if(size == 1)
    {
            rt_device_read(dev, 0, &uart_rx_buffer[pos], size);
            rt_device_write(dev, 0, &uart_rx_buffer[pos], size);
            if((pos == 0)&&(uart_rx_buffer[pos] == 'L')) pos++;
            else if((pos == 1)&&(uart_rx_buffer[pos] == 'E')) pos++;
            else if((pos == 2)&&(uart_rx_buffer[pos] == 'D')) pos++;
            else if((pos == 3)&&(uart_rx_buffer[pos] == ' ')) pos++;
            else if (pos == 4)
            {
                    if(uart_rx_buffer[pos] == 'R')
                    {
                            LED_ON(LED_R);
                            LED_OFF(LED_Y);
                    }
                    else if(uart_rx_buffer[pos] == 'Y')
                    {
                            LED_OFF(LED_R);
                            LED_ON(LED_Y);
                    }
                    pos = 0;
            }
            else pos = 0;
    }
    else
            rt_kprintf("Please set the uart to interrupt RX mode!<br>");
return RT_EOK;

    /*LED控制脚设置为输出模式*/
    rt_pin_mode(LED_R, PIN_MODE_OUTPUT_OD);
    rt_pin_mode(LED_Y, PIN_MODE_OUTPUT_OD);
    /*初始化默认关闭LED灯，全彩灯共阳连接，高电平为关*/
    rt_pin_write(LED_R ,1);
    rt_pin_write(LED_Y ,1);
    uart_device = rt_device_find("uart2");  
    rt_device_set_rx_indicate(uart_device, uart_rx_ind);
    rt_device_open(uart_device, (RT_DEVICE_OFLAG_RDWR | RT_DEVICE_FLAG_INT_RX));