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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COMP比较器轮询功能，PA04作为比较器负端输入，1/2VCCA 作为正端输入，通
过调整PA04上的输入电压，当检测到比较器输出状态为高时，LED灯亮，比较器输出状态为
低时，LED灯灭。

Function descriptions:
This sample demonstrates the COMP polling function, with PA04 as the negative
comparator input and 1/2VCCA as the positive input. Adjust the input voltage
on PA04, the LED will be on when the comparator output state is detected as high
and be off when the comparator output state is low.
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测试环境：
测试用板：PY32F002B_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: PY32F002B_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. 配置PA04输入大于1.65V电压，LED灯灭；
3. 配置PA04输入小于1.65V电压，LED灯亮。


Example execution steps:
1. Compile and download the program and run it
2. when the PA04 input is larger than 1.65V,LED off
3. When PA04 input is less than 1.65V,LED on
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注意事项：

Notes:
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