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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的Vrebuf功能。

Function descriptions:
This example demonstrates the Vrebuf function of ADC.
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测试环境：
测试用板：PY32MD550_STK
MDK版本： 5.28

Test environment:
Test board: PY32MD550_STK
MDK Version: 5.28
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使用步骤：
1. 编译并下载程序；
2. 串口每隔1s打印一次PA4的电压值；

Example execution steps:
1. Compile and download the program;
2. The serial port prints the voltage value of PA4 every 1 second;
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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, and the connection
method 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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