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                                样例使用说明
                             Sample Description
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功能描述：
此样例演示了通过软件方式将RESET引脚改为普通GPIO。

Function descriptions:
This sample demonstrates the change of the RESET pin to a normal GPIO by 
software.
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测试环境：
测试用板：PY32F072_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: PY32F072_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. 请将MCU断电并重新上电；
3. 按下按键，RST键变为GPIO功能，LED亮；
4. 注释掉"#define OB_GPIO_PIN_MODE LL_FLASH_NRST_MODE_GPIO",
   打开"#define OB_GPIO_PIN_MODE LL_FLASH_NRST_MODE_RESET",编译重新下载到MCU;
5. 将MCU断电并重新上电；
6. 按下按键，RST键变为RESET功能，LED亮；

Example execution steps:
1. compile and download the program to the MCU and run it;
2. power off and re-power the MCU;
3. Press the button,the RST key changes to GPIO function and the LED lights up;
4. Comment out "#define OB_GPIO_PIN_MODE LL_FLASH_NRST_MODE_GPIO" and turn
   on "#define OB_GPIO_PIN_MODE LL_FLASH_NRST_MODE_RESET".
Compile and re-download to MCU.
5. power off and re-power the MCU;
6. Press the button,the RST key changes to RESET function and the LED lights up;
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注意事项：
该样例将RST的按键改成GPIO功能，在使用其他样例前请将RST按键改回RST功能。

Notes:
This example changes the RST button to GPIO function, please change the RST
button back to RST function before using other examples.
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