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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Vrefint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 example demonstrates the Vrefint sampling function of the ADC module. By
sampling the value of Vrefint, the VCC value is calculated and printed through
the serial port.
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测试环境：
测试用板：PY32T020_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: PY32T020_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. 串口打印VCC的电压值。

Example execution steps:
1. Compile and download the program and run it;
2. The serial port prints the voltage value of the VCC.
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注意事项：
通过USB转TTL模块连接PC与STK板,STK板与USB转TTL模块的连线方式如下；
@PrintfConfigStart
STK板        USB转TTL模块
PA2(TX)  -->  RX
PA3(RX)  -->  TX
GND      -->  GND
UART配置为波特率115200，数据位8，停止位1，校验位None
@PrintfConfigEnd

Notes:
Connect the PC to the STK board through the USB to TTL module, the connection
between the STK board and the USB to TTL module is as follows:
@PrintfConfigStart
STK board      USB to TTL module
PA2(TX)  -->  RX
PA3(RX)  -->  TX
GND        --> GND
UART is configured as BaudRate 115200, data bit 8, stop bit 1, and parity None.
@PrintfConfigEnd
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