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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 example demonstrates the COMP comparator polling function, with PA04 as the
negative input of the comparator and 1/2VCCA as the positive input. By adjusting
the input voltage on PA04, the LED lights up when the comparator output state is
detected to be high, and turns off when the comparator output state is low.
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测试环境：
测试用板：PY32L020_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: PY32L020_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 to MCU and run it;
2. Configure PA04 input voltage greater than 1.65V and LED light off;
3. If the input voltage of PA04 is less than 1.65V, the LED light will be on.
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注意事项：

Notes:
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