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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PGA的差分输入ADC采样功能，调节两个滑动变阻器，改变PGA两端输入电压，串口
实时打印PGA放大后的电压值，LED1每隔1s翻转一次。

Function descriptions:
This example demonstrates the differential input ADC sampling function of PGA,
adjusting two sliding resistors, changing the input voltage at both ends of PGA, 
and the serial port Real time printing of the amplified voltage value of PGA, 
LED1 flips every 1 second.
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测试环境：
测试用板：DPM32M087RBTx_EVB V1.0
MDK版本： 5.28

Test environment:
Test board: DPM32M087RBTx_EVB V1.0
MDK Version: 5.28
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使用步骤：
1. 接上P10上的跳线帽，将串口接到USB，连接P2跳帽，将PA0,PA1连接到滑动变阻器。
2. 编译下载程序到MCU，并运行。
3. 串口输出实时电压。
4. 可观察到开发板上的LED1每隔1s翻转一次。

Example execution steps:
1. Connect the jumper cap on P10, connect the serial port to USB, connect the P2 
jumper cap, and connect PA0, PA1 is connected to the sliding rheostat.
2. Compile and download the program to MCU, and run it.
3. Real time voltage output through serial port.
4. It can be observed that LED1 on the development board flips every 1 second.
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注意事项：
LED引脚如下：
LED1       -> PC10

UART引脚如下：
UART_Tx    -> PA9
UART_Rx    -> PA10

PGA引脚如下：
PGA_P    -> PA0
PGA_P    -> PA1

Notes:
The LED pins are as follows:
LED1       -> PC10

The UART pins are as follows:
UART_Tx    -> PA9
UART_Rx    -> PA10

The PGA pins are as follows:
PGA_P    -> PA0
PGA_P    -> PA1
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