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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单次轮询(Polling)的方式采样AN0,AN1,AN4通道,并通过串口打印出来。

Function descriptions:
This sample demonstrates the ADC single-channel polling mode to sample channels 
AN0, AN1, and AN4. The sampled values are then printed via the serial port.
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测试环境：
测试用板：PY32F003_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: PY32F003_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. 串口循环打印通道0(PA0)，通道1(PA1)，通道4(PA4)的电压。

Example execution steps:
1.Compile and download the program to the MCU and run it.
2.The voltages of channels 0(PA0), 1(PA1), and 4(PA4) are printed in a loop via the serial port.
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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
PA02(TX)  -->  RX
PA03(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
PA02(TX)  -->  RX
PA03(RX)  -->  TX
GND       -->  GND
UART is configured as BaudRate 115200, data bit 8, stop bit 1, and parity None.
@PrintfConfigEnd
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