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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UART1半双工模式，配置PD0为开漏上拉输出、复用串口模式，需接外部上拉，
串口1接收一个字节后立马发送出来，并从串口0打印接收的数据，LED1每隔1s翻转一次。

Function descriptions:
This example demonstrates UART1 half duplex mode, with PD0 configured as open 
drain pull-up output and multiplexed serial port mode, requiring external 
pull-up connection,Serial port 1 receives a byte and immediately sends it out 
and print the received data from serial port 0, while 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. 编译下载程序到MCU，并运行。
2. 可观察到开发板上的LED1每隔1s翻转一次。
3. 串口1接收一个字节后立马发送出来，并从串口0打印接收的数据。

Example execution steps:
1. Compile and download the program to MCU, and run it.
2. It can be observed that LED1 on the development board flips every 1 second.
3. Serial port 1 receives a byte and immediately sends it out, and prints the 
received data from serial port 0.
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注意事项：
LED引脚如下：
LED1       -> PC10

UART引脚如下：
UART0_Tx   -> PA9
UART0_Rx   -> PA10
UART1_Tx   -> PD0

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

The UART pins are as follows:
UART0-Tx   -> PA9
UART0-Rx   -> PA10
UART1-Tx   -> PD0
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