1. ˵
    USBģ⴮

2. ʹû
    Ӳ̶ӦĿӲƽ̨ 
    壺   N32L43XM-STB N32L40XM-STB V1.1

3. ʹ˵
    ģ÷:ʱӣI/O 
         1. SystemClock48MHz
         2. USBClock: 48MHz
         3. GPIOUSART1TX--PA9RX--PA10 115200

    DemoĲԲ 
         1. سλУ
         2. ͨ USB  J3 USB ڣUSB ɺڵ豸пԿĴڣ USART1 ӵڹϣ USB ⴮ڣUSB ⴮ڷݣôڹ߽ݣȻôڹ߷ݣ USB ⴮ڽ

4. ע
    MCU_TX  MCU_RX ñȡ

1. Function description
    USB virtual serial port

2. Use environment
    Hardware environment: development hardware platform corresponding to the project 
    Development board:      N32L43XM-STB N32L40XM-STB V1.1

3. Instructions for use
    Describe the configuration method of related modules; for example: clock, I/O, etc. 
        1. SystemClock: 48MHz
        2. USBClock: 48MHz
        3. GPIO: USART1 (TX--PA9, RX--PA10) baud rate 115200
                  
    Describe the test steps and phenomena of Demo 
        1. After compiling, download the program to reset and run;
        2. Connect THE USB cable to THE J3 USB port. After the USB is mounted, the newly added serial port can be seen in 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
    The jumper caps of MCU_TX and MCU_RX need to be removed.