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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stop模式下，GPIO外部中断唤醒功能。

Function descriptions:
This sample demonstrates the GPIO external interrupt wake-up feature in stop mode.

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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. LED灯亮，按下按键，LED灯灭，进入stop模式；
3. 在PA06上产生一个下降沿，程序退出stop模式；
4. LED以500ms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 will be on initially. Press the button, and the LED will turn off, 
entering stop mode;
3. Generate a falling edge on PA06, and the program will exit stop mode;
4. The LED will toggle at intervals of 500ms.

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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。

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 function, it is necessary to disconnect the SWD
cable and power it back on, as by default, the emulator will reset the
DBGMCU_CR.DBG_STOP position.
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