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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USART的自动波特率检测功能,上位机发送1字节的波特率检测字符0x55，如果
MCU检测成功，则返回字符：Auto BaudRate Test。

Function descriptions:
This example demonstrates the automatic baud rate detection function of USART.
If the MCU detects successfully after the upper computer sends 1 byte baud rate
detection character 0x55, it will returns the string: Auto BaudRate Test.
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测试环境：
测试用板：PY32M031_STK
MDK版本： 5.28
IAR版本： 9.20
GCC 版本：GNU Arm Embedded Toolchain 10.3-2021.10

Test environment:
Test board: PY32M031_STK
MDK Version: 5.28
IAR Version: 9.20
GCC Version: GNU Arm Embedded Toolchain 10.3-2021.10
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使用步骤：
1. 编译并下载程序到MCU；
2. 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
PA02(TX) --> RX
PA03(RX) --> TX
GND      --> GND
3. PC端打开串口调试助手，正确连接上通讯COM口，
   波特率设置为9600，1位停止位，8位数据位，无奇偶校验。
4. 调试助手发送一个字符0x55，MCU反馈字符串：Auto BaudRate Test；

Example execution steps:
1. compile and download the program to MCU and run it;
2. Connect PC and STK board through USB to TTL module and the connection method
is as follows
STK board    USB to TTL moudle
PA02(TX) --> RX
PA03(RX) --> TX
GND      --> GND
3. Open the serial port Assistant on the PC, connect the COM port correctly, and
set the baud rate to 9600,1 stop bit, and 8 data bit ,without parity check.
4. Send a character 0x55 using the serial assistant. The MCU will return the 
string "Auto BaudRate Test".
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注意事项：

Notes:

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