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                                样例使用说明
                                Sample Description
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功能描述：
此样例演示了通过PA6引脚唤醒MCU的功能。下载程序并运行后，LED灯处于常亮状态；按下
用户按键后，LED灯处于常暗状态，且MCU进入STOP模式；拉低PA6引脚后，MCU唤醒，LED灯
处于闪烁状态。

Function descriptions:
This example demonstrates the function of waking up an MCU through the PA6 pin.
After downloading the program and running it, the LED light is constantly on;
After pressing the user button, the LED light is in a constant dark state and
the MCU enters STOP mode; After pulling down the PA6 pin, the MCU wakes up and
the LED light is in a flashing state.
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测试环境：
测试用板：PY32F403_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: PY32F403_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. 小灯处于常亮状态，按下用户按键，LED灯处于常暗状态，且MCU进入STOP模式
3. 拉低PA6引脚后，MCU唤醒，LED灯处于闪烁状态

Example execution steps:
1.Compile and download the program to MCU and run it;
2.The small light is in a constant light state, press the user button, the LED
light is in a constant dark state, and the MCU enters STOP mode;
3.After pulling down the PA6 pin, the MCU wakes up and the LED light is in a
flashing state.
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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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