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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CRC校验功能，通过对一个数组里的数据进行校验，得到的校验值与理论校验
值进行比较，相等则LED灯亮，否则LED灯熄灭。

Function descriptions:
This sample demonstrates the CRC function, which performs a CRC calculation on
the data in an array and compares the result with the theoretical value; if 
equal,the LED is on, otherwise the LED is off.
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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. 观察LED灯是否亮起，如果灯亮表示运行成功，否则运行失败。

Example execution steps:
1. compile and download the program to MCU and run it;
2. Check if the LED is lighted, if it is lighted, it means the execution  is
successful, otherwise the execution fails.
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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

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

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