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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UART2的232中断收发数据功能，系统复位后，UART2通过232输出字符串，输出完成
后等待接收32字节数据完成，接收完成串口打印日志，LED1每个1s翻转一次。

Function descriptions:
This example demonstrates the 232 interrupt data sending and receiving function 
of UART2. After the system is reset, UART2 outputs a string through 232. After 
the output is completed, it waits for the reception of 32 bytes of data to be 
completed. After the reception is completed, the serial port prints the log, 
and 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0引出到CH340，USB线接电脑，接上P12跳帽，将串口2引出到232。
2. 编译下载程序到MCU，并运行。
3. UART2通过232中断输出字符串“Hello DPM32. Received, please reply”。
4. 输出完成后等待接收32字节，完成后打印字符串“UART receive successfully!”。
5. LED1每隔1s翻转一次。

Example execution steps:
1. Connect the jumper cap on P10, connect serial port 0 to CH340, connect the USB 
cable to the computer, connect the P12 jumper cap, and connect serial port 2 to 232.
2. Compile and download the program to MCU, and run it.
3. UART2 outputs the string "Hello DPM32" through a 232 interrupt Received, please 
reply.
4. After the output is completed, wait for 32 bytes to be received. After completion, 
print the string "UART receive successfully!".
5. LED1 flips every 1 second.
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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
UART2_Tx   -> PC4
UART2_Rx   -> PC5

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

The UART pins are as follows:
UART0-Tx   -> PA9
UART0-Rx   -> PA10
UART2_Tx   -> PC4
UART2_Rx   -> PC5
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