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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WWDG的窗口看门狗功能，配置WWDG的窗口上限（下限固定是0x3F），程序中
通过delay延时函数，确保程序是在WWDG计数窗口内进行喂狗动作，通过LED灯闪烁，可以判
断窗口内喂狗并未产生复位。

Function descriptions:
This sample demonstrates the window function of the WWDG (Window Watchdog). 
The upper limit of the watchdog window is configured (the lower limit is fixed 
at 0x3F). The program uses a delay function (delay) to ensure that the watchdog 
is refreshed within the watchdog counting window. The LED blinking indicates 
whether the watchdog is fed within the window and no reset occurs.
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测试环境：
测试用板：PY32MD320_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: PY32MD320_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. 编译下载程序并运行；
2. 程序默认会在窗口时间内喂狗，程序不会复位，LED灯一直闪烁；
3. 注释掉宏定义”#WINDOW_IN",打开宏定义“WINDOW_UPPER”，重新编译下载并运行；
4. 程序会一直复位,LED灯循环点亮4s，熄灭500ms；
5. 注释掉宏定义”#WINDOW_UPPER",打开宏定义“WINDOW_LOWER”,重新编译下载并运行；
6. 程序会一直复位,LED灯循环点亮4s，熄灭500ms。

Example execution steps:
1.Compile and download the program to the MCU.
2.By default, the program will feed the watchdog within the window time, 
and no reset will occur. The LED will keep blinking.
3.Comment out the macro definition "#WINDOW_IN" and uncomment the macro 
definition "WINDOW_UPPER". Recompile and download the program.
4.The program will continuously reset, and the LED will cycle on for 4 seconds 
and then off for 500 milliseconds.
5.Comment out the macro definition "#WINDOW_UPPER" and uncomment the macro 
definition "WINDOW_LOWER". Recompile and download the program.
6.The program will continuously reset, and the LED will cycle on for 4 seconds 
and then off for 500 milliseconds.
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注意事项：

Notes:
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