1. 功能说明
    USB Printer 打印机设备

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

    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，电脑识别出 USB 打印支持，可以通过EP2向打印机发送数据，在EP2回调函数中打断点可以看到正常接收数据。

4. 注意事项
    无

1. Function description
    USB Printer Device

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
                  
    Describe the test steps and phenomena of Demo 
        1. After compiling, download the program to reset and run;
        2. By connecting the USB cable to the J4 USB port, the computer recognizes the SUPPORT of USB printing and can send data to the printer through EP2,
            and the breakpoint in the EP2 callback function can be seen normally received data.
 
4. Matters needing attention
    None.