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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，PA02作为比较器正端输入，1/2VCCA 作为负端输入，通
过调整PA02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 PA02 as the
negative input of the comparator and 1/2VCCA as the positive input. By adjusting
the input voltage on PA02, 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：PY32F005_STK
MDK版本： 5.41
IAR版本： 9.20
GCC 版本：GNU Arm Embedded Toolchain 10.3-2021.10

Test environment:
Test board: PY32F005_STK
MDK Version: 5.41
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PA02输入大于1.03V电压，LED灯亮；
3. 配置PA02输入小于1.03V电压，LED灯灭。

Example execution steps:
1. Compile and download the program to MCU and run it;
2. Configure PA02 input voltage greater than 1.03V and LED light on;
3. If the input voltage of PA02 is less than 1.03V, the LED light will be off.
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注意事项：
通过USB转TTL模块连接PC与STK板,STK板与USB转TTL模块的连线方式如下；
STK板          USB转TTL模块
PB4(TX)   -->  RX
GND       -->  GND
UART配置为波特率9600

Notes:
Connect the PC to the STK board through the USB to TTL module, and the connection
method between the STK board and the USB to TTL module is as follows:
STK board     USB to TTL module
PB4(TX)  -->  RX
GND      -->  GND
UART is configured as BaudRate 9600
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