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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输出模式，配置4个LED引脚为数字输出模式，并且每隔1000ms依次点亮
4个LED灯。运行程序后，可以看到4个LED依次点亮。

Function descriptions:
This example demonstrates GPIO output mode, with 4 LED pins configured for 
digital output mode and lit up sequentially every 1000ms 4 LED lights. After 
running the program, you can see that four LEDs light up in sequence.
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测试环境：
测试用板：DPM32M087RBTx_EVB V1.0
MDK版本： 5.28

Test environment:
Test board: DPM32M087RBTx_EVB V1.0
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. 可观察到开发板上的4个LED每隔1000ms依次点亮。

Example execution steps:
1. Compile and download the program to MCU, and run it.
2. It can be observed that the four LEDs on the development board light up 
sequentially every 1000ms.
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注意事项：
LED引脚如下：
LED1    -> PC10
LED2    -> PC11
LED3    -> PC12
LED4    -> PC13

Notes:
The LED pins are as follows:
LED1    -> PC10
LED2    -> PC11
LED3    -> PC12
LED4    -> PC13
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