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                                样例使用说明
                             Sample Description
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功能描述：
本样例主要展示GPIO的FAST IO输出功能,FAST IO速度可以达到单周期翻转速度。

Function descriptions:
This example mainly demonstrates the FAST IO output function of GPIO, which can
achieve a single cycle flip speed.
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测试环境：
测试用板：PY32F072C_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: PY32F072C_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. 编译下载程序到MCU，并运行；
2. GPIO每个时钟周期输出翻转一次，可观测到端口PA11输出频率为12MHz的波形。

Example execution steps:
1.Compile and download the program to MCU and run it;
2. GPIO flips the output once per clock cycle, and a waveform with an output 
frequency of 12MHz can be observed from port PA11.
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注意事项：

Notes:

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