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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：PY32L090_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: PY32L090_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. 串口每隔1s打印一次PD0的电压值；

Example execution steps:
1. Compile and download the program;
2. The serial port prints the voltage of PD0 every 1 second;
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注意事项：
使用vrefbuf,PA0需接1uf电容到地
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
PB9(TX)   -->  RX
PB8(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:
To use VREFBuf, PA0 needs to connect a 1UF capacitor to ground.
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
PB9(TX)   -->  RX
PB8(RX)   -->  TX
GND       -->  GND
UART is configured as BaudRate 115200, data bit 8, stop bit 1, and parity None.
@PrintfConfigEnd
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