1、功能说明
    USB MSC 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：
        无开发板支持SPI-Flash

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. SPI1配置：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，USB 挂载完成后，识别成 U 盘设备

4、注意事项
    1. 首次挂载 U 盘需要格式化，格式化完成后即可当成 U 盘使用。
    2. 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。
    3. 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 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：
        No development board supports SPI-Flash

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. SPI1 configuration: NSS--PA4, SCK--PA5, MISO--PA6, MOSI--PA7 (connected to W25Q128)
    
    Describe the testing steps and phenomena of the Demo

        1. Download the program after compiling and reset it to run;
        2. Connect the USB1/USB2 port via a USB cable, and after the USB is mounted, it will be recognized as a U disk device.
        
4. Attention
     1. The first mount U disk needs to be formatted, and it can be used as a U disk after formatting.
     2. 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.
     3. 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). 
