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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DMA多通道传输功能，在DMA完成中断中打印多通道的电压值。

Function descriptions:
This example demonstrates the DMA multi-channel transmission function of ADC,
which prints the voltage values of multiple channels during the DMA completion
interrupt.
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测试环境：
测试用板：PY32T090_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: PY32T090_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打印一次通道10(PD0)/通道11(PD1)/通道12(PD2)/通道13(PD3)的电压值。

Example execution steps:
1. Compile and download the program and run it;
2. The serial port prints the voltage values of channel 10 (PD0)/channel 11 (PD1)/
channel 12 (PD2)/channel 13 (PD3) 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
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:
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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