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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GPIO的中断功能，配置PA0上升沿下降沿中断，在PA0的中断处理函数中翻转PA1。

Function descriptions:
This sample demonstrates the interrupt function of GPIO. It configures the rising 
edge and falling edge interrupts for PA0, and toggles PA1 in the interrupt handler 
function of PA0. 
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测试环境：
测试用板：DPM32M030_REV_A
MDK版本： 5.28

Test environment:
Test board: DPM32M030_REV_A
MDK Version: 5.28
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使用步骤：
1. 编译下载程序到MCU，并运行。
2. 给予PA0上升沿下降沿信号，PA1可输出翻转信号

Example execution steps:
1. Compile and download the program to MCU, and run it.
2. When the rising and falling edge signals are applied to PA0, the flip signal 
can be outputted at PA1.
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注意事项：
输入GPIO    -> PA0
输出GPIO    -> PA1

Notes:
input GPIO    -> PA0
output GPIO   -> PA1
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