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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TIM触发和轮询的功能。

Function descriptions:
This sample demonstrates the TIM triggr function and polling function of the ADC.
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测试环境：
测试用板：PY32F002B_STK
MDK版本： 5.28
IAR版本： 9.20

Test environment:
Test board: PY32F002B_STK
MDK Version: 5.28
IAR Version: 9.20
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使用步骤：
1. 编译并下载程序；
2. 串口每隔1s打印一次通道4(PA7)的转换值.

Example execution steps:
1. Compile and download the program and run it
2. USART printf conversation data of the channel 4(PA7) once per 1s
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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；
STK板        USB转TTL模块
PB4(TX)  -->  RX
PB5(RX)  -->  TX
GND      -->  GND

Notes:
Connect the PC to the STK board through the USB to TTL module, the connection
between the STK board and the USB to TTL module is as follows:
STK board      USB to TTL module
PB4(TX)    --> RX
PB5(RX)    --> TX
GND        --> GND
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