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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 MIDI设备功能
USB 音频设备主要是借助 USB audio 类实现，将其模拟成一个扬声器设备,实际数据使用midi
端点传输

Function descriptions:
This sample demonstrates the USB MIDI functionality. The USB audio device is mainly
implemented through the USB Audio class, which simulates it as a speaker device, 
and the actual data uses midi endpoint transmission
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测试环境：
测试用板：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: 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. 在PC电脑上打开MIDI-OX上位机，点击菜单 “options-MIDI devices…” ，MIDI Inputs选
择 “PUYA MIDI DEMO”，MIDI Outputs选择 “Microsoft GS Wavetable Synth”。
3. 可以听到一段音乐。

1. Download and run the program;
2. Open the MIDI-OX host computer on the PC, and click the menu "options-MIDI 
devices..." MIDI Inputs selection Select "PUYA MIDI DEMO", and for MIDI Outputs,
select "Microsoft GS Wavetable Synth".
3. One can hear a piece of music.
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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

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

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