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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采集通过DMA传输并从串口打印四个通道的电压值，PA4/PA5/PA6/PA7为模
拟输入，每隔1s会从串口PA2/PA3打印当前的电压值。

Function descriptions:
This sample demonstrates ADC data acquisition using DMA and printing the 
voltage values of four channels via the serial port. PA4/PA5/PA6/PA7 are 
analog inputs, andthe current voltage values will be printed every 1s via 
the serial port PA2/PA3.
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测试环境：
测试用板：PY32MD430_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: PY32MD430_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1s会打印一次PA4,PA5,PA6,PA7的电压值。

Example execution steps:
1.Compile and download the program to the MCU and run it.
2.The serial port will print the voltage values of PA4, PA5, PA6, and PA7 
every 1s.
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注意事项：
如果需要使用按键:
StartKit版本为V2.0以下,需将StartKit.h中的StartKitVersion 2 注释掉，并打开
StartKitVersion 1
StartKit版本为V2.0及以上版本,则无需操作
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:
If you need to use buttons:
StartKit version is below V2.0, you need to comment StartKitVersion 2 in
StartKit.h, and open StartKitVersion 1 
StartKit version is V2.0 and above, no operation is required
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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