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                                样例使用说明
                             Sample Description
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功能描述：
此样例演示了USB打印机的枚举功能。

Function descriptions:
This sample demonstrates the enumeration function of the USB printer.

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测试环境：
测试用板：PY32F403_STK
MDK版本： 5.28
IAR版本： 9.20
GCC版本：GNU Arm Embedded Toolchain 10.3-2021.10

Test environment:
Test board: PY32F403_STK
MDK Version: 5.28
IAR Version: 9.20
GCC Version: GNU Arm Embedded Toolchain 10.3-2021.10

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使用步骤：
1. 下载并运行程序；
2. 通过USB连接线，一端连接STK板，另一端连接PC电脑；
3. PC端显示连接打印机；

Example execution steps:
1. Download and run the program;
2. Connect the STK board to the PC computer using the USB cable;
3. The PC will display the connection of the printer;

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注意事项：
如果需要使用按键:
StartKit版本为V2.0以下,需将StartKit.h中的StartKitVersion 2 注释掉，并打开
StartKitVersion 1
StartKit版本为V2.0及以上版本,则无需操作
1. 此样例只实现了USB打印机枚举过程，因为打印机的数据传输过程跟具体的设备有关，
   不宜做成demo。

Notes:
If you need to use buttons:
StartKit version is below V2.0, you need to comment StartKitVersion 2 in
StartKit.h, and open StartKitVersion 1 
StartKit version is V2.0 and above, no operation is required
1. This sample only demonstrates the enumeration process of the USB printer. 
   The data transmission process of the printer is device-specific and not 
   suitable for demonstration purposes.

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