1、功能说明
    USB MSC + CDC 组合设备

2、使用环境

    软件开发环境：KEIL MDK-ARM V5.34
                  IAR EWARM 8.50.1 
    芯片支持：
        N32H760
        N32H762
        N32H765
        N32H765EC
        N32H785
        N32H785EC
        N32H787
    开发板支持：
        N32H787_EVB
        N32H787_HMI
        N32H787_EVB_PRO


3、使用说明
    描述相关模块配置方法；例如:时钟，I/O等 
         1. SystemClock：HSE_PLL 600MHz
         2. USBHS Clock: HSE 25MHz
         3. 串口：USART1 TX -- PA9  RX -- PA10 波特率：115200
         4. NSS--PA4、SCK--PA5、MISO--PA6、MOSI--PA7 (连接W25Q128)

    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 USB1/USB2 口，电脑识别出虚拟串口设备和U 盘设备
         3. 将 USART1 接到串口工具上，然后在PC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
   1. 可通过修改宏定义 USE_USB_HS_IN_FS 或 USE_USB_HS_IN_HS 切换设备为全速模式或者高速模式；
      另外需要使用10MHz、12MHz、19.2MHz、24MHz、25MHz、27MHz、30MHz、或40MHz外部晶体。
   2. 使用H78x工程时需保证CM4有代码运行，建议跑LED点灯Demo(examples_m4\GPIO\LedBlink)。

1. Function description
    USB MSC + CDC composite device

2. Development environment
    Software development environment: KEIL MDK-ARM V5.34
                                      IAR EWARM 8.50.1 
    MCU support:
        N32H760
        N32H762
        N32H765
        N32H765EC
        N32H785
        N32H785EC
        N32H787
    Development board support：
        N32H787_EVB
        N32H787_HMI
        N32H787_EVB_PRO

3. How to use
    Describe the configuration method of related modules; for example: clock, I/O, etc. 
        1. SystemClock: HSE_PLL 600MHz
        2. USBHS Clock: HSE 25MHz
        3. Serial port: USART1 TX -- PA9  RX -- PA10 Baud rate: 115200
        4. SPI1 configuration: NSS--PA4, SCK--PA5, MISO--PA6, MOSI--PA7 (connected to W25Q128)

    Describe the testing steps and phenomena of the Demo
    1. After compiling, the downloaded program is reset and run;
    2. Connect a USB cable to the USB1/USB2 port. The computer identifies the virtual serial port device and U disk device
    3. Connect USART1 to the serial port tool, then open the USB virtual serial port on the PC, and send data through the USB virtual serial port.
       Use the serial port tool to receive data, and then use the serial port tool to send data, USB virtual serial port to receive data

4. Attention
    1. The device can be switched to Full-Speed mode or High-Speed mode by modify the macro definition USE_USB_HS_IN_FS or USE_USB_HS_IN_HS;
       In addition, external crystal of 10MHz, 12MHz, 19.2MHz, 24MHz, 25MHz, 27MHz, 30MHz or 40MHz is required.
    2. When using the H78x project, it is necessary to ensure that the CM4 has code to run, and it is recommended to run the LED lighting demo(examples_m4\GPIO\LedBlink). 
