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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：
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:
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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