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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OPA的电压跟随功能，PB3为正端输入，PA15为负端输入，PB4为输出，PB4会输
出和PB3相同的电压值。

Function descriptions:
This sample demonstrates the voltage follower functionality of the OPA. PB3 
is the positive input, PA15 is the negative input, and PB4 is the output. PB4 
will output the same voltage as PB3.
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测试环境：
测试用板：PY32MD420_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: PY32MD420_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. 编译并下载程序。
2. 将PA15和PB4短接。
3. 在PB3端输入1V、2V、3V，观察PB4端检测到的电压值，应与PB3端输入的电压值相同。

Example execution steps:
1. Compile and download the program.
2. Short PA15 and PB4 together.
3. Input 1V, 2V, and 3V at the PB3 pin. Observe the voltage detected at the 
PB4 pin, which should be the same as the input voltage at PB3.
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注意事项：

Notes:

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