 +385,7 @@ struct stm32_uart uart3 =
         DMA1_Channel3_IRQn,
         0,
     },
+#endif /* RT_SERIAL_USING_DMA */   
 };
 struct rt_serial_device serial3;
 
@@ -379,6 +400,7 @@ void USART3_IRQHandler(void)
     rt_interrupt_leave();
 }
 
+#ifdef RT_SERIAL_USING_DMA  
 void DMA1_Channel3_IRQHandler(void) {
     /* enter interrupt */
     rt_interrupt_enter();
@@ -388,6 +410,8 @@ void DMA1_Channel3_IRQHandler(void) {
     /* leave interrupt */
     rt_interrupt_leave();
 }
+#endif /* RT_SERIAL_USING_DMA */
+
 #endif /* RT_USING_UART3 */
 
 #if defined(RT_USING_UART4)
@@ -395,6 +419,7 @@ void DMA1_Channel3_IRQHandler(void) {
 struct stm32_uart uart4 =
 {
     UART4,
+#ifdef RT_SERIAL_USING_DMA  
     UART4_IRQn,
     {
         DMA2_Channel3,
@@ -402,6 +427,7 @@ struct stm32_uart uart4 =
         DMA2_Channel3_IRQn,
         0,
     },
+#endif /* RT_SERIAL_USING_DMA */    
 };
 struct rt_serial_device serial4;
 
@@ -416,6 +442,7 @@ void UART4_IRQHandler(void)
     rt_interrupt_leave();
 }
 
+#ifdef RT_SERIAL_USING_DMA  
 void DMA2_Channel3_IRQHandler(void) {
     /* enter interrupt */
     rt_interrupt_enter();
@@ -425,6 +452,8 @@ void DMA2_Channel3_IRQHandler(void) {
     /* leave interrupt */
     rt_interrupt_leave();
 }
+#endif /* RT_SERIAL_USING_DMA */
+
 #endif /* RT_USING_UART4 */
 
 static void RCC_Configuration(void)
@@ -521,6 +550,7 @@ static void NVIC_Configuration(struct stm32_uart* uart)
     NVIC_Init(&NVIC_InitStructure);
 }
 
+#ifdef RT_SERIAL_USING_DMA
 static void DMA_Configuration(struct rt_serial_device *serial) {
     struct stm32_uart *uart = (struct stm32_uart *) serial->parent.user_data;
     struct rt_serial_rx_fifo *rx_fifo = (struct rt_serial_rx_fifo *)serial->serial_rx;
@@ -562,6 +592,7 @@ static void DMA_Configuration(struct rt_serial_device *serial) {
     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
     NVIC_Init(&NVIC_InitStructure);
 }
+#endif /* RT_SERIAL_USING_DMA */   
 
 void rt_hw_usart_init(void)
 {
diff --git a/bsp/stm32f40x/drivers/usart.c b/bsp/stm32f40x/drivers/usart.c
index bd8ea3239b61f2a24455c8aa94f3fe83612030dc..3caedd5ce0510c19db698741b4ee7cb93288983a 100644
--- a/bsp/stm32f40x/drivers/usart.c
+++ b/bsp/stm32f40x/drivers/usart.c
@@ -66,6 +66,7 @@ struct stm32_uart
 {
     USART_TypeDef *uart_device;
     IRQn_Type irq;
+#ifdef RT_SERIAL_USING_DMA
     struct stm32_uart_dma
     {
         /* dma stream */
@@ -81,9 +82,12 @@ struct stm32_uart
         /* last receive index */
         rt_size_t last_recv_index;
     } dma;
+#endif /* RT_SERIAL_USING_DMA */ 
 };
-
+ 
+#ifdef RT_SERIAL_USING_DMA 
 static void DMA_Configuration(struct rt_serial_device *serial);
+#endif /* RT_SERIAL_USING_DMA */ 
 
 static rt_err_t stm32_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
 {
@@ -130,7 +134,6 @@ static rt_err_t stm32_configure(struct rt_serial_device *serial, struct serial_c
 static rt_err_t stm32_control(struct rt_serial_device *serial, int cmd, void *arg)
 {
     struct stm32_uart* uart;
-    rt_uint32_t ctrl_arg = (rt_uint32_t)(arg);
 
     RT_ASSERT(serial != RT_NULL);
     uart = (struct stm32_uart *)serial->parent.user_data;
@@ -149,11 +152,13 @@ static rt_err_t stm32_control(struct rt_serial_device *serial, int cmd, void *ar
         /* enable interrupt */
         USART_ITConfig(uart->uart_device, USART_IT_RXNE, ENABLE);
         break;
+#ifdef RT_SERIAL_USING_DMA
         /* USART config */
     case RT_DEVICE_CTRL_CONFIG :
-        if (ctrl_arg == RT_DEVICE_FLAG_DMA_RX) {
+        if ((rt_uint32_t)(arg) == RT_DEVICE_FLAG_DMA_RX) {
             DMA_Configuration(serial);
         }
+#endif /* RT_SERIAL_USING_DMA */      
     }
 
     return RT_EOK;
@@ -190,6 +195,7 @@ static int stm32_getc(struct rt_serial_device *serial)
     return ch;
 }
 
+#ifdef RT_SERIAL_USING_DMA
 /**
  * DMA initialize by DMA_InitStruct structure
  *
@@ -278,6 +284,7 @@ static void dma_rx_done_isr(struct rt_serial_device *serial)
         DMA_ClearFlag(uart->dma.rx_stream, uart->dma.rx_flag);
     }
 }
+#endif /* RT_SERIAL_USING_DMA */ 
 
 /**
  * Uart common interrupt process. This need add to uart ISR.
@@ -296,10 +303,12 @@ static void uart_isr(struct rt_serial_device *serial)
         /* clear interrupt */
         USART_ClearITPendingBit(uart->uart_device, USART_IT_RXNE);
     }
+#ifdef RT_SERIAL_USING_DMA       
     if(USART_GetITStatus(uart->uart_device, USART_IT_IDLE) != RESET)
     {
         dma_uart_rx_idle_isr(serial);
     }
+#endif /* RT_SERIAL_USING_DMA */       
     if (USART_GetITStatus(uart->uart_device, USART_IT_TC) != RESET)
     {
         /* clear interrupt */
@@ -325,6 +334,7 @@ static const struct rt_uart_ops stm32_uart_ops =
 struct stm32_uart uart1 =
 {
     USART1,
+#ifdef RT_SERIAL_USING_DMA       
     USART1_IRQn,
     {
         DMA2_Stream5,
@@ -333,6 +343,7 @@ struct stm32_uart uart1 =
         DMA2_Stream5_IRQn,
         0,
     },
+#endif /* RT_SERIAL_USING_DMA */    
 };
 struct rt_serial_device serial1;
 
@@ -347,6 +358,7 @@ void USART1_IRQHandler(void)
     rt_interrupt_leave();
 }
 
+#ifdef RT_SERIAL_USING_DMA   
 void DMA2_Stream5_IRQHandler(void) {
     /* enter interrupt */
     rt_interrupt_enter();
@@ -356,6 +368,8 @@ void DMA2_Stream5_IRQHandler(void) {
     /* leave interrupt */
     rt_interrupt_leave();
 }
+#endif /* RT_SERIAL_USING_DMA */
+
 #endif /* RT_USING_UART1 */
 
 #if defined(RT_USING_UART2)
@@ -363,6 +377,7 @@ void DMA2_Stream5_IRQHandler(void) {
 struct stm32_uart uart2 =
 {
     USART2,
+#ifdef RT_SERIAL_USING_DMA
     USART2_IRQn,
     {
         DMA1_Stream5,
@@ -372,6 +387,7 @@ struct stm32_uart uart2 =
         0,
         0,
     },
+#endif /* RT_SERIAL_USING_DMA */    
 };
 struct rt_serial_device serial2;
 
@@ -386,6 +402,7 @@ void USART2_IRQHandler(void)
     rt_interrupt_leave();
 }
 
+#ifdef RT_SERIAL_USING_DMA
 void DMA1_Stream5_IRQHandler(void) {
     /* enter interrupt */
     rt_interrupt_enter();
@@ -395,6 +412,8 @@ void DMA1_Stream5_IRQHandler(void) {
     /* leave interrupt */
     rt_interrupt_leave();
 }
+#endif /* RT_SERIAL_USING_DMA */
+
 #endif /* RT_USING_UART2 */
 
 #if defined(RT_USING_UART3)
@@ -402,6 +421,7 @@ void DMA1_Stream5_IRQHandler(void) {
 struct stm32_uart uart3 =
 {
     USART3,
+#ifdef RT_SERIAL_USING_DMA    
     USART3_IRQn,
     {
         DMA1_Stream1,
@@ -411,6 +431,7 @@ struct stm32_uart uart3 =
         0,
         0,
     },
+#endif /* RT_SERIAL_USING_DMA */    
 };
 struct rt_serial_device serial3;
 
@@ -425,6 +446,7 @@ void USART3_IRQHandler(void)
     rt_interrupt_leave();
 }
 
+#ifdef RT_SERIAL_USING_DMA
 void DMA1_Stream1_IRQHandler(void) {
     /* enter interrupt */
     rt_interrupt_enter();
@@ -434,6 +456,8 @@ void DMA1_Stream1_IRQHandler(void) {
     /* leave interrupt */
     rt_interrupt_leave();
 }
+#endif /* RT_SERIAL_USING_DMA */
+
 #endif /* RT_USING_UART3 */
 
 #if defined(RT_USING_UART4)
@@ -441,6 +465,7 @@ void DMA1_Stream1_IRQHandler(void) {
 struct stm32_uart uart4 =
 {
     UART4,
+#ifdef RT_SERIAL_USING_DMA
     UART4_IRQn,
     {
         DMA1_Stream2,
@@ -450,6 +475,7 @@ struct stm32_uart uart4 =
         0,
         0,
     },
+#endif /* RT_SERIAL_USING_DMA */
 };
 struct rt_serial_device serial4;
 
@@ -464,6 +490,7 @@ void UART4_IRQHandler(void)
     rt_interrupt_leave();
 }
 
+#ifdef RT_SERIAL_USING_DMA
 void DMA1_Stream2_IRQHandler(void) {
     /* enter interrupt */
     rt_interrupt_enter();
@@ -473,6 +500,8 @@ void DMA1_Stream2_IRQHandler(void) {
     /* leave interrupt */
     rt_interrupt_leave();
 }
+#endif /* RT_SERIAL_USING_DMA */
+
 #endif /* RT_USING_UART4 */
 
 #if defined(RT_USING_UART5)
@@ -480,6 +509,7 @@ void DMA1_Stream2_IRQHandler(void) {
 struct stm32_uart uart5 =
 {
     UART5,
+#ifdef RT_SERIAL_USING_DMA    
     UART5_IRQn,
     {
         DMA1_Stream0,
@@ -489,6 +519,7 @@ struct stm32_uart uart5 =
         0,
         0,
     },
+#endif /* RT_SERIAL_USING_DMA */    
 };
 struct rt_serial_device serial5;
 
@@ -503,6 +534,7 @@ void UART5_IRQHandler(void)
     rt_interrupt_leave();
 }
 
+#ifdef RT_SERIAL_USING_DMA
 void DMA1_Stream0_IRQHandler(void) {
     /* enter interrupt */
     rt_interrupt_enter();
@@ -512,6 +544,8 @@ void DMA1_Stream0_IRQHandler(void) {
     /* leave interrupt */
     rt_interrupt_leave();
 }
+#endif /* RT_SERIAL_USING_DMA */
+
 #endif /* RT_USING_UART5 */
 
 static void RCC_Configuration(void)
@@ -626,6 +660,7 @@ static void NVIC_Configuration(struct stm32_uart *uart)
     NVIC_Init(&NVIC_InitStructure);
 }
 
+#ifdef RT_SERIAL_USING_DMA
 static void DMA_Configuration(struct rt_serial_device *serial) {
     struct stm32_uart *uart = (struct stm32_uart *) serial->parent.user_data;
     struct rt_serial_rx_fifo *rx_fifo = (struct rt_serial_rx_fifo *)serial->serial_rx;
@@ -653,6 +688,7 @@ static void DMA_Configuration(struct rt_serial_device *serial) {
     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
     NVIC_Init(&NVIC_InitStructure);
 }
+#endif /* RT_SERIAL_USING_DMA */
 
 int stm32_hw_usart_init(void)
 {