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                                样例使用说明
                             Sample Description
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功能描述：
此样例演示了在sleep模式下，使用GPIO事件唤醒。

Function descriptions:
This sample demonstrates using GPIO event to wake up the MCU from sleep mode.
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测试环境：
测试用板：PY32F003_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: PY32F003_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灯亮，按下按键，LED灯灭，进入sleep模式；
3. 在PA06上产生一个下降沿，程序退出sleep模式；
4. LED以200ms的间隔进行翻转。

Example execution steps:
1.Compile and download the program to the MCU and run it.
2.The LED lights up. Press the button, and the LED turns off, entering 
sleep mode.
3.Generate a falling edge on PA06 to wake up the MCU from sleep mode.
4.The LED toggles at an interval of 200ms.
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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
1，演示此样例功能时需要断开swd连接线并重新上电，因为默认情况下，仿真器会把
DBGMCU_CR.DBG_STOP置位。
2，注意关闭systick中断，防止该中断唤醒MCU。

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
1.To demonstrate this sample functionality, disconnect the SWD connection 
and power cycle the board, as the debugger sets the DBGMCU_CR.DBG_STOP bit 
by default.
2.Make sure to disable the SysTick interrupt to prevent it from waking 
up the MCU.
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