fix #347

Author: armink

bsp/stm32f10x/drivers/usart.c

@@ -69,8 +69,6 @@ static rt_err_t stm32_configure(struct rt_serial_device *serial, struct serial_c
 
     /* Enable USART */
     USART_Cmd(uart->uart_device, ENABLE);
-    /* enable interrupt */
-    USART_ITConfig(uart->uart_device, USART_IT_RXNE, ENABLE);
 
     return RT_EOK;
 }
@@ -84,13 +82,19 @@ static rt_err_t stm32_control(struct rt_serial_device *serial, int cmd, void *ar
 
     switch (cmd)
     {
+        /* disable interrupt */
     case RT_DEVICE_CTRL_CLR_INT:
         /* disable rx irq */
         UART_DISABLE_IRQ(uart->irq);
+        /* disable interrupt */
+        USART_ITConfig(uart->uart_device, USART_IT_RXNE, DISABLE);
         break;
+        /* enable interrupt */
     case RT_DEVICE_CTRL_SET_INT:
         /* enable rx irq */
         UART_ENABLE_IRQ(uart->irq);
+        /* enable interrupt */
+        USART_ITConfig(uart->uart_device, USART_IT_RXNE, ENABLE);
         break;
     }