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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UART0 DMA发送接收功能，复位UART0 DMA发送字符串“UART DMA receive and 
transmit example, please input 10 bytes:\r\n”，发送完成后，等待DMA接收10字节完成，
接收完成将收到的数据打印出来，LED1每隔1s翻转一次。

Function descriptions:
This example demonstrates the UART0 DMA sending and receiving function, resetting 
the UART0 DMA sending string "UART DMA receive and transmit example, please input
10 bytes: \ r \ n". After sending, wait for the DMA to receive 10 bytes, After 
receiving, print out the received data and flip LED1 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。
2. 编译下载程序到MCU，并运行。
3. 串口0 DMA输出字符串“UART DMA receive and transmit example, please input 10 bytes”。
4. 等待串口0 DMA接收10字节数据，完成后打印到串口0。
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, and connect 
the USB cable to the computer.
2. Compile and download the program to MCU, and run it.
3. Serial port 0 DMA output string "UART DMA receive and transmit example, please 
input 10 bytes".
4. Wait for the serial port 0 DMA to receive 10 bytes of data, and print it to the 
serial port 0 after completion.
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

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

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