1. 功能说明
    USB模拟串口

2. 使用环境

    软件开发环境：KEIL MDK-ARM V5.34
                  IAR EWARM 8.50.1

    硬件开发环境：
        N32H49X系列：
        基于全功能板N32H497ZGL7_EVB V1.0开发

3. 使用说明
    描述相关模块配置方法；例如:时钟，I/O等 
         1. SystemClock：240MHz
         2. HSE: 16MHz
		 3. USBClock: 48MHz
         4. GPIO：USART1（TX--PA9，RX--PA10）波特率 115200
         5. 虚拟串口：
            - 波特率：115200
            - 数据位：8
            - 停止位：1
            - 奇偶校验：无
            - 波特率： 115200 
         

    描述Demo的测试步骤和现象 
         1. 编译后下载程序复位运行；
         2. 通过 USB 线连接 J4 USB 口，USB 挂载完成后，在电脑设备管理中可以看到新增的串口，将 USART1 接到串口工具上，
            打开 USB 虚拟串口，USB 虚拟串口发送数据，用串口工具接收数据，然后用串口工具发送数据， USB 虚拟串口接收数据。

4. 注意事项
    无

1. Function description
    USB virtual serial port

2. Use environment

    Software development environment: KEIL MDK-ARM V5.34
                                      IAR EWARM 8.50.1

    Hardware development environment:
        N32H49X series:
        Developed based on the full-function board N32H497ZGL7_EVB V1.0

3. Instructions for use
    Describe the configuration method of related modules; for example: clock, I/O, etc. 
        1. SystemClock: 240MHz
        2. HSE: 16MHz
		3. USBClock: 48MHz
        4. GPIO: USART1 (TX--PA9, RX--PA10) baud rate 115200
        5. Virtual serial port：
            - Baud rate: 115200
            - Data bits: 8
            - Stop position: 1
            - Parity check: none
            - Baud rate: 115200
                  
    Describe the test steps and phenomena of Demo 
        1. After compiling, download the program to reset and run;
        2. Connect the J4 USB port via a USB cable. After the USB mount is complete, you can see the newly added serial port in the computer device management. 
           Connect USART1 to the serial port tool, open the USB virtual serial port, send data through the USB virtual serial port, receive data with the serial port tool, 
           and then send data with the serial port tool, USB virtual serial port receives data.
 
4. Matters needing attention
    None