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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比较器唤醒功能，PA0作为比较器正端输入，VREFINT作为比较器负端输
入，进入stop模式后，通过调整PA0上的输入电压，产生中断唤醒stop模式。

Function descriptions:
This example demonstrates the COMP comparator wake-up function, with PA0 as the
positive input and VREFINT as the negative input of the comparator. After
entering stop mode, the interrupt wake-up stop mode is generated by adjusting
the input voltage on PA0.
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测试环境：
测试用板：PY32F072E_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: PY32F072E_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. LED亮起后按下按键，进入stop模式，LED熄灭；
3. 在PA0上输入从小于1.1V到的大于1.3V电压时，产生中断，LED点亮1s；
4. 接下来LED每隔200ms进行翻转，程序正常运行。

Example execution steps:
1.Compile and download the program to MCU and run it;
2.After the LED lights up, press the button to enter the stop mode, and the
LED goes out;
3.When inputting a voltage from less than 1.1V to greater than 1.3V on PA0, an
interrupt is generated and the LED lights up for 1 second;
4. Next, the LED flips every 200ms and the program runs normally
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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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