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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ADC模块的VCC采样功能，通过采样VREFINT的值，计算得出VCC的值，并通过
串口打印出来。

Function descriptions:
This sample demonstrates the VCC sampling functionality of the ADC module. By 
sampling the value of VREFINT and performing calculations, the VCC voltage value 
is obtained and printed via the serial port.
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测试环境：
测试用板：PY32MD310_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: PY32MD310_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. 串口每隔500ms打印VCC的电压值。

Example execution steps:
1.Compile and download the program to the MCU and run it.
2.The voltage value of VCC is printed via the serial port every 500 milliseconds.
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注意事项：
STK板        USB转TTL模块
PA02(TX) --> RX
PA03(RX) --> TX
GND      --> GND

波特率:115200

Notes:
STK board    USB to TTL module
PA02(TX) --> RX
PA03(RX) --> TX
GND      --> GND

Baud rate: 115200
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