diff --git a/bsp/stm32f10x/drivers/usart.c b/bsp/stm32f10x/drivers/usart.c
index b73f48519a8fa9461b558dbb10463fc145c5407a..17411e44e81e4ff31947bb97a06a773359e9f9fc 100644
--- a/bsp/stm32f10x/drivers/usart.c
+++ b/bsp/stm32f10x/drivers/usart.c
@@ -17,23 +17,22 @@
 #include "stm32f10x.h"
 #include "usart.h"
 #include "board.h"
-
 #include <rtdevice.h>
 
 /* USART1 */
-#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
 
 /* USART2 */
-#define UART2_GPIO_TX       GPIO_Pin_2
-#define UART2_GPIO_RX       GPIO_Pin_3
-#define UART2_GPIO          GPIOA
+#define UART2_GPIO_TX        GPIO_Pin_2
+#define UART2_GPIO_RX        GPIO_Pin_3
+#define UART2_GPIO           GPIOA
 
 /* USART3_REMAP[1:0] = 00 */
-#define UART3_GPIO_TX       GPIO_Pin_10
-#define UART3_GPIO_RX       GPIO_Pin_11
-#define UART3_GPIO          GPIOB
+#define UART3_GPIO_TX        GPIO_Pin_10
+#define UART3_GPIO_RX        GPIO_Pin_11
+#define UART3_GPIO           GPIOB
 
 /* STM32 uart driver */
 struct stm32_uart
@@ -54,15 +53,26 @@ static rt_err_t stm32_configure(struct rt_serial_device *serial, struct serial_c
 
     USART_InitStructure.USART_BaudRate = cfg->baud_rate;
 
-    if (cfg->data_bits == DATA_BITS_8)
+    if (cfg->data_bits == DATA_BITS_8){
         USART_InitStructure.USART_WordLength = USART_WordLength_8b;
+    } else if (cfg->data_bits == DATA_BITS_9) {
+        USART_InitStructure.USART_WordLength = USART_WordLength_9b;
+    }
 
-    if (cfg->stop_bits == STOP_BITS_1)
+    if (cfg->stop_bits == STOP_BITS_1){
         USART_InitStructure.USART_StopBits = USART_StopBits_1;
-    else if (cfg->stop_bits == STOP_BITS_2)
+    } else if (cfg->stop_bits == STOP_BITS_2){
         USART_InitStructure.USART_StopBits = USART_StopBits_2;
+    }
+
+    if (cfg->parity == PARITY_NONE){
+        USART_InitStructure.USART_Parity = USART_Parity_No;
+    } else if (cfg->parity == PARITY_ODD) {
+        USART_InitStructure.USART_Parity = USART_Parity_Odd;
+    } else if (cfg->parity == PARITY_EVEN) {
+        USART_InitStructure.USART_Parity = USART_Parity_Even;
+    }
 
-    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(uart->uart_device, &USART_InitStructure);
@@ -162,6 +172,7 @@ void USART1_IRQHandler(void)
         /* clear interrupt */
         USART_ClearITPendingBit(uart->uart_device, USART_IT_RXNE);
     }
+
     if (USART_GetITStatus(uart->uart_device, USART_IT_TC) != RESET)
     {
         /* clear interrupt */
@@ -254,21 +265,21 @@ void USART3_IRQHandler(void)
 
 static void RCC_Configuration(void)
 {
-#ifdef RT_USING_UART1
+#if defined(RT_USING_UART1)
     /* Enable UART GPIO clocks */
     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
     /* Enable UART clock */
     RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
 #endif /* RT_USING_UART1 */
 
-#ifdef RT_USING_UART2
+#if defined(RT_USING_UART2)
     /* Enable UART GPIO clocks */
     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
     /* Enable UART clock */
     RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
 #endif /* RT_USING_UART2 */
 
-#ifdef RT_USING_UART3
+#if defined(RT_USING_UART3)
     /* Enable UART GPIO clocks */
     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
     /* Enable UART clock */
@@ -282,7 +293,7 @@ static void GPIO_Configuration(void)
 
     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
 
-#ifdef RT_USING_UART1
+#if defined(RT_USING_UART1)
     /* Configure USART Rx/tx PIN */
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
     GPIO_InitStructure.GPIO_Pin = UART1_GPIO_RX;
@@ -293,7 +304,7 @@ static void GPIO_Configuration(void)
     GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
 #endif /* RT_USING_UART1 */
 
-#ifdef RT_USING_UART2
+#if defined(RT_USING_UART2)
     /* Configure USART Rx/tx PIN */
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
     GPIO_InitStructure.GPIO_Pin = UART2_GPIO_RX;
@@ -304,7 +315,7 @@ static void GPIO_Configuration(void)
     GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
 #endif /* RT_USING_UART2 */
 
-#ifdef RT_USING_UART3
+#if defined(RT_USING_UART3)
     /* Configure USART Rx/tx PIN */
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
     GPIO_InitStructure.GPIO_Pin = UART3_GPIO_RX;
@@ -336,7 +347,7 @@ void rt_hw_usart_init(void)
     RCC_Configuration();
     GPIO_Configuration();
 
-#ifdef RT_USING_UART1
+#if defined(RT_USING_UART1)
     uart = &uart1;
     config.baud_rate = BAUD_RATE_115200;
 
@@ -347,11 +358,11 @@ void rt_hw_usart_init(void)
 
     /* register UART1 device */
     rt_hw_serial_register(&serial1, "uart1",
-                          RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
+                          RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX ,
                           uart);
 #endif /* RT_USING_UART1 */
 
-#ifdef RT_USING_UART2
+#if defined(RT_USING_UART2)
     uart = &uart2;
 
     config.baud_rate = BAUD_RATE_115200;
@@ -366,7 +377,7 @@ void rt_hw_usart_init(void)
                           uart);
 #endif /* RT_USING_UART2 */
 
-#ifdef RT_USING_UART3
+#if defined(RT_USING_UART3)
     uart = &uart3;
 
     config.baud_rate = BAUD_RATE_115200;